Update to tengo v2 (#976)

22 files changed, 0 insertions, 5808 deletions

diff --git a/vendor/github.com/d5/tengo/stdlib/base64.go b/vendor/github.com/d5/tengo/stdlib/base64.go
deleted file mode 100644
index 40a746ce..00000000
--- a/vendor/github.com/d5/tengo/stdlib/base64.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package stdlib
-
-import (
-	"encoding/base64"
-	"github.com/d5/tengo/objects"
-)
-
-var base64Module = map[string]objects.Object{
-	"encode": &objects.UserFunction{Value: FuncAYRS(base64.StdEncoding.EncodeToString)},
-	"decode": &objects.UserFunction{Value: FuncASRYE(base64.StdEncoding.DecodeString)},
-
-	"raw_encode": &objects.UserFunction{Value: FuncAYRS(base64.RawStdEncoding.EncodeToString)},
-	"raw_decode": &objects.UserFunction{Value: FuncASRYE(base64.RawStdEncoding.DecodeString)},
-
-	"url_encode": &objects.UserFunction{Value: FuncAYRS(base64.URLEncoding.EncodeToString)},
-	"url_decode": &objects.UserFunction{Value: FuncASRYE(base64.URLEncoding.DecodeString)},
-
-	"raw_url_encode": &objects.UserFunction{Value: FuncAYRS(base64.RawURLEncoding.EncodeToString)},
-	"raw_url_decode": &objects.UserFunction{Value: FuncASRYE(base64.RawURLEncoding.DecodeString)},
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/builtin_modules.go b/vendor/github.com/d5/tengo/stdlib/builtin_modules.go
deleted file mode 100644
index 722461b2..00000000
--- a/vendor/github.com/d5/tengo/stdlib/builtin_modules.go
+++ /dev/null
@@ -1,16 +0,0 @@
-package stdlib
-
-import "github.com/d5/tengo/objects"
-
-// BuiltinModules are builtin type standard library modules.
-var BuiltinModules = map[string]map[string]objects.Object{
-	"math":  mathModule,
-	"os":    osModule,
-	"text":  textModule,
-	"times": timesModule,
-	"rand":  randModule,
-	"fmt":   fmtModule,
-	"json":  jsonModule,
-	"base64": base64Module,
-	"hex":  hexModule,
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/errors.go b/vendor/github.com/d5/tengo/stdlib/errors.go
deleted file mode 100644
index a2942bb0..00000000
--- a/vendor/github.com/d5/tengo/stdlib/errors.go
+++ /dev/null
@@ -1,11 +0,0 @@
-package stdlib
-
-import "github.com/d5/tengo/objects"
-
-func wrapError(err error) objects.Object {
-	if err == nil {
-		return objects.TrueValue
-	}
-
-	return &objects.Error{Value: &objects.String{Value: err.Error()}}
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/fmt.go b/vendor/github.com/d5/tengo/stdlib/fmt.go
deleted file mode 100644
index b8f64278..00000000
--- a/vendor/github.com/d5/tengo/stdlib/fmt.go
+++ /dev/null
@@ -1,110 +0,0 @@
-package stdlib
-
-import (
-	"fmt"
-
-	"github.com/d5/tengo"
-	"github.com/d5/tengo/objects"
-)
-
-var fmtModule = map[string]objects.Object{
-	"print":   &objects.UserFunction{Name: "print", Value: fmtPrint},
-	"printf":  &objects.UserFunction{Name: "printf", Value: fmtPrintf},
-	"println": &objects.UserFunction{Name: "println", Value: fmtPrintln},
-	"sprintf": &objects.UserFunction{Name: "sprintf", Value: fmtSprintf},
-}
-
-func fmtPrint(args ...objects.Object) (ret objects.Object, err error) {
-	printArgs, err := getPrintArgs(args...)
-	if err != nil {
-		return nil, err
-	}
-
-	_, _ = fmt.Print(printArgs...)
-
-	return nil, nil
-}
-
-func fmtPrintf(args ...objects.Object) (ret objects.Object, err error) {
-	numArgs := len(args)
-	if numArgs == 0 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	format, ok := args[0].(*objects.String)
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "format",
-			Expected: "string",
-			Found:    args[0].TypeName(),
-		}
-	}
-	if numArgs == 1 {
-		fmt.Print(format)
-		return nil, nil
-	}
-
-	s, err := objects.Format(format.Value, args[1:]...)
-	if err != nil {
-		return nil, err
-	}
-
-	fmt.Print(s)
-
-	return nil, nil
-}
-
-func fmtPrintln(args ...objects.Object) (ret objects.Object, err error) {
-	printArgs, err := getPrintArgs(args...)
-	if err != nil {
-		return nil, err
-	}
-
-	printArgs = append(printArgs, "\n")
-	_, _ = fmt.Print(printArgs...)
-
-	return nil, nil
-}
-
-func fmtSprintf(args ...objects.Object) (ret objects.Object, err error) {
-	numArgs := len(args)
-	if numArgs == 0 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	format, ok := args[0].(*objects.String)
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "format",
-			Expected: "string",
-			Found:    args[0].TypeName(),
-		}
-	}
-	if numArgs == 1 {
-		return format, nil // okay to return 'format' directly as String is immutable
-	}
-
-	s, err := objects.Format(format.Value, args[1:]...)
-	if err != nil {
-		return nil, err
-	}
-
-	return &objects.String{Value: s}, nil
-}
-
-func getPrintArgs(args ...objects.Object) ([]interface{}, error) {
-	var printArgs []interface{}
-	l := 0
-	for _, arg := range args {
-		s, _ := objects.ToString(arg)
-		slen := len(s)
-		if l+slen > tengo.MaxStringLen { // make sure length does not exceed the limit
-			return nil, objects.ErrStringLimit
-		}
-		l += slen
-
-		printArgs = append(printArgs, s)
-	}
-
-	return printArgs, nil
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/func_typedefs.go b/vendor/github.com/d5/tengo/stdlib/func_typedefs.go
deleted file mode 100644
index c7bd11fa..00000000
--- a/vendor/github.com/d5/tengo/stdlib/func_typedefs.go
+++ /dev/null
@@ -1,1178 +0,0 @@
-package stdlib
-
-import (
-	"fmt"
-
-	"github.com/d5/tengo"
-	"github.com/d5/tengo/objects"
-)
-
-// FuncAR transform a function of 'func()' signature
-// into CallableFunc type.
-func FuncAR(fn func()) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		fn()
-
-		return objects.UndefinedValue, nil
-	}
-}
-
-// FuncARI transform a function of 'func() int' signature
-// into CallableFunc type.
-func FuncARI(fn func() int) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		return &objects.Int{Value: int64(fn())}, nil
-	}
-}
-
-// FuncARI64 transform a function of 'func() int64' signature
-// into CallableFunc type.
-func FuncARI64(fn func() int64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		return &objects.Int{Value: fn()}, nil
-	}
-}
-
-// FuncAI64RI64 transform a function of 'func(int64) int64' signature
-// into CallableFunc type.
-func FuncAI64RI64(fn func(int64) int64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		return &objects.Int{Value: fn(i1)}, nil
-	}
-}
-
-// FuncAI64R transform a function of 'func(int64)' signature
-// into CallableFunc type.
-func FuncAI64R(fn func(int64)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		fn(i1)
-
-		return objects.UndefinedValue, nil
-	}
-}
-
-// FuncARB transform a function of 'func() bool' signature
-// into CallableFunc type.
-func FuncARB(fn func() bool) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		if fn() {
-			return objects.TrueValue, nil
-		}
-
-		return objects.FalseValue, nil
-	}
-}
-
-// FuncARE transform a function of 'func() error' signature
-// into CallableFunc type.
-func FuncARE(fn func() error) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		return wrapError(fn()), nil
-	}
-}
-
-// FuncARS transform a function of 'func() string' signature
-// into CallableFunc type.
-func FuncARS(fn func() string) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s := fn()
-
-		if len(s) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: s}, nil
-	}
-}
-
-// FuncARSE transform a function of 'func() (string, error)' signature
-// into CallableFunc type.
-func FuncARSE(fn func() (string, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		res, err := fn()
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		if len(res) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: res}, nil
-	}
-}
-
-// FuncARYE transform a function of 'func() ([]byte, error)' signature
-// into CallableFunc type.
-func FuncARYE(fn func() ([]byte, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		res, err := fn()
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		if len(res) > tengo.MaxBytesLen {
-			return nil, objects.ErrBytesLimit
-		}
-
-		return &objects.Bytes{Value: res}, nil
-	}
-}
-
-// FuncARF transform a function of 'func() float64' signature
-// into CallableFunc type.
-func FuncARF(fn func() float64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		return &objects.Float{Value: fn()}, nil
-	}
-}
-
-// FuncARSs transform a function of 'func() []string' signature
-// into CallableFunc type.
-func FuncARSs(fn func() []string) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		arr := &objects.Array{}
-		for _, elem := range fn() {
-			if len(elem) > tengo.MaxStringLen {
-				return nil, objects.ErrStringLimit
-			}
-
-			arr.Value = append(arr.Value, &objects.String{Value: elem})
-		}
-
-		return arr, nil
-	}
-}
-
-// FuncARIsE transform a function of 'func() ([]int, error)' signature
-// into CallableFunc type.
-func FuncARIsE(fn func() ([]int, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 0 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		res, err := fn()
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		arr := &objects.Array{}
-		for _, v := range res {
-			arr.Value = append(arr.Value, &objects.Int{Value: int64(v)})
-		}
-
-		return arr, nil
-	}
-}
-
-// FuncAIRIs transform a function of 'func(int) []int' signature
-// into CallableFunc type.
-func FuncAIRIs(fn func(int) []int) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res := fn(i1)
-
-		arr := &objects.Array{}
-		for _, v := range res {
-			arr.Value = append(arr.Value, &objects.Int{Value: int64(v)})
-		}
-
-		return arr, nil
-	}
-}
-
-// FuncAFRF transform a function of 'func(float64) float64' signature
-// into CallableFunc type.
-func FuncAFRF(fn func(float64) float64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		f1, ok := objects.ToFloat64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "float(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		return &objects.Float{Value: fn(f1)}, nil
-	}
-}
-
-// FuncAIR transform a function of 'func(int)' signature
-// into CallableFunc type.
-func FuncAIR(fn func(int)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		fn(i1)
-
-		return objects.UndefinedValue, nil
-	}
-}
-
-// FuncAIRF transform a function of 'func(int) float64' signature
-// into CallableFunc type.
-func FuncAIRF(fn func(int) float64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		return &objects.Float{Value: fn(i1)}, nil
-	}
-}
-
-// FuncAFRI transform a function of 'func(float64) int' signature
-// into CallableFunc type.
-func FuncAFRI(fn func(float64) int) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		f1, ok := objects.ToFloat64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "float(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		return &objects.Int{Value: int64(fn(f1))}, nil
-	}
-}
-
-// FuncAFFRF transform a function of 'func(float64, float64) float64' signature
-// into CallableFunc type.
-func FuncAFFRF(fn func(float64, float64) float64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		f1, ok := objects.ToFloat64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "float(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		f2, ok := objects.ToFloat64(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "float(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		return &objects.Float{Value: fn(f1, f2)}, nil
-	}
-}
-
-// FuncAIFRF transform a function of 'func(int, float64) float64' signature
-// into CallableFunc type.
-func FuncAIFRF(fn func(int, float64) float64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		f2, ok := objects.ToFloat64(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "float(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		return &objects.Float{Value: fn(i1, f2)}, nil
-	}
-}
-
-// FuncAFIRF transform a function of 'func(float64, int) float64' signature
-// into CallableFunc type.
-func FuncAFIRF(fn func(float64, int) float64) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		f1, ok := objects.ToFloat64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "float(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		i2, ok := objects.ToInt(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "int(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		return &objects.Float{Value: fn(f1, i2)}, nil
-	}
-}
-
-// FuncAFIRB transform a function of 'func(float64, int) bool' signature
-// into CallableFunc type.
-func FuncAFIRB(fn func(float64, int) bool) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		f1, ok := objects.ToFloat64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "float(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		i2, ok := objects.ToInt(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "int(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		if fn(f1, i2) {
-			return objects.TrueValue, nil
-		}
-
-		return objects.FalseValue, nil
-	}
-}
-
-// FuncAFRB transform a function of 'func(float64) bool' signature
-// into CallableFunc type.
-func FuncAFRB(fn func(float64) bool) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		f1, ok := objects.ToFloat64(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "float(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		if fn(f1) {
-			return objects.TrueValue, nil
-		}
-
-		return objects.FalseValue, nil
-	}
-}
-
-// FuncASRS transform a function of 'func(string) string' signature into CallableFunc type.
-// User function will return 'true' if underlying native function returns nil.
-func FuncASRS(fn func(string) string) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s := fn(s1)
-
-		if len(s) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: s}, nil
-	}
-}
-
-// FuncASRSs transform a function of 'func(string) []string' signature into CallableFunc type.
-func FuncASRSs(fn func(string) []string) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res := fn(s1)
-
-		arr := &objects.Array{}
-		for _, elem := range res {
-			if len(elem) > tengo.MaxStringLen {
-				return nil, objects.ErrStringLimit
-			}
-
-			arr.Value = append(arr.Value, &objects.String{Value: elem})
-		}
-
-		return arr, nil
-	}
-}
-
-// FuncASRSE transform a function of 'func(string) (string, error)' signature into CallableFunc type.
-// User function will return 'true' if underlying native function returns nil.
-func FuncASRSE(fn func(string) (string, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res, err := fn(s1)
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		if len(res) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: res}, nil
-	}
-}
-
-// FuncASRE transform a function of 'func(string) error' signature into CallableFunc type.
-// User function will return 'true' if underlying native function returns nil.
-func FuncASRE(fn func(string) error) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		return wrapError(fn(s1)), nil
-	}
-}
-
-// FuncASSRE transform a function of 'func(string, string) error' signature into CallableFunc type.
-// User function will return 'true' if underlying native function returns nil.
-func FuncASSRE(fn func(string, string) error) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s2, ok := objects.ToString(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "string(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		return wrapError(fn(s1, s2)), nil
-	}
-}
-
-// FuncASSRSs transform a function of 'func(string, string) []string' signature into CallableFunc type.
-func FuncASSRSs(fn func(string, string) []string) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s2, ok := objects.ToString(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		arr := &objects.Array{}
-		for _, res := range fn(s1, s2) {
-			if len(res) > tengo.MaxStringLen {
-				return nil, objects.ErrStringLimit
-			}
-
-			arr.Value = append(arr.Value, &objects.String{Value: res})
-		}
-
-		return arr, nil
-	}
-}
-
-// FuncASSIRSs transform a function of 'func(string, string, int) []string' signature into CallableFunc type.
-func FuncASSIRSs(fn func(string, string, int) []string) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 3 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s2, ok := objects.ToString(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "string(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		i3, ok := objects.ToInt(args[2])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "third",
-				Expected: "int(compatible)",
-				Found:    args[2].TypeName(),
-			}
-		}
-
-		arr := &objects.Array{}
-		for _, res := range fn(s1, s2, i3) {
-			if len(res) > tengo.MaxStringLen {
-				return nil, objects.ErrStringLimit
-			}
-
-			arr.Value = append(arr.Value, &objects.String{Value: res})
-		}
-
-		return arr, nil
-	}
-}
-
-// FuncASSRI transform a function of 'func(string, string) int' signature into CallableFunc type.
-func FuncASSRI(fn func(string, string) int) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s2, ok := objects.ToString(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		return &objects.Int{Value: int64(fn(s1, s2))}, nil
-	}
-}
-
-// FuncASSRS transform a function of 'func(string, string) string' signature into CallableFunc type.
-func FuncASSRS(fn func(string, string) string) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s2, ok := objects.ToString(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "string(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		s := fn(s1, s2)
-
-		if len(s) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: s}, nil
-	}
-}
-
-// FuncASSRB transform a function of 'func(string, string) bool' signature into CallableFunc type.
-func FuncASSRB(fn func(string, string) bool) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s2, ok := objects.ToString(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "string(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		if fn(s1, s2) {
-			return objects.TrueValue, nil
-		}
-
-		return objects.FalseValue, nil
-	}
-}
-
-// FuncASsSRS transform a function of 'func([]string, string) string' signature into CallableFunc type.
-func FuncASsSRS(fn func([]string, string) string) objects.CallableFunc {
-	return func(args ...objects.Object) (objects.Object, error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		var ss1 []string
-		switch arg0 := args[0].(type) {
-		case *objects.Array:
-			for idx, a := range arg0.Value {
-				as, ok := objects.ToString(a)
-				if !ok {
-					return nil, objects.ErrInvalidArgumentType{
-						Name:     fmt.Sprintf("first[%d]", idx),
-						Expected: "string(compatible)",
-						Found:    a.TypeName(),
-					}
-				}
-				ss1 = append(ss1, as)
-			}
-		case *objects.ImmutableArray:
-			for idx, a := range arg0.Value {
-				as, ok := objects.ToString(a)
-				if !ok {
-					return nil, objects.ErrInvalidArgumentType{
-						Name:     fmt.Sprintf("first[%d]", idx),
-						Expected: "string(compatible)",
-						Found:    a.TypeName(),
-					}
-				}
-				ss1 = append(ss1, as)
-			}
-		default:
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "array",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s2, ok := objects.ToString(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "string(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		s := fn(ss1, s2)
-		if len(s) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: s}, nil
-	}
-}
-
-// FuncASI64RE transform a function of 'func(string, int64) error' signature
-// into CallableFunc type.
-func FuncASI64RE(fn func(string, int64) error) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		i2, ok := objects.ToInt64(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "int(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		return wrapError(fn(s1, i2)), nil
-	}
-}
-
-// FuncAIIRE transform a function of 'func(int, int) error' signature
-// into CallableFunc type.
-func FuncAIIRE(fn func(int, int) error) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		i2, ok := objects.ToInt(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "int(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		return wrapError(fn(i1, i2)), nil
-	}
-}
-
-// FuncASIRS transform a function of 'func(string, int) string' signature
-// into CallableFunc type.
-func FuncASIRS(fn func(string, int) string) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 2 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		i2, ok := objects.ToInt(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "int(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		s := fn(s1, i2)
-
-		if len(s) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: s}, nil
-	}
-}
-
-// FuncASIIRE transform a function of 'func(string, int, int) error' signature
-// into CallableFunc type.
-func FuncASIIRE(fn func(string, int, int) error) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 3 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		i2, ok := objects.ToInt(args[1])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "second",
-				Expected: "int(compatible)",
-				Found:    args[1].TypeName(),
-			}
-		}
-
-		i3, ok := objects.ToInt(args[2])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "third",
-				Expected: "int(compatible)",
-				Found:    args[2].TypeName(),
-			}
-		}
-
-		return wrapError(fn(s1, i2, i3)), nil
-	}
-}
-
-// FuncAYRIE transform a function of 'func([]byte) (int, error)' signature
-// into CallableFunc type.
-func FuncAYRIE(fn func([]byte) (int, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		y1, ok := objects.ToByteSlice(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "bytes(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res, err := fn(y1)
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		return &objects.Int{Value: int64(res)}, nil
-	}
-}
-
-// FuncAYRS transform a function of 'func([]byte) string' signature
-// into CallableFunc type.
-func FuncAYRS(fn func([]byte) string) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		y1, ok := objects.ToByteSlice(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "bytes(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res := fn(y1)
-
-		return &objects.String{Value: res}, nil
-	}
-}
-
-// FuncASRIE transform a function of 'func(string) (int, error)' signature
-// into CallableFunc type.
-func FuncASRIE(fn func(string) (int, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res, err := fn(s1)
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		return &objects.Int{Value: int64(res)}, nil
-	}
-}
-
-// FuncASRYE transform a function of 'func(string) ([]byte, error)' signature
-// into CallableFunc type.
-func FuncASRYE(fn func(string) ([]byte, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		s1, ok := objects.ToString(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "string(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res, err := fn(s1)
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		if len(res) > tengo.MaxBytesLen {
-			return nil, objects.ErrBytesLimit
-		}
-
-		return &objects.Bytes{Value: res}, nil
-	}
-}
-
-// FuncAIRSsE transform a function of 'func(int) ([]string, error)' signature
-// into CallableFunc type.
-func FuncAIRSsE(fn func(int) ([]string, error)) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		res, err := fn(i1)
-		if err != nil {
-			return wrapError(err), nil
-		}
-
-		arr := &objects.Array{}
-		for _, r := range res {
-			if len(r) > tengo.MaxStringLen {
-				return nil, objects.ErrStringLimit
-			}
-
-			arr.Value = append(arr.Value, &objects.String{Value: r})
-		}
-
-		return arr, nil
-	}
-}
-
-// FuncAIRS transform a function of 'func(int) string' signature
-// into CallableFunc type.
-func FuncAIRS(fn func(int) string) objects.CallableFunc {
-	return func(args ...objects.Object) (ret objects.Object, err error) {
-		if len(args) != 1 {
-			return nil, objects.ErrWrongNumArguments
-		}
-
-		i1, ok := objects.ToInt(args[0])
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     "first",
-				Expected: "int(compatible)",
-				Found:    args[0].TypeName(),
-			}
-		}
-
-		s := fn(i1)
-
-		if len(s) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		return &objects.String{Value: s}, nil
-	}
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/hex.go b/vendor/github.com/d5/tengo/stdlib/hex.go
deleted file mode 100644
index acc29e6a..00000000
--- a/vendor/github.com/d5/tengo/stdlib/hex.go
+++ /dev/null
@@ -1,11 +0,0 @@
-package stdlib
-
-import (
-	"encoding/hex"
-	"github.com/d5/tengo/objects"
-)
-
-var hexModule = map[string]objects.Object{
-	"encode": &objects.UserFunction{Value: FuncAYRS(hex.EncodeToString)},
-	"decode": &objects.UserFunction{Value: FuncASRYE(hex.DecodeString)},
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/json.go b/vendor/github.com/d5/tengo/stdlib/json.go
deleted file mode 100644
index f913dc48..00000000
--- a/vendor/github.com/d5/tengo/stdlib/json.go
+++ /dev/null
@@ -1,126 +0,0 @@
-package stdlib
-
-import (
-	"bytes"
-	gojson "encoding/json"
-
-	"github.com/d5/tengo/objects"
-	"github.com/d5/tengo/stdlib/json"
-)
-
-var jsonModule = map[string]objects.Object{
-	"decode":      &objects.UserFunction{Name: "decode", Value: jsonDecode},
-	"encode":      &objects.UserFunction{Name: "encode", Value: jsonEncode},
-	"indent":      &objects.UserFunction{Name: "encode", Value: jsonIndent},
-	"html_escape": &objects.UserFunction{Name: "html_escape", Value: jsonHTMLEscape},
-}
-
-func jsonDecode(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	switch o := args[0].(type) {
-	case *objects.Bytes:
-		v, err := json.Decode(o.Value)
-		if err != nil {
-			return &objects.Error{Value: &objects.String{Value: err.Error()}}, nil
-		}
-		return v, nil
-	case *objects.String:
-		v, err := json.Decode([]byte(o.Value))
-		if err != nil {
-			return &objects.Error{Value: &objects.String{Value: err.Error()}}, nil
-		}
-		return v, nil
-	default:
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "bytes/string",
-			Found:    args[0].TypeName(),
-		}
-	}
-}
-
-func jsonEncode(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	b, err := json.Encode(args[0])
-	if err != nil {
-		return &objects.Error{Value: &objects.String{Value: err.Error()}}, nil
-	}
-
-	return &objects.Bytes{Value: b}, nil
-}
-
-func jsonIndent(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 3 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	prefix, ok := objects.ToString(args[1])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "prefix",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-	}
-
-	indent, ok := objects.ToString(args[2])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "indent",
-			Expected: "string(compatible)",
-			Found:    args[2].TypeName(),
-		}
-	}
-
-	switch o := args[0].(type) {
-	case *objects.Bytes:
-		var dst bytes.Buffer
-		err := gojson.Indent(&dst, o.Value, prefix, indent)
-		if err != nil {
-			return &objects.Error{Value: &objects.String{Value: err.Error()}}, nil
-		}
-		return &objects.Bytes{Value: dst.Bytes()}, nil
-	case *objects.String:
-		var dst bytes.Buffer
-		err := gojson.Indent(&dst, []byte(o.Value), prefix, indent)
-		if err != nil {
-			return &objects.Error{Value: &objects.String{Value: err.Error()}}, nil
-		}
-		return &objects.Bytes{Value: dst.Bytes()}, nil
-	default:
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "bytes/string",
-			Found:    args[0].TypeName(),
-		}
-	}
-}
-
-func jsonHTMLEscape(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	switch o := args[0].(type) {
-	case *objects.Bytes:
-		var dst bytes.Buffer
-		gojson.HTMLEscape(&dst, o.Value)
-		return &objects.Bytes{Value: dst.Bytes()}, nil
-	case *objects.String:
-		var dst bytes.Buffer
-		gojson.HTMLEscape(&dst, []byte(o.Value))
-		return &objects.Bytes{Value: dst.Bytes()}, nil
-	default:
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "bytes/string",
-			Found:    args[0].TypeName(),
-		}
-	}
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/json/decode.go b/vendor/github.com/d5/tengo/stdlib/json/decode.go
deleted file mode 100644
index 5a3fe6c7..00000000
--- a/vendor/github.com/d5/tengo/stdlib/json/decode.go
+++ /dev/null
@@ -1,374 +0,0 @@
-// A modified version of Go's JSON implementation.
-
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package json
-
-import (
-	"strconv"
-	"unicode"
-	"unicode/utf16"
-	"unicode/utf8"
-
-	"github.com/d5/tengo/objects"
-)
-
-// Decode parses the JSON-encoded data and returns the result object.
-func Decode(data []byte) (objects.Object, error) {
-	var d decodeState
-	err := checkValid(data, &d.scan)
-	if err != nil {
-		return nil, err
-	}
-
-	d.init(data)
-	d.scan.reset()
-	d.scanWhile(scanSkipSpace)
-
-	return d.value()
-}
-
-// decodeState represents the state while decoding a JSON value.
-type decodeState struct {
-	data   []byte
-	off    int // next read offset in data
-	opcode int // last read result
-	scan   scanner
-}
-
-// readIndex returns the position of the last byte read.
-func (d *decodeState) readIndex() int {
-	return d.off - 1
-}
-
-const phasePanicMsg = "JSON decoder out of sync - data changing underfoot?"
-
-func (d *decodeState) init(data []byte) *decodeState {
-	d.data = data
-	d.off = 0
-	return d
-}
-
-// scanNext processes the byte at d.data[d.off].
-func (d *decodeState) scanNext() {
-	if d.off < len(d.data) {
-		d.opcode = d.scan.step(&d.scan, d.data[d.off])
-		d.off++
-	} else {
-		d.opcode = d.scan.eof()
-		d.off = len(d.data) + 1 // mark processed EOF with len+1
-	}
-}
-
-// scanWhile processes bytes in d.data[d.off:] until it
-// receives a scan code not equal to op.
-func (d *decodeState) scanWhile(op int) {
-	s, data, i := &d.scan, d.data, d.off
-	for i < len(data) {
-		newOp := s.step(s, data[i])
-		i++
-		if newOp != op {
-			d.opcode = newOp
-			d.off = i
-			return
-		}
-	}
-
-	d.off = len(data) + 1 // mark processed EOF with len+1
-	d.opcode = d.scan.eof()
-}
-
-func (d *decodeState) value() (objects.Object, error) {
-	switch d.opcode {
-	default:
-		panic(phasePanicMsg)
-
-	case scanBeginArray:
-		o, err := d.array()
-		if err != nil {
-			return nil, err
-		}
-
-		d.scanNext()
-
-		return o, nil
-
-	case scanBeginObject:
-		o, err := d.object()
-		if err != nil {
-			return nil, err
-		}
-
-		d.scanNext()
-
-		return o, nil
-
-	case scanBeginLiteral:
-		return d.literal()
-	}
-}
-
-func (d *decodeState) array() (objects.Object, error) {
-	var arr []objects.Object
-	for {
-		// Look ahead for ] - can only happen on first iteration.
-		d.scanWhile(scanSkipSpace)
-		if d.opcode == scanEndArray {
-			break
-		}
-
-		o, err := d.value()
-		if err != nil {
-			return nil, err
-		}
-		arr = append(arr, o)
-
-		// Next token must be , or ].
-		if d.opcode == scanSkipSpace {
-			d.scanWhile(scanSkipSpace)
-		}
-		if d.opcode == scanEndArray {
-			break
-		}
-		if d.opcode != scanArrayValue {
-			panic(phasePanicMsg)
-		}
-	}
-
-	return &objects.Array{Value: arr}, nil
-}
-
-func (d *decodeState) object() (objects.Object, error) {
-	m := make(map[string]objects.Object)
-	for {
-		// Read opening " of string key or closing }.
-		d.scanWhile(scanSkipSpace)
-		if d.opcode == scanEndObject {
-			// closing } - can only happen on first iteration.
-			break
-		}
-		if d.opcode != scanBeginLiteral {
-			panic(phasePanicMsg)
-		}
-
-		// Read string key.
-		start := d.readIndex()
-		d.scanWhile(scanContinue)
-		item := d.data[start:d.readIndex()]
-		key, ok := unquote(item)
-		if !ok {
-			panic(phasePanicMsg)
-		}
-
-		// Read : before value.
-		if d.opcode == scanSkipSpace {
-			d.scanWhile(scanSkipSpace)
-		}
-		if d.opcode != scanObjectKey {
-			panic(phasePanicMsg)
-		}
-		d.scanWhile(scanSkipSpace)
-
-		// Read value.
-		o, err := d.value()
-		if err != nil {
-			return nil, err
-		}
-
-		m[key] = o
-
-		// Next token must be , or }.
-		if d.opcode == scanSkipSpace {
-			d.scanWhile(scanSkipSpace)
-		}
-		if d.opcode == scanEndObject {
-			break
-		}
-		if d.opcode != scanObjectValue {
-			panic(phasePanicMsg)
-		}
-	}
-
-	return &objects.Map{Value: m}, nil
-}
-
-func (d *decodeState) literal() (objects.Object, error) {
-	// All bytes inside literal return scanContinue op code.
-	start := d.readIndex()
-	d.scanWhile(scanContinue)
-
-	item := d.data[start:d.readIndex()]
-
-	switch c := item[0]; c {
-	case 'n': // null
-		return objects.UndefinedValue, nil
-
-	case 't', 'f': // true, false
-		if c == 't' {
-			return objects.TrueValue, nil
-		}
-		return objects.FalseValue, nil
-
-	case '"': // string
-		s, ok := unquote(item)
-		if !ok {
-			panic(phasePanicMsg)
-		}
-		return &objects.String{Value: s}, nil
-
-	default: // number
-		if c != '-' && (c < '0' || c > '9') {
-			panic(phasePanicMsg)
-		}
-
-		n, _ := strconv.ParseFloat(string(item), 10)
-		return &objects.Float{Value: n}, nil
-	}
-}
-
-// getu4 decodes \uXXXX from the beginning of s, returning the hex value,
-// or it returns -1.
-func getu4(s []byte) rune {
-	if len(s) < 6 || s[0] != '\\' || s[1] != 'u' {
-		return -1
-	}
-	var r rune
-	for _, c := range s[2:6] {
-		switch {
-		case '0' <= c && c <= '9':
-			c = c - '0'
-		case 'a' <= c && c <= 'f':
-			c = c - 'a' + 10
-		case 'A' <= c && c <= 'F':
-			c = c - 'A' + 10
-		default:
-			return -1
-		}
-		r = r*16 + rune(c)
-	}
-	return r
-}
-
-// unquote converts a quoted JSON string literal s into an actual string t.
-// The rules are different than for Go, so cannot use strconv.Unquote.
-func unquote(s []byte) (t string, ok bool) {
-	s, ok = unquoteBytes(s)
-	t = string(s)
-	return
-}
-
-func unquoteBytes(s []byte) (t []byte, ok bool) {
-	if len(s) < 2 || s[0] != '"' || s[len(s)-1] != '"' {
-		return
-	}
-	s = s[1 : len(s)-1]
-
-	// Check for unusual characters. If there are none,
-	// then no unquoting is needed, so return a slice of the
-	// original bytes.
-	r := 0
-	for r < len(s) {
-		c := s[r]
-		if c == '\\' || c == '"' || c < ' ' {
-			break
-		}
-		if c < utf8.RuneSelf {
-			r++
-			continue
-		}
-		rr, size := utf8.DecodeRune(s[r:])
-		if rr == utf8.RuneError && size == 1 {
-			break
-		}
-		r += size
-	}
-	if r == len(s) {
-		return s, true
-	}
-
-	b := make([]byte, len(s)+2*utf8.UTFMax)
-	w := copy(b, s[0:r])
-	for r < len(s) {
-		// Out of room? Can only happen if s is full of
-		// malformed UTF-8 and we're replacing each
-		// byte with RuneError.
-		if w >= len(b)-2*utf8.UTFMax {
-			nb := make([]byte, (len(b)+utf8.UTFMax)*2)
-			copy(nb, b[0:w])
-			b = nb
-		}
-		switch c := s[r]; {
-		case c == '\\':
-			r++
-			if r >= len(s) {
-				return
-			}
-			switch s[r] {
-			default:
-				return
-			case '"', '\\', '/', '\'':
-				b[w] = s[r]
-				r++
-				w++
-			case 'b':
-				b[w] = '\b'
-				r++
-				w++
-			case 'f':
-				b[w] = '\f'
-				r++
-				w++
-			case 'n':
-				b[w] = '\n'
-				r++
-				w++
-			case 'r':
-				b[w] = '\r'
-				r++
-				w++
-			case 't':
-				b[w] = '\t'
-				r++
-				w++
-			case 'u':
-				r--
-				rr := getu4(s[r:])
-				if rr < 0 {
-					return
-				}
-				r += 6
-				if utf16.IsSurrogate(rr) {
-					rr1 := getu4(s[r:])
-					if dec := utf16.DecodeRune(rr, rr1); dec != unicode.ReplacementChar {
-						// A valid pair; consume.
-						r += 6
-						w += utf8.EncodeRune(b[w:], dec)
-						break
-					}
-					// Invalid surrogate; fall back to replacement rune.
-					rr = unicode.ReplacementChar
-				}
-				w += utf8.EncodeRune(b[w:], rr)
-			}
-
-		// Quote, control characters are invalid.
-		case c == '"', c < ' ':
-			return
-
-		// ASCII
-		case c < utf8.RuneSelf:
-			b[w] = c
-			r++
-			w++
-
-		// Coerce to well-formed UTF-8.
-		default:
-			rr, size := utf8.DecodeRune(s[r:])
-			r += size
-			w += utf8.EncodeRune(b[w:], rr)
-		}
-	}
-	return b[0:w], true
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/json/encode.go b/vendor/github.com/d5/tengo/stdlib/json/encode.go
deleted file mode 100644
index 2b8b17eb..00000000
--- a/vendor/github.com/d5/tengo/stdlib/json/encode.go
+++ /dev/null
@@ -1,147 +0,0 @@
-// A modified version of Go's JSON implementation.
-
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package json
-
-import (
-	"encoding/base64"
-	"errors"
-	"math"
-	"strconv"
-
-	"github.com/d5/tengo/objects"
-)
-
-// Encode returns the JSON encoding of the object.
-func Encode(o objects.Object) ([]byte, error) {
-	var b []byte
-
-	switch o := o.(type) {
-	case *objects.Array:
-		b = append(b, '[')
-		len1 := len(o.Value) - 1
-		for idx, elem := range o.Value {
-			eb, err := Encode(elem)
-			if err != nil {
-				return nil, err
-			}
-			b = append(b, eb...)
-			if idx < len1 {
-				b = append(b, ',')
-			}
-		}
-		b = append(b, ']')
-	case *objects.ImmutableArray:
-		b = append(b, '[')
-		len1 := len(o.Value) - 1
-		for idx, elem := range o.Value {
-			eb, err := Encode(elem)
-			if err != nil {
-				return nil, err
-			}
-			b = append(b, eb...)
-			if idx < len1 {
-				b = append(b, ',')
-			}
-		}
-		b = append(b, ']')
-	case *objects.Map:
-		b = append(b, '{')
-		len1 := len(o.Value) - 1
-		idx := 0
-		for key, value := range o.Value {
-			b = strconv.AppendQuote(b, key)
-			b = append(b, ':')
-			eb, err := Encode(value)
-			if err != nil {
-				return nil, err
-			}
-			b = append(b, eb...)
-			if idx < len1 {
-				b = append(b, ',')
-			}
-			idx++
-		}
-		b = append(b, '}')
-	case *objects.ImmutableMap:
-		b = append(b, '{')
-		len1 := len(o.Value) - 1
-		idx := 0
-		for key, value := range o.Value {
-			b = strconv.AppendQuote(b, key)
-			b = append(b, ':')
-			eb, err := Encode(value)
-			if err != nil {
-				return nil, err
-			}
-			b = append(b, eb...)
-			if idx < len1 {
-				b = append(b, ',')
-			}
-			idx++
-		}
-		b = append(b, '}')
-	case *objects.Bool:
-		if o.IsFalsy() {
-			b = strconv.AppendBool(b, false)
-		} else {
-			b = strconv.AppendBool(b, true)
-		}
-	case *objects.Bytes:
-		b = append(b, '"')
-		encodedLen := base64.StdEncoding.EncodedLen(len(o.Value))
-		dst := make([]byte, encodedLen)
-		base64.StdEncoding.Encode(dst, o.Value)
-		b = append(b, dst...)
-		b = append(b, '"')
-	case *objects.Char:
-		b = strconv.AppendInt(b, int64(o.Value), 10)
-	case *objects.Float:
-		var y []byte
-
-		f := o.Value
-		if math.IsInf(f, 0) || math.IsNaN(f) {
-			return nil, errors.New("unsupported float value")
-		}
-
-		// Convert as if by ES6 number to string conversion.
-		// This matches most other JSON generators.
-		abs := math.Abs(f)
-		fmt := byte('f')
-		if abs != 0 {
-			if abs < 1e-6 || abs >= 1e21 {
-				fmt = 'e'
-			}
-		}
-		y = strconv.AppendFloat(y, f, fmt, -1, 64)
-		if fmt == 'e' {
-			// clean up e-09 to e-9
-			n := len(y)
-			if n >= 4 && y[n-4] == 'e' && y[n-3] == '-' && y[n-2] == '0' {
-				y[n-2] = y[n-1]
-				y = y[:n-1]
-			}
-		}
-
-		b = append(b, y...)
-	case *objects.Int:
-		b = strconv.AppendInt(b, o.Value, 10)
-	case *objects.String:
-		b = strconv.AppendQuote(b, o.Value)
-	case *objects.Time:
-		y, err := o.Value.MarshalJSON()
-		if err != nil {
-			return nil, err
-		}
-		b = append(b, y...)
-	case *objects.Undefined:
-		b = append(b, "null"...)
-	default:
-		// unknown type: ignore
-	}
-
-	return b, nil
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/json/scanner.go b/vendor/github.com/d5/tengo/stdlib/json/scanner.go
deleted file mode 100644
index 8fc6776d..00000000
--- a/vendor/github.com/d5/tengo/stdlib/json/scanner.go
+++ /dev/null
@@ -1,559 +0,0 @@
-// A modified version of Go's JSON implementation.
-
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package json
-
-import "strconv"
-
-func checkValid(data []byte, scan *scanner) error {
-	scan.reset()
-	for _, c := range data {
-		scan.bytes++
-		if scan.step(scan, c) == scanError {
-			return scan.err
-		}
-	}
-	if scan.eof() == scanError {
-		return scan.err
-	}
-	return nil
-}
-
-// A SyntaxError is a description of a JSON syntax error.
-type SyntaxError struct {
-	msg    string // description of error
-	Offset int64  // error occurred after reading Offset bytes
-}
-
-func (e *SyntaxError) Error() string { return e.msg }
-
-// A scanner is a JSON scanning state machine.
-// Callers call scan.reset() and then pass bytes in one at a time
-// by calling scan.step(&scan, c) for each byte.
-// The return value, referred to as an opcode, tells the
-// caller about significant parsing events like beginning
-// and ending literals, objects, and arrays, so that the
-// caller can follow along if it wishes.
-// The return value scanEnd indicates that a single top-level
-// JSON value has been completed, *before* the byte that
-// just got passed in.  (The indication must be delayed in order
-// to recognize the end of numbers: is 123 a whole value or
-// the beginning of 12345e+6?).
-type scanner struct {
-	// The step is a func to be called to execute the next transition.
-	// Also tried using an integer constant and a single func
-	// with a switch, but using the func directly was 10% faster
-	// on a 64-bit Mac Mini, and it's nicer to read.
-	step func(*scanner, byte) int
-
-	// Reached end of top-level value.
-	endTop bool
-
-	// Stack of what we're in the middle of - array values, object keys, object values.
-	parseState []int
-
-	// Error that happened, if any.
-	err error
-
-	// total bytes consumed, updated by decoder.Decode
-	bytes int64
-}
-
-// These values are returned by the state transition functions
-// assigned to scanner.state and the method scanner.eof.
-// They give details about the current state of the scan that
-// callers might be interested to know about.
-// It is okay to ignore the return value of any particular
-// call to scanner.state: if one call returns scanError,
-// every subsequent call will return scanError too.
-const (
-	// Continue.
-	scanContinue     = iota // uninteresting byte
-	scanBeginLiteral        // end implied by next result != scanContinue
-	scanBeginObject         // begin object
-	scanObjectKey           // just finished object key (string)
-	scanObjectValue         // just finished non-last object value
-	scanEndObject           // end object (implies scanObjectValue if possible)
-	scanBeginArray          // begin array
-	scanArrayValue          // just finished array value
-	scanEndArray            // end array (implies scanArrayValue if possible)
-	scanSkipSpace           // space byte; can skip; known to be last "continue" result
-
-	// Stop.
-	scanEnd   // top-level value ended *before* this byte; known to be first "stop" result
-	scanError // hit an error, scanner.err.
-)
-
-// These values are stored in the parseState stack.
-// They give the current state of a composite value
-// being scanned. If the parser is inside a nested value
-// the parseState describes the nested state, outermost at entry 0.
-const (
-	parseObjectKey   = iota // parsing object key (before colon)
-	parseObjectValue        // parsing object value (after colon)
-	parseArrayValue         // parsing array value
-)
-
-// reset prepares the scanner for use.
-// It must be called before calling s.step.
-func (s *scanner) reset() {
-	s.step = stateBeginValue
-	s.parseState = s.parseState[0:0]
-	s.err = nil
-	s.endTop = false
-}
-
-// eof tells the scanner that the end of input has been reached.
-// It returns a scan status just as s.step does.
-func (s *scanner) eof() int {
-	if s.err != nil {
-		return scanError
-	}
-	if s.endTop {
-		return scanEnd
-	}
-	s.step(s, ' ')
-	if s.endTop {
-		return scanEnd
-	}
-	if s.err == nil {
-		s.err = &SyntaxError{"unexpected end of JSON input", s.bytes}
-	}
-	return scanError
-}
-
-// pushParseState pushes a new parse state p onto the parse stack.
-func (s *scanner) pushParseState(p int) {
-	s.parseState = append(s.parseState, p)
-}
-
-// popParseState pops a parse state (already obtained) off the stack
-// and updates s.step accordingly.
-func (s *scanner) popParseState() {
-	n := len(s.parseState) - 1
-	s.parseState = s.parseState[0:n]
-	if n == 0 {
-		s.step = stateEndTop
-		s.endTop = true
-	} else {
-		s.step = stateEndValue
-	}
-}
-
-func isSpace(c byte) bool {
-	return c == ' ' || c == '\t' || c == '\r' || c == '\n'
-}
-
-// stateBeginValueOrEmpty is the state after reading `[`.
-func stateBeginValueOrEmpty(s *scanner, c byte) int {
-	if c <= ' ' && isSpace(c) {
-		return scanSkipSpace
-	}
-	if c == ']' {
-		return stateEndValue(s, c)
-	}
-	return stateBeginValue(s, c)
-}
-
-// stateBeginValue is the state at the beginning of the input.
-func stateBeginValue(s *scanner, c byte) int {
-	if c <= ' ' && isSpace(c) {
-		return scanSkipSpace
-	}
-	switch c {
-	case '{':
-		s.step = stateBeginStringOrEmpty
-		s.pushParseState(parseObjectKey)
-		return scanBeginObject
-	case '[':
-		s.step = stateBeginValueOrEmpty
-		s.pushParseState(parseArrayValue)
-		return scanBeginArray
-	case '"':
-		s.step = stateInString
-		return scanBeginLiteral
-	case '-':
-		s.step = stateNeg
-		return scanBeginLiteral
-	case '0': // beginning of 0.123
-		s.step = state0
-		return scanBeginLiteral
-	case 't': // beginning of true
-		s.step = stateT
-		return scanBeginLiteral
-	case 'f': // beginning of false
-		s.step = stateF
-		return scanBeginLiteral
-	case 'n': // beginning of null
-		s.step = stateN
-		return scanBeginLiteral
-	}
-	if '1' <= c && c <= '9' { // beginning of 1234.5
-		s.step = state1
-		return scanBeginLiteral
-	}
-	return s.error(c, "looking for beginning of value")
-}
-
-// stateBeginStringOrEmpty is the state after reading `{`.
-func stateBeginStringOrEmpty(s *scanner, c byte) int {
-	if c <= ' ' && isSpace(c) {
-		return scanSkipSpace
-	}
-	if c == '}' {
-		n := len(s.parseState)
-		s.parseState[n-1] = parseObjectValue
-		return stateEndValue(s, c)
-	}
-	return stateBeginString(s, c)
-}
-
-// stateBeginString is the state after reading `{"key": value,`.
-func stateBeginString(s *scanner, c byte) int {
-	if c <= ' ' && isSpace(c) {
-		return scanSkipSpace
-	}
-	if c == '"' {
-		s.step = stateInString
-		return scanBeginLiteral
-	}
-	return s.error(c, "looking for beginning of object key string")
-}
-
-// stateEndValue is the state after completing a value,
-// such as after reading `{}` or `true` or `["x"`.
-func stateEndValue(s *scanner, c byte) int {
-	n := len(s.parseState)
-	if n == 0 {
-		// Completed top-level before the current byte.
-		s.step = stateEndTop
-		s.endTop = true
-		return stateEndTop(s, c)
-	}
-	if c <= ' ' && isSpace(c) {
-		s.step = stateEndValue
-		return scanSkipSpace
-	}
-	ps := s.parseState[n-1]
-	switch ps {
-	case parseObjectKey:
-		if c == ':' {
-			s.parseState[n-1] = parseObjectValue
-			s.step = stateBeginValue
-			return scanObjectKey
-		}
-		return s.error(c, "after object key")
-	case parseObjectValue:
-		if c == ',' {
-			s.parseState[n-1] = parseObjectKey
-			s.step = stateBeginString
-			return scanObjectValue
-		}
-		if c == '}' {
-			s.popParseState()
-			return scanEndObject
-		}
-		return s.error(c, "after object key:value pair")
-	case parseArrayValue:
-		if c == ',' {
-			s.step = stateBeginValue
-			return scanArrayValue
-		}
-		if c == ']' {
-			s.popParseState()
-			return scanEndArray
-		}
-		return s.error(c, "after array element")
-	}
-	return s.error(c, "")
-}
-
-// stateEndTop is the state after finishing the top-level value,
-// such as after reading `{}` or `[1,2,3]`.
-// Only space characters should be seen now.
-func stateEndTop(s *scanner, c byte) int {
-	if !isSpace(c) {
-		// Complain about non-space byte on next call.
-		s.error(c, "after top-level value")
-	}
-	return scanEnd
-}
-
-// stateInString is the state after reading `"`.
-func stateInString(s *scanner, c byte) int {
-	if c == '"' {
-		s.step = stateEndValue
-		return scanContinue
-	}
-	if c == '\\' {
-		s.step = stateInStringEsc
-		return scanContinue
-	}
-	if c < 0x20 {
-		return s.error(c, "in string literal")
-	}
-	return scanContinue
-}
-
-// stateInStringEsc is the state after reading `"\` during a quoted string.
-func stateInStringEsc(s *scanner, c byte) int {
-	switch c {
-	case 'b', 'f', 'n', 'r', 't', '\\', '/', '"':
-		s.step = stateInString
-		return scanContinue
-	case 'u':
-		s.step = stateInStringEscU
-		return scanContinue
-	}
-	return s.error(c, "in string escape code")
-}
-
-// stateInStringEscU is the state after reading `"\u` during a quoted string.
-func stateInStringEscU(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
-		s.step = stateInStringEscU1
-		return scanContinue
-	}
-	// numbers
-	return s.error(c, "in \\u hexadecimal character escape")
-}
-
-// stateInStringEscU1 is the state after reading `"\u1` during a quoted string.
-func stateInStringEscU1(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
-		s.step = stateInStringEscU12
-		return scanContinue
-	}
-	// numbers
-	return s.error(c, "in \\u hexadecimal character escape")
-}
-
-// stateInStringEscU12 is the state after reading `"\u12` during a quoted string.
-func stateInStringEscU12(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
-		s.step = stateInStringEscU123
-		return scanContinue
-	}
-	// numbers
-	return s.error(c, "in \\u hexadecimal character escape")
-}
-
-// stateInStringEscU123 is the state after reading `"\u123` during a quoted string.
-func stateInStringEscU123(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
-		s.step = stateInString
-		return scanContinue
-	}
-	// numbers
-	return s.error(c, "in \\u hexadecimal character escape")
-}
-
-// stateNeg is the state after reading `-` during a number.
-func stateNeg(s *scanner, c byte) int {
-	if c == '0' {
-		s.step = state0
-		return scanContinue
-	}
-	if '1' <= c && c <= '9' {
-		s.step = state1
-		return scanContinue
-	}
-	return s.error(c, "in numeric literal")
-}
-
-// state1 is the state after reading a non-zero integer during a number,
-// such as after reading `1` or `100` but not `0`.
-func state1(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' {
-		s.step = state1
-		return scanContinue
-	}
-	return state0(s, c)
-}
-
-// state0 is the state after reading `0` during a number.
-func state0(s *scanner, c byte) int {
-	if c == '.' {
-		s.step = stateDot
-		return scanContinue
-	}
-	if c == 'e' || c == 'E' {
-		s.step = stateE
-		return scanContinue
-	}
-	return stateEndValue(s, c)
-}
-
-// stateDot is the state after reading the integer and decimal point in a number,
-// such as after reading `1.`.
-func stateDot(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' {
-		s.step = stateDot0
-		return scanContinue
-	}
-	return s.error(c, "after decimal point in numeric literal")
-}
-
-// stateDot0 is the state after reading the integer, decimal point, and subsequent
-// digits of a number, such as after reading `3.14`.
-func stateDot0(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' {
-		return scanContinue
-	}
-	if c == 'e' || c == 'E' {
-		s.step = stateE
-		return scanContinue
-	}
-	return stateEndValue(s, c)
-}
-
-// stateE is the state after reading the mantissa and e in a number,
-// such as after reading `314e` or `0.314e`.
-func stateE(s *scanner, c byte) int {
-	if c == '+' || c == '-' {
-		s.step = stateESign
-		return scanContinue
-	}
-	return stateESign(s, c)
-}
-
-// stateESign is the state after reading the mantissa, e, and sign in a number,
-// such as after reading `314e-` or `0.314e+`.
-func stateESign(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' {
-		s.step = stateE0
-		return scanContinue
-	}
-	return s.error(c, "in exponent of numeric literal")
-}
-
-// stateE0 is the state after reading the mantissa, e, optional sign,
-// and at least one digit of the exponent in a number,
-// such as after reading `314e-2` or `0.314e+1` or `3.14e0`.
-func stateE0(s *scanner, c byte) int {
-	if '0' <= c && c <= '9' {
-		return scanContinue
-	}
-	return stateEndValue(s, c)
-}
-
-// stateT is the state after reading `t`.
-func stateT(s *scanner, c byte) int {
-	if c == 'r' {
-		s.step = stateTr
-		return scanContinue
-	}
-	return s.error(c, "in literal true (expecting 'r')")
-}
-
-// stateTr is the state after reading `tr`.
-func stateTr(s *scanner, c byte) int {
-	if c == 'u' {
-		s.step = stateTru
-		return scanContinue
-	}
-	return s.error(c, "in literal true (expecting 'u')")
-}
-
-// stateTru is the state after reading `tru`.
-func stateTru(s *scanner, c byte) int {
-	if c == 'e' {
-		s.step = stateEndValue
-		return scanContinue
-	}
-	return s.error(c, "in literal true (expecting 'e')")
-}
-
-// stateF is the state after reading `f`.
-func stateF(s *scanner, c byte) int {
-	if c == 'a' {
-		s.step = stateFa
-		return scanContinue
-	}
-	return s.error(c, "in literal false (expecting 'a')")
-}
-
-// stateFa is the state after reading `fa`.
-func stateFa(s *scanner, c byte) int {
-	if c == 'l' {
-		s.step = stateFal
-		return scanContinue
-	}
-	return s.error(c, "in literal false (expecting 'l')")
-}
-
-// stateFal is the state after reading `fal`.
-func stateFal(s *scanner, c byte) int {
-	if c == 's' {
-		s.step = stateFals
-		return scanContinue
-	}
-	return s.error(c, "in literal false (expecting 's')")
-}
-
-// stateFals is the state after reading `fals`.
-func stateFals(s *scanner, c byte) int {
-	if c == 'e' {
-		s.step = stateEndValue
-		return scanContinue
-	}
-	return s.error(c, "in literal false (expecting 'e')")
-}
-
-// stateN is the state after reading `n`.
-func stateN(s *scanner, c byte) int {
-	if c == 'u' {
-		s.step = stateNu
-		return scanContinue
-	}
-	return s.error(c, "in literal null (expecting 'u')")
-}
-
-// stateNu is the state after reading `nu`.
-func stateNu(s *scanner, c byte) int {
-	if c == 'l' {
-		s.step = stateNul
-		return scanContinue
-	}
-	return s.error(c, "in literal null (expecting 'l')")
-}
-
-// stateNul is the state after reading `nul`.
-func stateNul(s *scanner, c byte) int {
-	if c == 'l' {
-		s.step = stateEndValue
-		return scanContinue
-	}
-	return s.error(c, "in literal null (expecting 'l')")
-}
-
-// stateError is the state after reaching a syntax error,
-// such as after reading `[1}` or `5.1.2`.
-func stateError(s *scanner, c byte) int {
-	return scanError
-}
-
-// error records an error and switches to the error state.
-func (s *scanner) error(c byte, context string) int {
-	s.step = stateError
-	s.err = &SyntaxError{"invalid character " + quoteChar(c) + " " + context, s.bytes}
-	return scanError
-}
-
-// quoteChar formats c as a quoted character literal
-func quoteChar(c byte) string {
-	// special cases - different from quoted strings
-	if c == '\'' {
-		return `'\''`
-	}
-	if c == '"' {
-		return `'"'`
-	}
-
-	// use quoted string with different quotation marks
-	s := strconv.Quote(string(c))
-	return "'" + s[1:len(s)-1] + "'"
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/math.go b/vendor/github.com/d5/tengo/stdlib/math.go
deleted file mode 100644
index 08d82bdf..00000000
--- a/vendor/github.com/d5/tengo/stdlib/math.go
+++ /dev/null
@@ -1,74 +0,0 @@
-package stdlib
-
-import (
-	"math"
-
-	"github.com/d5/tengo/objects"
-)
-
-var mathModule = map[string]objects.Object{
-	"e":         &objects.Float{Value: math.E},
-	"pi":        &objects.Float{Value: math.Pi},
-	"phi":       &objects.Float{Value: math.Phi},
-	"sqrt2":     &objects.Float{Value: math.Sqrt2},
-	"sqrtE":     &objects.Float{Value: math.SqrtE},
-	"sqrtPi":    &objects.Float{Value: math.SqrtPi},
-	"sqrtPhi":   &objects.Float{Value: math.SqrtPhi},
-	"ln2":       &objects.Float{Value: math.Ln2},
-	"log2E":     &objects.Float{Value: math.Log2E},
-	"ln10":      &objects.Float{Value: math.Ln10},
-	"log10E":    &objects.Float{Value: math.Log10E},
-	"abs":       &objects.UserFunction{Name: "abs", Value: FuncAFRF(math.Abs)},
-	"acos":      &objects.UserFunction{Name: "acos", Value: FuncAFRF(math.Acos)},
-	"acosh":     &objects.UserFunction{Name: "acosh", Value: FuncAFRF(math.Acosh)},
-	"asin":      &objects.UserFunction{Name: "asin", Value: FuncAFRF(math.Asin)},
-	"asinh":     &objects.UserFunction{Name: "asinh", Value: FuncAFRF(math.Asinh)},
-	"atan":      &objects.UserFunction{Name: "atan", Value: FuncAFRF(math.Atan)},
-	"atan2":     &objects.UserFunction{Name: "atan2", Value: FuncAFFRF(math.Atan2)},
-	"atanh":     &objects.UserFunction{Name: "atanh", Value: FuncAFRF(math.Atanh)},
-	"cbrt":      &objects.UserFunction{Name: "cbrt", Value: FuncAFRF(math.Cbrt)},
-	"ceil":      &objects.UserFunction{Name: "ceil", Value: FuncAFRF(math.Ceil)},
-	"copysign":  &objects.UserFunction{Name: "copysign", Value: FuncAFFRF(math.Copysign)},
-	"cos":       &objects.UserFunction{Name: "cos", Value: FuncAFRF(math.Cos)},
-	"cosh":      &objects.UserFunction{Name: "cosh", Value: FuncAFRF(math.Cosh)},
-	"dim":       &objects.UserFunction{Name: "dim", Value: FuncAFFRF(math.Dim)},
-	"erf":       &objects.UserFunction{Name: "erf", Value: FuncAFRF(math.Erf)},
-	"erfc":      &objects.UserFunction{Name: "erfc", Value: FuncAFRF(math.Erfc)},
-	"exp":       &objects.UserFunction{Name: "exp", Value: FuncAFRF(math.Exp)},
-	"exp2":      &objects.UserFunction{Name: "exp2", Value: FuncAFRF(math.Exp2)},
-	"expm1":     &objects.UserFunction{Name: "expm1", Value: FuncAFRF(math.Expm1)},
-	"floor":     &objects.UserFunction{Name: "floor", Value: FuncAFRF(math.Floor)},
-	"gamma":     &objects.UserFunction{Name: "gamma", Value: FuncAFRF(math.Gamma)},
-	"hypot":     &objects.UserFunction{Name: "hypot", Value: FuncAFFRF(math.Hypot)},
-	"ilogb":     &objects.UserFunction{Name: "ilogb", Value: FuncAFRI(math.Ilogb)},
-	"inf":       &objects.UserFunction{Name: "inf", Value: FuncAIRF(math.Inf)},
-	"is_inf":    &objects.UserFunction{Name: "is_inf", Value: FuncAFIRB(math.IsInf)},
-	"is_nan":    &objects.UserFunction{Name: "is_nan", Value: FuncAFRB(math.IsNaN)},
-	"j0":        &objects.UserFunction{Name: "j0", Value: FuncAFRF(math.J0)},
-	"j1":        &objects.UserFunction{Name: "j1", Value: FuncAFRF(math.J1)},
-	"jn":        &objects.UserFunction{Name: "jn", Value: FuncAIFRF(math.Jn)},
-	"ldexp":     &objects.UserFunction{Name: "ldexp", Value: FuncAFIRF(math.Ldexp)},
-	"log":       &objects.UserFunction{Name: "log", Value: FuncAFRF(math.Log)},
-	"log10":     &objects.UserFunction{Name: "log10", Value: FuncAFRF(math.Log10)},
-	"log1p":     &objects.UserFunction{Name: "log1p", Value: FuncAFRF(math.Log1p)},
-	"log2":      &objects.UserFunction{Name: "log2", Value: FuncAFRF(math.Log2)},
-	"logb":      &objects.UserFunction{Name: "logb", Value: FuncAFRF(math.Logb)},
-	"max":       &objects.UserFunction{Name: "max", Value: FuncAFFRF(math.Max)},
-	"min":       &objects.UserFunction{Name: "min", Value: FuncAFFRF(math.Min)},
-	"mod":       &objects.UserFunction{Name: "mod", Value: FuncAFFRF(math.Mod)},
-	"nan":       &objects.UserFunction{Name: "nan", Value: FuncARF(math.NaN)},
-	"nextafter": &objects.UserFunction{Name: "nextafter", Value: FuncAFFRF(math.Nextafter)},
-	"pow":       &objects.UserFunction{Name: "pow", Value: FuncAFFRF(math.Pow)},
-	"pow10":     &objects.UserFunction{Name: "pow10", Value: FuncAIRF(math.Pow10)},
-	"remainder": &objects.UserFunction{Name: "remainder", Value: FuncAFFRF(math.Remainder)},
-	"signbit":   &objects.UserFunction{Name: "signbit", Value: FuncAFRB(math.Signbit)},
-	"sin":       &objects.UserFunction{Name: "sin", Value: FuncAFRF(math.Sin)},
-	"sinh":      &objects.UserFunction{Name: "sinh", Value: FuncAFRF(math.Sinh)},
-	"sqrt":      &objects.UserFunction{Name: "sqrt", Value: FuncAFRF(math.Sqrt)},
-	"tan":       &objects.UserFunction{Name: "tan", Value: FuncAFRF(math.Tan)},
-	"tanh":      &objects.UserFunction{Name: "tanh", Value: FuncAFRF(math.Tanh)},
-	"trunc":     &objects.UserFunction{Name: "trunc", Value: FuncAFRF(math.Trunc)},
-	"y0":        &objects.UserFunction{Name: "y0", Value: FuncAFRF(math.Y0)},
-	"y1":        &objects.UserFunction{Name: "y1", Value: FuncAFRF(math.Y1)},
-	"yn":        &objects.UserFunction{Name: "yn", Value: FuncAIFRF(math.Yn)},
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/os.go b/vendor/github.com/d5/tengo/stdlib/os.go
deleted file mode 100644
index a7890cc1..00000000
--- a/vendor/github.com/d5/tengo/stdlib/os.go
+++ /dev/null
@@ -1,492 +0,0 @@
-package stdlib
-
-import (
-	"fmt"
-	"io"
-	"io/ioutil"
-	"os"
-	"os/exec"
-
-	"github.com/d5/tengo"
-	"github.com/d5/tengo/objects"
-)
-
-var osModule = map[string]objects.Object{
-	"o_rdonly":            &objects.Int{Value: int64(os.O_RDONLY)},
-	"o_wronly":            &objects.Int{Value: int64(os.O_WRONLY)},
-	"o_rdwr":              &objects.Int{Value: int64(os.O_RDWR)},
-	"o_append":            &objects.Int{Value: int64(os.O_APPEND)},
-	"o_create":            &objects.Int{Value: int64(os.O_CREATE)},
-	"o_excl":              &objects.Int{Value: int64(os.O_EXCL)},
-	"o_sync":              &objects.Int{Value: int64(os.O_SYNC)},
-	"o_trunc":             &objects.Int{Value: int64(os.O_TRUNC)},
-	"mode_dir":            &objects.Int{Value: int64(os.ModeDir)},
-	"mode_append":         &objects.Int{Value: int64(os.ModeAppend)},
-	"mode_exclusive":      &objects.Int{Value: int64(os.ModeExclusive)},
-	"mode_temporary":      &objects.Int{Value: int64(os.ModeTemporary)},
-	"mode_symlink":        &objects.Int{Value: int64(os.ModeSymlink)},
-	"mode_device":         &objects.Int{Value: int64(os.ModeDevice)},
-	"mode_named_pipe":     &objects.Int{Value: int64(os.ModeNamedPipe)},
-	"mode_socket":         &objects.Int{Value: int64(os.ModeSocket)},
-	"mode_setuid":         &objects.Int{Value: int64(os.ModeSetuid)},
-	"mode_setgui":         &objects.Int{Value: int64(os.ModeSetgid)},
-	"mode_char_device":    &objects.Int{Value: int64(os.ModeCharDevice)},
-	"mode_sticky":         &objects.Int{Value: int64(os.ModeSticky)},
-	"mode_type":           &objects.Int{Value: int64(os.ModeType)},
-	"mode_perm":           &objects.Int{Value: int64(os.ModePerm)},
-	"path_separator":      &objects.Char{Value: os.PathSeparator},
-	"path_list_separator": &objects.Char{Value: os.PathListSeparator},
-	"dev_null":            &objects.String{Value: os.DevNull},
-	"seek_set":            &objects.Int{Value: int64(io.SeekStart)},
-	"seek_cur":            &objects.Int{Value: int64(io.SeekCurrent)},
-	"seek_end":            &objects.Int{Value: int64(io.SeekEnd)},
-	"args":                &objects.UserFunction{Name: "args", Value: osArgs},                             // args() => array(string)
-	"chdir":               &objects.UserFunction{Name: "chdir", Value: FuncASRE(os.Chdir)},                // chdir(dir string) => error
-	"chmod":               osFuncASFmRE("chmod", os.Chmod),                                                // chmod(name string, mode int) => error
-	"chown":               &objects.UserFunction{Name: "chown", Value: FuncASIIRE(os.Chown)},              // chown(name string, uid int, gid int) => error
-	"clearenv":            &objects.UserFunction{Name: "clearenv", Value: FuncAR(os.Clearenv)},            // clearenv()
-	"environ":             &objects.UserFunction{Name: "environ", Value: FuncARSs(os.Environ)},            // environ() => array(string)
-	"exit":                &objects.UserFunction{Name: "exit", Value: FuncAIR(os.Exit)},                   // exit(code int)
-	"expand_env":          &objects.UserFunction{Name: "expand_env", Value: osExpandEnv},                  // expand_env(s string) => string
-	"getegid":             &objects.UserFunction{Name: "getegid", Value: FuncARI(os.Getegid)},             // getegid() => int
-	"getenv":              &objects.UserFunction{Name: "getenv", Value: FuncASRS(os.Getenv)},              // getenv(s string) => string
-	"geteuid":             &objects.UserFunction{Name: "geteuid", Value: FuncARI(os.Geteuid)},             // geteuid() => int
-	"getgid":              &objects.UserFunction{Name: "getgid", Value: FuncARI(os.Getgid)},               // getgid() => int
-	"getgroups":           &objects.UserFunction{Name: "getgroups", Value: FuncARIsE(os.Getgroups)},       // getgroups() => array(string)/error
-	"getpagesize":         &objects.UserFunction{Name: "getpagesize", Value: FuncARI(os.Getpagesize)},     // getpagesize() => int
-	"getpid":              &objects.UserFunction{Name: "getpid", Value: FuncARI(os.Getpid)},               // getpid() => int
-	"getppid":             &objects.UserFunction{Name: "getppid", Value: FuncARI(os.Getppid)},             // getppid() => int
-	"getuid":              &objects.UserFunction{Name: "getuid", Value: FuncARI(os.Getuid)},               // getuid() => int
-	"getwd":               &objects.UserFunction{Name: "getwd", Value: FuncARSE(os.Getwd)},                // getwd() => string/error
-	"hostname":            &objects.UserFunction{Name: "hostname", Value: FuncARSE(os.Hostname)},          // hostname() => string/error
-	"lchown":              &objects.UserFunction{Name: "lchown", Value: FuncASIIRE(os.Lchown)},            // lchown(name string, uid int, gid int) => error
-	"link":                &objects.UserFunction{Name: "link", Value: FuncASSRE(os.Link)},                 // link(oldname string, newname string) => error
-	"lookup_env":          &objects.UserFunction{Name: "lookup_env", Value: osLookupEnv},                  // lookup_env(key string) => string/false
-	"mkdir":               osFuncASFmRE("mkdir", os.Mkdir),                                                // mkdir(name string, perm int) => error
-	"mkdir_all":           osFuncASFmRE("mkdir_all", os.MkdirAll),                                         // mkdir_all(name string, perm int) => error
-	"readlink":            &objects.UserFunction{Name: "readlink", Value: FuncASRSE(os.Readlink)},         // readlink(name string) => string/error
-	"remove":              &objects.UserFunction{Name: "remove", Value: FuncASRE(os.Remove)},              // remove(name string) => error
-	"remove_all":          &objects.UserFunction{Name: "remove_all", Value: FuncASRE(os.RemoveAll)},       // remove_all(name string) => error
-	"rename":              &objects.UserFunction{Name: "rename", Value: FuncASSRE(os.Rename)},             // rename(oldpath string, newpath string) => error
-	"setenv":              &objects.UserFunction{Name: "setenv", Value: FuncASSRE(os.Setenv)},             // setenv(key string, value string) => error
-	"symlink":             &objects.UserFunction{Name: "symlink", Value: FuncASSRE(os.Symlink)},           // symlink(oldname string newname string) => error
-	"temp_dir":            &objects.UserFunction{Name: "temp_dir", Value: FuncARS(os.TempDir)},            // temp_dir() => string
-	"truncate":            &objects.UserFunction{Name: "truncate", Value: FuncASI64RE(os.Truncate)},       // truncate(name string, size int) => error
-	"unsetenv":            &objects.UserFunction{Name: "unsetenv", Value: FuncASRE(os.Unsetenv)},          // unsetenv(key string) => error
-	"create":              &objects.UserFunction{Name: "create", Value: osCreate},                         // create(name string) => imap(file)/error
-	"open":                &objects.UserFunction{Name: "open", Value: osOpen},                             // open(name string) => imap(file)/error
-	"open_file":           &objects.UserFunction{Name: "open_file", Value: osOpenFile},                    // open_file(name string, flag int, perm int) => imap(file)/error
-	"find_process":        &objects.UserFunction{Name: "find_process", Value: osFindProcess},              // find_process(pid int) => imap(process)/error
-	"start_process":       &objects.UserFunction{Name: "start_process", Value: osStartProcess},            // start_process(name string, argv array(string), dir string, env array(string)) => imap(process)/error
-	"exec_look_path":      &objects.UserFunction{Name: "exec_look_path", Value: FuncASRSE(exec.LookPath)}, // exec_look_path(file) => string/error
-	"exec":                &objects.UserFunction{Name: "exec", Value: osExec},                             // exec(name, args...) => command
-	"stat":                &objects.UserFunction{Name: "stat", Value: osStat},                             // stat(name) => imap(fileinfo)/error
-	"read_file":           &objects.UserFunction{Name: "read_file", Value: osReadFile},                    // readfile(name) => array(byte)/error
-}
-
-func osReadFile(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	fname, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	bytes, err := ioutil.ReadFile(fname)
-	if err != nil {
-		return wrapError(err), nil
-	}
-
-	if len(bytes) > tengo.MaxBytesLen {
-		return nil, objects.ErrBytesLimit
-	}
-
-	return &objects.Bytes{Value: bytes}, nil
-}
-
-func osStat(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	fname, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	stat, err := os.Stat(fname)
-	if err != nil {
-		return wrapError(err), nil
-	}
-
-	fstat := &objects.ImmutableMap{
-		Value: map[string]objects.Object{
-			"name":  &objects.String{Value: stat.Name()},
-			"mtime": &objects.Time{Value: stat.ModTime()},
-			"size":  &objects.Int{Value: stat.Size()},
-			"mode":  &objects.Int{Value: int64(stat.Mode())},
-		},
-	}
-
-	if stat.IsDir() {
-		fstat.Value["directory"] = objects.TrueValue
-	} else {
-		fstat.Value["directory"] = objects.FalseValue
-	}
-
-	return fstat, nil
-}
-
-func osCreate(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	res, err := os.Create(s1)
-	if err != nil {
-		return wrapError(err), nil
-	}
-
-	return makeOSFile(res), nil
-}
-
-func osOpen(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	res, err := os.Open(s1)
-	if err != nil {
-		return wrapError(err), nil
-	}
-
-	return makeOSFile(res), nil
-}
-
-func osOpenFile(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 3 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-	}
-
-	i3, ok := objects.ToInt(args[2])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "int(compatible)",
-			Found:    args[2].TypeName(),
-		}
-	}
-
-	res, err := os.OpenFile(s1, i2, os.FileMode(i3))
-	if err != nil {
-		return wrapError(err), nil
-	}
-
-	return makeOSFile(res), nil
-}
-
-func osArgs(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 0 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	arr := &objects.Array{}
-	for _, osArg := range os.Args {
-		if len(osArg) > tengo.MaxStringLen {
-			return nil, objects.ErrStringLimit
-		}
-
-		arr.Value = append(arr.Value, &objects.String{Value: osArg})
-	}
-
-	return arr, nil
-}
-
-func osFuncASFmRE(name string, fn func(string, os.FileMode) error) *objects.UserFunction {
-	return &objects.UserFunction{
-		Name: name,
-		Value: func(args ...objects.Object) (objects.Object, error) {
-			if len(args) != 2 {
-				return nil, objects.ErrWrongNumArguments
-			}
-
-			s1, ok := objects.ToString(args[0])
-			if !ok {
-				return nil, objects.ErrInvalidArgumentType{
-					Name:     "first",
-					Expected: "string(compatible)",
-					Found:    args[0].TypeName(),
-				}
-			}
-			i2, ok := objects.ToInt64(args[1])
-			if !ok {
-				return nil, objects.ErrInvalidArgumentType{
-					Name:     "second",
-					Expected: "int(compatible)",
-					Found:    args[1].TypeName(),
-				}
-			}
-
-			return wrapError(fn(s1, os.FileMode(i2))), nil
-		},
-	}
-}
-
-func osLookupEnv(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	res, ok := os.LookupEnv(s1)
-	if !ok {
-		return objects.FalseValue, nil
-	}
-
-	if len(res) > tengo.MaxStringLen {
-		return nil, objects.ErrStringLimit
-	}
-
-	return &objects.String{Value: res}, nil
-}
-
-func osExpandEnv(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	var vlen int
-	var failed bool
-	s := os.Expand(s1, func(k string) string {
-		if failed {
-			return ""
-		}
-
-		v := os.Getenv(k)
-
-		// this does not count the other texts that are not being replaced
-		// but the code checks the final length at the end
-		vlen += len(v)
-		if vlen > tengo.MaxStringLen {
-			failed = true
-			return ""
-		}
-
-		return v
-	})
-
-	if failed || len(s) > tengo.MaxStringLen {
-		return nil, objects.ErrStringLimit
-	}
-
-	return &objects.String{Value: s}, nil
-}
-
-func osExec(args ...objects.Object) (objects.Object, error) {
-	if len(args) == 0 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	name, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	var execArgs []string
-	for idx, arg := range args[1:] {
-		execArg, ok := objects.ToString(arg)
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     fmt.Sprintf("args[%d]", idx),
-				Expected: "string(compatible)",
-				Found:    args[1+idx].TypeName(),
-			}
-		}
-
-		execArgs = append(execArgs, execArg)
-	}
-
-	return makeOSExecCommand(exec.Command(name, execArgs...)), nil
-}
-
-func osFindProcess(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 1 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	i1, ok := objects.ToInt(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	proc, err := os.FindProcess(i1)
-	if err != nil {
-		return wrapError(err), nil
-	}
-
-	return makeOSProcess(proc), nil
-}
-
-func osStartProcess(args ...objects.Object) (objects.Object, error) {
-	if len(args) != 4 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	name, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	var argv []string
-	var err error
-	switch arg1 := args[1].(type) {
-	case *objects.Array:
-		argv, err = stringArray(arg1.Value, "second")
-		if err != nil {
-			return nil, err
-		}
-	case *objects.ImmutableArray:
-		argv, err = stringArray(arg1.Value, "second")
-		if err != nil {
-			return nil, err
-		}
-	default:
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "array",
-			Found:    arg1.TypeName(),
-		}
-	}
-
-	dir, ok := objects.ToString(args[2])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "string(compatible)",
-			Found:    args[2].TypeName(),
-		}
-	}
-
-	var env []string
-	switch arg3 := args[3].(type) {
-	case *objects.Array:
-		env, err = stringArray(arg3.Value, "fourth")
-		if err != nil {
-			return nil, err
-		}
-	case *objects.ImmutableArray:
-		env, err = stringArray(arg3.Value, "fourth")
-		if err != nil {
-			return nil, err
-		}
-	default:
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "fourth",
-			Expected: "array",
-			Found:    arg3.TypeName(),
-		}
-	}
-
-	proc, err := os.StartProcess(name, argv, &os.ProcAttr{
-		Dir: dir,
-		Env: env,
-	})
-	if err != nil {
-		return wrapError(err), nil
-	}
-
-	return makeOSProcess(proc), nil
-}
-
-func stringArray(arr []objects.Object, argName string) ([]string, error) {
-	var sarr []string
-	for idx, elem := range arr {
-		str, ok := elem.(*objects.String)
-		if !ok {
-			return nil, objects.ErrInvalidArgumentType{
-				Name:     fmt.Sprintf("%s[%d]", argName, idx),
-				Expected: "string",
-				Found:    elem.TypeName(),
-			}
-		}
-
-		sarr = append(sarr, str.Value)
-	}
-
-	return sarr, nil
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/os_exec.go b/vendor/github.com/d5/tengo/stdlib/os_exec.go
deleted file mode 100644
index 5274c36a..00000000
--- a/vendor/github.com/d5/tengo/stdlib/os_exec.go
+++ /dev/null
@@ -1,113 +0,0 @@
-package stdlib
-
-import (
-	"os/exec"
-
-	"github.com/d5/tengo/objects"
-)
-
-func makeOSExecCommand(cmd *exec.Cmd) *objects.ImmutableMap {
-	return &objects.ImmutableMap{
-		Value: map[string]objects.Object{
-			// combined_output() => bytes/error
-			"combined_output": &objects.UserFunction{Name: "combined_output", Value: FuncARYE(cmd.CombinedOutput)}, //
-			// output() => bytes/error
-			"output": &objects.UserFunction{Name: "output", Value: FuncARYE(cmd.Output)}, //
-			// run() => error
-			"run": &objects.UserFunction{Name: "run", Value: FuncARE(cmd.Run)}, //
-			// start() => error
-			"start": &objects.UserFunction{Name: "start", Value: FuncARE(cmd.Start)}, //
-			// wait() => error
-			"wait": &objects.UserFunction{Name: "wait", Value: FuncARE(cmd.Wait)}, //
-			// set_path(path string)
-			"set_path": &objects.UserFunction{
-				Name: "set_path",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 1 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					s1, ok := objects.ToString(args[0])
-					if !ok {
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "string(compatible)",
-							Found:    args[0].TypeName(),
-						}
-					}
-
-					cmd.Path = s1
-
-					return objects.UndefinedValue, nil
-				},
-			},
-			// set_dir(dir string)
-			"set_dir": &objects.UserFunction{
-				Name: "set_dir",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 1 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					s1, ok := objects.ToString(args[0])
-					if !ok {
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "string(compatible)",
-							Found:    args[0].TypeName(),
-						}
-					}
-
-					cmd.Dir = s1
-
-					return objects.UndefinedValue, nil
-				},
-			},
-			// set_env(env array(string))
-			"set_env": &objects.UserFunction{
-				Name: "set_env",
-				Value: func(args ...objects.Object) (objects.Object, error) {
-					if len(args) != 1 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					var env []string
-					var err error
-					switch arg0 := args[0].(type) {
-					case *objects.Array:
-						env, err = stringArray(arg0.Value, "first")
-						if err != nil {
-							return nil, err
-						}
-					case *objects.ImmutableArray:
-						env, err = stringArray(arg0.Value, "first")
-						if err != nil {
-							return nil, err
-						}
-					default:
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "array",
-							Found:    arg0.TypeName(),
-						}
-					}
-
-					cmd.Env = env
-
-					return objects.UndefinedValue, nil
-				},
-			},
-			// process() => imap(process)
-			"process": &objects.UserFunction{
-				Name: "process",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 0 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					return makeOSProcess(cmd.Process), nil
-				},
-			},
-		},
-	}
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/os_file.go b/vendor/github.com/d5/tengo/stdlib/os_file.go
deleted file mode 100644
index ee9f625a..00000000
--- a/vendor/github.com/d5/tengo/stdlib/os_file.go
+++ /dev/null
@@ -1,96 +0,0 @@
-package stdlib
-
-import (
-	"os"
-
-	"github.com/d5/tengo/objects"
-)
-
-func makeOSFile(file *os.File) *objects.ImmutableMap {
-	return &objects.ImmutableMap{
-		Value: map[string]objects.Object{
-			// chdir() => true/error
-			"chdir": &objects.UserFunction{Name: "chdir", Value: FuncARE(file.Chdir)}, //
-			// chown(uid int, gid int) => true/error
-			"chown": &objects.UserFunction{Name: "chown", Value: FuncAIIRE(file.Chown)}, //
-			// close() => error
-			"close": &objects.UserFunction{Name: "close", Value: FuncARE(file.Close)}, //
-			// name() => string
-			"name": &objects.UserFunction{Name: "name", Value: FuncARS(file.Name)}, //
-			// readdirnames(n int) => array(string)/error
-			"readdirnames": &objects.UserFunction{Name: "readdirnames", Value: FuncAIRSsE(file.Readdirnames)}, //
-			// sync() => error
-			"sync": &objects.UserFunction{Name: "sync", Value: FuncARE(file.Sync)}, //
-			// write(bytes) => int/error
-			"write": &objects.UserFunction{Name: "write", Value: FuncAYRIE(file.Write)}, //
-			// write(string) => int/error
-			"write_string": &objects.UserFunction{Name: "write_string", Value: FuncASRIE(file.WriteString)}, //
-			// read(bytes) => int/error
-			"read": &objects.UserFunction{Name: "read", Value: FuncAYRIE(file.Read)}, //
-			// chmod(mode int) => error
-			"chmod": &objects.UserFunction{
-				Name: "chmod",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 1 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					i1, ok := objects.ToInt64(args[0])
-					if !ok {
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "int(compatible)",
-							Found:    args[0].TypeName(),
-						}
-					}
-
-					return wrapError(file.Chmod(os.FileMode(i1))), nil
-				},
-			},
-			// seek(offset int, whence int) => int/error
-			"seek": &objects.UserFunction{
-				Name: "seek",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 2 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					i1, ok := objects.ToInt64(args[0])
-					if !ok {
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "int(compatible)",
-							Found:    args[0].TypeName(),
-						}
-					}
-					i2, ok := objects.ToInt(args[1])
-					if !ok {
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "second",
-							Expected: "int(compatible)",
-							Found:    args[1].TypeName(),
-						}
-					}
-
-					res, err := file.Seek(i1, i2)
-					if err != nil {
-						return wrapError(err), nil
-					}
-
-					return &objects.Int{Value: res}, nil
-				},
-			},
-			// stat() => imap(fileinfo)/error
-			"stat": &objects.UserFunction{
-				Name: "start",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 0 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					return osStat(&objects.String{Value: file.Name()})
-				},
-			},
-		},
-	}
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/os_process.go b/vendor/github.com/d5/tengo/stdlib/os_process.go
deleted file mode 100644
index 801ccdef..00000000
--- a/vendor/github.com/d5/tengo/stdlib/os_process.go
+++ /dev/null
@@ -1,62 +0,0 @@
-package stdlib
-
-import (
-	"os"
-	"syscall"
-
-	"github.com/d5/tengo/objects"
-)
-
-func makeOSProcessState(state *os.ProcessState) *objects.ImmutableMap {
-	return &objects.ImmutableMap{
-		Value: map[string]objects.Object{
-			"exited":  &objects.UserFunction{Name: "exited", Value: FuncARB(state.Exited)},   //
-			"pid":     &objects.UserFunction{Name: "pid", Value: FuncARI(state.Pid)},         //
-			"string":  &objects.UserFunction{Name: "string", Value: FuncARS(state.String)},   //
-			"success": &objects.UserFunction{Name: "success", Value: FuncARB(state.Success)}, //
-		},
-	}
-}
-
-func makeOSProcess(proc *os.Process) *objects.ImmutableMap {
-	return &objects.ImmutableMap{
-		Value: map[string]objects.Object{
-			"kill":    &objects.UserFunction{Name: "kill", Value: FuncARE(proc.Kill)},       //
-			"release": &objects.UserFunction{Name: "release", Value: FuncARE(proc.Release)}, //
-			"signal": &objects.UserFunction{
-				Name: "signal",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 1 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					i1, ok := objects.ToInt64(args[0])
-					if !ok {
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "int(compatible)",
-							Found:    args[0].TypeName(),
-						}
-					}
-
-					return wrapError(proc.Signal(syscall.Signal(i1))), nil
-				},
-			},
-			"wait": &objects.UserFunction{
-				Name: "wait",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 0 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					state, err := proc.Wait()
-					if err != nil {
-						return wrapError(err), nil
-					}
-
-					return makeOSProcessState(state), nil
-				},
-			},
-		},
-	}
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/rand.go b/vendor/github.com/d5/tengo/stdlib/rand.go
deleted file mode 100644
index 6efe1de8..00000000
--- a/vendor/github.com/d5/tengo/stdlib/rand.go
+++ /dev/null
@@ -1,102 +0,0 @@
-package stdlib
-
-import (
-	"math/rand"
-
-	"github.com/d5/tengo/objects"
-)
-
-var randModule = map[string]objects.Object{
-	"int":        &objects.UserFunction{Name: "int", Value: FuncARI64(rand.Int63)},
-	"float":      &objects.UserFunction{Name: "float", Value: FuncARF(rand.Float64)},
-	"intn":       &objects.UserFunction{Name: "intn", Value: FuncAI64RI64(rand.Int63n)},
-	"exp_float":  &objects.UserFunction{Name: "exp_float", Value: FuncARF(rand.ExpFloat64)},
-	"norm_float": &objects.UserFunction{Name: "norm_float", Value: FuncARF(rand.NormFloat64)},
-	"perm":       &objects.UserFunction{Name: "perm", Value: FuncAIRIs(rand.Perm)},
-	"seed":       &objects.UserFunction{Name: "seed", Value: FuncAI64R(rand.Seed)},
-	"read": &objects.UserFunction{
-		Name: "read",
-		Value: func(args ...objects.Object) (ret objects.Object, err error) {
-			if len(args) != 1 {
-				return nil, objects.ErrWrongNumArguments
-			}
-
-			y1, ok := args[0].(*objects.Bytes)
-			if !ok {
-				return nil, objects.ErrInvalidArgumentType{
-					Name:     "first",
-					Expected: "bytes",
-					Found:    args[0].TypeName(),
-				}
-			}
-
-			res, err := rand.Read(y1.Value)
-			if err != nil {
-				ret = wrapError(err)
-				return
-			}
-
-			return &objects.Int{Value: int64(res)}, nil
-		},
-	},
-	"rand": &objects.UserFunction{
-		Name: "rand",
-		Value: func(args ...objects.Object) (ret objects.Object, err error) {
-			if len(args) != 1 {
-				return nil, objects.ErrWrongNumArguments
-			}
-
-			i1, ok := objects.ToInt64(args[0])
-			if !ok {
-				return nil, objects.ErrInvalidArgumentType{
-					Name:     "first",
-					Expected: "int(compatible)",
-					Found:    args[0].TypeName(),
-				}
-			}
-
-			src := rand.NewSource(i1)
-
-			return randRand(rand.New(src)), nil
-		},
-	},
-}
-
-func randRand(r *rand.Rand) *objects.ImmutableMap {
-	return &objects.ImmutableMap{
-		Value: map[string]objects.Object{
-			"int":        &objects.UserFunction{Name: "int", Value: FuncARI64(r.Int63)},
-			"float":      &objects.UserFunction{Name: "float", Value: FuncARF(r.Float64)},
-			"intn":       &objects.UserFunction{Name: "intn", Value: FuncAI64RI64(r.Int63n)},
-			"exp_float":  &objects.UserFunction{Name: "exp_float", Value: FuncARF(r.ExpFloat64)},
-			"norm_float": &objects.UserFunction{Name: "norm_float", Value: FuncARF(r.NormFloat64)},
-			"perm":       &objects.UserFunction{Name: "perm", Value: FuncAIRIs(r.Perm)},
-			"seed":       &objects.UserFunction{Name: "seed", Value: FuncAI64R(r.Seed)},
-			"read": &objects.UserFunction{
-				Name: "read",
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 1 {
-						return nil, objects.ErrWrongNumArguments
-					}
-
-					y1, ok := args[0].(*objects.Bytes)
-					if !ok {
-						return nil, objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "bytes",
-							Found:    args[0].TypeName(),
-						}
-					}
-
-					res, err := r.Read(y1.Value)
-					if err != nil {
-						ret = wrapError(err)
-						return
-					}
-
-					return &objects.Int{Value: int64(res)}, nil
-				},
-			},
-		},
-	}
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/source_modules.go b/vendor/github.com/d5/tengo/stdlib/source_modules.go
deleted file mode 100644
index ca69d7d1..00000000
--- a/vendor/github.com/d5/tengo/stdlib/source_modules.go
+++ /dev/null
@@ -1,8 +0,0 @@
-// Code generated using gensrcmods.go; DO NOT EDIT.
-
-package stdlib
-
-// SourceModules are source type standard library modules.
-var SourceModules = map[string]string{
-	"enum": "is_enumerable := func(x) {\n  return is_array(x) || is_map(x) || is_immutable_array(x) || is_immutable_map(x)\n}\n\nis_array_like := func(x) {\n  return is_array(x) || is_immutable_array(x)\n}\n\nexport {\n  // all returns true if the given function `fn` evaluates to a truthy value on\n  // all of the items in `x`. It returns undefined if `x` is not enumerable.\n  all: func(x, fn) {\n    if !is_enumerable(x) { return undefined }\n\n    for k, v in x {\n      if !fn(k, v) { return false }\n    }\n\n    return true\n  },\n  // any returns true if the given function `fn` evaluates to a truthy value on\n  // any of the items in `x`. It returns undefined if `x` is not enumerable.\n  any: func(x, fn) {\n    if !is_enumerable(x) { return undefined }\n\n    for k, v in x {\n      if fn(k, v) { return true }\n    }\n\n    return false\n  },\n  // chunk returns an array of elements split into groups the length of size.\n  // If `x` can't be split evenly, the final chunk will be the remaining elements.\n  // It returns undefined if `x` is not array.\n  chunk: func(x, size) {\n    if !is_array_like(x) || !size { return undefined }\n\n    numElements := len(x)\n    if !numElements { return [] }\n\n    res := []\n    idx := 0\n    for idx < numElements {\n      res = append(res, x[idx:idx+size])\n      idx += size\n    }\n\n    return res\n  },\n  // at returns an element at the given index (if `x` is array) or\n  // key (if `x` is map). It returns undefined if `x` is not enumerable.\n  at: func(x, key) {\n    if !is_enumerable(x) { return undefined }\n\n    if is_array_like(x) {\n        if !is_int(key) { return undefined }\n    } else {\n        if !is_string(key) { return undefined }\n    }\n\n    return x[key]\n  },\n  // each iterates over elements of `x` and invokes `fn` for each element. `fn` is\n  // invoked with two arguments: `key` and `value`. `key` is an int index\n  // if `x` is array. `key` is a string key if `x` is map. It does not iterate\n  // and returns undefined if `x` is not enumerable.\n  each: func(x, fn) {\n    if !is_enumerable(x) { return undefined }\n\n    for k, v in x {\n      fn(k, v)\n    }\n  },\n  // filter iterates over elements of `x`, returning an array of all elements `fn`\n  // returns truthy for. `fn` is invoked with two arguments: `key` and `value`.\n  // `key` is an int index if `x` is array. `key` is a string key if `x` is map.\n  // It returns undefined if `x` is not enumerable.\n  filter: func(x, fn) {\n    if !is_array_like(x) { return undefined }\n\n    dst := []\n    for k, v in x {\n      if fn(k, v) { dst = append(dst, v) }\n    }\n\n    return dst\n  },\n  // find iterates over elements of `x`, returning value of the first element `fn`\n  // returns truthy for. `fn` is invoked with two arguments: `key` and `value`.\n  // `key` is an int index if `x` is array. `key` is a string key if `x` is map.\n  // It returns undefined if `x` is not enumerable.\n  find: func(x, fn) {\n    if !is_enumerable(x) { return undefined }\n\n    for k, v in x {\n      if fn(k, v) { return v }\n    }\n  },\n  // find_key iterates over elements of `x`, returning key or index of the first\n  // element `fn` returns truthy for. `fn` is invoked with two arguments: `key`\n  // and `value`. `key` is an int index if `x` is array. `key` is a string key if\n  // `x` is map. It returns undefined if `x` is not enumerable.\n  find_key: func(x, fn) {\n    if !is_enumerable(x) { return undefined }\n\n    for k, v in x {\n      if fn(k, v) { return k }\n    }\n  },\n  // map creates an array of values by running each element in `x` through `fn`.\n  // `fn` is invoked with two arguments: `key` and `value`. `key` is an int index\n  // if `x` is array. `key` is a string key if `x` is map. It returns undefined\n  // if `x` is not enumerable.\n  map: func(x, fn) {\n    if !is_enumerable(x) { return undefined }\n\n    dst := []\n    for k, v in x {\n      dst = append(dst, fn(k, v))\n    }\n\n    return dst\n  },\n  // key returns the first argument.\n  key: func(k, _) { return k },\n  // value returns the second argument.\n  value: func(_, v) { return v }\n}\n",
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/srcmod_enum.tengo b/vendor/github.com/d5/tengo/stdlib/srcmod_enum.tengo
deleted file mode 100644
index 7a5ea637..00000000
--- a/vendor/github.com/d5/tengo/stdlib/srcmod_enum.tengo
+++ /dev/null
@@ -1,128 +0,0 @@
-is_enumerable := func(x) {
-  return is_array(x) || is_map(x) || is_immutable_array(x) || is_immutable_map(x)
-}
-
-is_array_like := func(x) {
-  return is_array(x) || is_immutable_array(x)
-}
-
-export {
-  // all returns true if the given function `fn` evaluates to a truthy value on
-  // all of the items in `x`. It returns undefined if `x` is not enumerable.
-  all: func(x, fn) {
-    if !is_enumerable(x) { return undefined }
-
-    for k, v in x {
-      if !fn(k, v) { return false }
-    }
-
-    return true
-  },
-  // any returns true if the given function `fn` evaluates to a truthy value on
-  // any of the items in `x`. It returns undefined if `x` is not enumerable.
-  any: func(x, fn) {
-    if !is_enumerable(x) { return undefined }
-
-    for k, v in x {
-      if fn(k, v) { return true }
-    }
-
-    return false
-  },
-  // chunk returns an array of elements split into groups the length of size.
-  // If `x` can't be split evenly, the final chunk will be the remaining elements.
-  // It returns undefined if `x` is not array.
-  chunk: func(x, size) {
-    if !is_array_like(x) || !size { return undefined }
-
-    numElements := len(x)
-    if !numElements { return [] }
-
-    res := []
-    idx := 0
-    for idx < numElements {
-      res = append(res, x[idx:idx+size])
-      idx += size
-    }
-
-    return res
-  },
-  // at returns an element at the given index (if `x` is array) or
-  // key (if `x` is map). It returns undefined if `x` is not enumerable.
-  at: func(x, key) {
-    if !is_enumerable(x) { return undefined }
-
-    if is_array_like(x) {
-        if !is_int(key) { return undefined }
-    } else {
-        if !is_string(key) { return undefined }
-    }
-
-    return x[key]
-  },
-  // each iterates over elements of `x` and invokes `fn` for each element. `fn` is
-  // invoked with two arguments: `key` and `value`. `key` is an int index
-  // if `x` is array. `key` is a string key if `x` is map. It does not iterate
-  // and returns undefined if `x` is not enumerable.
-  each: func(x, fn) {
-    if !is_enumerable(x) { return undefined }
-
-    for k, v in x {
-      fn(k, v)
-    }
-  },
-  // filter iterates over elements of `x`, returning an array of all elements `fn`
-  // returns truthy for. `fn` is invoked with two arguments: `key` and `value`.
-  // `key` is an int index if `x` is array. `key` is a string key if `x` is map.
-  // It returns undefined if `x` is not enumerable.
-  filter: func(x, fn) {
-    if !is_array_like(x) { return undefined }
-
-    dst := []
-    for k, v in x {
-      if fn(k, v) { dst = append(dst, v) }
-    }
-
-    return dst
-  },
-  // find iterates over elements of `x`, returning value of the first element `fn`
-  // returns truthy for. `fn` is invoked with two arguments: `key` and `value`.
-  // `key` is an int index if `x` is array. `key` is a string key if `x` is map.
-  // It returns undefined if `x` is not enumerable.
-  find: func(x, fn) {
-    if !is_enumerable(x) { return undefined }
-
-    for k, v in x {
-      if fn(k, v) { return v }
-    }
-  },
-  // find_key iterates over elements of `x`, returning key or index of the first
-  // element `fn` returns truthy for. `fn` is invoked with two arguments: `key`
-  // and `value`. `key` is an int index if `x` is array. `key` is a string key if
-  // `x` is map. It returns undefined if `x` is not enumerable.
-  find_key: func(x, fn) {
-    if !is_enumerable(x) { return undefined }
-
-    for k, v in x {
-      if fn(k, v) { return k }
-    }
-  },
-  // map creates an array of values by running each element in `x` through `fn`.
-  // `fn` is invoked with two arguments: `key` and `value`. `key` is an int index
-  // if `x` is array. `key` is a string key if `x` is map. It returns undefined
-  // if `x` is not enumerable.
-  map: func(x, fn) {
-    if !is_enumerable(x) { return undefined }
-
-    dst := []
-    for k, v in x {
-      dst = append(dst, fn(k, v))
-    }
-
-    return dst
-  },
-  // key returns the first argument.
-  key: func(k, _) { return k },
-  // value returns the second argument.
-  value: func(_, v) { return v }
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/stdlib.go b/vendor/github.com/d5/tengo/stdlib/stdlib.go
deleted file mode 100644
index aad220ee..00000000
--- a/vendor/github.com/d5/tengo/stdlib/stdlib.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package stdlib
-
-//go:generate go run gensrcmods.go
-
-import "github.com/d5/tengo/objects"
-
-// AllModuleNames returns a list of all default module names.
-func AllModuleNames() []string {
-	var names []string
-	for name := range BuiltinModules {
-		names = append(names, name)
-	}
-	for name := range SourceModules {
-		names = append(names, name)
-	}
-	return names
-}
-
-// GetModuleMap returns the module map that includes all modules
-// for the given module names.
-func GetModuleMap(names ...string) *objects.ModuleMap {
-	modules := objects.NewModuleMap()
-
-	for _, name := range names {
-		if mod := BuiltinModules[name]; mod != nil {
-			modules.AddBuiltinModule(name, mod)
-		}
-		if mod := SourceModules[name]; mod != "" {
-			modules.AddSourceModule(name, []byte(mod))
-		}
-	}
-
-	return modules
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/text.go b/vendor/github.com/d5/tengo/stdlib/text.go
deleted file mode 100644
index 4b5729ec..00000000
--- a/vendor/github.com/d5/tengo/stdlib/text.go
+++ /dev/null
@@ -1,930 +0,0 @@
-package stdlib
-
-import (
-	"fmt"
-	"regexp"
-	"strconv"
-	"strings"
-	"unicode/utf8"
-
-	"github.com/d5/tengo"
-	"github.com/d5/tengo/objects"
-)
-
-var textModule = map[string]objects.Object{
-	"re_match":       &objects.UserFunction{Name: "re_match", Value: textREMatch},                           // re_match(pattern, text) => bool/error
-	"re_find":        &objects.UserFunction{Name: "re_find", Value: textREFind},                             // re_find(pattern, text, count) => [[{text:,begin:,end:}]]/undefined
-	"re_replace":     &objects.UserFunction{Name: "re_replace", Value: textREReplace},                       // re_replace(pattern, text, repl) => string/error
-	"re_split":       &objects.UserFunction{Name: "re_split", Value: textRESplit},                           // re_split(pattern, text, count) => [string]/error
-	"re_compile":     &objects.UserFunction{Name: "re_compile", Value: textRECompile},                       // re_compile(pattern) => Regexp/error
-	"compare":        &objects.UserFunction{Name: "compare", Value: FuncASSRI(strings.Compare)},             // compare(a, b) => int
-	"contains":       &objects.UserFunction{Name: "contains", Value: FuncASSRB(strings.Contains)},           // contains(s, substr) => bool
-	"contains_any":   &objects.UserFunction{Name: "contains_any", Value: FuncASSRB(strings.ContainsAny)},    // contains_any(s, chars) => bool
-	"count":          &objects.UserFunction{Name: "count", Value: FuncASSRI(strings.Count)},                 // count(s, substr) => int
-	"equal_fold":     &objects.UserFunction{Name: "equal_fold", Value: FuncASSRB(strings.EqualFold)},        // "equal_fold(s, t) => bool
-	"fields":         &objects.UserFunction{Name: "fields", Value: FuncASRSs(strings.Fields)},               // fields(s) => [string]
-	"has_prefix":     &objects.UserFunction{Name: "has_prefix", Value: FuncASSRB(strings.HasPrefix)},        // has_prefix(s, prefix) => bool
-	"has_suffix":     &objects.UserFunction{Name: "has_suffix", Value: FuncASSRB(strings.HasSuffix)},        // has_suffix(s, suffix) => bool
-	"index":          &objects.UserFunction{Name: "index", Value: FuncASSRI(strings.Index)},                 // index(s, substr) => int
-	"index_any":      &objects.UserFunction{Name: "index_any", Value: FuncASSRI(strings.IndexAny)},          // index_any(s, chars) => int
-	"join":           &objects.UserFunction{Name: "join", Value: textJoin},                                  // join(arr, sep) => string
-	"last_index":     &objects.UserFunction{Name: "last_index", Value: FuncASSRI(strings.LastIndex)},        // last_index(s, substr) => int
-	"last_index_any": &objects.UserFunction{Name: "last_index_any", Value: FuncASSRI(strings.LastIndexAny)}, // last_index_any(s, chars) => int
-	"repeat":         &objects.UserFunction{Name: "repeat", Value: textRepeat},                              // repeat(s, count) => string
-	"replace":        &objects.UserFunction{Name: "replace", Value: textReplace},                            // replace(s, old, new, n) => string
-	"substr":         &objects.UserFunction{Name: "substr", Value: textSubstring},                           // substr(s, lower, upper) => string
-	"split":          &objects.UserFunction{Name: "split", Value: FuncASSRSs(strings.Split)},                // split(s, sep) => [string]
-	"split_after":    &objects.UserFunction{Name: "split_after", Value: FuncASSRSs(strings.SplitAfter)},     // split_after(s, sep) => [string]
-	"split_after_n":  &objects.UserFunction{Name: "split_after_n", Value: FuncASSIRSs(strings.SplitAfterN)}, // split_after_n(s, sep, n) => [string]
-	"split_n":        &objects.UserFunction{Name: "split_n", Value: FuncASSIRSs(strings.SplitN)},            // split_n(s, sep, n) => [string]
-	"title":          &objects.UserFunction{Name: "title", Value: FuncASRS(strings.Title)},                  // title(s) => string
-	"to_lower":       &objects.UserFunction{Name: "to_lower", Value: FuncASRS(strings.ToLower)},             // to_lower(s) => string
-	"to_title":       &objects.UserFunction{Name: "to_title", Value: FuncASRS(strings.ToTitle)},             // to_title(s) => string
-	"to_upper":       &objects.UserFunction{Name: "to_upper", Value: FuncASRS(strings.ToUpper)},             // to_upper(s) => string
-	"pad_left":       &objects.UserFunction{Name: "pad_left", Value: textPadLeft},                           // pad_left(s, pad_len, pad_with) => string
-	"pad_right":      &objects.UserFunction{Name: "pad_right", Value: textPadRight},                         // pad_right(s, pad_len, pad_with) => string
-	"trim":           &objects.UserFunction{Name: "trim", Value: FuncASSRS(strings.Trim)},                   // trim(s, cutset) => string
-	"trim_left":      &objects.UserFunction{Name: "trim_left", Value: FuncASSRS(strings.TrimLeft)},          // trim_left(s, cutset) => string
-	"trim_prefix":    &objects.UserFunction{Name: "trim_prefix", Value: FuncASSRS(strings.TrimPrefix)},      // trim_prefix(s, prefix) => string
-	"trim_right":     &objects.UserFunction{Name: "trim_right", Value: FuncASSRS(strings.TrimRight)},        // trim_right(s, cutset) => string
-	"trim_space":     &objects.UserFunction{Name: "trim_space", Value: FuncASRS(strings.TrimSpace)},         // trim_space(s) => string
-	"trim_suffix":    &objects.UserFunction{Name: "trim_suffix", Value: FuncASSRS(strings.TrimSuffix)},      // trim_suffix(s, suffix) => string
-	"atoi":           &objects.UserFunction{Name: "atoi", Value: FuncASRIE(strconv.Atoi)},                   // atoi(str) => int/error
-	"format_bool":    &objects.UserFunction{Name: "format_bool", Value: textFormatBool},                     // format_bool(b) => string
-	"format_float":   &objects.UserFunction{Name: "format_float", Value: textFormatFloat},                   // format_float(f, fmt, prec, bits) => string
-	"format_int":     &objects.UserFunction{Name: "format_int", Value: textFormatInt},                       // format_int(i, base) => string
-	"itoa":           &objects.UserFunction{Name: "itoa", Value: FuncAIRS(strconv.Itoa)},                    // itoa(i) => string
-	"parse_bool":     &objects.UserFunction{Name: "parse_bool", Value: textParseBool},                       // parse_bool(str) => bool/error
-	"parse_float":    &objects.UserFunction{Name: "parse_float", Value: textParseFloat},                     // parse_float(str, bits) => float/error
-	"parse_int":      &objects.UserFunction{Name: "parse_int", Value: textParseInt},                         // parse_int(str, base, bits) => int/error
-	"quote":          &objects.UserFunction{Name: "quote", Value: FuncASRS(strconv.Quote)},                  // quote(str) => string
-	"unquote":        &objects.UserFunction{Name: "unquote", Value: FuncASRSE(strconv.Unquote)},             // unquote(str) => string/error
-}
-
-func textREMatch(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	matched, err := regexp.MatchString(s1, s2)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	if matched {
-		ret = objects.TrueValue
-	} else {
-		ret = objects.FalseValue
-	}
-
-	return
-}
-
-func textREFind(args ...objects.Object) (ret objects.Object, err error) {
-	numArgs := len(args)
-	if numArgs != 2 && numArgs != 3 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	re, err := regexp.Compile(s1)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	if numArgs < 3 {
-		m := re.FindStringSubmatchIndex(s2)
-		if m == nil {
-			ret = objects.UndefinedValue
-			return
-		}
-
-		arr := &objects.Array{}
-		for i := 0; i < len(m); i += 2 {
-			arr.Value = append(arr.Value, &objects.ImmutableMap{Value: map[string]objects.Object{
-				"text":  &objects.String{Value: s2[m[i]:m[i+1]]},
-				"begin": &objects.Int{Value: int64(m[i])},
-				"end":   &objects.Int{Value: int64(m[i+1])},
-			}})
-		}
-
-		ret = &objects.Array{Value: []objects.Object{arr}}
-
-		return
-	}
-
-	i3, ok := objects.ToInt(args[2])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "int(compatible)",
-			Found:    args[2].TypeName(),
-		}
-		return
-	}
-	m := re.FindAllStringSubmatchIndex(s2, i3)
-	if m == nil {
-		ret = objects.UndefinedValue
-		return
-	}
-
-	arr := &objects.Array{}
-	for _, m := range m {
-		subMatch := &objects.Array{}
-		for i := 0; i < len(m); i += 2 {
-			subMatch.Value = append(subMatch.Value, &objects.ImmutableMap{Value: map[string]objects.Object{
-				"text":  &objects.String{Value: s2[m[i]:m[i+1]]},
-				"begin": &objects.Int{Value: int64(m[i])},
-				"end":   &objects.Int{Value: int64(m[i+1])},
-			}})
-		}
-
-		arr.Value = append(arr.Value, subMatch)
-	}
-
-	ret = arr
-
-	return
-}
-
-func textREReplace(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 3 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	s3, ok := objects.ToString(args[2])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "string(compatible)",
-			Found:    args[2].TypeName(),
-		}
-		return
-	}
-
-	re, err := regexp.Compile(s1)
-	if err != nil {
-		ret = wrapError(err)
-	} else {
-		s, ok := doTextRegexpReplace(re, s2, s3)
-		if !ok {
-			return nil, objects.ErrStringLimit
-		}
-
-		ret = &objects.String{Value: s}
-	}
-
-	return
-}
-
-func textRESplit(args ...objects.Object) (ret objects.Object, err error) {
-	numArgs := len(args)
-	if numArgs != 2 && numArgs != 3 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	var i3 = -1
-	if numArgs > 2 {
-		i3, ok = objects.ToInt(args[2])
-		if !ok {
-			err = objects.ErrInvalidArgumentType{
-				Name:     "third",
-				Expected: "int(compatible)",
-				Found:    args[2].TypeName(),
-			}
-			return
-		}
-	}
-
-	re, err := regexp.Compile(s1)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	arr := &objects.Array{}
-	for _, s := range re.Split(s2, i3) {
-		arr.Value = append(arr.Value, &objects.String{Value: s})
-	}
-
-	ret = arr
-
-	return
-}
-
-func textRECompile(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	re, err := regexp.Compile(s1)
-	if err != nil {
-		ret = wrapError(err)
-	} else {
-		ret = makeTextRegexp(re)
-	}
-
-	return
-}
-
-func textReplace(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 4 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	s3, ok := objects.ToString(args[2])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "string(compatible)",
-			Found:    args[2].TypeName(),
-		}
-		return
-	}
-
-	i4, ok := objects.ToInt(args[3])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "fourth",
-			Expected: "int(compatible)",
-			Found:    args[3].TypeName(),
-		}
-		return
-	}
-
-	s, ok := doTextReplace(s1, s2, s3, i4)
-	if !ok {
-		err = objects.ErrStringLimit
-		return
-	}
-
-	ret = &objects.String{Value: s}
-
-	return
-}
-
-func textSubstring(args ...objects.Object) (ret objects.Object, err error) {
-	argslen := len(args)
-	if argslen != 2 && argslen != 3 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	strlen := len(s1)
-	i3 := strlen
-	if argslen == 3 {
-		i3, ok = objects.ToInt(args[2])
-		if !ok {
-			err = objects.ErrInvalidArgumentType{
-				Name:     "third",
-				Expected: "int(compatible)",
-				Found:    args[2].TypeName(),
-			}
-			return
-		}
-	}
-
-	if i2 > i3 {
-		err = objects.ErrInvalidIndexType
-		return
-	}
-
-	if i2 < 0 {
-		i2 = 0
-	} else if i2 > strlen {
-		i2 = strlen
-	}
-
-	if i3 < 0 {
-		i3 = 0
-	} else if i3 > strlen {
-		i3 = strlen
-	}
-
-	ret = &objects.String{Value: s1[i2:i3]}
-
-	return
-}
-
-func textPadLeft(args ...objects.Object) (ret objects.Object, err error) {
-	argslen := len(args)
-	if argslen != 2 && argslen != 3 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	if i2 > tengo.MaxStringLen {
-		return nil, objects.ErrStringLimit
-	}
-
-	sLen := len(s1)
-	if sLen >= i2 {
-		ret = &objects.String{Value: s1}
-		return
-	}
-
-	s3 := " "
-	if argslen == 3 {
-		s3, ok = objects.ToString(args[2])
-		if !ok {
-			err = objects.ErrInvalidArgumentType{
-				Name:     "third",
-				Expected: "string(compatible)",
-				Found:    args[2].TypeName(),
-			}
-			return
-		}
-	}
-
-	padStrLen := len(s3)
-	if padStrLen == 0 {
-		ret = &objects.String{Value: s1}
-		return
-	}
-
-	padCount := ((i2 - padStrLen) / padStrLen) + 1
-	retStr := strings.Repeat(s3, int(padCount)) + s1
-	ret = &objects.String{Value: retStr[len(retStr)-i2:]}
-
-	return
-}
-
-func textPadRight(args ...objects.Object) (ret objects.Object, err error) {
-	argslen := len(args)
-	if argslen != 2 && argslen != 3 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	if i2 > tengo.MaxStringLen {
-		return nil, objects.ErrStringLimit
-	}
-
-	sLen := len(s1)
-	if sLen >= i2 {
-		ret = &objects.String{Value: s1}
-		return
-	}
-
-	s3 := " "
-	if argslen == 3 {
-		s3, ok = objects.ToString(args[2])
-		if !ok {
-			err = objects.ErrInvalidArgumentType{
-				Name:     "third",
-				Expected: "string(compatible)",
-				Found:    args[2].TypeName(),
-			}
-			return
-		}
-	}
-
-	padStrLen := len(s3)
-	if padStrLen == 0 {
-		ret = &objects.String{Value: s1}
-		return
-	}
-
-	padCount := ((i2 - padStrLen) / padStrLen) + 1
-	retStr := s1 + strings.Repeat(s3, int(padCount))
-	ret = &objects.String{Value: retStr[:i2]}
-
-	return
-}
-
-func textRepeat(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-	}
-
-	if len(s1)*i2 > tengo.MaxStringLen {
-		return nil, objects.ErrStringLimit
-	}
-
-	return &objects.String{Value: strings.Repeat(s1, i2)}, nil
-}
-
-func textJoin(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		return nil, objects.ErrWrongNumArguments
-	}
-
-	var slen int
-	var ss1 []string
-	switch arg0 := args[0].(type) {
-	case *objects.Array:
-		for idx, a := range arg0.Value {
-			as, ok := objects.ToString(a)
-			if !ok {
-				return nil, objects.ErrInvalidArgumentType{
-					Name:     fmt.Sprintf("first[%d]", idx),
-					Expected: "string(compatible)",
-					Found:    a.TypeName(),
-				}
-			}
-			slen += len(as)
-			ss1 = append(ss1, as)
-		}
-	case *objects.ImmutableArray:
-		for idx, a := range arg0.Value {
-			as, ok := objects.ToString(a)
-			if !ok {
-				return nil, objects.ErrInvalidArgumentType{
-					Name:     fmt.Sprintf("first[%d]", idx),
-					Expected: "string(compatible)",
-					Found:    a.TypeName(),
-				}
-			}
-			slen += len(as)
-			ss1 = append(ss1, as)
-		}
-	default:
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "array",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		return nil, objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-	}
-
-	// make sure output length does not exceed the limit
-	if slen+len(s2)*(len(ss1)-1) > tengo.MaxStringLen {
-		return nil, objects.ErrStringLimit
-	}
-
-	return &objects.String{Value: strings.Join(ss1, s2)}, nil
-}
-
-func textFormatBool(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	b1, ok := args[0].(*objects.Bool)
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "bool",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	if b1 == objects.TrueValue {
-		ret = &objects.String{Value: "true"}
-	} else {
-		ret = &objects.String{Value: "false"}
-	}
-
-	return
-}
-
-func textFormatFloat(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 4 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	f1, ok := args[0].(*objects.Float)
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "float",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	i3, ok := objects.ToInt(args[2])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "int(compatible)",
-			Found:    args[2].TypeName(),
-		}
-		return
-	}
-
-	i4, ok := objects.ToInt(args[3])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "fourth",
-			Expected: "int(compatible)",
-			Found:    args[3].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.String{Value: strconv.FormatFloat(f1.Value, s2[0], i3, i4)}
-
-	return
-}
-
-func textFormatInt(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := args[0].(*objects.Int)
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.String{Value: strconv.FormatInt(i1.Value, i2)}
-
-	return
-}
-
-func textParseBool(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := args[0].(*objects.String)
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	parsed, err := strconv.ParseBool(s1.Value)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	if parsed {
-		ret = objects.TrueValue
-	} else {
-		ret = objects.FalseValue
-	}
-
-	return
-}
-
-func textParseFloat(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := args[0].(*objects.String)
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	parsed, err := strconv.ParseFloat(s1.Value, i2)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	ret = &objects.Float{Value: parsed}
-
-	return
-}
-
-func textParseInt(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 3 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := args[0].(*objects.String)
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	i3, ok := objects.ToInt(args[2])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "int(compatible)",
-			Found:    args[2].TypeName(),
-		}
-		return
-	}
-
-	parsed, err := strconv.ParseInt(s1.Value, i2, i3)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	ret = &objects.Int{Value: parsed}
-
-	return
-}
-
-// Modified implementation of strings.Replace
-// to limit the maximum length of output string.
-func doTextReplace(s, old, new string, n int) (string, bool) {
-	if old == new || n == 0 {
-		return s, true // avoid allocation
-	}
-
-	// Compute number of replacements.
-	if m := strings.Count(s, old); m == 0 {
-		return s, true // avoid allocation
-	} else if n < 0 || m < n {
-		n = m
-	}
-
-	// Apply replacements to buffer.
-	t := make([]byte, len(s)+n*(len(new)-len(old)))
-	w := 0
-	start := 0
-	for i := 0; i < n; i++ {
-		j := start
-		if len(old) == 0 {
-			if i > 0 {
-				_, wid := utf8.DecodeRuneInString(s[start:])
-				j += wid
-			}
-		} else {
-			j += strings.Index(s[start:], old)
-		}
-
-		ssj := s[start:j]
-		if w+len(ssj)+len(new) > tengo.MaxStringLen {
-			return "", false
-		}
-
-		w += copy(t[w:], ssj)
-		w += copy(t[w:], new)
-		start = j + len(old)
-	}
-
-	ss := s[start:]
-	if w+len(ss) > tengo.MaxStringLen {
-		return "", false
-	}
-
-	w += copy(t[w:], ss)
-
-	return string(t[0:w]), true
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/text_regexp.go b/vendor/github.com/d5/tengo/stdlib/text_regexp.go
deleted file mode 100644
index 16f135bf..00000000
--- a/vendor/github.com/d5/tengo/stdlib/text_regexp.go
+++ /dev/null
@@ -1,228 +0,0 @@
-package stdlib
-
-import (
-	"regexp"
-
-	"github.com/d5/tengo"
-	"github.com/d5/tengo/objects"
-)
-
-func makeTextRegexp(re *regexp.Regexp) *objects.ImmutableMap {
-	return &objects.ImmutableMap{
-		Value: map[string]objects.Object{
-			// match(text) => bool
-			"match": &objects.UserFunction{
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 1 {
-						err = objects.ErrWrongNumArguments
-						return
-					}
-
-					s1, ok := objects.ToString(args[0])
-					if !ok {
-						err = objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "string(compatible)",
-							Found:    args[0].TypeName(),
-						}
-						return
-					}
-
-					if re.MatchString(s1) {
-						ret = objects.TrueValue
-					} else {
-						ret = objects.FalseValue
-					}
-
-					return
-				},
-			},
-
-			// find(text) 			=> array(array({text:,begin:,end:}))/undefined
-			// find(text, maxCount) => array(array({text:,begin:,end:}))/undefined
-			"find": &objects.UserFunction{
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					numArgs := len(args)
-					if numArgs != 1 && numArgs != 2 {
-						err = objects.ErrWrongNumArguments
-						return
-					}
-
-					s1, ok := objects.ToString(args[0])
-					if !ok {
-						err = objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "string(compatible)",
-							Found:    args[0].TypeName(),
-						}
-						return
-					}
-
-					if numArgs == 1 {
-						m := re.FindStringSubmatchIndex(s1)
-						if m == nil {
-							ret = objects.UndefinedValue
-							return
-						}
-
-						arr := &objects.Array{}
-						for i := 0; i < len(m); i += 2 {
-							arr.Value = append(arr.Value, &objects.ImmutableMap{Value: map[string]objects.Object{
-								"text":  &objects.String{Value: s1[m[i]:m[i+1]]},
-								"begin": &objects.Int{Value: int64(m[i])},
-								"end":   &objects.Int{Value: int64(m[i+1])},
-							}})
-						}
-
-						ret = &objects.Array{Value: []objects.Object{arr}}
-
-						return
-					}
-
-					i2, ok := objects.ToInt(args[1])
-					if !ok {
-						err = objects.ErrInvalidArgumentType{
-							Name:     "second",
-							Expected: "int(compatible)",
-							Found:    args[1].TypeName(),
-						}
-						return
-					}
-					m := re.FindAllStringSubmatchIndex(s1, i2)
-					if m == nil {
-						ret = objects.UndefinedValue
-						return
-					}
-
-					arr := &objects.Array{}
-					for _, m := range m {
-						subMatch := &objects.Array{}
-						for i := 0; i < len(m); i += 2 {
-							subMatch.Value = append(subMatch.Value, &objects.ImmutableMap{Value: map[string]objects.Object{
-								"text":  &objects.String{Value: s1[m[i]:m[i+1]]},
-								"begin": &objects.Int{Value: int64(m[i])},
-								"end":   &objects.Int{Value: int64(m[i+1])},
-							}})
-						}
-
-						arr.Value = append(arr.Value, subMatch)
-					}
-
-					ret = arr
-
-					return
-				},
-			},
-
-			// replace(src, repl) => string
-			"replace": &objects.UserFunction{
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					if len(args) != 2 {
-						err = objects.ErrWrongNumArguments
-						return
-					}
-
-					s1, ok := objects.ToString(args[0])
-					if !ok {
-						err = objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "string(compatible)",
-							Found:    args[0].TypeName(),
-						}
-						return
-					}
-
-					s2, ok := objects.ToString(args[1])
-					if !ok {
-						err = objects.ErrInvalidArgumentType{
-							Name:     "second",
-							Expected: "string(compatible)",
-							Found:    args[1].TypeName(),
-						}
-						return
-					}
-
-					s, ok := doTextRegexpReplace(re, s1, s2)
-					if !ok {
-						return nil, objects.ErrStringLimit
-					}
-
-					ret = &objects.String{Value: s}
-
-					return
-				},
-			},
-
-			// split(text) 			 => array(string)
-			// split(text, maxCount) => array(string)
-			"split": &objects.UserFunction{
-				Value: func(args ...objects.Object) (ret objects.Object, err error) {
-					numArgs := len(args)
-					if numArgs != 1 && numArgs != 2 {
-						err = objects.ErrWrongNumArguments
-						return
-					}
-
-					s1, ok := objects.ToString(args[0])
-					if !ok {
-						err = objects.ErrInvalidArgumentType{
-							Name:     "first",
-							Expected: "string(compatible)",
-							Found:    args[0].TypeName(),
-						}
-						return
-					}
-
-					var i2 = -1
-					if numArgs > 1 {
-						i2, ok = objects.ToInt(args[1])
-						if !ok {
-							err = objects.ErrInvalidArgumentType{
-								Name:     "second",
-								Expected: "int(compatible)",
-								Found:    args[1].TypeName(),
-							}
-							return
-						}
-					}
-
-					arr := &objects.Array{}
-					for _, s := range re.Split(s1, i2) {
-						arr.Value = append(arr.Value, &objects.String{Value: s})
-					}
-
-					ret = arr
-
-					return
-				},
-			},
-		},
-	}
-}
-
-// Size-limit checking implementation of regexp.ReplaceAllString.
-func doTextRegexpReplace(re *regexp.Regexp, src, repl string) (string, bool) {
-	idx := 0
-	out := ""
-
-	for _, m := range re.FindAllStringSubmatchIndex(src, -1) {
-		var exp []byte
-		exp = re.ExpandString(exp, repl, src, m)
-
-		if len(out)+m[0]-idx+len(exp) > tengo.MaxStringLen {
-			return "", false
-		}
-
-		out += src[idx:m[0]] + string(exp)
-		idx = m[1]
-	}
-	if idx < len(src) {
-		if len(out)+len(src)-idx > tengo.MaxStringLen {
-			return "", false
-		}
-
-		out += src[idx:]
-	}
-
-	return string(out), true
-}
diff --git a/vendor/github.com/d5/tengo/stdlib/times.go b/vendor/github.com/d5/tengo/stdlib/times.go
deleted file mode 100644
index 111c877a..00000000
--- a/vendor/github.com/d5/tengo/stdlib/times.go
+++ /dev/null
@@ -1,989 +0,0 @@
-package stdlib
-
-import (
-	"time"
-
-	"github.com/d5/tengo"
-	"github.com/d5/tengo/objects"
-)
-
-var timesModule = map[string]objects.Object{
-	"format_ansic":         &objects.String{Value: time.ANSIC},
-	"format_unix_date":     &objects.String{Value: time.UnixDate},
-	"format_ruby_date":     &objects.String{Value: time.RubyDate},
-	"format_rfc822":        &objects.String{Value: time.RFC822},
-	"format_rfc822z":       &objects.String{Value: time.RFC822Z},
-	"format_rfc850":        &objects.String{Value: time.RFC850},
-	"format_rfc1123":       &objects.String{Value: time.RFC1123},
-	"format_rfc1123z":      &objects.String{Value: time.RFC1123Z},
-	"format_rfc3339":       &objects.String{Value: time.RFC3339},
-	"format_rfc3339_nano":  &objects.String{Value: time.RFC3339Nano},
-	"format_kitchen":       &objects.String{Value: time.Kitchen},
-	"format_stamp":         &objects.String{Value: time.Stamp},
-	"format_stamp_milli":   &objects.String{Value: time.StampMilli},
-	"format_stamp_micro":   &objects.String{Value: time.StampMicro},
-	"format_stamp_nano":    &objects.String{Value: time.StampNano},
-	"nanosecond":           &objects.Int{Value: int64(time.Nanosecond)},
-	"microsecond":          &objects.Int{Value: int64(time.Microsecond)},
-	"millisecond":          &objects.Int{Value: int64(time.Millisecond)},
-	"second":               &objects.Int{Value: int64(time.Second)},
-	"minute":               &objects.Int{Value: int64(time.Minute)},
-	"hour":                 &objects.Int{Value: int64(time.Hour)},
-	"january":              &objects.Int{Value: int64(time.January)},
-	"february":             &objects.Int{Value: int64(time.February)},
-	"march":                &objects.Int{Value: int64(time.March)},
-	"april":                &objects.Int{Value: int64(time.April)},
-	"may":                  &objects.Int{Value: int64(time.May)},
-	"june":                 &objects.Int{Value: int64(time.June)},
-	"july":                 &objects.Int{Value: int64(time.July)},
-	"august":               &objects.Int{Value: int64(time.August)},
-	"september":            &objects.Int{Value: int64(time.September)},
-	"october":              &objects.Int{Value: int64(time.October)},
-	"november":             &objects.Int{Value: int64(time.November)},
-	"december":             &objects.Int{Value: int64(time.December)},
-	"sleep":                &objects.UserFunction{Name: "sleep", Value: timesSleep},                              // sleep(int)
-	"parse_duration":       &objects.UserFunction{Name: "parse_duration", Value: timesParseDuration},             // parse_duration(str) => int
-	"since":                &objects.UserFunction{Name: "since", Value: timesSince},                              // since(time) => int
-	"until":                &objects.UserFunction{Name: "until", Value: timesUntil},                              // until(time) => int
-	"duration_hours":       &objects.UserFunction{Name: "duration_hours", Value: timesDurationHours},             // duration_hours(int) => float
-	"duration_minutes":     &objects.UserFunction{Name: "duration_minutes", Value: timesDurationMinutes},         // duration_minutes(int) => float
-	"duration_nanoseconds": &objects.UserFunction{Name: "duration_nanoseconds", Value: timesDurationNanoseconds}, // duration_nanoseconds(int) => int
-	"duration_seconds":     &objects.UserFunction{Name: "duration_seconds", Value: timesDurationSeconds},         // duration_seconds(int) => float
-	"duration_string":      &objects.UserFunction{Name: "duration_string", Value: timesDurationString},           // duration_string(int) => string
-	"month_string":         &objects.UserFunction{Name: "month_string", Value: timesMonthString},                 // month_string(int) => string
-	"date":                 &objects.UserFunction{Name: "date", Value: timesDate},                                // date(year, month, day, hour, min, sec, nsec) => time
-	"now":                  &objects.UserFunction{Name: "now", Value: timesNow},                                  // now() => time
-	"parse":                &objects.UserFunction{Name: "parse", Value: timesParse},                              // parse(format, str) => time
-	"unix":                 &objects.UserFunction{Name: "unix", Value: timesUnix},                                // unix(sec, nsec) => time
-	"add":                  &objects.UserFunction{Name: "add", Value: timesAdd},                                  // add(time, int) => time
-	"add_date":             &objects.UserFunction{Name: "add_date", Value: timesAddDate},                         // add_date(time, years, months, days) => time
-	"sub":                  &objects.UserFunction{Name: "sub", Value: timesSub},                                  // sub(t time, u time) => int
-	"after":                &objects.UserFunction{Name: "after", Value: timesAfter},                              // after(t time, u time) => bool
-	"before":               &objects.UserFunction{Name: "before", Value: timesBefore},                            // before(t time, u time) => bool
-	"time_year":            &objects.UserFunction{Name: "time_year", Value: timesTimeYear},                       // time_year(time) => int
-	"time_month":           &objects.UserFunction{Name: "time_month", Value: timesTimeMonth},                     // time_month(time) => int
-	"time_day":             &objects.UserFunction{Name: "time_day", Value: timesTimeDay},                         // time_day(time) => int
-	"time_weekday":         &objects.UserFunction{Name: "time_weekday", Value: timesTimeWeekday},                 // time_weekday(time) => int
-	"time_hour":            &objects.UserFunction{Name: "time_hour", Value: timesTimeHour},                       // time_hour(time) => int
-	"time_minute":          &objects.UserFunction{Name: "time_minute", Value: timesTimeMinute},                   // time_minute(time) => int
-	"time_second":          &objects.UserFunction{Name: "time_second", Value: timesTimeSecond},                   // time_second(time) => int
-	"time_nanosecond":      &objects.UserFunction{Name: "time_nanosecond", Value: timesTimeNanosecond},           // time_nanosecond(time) => int
-	"time_unix":            &objects.UserFunction{Name: "time_unix", Value: timesTimeUnix},                       // time_unix(time) => int
-	"time_unix_nano":       &objects.UserFunction{Name: "time_unix_nano", Value: timesTimeUnixNano},              // time_unix_nano(time) => int
-	"time_format":          &objects.UserFunction{Name: "time_format", Value: timesTimeFormat},                   // time_format(time, format) => string
-	"time_location":        &objects.UserFunction{Name: "time_location", Value: timesTimeLocation},               // time_location(time) => string
-	"time_string":          &objects.UserFunction{Name: "time_string", Value: timesTimeString},                   // time_string(time) => string
-	"is_zero":              &objects.UserFunction{Name: "is_zero", Value: timesIsZero},                           // is_zero(time) => bool
-	"to_local":             &objects.UserFunction{Name: "to_local", Value: timesToLocal},                         // to_local(time) => time
-	"to_utc":               &objects.UserFunction{Name: "to_utc", Value: timesToUTC},                             // to_utc(time) => time
-}
-
-func timesSleep(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	time.Sleep(time.Duration(i1))
-	ret = objects.UndefinedValue
-
-	return
-}
-
-func timesParseDuration(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	dur, err := time.ParseDuration(s1)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	ret = &objects.Int{Value: int64(dur)}
-
-	return
-}
-
-func timesSince(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(time.Since(t1))}
-
-	return
-}
-
-func timesUntil(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(time.Until(t1))}
-
-	return
-}
-
-func timesDurationHours(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Float{Value: time.Duration(i1).Hours()}
-
-	return
-}
-
-func timesDurationMinutes(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Float{Value: time.Duration(i1).Minutes()}
-
-	return
-}
-
-func timesDurationNanoseconds(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: time.Duration(i1).Nanoseconds()}
-
-	return
-}
-
-func timesDurationSeconds(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Float{Value: time.Duration(i1).Seconds()}
-
-	return
-}
-
-func timesDurationString(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.String{Value: time.Duration(i1).String()}
-
-	return
-}
-
-func timesMonthString(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.String{Value: time.Month(i1).String()}
-
-	return
-}
-
-func timesDate(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 7 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-	i3, ok := objects.ToInt(args[2])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "int(compatible)",
-			Found:    args[2].TypeName(),
-		}
-		return
-	}
-	i4, ok := objects.ToInt(args[3])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "fourth",
-			Expected: "int(compatible)",
-			Found:    args[3].TypeName(),
-		}
-		return
-	}
-	i5, ok := objects.ToInt(args[4])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "fifth",
-			Expected: "int(compatible)",
-			Found:    args[4].TypeName(),
-		}
-		return
-	}
-	i6, ok := objects.ToInt(args[5])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "sixth",
-			Expected: "int(compatible)",
-			Found:    args[5].TypeName(),
-		}
-		return
-	}
-	i7, ok := objects.ToInt(args[6])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "seventh",
-			Expected: "int(compatible)",
-			Found:    args[6].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Time{Value: time.Date(i1, time.Month(i2), i3, i4, i5, i6, i7, time.Now().Location())}
-
-	return
-}
-
-func timesNow(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 0 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	ret = &objects.Time{Value: time.Now()}
-
-	return
-}
-
-func timesParse(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	s1, ok := objects.ToString(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "string(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	parsed, err := time.Parse(s1, s2)
-	if err != nil {
-		ret = wrapError(err)
-		return
-	}
-
-	ret = &objects.Time{Value: parsed}
-
-	return
-}
-
-func timesUnix(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	i1, ok := objects.ToInt64(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "int(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt64(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Time{Value: time.Unix(i1, i2)}
-
-	return
-}
-
-func timesAdd(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt64(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Time{Value: t1.Add(time.Duration(i2))}
-
-	return
-}
-
-func timesSub(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	t2, ok := objects.ToTime(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "time(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Sub(t2))}
-
-	return
-}
-
-func timesAddDate(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 4 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	i2, ok := objects.ToInt(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "int(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	i3, ok := objects.ToInt(args[2])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "third",
-			Expected: "int(compatible)",
-			Found:    args[2].TypeName(),
-		}
-		return
-	}
-
-	i4, ok := objects.ToInt(args[3])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "fourth",
-			Expected: "int(compatible)",
-			Found:    args[3].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Time{Value: t1.AddDate(i2, i3, i4)}
-
-	return
-}
-
-func timesAfter(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	t2, ok := objects.ToTime(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "time(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	if t1.After(t2) {
-		ret = objects.TrueValue
-	} else {
-		ret = objects.FalseValue
-	}
-
-	return
-}
-
-func timesBefore(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	t2, ok := objects.ToTime(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	if t1.Before(t2) {
-		ret = objects.TrueValue
-	} else {
-		ret = objects.FalseValue
-	}
-
-	return
-}
-
-func timesTimeYear(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Year())}
-
-	return
-}
-
-func timesTimeMonth(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Month())}
-
-	return
-}
-
-func timesTimeDay(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Day())}
-
-	return
-}
-
-func timesTimeWeekday(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Weekday())}
-
-	return
-}
-
-func timesTimeHour(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Hour())}
-
-	return
-}
-
-func timesTimeMinute(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Minute())}
-
-	return
-}
-
-func timesTimeSecond(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Second())}
-
-	return
-}
-
-func timesTimeNanosecond(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Nanosecond())}
-
-	return
-}
-
-func timesTimeUnix(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.Unix())}
-
-	return
-}
-
-func timesTimeUnixNano(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Int{Value: int64(t1.UnixNano())}
-
-	return
-}
-
-func timesTimeFormat(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 2 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	s2, ok := objects.ToString(args[1])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "second",
-			Expected: "string(compatible)",
-			Found:    args[1].TypeName(),
-		}
-		return
-	}
-
-	s := t1.Format(s2)
-	if len(s) > tengo.MaxStringLen {
-
-		return nil, objects.ErrStringLimit
-	}
-
-	ret = &objects.String{Value: s}
-
-	return
-}
-
-func timesIsZero(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	if t1.IsZero() {
-		ret = objects.TrueValue
-	} else {
-		ret = objects.FalseValue
-	}
-
-	return
-}
-
-func timesToLocal(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Time{Value: t1.Local()}
-
-	return
-}
-
-func timesToUTC(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.Time{Value: t1.UTC()}
-
-	return
-}
-
-func timesTimeLocation(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.String{Value: t1.Location().String()}
-
-	return
-}
-
-func timesTimeString(args ...objects.Object) (ret objects.Object, err error) {
-	if len(args) != 1 {
-		err = objects.ErrWrongNumArguments
-		return
-	}
-
-	t1, ok := objects.ToTime(args[0])
-	if !ok {
-		err = objects.ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "time(compatible)",
-			Found:    args[0].TypeName(),
-		}
-		return
-	}
-
-	ret = &objects.String{Value: t1.String()}
-
-	return
-}