Update tengo vendor and load the stdlib. Fixes #789 (#792)

19 files changed, 309 insertions, 320 deletions

diff --git a/vendor/github.com/d5/tengo/objects/break.go b/vendor/github.com/d5/tengo/objects/break.go
deleted file mode 100644
index cd473a87..00000000
--- a/vendor/github.com/d5/tengo/objects/break.go
+++ /dev/null
@@ -1,37 +0,0 @@
-package objects
-
-import "github.com/d5/tengo/compiler/token"
-
-// Break represents a break statement.
-type Break struct{}
-
-// TypeName returns the name of the type.
-func (o *Break) TypeName() string {
-	return "break"
-}
-
-func (o *Break) String() string {
-	return "<break>"
-}
-
-// BinaryOp returns another object that is the result of
-// a given binary operator and a right-hand side object.
-func (o *Break) BinaryOp(op token.Token, rhs Object) (Object, error) {
-	return nil, ErrInvalidOperator
-}
-
-// Copy returns a copy of the type.
-func (o *Break) Copy() Object {
-	return &Break{}
-}
-
-// IsFalsy returns true if the value of the type is falsy.
-func (o *Break) IsFalsy() bool {
-	return false
-}
-
-// Equals returns true if the value of the type
-// is equal to the value of another object.
-func (o *Break) Equals(x Object) bool {
-	return false
-}
diff --git a/vendor/github.com/d5/tengo/objects/builtin_json.go b/vendor/github.com/d5/tengo/objects/builtin_json.go
deleted file mode 100644
index b3413651..00000000
--- a/vendor/github.com/d5/tengo/objects/builtin_json.go
+++ /dev/null
@@ -1,60 +0,0 @@
-package objects
-
-import (
-	"encoding/json"
-
-	"github.com/d5/tengo"
-)
-
-// to_json(v object) => bytes
-func builtinToJSON(args ...Object) (Object, error) {
-	if len(args) != 1 {
-		return nil, ErrWrongNumArguments
-	}
-
-	res, err := json.Marshal(objectToInterface(args[0]))
-	if err != nil {
-		return &Error{Value: &String{Value: err.Error()}}, nil
-	}
-
-	if len(res) > tengo.MaxBytesLen {
-		return nil, ErrBytesLimit
-	}
-
-	return &Bytes{Value: res}, nil
-}
-
-// from_json(data string/bytes) => object
-func builtinFromJSON(args ...Object) (Object, error) {
-	if len(args) != 1 {
-		return nil, ErrWrongNumArguments
-	}
-
-	var target interface{}
-
-	switch o := args[0].(type) {
-	case *Bytes:
-		err := json.Unmarshal(o.Value, &target)
-		if err != nil {
-			return &Error{Value: &String{Value: err.Error()}}, nil
-		}
-	case *String:
-		err := json.Unmarshal([]byte(o.Value), &target)
-		if err != nil {
-			return &Error{Value: &String{Value: err.Error()}}, nil
-		}
-	default:
-		return nil, ErrInvalidArgumentType{
-			Name:     "first",
-			Expected: "bytes/string",
-			Found:    args[0].TypeName(),
-		}
-	}
-
-	res, err := FromInterface(target)
-	if err != nil {
-		return nil, err
-	}
-
-	return res, nil
-}
diff --git a/vendor/github.com/d5/tengo/objects/builtin_module.go b/vendor/github.com/d5/tengo/objects/builtin_module.go
new file mode 100644
index 00000000..0ad1d99d
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/builtin_module.go
@@ -0,0 +1,23 @@
+package objects
+
+// BuiltinModule is an importable module that's written in Go.
+type BuiltinModule struct {
+	Attrs map[string]Object
+}
+
+// Import returns an immutable map for the module.
+func (m *BuiltinModule) Import(moduleName string) (interface{}, error) {
+	return m.AsImmutableMap(moduleName), nil
+}
+
+// AsImmutableMap converts builtin module into an immutable map.
+func (m *BuiltinModule) AsImmutableMap(moduleName string) *ImmutableMap {
+	attrs := make(map[string]Object, len(m.Attrs))
+	for k, v := range m.Attrs {
+		attrs[k] = v.Copy()
+	}
+
+	attrs["__module_name__"] = &String{Value: moduleName}
+
+	return &ImmutableMap{Value: attrs}
+}
diff --git a/vendor/github.com/d5/tengo/objects/builtin_print.go b/vendor/github.com/d5/tengo/objects/builtin_print.go
deleted file mode 100644
index 58f22610..00000000
--- a/vendor/github.com/d5/tengo/objects/builtin_print.go
+++ /dev/null
@@ -1,83 +0,0 @@
-package objects
-
-import (
-	"fmt"
-
-	"github.com/d5/tengo"
-)
-
-// print(args...)
-func builtinPrint(args ...Object) (Object, error) {
-	for _, arg := range args {
-		if str, ok := arg.(*String); ok {
-			fmt.Println(str.Value)
-		} else {
-			fmt.Println(arg.String())
-		}
-	}
-
-	return nil, nil
-}
-
-// printf("format", args...)
-func builtinPrintf(args ...Object) (Object, error) {
-	numArgs := len(args)
-	if numArgs == 0 {
-		return nil, ErrWrongNumArguments
-	}
-
-	format, ok := args[0].(*String)
-	if !ok {
-		return nil, ErrInvalidArgumentType{
-			Name:     "format",
-			Expected: "string",
-			Found:    args[0].TypeName(),
-		}
-	}
-	if numArgs == 1 {
-		fmt.Print(format)
-		return nil, nil
-	}
-
-	formatArgs := make([]interface{}, numArgs-1, numArgs-1)
-	for idx, arg := range args[1:] {
-		formatArgs[idx] = objectToInterface(arg)
-	}
-
-	fmt.Printf(format.Value, formatArgs...)
-
-	return nil, nil
-}
-
-// sprintf("format", args...)
-func builtinSprintf(args ...Object) (Object, error) {
-	numArgs := len(args)
-	if numArgs == 0 {
-		return nil, ErrWrongNumArguments
-	}
-
-	format, ok := args[0].(*String)
-	if !ok {
-		return nil, ErrInvalidArgumentType{
-			Name:     "format",
-			Expected: "string",
-			Found:    args[0].TypeName(),
-		}
-	}
-	if numArgs == 1 {
-		return format, nil // okay to return 'format' directly as String is immutable
-	}
-
-	formatArgs := make([]interface{}, numArgs-1, numArgs-1)
-	for idx, arg := range args[1:] {
-		formatArgs[idx] = objectToInterface(arg)
-	}
-
-	s := fmt.Sprintf(format.Value, formatArgs...)
-
-	if len(s) > tengo.MaxStringLen {
-		return nil, ErrStringLimit
-	}
-
-	return &String{Value: s}, nil
-}
diff --git a/vendor/github.com/d5/tengo/objects/builtin_type_checks.go b/vendor/github.com/d5/tengo/objects/builtin_type_checks.go
index 960f7828..d1e8471d 100644
--- a/vendor/github.com/d5/tengo/objects/builtin_type_checks.go
+++ b/vendor/github.com/d5/tengo/objects/builtin_type_checks.go
@@ -181,3 +181,15 @@ func builtinIsCallable(args ...Object) (Object, error) {
 
 	return FalseValue, nil
 }
+
+func builtinIsIterable(args ...Object) (Object, error) {
+	if len(args) != 1 {
+		return nil, ErrWrongNumArguments
+	}
+
+	if _, ok := args[0].(Iterable); ok {
+		return TrueValue, nil
+	}
+
+	return FalseValue, nil
+}
diff --git a/vendor/github.com/d5/tengo/objects/builtins.go b/vendor/github.com/d5/tengo/objects/builtins.go
index 42c1a759..bfd004dd 100644
--- a/vendor/github.com/d5/tengo/objects/builtins.go
+++ b/vendor/github.com/d5/tengo/objects/builtins.go
@@ -2,19 +2,7 @@ package objects
 
 // Builtins contains all default builtin functions.
 // Use GetBuiltinFunctions instead of accessing Builtins directly.
-var Builtins = []BuiltinFunction{
-	{
-		Name:  "print",
-		Value: builtinPrint,
-	},
-	{
-		Name:  "printf",
-		Value: builtinPrintf,
-	},
-	{
-		Name:  "sprintf",
-		Value: builtinSprintf,
-	},
+var Builtins = []*BuiltinFunction{
 	{
 		Name:  "len",
 		Value: builtinLen,
@@ -96,6 +84,10 @@ var Builtins = []BuiltinFunction{
 		Value: builtinIsImmutableMap,
 	},
 	{
+		Name:  "is_iterable",
+		Value: builtinIsIterable,
+	},
+	{
 		Name:  "is_time",
 		Value: builtinIsTime,
 	},
@@ -116,49 +108,7 @@ var Builtins = []BuiltinFunction{
 		Value: builtinIsCallable,
 	},
 	{
-		Name:  "to_json",
-		Value: builtinToJSON,
-	},
-	{
-		Name:  "from_json",
-		Value: builtinFromJSON,
-	},
-	{
 		Name:  "type_name",
 		Value: builtinTypeName,
 	},
 }
-
-// AllBuiltinFunctionNames returns a list of all default builtin function names.
-func AllBuiltinFunctionNames() []string {
-	var names []string
-	for _, bf := range Builtins {
-		names = append(names, bf.Name)
-	}
-	return names
-}
-
-// GetBuiltinFunctions returns a slice of builtin function objects.
-// GetBuiltinFunctions removes the duplicate names, and, the returned builtin functions
-// are not guaranteed to be in the same order as names.
-func GetBuiltinFunctions(names ...string) []*BuiltinFunction {
-	include := make(map[string]bool)
-	for _, name := range names {
-		include[name] = true
-	}
-
-	var builtinFuncs []*BuiltinFunction
-	for _, bf := range Builtins {
-		if include[bf.Name] {
-			bf := bf
-			builtinFuncs = append(builtinFuncs, &bf)
-		}
-	}
-
-	return builtinFuncs
-}
-
-// GetAllBuiltinFunctions returns all builtin functions.
-func GetAllBuiltinFunctions() []*BuiltinFunction {
-	return GetBuiltinFunctions(AllBuiltinFunctionNames()...)
-}
diff --git a/vendor/github.com/d5/tengo/objects/bytes.go b/vendor/github.com/d5/tengo/objects/bytes.go
index 16b61684..6710c7c1 100644
--- a/vendor/github.com/d5/tengo/objects/bytes.go
+++ b/vendor/github.com/d5/tengo/objects/bytes.go
@@ -79,3 +79,11 @@ func (o *Bytes) IndexGet(index Object) (res Object, err error) {
 
 	return
 }
+
+// Iterate creates a bytes iterator.
+func (o *Bytes) Iterate() Iterator {
+	return &BytesIterator{
+		v: o.Value,
+		l: len(o.Value),
+	}
+}
diff --git a/vendor/github.com/d5/tengo/objects/bytes_iterator.go b/vendor/github.com/d5/tengo/objects/bytes_iterator.go
new file mode 100644
index 00000000..18a36e17
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/bytes_iterator.go
@@ -0,0 +1,57 @@
+package objects
+
+import "github.com/d5/tengo/compiler/token"
+
+// BytesIterator represents an iterator for a string.
+type BytesIterator struct {
+	v []byte
+	i int
+	l int
+}
+
+// TypeName returns the name of the type.
+func (i *BytesIterator) TypeName() string {
+	return "bytes-iterator"
+}
+
+func (i *BytesIterator) String() string {
+	return "<bytes-iterator>"
+}
+
+// BinaryOp returns another object that is the result of
+// a given binary operator and a right-hand side object.
+func (i *BytesIterator) BinaryOp(op token.Token, rhs Object) (Object, error) {
+	return nil, ErrInvalidOperator
+}
+
+// IsFalsy returns true if the value of the type is falsy.
+func (i *BytesIterator) IsFalsy() bool {
+	return true
+}
+
+// Equals returns true if the value of the type
+// is equal to the value of another object.
+func (i *BytesIterator) Equals(Object) bool {
+	return false
+}
+
+// Copy returns a copy of the type.
+func (i *BytesIterator) Copy() Object {
+	return &BytesIterator{v: i.v, i: i.i, l: i.l}
+}
+
+// Next returns true if there are more elements to iterate.
+func (i *BytesIterator) Next() bool {
+	i.i++
+	return i.i <= i.l
+}
+
+// Key returns the key or index value of the current element.
+func (i *BytesIterator) Key() Object {
+	return &Int{Value: int64(i.i - 1)}
+}
+
+// Value returns the value of the current element.
+func (i *BytesIterator) Value() Object {
+	return &Int{Value: int64(i.v[i.i-1])}
+}
diff --git a/vendor/github.com/d5/tengo/objects/closure.go b/vendor/github.com/d5/tengo/objects/closure.go
index d4915a52..06058b23 100644
--- a/vendor/github.com/d5/tengo/objects/closure.go
+++ b/vendor/github.com/d5/tengo/objects/closure.go
@@ -7,7 +7,7 @@ import (
 // Closure represents a function closure.
 type Closure struct {
 	Fn   *CompiledFunction
-	Free []*Object
+	Free []*ObjectPtr
 }
 
 // TypeName returns the name of the type.
@@ -29,7 +29,7 @@ func (o *Closure) BinaryOp(op token.Token, rhs Object) (Object, error) {
 func (o *Closure) Copy() Object {
 	return &Closure{
 		Fn:   o.Fn.Copy().(*CompiledFunction),
-		Free: append([]*Object{}, o.Free...), // DO NOT Copy() of elements; these are variable pointers
+		Free: append([]*ObjectPtr{}, o.Free...), // DO NOT Copy() of elements; these are variable pointers
 	}
 }
 
diff --git a/vendor/github.com/d5/tengo/objects/compiled_function.go b/vendor/github.com/d5/tengo/objects/compiled_function.go
index d20f2375..606e3d90 100644
--- a/vendor/github.com/d5/tengo/objects/compiled_function.go
+++ b/vendor/github.com/d5/tengo/objects/compiled_function.go
@@ -47,3 +47,14 @@ func (o *CompiledFunction) IsFalsy() bool {
 func (o *CompiledFunction) Equals(x Object) bool {
 	return false
 }
+
+// SourcePos returns the source position of the instruction at ip.
+func (o *CompiledFunction) SourcePos(ip int) source.Pos {
+	for ip >= 0 {
+		if p, ok := o.SourceMap[ip]; ok {
+			return p
+		}
+		ip--
+	}
+	return source.NoPos
+}
diff --git a/vendor/github.com/d5/tengo/objects/continue.go b/vendor/github.com/d5/tengo/objects/continue.go
deleted file mode 100644
index 8094e686..00000000
--- a/vendor/github.com/d5/tengo/objects/continue.go
+++ /dev/null
@@ -1,38 +0,0 @@
-package objects
-
-import "github.com/d5/tengo/compiler/token"
-
-// Continue represents a continue statement.
-type Continue struct {
-}
-
-// TypeName returns the name of the type.
-func (o *Continue) TypeName() string {
-	return "continue"
-}
-
-func (o *Continue) String() string {
-	return "<continue>"
-}
-
-// BinaryOp returns another object that is the result of
-// a given binary operator and a right-hand side object.
-func (o *Continue) BinaryOp(op token.Token, rhs Object) (Object, error) {
-	return nil, ErrInvalidOperator
-}
-
-// Copy returns a copy of the type.
-func (o *Continue) Copy() Object {
-	return &Continue{}
-}
-
-// IsFalsy returns true if the value of the type is falsy.
-func (o *Continue) IsFalsy() bool {
-	return false
-}
-
-// Equals returns true if the value of the type
-// is equal to the value of another object.
-func (o *Continue) Equals(x Object) bool {
-	return false
-}
diff --git a/vendor/github.com/d5/tengo/objects/conversion.go b/vendor/github.com/d5/tengo/objects/conversion.go
index 714f2617..d7cb3a03 100644
--- a/vendor/github.com/d5/tengo/objects/conversion.go
+++ b/vendor/github.com/d5/tengo/objects/conversion.go
@@ -1,6 +1,7 @@
 package objects
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"time"
@@ -158,8 +159,8 @@ func ToTime(o Object) (v time.Time, ok bool) {
 	return
 }
 
-// objectToInterface attempts to convert an object o to an interface{} value
-func objectToInterface(o Object) (res interface{}) {
+// ToInterface attempts to convert an object o to an interface{} value
+func ToInterface(o Object) (res interface{}) {
 	switch o := o.(type) {
 	case *Int:
 		res = o.Value
@@ -176,13 +177,29 @@ func objectToInterface(o Object) (res interface{}) {
 	case *Array:
 		res = make([]interface{}, len(o.Value))
 		for i, val := range o.Value {
-			res.([]interface{})[i] = objectToInterface(val)
+			res.([]interface{})[i] = ToInterface(val)
+		}
+	case *ImmutableArray:
+		res = make([]interface{}, len(o.Value))
+		for i, val := range o.Value {
+			res.([]interface{})[i] = ToInterface(val)
 		}
 	case *Map:
 		res = make(map[string]interface{})
 		for key, v := range o.Value {
-			res.(map[string]interface{})[key] = objectToInterface(v)
+			res.(map[string]interface{})[key] = ToInterface(v)
+		}
+	case *ImmutableMap:
+		res = make(map[string]interface{})
+		for key, v := range o.Value {
+			res.(map[string]interface{})[key] = ToInterface(v)
 		}
+	case *Time:
+		res = o.Value
+	case *Error:
+		res = errors.New(o.String())
+	case *Undefined:
+		res = nil
 	case Object:
 		return o
 	}
diff --git a/vendor/github.com/d5/tengo/objects/count_objects.go b/vendor/github.com/d5/tengo/objects/count_objects.go
new file mode 100644
index 00000000..8c482eb3
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/count_objects.go
@@ -0,0 +1,31 @@
+package objects
+
+// CountObjects returns the number of objects that a given object o contains.
+// For scalar value types, it will always be 1. For compound value types,
+// this will include its elements and all of their elements recursively.
+func CountObjects(o Object) (c int) {
+	c = 1
+
+	switch o := o.(type) {
+	case *Array:
+		for _, v := range o.Value {
+			c += CountObjects(v)
+		}
+	case *ImmutableArray:
+		for _, v := range o.Value {
+			c += CountObjects(v)
+		}
+	case *Map:
+		for _, v := range o.Value {
+			c += CountObjects(v)
+		}
+	case *ImmutableMap:
+		for _, v := range o.Value {
+			c += CountObjects(v)
+		}
+	case *Error:
+		c += CountObjects(o.Value)
+	}
+
+	return
+}
diff --git a/vendor/github.com/d5/tengo/objects/importable.go b/vendor/github.com/d5/tengo/objects/importable.go
new file mode 100644
index 00000000..9fd86ae8
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/importable.go
@@ -0,0 +1,7 @@
+package objects
+
+// Importable interface represents importable module instance.
+type Importable interface {
+	// Import should return either an Object or module source code ([]byte).
+	Import(moduleName string) (interface{}, error)
+}
diff --git a/vendor/github.com/d5/tengo/objects/module_map.go b/vendor/github.com/d5/tengo/objects/module_map.go
new file mode 100644
index 00000000..874b8a2b
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/module_map.go
@@ -0,0 +1,77 @@
+package objects
+
+// ModuleMap represents a set of named modules.
+// Use NewModuleMap to create a new module map.
+type ModuleMap struct {
+	m map[string]Importable
+}
+
+// NewModuleMap creates a new module map.
+func NewModuleMap() *ModuleMap {
+	return &ModuleMap{
+		m: make(map[string]Importable),
+	}
+}
+
+// Add adds an import module.
+func (m *ModuleMap) Add(name string, module Importable) {
+	m.m[name] = module
+}
+
+// AddBuiltinModule adds a builtin module.
+func (m *ModuleMap) AddBuiltinModule(name string, attrs map[string]Object) {
+	m.m[name] = &BuiltinModule{Attrs: attrs}
+}
+
+// AddSourceModule adds a source module.
+func (m *ModuleMap) AddSourceModule(name string, src []byte) {
+	m.m[name] = &SourceModule{Src: src}
+}
+
+// Remove removes a named module.
+func (m *ModuleMap) Remove(name string) {
+	delete(m.m, name)
+}
+
+// Get returns an import module identified by name.
+// It returns if the name is not found.
+func (m *ModuleMap) Get(name string) Importable {
+	return m.m[name]
+}
+
+// GetBuiltinModule returns a builtin module identified by name.
+// It returns if the name is not found or the module is not a builtin module.
+func (m *ModuleMap) GetBuiltinModule(name string) *BuiltinModule {
+	mod, _ := m.m[name].(*BuiltinModule)
+	return mod
+}
+
+// GetSourceModule returns a source module identified by name.
+// It returns if the name is not found or the module is not a source module.
+func (m *ModuleMap) GetSourceModule(name string) *SourceModule {
+	mod, _ := m.m[name].(*SourceModule)
+	return mod
+}
+
+// Copy creates a copy of the module map.
+func (m *ModuleMap) Copy() *ModuleMap {
+	c := &ModuleMap{
+		m: make(map[string]Importable),
+	}
+	for name, mod := range m.m {
+		c.m[name] = mod
+	}
+	return c
+}
+
+// Len returns the number of named modules.
+func (m *ModuleMap) Len() int {
+	return len(m.m)
+}
+
+// AddMap adds named modules from another module map.
+func (m *ModuleMap) AddMap(o *ModuleMap) {
+	for name, mod := range o.m {
+		m.m[name] = mod
+	}
+}
diff --git a/vendor/github.com/d5/tengo/objects/object_ptr.go b/vendor/github.com/d5/tengo/objects/object_ptr.go
new file mode 100644
index 00000000..2c87c561
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/object_ptr.go
@@ -0,0 +1,41 @@
+package objects
+
+import (
+	"github.com/d5/tengo/compiler/token"
+)
+
+// ObjectPtr represents a free variable.
+type ObjectPtr struct {
+	Value *Object
+}
+
+func (o *ObjectPtr) String() string {
+	return "free-var"
+}
+
+// TypeName returns the name of the type.
+func (o *ObjectPtr) TypeName() string {
+	return "<free-var>"
+}
+
+// BinaryOp returns another object that is the result of
+// a given binary operator and a right-hand side object.
+func (o *ObjectPtr) BinaryOp(op token.Token, rhs Object) (Object, error) {
+	return nil, ErrInvalidOperator
+}
+
+// Copy returns a copy of the type.
+func (o *ObjectPtr) Copy() Object {
+	return o
+}
+
+// IsFalsy returns true if the value of the type is falsy.
+func (o *ObjectPtr) IsFalsy() bool {
+	return o.Value == nil
+}
+
+// Equals returns true if the value of the type
+// is equal to the value of another object.
+func (o *ObjectPtr) Equals(x Object) bool {
+	return o == x
+}
diff --git a/vendor/github.com/d5/tengo/objects/return_value.go b/vendor/github.com/d5/tengo/objects/return_value.go
deleted file mode 100644
index f7ef1dc4..00000000
--- a/vendor/github.com/d5/tengo/objects/return_value.go
+++ /dev/null
@@ -1,39 +0,0 @@
-package objects
-
-import "github.com/d5/tengo/compiler/token"
-
-// ReturnValue represents a value that is being returned.
-type ReturnValue struct {
-	Value Object
-}
-
-// TypeName returns the name of the type.
-func (o *ReturnValue) TypeName() string {
-	return "return-value"
-}
-
-func (o *ReturnValue) String() string {
-	return "<return-value>"
-}
-
-// BinaryOp returns another object that is the result of
-// a given binary operator and a right-hand side object.
-func (o *ReturnValue) BinaryOp(op token.Token, rhs Object) (Object, error) {
-	return nil, ErrInvalidOperator
-}
-
-// Copy returns a copy of the type.
-func (o *ReturnValue) Copy() Object {
-	return &ReturnValue{Value: o.Copy()}
-}
-
-// IsFalsy returns true if the value of the type is falsy.
-func (o *ReturnValue) IsFalsy() bool {
-	return false
-}
-
-// Equals returns true if the value of the type
-// is equal to the value of another object.
-func (o *ReturnValue) Equals(x Object) bool {
-	return false
-}
diff --git a/vendor/github.com/d5/tengo/objects/source_module.go b/vendor/github.com/d5/tengo/objects/source_module.go
new file mode 100644
index 00000000..577fddf2
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/source_module.go
@@ -0,0 +1,11 @@
+package objects
+
+// SourceModule is an importable module that's written in Tengo.
+type SourceModule struct {
+	Src []byte
+}
+
+// Import returns a module source code.
+func (m *SourceModule) Import(_ string) (interface{}, error) {
+	return m.Src, nil
+}
diff --git a/vendor/github.com/d5/tengo/objects/user_function.go b/vendor/github.com/d5/tengo/objects/user_function.go
index 1d9bb4f7..a896788b 100644
--- a/vendor/github.com/d5/tengo/objects/user_function.go
+++ b/vendor/github.com/d5/tengo/objects/user_function.go
@@ -6,8 +6,9 @@ import (
 
 // UserFunction represents a user function.
 type UserFunction struct {
-	Name  string
-	Value CallableFunc
+	Name       string
+	Value      CallableFunc
+	EncodingID string
 }
 
 // TypeName returns the name of the type.