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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
}
formatArgs := make([]interface{}, numArgs-1, numArgs-1)
for idx, arg := range args[1:] {
formatArgs[idx] = objects.ToInterface(arg)
}
fmt.Printf(format.Value, formatArgs...)
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
}
formatArgs := make([]interface{}, numArgs-1, numArgs-1)
for idx, arg := range args[1:] {
formatArgs[idx] = objects.ToInterface(arg)
}
s := fmt.Sprintf(format.Value, formatArgs...)
if len(s) > tengo.MaxStringLen {
return nil, objects.ErrStringLimit
}
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
}
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