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102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
package stdlib
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import (
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"fmt"
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"github.com/d5/tengo/v2"
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)
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var fmtModule = map[string]tengo.Object{
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"print": &tengo.UserFunction{Name: "print", Value: fmtPrint},
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"printf": &tengo.UserFunction{Name: "printf", Value: fmtPrintf},
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"println": &tengo.UserFunction{Name: "println", Value: fmtPrintln},
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"sprintf": &tengo.UserFunction{Name: "sprintf", Value: fmtSprintf},
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}
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func fmtPrint(args ...tengo.Object) (ret tengo.Object, err error) {
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printArgs, err := getPrintArgs(args...)
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if err != nil {
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return nil, err
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}
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_, _ = fmt.Print(printArgs...)
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return nil, nil
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}
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func fmtPrintf(args ...tengo.Object) (ret tengo.Object, err error) {
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numArgs := len(args)
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if numArgs == 0 {
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return nil, tengo.ErrWrongNumArguments
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}
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format, ok := args[0].(*tengo.String)
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if !ok {
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return nil, tengo.ErrInvalidArgumentType{
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Name: "format",
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Expected: "string",
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Found: args[0].TypeName(),
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}
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}
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if numArgs == 1 {
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fmt.Print(format)
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return nil, nil
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}
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s, err := tengo.Format(format.Value, args[1:]...)
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if err != nil {
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return nil, err
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}
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fmt.Print(s)
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return nil, nil
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}
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func fmtPrintln(args ...tengo.Object) (ret tengo.Object, err error) {
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printArgs, err := getPrintArgs(args...)
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if err != nil {
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return nil, err
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}
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printArgs = append(printArgs, "\n")
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_, _ = fmt.Print(printArgs...)
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return nil, nil
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}
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func fmtSprintf(args ...tengo.Object) (ret tengo.Object, err error) {
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numArgs := len(args)
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if numArgs == 0 {
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return nil, tengo.ErrWrongNumArguments
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}
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format, ok := args[0].(*tengo.String)
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if !ok {
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return nil, tengo.ErrInvalidArgumentType{
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Name: "format",
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Expected: "string",
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Found: args[0].TypeName(),
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}
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}
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if numArgs == 1 {
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// okay to return 'format' directly as String is immutable
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return format, nil
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}
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s, err := tengo.Format(format.Value, args[1:]...)
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if err != nil {
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return nil, err
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}
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return &tengo.String{Value: s}, nil
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}
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func getPrintArgs(args ...tengo.Object) ([]interface{}, error) {
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var printArgs []interface{}
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l := 0
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for _, arg := range args {
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s, _ := tengo.ToString(arg)
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slen := len(s)
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// make sure length does not exceed the limit
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if l+slen > tengo.MaxStringLen {
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return nil, tengo.ErrStringLimit
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}
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l += slen
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printArgs = append(printArgs, s)
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}
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return printArgs, nil
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}
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