Update to tengo v2 (#976)

vendor/github.com/d5/tengo/v2/stdlib/fmt.go

@@ -0,0 +1,101 @@
+package stdlib
+
+import (
+	"fmt"
+
+	"github.com/d5/tengo/v2"
+)
+
+var fmtModule = map[string]tengo.Object{
+	"print":   &tengo.UserFunction{Name: "print", Value: fmtPrint},
+	"printf":  &tengo.UserFunction{Name: "printf", Value: fmtPrintf},
+	"println": &tengo.UserFunction{Name: "println", Value: fmtPrintln},
+	"sprintf": &tengo.UserFunction{Name: "sprintf", Value: fmtSprintf},
+}
+
+func fmtPrint(args ...tengo.Object) (ret tengo.Object, err error) {
+	printArgs, err := getPrintArgs(args...)
+	if err != nil {
+		return nil, err
+	}
+	_, _ = fmt.Print(printArgs...)
+	return nil, nil
+}
+
+func fmtPrintf(args ...tengo.Object) (ret tengo.Object, err error) {
+	numArgs := len(args)
+	if numArgs == 0 {
+		return nil, tengo.ErrWrongNumArguments
+	}
+
+	format, ok := args[0].(*tengo.String)
+	if !ok {
+		return nil, tengo.ErrInvalidArgumentType{
+			Name:     "format",
+			Expected: "string",
+			Found:    args[0].TypeName(),
+		}
+	}
+	if numArgs == 1 {
+		fmt.Print(format)
+		return nil, nil
+	}
+
+	s, err := tengo.Format(format.Value, args[1:]...)
+	if err != nil {
+		return nil, err
+	}
+	fmt.Print(s)
+	return nil, nil
+}
+
+func fmtPrintln(args ...tengo.Object) (ret tengo.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 ...tengo.Object) (ret tengo.Object, err error) {
+	numArgs := len(args)
+	if numArgs == 0 {
+		return nil, tengo.ErrWrongNumArguments
+	}
+
+	format, ok := args[0].(*tengo.String)
+	if !ok {
+		return nil, tengo.ErrInvalidArgumentType{
+			Name:     "format",
+			Expected: "string",
+			Found:    args[0].TypeName(),
+		}
+	}
+	if numArgs == 1 {
+		// okay to return 'format' directly as String is immutable
+		return format, nil
+	}
+	s, err := tengo.Format(format.Value, args[1:]...)
+	if err != nil {
+		return nil, err
+	}
+	return &tengo.String{Value: s}, nil
+}
+
+func getPrintArgs(args ...tengo.Object) ([]interface{}, error) {
+	var printArgs []interface{}
+	l := 0
+	for _, arg := range args {
+		s, _ := tengo.ToString(arg)
+		slen := len(s)
+		// make sure length does not exceed the limit
+		if l+slen > tengo.MaxStringLen {
+			return nil, tengo.ErrStringLimit
+		}
+		l += slen
+		printArgs = append(printArgs, s)
+	}
+	return printArgs, nil
+}