111 lines
2.3 KiB
Go
111 lines
2.3 KiB
Go
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
|
|
}
|