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Copy pathstring.go
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275 lines (260 loc) · 7.99 KB
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package builtins
import (
"fmt"
"strings"
tengo "github.com/d5/tengo/v2"
)
func splitFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "split",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 2 {
return tengo.UndefinedValue, fmt.Errorf("split: expected 2 arguments (str, sep)")
}
s, ok1 := args[0].(*tengo.String)
sep, ok2 := args[1].(*tengo.String)
if !ok1 || !ok2 {
return tengo.UndefinedValue, fmt.Errorf("split: both arguments must be strings")
}
parts := strings.Split(s.Value, sep.Value)
arr := &tengo.Array{Value: make([]tengo.Object, len(parts))}
for i, p := range parts {
arr.Value[i] = &tengo.String{Value: p}
}
return arr, nil
},
}
}
func joinFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "join",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 2 {
return tengo.UndefinedValue, fmt.Errorf("join: expected 2 arguments (arr, sep)")
}
arr, ok := args[0].(*tengo.Array)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("join: first argument must be an array")
}
sep, ok := args[1].(*tengo.String)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("join: second argument must be a string")
}
parts := make([]string, len(arr.Value))
for i, v := range arr.Value {
if s, ok := v.(*tengo.String); ok {
parts[i] = s.Value
} else {
parts[i] = v.String()
}
}
return &tengo.String{Value: strings.Join(parts, sep.Value)}, nil
},
}
}
func trimFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "trim",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 1 {
return tengo.UndefinedValue, fmt.Errorf("trim: expected 1 argument")
}
s, ok := args[0].(*tengo.String)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("trim: argument must be a string")
}
return &tengo.String{Value: strings.TrimSpace(s.Value)}, nil
},
}
}
func toUpperFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "to_upper",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 1 {
return tengo.UndefinedValue, fmt.Errorf("to_upper: expected 1 argument")
}
s, ok := args[0].(*tengo.String)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("to_upper: argument must be a string")
}
return &tengo.String{Value: strings.ToUpper(s.Value)}, nil
},
}
}
func toLowerFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "to_lower",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 1 {
return tengo.UndefinedValue, fmt.Errorf("to_lower: expected 1 argument")
}
s, ok := args[0].(*tengo.String)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("to_lower: argument must be a string")
}
return &tengo.String{Value: strings.ToLower(s.Value)}, nil
},
}
}
func containsFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "contains",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 2 {
return tengo.UndefinedValue, fmt.Errorf("contains: expected 2 arguments (str, sub)")
}
s, ok1 := args[0].(*tengo.String)
sub, ok2 := args[1].(*tengo.String)
if !ok1 || !ok2 {
return tengo.UndefinedValue, fmt.Errorf("contains: both arguments must be strings")
}
if strings.Contains(s.Value, sub.Value) {
return tengo.TrueValue, nil
}
return tengo.FalseValue, nil
},
}
}
func startsWithFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "starts_with",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 2 {
return tengo.UndefinedValue, fmt.Errorf("starts_with: expected 2 arguments (str, prefix)")
}
s, ok1 := args[0].(*tengo.String)
p, ok2 := args[1].(*tengo.String)
if !ok1 || !ok2 {
return tengo.UndefinedValue, fmt.Errorf("starts_with: both arguments must be strings")
}
if strings.HasPrefix(s.Value, p.Value) {
return tengo.TrueValue, nil
}
return tengo.FalseValue, nil
},
}
}
func endsWithFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "ends_with",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 2 {
return tengo.UndefinedValue, fmt.Errorf("ends_with: expected 2 arguments (str, suffix)")
}
s, ok1 := args[0].(*tengo.String)
sfx, ok2 := args[1].(*tengo.String)
if !ok1 || !ok2 {
return tengo.UndefinedValue, fmt.Errorf("ends_with: both arguments must be strings")
}
if strings.HasSuffix(s.Value, sfx.Value) {
return tengo.TrueValue, nil
}
return tengo.FalseValue, nil
},
}
}
func replaceFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "replace",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 3 {
return tengo.UndefinedValue, fmt.Errorf("replace: expected 3 arguments (str, old, new)")
}
s, ok1 := args[0].(*tengo.String)
old, ok2 := args[1].(*tengo.String)
newStr, ok3 := args[2].(*tengo.String)
if !ok1 || !ok2 || !ok3 {
return tengo.UndefinedValue, fmt.Errorf("replace: all arguments must be strings")
}
return &tengo.String{Value: strings.Replace(s.Value, old.Value, newStr.Value, 1)}, nil
},
}
}
func replaceAllFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "replace_all",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 3 {
return tengo.UndefinedValue, fmt.Errorf("replace_all: expected 3 arguments (str, old, new)")
}
s, ok1 := args[0].(*tengo.String)
old, ok2 := args[1].(*tengo.String)
newStr, ok3 := args[2].(*tengo.String)
if !ok1 || !ok2 || !ok3 {
return tengo.UndefinedValue, fmt.Errorf("replace_all: all arguments must be strings")
}
return &tengo.String{Value: strings.ReplaceAll(s.Value, old.Value, newStr.Value)}, nil
},
}
}
func repeatFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "repeat",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 2 {
return tengo.UndefinedValue, fmt.Errorf("repeat: expected 2 arguments (str, n)")
}
s, ok := args[0].(*tengo.String)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("repeat: first argument must be a string")
}
n, ok := args[1].(*tengo.Int)
if !ok {
return tengo.UndefinedValue, fmt.Errorf("repeat: second argument must be an integer")
}
if n.Value < 0 {
return tengo.UndefinedValue, fmt.Errorf("repeat: n must be non-negative")
}
return &tengo.String{Value: strings.Repeat(s.Value, int(n.Value))}, nil
},
}
}
func padLeftFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "pad_left",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 3 {
return tengo.UndefinedValue, fmt.Errorf("pad_left: expected 3 arguments (str, width, pad)")
}
s, ok1 := args[0].(*tengo.String)
w, ok2 := args[1].(*tengo.Int)
p, ok3 := args[2].(*tengo.String)
if !ok1 || !ok2 || !ok3 {
return tengo.UndefinedValue, fmt.Errorf("pad_left: wrong argument types")
}
if len(p.Value) == 0 {
return tengo.UndefinedValue, fmt.Errorf("pad_left: pad must not be empty")
}
result := s.Value
for len([]rune(result)) < int(w.Value) {
result = p.Value + result
}
return &tengo.String{Value: result}, nil
},
}
}
func padRightFunc() *tengo.UserFunction {
return &tengo.UserFunction{
Name: "pad_right",
Value: func(args ...tengo.Object) (tengo.Object, error) {
if len(args) != 3 {
return tengo.UndefinedValue, fmt.Errorf("pad_right: expected 3 arguments (str, width, pad)")
}
s, ok1 := args[0].(*tengo.String)
w, ok2 := args[1].(*tengo.Int)
p, ok3 := args[2].(*tengo.String)
if !ok1 || !ok2 || !ok3 {
return tengo.UndefinedValue, fmt.Errorf("pad_right: wrong argument types")
}
if len(p.Value) == 0 {
return tengo.UndefinedValue, fmt.Errorf("pad_right: pad must not be empty")
}
result := s.Value
for len([]rune(result)) < int(w.Value) {
result = result + p.Value
}
return &tengo.String{Value: result}, nil
},
}
}