mirror of
https://github.com/MontFerret/ferret.git
synced 2024-12-16 11:37:36 +02:00
123 lines
2.0 KiB
Go
123 lines
2.0 KiB
Go
package values
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import (
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"encoding/json"
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"fmt"
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"hash/fnv"
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"strings"
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"github.com/MontFerret/ferret/pkg/runtime/core"
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"github.com/MontFerret/ferret/pkg/runtime/values/types"
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)
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type String string
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const (
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EmptyString = String("")
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SpaceString = String(" ")
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)
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func NewString(input string) String {
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if input == "" {
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return EmptyString
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}
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return String(input)
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}
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func NewStringFromRunes(input []rune) String {
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if len(input) == 0 {
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return EmptyString
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}
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return String(input)
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}
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func ParseString(input interface{}) (String, error) {
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if core.IsNil(input) {
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return EmptyString, nil
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}
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str, ok := input.(string)
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if ok {
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if str != "" {
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return String(str), nil
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}
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return EmptyString, nil
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}
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stringer, ok := input.(fmt.Stringer)
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if ok {
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return String(stringer.String()), nil
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}
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return EmptyString, core.Error(core.ErrInvalidType, "expected 'string'")
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}
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func MustParseString(input interface{}) String {
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res, err := ParseString(input)
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if err != nil {
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panic(err)
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}
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return res
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}
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func (t String) MarshalJSON() ([]byte, error) {
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return json.Marshal(string(t))
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}
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func (t String) Type() core.Type {
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return types.String
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}
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func (t String) String() string {
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return string(t)
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}
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func (t String) Compare(other core.Value) int64 {
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if other.Type() == types.String {
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return int64(strings.Compare(string(t), other.Unwrap().(string)))
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}
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return types.Compare(types.String, other.Type())
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}
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func (t String) Unwrap() interface{} {
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return string(t)
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}
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func (t String) Hash() uint64 {
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h := fnv.New64a()
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h.Write([]byte(t.Type().String()))
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h.Write([]byte(":"))
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h.Write([]byte(t))
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return h.Sum64()
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}
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func (t String) Copy() core.Value {
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return t
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}
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func (t String) Length() Int {
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return Int(len(t))
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}
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func (t String) Contains(other String) Boolean {
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return t.IndexOf(other) > -1
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}
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func (t String) IndexOf(other String) Int {
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return Int(strings.Index(string(t), string(other)))
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}
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func (t String) Concat(other core.Value) String {
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return String(string(t) + other.String())
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}
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