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str.go
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str.go
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// Package str exposes functionality from Go's strings package as an Elvish
// module.
package str
import (
"bytes"
"fmt"
"strconv"
"strings"
"unicode"
"unicode/utf8"
"src.elv.sh/pkg/eval"
"src.elv.sh/pkg/eval/errs"
"src.elv.sh/pkg/eval/vals"
)
var Ns = eval.BuildNsNamed("str").
AddGoFns(map[string]any{
"compare": strings.Compare,
"contains": strings.Contains,
"contains-any": strings.ContainsAny,
"count": strings.Count,
"equal-fold": strings.EqualFold,
// TODO: FieldsFunc
"fields": strings.Fields,
"from-codepoints": fromCodepoints,
"from-utf8-bytes": fromUtf8Bytes,
"has-prefix": strings.HasPrefix,
"has-suffix": strings.HasSuffix,
"index": strings.Index,
"index-any": strings.IndexAny,
// TODO: IndexFunc
"join": join,
"last-index": strings.LastIndex,
// TODO: LastIndexFunc, Map, Repeat
"replace": replace,
"split": split,
// TODO: SplitAfter
//lint:ignore SA1019 Elvish builtins need to be formally deprecated
// before removal
"title": strings.Title,
"to-codepoints": toCodepoints,
"to-lower": strings.ToLower,
"to-title": strings.ToTitle,
"to-upper": strings.ToUpper,
"to-utf8-bytes": toUtf8Bytes,
// TODO: ToLowerSpecial, ToTitleSpecial, ToUpperSpecial
"trim": strings.Trim,
"trim-left": strings.TrimLeft,
"trim-right": strings.TrimRight,
// TODO: TrimLeft,Right}Func
"trim-space": strings.TrimSpace,
"trim-prefix": strings.TrimPrefix,
"trim-suffix": strings.TrimSuffix,
}).Ns()
func fromCodepoints(nums ...int) (string, error) {
var b bytes.Buffer
for _, num := range nums {
if num < 0 || num > unicode.MaxRune {
return "", errs.OutOfRange{
What: "codepoint",
ValidLow: "0", ValidHigh: strconv.Itoa(unicode.MaxRune),
Actual: hex(num),
}
}
if !utf8.ValidRune(rune(num)) {
return "", errs.BadValue{
What: "argument to str:from-codepoints",
Valid: "valid Unicode codepoint",
Actual: hex(num),
}
}
b.WriteRune(rune(num))
}
return b.String(), nil
}
func hex(i int) string {
if i < 0 {
return "-0x" + strconv.FormatInt(-int64(i), 16)
}
return "0x" + strconv.FormatInt(int64(i), 16)
}
func fromUtf8Bytes(nums ...int) (string, error) {
var b bytes.Buffer
for _, num := range nums {
if num < 0 || num > 255 {
return "", errs.OutOfRange{
What: "byte",
ValidLow: "0", ValidHigh: "255",
Actual: strconv.Itoa(num)}
}
b.WriteByte(byte(num))
}
if !utf8.Valid(b.Bytes()) {
return "", errs.BadValue{
What: "arguments to str:from-utf8-bytes",
Valid: "valid UTF-8 sequence",
Actual: fmt.Sprint(b.Bytes())}
}
return b.String(), nil
}
func join(sep string, inputs eval.Inputs) (string, error) {
var buf bytes.Buffer
var errJoin error
first := true
inputs(func(v any) {
if errJoin != nil {
return
}
if s, ok := v.(string); ok {
if first {
first = false
} else {
buf.WriteString(sep)
}
buf.WriteString(s)
} else {
errJoin = errs.BadValue{
What: "input to str:join", Valid: "string", Actual: vals.Kind(v)}
}
})
return buf.String(), errJoin
}
type maxOpt struct{ Max int }
func (o *maxOpt) SetDefaultOptions() { o.Max = -1 }
func replace(opts maxOpt, old, repl, s string) string {
return strings.Replace(s, old, repl, opts.Max)
}
func split(fm *eval.Frame, opts maxOpt, sep, s string) error {
out := fm.ValueOutput()
parts := strings.SplitN(s, sep, opts.Max)
for _, p := range parts {
err := out.Put(p)
if err != nil {
return err
}
}
return nil
}
func toCodepoints(fm *eval.Frame, s string) error {
out := fm.ValueOutput()
for _, r := range s {
err := out.Put("0x" + strconv.FormatInt(int64(r), 16))
if err != nil {
return err
}
}
return nil
}
func toUtf8Bytes(fm *eval.Frame, s string) error {
out := fm.ValueOutput()
for _, r := range []byte(s) {
err := out.Put("0x" + strconv.FormatInt(int64(r), 16))
if err != nil {
return err
}
}
return nil
}