import "golang.org/x/text/runes"
Package runes provide transforms for UTF-8 encoded text.
type Set interface {
// Contains returns true if r is contained in the set.
Contains(r rune) bool
}A Set is a collection of runes.
func In(rt *unicode.RangeTable) Set
In creates a Set with a Contains method that returns true for all runes in the given RangeTable.
Code:
// Convert Latin characters to their canonical form, while keeping other
// width distinctions.
t := runes.If(runes.In(unicode.Latin), width.Fold, nil)
s, _, _ := transform.String(t, "ｱﾙｱﾉﾘｳ tech / アルアノリウ ｔｅｃｈ")
fmt.Println(s)
Output:
ｱﾙｱﾉﾘｳ tech / アルアノリウ tech
func NotIn(rt *unicode.RangeTable) Set
In creates a Set with a Contains method that returns true for all runes not in the given RangeTable.
Predicate creates a Set with a Contains method that returns f(r).
type Transformer struct {
transform.Transformer
}Transformer implements the transform.Transformer interface.
func If(s Set, tIn, tNotIn transform.Transformer) Transformer
If returns a transformer that applies tIn to consecutive runes for which s.Contains(r) and tNotIn to consecutive runes for which !s.Contains(r). Reset is called on tIn and tNotIn at the start of each run. A Nop transformer will substitute a nil value passed to tIn or tNotIn. Invalid UTF-8 is translated to RuneError to determine which transformer to apply, but is passed as is to the respective transformer.
Code:
// Widen everything but ASCII.
isASCII := func(r rune) bool { return r <= unicode.MaxASCII }
t := runes.If(runes.Predicate(isASCII), nil, width.Widen)
s, _, _ := transform.String(t, "ｱﾙｱﾉﾘｳ tech / 中國 / 5₩")
fmt.Println(s)
Output:
アルアノリウ tech / 中國 / 5￦
func Map(mapping func(rune) rune) Transformer
Map returns a Transformer that maps the runes in the input using the given mapping. Illegal bytes in the input are converted to utf8.RuneError before being passed to the mapping func.
Code:
replaceHyphens := runes.Map(func(r rune) rune {
if unicode.Is(unicode.Hyphen, r) {
return '|'
}
return r
})
s, _, _ := transform.String(replaceHyphens, "a-b‐c⸗d﹣e")
fmt.Println(s)
Output:
a|b|c|d|e
func Remove(s Set) Transformer
Remove returns a Transformer that removes runes r for which s.Contains(r). Illegal input bytes are replaced by RuneError before being passed to f.
Code:
t := transform.Chain(norm.NFD, runes.Remove(runes.In(unicode.Mn)), norm.NFC) s, _, _ := transform.String(t, "résumé") fmt.Println(s)
Output:
resume
func ReplaceIllFormed() Transformer
ReplaceIllFormed returns a transformer that replaces all input bytes that are not part of a well-formed UTF-8 code sequence with utf8.RuneError.
func (t Transformer) Bytes(b []byte) []byte
Bytes returns a new byte slice with the result of converting b using t. It calls Reset on t. It returns nil if any error was found. This can only happen if an error-producing Transformer is passed to If.
func (t Transformer) String(s string) string
String returns a string with the result of converting s using t. It calls Reset on t. It returns the empty string if any error was found. This can only happen if an error-producing Transformer is passed to If.
Package runes imports 3 packages (graph) and is imported by 2 packages. Updated 6 days ago. Refresh now. Tools for package owners.