55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package normalization
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import (
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"bytes"
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_ "embed"
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"regexp"
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"strconv"
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"strings"
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"unicode/utf8"
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)
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//go:embed CaseFolding_v11.txt
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var v11 string
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var foldMap map[rune][]rune
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func init() {
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foldMap = map[rune][]rune{}
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r, _ := regexp.Compile(`([[:xdigit:]]+?); (.); ([[:xdigit:] ]+?);`)
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matches := r.FindAllStringSubmatch(v11, 1000000000)
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for i := range matches {
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if matches[i][2] == "C" || matches[i][2] == "F" {
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key, _ := strconv.Unquote(`"\u` + matches[i][1] + `"`)
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splits := strings.Split(matches[i][3], " ")
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var values []rune
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for j := range splits {
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value, _ := strconv.Unquote(`"\u` + splits[j] + `"`)
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values = append(values, []rune(value)[0])
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}
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foldMap[[]rune(key)[0]] = values
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}
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}
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}
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func CaseFold(name []byte) []byte {
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var b bytes.Buffer
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b.Grow(len(name))
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for i := 0; i < len(name); {
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r, w := utf8.DecodeRune(name[i:])
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if r == utf8.RuneError && w < 2 {
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// HACK: their RuneError is actually a valid character if coming from a width of 2 or more
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return name
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}
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replacements := foldMap[r]
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if len(replacements) > 0 {
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for j := range replacements {
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b.WriteRune(replacements[j])
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}
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} else {
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b.WriteRune(r)
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}
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i += w
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}
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return b.Bytes()
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}
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