57 lines
1005 B
Go
57 lines
1005 B
Go
package textedit
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func replaceEdit(match, replacement []rune) func(rune, []rune) ([]rune, []rune) {
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return func(r rune, state []rune) ([]rune, []rune) {
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state = append(state, r)
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if len(state) > len(match) {
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return state, nil
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}
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if r != match[len(state)-1] {
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return state, nil
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}
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if len(state) == len(match) {
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return replacement, nil
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}
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return nil, state
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}
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}
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func replaceRelease(state []rune) []rune {
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return state
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}
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func replaceOne(match, replacement string) Editor {
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return Func(
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replaceEdit([]rune(match), []rune(replacement)),
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replaceRelease,
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)
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}
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func replace(a ...string) Editor {
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if len(a)%2 != 0 {
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a = append(a, "")
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}
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var e []Editor
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for i := 0; i < len(a); i += 2 {
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e = append(
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e,
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replaceOne(a[i], a[i+1]),
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)
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}
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return sequence(e...)
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}
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func escape(esc rune, chars ...rune) Editor {
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r := []string{string(esc), string([]rune{esc, esc})}
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for _, c := range chars {
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r = append(r, string(c), string([]rune{esc, c}))
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}
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return replace(r...)
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}
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