oec/goparsify
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Only skip past hyphens that are truly part of ranges

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This commit is contained in:
Ted Kornish 2018-03-01 11:40:29 -08:00
parent c43616cf3a
commit 268bdd51a1
1 changed files with 11 additions and 4 deletions
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15
parser.go
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@ -169,7 +169,11 @@ func parseRepetition(defaultMin, defaultMax int, repetition ...int) (min int, ma
func parseMatcher(matcher string) (alphabet string, ranges [][]rune) {
runes := []rune(matcher)
for i := 0; i < len(runes); i++ {
i := 0
for {
if i >= len(runes) {
break
}
if i+2 < len(runes) && runes[i+1] == '-' && runes[i] != '\\' {
start := runes[i]
@ -179,14 +183,17 @@ func parseMatcher(matcher string) (alphabet string, ranges [][]rune) {
} else {
ranges = append(ranges, []rune{end, start})
}
} else if i+1 < len(runes) && runes[i] == '\\' {
alphabet += string(runes[i+1])
} else if runes[i] == '-' {
i += 3 // we just consumed 3 bytes: range start, hyphen, and range end
continue
}
if i+1 < len(runes) && runes[i] == '\\' {
alphabet += string(runes[i+1])
} else {
alphabet += string(runes[i])
}
i++
}
return alphabet, ranges