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Changed behavior of SOS and EOS assertions depending on whether multiline mode is enabled or not

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Aadhavan Srinivasan
2025-01-28 15:51:48 -05:00
parent 74b37ff818
commit d029a171c0
1 changed files with 6 additions and 2 deletions
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8
nfa.go
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@@ -108,11 +108,15 @@ func (s State) checkAssertion(str []rune, idx int) bool {
return true return true
} }
if s.assert == SOS { if s.assert == SOS {
return idx == 0 // Single-line mode: Beginning of string
// Multi-line mode: Previous character was newline
return idx == 0 || (multilineMode && (idx > 0 && str[idx-1] == '\n'))
} }
if s.assert == EOS { if s.assert == EOS {
// Single-line mode: End of string
// Multi-line mode: current character is newline
// Index is at the end of the string, or it points to the last character which is a newline // Index is at the end of the string, or it points to the last character which is a newline
return idx == len(str) || (idx == len(str)-1 && str[len(str)-1] == '\n') return idx == len(str) || (multilineMode && str[idx] == '\n')
} }
if s.assert == WBOUND { if s.assert == WBOUND {
return isWordBoundary(str, idx) return isWordBoundary(str, idx)