Fixed kleene star matching at end of string - failed test a* and ppppppppaaaaaaaa
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17
matching.go
17
matching.go
@@ -34,6 +34,7 @@ func matchHelper(start *State, str string, indices []matchIndex, offset int) []m
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return indices
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}
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foundPath := false
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startIdx := 0
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endIdx := 0
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currentStates := make([]*State, 0)
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@@ -47,12 +48,13 @@ func matchHelper(start *State, str string, indices []matchIndex, offset int) []m
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startIdx = i
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i++ // Advance to next character (if we aren't at a 0-state, which doesn't match anything), so that we can check for transitions. If we advance at a 0-state, we will never get a chance to match the first character
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}
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// TODO - If start state is kleene star, try to match the next state
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startingFrom := i
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currentStates = append(currentStates, start)
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// Main loop
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for i < len(str) {
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foundPath = false
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zeroStates := make([]*State, 0)
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// Keep taking zero-states, until there are no more left to take
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zeroStates, isZero := takeZeroState(currentStates)
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@@ -69,16 +71,23 @@ func matchHelper(start *State, str string, indices []matchIndex, offset int) []m
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for _, state := range currentStates {
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if len(state.transitions[int(str[i])]) > 0 {
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tempStates = append(tempStates, state.transitions[int(str[i])]...)
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foundPath = true
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} else {
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// This enables the 'greedy' behavior - last-state status is only checked if we can't match anything else
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if state.isLast {
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endIdx = i
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indices = append(indices, matchIndex{startIdx + offset, endIdx + offset})
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}
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// Recursion - match with rest of string
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return matchHelper(start, str[i:], indices, offset+i)
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}
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}
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if foundPath == false {
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// Recursion - match with rest of string if we have nowhere to go. If we haven't moved in the string, increment the counter by 1 to ensure we don't keep trying the same string over and over
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if i == startingFrom {
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i++
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}
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return matchHelper(start, str[i:], indices, offset+i)
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}
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currentStates = make([]*State, len(tempStates))
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copy(currentStates, tempStates)
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tempStates = nil
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