Rockingcool/kleingrep
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Added more test cases

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This commit is contained in:
Aadhavan Srinivasan
2024-10-24 17:33:38 -04:00
parent 935759ed9f
commit 273a03e3cf
2 changed files with 18 additions and 4 deletions
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11
main.go
View File

@@ -38,7 +38,7 @@ func shuntingYard(re string) string {
re_postfix = append(re_postfix, re_runes[i])
if re_runes[i] != '(' && re_runes[i] != '|' {
if i < len(re_runes)-1 {
if re_runes[i+1] != '|' && re_runes[i+1] != '*' && re_runes[i+1] != ')' {
if re_runes[i+1] != '|' && re_runes[i+1] != '*' && re_runes[i+1] != '+' && re_runes[i+1] != ')' {
re_postfix = append(re_postfix, CONCAT)
}
}
@@ -139,7 +139,14 @@ func thompson(re string) *State {
stateToAdd.transitions[s1.content] = append(stateToAdd.transitions[s1.content], s1)
nfa = append(nfa, stateToAdd)
case '+':
s1 := pop(&nfa)
for i := range s1.output {
s1.output[i].transitions[s1.content] = append(s1.output[i].transitions[s1.content], s1)
}
// Reset output to s1 (in case s1 was a union operator state, which has multiple outputs)
s1.output = nil
s1.output = append(s1.output, s1)
nfa = append(nfa, s1)
case '|':
s1 := pop(&nfa)
s2 := pop(&nfa)

11
re_test.go
View File

@@ -14,12 +14,19 @@ var reTests = []struct {
{"a", "bca", []matchIndex{{2, 3}}},
{"l", "ggllgg", []matchIndex{{2, 3}, {3, 4}}},
{"(b|c)", "abdceb", []matchIndex{{1, 2}, {3, 4}, {5, 6}}},
{"a*", "brerereraaaaabbbbb", []matchIndex{{8, 13}}},
{"a+", "brerereraaaaabbbbb", []matchIndex{{8, 13}}},
{"ab+", "qweqweqweaqweqweabbbbbr", []matchIndex{{16, 22}}},
{"(b|c|A)", "ooaoobocA", []matchIndex{{5, 6}, {7, 8}, {8, 9}}},
{"ab*", "a", []matchIndex{{0, 1}}},
{"ab*", "abb", []matchIndex{{0, 3}}},
{"(abc)*", "abcabcabc", []matchIndex{{0, 9}}},
{"((abc)|(def))*", "abcdef", []matchIndex{{0, 6}}},
{"(abc)*|(def)*", "abcdef", []matchIndex{{0, 3}, {3, 6}}},
}
func TestFindAllMatches(t *testing.T) {
for _, test := range reTests {
t.Run(test.re+" "+test.str, func(t *testing.T) {
t.Run(test.re+" "+test.str, func(t *testing.T) {
re_postfix := shuntingYard(test.re)
startState := thompson(re_postfix)
matchIndices := findAllMatches(startState, test.str)