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Optimizations, regex character ranges

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This commit is contained in:
Nathan Braswell
2016-05-05 04:51:10 -04:00
parent 02c77899b8
commit 9d7a65294f
8 changed files with 100 additions and 76 deletions
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28
stdlib/grammer.krak
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@@ -179,22 +179,22 @@ obj grammer (Object, Serializable) {
}
fun first_vector(rhs: ref vector::vector<symbol::symbol>): set::set<symbol::symbol> {
var toRet = set::set<symbol::symbol>()
if (rhs.size) {
for (var i = 0; i < rhs.size; i++;) {
var lookahead = first_set_map[rhs[i]]
if (lookahead.contains(symbol::null_symbol())) {
// remove the null if this is not the last in the rule
if (i != rhs.size-1)
lookahead.remove(symbol::null_symbol())
toRet.add(lookahead)
} else {
toRet.add(lookahead)
break
}
if (rhs.size) {
for (var i = 0; i < rhs.size; i++;) {
var lookahead = first_set_map[rhs[i]]
if (lookahead.contains(symbol::null_symbol())) {
// remove the null if this is not the last in the rule
if (i != rhs.size-1)
lookahead.remove(symbol::null_symbol())
toRet.add(lookahead)
} else {
toRet.add(lookahead)
break
}
} else {
toRet.add(symbol::null_symbol())
}
} else {
toRet.add(symbol::null_symbol())
}
return toRet
}