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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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8
stdlib/parser.krak
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@@ -19,6 +19,7 @@ obj parser (Object) {
var to_shift: stack< pair<*tree<int>, int> >
var SPPFStepNodes: vector< pair<*tree<symbol>, int> >
var packed_map: map<*tree<symbol>, bool>
var reduces_to_null_map: map<vector<symbol>, bool>
fun construct(grammerIn: grammer): *parser {
input.construct()
@@ -28,6 +29,7 @@ obj parser (Object) {
to_shift.construct()
SPPFStepNodes.construct()
packed_map.construct()
reduces_to_null_map.construct()
return this
}
fun copy_construct(old: *parser) {
@@ -38,6 +40,7 @@ obj parser (Object) {
to_shift.copy_construct(&old->to_shift)
SPPFStepNodes.copy_construct(&old->SPPFStepNodes)
packed_map.copy_construct(&old->packed_map)
reduces_to_null_map.copy_construct(&old->reduces_to_null_map)
}
fun operator=(old: ref parser) {
destruct()
@@ -51,6 +54,7 @@ obj parser (Object) {
to_shift.destruct()
SPPFStepNodes.destruct()
packed_map.destruct()
reduces_to_null_map.destruct()
}
fun parse_input(inputStr: string, name: string): *tree<symbol> {
@@ -386,7 +390,9 @@ obj parser (Object) {
return r.position == 0 && reduces_to_null(r)
}
fun reduces_to_null(r: ref rule): bool {
return gram.first_vector(r.rhs).contains(null_symbol())
if (!reduces_to_null_map.contains_key(r.rhs))
reduces_to_null_map[r.rhs] = gram.first_vector(r.rhs).contains(null_symbol())
return reduces_to_null_map[r.rhs]
}
fun get_nullable_parts(r: ref rule): *tree<symbol> {
if (reduces_to_null(r))