traxys/tree-sitter
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Compute item set transitions

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This commit is contained in:
Max Brunsfeld 2013-11-20 19:00:20 -08:00
parent 100ab56779
commit 99c216f78a
23 changed files with 250 additions and 55 deletions
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13
src/lr/item.cpp
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@ -10,13 +10,13 @@ namespace tree_sitter {
rule(rule),
consumed_sym_count(consumed_sym_count) {};
Item Item::at_beginning_of_rule(const std::string &rule_name, Grammar &grammar) {
Item Item::at_beginning_of_rule(const std::string &rule_name, const Grammar &grammar) {
return Item(rule_name, grammar.rule(rule_name), 0);
}
TransitionMap<Item> Item::transitions() const {
return rule->transitions().map<Item>([&](rules::rule_ptr to_rule) {
return item_ptr(new Item(rule_name, to_rule, consumed_sym_count + 1));
return std::make_shared<Item>(rule_name, to_rule, consumed_sym_count + 1);
});
};
@ -24,16 +24,15 @@ namespace tree_sitter {
vector<rules::sym_ptr> result;
for (auto pair : rule->transitions()) {
shared_ptr<const rules::Symbol> sym = dynamic_pointer_cast<const rules::Symbol>(pair.first);
if (sym != nullptr) result.push_back(sym);
if (sym) result.push_back(sym);
}
return result;
}
bool Item::operator==(const Item &other) const {
return (
other.rule_name == rule_name &&
other.rule == rule &&
other.consumed_sym_count == consumed_sym_count);
bool rule_names_eq = other.rule_name == rule_name;
bool rules_eq = (*other.rule == *rule);
return rule_names_eq && rules_eq;
}
std::ostream& operator<<(ostream &stream, const Item &item) {