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Compute closure of item sets under symbol expansion

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This commit is contained in:
Max Brunsfeld 2013-11-12 18:37:02 -08:00
parent 6bbaba3ef8
commit f7063ba1d8
23 changed files with 251 additions and 91 deletions
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15
src/lr/item.cpp
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@ -1,4 +1,5 @@
#include "item.h"
#include "grammar.h"
using namespace std;
@ -9,16 +10,22 @@ namespace tree_sitter {
rule(rule),
consumed_sym_count(consumed_sym_count) {};
Item Item::at_beginning_of_rule(const std::string &rule_name, Grammar &grammar) {
return Item(rule_name, grammar.rules[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));
});
};
vector<rules::rule_ptr> Item::next_symbols() const {
vector<rules::rule_ptr> result;
for (auto pair : rule->transitions())
result.push_back(pair.second);
vector<rules::sym_ptr> Item::next_symbols() const {
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);
}
return result;
}