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Compute parse state group signature based on the item set

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This commit is contained in:
Max Brunsfeld 2016-11-16 10:21:30 -08:00
parent 42d37656ea
commit 6cfd009503
5 changed files with 29 additions and 76 deletions
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21
src/compiler/build_tables/parse_item.cc
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@ -2,6 +2,7 @@
#include <string>
#include "compiler/syntax_grammar.h"
#include "compiler/rules/built_in_symbols.h"
#include "compiler/util/hash_combine.h"
namespace tree_sitter {
namespace build_tables {
@ -12,6 +13,9 @@ using std::string;
using std::to_string;
using std::hash;
using rules::Symbol;
using util::hash_combine;
ParseItem::ParseItem() : variable_index(-1), production(nullptr), step_index(0) {}
ParseItem::ParseItem(const Symbol &lhs, const Production &production,
unsigned int step_index)
@ -108,6 +112,23 @@ size_t ParseItemSet::Hash::operator()(const ParseItemSet &item_set) const {
return result;
}
size_t ParseItemSet::unfinished_item_signature() const {
size_t result = 0;
ParseItem previous_item;
for (auto &pair : entries) {
const ParseItem &item = pair.first;
if (item.step_index < item.production->size()) {
if (item.variable_index != previous_item.variable_index &&
item.step_index != previous_item.step_index) {
hash_combine(&result, item.variable_index);
hash_combine(&result, item.step_index);
previous_item = item;
}
}
}
return result;
}
ParseItemSet::TransitionMap ParseItemSet::transitions() const {
ParseItemSet::TransitionMap result;
for (const auto &pair : entries) {