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Organize source into compiler and runtime dirs

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This commit is contained in:
Max Brunsfeld 2013-12-15 23:57:30 -08:00
parent e480cf538d
commit 9618efd12a
46 changed files with 169 additions and 38 deletions
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59
src/lr/parse_table_builder.cpp
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@ -1,59 +0,0 @@
#include "parse_table_builder.h"
#include "item_set.h"
#include "rules.h"
using namespace std;
namespace tree_sitter {
namespace lr {
static int NOT_FOUND = -1;
ParseTable ParseTableBuilder::build_table(const tree_sitter::Grammar &grammar) {
auto builder = ParseTableBuilder(grammar);
builder.build();
return builder.table;
}
ParseTableBuilder::ParseTableBuilder(const Grammar &grammar) :
grammar(grammar),
table(ParseTable(grammar.rule_names())),
state_indices(unordered_map<size_t, size_t>()) {};
void ParseTableBuilder::build() {
auto item = Item(ParseTable::START, rules::sym(grammar.start_rule_name), 0);
auto item_set = std::make_shared<ItemSet>(item, grammar);
add_item_set(item_set);
}
size_t ParseTableBuilder::add_item_set(const shared_ptr<const ItemSet> item_set) {
auto state_index = state_index_for_item_set(*item_set);
if (state_index == NOT_FOUND) {
state_index = table.add_state();
state_indices[std::hash<ItemSet>()(*item_set)] = state_index;
for (auto transition : item_set->sym_transitions(grammar)) {
rules::sym_ptr symbol = static_pointer_cast<const rules::Symbol>(transition.first);
size_t new_state_index = add_item_set(transition.second);
table.add_action(state_index, symbol->name, ParseAction::Shift(new_state_index));
}
for (Item item : *item_set) {
if (item.is_done()) {
if (item.rule_name == ParseTable::START) {
table.add_action(state_index, ParseTable::END_OF_INPUT, ParseAction::Accept());
} else {
for (string rule_name : table.symbol_names)
table.add_action(state_index, rule_name, ParseAction::Reduce(item.rule_name, item.consumed_sym_count));
}
}
}
}
return state_index;
}
long ParseTableBuilder::state_index_for_item_set(const ItemSet &item_set) const {
auto entry = state_indices.find(std::hash<ItemSet>()(item_set));
return (entry == state_indices.end()) ? NOT_FOUND : entry->second;
}
}
}