traxys/tree-sitter
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In LR(1) items, only store consumed symbols as booleans

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the booleans represent the symbols point to auxiliary tokens
or not. This is all we need to know for the purpose of building
parse tables. Any other information just leads to redundant
parse states.
This commit is contained in:
Max Brunsfeld 2014-01-31 00:13:05 -08:00
parent 0d3a941848
commit 5ed5ae7514
11 changed files with 660 additions and 993 deletions
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10
src/compiler/build_tables/perform.cpp
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@ -61,20 +61,12 @@ namespace tree_sitter {
}
}
static vector<bool> reduce_flags(const vector<rules::Symbol> &child_symbols) {
vector<bool> result;
for (auto symbol : child_symbols) {
result.push_back(symbol.is_auxiliary);
}
return result;
}
void add_reduce_actions(const ParseItemSet &item_set, size_t state_index) {
for (ParseItem item : item_set) {
if (item.is_done()) {
ParseAction action = (item.lhs.name == START) ?
ParseAction::Accept() :
ParseAction::Reduce(item.lhs, reduce_flags(item.consumed_symbols));
ParseAction::Reduce(item.lhs, item.consumed_symbols);
parse_table.add_action(state_index, item.lookahead_sym, action);
}
}