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Make repeat rules left-recursive instead of right recursive

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This commit is contained in:
Max Brunsfeld 2016-04-18 12:40:14 -07:00
parent 0ea2962fbe
commit cf19b2e58d
2 changed files with 21 additions and 21 deletions
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8
src/compiler/prepare_grammar/expand_repeats.cc
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@ -41,10 +41,10 @@ class ExpandRepeats : public rules::IdentityRuleFn {
string helper_rule_name = rule_name + "_repeat" + to_string(++repeat_count);
Symbol repeat_symbol(offset + index);
existing_repeats.push_back({ rule->copy(), repeat_symbol });
aux_rules.push_back(Variable(
helper_rule_name, VariableTypeAuxiliary,
Seq::build({ inner_rule, Choice::build({ repeat_symbol.copy(),
make_shared<Blank>() }) })));
aux_rules.push_back(
Variable(helper_rule_name, VariableTypeAuxiliary,
Choice::build({ Seq::build({ repeat_symbol.copy(), inner_rule }),
inner_rule })));
return repeat_symbol.copy();
}