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Add PREC_DYNAMIC rule for resolving runtime ambiguities

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This commit is contained in:
Max Brunsfeld 2017-07-06 15:20:11 -07:00
parent cb652239f6
commit d8e9d04fe7
24 changed files with 316 additions and 83 deletions
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14
src/compiler/parse_grammar.cc
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@ -184,6 +184,20 @@ ParseRuleResult parse_rule(json_value *rule_json) {
return Rule(Metadata::prec_right(precedence_json.u.integer, result.rule));
}
if (type == "PREC_DYNAMIC") {
json_value precedence_json = rule_json->operator[]("value");
if (precedence_json.type != json_integer) {
return "Precedence value must be an integer";
}
json_value content_json = rule_json->operator[]("content");
auto result = parse_rule(&content_json);
if (!result.error_message.empty()) {
return "Invalid precedence content: " + result.error_message;
}
return Rule(Metadata::prec_dynamic(precedence_json.u.integer, result.rule));
}
return "Unknown rule type: " + type;
}