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pegjs/lib/compiler/passes/report-missing-rules.js

22 lines
528 B
JavaScript

var GrammarError = require("../../grammar-error"),
asts = require("../asts"),
visitor = require("../visitor");
/* Checks that all referenced rules exist. */
function reportMissingRules(ast) {
var check = visitor.build({
rule_ref: function(node) {
if (!asts.findRule(ast, node.name)) {
throw new GrammarError(
"Referenced rule \"" + node.name + "\" does not exist.",
node.location
);
}
}
});
check(ast);
}
module.exports = reportMissingRules;