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

36 lines
662 B
JavaScript

"use strict";
// Checks that all referenced rules exist.
function reportUndefinedRules( ast, session, options ) {
const check = session.buildVisitor( {
rule_ref( node ) {
if ( ! ast.findRule( node.name ) ) {
session.error(
`Rule "${ node.name }" is not defined.`,
node.location
);
}
}
} );
check( ast );
options.allowedStartRules.forEach( rule => {
if ( ! ast.findRule( rule ) ) {
session.error( `Start rule "${ rule }" is not defined.` );
}
} );
}
module.exports = reportUndefinedRules;