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