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