e6d018a88d
This is related to my last commit. I've updated all the JavaScript files to satisfy 'eslint-config-futagozaryuu', my eslint configuration. I'm sure I've probally missed something, but I've run all NPM scripts and Gulp tasks, fixed any bugs that cropped up, and updated some stuff (mainly related to generated messages), so as far as I can, tell this conversion is over (I know I've probally jixed it just by saying this ;P).
44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
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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// Reports expressions that don't consume any input inside |*| or |+| in the
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// grammar, which prevents infinite loops in the generated parser.
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function reportInfiniteRepetition( ast ) {
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const check = visitor.build( {
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zero_or_more( node ) {
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if ( ! asts.alwaysConsumesOnSuccess( ast, node.expression ) ) {
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throw new GrammarError(
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"Possible infinite loop when parsing (repetition used with an expression that may not consume any input).",
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node.location
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);
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}
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},
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one_or_more( node ) {
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if ( ! asts.alwaysConsumesOnSuccess( ast, node.expression ) ) {
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throw new GrammarError(
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"Possible infinite loop when parsing (repetition used with an expression that may not consume any input).",
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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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}
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module.exports = reportInfiniteRepetition;
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