36 lines
747 B
JavaScript
36 lines
747 B
JavaScript
"use strict";
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const __hasOwnProperty = Object.prototype.hasOwnProperty;
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// Checks that each rule is defined only once.
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function reportDuplicateRules( ast, session ) {
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const rules = {};
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const check = session.buildVisitor( {
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rule( node ) {
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const name = node.name;
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if ( __hasOwnProperty.call( rules, name ) ) {
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const start = rules[ name ].start;
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session.error(
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`Rule "${ name }" is already defined at line ${ start.line }, column ${ start.column }.`,
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node.location
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);
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}
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rules[ node.name ] = node.location;
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}
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} );
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check( ast );
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}
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module.exports = reportDuplicateRules;
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