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PR-URL: https://github.com/iojs/io.js/pull/1539 Fixes: https://github.com/iojs/io.js/issues/1253 Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com> Reviewed-By: Trevor Norris <trev.norris@gmail.com> Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Chris Dickinson <christopher.s.dickinson@gmail.com> Reviewed-By: Johan Bergström <bugs@bergstroem.nu> Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
84 lines
2.4 KiB
JavaScript
84 lines
2.4 KiB
JavaScript
/**
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* @fileoverview Rule to flag duplicate arguments
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* @author Jamund Ferguson
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* @copyright 2015 Jamund Ferguson. All rights reserved.
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = function(context) {
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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/**
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* Determines if a given node has duplicate parameters.
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* @param {ASTNode} node The node to check.
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* @returns {void}
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* @private
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*/
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function checkParams(node) {
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var params = {},
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dups = {};
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/**
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* Marks a given param as either seen or duplicated.
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* @param {string} name The name of the param to mark.
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* @returns {void}
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* @private
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*/
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function markParam(name) {
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if (params.hasOwnProperty(name)) {
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dups[name] = 1;
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} else {
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params[name] = 1;
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}
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}
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// loop through and find each duplicate param
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node.params.forEach(function(param) {
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switch (param.type) {
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case "Identifier":
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markParam(param.name);
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break;
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case "ObjectPattern":
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param.properties.forEach(function(property) {
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markParam(property.key.name);
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});
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break;
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case "ArrayPattern":
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param.elements.forEach(function(element) {
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markParam(element.name);
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});
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break;
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// no default
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}
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});
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// log an error for each duplicate (not 2 for each)
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Object.keys(dups).forEach(function(currentParam) {
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context.report(node, "Duplicate param '{{key}}'.", { key: currentParam });
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});
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}
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//--------------------------------------------------------------------------
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// Public API
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//--------------------------------------------------------------------------
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return {
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"FunctionDeclaration": checkParams,
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"FunctionExpression": checkParams
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};
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};
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