/
no-regex-spaces.js
87 lines (74 loc) · 2.5 KB
/
no-regex-spaces.js
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/**
* @fileoverview Rule to count multiple spaces in regular expressions
* @author Matt DuVall <http://www.mattduvall.com/>
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow multiple spaces in regular expressions",
category: "Possible Errors",
recommended: true
},
schema: []
},
create: function(context) {
var sourceCode = context.getSourceCode();
/**
* Validate regular expressions
* @param {ASTNode} node node to validate
* @param {string} value regular expression to validate
* @returns {void}
* @private
*/
function checkRegex(node, value) {
var multipleSpacesRegex = /( {2,})+?/,
regexResults = multipleSpacesRegex.exec(value);
if (regexResults !== null) {
context.report(node, "Spaces are hard to count. Use {" + regexResults[0].length + "}.");
}
}
/**
* Validate regular expression literals
* @param {ASTNode} node node to validate
* @returns {void}
* @private
*/
function checkLiteral(node) {
var token = sourceCode.getFirstToken(node),
nodeType = token.type,
nodeValue = token.value;
if (nodeType === "RegularExpression") {
checkRegex(node, nodeValue);
}
}
/**
* Check if node is a string
* @param {ASTNode} node node to evaluate
* @returns {boolean} True if its a string
* @private
*/
function isString(node) {
return node && node.type === "Literal" && typeof node.value === "string";
}
/**
* Validate strings passed to the RegExp constructor
* @param {ASTNode} node node to validate
* @returns {void}
* @private
*/
function checkFunction(node) {
if (node.callee.type === "Identifier" && node.callee.name === "RegExp" && isString(node.arguments[0])) {
checkRegex(node, node.arguments[0].value);
}
}
return {
Literal: checkLiteral,
CallExpression: checkFunction,
NewExpression: checkFunction
};
}
};