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/**
* @fileoverview Rule to count multiple spaces in regular expressions
* @author Matt DuVall <http://www.mattduvall.com/>
*/
"use strict";
const astUtils = require("../util/ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "suggestion",
docs: {
description: "disallow multiple spaces in regular expressions",
category: "Possible Errors",
recommended: true,
url: "https://eslint.org/docs/rules/no-regex-spaces"
},
schema: [],
fixable: "code"
},
create(context) {
const sourceCode = context.getSourceCode();
/**
* Validate regular expressions
* @param {ASTNode} node node to validate
* @param {string} value regular expression to validate
* @param {number} valueStart The start location of the regex/string literal. It will always be the case that
* `sourceCode.getText().slice(valueStart, valueStart + value.length) === value`
* @returns {void}
* @private
*/
function checkRegex(node, value, valueStart) {
const multipleSpacesRegex = /( {2,})( [+*{?]|[^+*{?]|$)/u,
regexResults = multipleSpacesRegex.exec(value);
if (regexResults !== null) {
const count = regexResults[1].length;
context.report({
node,
message: "Spaces are hard to count. Use {{{count}}}.",
data: { count },
fix(fixer) {
return fixer.replaceTextRange(
[valueStart + regexResults.index, valueStart + regexResults.index + count],
` {${count}}`
);
}
});
/*
* TODO: (platinumazure) Fix message to use rule message
* substitution when api.report is fixed in lib/eslint.js.
*/
}
}
/**
* Validate regular expression literals
* @param {ASTNode} node node to validate
* @returns {void}
* @private
*/
function checkLiteral(node) {
const token = sourceCode.getFirstToken(node),
nodeType = token.type,
nodeValue = token.value;
if (nodeType === "RegularExpression") {
checkRegex(node, nodeValue, token.range[0]);
}
}
/**
* 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) {
const scope = context.getScope();
const regExpVar = astUtils.getVariableByName(scope, "RegExp");
const shadowed = regExpVar && regExpVar.defs.length > 0;
if (node.callee.type === "Identifier" && node.callee.name === "RegExp" && isString(node.arguments[0]) && !shadowed) {
checkRegex(node, node.arguments[0].value, node.arguments[0].range[0] + 1);
}
}
return {
Literal: checkLiteral,
CallExpression: checkFunction,
NewExpression: checkFunction
};
}
};