114 lines
3.1 KiB
JavaScript
114 lines
3.1 KiB
JavaScript
/**
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* @fileoverview Rule to forbid control charactes from regular expressions.
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* @author Nicholas C. Zakas
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*/
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"use strict";
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const RegExpValidator = require("regexpp").RegExpValidator;
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const collector = new (class {
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constructor() {
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this.ecmaVersion = 2018;
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this._source = "";
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this._controlChars = [];
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this._validator = new RegExpValidator(this);
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}
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onPatternEnter() {
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this._controlChars = [];
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}
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onCharacter(start, end, cp) {
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if (cp >= 0x00 &&
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cp <= 0x1F &&
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(
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this._source.codePointAt(start) === cp ||
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this._source.slice(start, end).startsWith("\\x") ||
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this._source.slice(start, end).startsWith("\\u")
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)
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) {
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this._controlChars.push(`\\x${`0${cp.toString(16)}`.slice(-2)}`);
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}
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}
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collectControlChars(regexpStr) {
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try {
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this._source = regexpStr;
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this._validator.validatePattern(regexpStr); // Call onCharacter hook
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} catch (err) {
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// Ignore syntax errors in RegExp.
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}
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return this._controlChars;
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}
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})();
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "disallow control characters in regular expressions",
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category: "Possible Errors",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-control-regex"
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},
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schema: [],
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messages: {
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unexpected: "Unexpected control character(s) in regular expression: {{controlChars}}."
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}
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},
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create(context) {
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/**
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* Get the regex expression
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* @param {ASTNode} node node to evaluate
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* @returns {RegExp|null} Regex if found else null
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* @private
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*/
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function getRegExpPattern(node) {
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if (node.regex) {
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return node.regex.pattern;
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}
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if (typeof node.value === "string" &&
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(node.parent.type === "NewExpression" || node.parent.type === "CallExpression") &&
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node.parent.callee.type === "Identifier" &&
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node.parent.callee.name === "RegExp" &&
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node.parent.arguments[0] === node
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) {
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return node.value;
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}
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return null;
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}
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return {
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Literal(node) {
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const pattern = getRegExpPattern(node);
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if (pattern) {
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const controlCharacters = collector.collectControlChars(pattern);
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if (controlCharacters.length > 0) {
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context.report({
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node,
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messageId: "unexpected",
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data: {
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controlChars: controlCharacters.join(", ")
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}
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});
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}
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}
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}
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};
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}
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};
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