107 lines
3.1 KiB
JavaScript
107 lines
3.1 KiB
JavaScript
/**
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* @fileoverview Validate strings passed to the RegExp constructor
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* @author Michael Ficarra
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const espree = require("espree");
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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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docs: {
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description: "disallow invalid regular expression strings in `RegExp` constructors",
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category: "Possible Errors",
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recommended: true
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},
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schema: [{
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type: "object",
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properties: {
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allowConstructorFlags: {
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type: "array",
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items: {
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type: "string"
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}
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}
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},
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additionalProperties: false
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}]
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},
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create(context) {
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const options = context.options[0];
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let allowedFlags = "";
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if (options && options.allowConstructorFlags) {
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allowedFlags = options.allowConstructorFlags.join("");
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}
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/**
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* Check if node is a string
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* @param {ASTNode} node node to evaluate
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* @returns {boolean} True if its a string
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* @private
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*/
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function isString(node) {
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return node && node.type === "Literal" && typeof node.value === "string";
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}
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/**
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* Validate strings passed to the RegExp constructor
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* @param {ASTNode} node node to evaluate
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* @returns {void}
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* @private
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*/
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function check(node) {
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if (node.callee.type === "Identifier" && node.callee.name === "RegExp" && isString(node.arguments[0])) {
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let flags = isString(node.arguments[1]) ? node.arguments[1].value : "";
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if (allowedFlags) {
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flags = flags.replace(new RegExp(`[${allowedFlags}]`, "gi"), "");
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}
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try {
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void new RegExp(node.arguments[0].value);
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} catch (e) {
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context.report({
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node,
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message: "{{message}}.",
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data: e
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});
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}
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if (flags) {
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try {
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espree.parse(`/./${flags}`, context.parserOptions);
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} catch (ex) {
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context.report({
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node,
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message: "Invalid flags supplied to RegExp constructor '{{flags}}'.",
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data: {
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flags
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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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return {
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CallExpression: check,
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NewExpression: check
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};
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}
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};
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