1 | 'use strict';
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2 | const safeRegex = require('safe-regex');
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3 | const getDocumentationUrl = require('./utils/get-documentation-url');
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4 |
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5 | const message = 'Unsafe regular expression.';
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6 |
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7 | const create = context => {
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8 | return {
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9 | 'Literal[regex]': node => {
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10 |
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11 | if (
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12 | node.parent.type === 'NewExpression' &&
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13 | node.parent.callee.name === 'RegExp'
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14 | ) {
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15 | return;
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16 | }
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17 |
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18 | if (!safeRegex(node.value)) {
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19 | context.report({
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20 | node,
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21 | message
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22 | });
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23 | }
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24 | },
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25 | 'NewExpression[callee.name="RegExp"]': node => {
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26 | const arguments_ = node.arguments;
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27 |
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28 | if (arguments_.length === 0 || arguments_[0].type !== 'Literal') {
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29 | return;
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30 | }
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31 |
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32 | const hasRegExp = arguments_[0].regex;
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33 |
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34 | let pattern;
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35 | let flags;
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36 | if (hasRegExp) {
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37 | ({pattern} = arguments_[0].regex);
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38 | flags = arguments_[1] && arguments_[1].type === 'Literal' ? arguments_[1].value : arguments_[0].regex.flags;
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39 | } else {
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40 | pattern = arguments_[0].value;
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41 | flags = arguments_[1] && arguments_[1].type === 'Literal' ? arguments_[1].value : '';
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42 | }
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43 |
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44 | if (!safeRegex(`/${pattern}/${flags}`)) {
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45 | context.report({
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46 | node,
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47 | message
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48 | });
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49 | }
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50 | }
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51 | };
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52 | };
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53 |
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54 | module.exports = {
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55 | create,
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56 | meta: {
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57 | type: 'problem',
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58 | docs: {
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59 | url: getDocumentationUrl(__filename)
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60 | }
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61 | }
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62 | };
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