1 | /**
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2 | * @fileoverview Rule to flag octal escape sequences in string literals.
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3 | * @author Ian Christian Myers
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4 | */
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5 |
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6 | ;
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7 |
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8 | //------------------------------------------------------------------------------
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9 | // Rule Definition
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10 | //------------------------------------------------------------------------------
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11 |
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12 | module.exports = {
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13 | meta: {
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14 | type: "suggestion",
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15 |
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16 | docs: {
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17 | description: "disallow octal escape sequences in string literals",
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18 | category: "Best Practices",
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19 | recommended: false,
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20 | url: "https://eslint.org/docs/rules/no-octal-escape"
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21 | },
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22 |
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23 | schema: [],
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24 |
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25 | messages: {
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26 | octalEscapeSequence: "Don't use octal: '\\{{sequence}}'. Use '\\u....' instead."
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27 | }
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28 | },
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29 |
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30 | create(context) {
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31 |
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32 | return {
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33 |
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34 | Literal(node) {
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35 | if (typeof node.value !== "string") {
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36 | return;
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37 | }
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38 |
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39 | // \0 represents a valid NULL character if it isn't followed by a digit.
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40 | const match = node.raw.match(
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41 | /^(?:[^\\]|\\.)*?\\([0-3][0-7]{1,2}|[4-7][0-7]|0(?=[89])|[1-7])/su
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42 | );
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43 |
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44 | if (match) {
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45 | context.report({
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46 | node,
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47 | messageId: "octalEscapeSequence",
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48 | data: { sequence: match[1] }
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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 |
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55 | }
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56 | };
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