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codeql-action/node_modules/eslint/lib/rules/no-nonoctal-decimal-escape.js
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/** | |
* @fileoverview Rule to disallow `\8` and `\9` escape sequences in string literals. | |
* @author Milos Djermanovic | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Helpers | |
//------------------------------------------------------------------------------ | |
const QUICK_TEST_REGEX = /\\[89]/u; | |
/** | |
* Returns unicode escape sequence that represents the given character. | |
* @param {string} character A single code unit. | |
* @returns {string} "\uXXXX" sequence. | |
*/ | |
function getUnicodeEscape(character) { | |
return `\\u${character.charCodeAt(0).toString(16).padStart(4, "0")}`; | |
} | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Disallow `\\8` and `\\9` escape sequences in string literals", | |
recommended: true, | |
url: "https://eslint.org/docs/latest/rules/no-nonoctal-decimal-escape" | |
}, | |
hasSuggestions: true, | |
schema: [], | |
messages: { | |
decimalEscape: "Don't use '{{decimalEscape}}' escape sequence.", | |
// suggestions | |
refactor: "Replace '{{original}}' with '{{replacement}}'. This maintains the current functionality.", | |
escapeBackslash: "Replace '{{original}}' with '{{replacement}}' to include the actual backslash character." | |
} | |
}, | |
create(context) { | |
const sourceCode = context.sourceCode; | |
/** | |
* Creates a new Suggestion object. | |
* @param {string} messageId "refactor" or "escapeBackslash". | |
* @param {int[]} range The range to replace. | |
* @param {string} replacement New text for the range. | |
* @returns {Object} Suggestion | |
*/ | |
function createSuggestion(messageId, range, replacement) { | |
return { | |
messageId, | |
data: { | |
original: sourceCode.getText().slice(...range), | |
replacement | |
}, | |
fix(fixer) { | |
return fixer.replaceTextRange(range, replacement); | |
} | |
}; | |
} | |
return { | |
Literal(node) { | |
if (typeof node.value !== "string") { | |
return; | |
} | |
if (!QUICK_TEST_REGEX.test(node.raw)) { | |
return; | |
} | |
const regex = /(?:[^\\]|(?<previousEscape>\\.))*?(?<decimalEscape>\\[89])/suy; | |
let match; | |
while ((match = regex.exec(node.raw))) { | |
const { previousEscape, decimalEscape } = match.groups; | |
const decimalEscapeRangeEnd = node.range[0] + match.index + match[0].length; | |
const decimalEscapeRangeStart = decimalEscapeRangeEnd - decimalEscape.length; | |
const decimalEscapeRange = [decimalEscapeRangeStart, decimalEscapeRangeEnd]; | |
const suggest = []; | |
// When `regex` is matched, `previousEscape` can only capture characters adjacent to `decimalEscape` | |
if (previousEscape === "\\0") { | |
/* | |
* Now we have a NULL escape "\0" immediately followed by a decimal escape, e.g.: "\0\8". | |
* Fixing this to "\08" would turn "\0" into a legacy octal escape. To avoid producing | |
* an octal escape while fixing a decimal escape, we provide different suggestions. | |
*/ | |
suggest.push( | |
createSuggestion( // "\0\8" -> "\u00008" | |
"refactor", | |
[decimalEscapeRangeStart - previousEscape.length, decimalEscapeRangeEnd], | |
`${getUnicodeEscape("\0")}${decimalEscape[1]}` | |
), | |
createSuggestion( // "\8" -> "\u0038" | |
"refactor", | |
decimalEscapeRange, | |
getUnicodeEscape(decimalEscape[1]) | |
) | |
); | |
} else { | |
suggest.push( | |
createSuggestion( // "\8" -> "8" | |
"refactor", | |
decimalEscapeRange, | |
decimalEscape[1] | |
) | |
); | |
} | |
suggest.push( | |
createSuggestion( // "\8" -> "\\8" | |
"escapeBackslash", | |
decimalEscapeRange, | |
`\\${decimalEscape}` | |
) | |
); | |
context.report({ | |
node, | |
loc: { | |
start: sourceCode.getLocFromIndex(decimalEscapeRangeStart), | |
end: sourceCode.getLocFromIndex(decimalEscapeRangeEnd) | |
}, | |
messageId: "decimalEscape", | |
data: { | |
decimalEscape | |
}, | |
suggest | |
}); | |
} | |
} | |
}; | |
} | |
}; |