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Viewing file:     no-octal-escape.js (1.15 KB)      -rw-r--r--

/**
 * @fileoverview Rule to flag octal escape sequences in string literals.
 * @author Ian Christian Myers
 */

"use strict";

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../types').Rule.RuleModule} */
module.exports = {
	meta: {
		type: "suggestion",

		docs: {
			description: "Disallow octal escape sequences in string literals",
			recommended: false,
			url: "https://eslint.org/docs/latest/rules/no-octal-escape",
		},

		schema: [],

		messages: {
			octalEscapeSequence:
				"Don't use octal: '\\{{sequence}}'. Use '\\u....' instead.",
		},
	},

	create(context) {
		return {
			Literal(node) {
				if (typeof node.value !== "string") {
					return;
				}

				// \0 represents a valid NULL character if it isn't followed by a digit.
				const match = node.raw.match(
					/^(?:[^\\]|\\.)*?\\([0-3][0-7]{1,2}|[4-7][0-7]|0(?=[89])|[1-7])/su,
				);

				if (match) {
					context.report({
						node,
						messageId: "octalEscapeSequence",
						data: { sequence: match[1] },
					});
				}
			},
		};
	},
};