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node_modules/eslint/lib/rules/no-octal-escape.js

@@ -0,0 +1,53 @@
+/**
+ * @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] },
+					});
+				}
+			},
+		};
+	},
+};