stuff

buildfiles/app/node_modules/eslint/lib/rules/no-invalid-regexp.js

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+/**
+ * @fileoverview Validate strings passed to the RegExp constructor
+ * @author Michael Ficarra
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const RegExpValidator = require("regexpp").RegExpValidator;
+const validator = new RegExpValidator({ ecmaVersion: 2018 });
+const validFlags = /[gimuys]/gu;
+const undefined1 = void 0;
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "disallow invalid regular expression strings in `RegExp` constructors",
+            category: "Possible Errors",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/no-invalid-regexp"
+        },
+
+        schema: [{
+            type: "object",
+            properties: {
+                allowConstructorFlags: {
+                    type: "array",
+                    items: {
+                        type: "string"
+                    }
+                }
+            },
+            additionalProperties: false
+        }],
+
+        messages: {
+            regexMessage: "{{message}}."
+        }
+    },
+
+    create(context) {
+
+        const options = context.options[0];
+        let allowedFlags = null;
+
+        if (options && options.allowConstructorFlags) {
+            const temp = options.allowConstructorFlags.join("").replace(validFlags, "");
+
+            if (temp) {
+                allowedFlags = new RegExp(`[${temp}]`, "giu");
+            }
+        }
+
+        /**
+         * Check if node is a string
+         * @param {ASTNode} node node to evaluate
+         * @returns {boolean} True if its a string
+         * @private
+         */
+        function isString(node) {
+            return node && node.type === "Literal" && typeof node.value === "string";
+        }
+
+        /**
+         * Check syntax error in a given pattern.
+         * @param {string} pattern The RegExp pattern to validate.
+         * @param {boolean} uFlag The Unicode flag.
+         * @returns {string|null} The syntax error.
+         */
+        function validateRegExpPattern(pattern, uFlag) {
+            try {
+                validator.validatePattern(pattern, undefined1, undefined1, uFlag);
+                return null;
+            } catch (err) {
+                return err.message;
+            }
+        }
+
+        /**
+         * Check syntax error in a given flags.
+         * @param {string} flags The RegExp flags to validate.
+         * @returns {string|null} The syntax error.
+         */
+        function validateRegExpFlags(flags) {
+            try {
+                validator.validateFlags(flags);
+                return null;
+            } catch {
+                return `Invalid flags supplied to RegExp constructor '${flags}'`;
+            }
+        }
+
+        return {
+            "CallExpression, NewExpression"(node) {
+                if (node.callee.type !== "Identifier" || node.callee.name !== "RegExp" || !isString(node.arguments[0])) {
+                    return;
+                }
+                const pattern = node.arguments[0].value;
+                let flags = isString(node.arguments[1]) ? node.arguments[1].value : "";
+
+                if (allowedFlags) {
+                    flags = flags.replace(allowedFlags, "");
+                }
+
+                // If flags are unknown, check both are errored or not.
+                const message = validateRegExpFlags(flags) || (
+                    flags
+                        ? validateRegExpPattern(pattern, flags.indexOf("u") !== -1)
+                        : validateRegExpPattern(pattern, true) && validateRegExpPattern(pattern, false)
+                );
+
+                if (message) {
+                    context.report({
+                        node,
+                        messageId: "regexMessage",
+                        data: { message }
+                    });
+                }
+            }
+        };
+    }
+};