Current Dev State

static/js/ketcher2/node_modules/eslint/lib/rules/no-control-regex.js

@@ -0,0 +1,126 @@
+/**
+ * @fileoverview Rule to forbid control charactes from regular expressions.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow control characters in regular expressions",
+            category: "Possible Errors",
+            recommended: true
+        },
+
+        schema: []
+    },
+
+    create(context) {
+
+        /**
+         * Get the regex expression
+         * @param {ASTNode} node node to evaluate
+         * @returns {*} Regex if found else null
+         * @private
+         */
+        function getRegExp(node) {
+            if (node.value instanceof RegExp) {
+                return node.value;
+            } else if (typeof node.value === "string") {
+
+                const parent = context.getAncestors().pop();
+
+                if ((parent.type === "NewExpression" || parent.type === "CallExpression") &&
+                    parent.callee.type === "Identifier" && parent.callee.name === "RegExp"
+                ) {
+
+                    // there could be an invalid regular expression string
+                    try {
+                        return new RegExp(node.value);
+                    } catch (ex) {
+                        return null;
+                    }
+                }
+            }
+
+            return null;
+        }
+
+
+        const controlChar = /[\x00-\x1f]/g; // eslint-disable-line no-control-regex
+        const consecutiveSlashes = /\\+/g;
+        const consecutiveSlashesAtEnd = /\\+$/g;
+        const stringControlChar = /\\x[01][0-9a-f]/ig;
+        const stringControlCharWithoutSlash = /x[01][0-9a-f]/ig;
+
+        /**
+         * Return a list of the control characters in the given regex string
+         * @param {string} regexStr regex as string to check
+         * @returns {array} returns a list of found control characters on given string
+         * @private
+         */
+        function getControlCharacters(regexStr) {
+
+            // check control characters, if RegExp object used
+            const controlChars = regexStr.match(controlChar) || [];
+
+            let stringControlChars = [];
+
+            // check substr, if regex literal used
+            const subStrIndex = regexStr.search(stringControlChar);
+
+            if (subStrIndex > -1) {
+
+                // is it escaped, check backslash count
+                const possibleEscapeCharacters = regexStr.slice(0, subStrIndex).match(consecutiveSlashesAtEnd);
+
+                const hasControlChars = possibleEscapeCharacters === null || !(possibleEscapeCharacters[0].length % 2);
+
+                if (hasControlChars) {
+                    stringControlChars = regexStr.slice(subStrIndex, -1)
+                        .split(consecutiveSlashes)
+                        .filter(Boolean)
+                        .map(x => {
+                            const match = x.match(stringControlCharWithoutSlash) || [x];
+
+                            return `\\${match[0]}`;
+                        });
+                }
+            }
+
+            return controlChars.map(x => {
+                const hexCode = `0${x.charCodeAt(0).toString(16)}`.slice(-2);
+
+                return `\\x${hexCode}`;
+            }).concat(stringControlChars);
+        }
+
+        return {
+            Literal(node) {
+                const regex = getRegExp(node);
+
+                if (regex) {
+                    const computedValue = regex.toString();
+
+                    const controlCharacters = getControlCharacters(computedValue);
+
+                    if (controlCharacters.length > 0) {
+                        context.report({
+                            node,
+                            message: "Unexpected control character(s) in regular expression: {{controlChars}}.",
+                            data: {
+                                controlChars: controlCharacters.join(", ")
+                            }
+                        });
+                    }
+                }
+            }
+        };
+
+    }
+};