1 files changed, 114 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-regex-spaces.js b/tools/node_modules/eslint/lib/rules/no-regex-spaces.js
new file mode 100644
index 0000000000..9250437caa
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-regex-spaces.js
@@ -0,0 +1,114 @@
+/**
+ * @fileoverview Rule to count multiple spaces in regular expressions
+ * @author Matt DuVall <http://www.mattduvall.com/>
+ */
+
+"use strict";
+
+const astUtils = require("../ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow multiple spaces in regular expressions",
+            category: "Possible Errors",
+            recommended: true
+        },
+
+        schema: [],
+
+        fixable: "code"
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Validate regular expressions
+         * @param {ASTNode} node node to validate
+         * @param {string} value regular expression to validate
+         * @param {number} valueStart The start location of the regex/string literal. It will always be the case that
+         * `sourceCode.getText().slice(valueStart, valueStart + value.length) === value`
+         * @returns {void}
+         * @private
+         */
+        function checkRegex(node, value, valueStart) {
+            const multipleSpacesRegex = /( {2,})( [+*{?]|[^+*{?]|$)/,
+                regexResults = multipleSpacesRegex.exec(value);
+
+            if (regexResults !== null) {
+                const count = regexResults[1].length;
+
+                context.report({
+                    node,
+                    message: "Spaces are hard to count. Use {{{count}}}.",
+                    data: { count },
+                    fix(fixer) {
+                        return fixer.replaceTextRange(
+                            [valueStart + regexResults.index, valueStart + regexResults.index + count],
+                            ` {${count}}`
+                        );
+                    }
+                });
+
+                /*
+                 * TODO: (platinumazure) Fix message to use rule message
+                 * substitution when api.report is fixed in lib/eslint.js.
+                 */
+            }
+        }
+
+        /**
+         * Validate regular expression literals
+         * @param {ASTNode} node node to validate
+         * @returns {void}
+         * @private
+         */
+        function checkLiteral(node) {
+            const token = sourceCode.getFirstToken(node),
+                nodeType = token.type,
+                nodeValue = token.value;
+
+            if (nodeType === "RegularExpression") {
+                checkRegex(node, nodeValue, token.range[0]);
+            }
+        }
+
+        /**
+         * 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";
+        }
+
+        /**
+         * Validate strings passed to the RegExp constructor
+         * @param {ASTNode} node node to validate
+         * @returns {void}
+         * @private
+         */
+        function checkFunction(node) {
+            const scope = context.getScope();
+            const regExpVar = astUtils.getVariableByName(scope, "RegExp");
+            const shadowed = regExpVar && regExpVar.defs.length > 0;
+
+            if (node.callee.type === "Identifier" && node.callee.name === "RegExp" && isString(node.arguments[0]) && !shadowed) {
+                checkRegex(node, node.arguments[0].value, node.arguments[0].range[0] + 1);
+            }
+        }
+
+        return {
+            Literal: checkLiteral,
+            CallExpression: checkFunction,
+            NewExpression: checkFunction
+        };
+
+    }
+};