1 files changed, 92 insertions, 0 deletions
diff --git a/tools/eslint/lib/rules/no-irregular-whitespace.js b/tools/eslint/lib/rules/no-irregular-whitespace.js
new file mode 100644
index 0000000000..3599f0cecd
--- /dev/null
+++ b/tools/eslint/lib/rules/no-irregular-whitespace.js
@@ -0,0 +1,92 @@
+/**
+ * @fileoverview Rule to disalow whitespace that is not a tab or space, whitespace inside strings and comments are allowed
+ * @author Jonathan Kingston
+ * @copyright 2014 Jonathan Kingston. All rights reserved.
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = function(context) {
+
+    var irregularWhitespace = /[\u0085\u00A0\ufeff\f\v\u00a0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u202f\u205f\u3000]+/mg;
+
+    // Module store of errors that we have found
+    var errors = [];
+
+    /**
+     * Removes errors that occur inside a string node
+     * @param {ASTNode} node to check for matching errors.
+     * @returns {void}
+     * @private
+     */
+    function removeStringError(node) {
+        var locStart = node.loc.start;
+        var locEnd = node.loc.end;
+
+        errors = errors.filter(function (error) {
+            var errorLoc = error[1];
+            if (errorLoc.line >= locStart.line && errorLoc.line <= locEnd.line) {
+                if (errorLoc.column >= locStart.column && errorLoc.column <= locEnd.column) {
+                    return false;
+                }
+            }
+            return true;
+        });
+    }
+
+    /**
+     * Checks nodes for errors that we are choosing to ignore and calls the relevent methods to remove the errors
+     * @param {ASTNode} node to check for matching errors.
+     * @returns {void}
+     * @private
+     */
+    function removeInvalidNodeErrors(node) {
+        if (typeof node.value === "string") {
+            // If we have irregular characters remove them from the errors list
+            if (node.value.match(irregularWhitespace)) {
+                removeStringError(node);
+            }
+        }
+    }
+
+    return {
+        "Program": function (node) {
+            /**
+             * As we can easily fire warnings for all white space issues with all the source its simpler to fire them here
+             * This means we can check all the application code without having to worry about issues caused in the parser tokens
+             * When writing this code also evaluating per node was missing out connecting tokens in some cases
+             * We can later filter the errors when they are found to be not an issue in nodes we don't care about
+             */
+            var sourceLines = context.getSourceLines();
+
+            sourceLines.forEach(function (sourceLine, lineIndex) {
+                var location,
+                    match = irregularWhitespace.exec(sourceLine);
+
+                if (match !== null) {
+                    location = {
+                        line: lineIndex + 1,
+                        column: match.index
+                    };
+
+                    errors.push([node, location, "Irregular whitespace not allowed"]);
+                }
+            });
+        },
+        "Identifier": removeInvalidNodeErrors,
+        "Literal": removeInvalidNodeErrors,
+        "Statement": removeInvalidNodeErrors,
+        "Expression": removeInvalidNodeErrors,
+        "Program:exit": function () {
+
+            // If we have any errors remaining report on them
+            errors.forEach(function (error) {
+                context.report.apply(this, error);
+            });
+        }
+    };
+};