first commit

build/node_modules/css-tree/lib/lexer/grammar/walk.js

@@ -0,0 +1,31 @@
+'use strict';
+
+module.exports = function walk(node, fn, context) {
+    switch (node.type) {
+        case 'Group':
+            node.terms.forEach(function(term) {
+                walk(term, fn, context);
+            });
+            break;
+
+        case 'Function':
+        case 'Parentheses':
+            walk(node.children, fn, context);
+            break;
+
+        case 'Keyword':
+        case 'Type':
+        case 'Property':
+        case 'Combinator':
+        case 'Comma':
+        case 'Slash':
+        case 'String':
+        case 'Percent':
+            break;
+
+        default:
+            throw new Error('Unknown type: ' + node.type);
+    }
+
+    fn.call(context, node);
+};