Revert "Revert "PEG Parser: under review at http://codereview.chromium.org/8399029""

client/dom/scripts/idlrenderer.dart

Index: client/dom/scripts/idlrenderer.dart
diff --git a/client/dom/scripts/idlrenderer.dart b/client/dom/scripts/idlrenderer.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4b81f0e7db87d9f0f8b28d32d54cde602824ecff
--- /dev/null
+++ b/client/dom/scripts/idlrenderer.dart
@@ -0,0 +1,181 @@
+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+List sorted(Iterable input, [compare, key]) {
+  comparator(compare, key) {
+    if (compare == null && key == null)
+      return (a, b) => a.compareTo(b);
+    if (compare == null)
+      return (a, b) => key(a).compareTo(key(b));
+    if (key == null)
+      return compare;
+    return (a, b) => compare(key(a), key(b));
+  }
+  List copy = new List.from(input);
+  copy.sort(comparator(compare, key));
+  return copy;
+}
+
+render(idl_node, [indent_str='  ']) {
+  var output = [''];
+  var indent_stack = [];
+
+  //indented(action()) {
+  indented(action) {
+    indent_stack.add(indent_str);
+    action();
+    indent_stack.removeLast();
+  }
+
+  sort(nodes) => sorted(nodes, key: (a) => a.id);
+
+  var w; // For some reason mutually recursive local functions don't work.
+
+  wln([node=null]) {
+    w(node);
+    output.add('\n');
+  }
+
+  w = (node, [list_separator]) {
+    /*
+     Writes the given node.
+
+    Args:
+      node -- a string, IDLNode instance or a list of such.
+      list_separator -- if provided, and node is a list,
+        list_separator will be written between the list items.
+    */
+    if (node == null) {
+      return;
+    } else if (node is String) {
+      if (output.last().endsWith('\n'))
+        output.addAll(indent_stack);
+      output.add(node);
+    } else if (node is List) {
+      var separator = null;
+      for (var element in node) {
+        w(separator);
+        separator = list_separator;
+        w(element);
+      }
+    } else if (node is IDLFile) {
+      w(node.modules);
+      w(node.interfaces);
+    } else if (node is IDLModule) {
+      w(node.annotations);
+      w(node.extAttrs);
+      wln('module ${node.id} {');
+      indented(() {
+          w(node.interfaces);
+          w(node.typedefs);
+        });
+      wln('};');
+    } else if (node is IDLInterface) {
+      w(node.annotations);
+      w(node.extAttrs);
+      w('interface ${node.id}');
+      indented(() {
+          if (!node.parents.isEmpty()) {
+            wln(' :');
+            w(node.parents, ',\n');
+          }
+          wln(' {');
+          section(list, comment) {
+            if (list != null && !list.isEmpty()) {
+              wln();
+              wln(comment);
+              w(sort(list));
+            }
+          }
+          section(node.constants, '/* Constants */');
+          section(node.attributes, '/* Attributes */');
+          section(node.operations, '/* Operations */');
+          section(node.snippets, '/* Snippets */');
+        });
+      wln('};');
+    } else if (node is IDLParentInterface) {
+      w(node.annotations);
+      w(node.type.id);
+    } else if (node is IDLAnnotations) {
+      for (var name in sorted(node.map.getKeys())) {
+        IDLAnnotation annotation = node.map[name];
+        var args = annotation.map;
+        if (args.isEmpty()) {
+          w('@$name');
+        } else {
+          var formattedArgs = [];
+          for (var argName in sorted(args.getKeys())) {
+            var argValue = args[argName];
+            if (argValue == null)
+              formattedArgs.add(argName);
+            else
+              formattedArgs.add('$argName=$argValue');
+          }
+          w('@$name(${Strings.join(formattedArgs,',')})');
+        }
+        w(' ');
+      }
+    } else if (node is IDLExtAttrs) {
+      if(!node.map.isEmpty()) {
+        w('[');
+        var sep = null;
+        for (var name in sorted(node.map.getKeys())) {
+          w(sep);
+          sep = ', ';
+          w(name);
+          var value = node.map[name];
+          if (value != null) {
+            w('=');
+            w(value);
+          }
+        }
+        w('] ');
+      }
+    } else if (node is IDLAttribute) {
+      w(node.annotations);
+      w(node.extAttrs);
+      if (node.isFcGetter)
+        w('getter ');
+      if (node.isFcSetter)
+        w('setter ');
+      wln('attribute ${node.type.id} ${node.id};');
+    } else if (node is IDLConstant) {
+      w(node.annotations);
+      w(node.extAttrs);
+      wln('const ${node.type.id} ${node.id} = ${node.value};');
+    } else if (node is IDLSnippet) {
+      w(node.annotations);
+      wln('snippet {${node.text}};');
+    } else if (node is IDLOperation) {
+      w(node.annotations);
+      w(node.extAttrs);
+      if (node.specials != null && !node.specials.isEmpty()) {
+        w(node.specials, ' ');
+        w(' ');
+      }
+      w('${node.type.id} ${node.id}');
+      w('(');
+      w(node.arguments, ', ');
+      wln(');');
+    } else if (node is IDLArgument) {
+      w(node.extAttrs);
+      w('in ');
+      if (node.isOptional)
+        w('optional ');
+      w('${node.type.id} ${node.id}');
+    } else if (node is IDLExtAttrFunctionValue) {
+      w(node.name);
+      w('(');
+      w(node.arguments, ', ');
+      w(')');
+    } else if (node is IDLTypeDef) {
+      wln('typedef ${node.type.id} ${node.id};');
+    } else {
+      w('// $node\n');
+    }
+  };
+
+  w(idl_node);
+  return Strings.concatAll(output);
+}