Cleanup html events generation.

lib/html/scripts/htmleventgenerator.py

Index: lib/html/scripts/htmleventgenerator.py
diff --git a/lib/html/scripts/htmleventgenerator.py b/lib/html/scripts/htmleventgenerator.py
new file mode 100644
index 0000000000000000000000000000000000000000..fa0c103fc10290dbb9e18f2dc969273b5988da64
--- /dev/null
+++ b/lib/html/scripts/htmleventgenerator.py
@@ -0,0 +1,266 @@
+#!/usr/bin/python
+# Copyright (c) 2012, 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.
+
+"""This module provides functionality to generate dart:html event classes."""
+
+# Events without onEventName attributes in the  IDL we want to support.
+# We can automatically extract most event event names by checking for

[Anton Muhin, 2012/10/01 14:38:38]

nit: duplicate 'event event'

[podivilov1, 2012/10/02 12:09:15]

Done.

+# onEventName methods in the IDL but some events aren't listed so we need
+# to manually add them here so that they are easy for users to find.
+_html_manual_events = {
+  'Element': ['touchleave', 'touchenter', 'webkitTransitionEnd'],
+  'Window': ['DOMContentLoaded']
+}
+
+# These event names must be camel case when attaching event listeners
+# using addEventListener even though the onEventName properties in the DOM for
+# them are not camel case.
+_on_attribute_to_event_name_mapping = {
+  'webkitanimationend': 'webkitAnimationEnd',
+  'webkitanimationiteration': 'webkitAnimationIteration',
+  'webkitanimationstart': 'webkitAnimationStart',
+  'webkitspeechchange': 'webkitSpeechChange',
+  'webkittransitionend': 'webkitTransitionEnd',
+}
+
+# Mapping from raw event names to the pretty camelCase event names exposed as
+# properties in dart:html.  If the DOM exposes a new event name, you will need
+# to add the lower case to camel case conversion for that event name here.
+_html_event_names = {
+  'DOMContentLoaded': 'contentLoaded',
+  'abort': 'abort',
+  'addstream': 'addStream',
+  'addtrack': 'addTrack',
+  'audioend': 'audioEnd',
+  'audioprocess': 'audioProcess',
+  'audiostart': 'audioStart',
+  'beforecopy': 'beforeCopy',
+  'beforecut': 'beforeCut',
+  'beforepaste': 'beforePaste',
+  'beforeunload': 'beforeUnload',
+  'blocked': 'blocked',
+  'blur': 'blur',
+  'cached': 'cached',
+  'canplay': 'canPlay',
+  'canplaythrough': 'canPlayThrough',
+  'change': 'change',
+  'chargingchange': 'chargingChange',
+  'chargingtimechange': 'chargingTimeChange',
+  'checking': 'checking',
+  'click': 'click',
+  'close': 'close',
+  'complete': 'complete',
+  'connect': 'connect',
+  'connecting': 'connecting',
+  'contextmenu': 'contextMenu',
+  'copy': 'copy',
+  'cuechange': 'cueChange',
+  'cut': 'cut',
+  'dblclick': 'doubleClick',
+  'devicemotion': 'deviceMotion',
+  'deviceorientation': 'deviceOrientation',
+  'dischargingtimechange': 'dischargingTimeChange',
+  'display': 'display',
+  'downloading': 'downloading',
+  'drag': 'drag',
+  'dragend': 'dragEnd',
+  'dragenter': 'dragEnter',
+  'dragleave': 'dragLeave',
+  'dragover': 'dragOver',
+  'dragstart': 'dragStart',
+  'drop': 'drop',
+  'durationchange': 'durationChange',
+  'emptied': 'emptied',
+  'end': 'end',
+  'ended': 'ended',
+  'enter': 'enter',
+  'error': 'error',
+  'exit': 'exit',
+  'focus': 'focus',
+  'hashchange': 'hashChange',
+  'icecandidate': 'iceCandidate',
+  'icechange': 'iceChange',
+  'input': 'input',
+  'invalid': 'invalid',
+  'keydown': 'keyDown',
+  'keypress': 'keyPress',
+  'keyup': 'keyUp',
+  'levelchange': 'levelChange',
+  'load': 'load',
+  'loadeddata': 'loadedData',
+  'loadedmetadata': 'loadedMetadata',
+  'loadend': 'loadEnd',
+  'loadstart': 'loadStart',
+  'message': 'message',
+  'mousedown': 'mouseDown',
+  'mousemove': 'mouseMove',
+  'mouseout': 'mouseOut',
+  'mouseover': 'mouseOver',
+  'mouseup': 'mouseUp',
+  'mousewheel': 'mouseWheel',
+  'mute': 'mute',
+  'negotiationneeded': 'negotiationNeeded',
+  'nomatch': 'noMatch',
+  'noupdate': 'noUpdate',
+  'obsolete': 'obsolete',
+  'offline': 'offline',
+  'online': 'online',
+  'open': 'open',
+  'pagehide': 'pageHide',
+  'pageshow': 'pageShow',
+  'paste': 'paste',
+  'pause': 'pause',
+  'play': 'play',
+  'playing': 'playing',
+  'popstate': 'popState',
+  'progress': 'progress',
+  'ratechange': 'rateChange',
+  'readystatechange': 'readyStateChange',
+  'removestream': 'removeStream',
+  'removetrack': 'removeTrack',
+  'reset': 'reset',
+  'resize': 'resize',
+  'result': 'result',
+  'resultdeleted': 'resultDeleted',
+  'scroll': 'scroll',
+  'search': 'search',
+  'seeked': 'seeked',
+  'seeking': 'seeking',
+  'select': 'select',
+  'selectionchange': 'selectionChange',
+  'selectstart': 'selectStart',
+  'show': 'show',
+  'soundend': 'soundEnd',
+  'soundstart': 'soundStart',
+  'speechend': 'speechEnd',
+  'speechstart': 'speechStart',
+  'stalled': 'stalled',
+  'start': 'start',
+  'statechange': 'stateChange',
+  'storage': 'storage',
+  'submit': 'submit',
+  'success': 'success',
+  'suspend': 'suspend',
+  'timeupdate': 'timeUpdate',
+  'touchcancel': 'touchCancel',
+  'touchend': 'touchEnd',
+  'touchenter': 'touchEnter',
+  'touchleave': 'touchLeave',
+  'touchmove': 'touchMove',
+  'touchstart': 'touchStart',
+  'unload': 'unload',
+  'upgradeneeded': 'upgradeNeeded',
+  'unmute': 'unmute',
+  'updateready': 'updateReady',
+  'versionchange': 'versionChange',
+  'volumechange': 'volumeChange',
+  'waiting': 'waiting',
+  'webkitAnimationEnd': 'animationEnd',
+  'webkitAnimationIteration': 'animationIteration',
+  'webkitAnimationStart': 'animationStart',
+  'webkitfullscreenchange': 'fullscreenChange',
+  'webkitfullscreenerror': 'fullscreenError',
+  'webkitkeyadded': 'keyAdded',
+  'webkitkeyerror': 'keyError',
+  'webkitkeymessage': 'keyMessage',
+  'webkitneedkey': 'needKey',
+  'webkitpointerlockchange': 'pointerLockChange',
+  'webkitpointerlockerror': 'pointerLockError',
+  'webkitSpeechChange': 'speechChange',
+  'webkitsourceclose': 'sourceClose',
+  'webkitsourceended': 'sourceEnded',
+  'webkitsourceopen': 'sourceOpen',
+  'webkitTransitionEnd': 'transitionEnd',
+  'write': 'write',
+  'writeend': 'writeEnd',
+  'writestart': 'writeStart'
+}
+
+# These classes require an explicit declaration for the "on" method even though
+# they don't declare any unique events, because the concrete class hierarchy
+# doesn't match the interface hierarchy.
+_html_explicit_event_classes = set(['DocumentFragment'])
+
+class HtmlEventGenerator(object):
+
+  def __init__(self, database, template_loader):
+    self._event_classes = set()
+    self._database = database
+    self._template_loader = template_loader
+
+  def ProcessInterface(self, interface, html_interface_name, custom_events,
+                       events_interface_emitter, events_implementation_emitter):
+    events = set([attr for attr in interface.attributes
+                  if attr.type.id == 'EventListener'])
+    if not events and interface.id not in _html_explicit_event_classes:
+      return None
+
+    self._event_classes.add(interface.id)
+    events_interface = html_interface_name + 'Events'
+    parent_events_interface = self._GetParentEventsInterface(interface)
+
+    if not events:
+      return parent_events_interface
+
+    interface_events_members = events_interface_emitter.Emit(
+        '\nabstract class $INTERFACE implements $PARENT {\n$!MEMBERS}\n',
+        INTERFACE=events_interface,
+        PARENT=parent_events_interface)
+
+    template_file = 'impl_%s.darttemplate' % events_interface
+    template = (self._template_loader.TryLoad(template_file) or
+        '\n'
+        'class $CLASSNAME extends $SUPER implements $INTERFACE {\n'
+        '  $CLASSNAME(_ptr) : super(_ptr);\n'
+        '$!MEMBERS}\n')
+
+    # TODO(jacobr): specify the type of _ptr as EventTarget
+    implementation_events_members = events_implementation_emitter.Emit(
+        template,
+        CLASSNAME='_%sImpl' % events_interface,
+        INTERFACE=events_interface,
+        SUPER='_%sImpl' % parent_events_interface)
+
+    dom_event_names = set()
+    for event in events:
+      dom_name = event.id[2:]
+      dom_name = _on_attribute_to_event_name_mapping.get(dom_name, dom_name)
+      dom_event_names.add(dom_name)
+    if html_interface_name in _html_manual_events:
+      dom_event_names.update(_html_manual_events[html_interface_name])
+    dom_event_names = sorted(dom_event_names,
+                             key=lambda name: _html_event_names[name])
+    for dom_name in dom_event_names:
+      if dom_name not in _html_event_names:
+        raise Exception('No known html even name for event: ' + dom_name)
+      html_name = _html_event_names[dom_name]
+      interface_events_members.Emit('\n  EventListenerList get $NAME;\n',
+          NAME=html_name)
+      full_event_name = '%sEvents.%s' % (html_interface_name, html_name)
+      if not full_event_name in custom_events:
+        implementation_events_members.Emit(
+            "\n"
+            "  EventListenerList get $NAME => this['$DOM_NAME'];\n",
+            NAME=html_name,
+            DOM_NAME=dom_name)
+
+    return events_interface
+
+  # TODO(jacobr): this isn't quite right....
+  def _GetParentEventsInterface(self, interface):
+    # Ugly hack as we don't specify that Document and DocumentFragment inherit
+    # from Element in our IDL.
+    if interface.id == 'Document' or interface.id == 'DocumentFragment':
+      return 'ElementEvents'
+
+    parent_events_interface = 'Events'
+    interfaces_with_events = set()
+    for parent in self._database.Hierarchy(interface):
+      if parent != interface and parent.id in self._event_classes:
+        parent_events_interface = parent.id + 'Events'
+        interfaces_with_events.add(parent)
+    if len(interfaces_with_events) > 1:
+      raise Exception('Only one parent event class allowed ' + interface.id)
+    return parent_events_interface