| /* |
| * Copyright 2008 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.uibinder.elementparsers; |
| |
| import com.google.gwt.core.ext.UnableToCompleteException; |
| import com.google.gwt.uibinder.rebind.UiBinderWriter; |
| import com.google.gwt.uibinder.rebind.XMLElement; |
| import com.google.gwt.uibinder.rebind.messages.MessageWriter; |
| import com.google.gwt.uibinder.rebind.messages.MessagesWriter; |
| import com.google.gwt.uibinder.rebind.messages.PlaceholderInterpreter; |
| |
| /** |
| * Processes <ui:msg> elements inside HTML values, which themselves |
| * are allowed to contain HTML. That HTML may hold elements with |
| * ui:field attributes and computed attributes, which must be |
| * replaced by placeholders in the generated message. |
| */ |
| public class HtmlMessageInterpreter implements XMLElement.Interpreter<String> { |
| /** |
| * Provides instances of {@link PlaceholderInterpreter}, to allow |
| * customized handling of the innards of a msg element. |
| */ |
| public interface PlaceholderInterpreterProvider { |
| PlaceholderInterpreter get(MessageWriter message); |
| } |
| |
| private final UiBinderWriter uiWriter; |
| private final PlaceholderInterpreterProvider phiProvider; |
| |
| /** |
| * Build a HtmlMessageInterpreter that uses customized placeholder interpreter |
| * instances. |
| */ |
| public HtmlMessageInterpreter(UiBinderWriter uiWriter, |
| PlaceholderInterpreterProvider phiProvider) { |
| this.uiWriter = uiWriter; |
| this.phiProvider = phiProvider; |
| } |
| |
| /** |
| * Build a normally configured HtmlMessageInterpreter, able to handle |
| * put placeholders around dom elements with ui:ph attributes and computed |
| * attributes. |
| */ |
| public HtmlMessageInterpreter(final UiBinderWriter uiWriter, |
| final String ancestorExpression) { |
| this(uiWriter, new PlaceholderInterpreterProvider() { |
| public PlaceholderInterpreter get(MessageWriter message) { |
| return new HtmlPlaceholderInterpreter(uiWriter, message, ancestorExpression); |
| } |
| }); |
| } |
| |
| public String interpretElement(XMLElement elem) |
| throws UnableToCompleteException { |
| MessagesWriter messages = uiWriter.getMessages(); |
| if (messages.isMessage(elem)) { |
| if (!elem.hasChildNodes()) { |
| uiWriter.die(elem, "Empty message"); |
| } |
| |
| MessageWriter message = messages.newMessage(elem); |
| message.setDefaultMessage(elem.consumeInnerHtml(phiProvider.get(message))); |
| return uiWriter.tokenForSafeConstant(elem, messages.declareMessage(message)); |
| } |
| |
| return null; |
| } |
| } |