com.google.gwt.core.linker.IFrameLinker Maven / Gradle / Ivy

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/*
 * 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.core.linker;

import com.google.gwt.core.ext.LinkerContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.linker.LinkerOrder;
import com.google.gwt.core.ext.linker.LinkerOrder.Order;
import com.google.gwt.core.ext.linker.Shardable;
import com.google.gwt.core.ext.linker.impl.SelectionScriptLinker;
import com.google.gwt.dev.About;
import com.google.gwt.dev.util.DefaultTextOutput;

/**
 * Implements the canonical GWT bootstrap sequence that loads the GWT module in
 * a separate iframe.
 */
@LinkerOrder(Order.PRIMARY)
@Shardable
public class IFrameLinker extends SelectionScriptLinker {
  /**
   * This string is inserted between script chunks. It is made default access
   * for testing.
   */
  static final String SCRIPT_CHUNK_SEPARATOR = "-->\n");
    out.newlineOpt();

    return out.toString();
  }

  @Override
  protected String getScriptChunkSeparator(TreeLogger logger, LinkerContext context) {
    return SCRIPT_CHUNK_SEPARATOR;
  }

  @Override
  protected String getSelectionScriptTemplate(TreeLogger logger, LinkerContext context) {
    return "com/google/gwt/core/linker/IFrameTemplate.js";
  }

  protected String modifyPrimaryJavaScript(String js) {
    return js;
  }

  /**
   * This is the real implementation of getModulePrefix for this
   * linker. The other versions forward to this one.
   */
  private String getModulePrefix(TreeLogger logger, LinkerContext context,
      String strongName, boolean supportRunAsync)
      throws UnableToCompleteException {
    DefaultTextOutput out = new DefaultTextOutput(context.isOutputCompact());
    out.print("");
    out.newlineOpt();

    // Setup the well-known variables.
    out.print("");
    out.newlineOpt();
    out.print("");
    out.newlineOpt();

    // Begin a script block inside the body. It's commented out so that the
    // browser won't mistake strings containing "