/*
 * Copyright 2009 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.jstestdriver.html;

import com.google.jstestdriver.html.HtmlDocParser.NodeFactory;
import com.google.jstestdriver.token.BufferedTokenStream;
import com.google.jstestdriver.token.ConcreteToken;
import com.google.jstestdriver.token.Nodes;
import com.google.jstestdriver.token.Token;

/**
 * Creates TextNodes from a TokenStream.
 * @author corysmith@google.com (Cory Smith)
 *
 */
public class BlockNodeFactory implements NodeFactory {
  private static final ConcreteToken BLOCK_START_TOKEN = new ConcreteToken("{".toCharArray());
  private static final ConcreteToken BLOCK_END_TOKEN = new ConcreteToken("}".toCharArray());
  private final NodeFactory[] factories;


  public BlockNodeFactory(NodeFactory[] factories) {
    this.factories = factories;
  }

  public void create(BufferedTokenStream stream, Nodes nodes) {
    if (!BLOCK_START_TOKEN.equals(stream.read())) {
      stream.reset();
      return;
    }
    nodes.add(new TextNode(BLOCK_START_TOKEN));
    stream.mark();
    while(stream.available()) {
      Token token = stream.read();
      if (BLOCK_END_TOKEN.equals(token)) {
        stream.mark();
        nodes.add(new TextNode(BLOCK_END_TOKEN));
        return;
      }
      if (BLOCK_START_TOKEN.equals(token)) {
        stream.reset();
        create(stream, nodes);
        return;
      }
      stream.reset();
      for (NodeFactory factory : factories) {
        factory.create(stream, nodes);
      }
    }
  }
}