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/*
 * 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.gwt.safehtml.rebind;

import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dev.util.Preconditions;
import com.google.gwt.safehtml.rebind.ParsedHtmlTemplate.HtmlContext;
import com.google.gwt.safehtml.rebind.ParsedHtmlTemplate.ParameterChunk;
import com.google.gwt.thirdparty.streamhtmlparser.HtmlParser;
import com.google.gwt.thirdparty.streamhtmlparser.HtmlParserFactory;
import com.google.gwt.thirdparty.streamhtmlparser.ParseException;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * A HTML context-aware parser for a simple HTML template language.
 *
 * 

 * This parser parses templates consisting of HTML markup, with template
 * variables of the form {@code {n}}. For example, a template might look like,
 *
 * 
  {@code
 *   {3}
 * }

 *
 * 

 * The parser is lenient, and will accept HTML that is not well-formed; the
 * accepted set of HTML is similar to what is typically accepted by browsers.
 * However, the following constraints on the HTML template are enforced:
 *
 * 
    
 * 
  1. Template variables may not appear in a JavaScript context (inside a
 * {@code