/*
    * Copyright 2005,2009 Ivan SZKIBA
    *
    * 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 org.ini4j.spi;
  
  import org.ini4j.Config;
  import org.ini4j.InvalidFileFormatException;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.Reader;
  
  import java.net.URL;
  
  import java.util.Locale;
  
  public class IniParser extends AbstractParser
  {
      private static final String COMMENTS = ";#";
      private static final String OPERATORS = ":=";
      static final char SECTION_BEGIN = '[';
      static final char SECTION_END = ']';
  
      public IniParser()
      {
          super(OPERATORS, COMMENTS);
      }
  
      public static IniParser newInstance()
      {
          return ServiceFinder.findService(IniParser.class);
      }
  
      public static IniParser newInstance(Config config)
      {
          IniParser instance = newInstance();
  
          instance.setConfig(config);
  
          return instance;
      }
  
      public void parse(InputStream input, IniHandler handler) throws IOException, InvalidFileFormatException
      {
          parse(newIniSource(input, handler), handler);
      }
  
      public void parse(Reader input, IniHandler handler) throws IOException, InvalidFileFormatException
      {
          parse(newIniSource(input, handler), handler);
      }
  
      public void parse(URL input, IniHandler handler) throws IOException, InvalidFileFormatException
      {
          parse(newIniSource(input, handler), handler);
      }
  
      private void parse(IniSource source, IniHandler handler) throws IOException, InvalidFileFormatException
      {
          handler.startIni();
          String sectionName = null;
  
          for (String line = source.readLine(); line != null; line = source.readLine())
          {
              if (line.charAt(0) == SECTION_BEGIN)
              {
                  if (sectionName != null)
                  {
                      handler.endSection();
                  }
  
                  sectionName = parseSectionLine(line, source, handler);
              }
              else
              {
                  if (sectionName == null)
                  {
                      if (getConfig().isGlobalSection())
                      {
                          sectionName = getConfig().getGlobalSectionName();
                          handler.startSection(sectionName);
                      }
                      else
                      {
                          parseError(line, source.getLineNumber());
                      }
                  }
 
                 parseOptionLine(line, handler, source.getLineNumber());
             }
         }
 
         if (sectionName != null)
         {
             handler.endSection();
         }
 
         handler.endIni();
     }
 
     private String parseSectionLine(String line, IniSource source, IniHandler handler) throws InvalidFileFormatException
     {
         String sectionName;
 
         if (line.charAt(line.length() - 1) != SECTION_END)
         {
             parseError(line, source.getLineNumber());
         }
 
         sectionName = unescapeFilter(line.substring(1, line.length() - 1).trim());
         if ((sectionName.length() == 0) && !getConfig().isUnnamedSection())
         {
             parseError(line, source.getLineNumber());
         }
 
         if (getConfig().isLowerCaseSection())
         {
             sectionName = sectionName.toLowerCase(Locale.getDefault());
         }
 
         handler.startSection(sectionName);
 
         return sectionName;
     }
 }