/*
    * #%L
    * Native ARchive plugin for Maven
    * %%
    * Copyright (C) 2002 - 2014 NAR Maven Plugin developers.
    * %%
    * 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.
   * #L%
   */
  package com.github.maven_nar.cpptasks.parser;
  
  import java.io.IOException;
  import java.io.Reader;
  import java.util.Vector;
  
  /**
   * A parser that extracts #include statements from a Reader.
   *
   * @author Adam Murdoch
   * @author Curt Arnold
   */
  public final class CParser extends AbstractParser implements Parser {
    private final Vector<String> includes = new Vector<>();
    private final AbstractParserState newLineState;
  
    /**
       *
       *
       */
    public CParser() {
      final AbstractParserState quote = new FilenameState(this, new char[] {
        '"'
      });
      final AbstractParserState bracket = new FilenameState(this, new char[] {
        '>'
      });
      final AbstractParserState postE = new PostE(this, bracket, quote);
      //
      // nclude
      //
      final AbstractParserState e = new LetterState(this, 'e', postE, null);
      final AbstractParserState d = new LetterState(this, 'd', e, null);
      final AbstractParserState u = new LetterState(this, 'u', d, null);
      final AbstractParserState l = new LetterState(this, 'l', u, null);
      final AbstractParserState c = new LetterState(this, 'c', l, null);
      final AbstractParserState n = new LetterState(this, 'n', c, null);
      //
      // mport is equivalent to nclude
      //
      final AbstractParserState t = new LetterState(this, 't', postE, null);
      final AbstractParserState r = new LetterState(this, 'r', t, null);
      final AbstractParserState o = new LetterState(this, 'o', r, null);
      final AbstractParserState p = new LetterState(this, 'p', o, null);
      final AbstractParserState m = new LetterState(this, 'm', p, null);
      //
      // switch between
      //
      final AbstractParserState n_m = new BranchState(this, new char[] {
          'n', 'm'
      }, new AbstractParserState[] {
          n, m
      }, null);
      final AbstractParserState i = new WhitespaceOrLetterState(this, 'i', n_m);
      this.newLineState = new WhitespaceOrLetterState(this, '#', i);
    }
  
    @Override
    public void addFilename(final String include) {
      this.includes.addElement(include);
    }
  
    @Override
    public String[] getIncludes() {
      final String[] retval = new String[this.includes.size()];
      this.includes.copyInto(retval);
      return retval;
    }
  
    @Override
    public AbstractParserState getNewLineState() {
      return this.newLineState;
    }
  
    @Override
    public void parse(final Reader reader) throws IOException {
      this.includes.setSize(0);
      super.parse(reader);
    }
  }