AbstractParser.java

/*
 * #%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;

/**
 * An abstract base class for simple parsers
 *
 * @author Curt Arnold
 */
public abstract class AbstractParser {
  /**
     *
     *
     */
  protected AbstractParser() {
  }

  protected abstract void addFilename(String filename);

  public abstract AbstractParserState getNewLineState();

  protected void parse(final Reader reader) throws IOException {
    final char[] buf = new char[4096];
    final AbstractParserState newLineState = getNewLineState();
    AbstractParserState state = newLineState;
    int charsRead = -1;
    do {
      charsRead = reader.read(buf, 0, buf.length);
      if (state == null) {
        for (int i = 0; i < charsRead; i++) {
          if (buf[i] == '\n') {
            state = newLineState;
            break;
          }
        }
      }
      if (state != null) {
        for (int i = 0; i < charsRead; i++) {
          state = state.consume(buf[i]);
          //
          // didn't match a production, skip to a new line
          //
          if (state == null) {
            for (; i < charsRead; i++) {
              if (buf[i] == '\n') {
                state = newLineState;
                break;
              }
            }
          }
        }
      }
    } while (charsRead >= 0);
  }
}