content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.asterix.lexergenerator;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.FileReader;
  import java.io.IOException;
  import java.util.HashMap;
  
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  
  /**
   * @goal generate-lexer
   * @phase generate-sources
   * @requiresDependencyResolution compile
   */
  public class LexerGeneratorMojo extends AbstractMojo {
      /**
       * parameter injected from pom.xml
       *
       * @parameter
       * @required
       */
      private File grammarFile;
  
      /**
       * parameter injected from pom.xml
       *
       * @parameter
       * @required
       */
      private File outputDir;
  
      public void execute() throws MojoExecutionException {
          LexerGenerator lexer = new LexerGenerator(getLog());
          HashMap<String, String> config = new HashMap<String, String>();
          getLog().info("--- Lexer Generator Maven Plugin - started with grammarFile: " + grammarFile.toString());
          try {
              String input = readFile(grammarFile);
              config.put("OUTPUT_DIR", outputDir.toString());
              boolean tokens = false;
              for (String line : input.split("\r?\n")) {
                  line = line.trim();
                  if (line.length() == 0 || line.charAt(0) == '#')
                      continue;
                  if (tokens == false && !line.equals("TOKENS:")) {
                      config.put(line.split("\\s*:\\s*")[0], line.split("\\s*:\\s*")[1]);
                  } else if (line.equals("TOKENS:")) {
                      tokens = true;
                  } else {
                      lexer.addToken(line);
                  }
              }
              lexer.generateLexer(config);
          } catch (Throwable e) {
              throw new MojoExecutionException("Error while generating lexer", e);
          }
          String parsedGrammar = lexer.printParsedGrammar();
          getLog().info("--- Generated grammar:\n" + parsedGrammar);
      }
  
      private String readFile(File file) throws FileNotFoundException, IOException {
          StringBuffer fileData = new StringBuffer(1000);
          BufferedReader reader = new BufferedReader(new FileReader(file));
          char[] buf = new char[1024];
          int numRead = 0;
          while ((numRead = reader.read(buf)) != -1) {
              String readData = String.valueOf(buf, 0, numRead);
              fileData.append(readData);
              buf = new char[1024];
          }
          reader.close();
          return fileData.toString();
      }
  
  }
  