Tools/Java/Source/Cpptasks/net/sf/antcontrib/cpptasks/parser/AbstractParser.java

   1 /*
   2  *
   3  * Copyright 2001-2004 The Ant-Contrib project
   4  *
   5  *  Licensed under the Apache License, Version 2.0 (the "License");
   6  *  you may not use this file except in compliance with the License.
   7  *  You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  *  Unless required by applicable law or agreed to in writing, software
  12  *  distributed under the License is distributed on an "AS IS" BASIS,
  13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  *  See the License for the specific language governing permissions and
  15  *  limitations under the License.
  16  */
  17 package net.sf.antcontrib.cpptasks.parser;
  18 import java.io.IOException;
  19 import java.io.Reader;
  20 /**
  21  * An abstract base class for simple parsers
  22  *
  23  * @author Curt Arnold
  24  */
  25 public abstract class AbstractParser {
  26     /**
  27      *
  28      *
  29      */
  30     protected AbstractParser() {
  31     }
  32     protected abstract void addFilename(String filename);
  33     public abstract AbstractParserState getNewLineState();
  34     protected void parse(Reader reader) throws IOException {
  35         char[] buf = new char[4096];
  36         AbstractParserState newLineState = getNewLineState();
  37         AbstractParserState state = newLineState;
  38         int charsRead = -1;
  39         do {
  40             charsRead = reader.read(buf, 0, buf.length);
  41             if (state == null) {
  42                 for (int i = 0; i < charsRead; i++) {
  43                     if (buf[i] == '\n') {
  44                         state = newLineState;
  45                         break;
  46                     }
  47                 }
  48             }
  49             if (state != null) {
  50                 for (int i = 0; i < charsRead; i++) {
  51                     state = state.consume(buf[i]);
  52                     //
  53                     //  didn't match a production, skip to a new line
  54                     //
  55                     if (state == null) {
  56                         for (; i < charsRead; i++) {
  57                             if (buf[i] == '\n') {
  58                                 state = newLineState;
  59                                 break;
  60                             }
  61                         }
  62                     }
  63                 }
  64             }
  65         } while (charsRead >= 0);
  66     }
  67 }