owlapi-version5/parsers/src/main/java/org/semanticweb/owlapi/dlsyntax/parser/JavaCharStream.java
/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 7.0 */
/* JavaCCOptions:STATIC=false,SUPPORT_CLASS_VISIBILITY_PUBLIC=false */
/* This file is part of the OWL API.
 * The contents of this file are subject to the LGPL License, Version 3.0.
 * Copyright 2014, The University of Manchester
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 * Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0 in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
 * 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.semanticweb.owlapi.dlsyntax.parser;

/**
 * An implementation of interface CharStream, where the stream is assumed to
 * contain only ASCII characters (with java-like unicode escape processing).
 */
@SuppressWarnings("all")
 class JavaCharStream
{
  /** Whether parser is static. */
  public static final boolean staticFlag = false;


  static final int hexval(char c) throws java.io.IOException {
    switch(c)
    {
       case '0' :
          return 0;
       case '1' :
          return 1;
       case '2' :
          return 2;
       case '3' :
          return 3;
       case '4' :
          return 4;
       case '5' :
          return 5;
       case '6' :
          return 6;
       case '7' :
          return 7;
       case '8' :
          return 8;
       case '9' :
          return 9;

       case 'a' :
       case 'A' :
          return 10;
       case 'b' :
       case 'B' :
          return 11;
       case 'c' :
       case 'C' :
          return 12;
       case 'd' :
       case 'D' :
          return 13;
       case 'e' :
       case 'E' :
          return 14;
       case 'f' :
       case 'F' :
          return 15;
    }

    throw new java.io.IOException(); // Should never come here
  }

/** Position in buffer. */
  public int bufpos = -1;
  int bufsize;
  int available;
  int tokenBegin;
  protected int bufline[];
  protected int bufcolumn[];

  protected int column = 0;
  protected int line = 1;

  protected boolean prevCharIsCR = false;
  protected boolean prevCharIsLF = false;

  protected Provider inputStream;

  protected char[] nextCharBuf;
  protected char[] buffer;
  protected int maxNextCharInd = 0;
  protected int nextCharInd = -1;
  protected int inBuf = 0;
  protected int tabSize = 1;
  protected boolean trackLineColumn = true;

  public void setTabSize(int i) { tabSize = i; }
  public int getTabSize(int i) { return tabSize; }

  protected void ExpandBuff(boolean wrapAround)
  {
    char[] newbuffer = new char[bufsize + 2048];
    int newbufline[] = new int[bufsize + 2048];
    int newbufcolumn[] = new int[bufsize + 2048];

    try
    {
      if (wrapAround)
      {
        System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
        System.arraycopy(buffer, 0, newbuffer, bufsize - tokenBegin, bufpos);
        buffer = newbuffer;

        System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
        System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
        bufline = newbufline;

        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
        System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
        bufcolumn = newbufcolumn;

        bufpos += (bufsize - tokenBegin);
    }
    else
    {
        System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
        buffer = newbuffer;

        System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
        bufline = newbufline;

        System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
        bufcolumn = newbufcolumn;

        bufpos -= tokenBegin;
      }
    }
    catch (Exception t)
    {
      throw new RuntimeException(t.getMessage());
    }

    available = (bufsize += 2048);
    tokenBegin = 0;
  }

  protected void FillBuff() throws java.io.IOException
  {
    int i;
    if (maxNextCharInd == 4096)
      maxNextCharInd = nextCharInd = 0;

    try {
      if ((i = inputStream.read(nextCharBuf, maxNextCharInd,
                                          4096 - maxNextCharInd)) == -1)
      {
        inputStream.close();
        throw new java.io.IOException();
      }
      else
         maxNextCharInd += i;
      return;
    }
    catch(java.io.IOException e) {
      if (bufpos != 0)
      {
        --bufpos;
        backup(0);
      }
      else
      {
        bufline[bufpos] = line;
        bufcolumn[bufpos] = column;
      }
      throw e;
    }
  }

  protected char ReadByte() throws java.io.IOException
  {
    if (++nextCharInd >= maxNextCharInd)
      FillBuff();

    return nextCharBuf[nextCharInd];
  }

/** @return starting character for token. */
  public char BeginToken() throws java.io.IOException
  {
    if (inBuf > 0)
    {
      --inBuf;

      if (++bufpos == bufsize)
        bufpos = 0;

      tokenBegin = bufpos;
      return buffer[bufpos];
    }

    tokenBegin = 0;
    bufpos = -1;

    return readChar();
  }

  protected void AdjustBuffSize()
  {
    if (available == bufsize)
    {
      if (tokenBegin > 2048)
      {
        bufpos = 0;
        available = tokenBegin;
      }
      else
        ExpandBuff(false);
    }
    else if (available > tokenBegin)
      available = bufsize;
    else if ((tokenBegin - available) < 2048)
      ExpandBuff(true);
    else
      available = tokenBegin;
  }

  protected void UpdateLineColumn(char c)
  {
    column++;

    if (prevCharIsLF)
    {
      prevCharIsLF = false;
      line += (column = 1);
    }
    else if (prevCharIsCR)
    {
      prevCharIsCR = false;
      if (c == '\n')
      {
        prevCharIsLF = true;
      }
      else
        line += (column = 1);
    }

    switch (c)
    {
      case '\r' :
        prevCharIsCR = true;
        break;
      case '\n' :
        prevCharIsLF = true;
        break;
      case '\t' :
        column--;
        column += (tabSize - (column % tabSize));
        break;
      default :
        break;
    }

    bufline[bufpos] = line;
    bufcolumn[bufpos] = column;
  }

/** Read a character. */
  public char readChar() throws java.io.IOException
  {
    if (inBuf > 0)
    {
      --inBuf;

      if (++bufpos == bufsize)
        bufpos = 0;

      return buffer[bufpos];
    }

    char c;

    if (++bufpos == available)
      AdjustBuffSize();

    if ((buffer[bufpos] = c = ReadByte()) == '\\')
    {
      UpdateLineColumn(c);

      int backSlashCnt = 1;

      for (;;) // Read all the backslashes
      {
        if (++bufpos == available)
          AdjustBuffSize();

        try
        {
          if ((buffer[bufpos] = c = ReadByte()) != '\\')
          {
            UpdateLineColumn(c);
            // found a non-backslash char.
            if ((c == 'u') && ((backSlashCnt & 1) == 1))
            {
              if (--bufpos < 0)
                bufpos = bufsize - 1;

              break;
            }

            backup(backSlashCnt);
            return '\\';
          }
        }
        catch(java.io.IOException e)
        {
	  // We are returning one backslash so we should only backup (count-1)
          if (backSlashCnt > 1)
            backup(backSlashCnt-1);

          return '\\';
        }

        UpdateLineColumn(c);
        backSlashCnt++;
      }

      // Here, we have seen an odd number of backslash's followed by a 'u'
      try
      {
        while ((c = ReadByte()) == 'u')
          ++column;

        buffer[bufpos] = c = (char)(hexval(c) << 12 |
                                    hexval(ReadByte()) << 8 |
                                    hexval(ReadByte()) << 4 |
                                    hexval(ReadByte()));

        column += 4;
      }
      catch(java.io.IOException e)
      {
        throw new RuntimeException("Invalid escape character at line " + line +
                                         " column " + column + ".");
      }

      if (backSlashCnt == 1)
        return c;
      else
      {
        backup(backSlashCnt - 1);
        return '\\';
      }
    }
    else
    {
      UpdateLineColumn(c);
      return c;
    }
  }

  @Deprecated
  /**
   * @deprecated
   * @see #getEndColumn
   */
  public int getColumn() {
    return bufcolumn[bufpos];
  }

  @Deprecated
  /**
   * @deprecated
   * @see #getEndLine
   */
  public int getLine() {
    return bufline[bufpos];
  }

/** Get end column. */
  public int getEndColumn() {
    return bufcolumn[bufpos];
  }

/** Get end line. */
  public int getEndLine() {
    return bufline[bufpos];
  }

/** @return column of token start */
  public int getBeginColumn() {
    return bufcolumn[tokenBegin];
  }

/** @return line number of token start */
  public int getBeginLine() {
    return bufline[tokenBegin];
  }

/** Retreat. */
  public void backup(int amount) {

    inBuf += amount;
    if ((bufpos -= amount) < 0)
      bufpos += bufsize;
  }

/** Constructor. */
  public JavaCharStream(Provider dstream,
                 int startline, int startcolumn, int buffersize)
  {
    inputStream = dstream;
    line = startline;
    column = startcolumn - 1;

    available = bufsize = buffersize;
    buffer = new char[buffersize];
    bufline = new int[buffersize];
    bufcolumn = new int[buffersize];
    nextCharBuf = new char[4096];
  }

/** Constructor. */
  public JavaCharStream(Provider dstream,
                                        int startline, int startcolumn)
  {
    this(dstream, startline, startcolumn, 4096);
  }

/** Constructor. */
  public JavaCharStream(Provider dstream)
  {
    this(dstream, 1, 1, 4096);
  }
/** Reinitialise. */
  public void ReInit(Provider dstream,
                 int startline, int startcolumn, int buffersize)
  {
    inputStream = dstream;
    line = startline;
    column = startcolumn - 1;

    if (buffer == null || buffersize != buffer.length)
    {
      available = bufsize = buffersize;
      buffer = new char[buffersize];
      bufline = new int[buffersize];
      bufcolumn = new int[buffersize];
      nextCharBuf = new char[4096];
    }
    prevCharIsLF = prevCharIsCR = false;
    tokenBegin = inBuf = maxNextCharInd = 0;
    nextCharInd = bufpos = -1;
  }

/** Reinitialise. */
  public void ReInit(Provider dstream,
                                        int startline, int startcolumn)
  {
    ReInit(dstream, startline, startcolumn, 4096);
  }

/** Reinitialise. */
  public void ReInit(Provider dstream)
  {
    ReInit(dstream, 1, 1, 4096);
  }



  /** @return token image as String */
  public String GetImage()
  {
    if (bufpos >= tokenBegin)
      return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
    else
      return new String(buffer, tokenBegin, bufsize - tokenBegin) +
                              new String(buffer, 0, bufpos + 1);
  }

  /** @return suffix */
  public char[] GetSuffix(int len)
  {
    char[] ret = new char[len];

    if ((bufpos + 1) >= len)
      System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
    else
    {
      System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0,
                                                        len - bufpos - 1);
      System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
    }

    return ret;
  }

  /** Set buffers back to null when finished. */
  public void Done()
  {
    nextCharBuf = null;
    buffer = null;
    bufline = null;
    bufcolumn = null;
  }

  /**
   * Method to adjust line and column numbers for the start of a token.
   */
  public void adjustBeginLineColumn(int newLine, int newCol)
  {
    int start = tokenBegin;
    int len;

    if (bufpos >= tokenBegin)
    {
      len = bufpos - tokenBegin + inBuf + 1;
    }
    else
    {
      len = bufsize - tokenBegin + bufpos + 1 + inBuf;
    }

    int i = 0, j = 0, k = 0;
    int nextColDiff = 0, columnDiff = 0;

    while (i < len && bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
    {
      bufline[j] = newLine;
      nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
      bufcolumn[j] = newCol + columnDiff;
      columnDiff = nextColDiff;
      i++;
    }

    if (i < len)
    {
      bufline[j] = newLine++;
      bufcolumn[j] = newCol + columnDiff;

      while (i++ < len)
      {
        if (bufline[j = start % bufsize] != bufline[++start % bufsize])
          bufline[j] = newLine++;
        else
          bufline[j] = newLine;
      }
    }

    line = bufline[j];
    column = bufcolumn[j];
  }
  boolean getTrackLineColumn() { return trackLineColumn; }
  void setTrackLineColumn(boolean tlc) { trackLineColumn = tlc; }

}
/* JavaCC - OriginalChecksum=b092b8384064d6b335968cb2030f6339 (do not edit this line) */
