/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 4.1 */

/* JavaCCOptions:STATIC=false,SUPPORT_CLASS_VISIBILITY_PUBLIC=true */

/*

 * (c) Copyright 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP

 * All rights reserved.

 */



package com.hp.hpl.jena.n3.turtle.parser ;



/**

 * An implementation of interface CharStream, where the stream is assumed to

 * contain only ASCII characters (with java-like unicode escape processing).

 */



public

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 java.io.Reader inputStream;



  protected char[] nextCharBuf;

  protected char[] buffer;

  protected int maxNextCharInd = 0;

  protected int nextCharInd = -1;

  protected int inBuf = 0;

  protected int tabSize = 8;



  protected void setTabSize(int i) { tabSize = i; }

  protected 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 (Throwable t)

    {

      throw new Error(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 Error("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(java.io.Reader 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(java.io.Reader dstream,

                                        int startline, int startcolumn)

  {

    this(dstream, startline, startcolumn, 4096);

  }



/** Constructor. */

  public JavaCharStream(java.io.Reader dstream)

  {

    this(dstream, 1, 1, 4096);

  }

/** Reinitialise. */

  public void ReInit(java.io.Reader 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(java.io.Reader dstream,

                                        int startline, int startcolumn)

  {

    ReInit(dstream, startline, startcolumn, 4096);

  }



/** Reinitialise. */

  public void ReInit(java.io.Reader dstream)

  {

    ReInit(dstream, 1, 1, 4096);

  }

/** Constructor. */

  public JavaCharStream(java.io.InputStream dstream, String encoding, int startline,

  int startcolumn, int buffersize) throws java.io.UnsupportedEncodingException

  {

    this(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);

  }



/** Constructor. */

  public JavaCharStream(java.io.InputStream dstream, int startline,

  int startcolumn, int buffersize)

  {

    this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);

  }



/** Constructor. */

  public JavaCharStream(java.io.InputStream dstream, String encoding, int startline,

                        int startcolumn) throws java.io.UnsupportedEncodingException

  {

    this(dstream, encoding, startline, startcolumn, 4096);

  }



/** Constructor. */

  public JavaCharStream(java.io.InputStream dstream, int startline,

                        int startcolumn)

  {

    this(dstream, startline, startcolumn, 4096);

  }



/** Constructor. */

  public JavaCharStream(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException

  {

    this(dstream, encoding, 1, 1, 4096);

  }



/** Constructor. */

  public JavaCharStream(java.io.InputStream dstream)

  {

    this(dstream, 1, 1, 4096);

  }



/** Reinitialise. */

  public void ReInit(java.io.InputStream dstream, String encoding, int startline,

  int startcolumn, int buffersize) throws java.io.UnsupportedEncodingException

  {

    ReInit(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);

  }



/** Reinitialise. */

  public void ReInit(java.io.InputStream dstream, int startline,

  int startcolumn, int buffersize)

  {

    ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);

  }

/** Reinitialise. */

  public void ReInit(java.io.InputStream dstream, String encoding, int startline,

                     int startcolumn) throws java.io.UnsupportedEncodingException

  {

    ReInit(dstream, encoding, startline, startcolumn, 4096);

  }

/** Reinitialise. */

  public void ReInit(java.io.InputStream dstream, int startline,

                     int startcolumn)

  {

    ReInit(dstream, startline, startcolumn, 4096);

  }

/** Reinitialise. */

  public void ReInit(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException

  {

    ReInit(dstream, encoding, 1, 1, 4096);

  }



/** Reinitialise. */

  public void ReInit(java.io.InputStream 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];

  }



}

/* JavaCC - OriginalChecksum=81c1b5b538b6704514625f89e10b012e (do not edit this line) */