src/examples/Mini/ASCII_CharStream.java - commons-bcel - Git at Google

 /*
  * 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.
  *
  */
 /* Generated By:JavaCC: Do not edit this line. ASCII_CharStream.java Version 0.7pre6 */
 package Mini;

 /**
  * An implementation of interface CharStream, where the stream is assumed to
  * contain only ASCII characters (without unicode processing).
  */

 public final class ASCII_CharStream
 {
   public static final boolean staticFlag = true;
   static int bufsize;
   static int available;
   static int tokenBegin;
   static public int bufpos = -1;
   static private int bufline[];
   static private int bufcolumn[];

   static private int column = 0;
   static private int line = 1;

   static private boolean prevCharIsCR = false;
   static private boolean prevCharIsLF = false;

   static private java.io.Reader inputStream;

   static private char[] buffer;
   static private int maxNextCharInd = 0;
   static private int inBuf = 0;

   static private void ExpandBuff(final boolean wrapAround)
   {
      final char[] newbuffer = new char[bufsize + 2048];
      final int newbufline[] = new int[bufsize + 2048];
      final 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;

            maxNextCharInd = (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;

            maxNextCharInd = (bufpos -= tokenBegin);
         }
      }
      catch (final Throwable t)
      {
         throw new Error(t.getMessage());
      }


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

   static private void FillBuff() throws java.io.IOException
   {
      if (maxNextCharInd == available)
      {
         if (available == bufsize)
         {
            if (tokenBegin > 2048)
            {
               bufpos = maxNextCharInd = 0;
               available = tokenBegin;
            }
            else if (tokenBegin < 0) {
             bufpos = maxNextCharInd = 0;
         } else {
             ExpandBuff(false);
         }
         }
         else if (available > tokenBegin) {
             available = bufsize;
         } else if ((tokenBegin - available) < 2048) {
             ExpandBuff(true);
         } else {
             available = tokenBegin;
         }
      }

      int i;
      try {
         if ((i = inputStream.read(buffer, maxNextCharInd,
                                     available - maxNextCharInd)) == -1)
         {
            inputStream.close();
            throw new java.io.IOException();
         }
         maxNextCharInd += i;
         return;
      }
      catch(final java.io.IOException e) {
         --bufpos;
         backup(0);
         if (tokenBegin == -1) {
             tokenBegin = bufpos;
         }
         throw e;
      }
   }

   static public char BeginToken() throws java.io.IOException
   {
      tokenBegin = -1;
      final char c = readChar();
      tokenBegin = bufpos;

      return c;
   }

   static private void UpdateLineColumn(final 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 += (8 - (column & 07));
            break;
         default :
            break;
      }

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

   static public char readChar() throws java.io.IOException
   {
      if (inBuf > 0)
      {
         --inBuf;
         return (char)((char)0xff & buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]);
      }

      if (++bufpos >= maxNextCharInd) {
         FillBuff();
     }

      final char c = (char)((char)0xff & buffer[bufpos]);

      UpdateLineColumn(c);
      return (c);
   }

   static public int getEndColumn() {
      return bufcolumn[bufpos];
   }

   static public int getEndLine() {
      return bufline[bufpos];
   }

   static public int getBeginColumn() {
      return bufcolumn[tokenBegin];
   }

   static public int getBeginLine() {
      return bufline[tokenBegin];
   }

   static public void backup(final int amount) {

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

   public ASCII_CharStream(final java.io.Reader dstream, final int startline,
   final int startcolumn, final int buffersize)
   {
     if (inputStream != null) {
         throw new Error("\n   ERROR: Second call to the constructor of a static ASCII_CharStream.  You must\n" +
            "       either use ReInit() or set the JavaCC option STATIC to false\n" +
            "       during the generation of this class.");
     }
     inputStream = dstream;
     line = startline;
     column = startcolumn - 1;

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

   public ASCII_CharStream(final java.io.Reader dstream, final int startline,
                                                            final int startcolumn)
   {
      this(dstream, startline, startcolumn, 4096);
   }
   static public void ReInit(final java.io.Reader dstream, final int startline,
   final int startcolumn, final 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];
     }
     prevCharIsLF = prevCharIsCR = false;
     tokenBegin = inBuf = maxNextCharInd = 0;
     bufpos = -1;
   }

   static public void ReInit(final java.io.Reader dstream, final int startline,
                                                            final int startcolumn)
   {
      ReInit(dstream, startline, startcolumn, 4096);
   }
   public ASCII_CharStream(final java.io.InputStream dstream, final int startline,
   final int startcolumn, final int buffersize)
   {
      this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
   }

   public ASCII_CharStream(final java.io.InputStream dstream, final int startline,
                                                            final int startcolumn)
   {
      this(dstream, startline, startcolumn, 4096);
   }

   static public void ReInit(final java.io.InputStream dstream, final int startline,
   final int startcolumn, final int buffersize)
   {
      ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
   }
   static public void ReInit(final java.io.InputStream dstream, final int startline,
                                                            final int startcolumn)
   {
      ReInit(dstream, startline, startcolumn, 4096);
   }
   static public String GetImage()
   {
      if (bufpos >= tokenBegin) {
         return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
     }
     return new String(buffer, tokenBegin, bufsize - tokenBegin) +
                           new String(buffer, 0, bufpos + 1);
   }

   static public char[] GetSuffix(final int len)
   {
      final 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;
   }

   static public void Done()
   {
      buffer = null;
      bufline = null;
      bufcolumn = null;
   }

   /**
    * Method to adjust line and column numbers for the start of a token.<BR>
    */
   static public void adjustBeginLineColumn(int newLine, final 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];
   }

 }
	/*
	* 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.
	*
	*/
	/* Generated By:JavaCC: Do not edit this line. ASCII_CharStream.java Version 0.7pre6 */
	package Mini;

	/**
	* An implementation of interface CharStream, where the stream is assumed to
	* contain only ASCII characters (without unicode processing).
	*/

	public final class ASCII_CharStream
	{
	public static final boolean staticFlag = true;
	static int bufsize;
	static int available;
	static int tokenBegin;
	static public int bufpos = -1;
	static private int bufline[];
	static private int bufcolumn[];

	static private int column = 0;
	static private int line = 1;

	static private boolean prevCharIsCR = false;
	static private boolean prevCharIsLF = false;

	static private java.io.Reader inputStream;

	static private char[] buffer;
	static private int maxNextCharInd = 0;
	static private int inBuf = 0;

	static private void ExpandBuff(final boolean wrapAround)
	{
	final char[] newbuffer = new char[bufsize + 2048];
	final int newbufline[] = new int[bufsize + 2048];
	final 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;

	maxNextCharInd = (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;

	maxNextCharInd = (bufpos -= tokenBegin);
	}
	}
	catch (final Throwable t)
	{
	throw new Error(t.getMessage());
	}


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

	static private void FillBuff() throws java.io.IOException
	{
	if (maxNextCharInd == available)
	{
	if (available == bufsize)
	{
	if (tokenBegin > 2048)
	{
	bufpos = maxNextCharInd = 0;
	available = tokenBegin;
	}
	else if (tokenBegin < 0) {
	bufpos = maxNextCharInd = 0;
	} else {
	ExpandBuff(false);
	}
	}
	else if (available > tokenBegin) {
	available = bufsize;
	} else if ((tokenBegin - available) < 2048) {
	ExpandBuff(true);
	} else {
	available = tokenBegin;
	}
	}

	int i;
	try {
	if ((i = inputStream.read(buffer, maxNextCharInd,
	available - maxNextCharInd)) == -1)
	{
	inputStream.close();
	throw new java.io.IOException();
	}
	maxNextCharInd += i;
	return;
	}
	catch(final java.io.IOException e) {
	--bufpos;
	backup(0);
	if (tokenBegin == -1) {
	tokenBegin = bufpos;
	}
	throw e;
	}
	}

	static public char BeginToken() throws java.io.IOException
	{
	tokenBegin = -1;
	final char c = readChar();
	tokenBegin = bufpos;

	return c;
	}

	static private void UpdateLineColumn(final 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 += (8 - (column & 07));
	break;
	default :
	break;
	}

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

	static public char readChar() throws java.io.IOException
	{
	if (inBuf > 0)
	{
	--inBuf;
	return (char)((char)0xff & buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]);
	}

	if (++bufpos >= maxNextCharInd) {
	FillBuff();
	}

	final char c = (char)((char)0xff & buffer[bufpos]);

	UpdateLineColumn(c);
	return (c);
	}

	static public int getEndColumn() {
	return bufcolumn[bufpos];
	}

	static public int getEndLine() {
	return bufline[bufpos];
	}

	static public int getBeginColumn() {
	return bufcolumn[tokenBegin];
	}

	static public int getBeginLine() {
	return bufline[tokenBegin];
	}

	static public void backup(final int amount) {

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

	public ASCII_CharStream(final java.io.Reader dstream, final int startline,
	final int startcolumn, final int buffersize)
	{
	if (inputStream != null) {
	throw new Error("\n ERROR: Second call to the constructor of a static ASCII_CharStream. You must\n" +
	" either use ReInit() or set the JavaCC option STATIC to false\n" +
	" during the generation of this class.");
	}
	inputStream = dstream;
	line = startline;
	column = startcolumn - 1;

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

	public ASCII_CharStream(final java.io.Reader dstream, final int startline,
	final int startcolumn)
	{
	this(dstream, startline, startcolumn, 4096);
	}
	static public void ReInit(final java.io.Reader dstream, final int startline,
	final int startcolumn, final 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];
	}
	prevCharIsLF = prevCharIsCR = false;
	tokenBegin = inBuf = maxNextCharInd = 0;
	bufpos = -1;
	}

	static public void ReInit(final java.io.Reader dstream, final int startline,
	final int startcolumn)
	{
	ReInit(dstream, startline, startcolumn, 4096);
	}
	public ASCII_CharStream(final java.io.InputStream dstream, final int startline,
	final int startcolumn, final int buffersize)
	{
	this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
	}

	public ASCII_CharStream(final java.io.InputStream dstream, final int startline,
	final int startcolumn)
	{
	this(dstream, startline, startcolumn, 4096);
	}

	static public void ReInit(final java.io.InputStream dstream, final int startline,
	final int startcolumn, final int buffersize)
	{
	ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
	}
	static public void ReInit(final java.io.InputStream dstream, final int startline,
	final int startcolumn)
	{
	ReInit(dstream, startline, startcolumn, 4096);
	}
	static public String GetImage()
	{
	if (bufpos >= tokenBegin) {
	return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
	}
	return new String(buffer, tokenBegin, bufsize - tokenBegin) +
	new String(buffer, 0, bufpos + 1);
	}

	static public char[] GetSuffix(final int len)
	{
	final 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;
	}

	static public void Done()
	{
	buffer = null;
	bufline = null;
	bufcolumn = null;
	}

	/**
	* Method to adjust line and column numbers for the start of a token.<BR>
	*/
	static public void adjustBeginLineColumn(int newLine, final 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];
	}

	}