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ASCII_UCodeESC_CharStream.javaAPI DocGlassfish v2 API14712Sat May 05 19:17:16 BST 2007org.apache.taglibs.standard.extra.spath

ASCII_UCodeESC_CharStream

public final class ASCII_UCodeESC_CharStream extends Object
An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (with java-like unicode escape processing).

Fields Summary
public static final boolean
staticFlag
public int
bufpos
int
bufsize
int
available
int
tokenBegin
private int[]
bufline
private int[]
bufcolumn
private int
column
private int
line
private Reader
inputStream
private boolean
prevCharIsCR
private boolean
prevCharIsLF
private char[]
nextCharBuf
private char[]
buffer
private int
maxNextCharInd
private int
nextCharInd
private int
inBuf
Constructors Summary
public ASCII_UCodeESC_CharStream(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];
public ASCII_UCodeESC_CharStream(Reader dstream, int startline, int startcolumn)

     this(dstream, startline, startcolumn, 4096);
public ASCII_UCodeESC_CharStream(InputStream dstream, int startline, int startcolumn, int buffersize)

     this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
public ASCII_UCodeESC_CharStream(InputStream dstream, int startline, int startcolumn)

     this(dstream, startline, startcolumn, 4096);
Methods Summary
private final voidAdjustBuffSize()

     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;
public final charBeginToken()

     
     if (inBuf > 0)
     {
        --inBuf;
        return buffer[tokenBegin = (bufpos == bufsize - 1) ? (bufpos = 0)
                                                           : ++bufpos];
     }

     tokenBegin = 0;
     bufpos = -1;

     return readChar();
public voidDone()

     nextCharBuf = null;
     buffer = null;
     bufline = null;
     bufcolumn = null;
private final voidExpandBuff(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;
private final voidFillBuff()

     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;
     }
public final java.lang.StringGetImage()

     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);
public final 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;
public voidReInit(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;
public voidReInit(java.io.Reader dstream, int startline, int startcolumn)

     ReInit(dstream, startline, startcolumn, 4096);
public voidReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)

     ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
public voidReInit(java.io.InputStream dstream, int startline, int startcolumn)

     ReInit(dstream, startline, startcolumn, 4096);
private final charReadByte()

     if (++nextCharInd >= maxNextCharInd)
        FillBuff();

     return nextCharBuf[nextCharInd];
private final voidUpdateLineColumn(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;
public voidadjustBeginLineColumn(int newLine, int newCol)
Method to adjust line and column numbers for the start of a token.

     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];
public final voidbackup(int amount)


    inBuf += amount;
    if ((bufpos -= amount) < 0)
       bufpos += bufsize;
public final intgetBeginColumn()

     return bufcolumn[tokenBegin];
public final intgetBeginLine()

     return bufline[tokenBegin];
public final intgetColumn()

deprecated
see
#getEndColumn

     return bufcolumn[bufpos];
public final intgetEndColumn()

     return bufcolumn[bufpos];
public final intgetEndLine()

     return bufline[bufpos];
public final intgetLine()

deprecated
see
#getEndLine

     return bufline[bufpos];
static final inthexval(char c)

         
    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
public final charreadChar()

     if (inBuf > 0)
     {
        --inBuf;
        return buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos];
     }

     char c;

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

     if (((buffer[bufpos] = c = (char)((char)0xff & ReadByte())) == '\\"))
     {
        UpdateLineColumn(c);

        int backSlashCnt = 1;

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

           try
           {
              if ((buffer[bufpos] = c = (char)((char)0xff & 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)
           {
              if (backSlashCnt > 1)
                 backup(backSlashCnt);

              return '\\";
           }

           UpdateLineColumn(c);
           backSlashCnt++;
        }

        // Here, we have seen an odd number of backslash's followed by a 'u'
        try
        {
           while ((c = (char)((char)0xff & ReadByte())) == 'u")
              ++column;

           buffer[bufpos] = c = (char)(hexval(c) << 12 |
                                       hexval((char)((char)0xff & ReadByte())) << 8 |
                                       hexval((char)((char)0xff & ReadByte())) << 4 |
                                       hexval((char)((char)0xff & 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);
     }