View Javadoc

    1   /* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 3.0 */
    2   package org.apache.commons.jxpath.ri.parser;
    3
    4   /***
    5    * An implementation of interface CharStream, where the stream is assumed to
    6    * contain only ASCII characters (without unicode processing).
    7    */
    8
    9   public class SimpleCharStream
    10  {
    11    public static final boolean staticFlag = false;
    12    int bufsize;
    13    int available;
    14    int tokenBegin;
    15    public int bufpos = -1;
    16    protected int bufline[];
    17    protected int bufcolumn[];
    18
    19    protected int column = 0;
    20    protected int line = 1;
    21
    22    protected boolean prevCharIsCR = false;
    23    protected boolean prevCharIsLF = false;
    24
    25    protected java.io.Reader inputStream;
    26
    27    protected char[] buffer;
    28    protected int maxNextCharInd = 0;
    29    protected int inBuf = 0;
    30
    31    protected void ExpandBuff(boolean wrapAround)
    32    {
    33       char[] newbuffer = new char[bufsize + 2048];
    34       int newbufline[] = new int[bufsize + 2048];
    35       int newbufcolumn[] = new int[bufsize + 2048];
    36
    37       try
    38       {
    39          if (wrapAround)
    40          {
    41             System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
    42             System.arraycopy(buffer, 0, newbuffer,
    43                                               bufsize - tokenBegin, bufpos);
    44             buffer = newbuffer;
    45
    46             System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
    47             System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
    48             bufline = newbufline;
    49
    50             System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
    51             System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
    52             bufcolumn = newbufcolumn;
    53
    54             maxNextCharInd = (bufpos += (bufsize - tokenBegin));
    55          }
    56          else
    57          {
    58             System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
    59             buffer = newbuffer;
    60
    61             System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
    62             bufline = newbufline;
    63
    64             System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
    65             bufcolumn = newbufcolumn;
    66
    67             maxNextCharInd = (bufpos -= tokenBegin);
    68          }
    69       }
    70       catch (Throwable t)
    71       {
    72          throw new Error(t.getMessage());
    73       }
    74
    75
    76       bufsize += 2048;
    77       available = bufsize;
    78       tokenBegin = 0;
    79    }
    80
    81    protected void FillBuff() throws java.io.IOException
    82    {
    83       if (maxNextCharInd == available)
    84       {
    85          if (available == bufsize)
    86          {
    87             if (tokenBegin > 2048)
    88             {
    89                bufpos = maxNextCharInd = 0;
    90                available = tokenBegin;
    91             }
    92             else if (tokenBegin < 0)
    93                bufpos = maxNextCharInd = 0;
    94             else
    95                ExpandBuff(false);
    96          }
    97          else if (available > tokenBegin)
    98             available = bufsize;
    99          else if ((tokenBegin - available) < 2048)
    100            ExpandBuff(true);
    101         else
    102            available = tokenBegin;
    103      }
    104
    105      int i;
    106      try {
    107         if ((i = inputStream.read(buffer, maxNextCharInd,
    108                                     available - maxNextCharInd)) == -1)
    109         {
    110            inputStream.close();
    111            throw new java.io.IOException();
    112         }
    113         else
    114            maxNextCharInd += i;
    115         return;
    116      }
    117      catch(java.io.IOException e) {
    118         --bufpos;
    119         backup(0);
    120         if (tokenBegin == -1)
    121            tokenBegin = bufpos;
    122         throw e;
    123      }
    124   }
    125
    126   public char BeginToken() throws java.io.IOException
    127   {
    128      tokenBegin = -1;
    129      char c = readChar();
    130      tokenBegin = bufpos;
    131
    132      return c;
    133   }
    134
    135   protected void UpdateLineColumn(char c)
    136   {
    137      column++;
    138
    139      if (prevCharIsLF)
    140      {
    141         prevCharIsLF = false;
    142         line += (column = 1);
    143      }
    144      else if (prevCharIsCR)
    145      {
    146         prevCharIsCR = false;
    147         if (c == '\n')
    148         {
    149            prevCharIsLF = true;
    150         }
    151         else
    152            line += (column = 1);
    153      }
    154
    155      switch (c)
    156      {
    157         case '\r' :
    158            prevCharIsCR = true;
    159            break;
    160         case '\n' :
    161            prevCharIsLF = true;
    162            break;
    163         case '\t' :
    164            column--;
    165            column += (8 - (column & 07));
    166            break;
    167         default :
    168            break;
    169      }
    170
    171      bufline[bufpos] = line;
    172      bufcolumn[bufpos] = column;
    173   }
    174
    175   public char readChar() throws java.io.IOException
    176   {
    177      if (inBuf > 0)
    178      {
    179         --inBuf;
    180
    181         if (++bufpos == bufsize)
    182            bufpos = 0;
    183
    184         return buffer[bufpos];
    185      }
    186
    187      if (++bufpos >= maxNextCharInd)
    188         FillBuff();
    189
    190      char c = buffer[bufpos];
    191
    192      UpdateLineColumn(c);
    193      return (c);
    194   }
    195
    196   /***
    197    * @deprecated
    198    * @see #getEndColumn
    199    */
    200
    201   public int getColumn() {
    202      return bufcolumn[bufpos];
    203   }
    204
    205   /***
    206    * @deprecated
    207    * @see #getEndLine
    208    */
    209
    210   public int getLine() {
    211      return bufline[bufpos];
    212   }
    213
    214   public int getEndColumn() {
    215      return bufcolumn[bufpos];
    216   }
    217
    218   public int getEndLine() {
    219      return bufline[bufpos];
    220   }
    221
    222   public int getBeginColumn() {
    223      return bufcolumn[tokenBegin];
    224   }
    225
    226   public int getBeginLine() {
    227      return bufline[tokenBegin];
    228   }
    229
    230   public void backup(int amount) {
    231
    232     inBuf += amount;
    233     if ((bufpos -= amount) < 0)
    234        bufpos += bufsize;
    235   }
    236
    237   public SimpleCharStream(java.io.Reader dstream, int startline,
    238   int startcolumn, int buffersize)
    239   {
    240     inputStream = dstream;
    241     line = startline;
    242     column = startcolumn - 1;
    243
    244     available = bufsize = buffersize;
    245     buffer = new char[buffersize];
    246     bufline = new int[buffersize];
    247     bufcolumn = new int[buffersize];
    248   }
    249
    250   public SimpleCharStream(java.io.Reader dstream, int startline,
    251                                                            int startcolumn)
    252   {
    253      this(dstream, startline, startcolumn, 4096);
    254   }
    255
    256   public SimpleCharStream(java.io.Reader dstream)
    257   {
    258      this(dstream, 1, 1, 4096);
    259   }
    260   public void ReInit(java.io.Reader dstream, int startline,
    261   int startcolumn, int buffersize)
    262   {
    263     inputStream = dstream;
    264     line = startline;
    265     column = startcolumn - 1;
    266
    267     if (buffer == null || buffersize != buffer.length)
    268     {
    269       available = bufsize = buffersize;
    270       buffer = new char[buffersize];
    271       bufline = new int[buffersize];
    272       bufcolumn = new int[buffersize];
    273     }
    274     prevCharIsLF = prevCharIsCR = false;
    275     tokenBegin = inBuf = maxNextCharInd = 0;
    276     bufpos = -1;
    277   }
    278
    279   public void ReInit(java.io.Reader dstream, int startline,
    280                                                            int startcolumn)
    281   {
    282      ReInit(dstream, startline, startcolumn, 4096);
    283   }
    284
    285   public void ReInit(java.io.Reader dstream)
    286   {
    287      ReInit(dstream, 1, 1, 4096);
    288   }
    289   public SimpleCharStream(java.io.InputStream dstream, int startline,
    290   int startcolumn, int buffersize)
    291   {
    292      this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
    293   }
    294
    295   public SimpleCharStream(java.io.InputStream dstream, int startline,
    296                                                            int startcolumn)
    297   {
    298      this(dstream, startline, startcolumn, 4096);
    299   }
    300
    301   public SimpleCharStream(java.io.InputStream dstream)
    302   {
    303      this(dstream, 1, 1, 4096);
    304   }
    305
    306   public void ReInit(java.io.InputStream dstream, int startline,
    307                           int startcolumn, int buffersize)
    308   {
    309      ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
    310   }
    311
    312   public void ReInit(java.io.InputStream dstream)
    313   {
    314      ReInit(dstream, 1, 1, 4096);
    315   }
    316   public void ReInit(java.io.InputStream dstream, int startline,
    317                                                            int startcolumn)
    318   {
    319      ReInit(dstream, startline, startcolumn, 4096);
    320   }
    321   public String GetImage()
    322   {
    323      if (bufpos >= tokenBegin)
    324         return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
    325      else
    326         return new String(buffer, tokenBegin, bufsize - tokenBegin) +
    327                               new String(buffer, 0, bufpos + 1);
    328   }
    329
    330   public char[] GetSuffix(int len)
    331   {
    332      char[] ret = new char[len];
    333
    334      if ((bufpos + 1) >= len)
    335         System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
    336      else
    337      {
    338         System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0,
    339                                                           len - bufpos - 1);
    340         System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
    341      }
    342
    343      return ret;
    344   }
    345
    346   public void Done()
    347   {
    348      buffer = null;
    349      bufline = null;
    350      bufcolumn = null;
    351   }
    352
    353   /***
    354    * Method to adjust line and column numbers for the start of a token.<BR>
    355    */
    356   public void adjustBeginLineColumn(int newLine, int newCol)
    357   {
    358      int start = tokenBegin;
    359      int len;
    360
    361      if (bufpos >= tokenBegin)
    362      {
    363         len = bufpos - tokenBegin + inBuf + 1;
    364      }
    365      else
    366      {
    367         len = bufsize - tokenBegin + bufpos + 1 + inBuf;
    368      }
    369
    370      int i = 0, j = 0, k = 0;
    371      int nextColDiff = 0, columnDiff = 0;
    372
    373      while (i < len &&
    374             bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
    375      {
    376         bufline[j] = newLine;
    377         nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
    378         bufcolumn[j] = newCol + columnDiff;
    379         columnDiff = nextColDiff;
    380         i++;
    381      }
    382
    383      if (i < len)
    384      {
    385         bufline[j] = newLine++;
    386         bufcolumn[j] = newCol + columnDiff;
    387
    388         while (i++ < len)
    389         {
    390            if (bufline[j = start % bufsize] != bufline[++start % bufsize])
    391               bufline[j] = newLine++;
    392            else
    393               bufline[j] = newLine;
    394         }
    395      }
    396
    397      line = bufline[j];
    398      column = bufcolumn[j];
    399   }
    400
    401 }