javacharstream.java

脚本开发工具和源代码,用于J2me中RPG游戏的脚本开发和执行,相当好用的一套工具,并含有脚本开发工具的源代码和一个现成的游戏脚本

/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 4.0 */
package scriptedit;

/**
 * An implementation of interface CharStream, where the stream is assumed to
 * contain only ASCII characters (with java-like unicode escape processing).
 */

public class JavaCharStream
{
  public static final boolean staticFlag = true;
  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
  }

  static public int bufpos = -1;
  static int bufsize;
  static int available;
  static int tokenBegin;
  static protected int bufline[];
  static protected int bufcolumn[];

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

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

  static protected java.io.Reader inputStream;

  static protected char[] nextCharBuf;
  static protected char[] buffer;
  static protected int maxNextCharInd = 0;
  static protected int nextCharInd = -1;
  static protected int inBuf = 0;
  static protected int tabSize = 8;

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

  static 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;
  }

  static 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;
     }
  }

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

     return nextCharBuf[nextCharInd];
  }

  static 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();
  }     

  static 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;
  }

  static 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;
  }

  static 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 '\\';
              }