1 files changed, 546 insertions, 0 deletions
diff --git a/src/main/java/io/devnulllabs/openjava/tools/parser/JavaCharStream.java b/src/main/java/io/devnulllabs/openjava/tools/parser/JavaCharStream.java
new file mode 100644
index 0000000..4f15719
--- /dev/null
+++ b/src/main/java/io/devnulllabs/openjava/tools/parser/JavaCharStream.java
@@ -0,0 +1,546 @@
+package io.devnulllabs.openjava.tools.parser;
+
+/**
+ * An implementation of interface CharStream, where the stream is assumed to
+ * contain only ASCII characters (with java-like unicode escape processing).
+ */
+
+public final class JavaCharStream
+{
+  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
+  }
+
+  public int bufpos = -1;
+  int bufsize;
+  int available;
+  int tokenBegin;
+  private int bufline[];
+  private int bufcolumn[];
+
+  private int column = 0;
+  private int line = 1;
+
+  private boolean prevCharIsCR = false;
+  private boolean prevCharIsLF = false;
+
+  private java.io.Reader inputStream;
+
+  private char[] nextCharBuf;
+  private char[] buffer;
+  private int maxNextCharInd = 0;
+  private int nextCharInd = -1;
+  private int inBuf = 0;
+
+  private final 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;
+  }
+
+  private final 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;
+     }
+  }
+
+  private final char ReadByte() throws java.io.IOException
+  {
+     if (++nextCharInd >= maxNextCharInd)
+        FillBuff();
+
+     return nextCharBuf[nextCharInd];
+  }
+
+  public final 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();
+  }     
+
+  private final 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;
+  }
+
+  private final 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 += (8 - (column & 07));
+           break;
+        default :
+           break;
+     }
+
+     bufline[bufpos] = line;
+     bufcolumn[bufpos] = column;
+  }
+
+  public final 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)
+           {
+              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 = 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 
+   * @see #getEndColumn
+   */
+
+  public final int getColumn() {
+     return bufcolumn[bufpos];
+  }
+
+  /**
+   * @deprecated 
+   * @see #getEndLine
+   */
+
+  public final int getLine() {
+     return bufline[bufpos];
+  }
+
+  public final int getEndColumn() {
+     return bufcolumn[bufpos];
+  }
+
+  public final int getEndLine() {
+     return bufline[bufpos];
+  }
+
+  public final int getBeginColumn() {
+     return bufcolumn[tokenBegin];
+  }
+
+  public final int getBeginLine() {
+     return bufline[tokenBegin];
+  }
+
+  public final void backup(int amount) {
+
+    inBuf += amount;
+    if ((bufpos -= amount) < 0)
+       bufpos += bufsize;
+  }
+
+  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];
+  }
+
+  public JavaCharStream(java.io.Reader dstream,
+                                        int startline, int startcolumn)
+  {
+     this(dstream, startline, startcolumn, 4096);
+  }
+
+  public JavaCharStream(java.io.Reader dstream)
+  {
+     this(dstream, 1, 1, 4096);
+  }
+  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;
+  }
+
+  public void ReInit(java.io.Reader dstream,
+                                        int startline, int startcolumn)
+  {
+     ReInit(dstream, startline, startcolumn, 4096);
+  }
+
+  public void ReInit(java.io.Reader dstream)
+  {
+     ReInit(dstream, 1, 1, 4096);
+  }
+  public JavaCharStream(java.io.InputStream dstream, int startline,
+  int startcolumn, int buffersize)
+  {
+     this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
+  }
+
+  public JavaCharStream(java.io.InputStream dstream, int startline,
+                                                           int startcolumn)
+  {
+     this(dstream, startline, startcolumn, 4096);
+  }
+
+  public JavaCharStream(java.io.InputStream dstream)
+  {
+     this(dstream, 1, 1, 4096);
+  }
+
+  public void ReInit(java.io.InputStream dstream, int startline,
+  int startcolumn, int buffersize)
+  {
+     ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
+  }
+  public void ReInit(java.io.InputStream dstream, int startline,
+                                                           int startcolumn)
+  {
+     ReInit(dstream, startline, startcolumn, 4096);
+  }
+  public void ReInit(java.io.InputStream dstream)
+  {
+     ReInit(dstream, 1, 1, 4096);
+  }
+
+  public final 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);
+  }
+
+  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 void Done()
+  {
+     nextCharBuf = null;
+     buffer = null;
+     bufline = null;
+     bufcolumn = null;
+  }
+
+  /**
+   * Method to adjust line and column numbers for the start of a token.<BR>
+   */
+  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];
+  }
+
+}