SimpleCharStreampublic class SimpleCharStream extends Object | An implementation of interface CharStream, where the stream is assumed to
contain only ASCII characters (without unicode processing). |
| Fields Summary |
|---|
| public static final boolean | staticFlag | | int | bufsize | | int | available | | int | tokenBegin | | public int | bufpos | | protected int[] | bufline | | protected int[] | bufcolumn | | protected int | column | | protected int | line | | protected boolean | prevCharIsCR | | protected boolean | prevCharIsLF | | protected Reader | inputStream | | protected char[] | buffer | | protected int | maxNextCharInd | | protected int | inBuf | | protected int | tabSize |
| Constructors Summary |
|---|
public SimpleCharStream(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];
| public SimpleCharStream(Reader dstream, int startline, int startcolumn)
this(dstream, startline, startcolumn, 4096);
| public SimpleCharStream(Reader dstream)
this(dstream, 1, 1, 4096);
| public SimpleCharStream(InputStream dstream, String encoding, int startline, int startcolumn, int buffersize)
this(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
| public SimpleCharStream(InputStream dstream, int startline, int startcolumn, int buffersize)
this(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
| public SimpleCharStream(InputStream dstream, String encoding, int startline, int startcolumn)
this(dstream, encoding, startline, startcolumn, 4096);
| public SimpleCharStream(InputStream dstream, int startline, int startcolumn)
this(dstream, startline, startcolumn, 4096);
| public SimpleCharStream(InputStream dstream, String encoding)
this(dstream, encoding, 1, 1, 4096);
| public SimpleCharStream(InputStream dstream)
this(dstream, 1, 1, 4096);
|
| Methods Summary |
|---|
| public char | BeginToken()
tokenBegin = -1;
char c = readChar();
tokenBegin = bufpos;
return c;
| | public void | Done()
buffer = null;
bufline = null;
bufcolumn = null;
| | 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;
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 (Throwable t)
{
throw new Error(t.getMessage());
}
bufsize += 2048;
available = bufsize;
tokenBegin = 0;
| | protected void | FillBuff()
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();
}
else
maxNextCharInd += i;
return;
}
catch(java.io.IOException e) {
--bufpos;
backup(0);
if (tokenBegin == -1)
tokenBegin = bufpos;
throw e;
}
| | public java.lang.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 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 | 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];
}
prevCharIsLF = prevCharIsCR = false;
tokenBegin = inBuf = maxNextCharInd = 0;
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 void | ReInit(java.io.InputStream dstream, java.lang.String encoding, int startline, int startcolumn, int buffersize)
ReInit(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
| | public void | ReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
| | public void | ReInit(java.io.InputStream dstream, java.lang.String encoding)
ReInit(dstream, encoding, 1, 1, 4096);
| | public void | ReInit(java.io.InputStream dstream)
ReInit(dstream, 1, 1, 4096);
| | public void | ReInit(java.io.InputStream dstream, java.lang.String encoding, int startline, int startcolumn)
ReInit(dstream, encoding, startline, startcolumn, 4096);
| | public void | ReInit(java.io.InputStream dstream, int startline, int startcolumn)
ReInit(dstream, startline, startcolumn, 4096);
| | 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;
| | public void | adjustBeginLineColumn(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 void | backup(int amount)
inBuf += amount;
if ((bufpos -= amount) < 0)
bufpos += bufsize;
| | public int | getBeginColumn()
return bufcolumn[tokenBegin];
| | public int | getBeginLine()
return bufline[tokenBegin];
| | public int | getColumn()
return bufcolumn[bufpos];
| | public int | getEndColumn()
return bufcolumn[bufpos];
| | public int | getEndLine()
return bufline[bufpos];
| | public int | getLine()
return bufline[bufpos];
| | protected int | getTabSize(int i) return tabSize;
| | public char | readChar()
if (inBuf > 0)
{
--inBuf;
if (++bufpos == bufsize)
bufpos = 0;
return buffer[bufpos];
}
if (++bufpos >= maxNextCharInd)
FillBuff();
char c = buffer[bufpos];
UpdateLineColumn(c);
return (c);
| | protected void | setTabSize(int i)
tabSize = i;
|
|
