org.htmlunit.cssparser.parser.CssCharStream Maven / Gradle / Ivy
/* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 5.0 */
/* JavaCCOptions:STATIC=false,SUPPORT_CLASS_VISIBILITY_PUBLIC=true */
package org.htmlunit.cssparser.parser;
import org.htmlunit.cssparser.parser.javacc.CharStream;
/**
* An implementation of interface CharStream.
* There is no processing of escaping in this class because the escaping is
* part of the parser. CSS has some strange rules about that, so processing
* unicode escapes in this class is too early.
*/
@SuppressWarnings("all")
public final class CssCharStream implements CharStream
{
/** Whether parser is static. */
public static final boolean staticFlag = false;
private static final int BUFFER_SIZE = 2048;
int bufsize;
int available;
int tokenBegin;
/** Position in buffer. */
public int bufpos = -1;
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[] buffer;
private int maxNextCharInd = 0;
private int inBuf = 0;
private int tabSize = 1;
private boolean trackLineColumn = true;
private void ExpandBuff(boolean wrapAround)
{
char[] newbuffer = new char[bufsize + BUFFER_SIZE];
int newbufline[] = new int[bufsize + BUFFER_SIZE];
int newbufcolumn[] = new int[bufsize + BUFFER_SIZE];
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 += BUFFER_SIZE;
available = bufsize;
tokenBegin = 0;
}
private final void FillBuff() throws java.io.IOException
{
if (maxNextCharInd == available)
{
if (available == bufsize)
{
if (tokenBegin > BUFFER_SIZE)
{
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) < BUFFER_SIZE)
ExpandBuff(true);
else
available = tokenBegin;
}
int i;
try {
if ((i = inputStream.read(buffer, maxNextCharInd, available - maxNextCharInd)) == -1)
{
inputStream.close();
throw new java.io.IOException();
}
maxNextCharInd += i;
return;
}
catch(java.io.IOException e) {
--bufpos;
backup(0);
if (tokenBegin == -1)
tokenBegin = bufpos;
throw e;
}
}
/** Start. */
@Override
public final char beginToken() throws java.io.IOException
{
tokenBegin = -1;
char c = readChar();
tokenBegin = bufpos;
return c;
}
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;
}
/**
* {@inheritDoc}
*
* Read a character.
*/
@Override
public final char readChar() throws java.io.IOException
{
if (inBuf > 0)
{
--inBuf;
if (++bufpos == bufsize)
bufpos = 0;
return buffer[bufpos];
}
if (++bufpos >= maxNextCharInd)
FillBuff();
char c = buffer[bufpos];
UpdateLineColumn(c);
return c;
}
/**
* {@inheritDoc}
*
* Get token end column number.
*/
@Override
public final int getEndColumn() {
return bufcolumn[bufpos];
}
/**
* {@inheritDoc}
*
* Get token end line number.
*/
@Override
public final int getEndLine() {
return bufline[bufpos];
}
/**
* {@inheritDoc}
*
* Get token beginning column number.
*/
@Override
public final int getBeginColumn() {
return bufcolumn[tokenBegin];
}
/**
* {@inheritDoc}
*
* Get token beginning line number.
*/
@Override
public final int getBeginLine() {
return bufline[tokenBegin];
}
/**
* {@inheritDoc}
*
* Backup a number of characters.
*/
@Override
public final void backup(int amount) {
inBuf += amount;
if ((bufpos -= amount) < 0)
bufpos += bufsize;
}
/**
* Constructor.
* @param dstream the stream to read from
* @param startline startline
* @param startcolumn startcolumn
* @param buffersize buffersize
*/
public CssCharStream(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];
}
/**
* Constructor.
* @param dstream the stream to read from
* @param startline startline
* @param startcolumn startcolumn
*/
public CssCharStream(java.io.Reader dstream, int startline, int startcolumn)
{
this(dstream, startline, startcolumn, 4096);
}
/**
* {@inheritDoc}
*
* Get token literal value.
*/
@Override
public final String getImage()
{
if (bufpos >= tokenBegin)
return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
return new String(buffer, tokenBegin, bufsize - tokenBegin) + new String(buffer, 0, bufpos + 1);
}
/**
* {@inheritDoc}
*
* Get the suffix.
*/
@Override
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;
}
/**
* {@inheritDoc}
*
* Reset buffer when finished.
*/
@Override
public void done()
{
buffer = null;
bufline = null;
bufcolumn = null;
}
/**
* Method to adjust line and column numbers for the start of a token.
* @param newLine the new line
* @param newCol the new column
*/
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];
}
/** {@inheritDoc} */
@Override
public void setTabSize(int i) {
tabSize = i;
}
/** {@inheritDoc} */
@Override
public int getTabSize() {
return tabSize;
}
/** {@inheritDoc} */
@Override
public boolean isTrackLineColumn() {
return trackLineColumn;
}
/** {@inheritDoc} */
@Override
public void setTrackLineColumn(boolean tlc) {
trackLineColumn = tlc;
}
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