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/*
* This file is part of the OWL API.
*
* The contents of this file are subject to the LGPL License, Version 3.0.
*
* Copyright (C) 2011, Ulm University
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
*
* Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
* in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
*
* Copyright 2011, Ulm University
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package de.uulm.ecs.ai.owlapi.krssparser;
/**
* An implementation of interface CharStream, where the stream is assumed to
* contain only ASCII characters (with java-like unicode escape processing).
*/
@SuppressWarnings("javadoc")
public class JavaCharStream {
/** Whether parser is static. */
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
}
/** Position in buffer. */
public int bufpos = -1;
int bufsize;
int available;
int tokenBegin;
protected int bufline[];
protected int bufcolumn[];
protected int column = 0;
protected int line = 1;
protected boolean prevCharIsCR = false;
protected boolean prevCharIsLF = false;
protected java.io.Reader inputStream;
protected char[] nextCharBuf;
protected char[] buffer;
protected int maxNextCharInd = 0;
protected int nextCharInd = -1;
protected int inBuf = 0;
protected int tabSize = 8;
private boolean beginning = true;
protected void setTabSize(int i) {
tabSize = i;
}
@SuppressWarnings("unused")
protected int getTabSize(int i) {
return tabSize;
}
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;
}
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;
if (beginning && nextCharBuf[0] == '\uFEFF') {
nextCharInd++;
beginning = false;
}
return;
} catch (java.io.IOException e) {
if (bufpos != 0) {
--bufpos;
backup(0);
} else {
bufline[bufpos] = line;
bufcolumn[bufpos] = column;
}
throw e;
}
}
protected char ReadByte() throws java.io.IOException {
if (++nextCharInd >= maxNextCharInd)
FillBuff();
return nextCharBuf[nextCharInd];
}
/** @return starting character for token. */
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();
}
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;
}
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;
}
/** Read a character. */
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 '\\';
}
} catch (java.io.IOException e) {
// We are returning one backslash so we should only backup (count-1)
if (backSlashCnt > 1)
backup(backSlashCnt - 1);
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
/**
* @deprecated
* @see #getEndColumn
*/
public int getColumn() {
return bufcolumn[bufpos];
}
@Deprecated
/**
* @deprecated
* @see #getEndLine
*/
public int getLine() {
return bufline[bufpos];
}
/** Get end column. */
public int getEndColumn() {
return bufcolumn[bufpos];
}
/** Get end line. */
public int getEndLine() {
return bufline[bufpos];
}
/** @return column of token start */
public int getBeginColumn() {
return bufcolumn[tokenBegin];
}
/** @return line number of token start */
public int getBeginLine() {
return bufline[tokenBegin];
}
/** Retreat. */
public void backup(int amount) {
inBuf += amount;
if ((bufpos -= amount) < 0)
bufpos += bufsize;
}
/** Constructor. */
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];
}
/** Constructor. */
public JavaCharStream(java.io.Reader dstream, int startline, int startcolumn) {
this(dstream, startline, startcolumn, 4096);
}
/** Reinitialise. */
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;
}
/** Reinitialise. */
public void ReInit(java.io.Reader dstream, int startline, int startcolumn) {
ReInit(dstream, startline, startcolumn, 4096);
}
/** Constructor. */
public JavaCharStream(java.io.InputStream dstream, String encoding,
int startline, int startcolumn, int buffersize)
throws java.io.UnsupportedEncodingException {
this(encoding == null ? new java.io.InputStreamReader(dstream, "UTF-8")
: new java.io.InputStreamReader(dstream, encoding), startline,
startcolumn, buffersize);
}
/** Constructor. */
public JavaCharStream(java.io.InputStream dstream, String encoding,
int startline, int startcolumn)
throws java.io.UnsupportedEncodingException {
this(dstream, encoding, startline, startcolumn, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, String encoding,
int startline, int startcolumn, int buffersize)
throws java.io.UnsupportedEncodingException {
ReInit(encoding == null ? new java.io.InputStreamReader(dstream,
"UTF-8") : new java.io.InputStreamReader(dstream, encoding),
startline, startcolumn, buffersize);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, String encoding,
int startline, int startcolumn)
throws java.io.UnsupportedEncodingException {
ReInit(dstream, encoding, startline, startcolumn, 4096);
}
/** @return token image as String */
public 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);
}
/** @return suffix */
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;
}
/** Set buffers back to null when finished. */
public void Done() {
nextCharBuf = null;
buffer = null;
bufline = null;
bufcolumn = null;
}
/**
* Method to adjust line and column numbers for the start of a token.
*/
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];
}
}
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