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org.apache.tomcat.util.json.JavaCharStream Maven / Gradle / Ivy
/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 7.0 */
/* JavaCCOptions:STATIC=false,SUPPORT_CLASS_VISIBILITY_PUBLIC=true */
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tomcat.util.json;
/**
* An implementation of interface CharStream, where the stream is assumed to
* contain only ASCII characters (with java-like unicode escape processing).
*/
@SuppressWarnings("all") // Ignore warnings in generated code
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 = 1;
protected boolean trackLineColumn = true;
public void setTabSize(int i) { tabSize = i; }
public int getTabSize() { 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;
}
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()) == '\\')
{
if (trackLineColumn) { UpdateLineColumn(c); }
int backSlashCnt = 1;
for (;;) // Read all the backslashes
{
if (++bufpos == available) {
AdjustBuffSize();
}
try
{
if ((buffer[bufpos] = c = ReadByte()) != '\\')
{
if (trackLineColumn) { 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 '\\';
}
if (trackLineColumn) { 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);
}
/** Constructor. */
public JavaCharStream(java.io.Reader dstream)
{
this(dstream, 1, 1, 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);
}
/** Reinitialise. */
public void ReInit(java.io.Reader dstream)
{
ReInit(dstream, 1, 1, 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) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
}
/** Constructor. */
public JavaCharStream(java.io.InputStream dstream, int startline,
int startcolumn, int buffersize)
{
this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
}
/** Constructor. */
public JavaCharStream(java.io.InputStream dstream, String encoding, int startline,
int startcolumn) throws java.io.UnsupportedEncodingException
{
this(dstream, encoding, startline, startcolumn, 4096);
}
/** Constructor. */
public JavaCharStream(java.io.InputStream dstream, int startline,
int startcolumn)
{
this(dstream, startline, startcolumn, 4096);
}
/** Constructor. */
public JavaCharStream(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException
{
this(dstream, encoding, 1, 1, 4096);
}
/** Constructor. */
public JavaCharStream(java.io.InputStream dstream)
{
this(dstream, 1, 1, 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) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, int startline,
int startcolumn, int buffersize)
{
ReInit(new java.io.InputStreamReader(dstream), 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);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, int startline,
int startcolumn)
{
ReInit(dstream, startline, startcolumn, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException
{
ReInit(dstream, encoding, 1, 1, 4096);
}
/** Reinitialise. */
public void ReInit(java.io.InputStream dstream)
{
ReInit(dstream, 1, 1, 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];
}
boolean getTrackLineColumn() { return trackLineColumn; }
void setTrackLineColumn(boolean tlc) { trackLineColumn = tlc; }
}
/* JavaCC - OriginalChecksum=58f718af3466d6064ba0132bca4fbce2 (do not edit this line) */
