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net.hasor.db.jsqlparser.parser.SimpleCharStream Maven / Gradle / Ivy
/*-
* #%L
* JSQLParser library
* %%
* Copyright (C) 2004 - 2019 JSQLParser
* %%
* Dual licensed under GNU LGPL 2.1 or Apache License 2.0
* #L%
*/
package net.sf.jsqlparser.parser;
public class SimpleCharStream {
/**
* Whether parser is static.
*/
@SuppressWarnings("checkstyle:constantname")
public static final boolean staticFlag = false;
int bufsize;
int available;
int tokenBegin;
/**
* Position in buffer.
*/
public int bufpos = -1;
protected int bufline[];
protected int bufcolumn[];
protected int column = 0;
protected int line = 1;
protected boolean prevCharIsCR = false;
protected boolean prevCharIsLF = false;
protected Provider inputStream;
private boolean isStringProvider;
protected char[] buffer;
protected int maxNextCharInd = 0;
protected int inBuf = 0;
protected int tabSize = 1;
protected boolean trackLineColumn = true;
protected int totalCharsRead = 0;
protected int absoluteTokenBegin = 0;
public void setTabSize(int i) {
tabSize = i;
}
public int getTabSize() {
return tabSize;
}
public final int getAbsoluteTokenBegin() {
return absoluteTokenBegin;
}
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 RuntimeException(t.getMessage());
}
bufsize += 2048;
available = bufsize;
tokenBegin = 0;
}
protected void FillBuff() throws java.io.IOException {
if (!isStringProvider && 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 (inputStream instanceof StringProvider) {
i = ((StringProvider) inputStream)._string.length();
if (maxNextCharInd == i) {
throw new java.io.IOException();
}
maxNextCharInd = i;
} else {
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;
}
}
/**
* Start.
*/
public char BeginToken() throws java.io.IOException {
tokenBegin = -1;
char c = readChar();
tokenBegin = bufpos;
absoluteTokenBegin = totalCharsRead;
return c;
}
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;
}
private char readChar(int pos) {
if (this.inputStream instanceof StringProvider) {
return ((StringProvider) inputStream)._string.charAt(pos);
} else {
return buffer[pos];
}
}
/**
* Read a character.
*/
public char readChar() throws java.io.IOException {
if (inBuf > 0) {
--inBuf;
if (++bufpos == bufsize) {
bufpos = 0;
}
totalCharsRead++;
return readChar(bufpos);
}
if (++bufpos >= maxNextCharInd) {
FillBuff();
}
totalCharsRead++;
char c = readChar(bufpos);
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 token end column number.
*/
public int getEndColumn() {
return bufcolumn[bufpos];
}
/**
* Get token end line number.
*/
public int getEndLine() {
return bufline[bufpos];
}
/**
* Get token beginning column number.
*/
public int getBeginColumn() {
return bufcolumn[tokenBegin];
}
/**
* Get token beginning line number.
*/
public int getBeginLine() {
return bufline[tokenBegin];
}
/**
* Backup a number of characters.
*/
public void backup(int amount) {
inBuf += amount;
totalCharsRead -= amount;
if ((bufpos -= amount) < 0) {
bufpos += bufsize;
}
}
/**
* Constructor.
*/
public SimpleCharStream(Provider dstream, int startline,
int startcolumn, int buffersize) {
inputStream = dstream;
isStringProvider = dstream instanceof StringProvider;
line = startline;
column = startcolumn - 1;
if (isStringProvider) {
int bs = ((StringProvider) inputStream)._string.length();
available = bufsize = bs;
bufline = new int[bs];
bufcolumn = new int[bs];
} else {
available = bufsize = buffersize;
buffer = new char[buffersize];
bufline = new int[buffersize];
bufcolumn = new int[buffersize];
}
}
/**
* Constructor.
*/
public SimpleCharStream(Provider dstream, int startline,
int startcolumn) {
this(dstream, startline, startcolumn, 4096);
}
/**
* Constructor.
*/
public SimpleCharStream(Provider dstream) {
this(dstream, 1, 1, 4096);
}
/**
* Reinitialise.
*/
public void ReInit(Provider dstream, int startline,
int startcolumn, int buffersize) {
inputStream = dstream;
isStringProvider = dstream instanceof StringProvider;
line = startline;
column = startcolumn - 1;
if (isStringProvider) {
int bs = ((StringProvider) inputStream)._string.length();
available = bufsize = bs;
bufline = new int[bs];
bufcolumn = new int[bs];
} else {
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;
}
/**
* Reinitialise.
*/
public void ReInit(Provider dstream, int startline,
int startcolumn) {
ReInit(dstream, startline, startcolumn, 4096);
}
/**
* Reinitialise.
*/
public void ReInit(Provider dstream) {
ReInit(dstream, 1, 1, 4096);
}
/**
* Get token literal value.
*/
public String GetImage() {
if (isStringProvider) {
String data = ((StringProvider) inputStream)._string;
if (bufpos >= tokenBegin) {
return data.substring(tokenBegin, bufpos + 1);
} else {
return data.substring(tokenBegin, bufsize)
+ data.substring(0, bufpos + 1);
}
} else {
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);
}
}
}
/**
* Get the suffix.
*/
public char[] GetSuffix(int len) {
char[] ret = new char[len];
if (isStringProvider) {
String str = ((StringProvider) inputStream)._string;
if ((bufpos + 1) >= len) {
str.getChars(bufpos - len + 1, bufpos - len + 1 + len, ret, 0);
} else {
str.getChars(bufsize - (len - bufpos - 1), bufsize - (len - bufpos - 1) + len - bufpos - 1, ret, 0);
str.getChars(0, bufpos + 1, ret, len - bufpos - 1);
}
} else {
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;
}
/**
* Reset buffer when finished.
*/
public void Done() {
buffer = null;
bufline = null;
bufcolumn = null;
}
/**
* Method to adjust line and column numbers for the start of a token.
*/
@SuppressWarnings("checkstyle:parameterassignment")
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;
int j = 0;
int k = 0;
int nextColDiff = 0;
int 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=47e65cd0a1ed785f7a51c9e0c60893c9 (do not edit this line) */
