org.monte.media.io.StreamPosTokenizer Maven / Gradle / Ivy
/*
* @(#)StreamPosTokenizer.java
*
* Copyright (c) 2000-2011 Werner Randelshofer, Goldau, Switzerland.
* All rights reserved.
*
* You may not use, copy or modify this file, except in compliance with the
* license agreement you entered into with Werner Randelshofer.
* For details see accompanying license terms.
*/
package org.monte.media.io;
import java.io.*;
import java.util.Vector;
/**
* This extension of StreamTokenizer keeps track
* of the position of the tokens in the input stream, and it can
* parse hexadecimal numbers and double numbers with exponents.
*
* The handling of numeric data is also different: a single dot
* '.' and minus dot '-.' are not treated as numbers.
*
* @author Werner Randelshofer, Hausmatt 10, Goldau, CH-6405, Switzerland
* @version $Id: StreamPosTokenizer.java 299 2013-01-03 07:40:18Z werner $
*/
public class StreamPosTokenizer
/*extends StreamTokenizer*/ {
private Reader reader = null;
/**
* Position of the next character that will be read from the file.
* rlw
*/
private int readpos = 0;
/**
* Start and end position of the current token.
* rlw
*/
private int startpos = -1, endpos = -1;
private Vector unread = new Vector();
private char buf[] = new char[20];
/**
* The next character to be considered by the nextToken method. May also
* be NEED_CHAR to indicate that a new character should be read, or SKIP_LF
* to indicate that a new character should be read and, if it is a '\n'
* character, it should be discarded and a second new character should be
* read.
*/
private int peekc = NEED_CHAR;
private static final int NEED_CHAR = Integer.MAX_VALUE;
private static final int SKIP_LF = Integer.MAX_VALUE - 1;
private boolean pushedBack;
private boolean forceLower;
/** The line number of the last token read */
private int lineno = 1;
private boolean eolIsSignificantP = false;
private boolean slashSlashCommentsP = false;
private boolean slashStarCommentsP = false;
// rlw
private char[] slashSlash = new char[] {'/','/'};
private char[] slashStar = new char[] {'/','*'};
private char[] starSlash = new char[] {'*','/'};
private byte ctype[] = new byte[256];
private static final byte CT_WHITESPACE = 1;
private static final byte CT_DIGIT = 2;
private static final byte CT_ALPHA = 4;
private static final byte CT_QUOTE = 8;
private static final byte CT_COMMENT = 16;
private boolean isParseHexNumbers = false;
private boolean isParseExponents = false;
/**
* After a call to the nextToken method, this field
* contains the type of the token just read. For a single character
* token, its value is the single character, converted to an integer.
* For a quoted string token (see , its value is the quote character.
* Otherwise, its value is one of the following:
*
* TT_WORD indicates that the token is a word.
* TT_NUMBER indicates that the token is a number.
* TT_EOL indicates that the end of line has been read.
* The field can only have this value if the
* eolIsSignificant method has been called with the
* argument true.
* TT_EOF indicates that the end of the input stream
* has been reached.
*
*
* @see java.io.StreamTokenizer#eolIsSignificant(boolean)
* @see java.io.StreamTokenizer#nextToken()
* @see java.io.StreamTokenizer#quoteChar(int)
* @see java.io.StreamTokenizer#TT_EOF
* @see java.io.StreamTokenizer#TT_EOL
* @see java.io.StreamTokenizer#TT_NUMBER
* @see java.io.StreamTokenizer#TT_WORD
*/
public int ttype = TT_NOTHING;
/**
* A constant indicating that the end of the stream has been read.
*/
public static final int TT_EOF = -1;
/**
* A constant indicating that the end of the line has been read.
*/
public static final int TT_EOL = '\n';
/**
* A constant indicating that a number token has been read.
*/
public static final int TT_NUMBER = -2;
/**
* A constant indicating that a word token has been read.
*/
public static final int TT_WORD = -3;
/* A constant indicating that no token has been read, used for
* initializing ttype. FIXME This could be made public and
* made available as the part of the API in a future release.
*/
private static final int TT_NOTHING = -4;
/**
* If the current token is a word token, this field contains a
* string giving the characters of the word token. When the current
* token is a quoted string token, this field contains the body of
* the string.
*
* The current token is a word when the value of the
* ttype field is TT_WORD. The current token is
* a quoted string token when the value of the ttype field is
* a quote character.
*
* @see java.io.StreamTokenizer#quoteChar(int)
* @see java.io.StreamTokenizer#TT_WORD
* @see java.io.StreamTokenizer#ttype
*/
public String sval;
/**
* If the current token is a number, this field contains the value
* of that number. The current token is a number when the value of
* the ttype field is TT_NUMBER.
*
* @see java.io.StreamTokenizer#TT_NUMBER
* @see java.io.StreamTokenizer#ttype
*/
public double nval;
/** Initializes everything except the streams. */
public StreamPosTokenizer() {
wordChars('a', 'z');
wordChars('A', 'Z');
wordChars(128 + 32, 255);
whitespaceChars(0, ' ');
commentChar('/');
quoteChar('"');
quoteChar('\'');
parseNumbers();
}
/**
* Create a tokenizer that parses the given character stream.
* @since JDK1.1
*/
public StreamPosTokenizer(Reader r) {
this();
if (r == null) {
throw new NullPointerException();
}
reader = r;
}
/**
* Sets the reader for the tokenizer.
*
* @param r
*/
public void setReader(Reader r) {
this.reader = r;
readpos = 0;
unread.clear();
peekc = NEED_CHAR;
pushedBack = false;
forceLower = false;
lineno = 0;
startpos = endpos = -1;
ttype = TT_NOTHING;
}
/**
* Resets this tokenizer's syntax table so that all characters are
* "ordinary." See the ordinaryChar method
* for more information on a character being ordinary.
*
* @see java.io.StreamTokenizer#ordinaryChar(int)
*/
public void resetSyntax() {
for (int i = ctype.length; --i >= 0;)
ctype[i] = 0;
}
/**
* Specifies that all characters c in the range
* low <= c <= high
* are word constituents. A word token consists of a word constituent
* followed by zero or more word constituents or number constituents.
*
* @param low the low end of the range.
* @param hi the high end of the range.
*/
public void wordChars(int low, int hi) {
if (low < 0)
low = 0;
if (hi >= ctype.length)
hi = ctype.length - 1;
while (low <= hi)
ctype[low++] |= CT_ALPHA;
}
/**
* Specifies that all characters c in the range
* low <= c <= high
* are white space characters. White space characters serve only to
* separate tokens in the input stream.
*
* @param low the low end of the range.
* @param hi the high end of the range.
*/
public void whitespaceChars(int low, int hi) {
if (low < 0)
low = 0;
if (hi >= ctype.length)
hi = ctype.length - 1;
while (low <= hi)
ctype[low++] = CT_WHITESPACE;
}
/**
* Specifies that all characters c in the range
* low <= c <= high
* are "ordinary" in this tokenizer. See the
* ordinaryChar method for more information on a
* character being ordinary.
*
* @param low the low end of the range.
* @param hi the high end of the range.
* @see java.io.StreamTokenizer#ordinaryChar(int)
*/
public void ordinaryChars(int low, int hi) {
if (low < 0)
low = 0;
if (hi >= ctype.length)
hi = ctype.length - 1;
while (low <= hi)
ctype[low++] = 0;
}
/**
* Specifies that the character argument is "ordinary"
* in this tokenizer. It removes any special significance the
* character has as a comment character, word component, string
* delimiter, white space, or number character. When such a character
* is encountered by the parser, the parser treates it as a
* single-character token and sets ttype field to the
* character value.
*
* @param ch the character.
* @see java.io.StreamTokenizer#ttype
*/
public void ordinaryChar(int ch) {
if (ch >= 0 && ch < ctype.length)
ctype[ch] = 0;
}
/**
* Specified that the character argument starts a single-line
* comment. All characters from the comment character to the end of
* the line are ignored by this stream tokenizer.
*
* @param ch the character.
*/
public void commentChar(int ch) {
if (ch >= 0 && ch < ctype.length)
ctype[ch] = CT_COMMENT;
}
/**
* Specifies that matching pairs of this character delimit string
* constants in this tokenizer.
*
* When the nextToken method encounters a string
* constant, the ttype field is set to the string
* delimiter and the sval field is set to the body of
* the string.
*
* If a string quote character is encountered, then a string is
* recognized, consisting of all characters after (but not including)
* the string quote character, up to (but not including) the next
* occurrence of that same string quote character, or a line
* terminator, or end of file. The usual escape sequences such as
* "\n" and "\t" are recognized and
* converted to single characters as the string is parsed.
*
* @param ch the character.
* @see java.io.StreamTokenizer#nextToken()
* @see java.io.StreamTokenizer#sval
* @see java.io.StreamTokenizer#ttype
*/
public void quoteChar(int ch) {
if (ch >= 0 && ch < ctype.length)
ctype[ch] = CT_QUOTE;
}
/**
* Specifies that numbers should be parsed by this tokenizer. The
* syntax table of this tokenizer is modified so that each of the twelve
* characters:
*
* 0 1 2 3 4 5 6 7 8 9 . -
*
*
* has the "numeric" attribute.
*
* When the parser encounters a word token that has the format of a
* double precision floating-point number, it treats the token as a
* number rather than a word, by setting the the ttype
* field to the value TT_NUMBER and putting the numeric
* value of the token into the nval field.
*
* @see java.io.StreamTokenizer#nval
* @see java.io.StreamTokenizer#TT_NUMBER
* @see java.io.StreamTokenizer#ttype
*/
public void parseNumbers() {
for (int i = '0'; i <= '9'; i++)
ctype[i] |= CT_DIGIT;
ctype['.'] |= CT_DIGIT;
ctype['-'] |= CT_DIGIT;
//ctype['+'] |= CT_DIGIT; // rlw
}
public void parsePlusAsNumber() {
ctype['+'] |= CT_DIGIT;
}
/**
* Enables number parsing for decimal numbers and for hexadecimal numbers
*/
public void parseHexNumbers() {
parseNumbers();
isParseHexNumbers = true;
}
/**
* Enables number parsing of exponents.
* Exponents appear after the last digit of number with capital letter 'E'
* or small letter 'e'.
*/
public void parseExponents() {
parseNumbers();
isParseExponents = true;
}
/**
* Determines whether or not ends of line are treated as tokens.
* If the flag argument is true, this tokenizer treats end of lines
* as tokens; the nextToken method returns
* TT_EOL and also sets the ttype field to
* this value when an end of line is read.
*
* A line is a sequence of characters ending with either a
* carriage-return character ('\r') or a newline
* character ('\n'). In addition, a carriage-return
* character followed immediately by a newline character is treated
* as a single end-of-line token.
*
* If the flag is false, end-of-line characters are
* treated as white space and serve only to separate tokens.
*
* @param flag true indicates that end-of-line characters
* are separate tokens; false indicates that
* end-of-line characters are white space.
* @see java.io.StreamTokenizer#nextToken()
* @see java.io.StreamTokenizer#ttype
* @see java.io.StreamTokenizer#TT_EOL
*/
public void eolIsSignificant(boolean flag) {
eolIsSignificantP = flag;
}
/**
* Determines whether or not the tokenizer recognizes C-style comments.
* If the flag argument is true, this stream tokenizer
* recognizes C-style comments. All text between successive
* occurrences of /* and */ are discarded.
*
* If the flag argument is false, then C-style comments
* are not treated specially.
*
* @param flag true indicates to recognize and ignore
* C-style comments.
*/
public void slashStarComments(boolean flag) {
slashStarCommentsP = flag;
}
/**
* Determines whether or not the tokenizer recognizes C++-style comments.
* If the flag argument is true, this stream tokenizer
* recognizes C++-style comments. Any occurrence of two consecutive
* slash characters ('/') is treated as the beginning of
* a comment that extends to the end of the line.
*
* If the flag argument is false, then C++-style
* comments are not treated specially.
*
* @param flag true indicates to recognize and ignore
* C++-style comments.
*/
public void slashSlashComments(boolean flag) {
slashSlashCommentsP = flag;
}
/**
* Determines whether or not word token are automatically lowercased.
* If the flag argument is true, then the value in the
* sval field is lowercased whenever a word token is
* returned (the ttype field has the
* value TT_WORD by the nextToken method
* of this tokenizer.
*
* If the flag argument is false, then the
* sval field is not modified.
*
* @param fl true indicates that all word tokens should
* be lowercased.
* @see java.io.StreamTokenizer#nextToken()
* @see java.io.StreamTokenizer#ttype
* @see java.io.StreamTokenizer#TT_WORD
*/
public void lowerCaseMode(boolean fl) {
forceLower = fl;
}
/** Read the next character */
private int read() throws IOException {
// rlw
int data;
if (unread.size() > 0) {
data = ((Integer) unread.lastElement()).intValue();
unread.removeElementAt(unread.size() - 1);
} else {
data = reader.read();
}
if (data != -1) { readpos++; }
return data;
}
/** Unread */
private void unread(int c) {
unread.addElement(c);
readpos--;
}
/**
* Parses the next token from the input stream of this tokenizer.
* The type of the next token is returned in the ttype
* field. Additional information about the token may be in the
* nval field or the sval field of this
* tokenizer.
*
* Typical clients of this
* class first set up the syntax tables and then sit in a loop
* calling nextToken to parse successive tokens until TT_EOF
* is returned.
*
* @return the value of the ttype field.
* @exception java.io.IOException if an I/O error occurs.
* @see java.io.StreamTokenizer#nval
* @see java.io.StreamTokenizer#sval
* @see java.io.StreamTokenizer#ttype
*/
@SuppressWarnings("empty-statement")
public int nextToken() throws IOException {
if (pushedBack) {
pushedBack = false;
return ttype;
}
byte ct[] = ctype;
sval = null;
int c = peekc;
if (c < 0)
c = NEED_CHAR;
if (c == SKIP_LF) {
c = read();
if (c < 0) {
// rlw
startpos = endpos = readpos - 1;
return ttype = TT_EOF;
}
if (c == '\n')
c = NEED_CHAR;
}
if (c == NEED_CHAR) {
c = read();
if (c < 0) {
// rlw
startpos = endpos = readpos - 1;
return ttype = TT_EOF;
}
}
ttype = c; /* Just to be safe */
/* Set peekc so that the next invocation of nextToken will read
* another character unless peekc is reset in this invocation
*/
peekc = NEED_CHAR;
int ctype = c < 256 ? ct[c] : CT_ALPHA;
while ((ctype & CT_WHITESPACE) != 0) {
if (c == '\r') {
lineno++;
if (eolIsSignificantP) {
peekc = SKIP_LF;
// rlw
startpos = endpos = readpos - 1;
return ttype = TT_EOL;
}
c = read();
if (c == '\n')
c = read();
} else {
if (c == '\n') {
lineno++;
if (eolIsSignificantP) {
// rlw
startpos = endpos = readpos - 1;
return ttype = TT_EOL;
}
}
c = read();
}
if (c < 0) {
// rlw
startpos = endpos = readpos;
return ttype = TT_EOF;
}
ctype = c < 256 ? ct[c] : CT_ALPHA;
}
// rlw
startpos = readpos - 1;
// rlw hexadecimal
hex: if (((ctype & CT_DIGIT) != 0) &&
c == '0' && isParseHexNumbers) {
c = read();
if (c == 'x') {
int digits = 0;
long hval = 0;
while (digits < 16) {
c = read();
if (c >= '0' && c <= '9') {
hval = (hval << 4) | (c - '0');
} else if (c >= 'A' && c <= 'F') {
hval = (hval << 4) | (c - 'A' + 10);
} else if (c >= 'a' && c <= 'f') {
hval = (hval << 4) | (c - 'a' + 10);
} else {
unread(c);
if (digits == 0) {
sval = "0x";
endpos = readpos - 1;
return ttype = TT_WORD;
} else {
nval = (double) hval;
endpos = readpos - 1;
return ttype = TT_NUMBER;
}
}
digits++;
}
nval = (double) hval;
endpos = readpos - 1;
return ttype = TT_NUMBER;
} else {
unread(c);
c = '0';
}
}
digit: if ((ctype & CT_DIGIT) != 0) {
int digits = 0;
boolean neg = false;
if (c == '-') {
c = read();
if (c != '.' && (c < '0' || c > '9')) {
peekc = c;
// rlw
if (('-' & CT_ALPHA) != 0) {
unread(c);
c = '-';
break digit;
} else {
endpos = readpos - 1;
return ttype = '-';
}
}
neg = true;
} else if (c == '+') {
c = read();
if (c != '.' && (c < '0' || c > '9')) {
peekc = c;
// rlw
if (('+' & CT_ALPHA) != 0) {
unread(c);
c = '+';
break digit;
} else {
endpos = readpos - 1;
return ttype = '-';
}
}
neg = false;
}
double v = 0;
int decexp = 0;
int seendot = 0;
while (true) {
if (c == '.' && seendot == 0)
seendot = 1;
else if ('0' <= c && c <= '9') {
digits++;
v = v * 10 + (c - '0');
decexp += seendot;
} else
break;
c = read();
}
peekc = c;
if (decexp != 0) {
double denom = 10;
decexp--;
while (decexp > 0) {
denom *= 10;
decexp--;
}
/* Do one division of a likely-to-be-more-accurate number */
v = v / denom;
}
nval = neg ? -v : v;
// rlw
endpos = (c == -1) ? readpos - 1 : readpos - 2;
if (digits == 0) {
if (('.' & CT_ALPHA) != 0) {
unread(c);
if (neg) {
unread('.');
c = '-';
} else {
read(); // consume full stop
c = '.';
}
break digit;
} else {
return ttype = '.';
}
} else {
if (isParseExponents) {
if (c == 'E' || c == 'e') {
c = read();
digits = 0;
neg = false;
if (c == '-') {
c = read();
if (c < '0' || c > '9') {
unread(c);
unread('E');
return ttype = TT_NUMBER;
}
neg = true;
}
v = 0;
decexp = 0;
while (true) {
if ('0' <= c && c <= '9') {
digits++;
v = v * 10 + (c - '0');
} else {
break;
}
c = read();
}
peekc = c;
nval *= Math.pow(10, (neg) ? -v : v);
}
}
return ttype = TT_NUMBER;
}
}
if ((ctype & CT_ALPHA) != 0) {
int i = 0;
do {
if (i >= buf.length) {
char nb[] = new char[buf.length * 2];
System.arraycopy(buf, 0, nb, 0, buf.length);
buf = nb;
}
buf[i++] = (char) c;
c = read();
ctype = c < 0 ? CT_WHITESPACE : c < 256 ? ct[c] : CT_ALPHA;
} while ((ctype & (CT_ALPHA | CT_DIGIT)) != 0);
peekc = c;
sval = String.copyValueOf(buf, 0, i);
if (forceLower)
sval = sval.toLowerCase();
// rlw EOF must be treated specially
endpos = (c == -1) ? readpos - 1 : readpos - 2;
return ttype = TT_WORD;
}
if ((ctype & CT_QUOTE) != 0) {
ttype = c;
int i = 0;
/* Invariants (because \Octal needs a lookahead):
* (i) c contains char value
* (ii) d contains the lookahead
*/
int d = read();
while (d >= 0 && d != ttype && d != '\n' && d != '\r') {
if (d == '\\') {
c = read();
int first = c; /* To allow \377, but not \477 */
if (c >= '0' && c <= '7') {
c = c - '0';
int c2 = read();
if ('0' <= c2 && c2 <= '7') {
c = (c << 3) + (c2 - '0');
c2 = read();
if ('0' <= c2 && c2 <= '7' && first <= '3') {
c = (c << 3) + (c2 - '0');
d = read();
} else
d = c2;
} else
d = c2;
} else {
switch (c) {
case 'a':
c = 0x7;
break;
case 'b':
c = '\b';
break;
case 'f':
c = 0xC;
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'v':
c = 0xB;
break;
}
d = read();
}
} else {
c = d;
d = read();
}
if (i >= buf.length) {
char nb[] = new char[buf.length * 2];
System.arraycopy(buf, 0, nb, 0, buf.length);
buf = nb;
}
buf[i++] = (char)c;
}
/* If we broke out of the loop because we found a matching quote
* character then arrange to read a new character next time
* around; otherwise, save the character.
*/
peekc = (d == ttype) ? NEED_CHAR : d;
sval = String.copyValueOf(buf, 0, i);
// rlw
endpos = readpos - 2;
return ttype;
}
/* rlw*/
/*
if (c == '/' && (slashSlashCommentsP || slashStarCommentsP)) {
c = read();
if (c == '*' && slashStarCommentsP) {
int prevc = 0;
while ((c = read()) != '/' || prevc != '*') {
if (c == '\r') {
lineno++;
c = read();
if (c == '\n') {
c = read();
}
} else {
if (c == '\n') {
lineno++;
c = read();
}
}
if (c < 0) {
endpos = readpos;
return ttype = TT_EOF;
}
prevc = c;
}
return nextToken();
} else if (c == '/' && slashSlashCommentsP) {
while ((c = read()) != '\n' && c != '\r' && c >= 0);
peekc = c;
return nextToken();
} else {
// Now see if it is still a single line comment
if ((ct['/'] & CT_COMMENT) != 0) {
while ((c = read()) != '\n' && c != '\r' && c >= 0);
peekc = c;
return nextToken();
} else {
peekc = c;
// rlw
endpos = readpos - 2;
return ttype = '/';
}
}
}*/
if (slashSlashCommentsP && c == slashSlash[0]
|| slashStarCommentsP && c == slashStar[0]) {
if (c == slashStar[0] && slashStar.length == 1) {
// This is the scanner code if the slashStar token
// is one characters long
while ((c = read()) != starSlash[0]) {
if (c == '\r') {
lineno++;
c = read();
if (c == '\n') {
c = read();
}
} else {
if (c == '\n') {
lineno++;
c = read();
}
}
if (c < 0) {
endpos = readpos;
return ttype = TT_EOF;
}
}
return nextToken();
} else if (c == slashSlash[0] && slashSlash.length == 1) {
// This is the scanner code if the slashSlash token
// is one characters long
while ((c = read()) != '\n' && c != '\r' && c >= 0);
peekc = c;
return nextToken();
} else {
// This is the scanner code if the slashStar and the slashSlash
// tokens are two characters long
c = read();
if (c == slashStar[1] && slashStarCommentsP) {
int prevc = 0;
while ((c = read()) != starSlash[1] || prevc != starSlash[0]) {
if (c == '\r') {
lineno++;
c = read();
if (c == '\n') {
c = read();
}
} else {
if (c == '\n') {
lineno++;
c = read();
}
}
if (c < 0) {
endpos = readpos;
return ttype = TT_EOF;
}
prevc = c;
}
return nextToken();
} else if (c == slashSlash[1] && slashSlashCommentsP) {
while ((c = read()) != '\n' && c != '\r' && c >= 0);
peekc = c;
return nextToken();
} else {
// Now see if it is still a single line comment
if ((ct[slashSlash[0]] & CT_COMMENT) != 0) {
while ((c = read()) != '\n' && c != '\r' && c >= 0);
peekc = c;
return nextToken();
} else {
peekc = c;
// rlw
endpos = readpos - 2;
return ttype = slashSlash[0];
}
}
}
}
if ((ctype & CT_COMMENT) != 0) {
while ((c = read()) != '\n' && c != '\r' && c >= 0);
peekc = c;
//lineno++; removed because it counts line break twice
return nextToken();
}
// rlw
endpos = readpos - 1;
return ttype = c;
}
/**
* Reads the next character from the input stream, without
* passing it to the tokenizer.
*/
public int nextChar() throws IOException {
if (pushedBack) {
throw new IllegalStateException("can't read char when a token has been pushed back");
}
if (peekc == NEED_CHAR) {
return read();
} else {
int ch = peekc;
peekc = NEED_CHAR;
return ch;
}
}
/**
* Unreads a character back into the input stream of the tokenizer.
*/
public void pushCharBack(int ch) throws IOException {
if (pushedBack) {
throw new IllegalStateException("can't push back char when a token has been pushed back");
}
if (peekc == NEED_CHAR) {
unread(ch);
} else {
unread(peekc);
peekc = NEED_CHAR;
unread(ch);
}
}
/**
* Sets the slash star and star slash tokens.
* Due to limitations by this implementation, both tokens must have the
* same number of characters and the character length must be either 1
* or 2.
*/
public void setSlashStarTokens(String slashStar, String starSlash) {
if (slashStar.length() != starSlash.length()) {
throw new IllegalArgumentException("SlashStar and StarSlash tokens must be of same length: '"+slashStar+"' '"+starSlash+"'");
}
if (slashStar.length() < 1 || slashStar.length() > 2) {
throw new IllegalArgumentException("SlashStar and StarSlash tokens must be of length 1 or 2: '"+slashStar+"' '"+starSlash+"'");
}
this.slashStar = slashStar.toCharArray();
this.starSlash = starSlash.toCharArray();
commentChar(this.slashStar[0]);
}
/**
* Sets the slash slash token.
* Due to limitations by this implementation, the character length must be
* either 1 or 2.
*/
public void setSlashSlashToken(String slashSlash) {
if (slashSlash.length() < 1 || slashSlash.length() > 2) {
throw new IllegalArgumentException("SlashSlash token must be of length 1 or 2: '"+slashSlash+"'");
}
this.slashSlash = slashSlash.toCharArray();
commentChar(this.slashSlash[0]);
}
/**
* Causes the next call to the nextToken method of this
* tokenizer to return the current value in the ttype
* field, and not to modify the value in the nval or
* sval field.
*
* @see java.io.StreamTokenizer#nextToken()
* @see java.io.StreamTokenizer#nval
* @see java.io.StreamTokenizer#sval
* @see java.io.StreamTokenizer#ttype
*/
public void pushBack() {
if (ttype != TT_NOTHING) /* No-op if nextToken() not called */
pushedBack = true;
}
/**
* Return the current line number.
*
* @return the current line number of this stream tokenizer.
*/
public int lineno() {
return lineno;
}
/**
* Returns the start position of the token relative
* to the position that the stream had, when the
* StreamPosTokenizer was constructed.
*
* @return the start position of the token.
*/
public int getStartPosition() {
return startpos;
}
/**
* Set the start position of the current token.
*/
public void setStartPosition(int p) {
startpos = p;
}
/**
* Returns the end position of the token relative
* to the position that the stream had, when the
* StreamPosTokenizer was constructed.
*
* @return the end position of the token.
*/
public int getEndPosition() {
return endpos;
}
/**
* Consumes a substring from the current sval of the StreamPosTokenizer.
*/
public void consumeGreedy(String greedyToken) {
if (greedyToken.length() < sval.length()) {
pushBack();
setStartPosition(getStartPosition() + greedyToken.length());
sval = sval.substring(greedyToken.length());
}
}
/**
* Returns the string representation of the current stream token.
*
* @return a string representation of the token specified by the
* ttype, nval, and sval
* fields.
* @see java.io.StreamTokenizer#nval
* @see java.io.StreamTokenizer#sval
* @see java.io.StreamTokenizer#ttype
*/
@Override
public String toString() {
String ret;
switch (ttype) {
case TT_EOF:
ret = "EOF";
break;
case TT_EOL:
ret = "EOL";
break;
case TT_WORD:
ret = sval;
break;
case TT_NUMBER:
ret = "n=" + nval;
break;
case TT_NOTHING:
ret = "NOTHING";
break;
default:{
char s[] = new char[3];
s[0] = s[2] = '\'';
s[1] = (char) ttype;
ret = new String(s);
break;
}
}
return "Token[" + ret + "], line " + lineno;
}
}