mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-25 16:59:41 +08:00
448 lines
9.3 KiB
Java
448 lines
9.3 KiB
Java
/* Copyright (C) 1998, 1999 Red Hat, Inc.
|
|
|
|
This file is part of libgcj.
|
|
|
|
This software is copyrighted work licensed under the terms of the
|
|
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
|
|
details. */
|
|
|
|
package java.io;
|
|
|
|
/**
|
|
* @author Warren Levy <warrenl@cygnus.com>
|
|
* @date October 25, 1998.
|
|
*/
|
|
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
|
|
* "The Java Language Specification", ISBN 0-201-63451-1
|
|
* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
|
|
* Status: Believed complete and correct.
|
|
*/
|
|
|
|
public class StreamTokenizer
|
|
{
|
|
/* 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;
|
|
|
|
/* Contains the type of the token read resulting from a call to nextToken. */
|
|
public int ttype;
|
|
|
|
/* The String associated with word and string tokens. */
|
|
public String sval;
|
|
|
|
/* The numeric value associated with number tokens. */
|
|
public double nval;
|
|
|
|
/* Indicates whether end-of-line is recognized as a token. */
|
|
private boolean eolSignificant = false;
|
|
|
|
/* Indicates whether word tokens are automatically made lower case. */
|
|
private boolean lowerCase = false;
|
|
|
|
/* Indicates whether C++ style comments are recognized and skipped. */
|
|
private boolean slashSlash = false;
|
|
|
|
/* Indicates whether C style comments are recognized and skipped. */
|
|
private boolean slashStar = false;
|
|
|
|
/* Attribute tables of each byte from 0x00 to 0xFF. */
|
|
private boolean[] whitespace;
|
|
private boolean[] alphabetic;
|
|
private boolean[] numeric;
|
|
private boolean[] quote;
|
|
private boolean[] comment;
|
|
|
|
/* The Reader associated with this class. */
|
|
private PushbackReader in;
|
|
|
|
/* Indicates if a token has been pushed back. */
|
|
private boolean pushedBack = false;
|
|
|
|
/* Contains the current line number of the reader. */
|
|
private int lineNumber = 1;
|
|
|
|
// Deprecated in JDK 1.1.
|
|
public StreamTokenizer(InputStream is)
|
|
{
|
|
this(new InputStreamReader(is));
|
|
}
|
|
|
|
public StreamTokenizer(Reader r)
|
|
{
|
|
in = new PushbackReader(r);
|
|
|
|
whitespace = new boolean[256];
|
|
alphabetic = new boolean[256];
|
|
numeric = new boolean[256];
|
|
quote = new boolean[256];
|
|
comment = new boolean[256];
|
|
for (int i = 0; i < 256; i++)
|
|
resetChar(i);
|
|
|
|
whitespaceChars(0x00, 0x20);
|
|
wordChars('A', 'Z');
|
|
wordChars('a', 'z');
|
|
wordChars(0xA0, 0xFF);
|
|
commentChar('/');
|
|
quoteChar('\'');
|
|
quoteChar('"');
|
|
parseNumbers();
|
|
}
|
|
|
|
public void commentChar(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
comment[ch] = true;
|
|
}
|
|
|
|
public void eolIsSignificant(boolean flag)
|
|
{
|
|
eolSignificant = flag;
|
|
}
|
|
|
|
public int lineno()
|
|
{
|
|
return lineNumber;
|
|
}
|
|
|
|
public void lowerCaseMode(boolean flag)
|
|
{
|
|
lowerCase = flag;
|
|
}
|
|
|
|
private boolean isWhitespace(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
return whitespace[ch];
|
|
|
|
return false;
|
|
}
|
|
|
|
private boolean isAlphabetic(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
return alphabetic[ch];
|
|
else if (ch > 255)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
private boolean isNumeric(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
return numeric[ch];
|
|
|
|
return false;
|
|
}
|
|
|
|
private boolean isQuote(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
return quote[ch];
|
|
|
|
return false;
|
|
}
|
|
|
|
private boolean isComment(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
return comment[ch];
|
|
|
|
return false;
|
|
}
|
|
|
|
public int nextToken() throws IOException
|
|
{
|
|
if (pushedBack)
|
|
{
|
|
pushedBack = false;
|
|
return ttype;
|
|
}
|
|
|
|
sval = null;
|
|
int ch;
|
|
|
|
// Skip whitespace. Deal with EOL along the way.
|
|
while (isWhitespace(ch = in.read()))
|
|
if (ch == '\n' || ch == '\r')
|
|
{
|
|
lineNumber++;
|
|
|
|
// Throw away \n if in combination with \r.
|
|
if (ch == '\r' && (ch = in.read()) != '\n')
|
|
{
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
}
|
|
if (eolSignificant)
|
|
return (ttype = TT_EOL);
|
|
}
|
|
|
|
if (ch == TT_EOF)
|
|
ttype = TT_EOF;
|
|
else if (isNumeric(ch))
|
|
{
|
|
if (ch == '-')
|
|
{
|
|
// Read ahead to see if this is an ordinary '-' rather than numeric.
|
|
ch = in.read();
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
if (isNumeric(ch) && ch != '-')
|
|
ch = '-';
|
|
else
|
|
return (ttype = '-');
|
|
}
|
|
|
|
StringBuffer tokbuf = new StringBuffer();
|
|
tokbuf.append((char) ch);
|
|
|
|
int decCount = 0;
|
|
while (isNumeric(ch = in.read()) && ch != '-')
|
|
if (ch == '.' && decCount++ > 0)
|
|
break;
|
|
else
|
|
tokbuf.append((char) ch);
|
|
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
ttype = TT_NUMBER;
|
|
nval = Double.valueOf(tokbuf.toString()).doubleValue();
|
|
}
|
|
else if (isAlphabetic(ch))
|
|
{
|
|
StringBuffer tokbuf = new StringBuffer();
|
|
tokbuf.append((char) ch);
|
|
while (isAlphabetic(ch = in.read()) || isNumeric(ch))
|
|
tokbuf.append((char) ch);
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
ttype = TT_WORD;
|
|
sval = tokbuf.toString();
|
|
if (lowerCase)
|
|
sval.toLowerCase();
|
|
}
|
|
else if (isComment(ch))
|
|
{
|
|
while ((ch = in.read()) != '\n' && ch != '\r' && ch != TT_EOF)
|
|
;
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
return nextToken(); // Recursive, but not too deep in normal cases.
|
|
}
|
|
else if (isQuote(ch))
|
|
{
|
|
ttype = ch;
|
|
StringBuffer tokbuf = new StringBuffer();
|
|
while ((ch = in.read()) != ttype && ch != '\n' && ch != '\r' &&
|
|
ch != TT_EOF)
|
|
{
|
|
if (ch == '\\')
|
|
switch (ch = in.read())
|
|
{
|
|
case 'a': ch = 0x7;
|
|
break;
|
|
case 'b': ch = '\b';
|
|
break;
|
|
case 'f': ch = 0xC;
|
|
break;
|
|
case 'n': ch = '\n';
|
|
break;
|
|
case 'r': ch = '\r';
|
|
break;
|
|
case 't': ch = '\t';
|
|
break;
|
|
case 'v': ch = 0xB;
|
|
break;
|
|
case '\"':
|
|
case '\'':
|
|
case '\\':
|
|
break;
|
|
default:
|
|
int ch1, nextch;
|
|
if ((nextch = ch1 = ch) >= '0' && ch <= '7')
|
|
{
|
|
ch -= '0';
|
|
if ((nextch = in.read()) >= '0' && nextch <= '7')
|
|
{
|
|
ch = ch * 8 + nextch - '0';
|
|
if ((nextch = in.read()) >= '0' && nextch <= '7' &&
|
|
ch1 >= '0' && ch1 <= '3')
|
|
{
|
|
ch = ch * 8 + nextch - '0';
|
|
nextch = in.read();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (nextch != TT_EOF)
|
|
in.unread(nextch);
|
|
}
|
|
|
|
tokbuf.append((char) ch);
|
|
}
|
|
|
|
// Throw away matching quote char.
|
|
if (ch != ttype && ch != TT_EOF)
|
|
in.unread(ch);
|
|
|
|
sval = tokbuf.toString();
|
|
}
|
|
else
|
|
{
|
|
if (ch == '/')
|
|
if ((ch = in.read()) == '/' && slashSlash)
|
|
{
|
|
while ((ch = in.read()) != '\n' && ch != '\r' && ch != TT_EOF)
|
|
;
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
return nextToken(); // Recursive, but not too deep in normal cases
|
|
}
|
|
else if (ch == '*' && slashStar)
|
|
{
|
|
while (true)
|
|
{
|
|
ch = in.read();
|
|
if (ch == '*')
|
|
{
|
|
if ((ch = in.read()) == '/')
|
|
break;
|
|
else if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
}
|
|
else if (ch == '\n' || ch == '\r')
|
|
{
|
|
lineNumber++;
|
|
if (ch == '\r' && (ch = in.read()) != '\n')
|
|
{
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
}
|
|
}
|
|
else if (ch == TT_EOF)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
return nextToken(); // Recursive, but not too deep in normal cases
|
|
}
|
|
else
|
|
{
|
|
if (ch != TT_EOF)
|
|
in.unread(ch);
|
|
ch = '/';
|
|
}
|
|
|
|
ttype = ch;
|
|
}
|
|
|
|
return ttype;
|
|
}
|
|
|
|
private void resetChar(int ch)
|
|
{
|
|
whitespace[ch] = alphabetic[ch] = numeric[ch] = quote[ch] = comment[ch] =
|
|
false;
|
|
}
|
|
|
|
public void ordinaryChar(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
resetChar(ch);
|
|
}
|
|
|
|
public void ordinaryChars(int low, int hi)
|
|
{
|
|
if (low < 0)
|
|
low = 0;
|
|
if (hi > 255)
|
|
hi = 255;
|
|
for (int i = low; i <= hi; i++)
|
|
resetChar(i);
|
|
}
|
|
|
|
public void parseNumbers()
|
|
{
|
|
for (int i = 0; i <= 9; i++)
|
|
numeric['0' + i] = true;
|
|
|
|
numeric['.'] = true;
|
|
numeric['-'] = true;
|
|
}
|
|
|
|
public void pushBack()
|
|
{
|
|
// pushBack may cause the lineno method to return an incorrect value
|
|
// if lineno is called before the next call to nextToken.
|
|
pushedBack = true;
|
|
}
|
|
|
|
public void quoteChar(int ch)
|
|
{
|
|
if (ch >= 0 && ch <= 255)
|
|
quote[ch] = true;
|
|
}
|
|
|
|
public void resetSyntax()
|
|
{
|
|
ordinaryChars(0x00, 0xFF);
|
|
}
|
|
|
|
public void slashSlashComments(boolean flag)
|
|
{
|
|
slashSlash = flag;
|
|
}
|
|
|
|
public void slashStarComments(boolean flag)
|
|
{
|
|
slashStar = flag;
|
|
}
|
|
|
|
public String toString()
|
|
{
|
|
String tempstr;
|
|
if (ttype == TT_EOF)
|
|
tempstr = "EOF";
|
|
else if (ttype == TT_EOL)
|
|
tempstr = "EOL";
|
|
else if (ttype == TT_WORD)
|
|
tempstr = sval;
|
|
else if (ttype == TT_NUMBER)
|
|
tempstr = "n=" + Double.toString(nval);
|
|
else // must be an ordinary char.
|
|
tempstr = "\'" + (new Character((char) ttype)).toString() + "\'";
|
|
|
|
return "Token[" + tempstr + "], line " + Integer.toString(lineno());
|
|
}
|
|
|
|
public void whitespaceChars(int low, int hi)
|
|
{
|
|
if (low < 0)
|
|
low = 0;
|
|
if (hi > 255)
|
|
hi = 255;
|
|
for (int i = low; i <= hi; i++)
|
|
whitespace[i] = true;
|
|
}
|
|
|
|
public void wordChars(int low, int hi)
|
|
{
|
|
if (low < 0)
|
|
low = 0;
|
|
if (hi > 255)
|
|
hi = 255;
|
|
for (int i = low; i <= hi; i++)
|
|
alphabetic[i] = true;
|
|
}
|
|
}
|