835 lines
29 KiB
Java
835 lines
29 KiB
Java
/*
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* Copyright (c) 1995, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.io;
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import java.util.Arrays;
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/**
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* The {@code StreamTokenizer} class takes an input stream and
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* parses it into "tokens", allowing the tokens to be
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* read one at a time. The parsing process is controlled by a table
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* and a number of flags that can be set to various states. The
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* stream tokenizer can recognize identifiers, numbers, quoted
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* strings, and various comment styles.
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* <p>
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* Each byte read from the input stream is regarded as a character
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* in the range {@code '\u005Cu0000'} through {@code '\u005Cu00FF'}.
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* The character value is used to look up five possible attributes of
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* the character: <i>white space</i>, <i>alphabetic</i>,
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* <i>numeric</i>, <i>string quote</i>, and <i>comment character</i>.
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* Each character can have zero or more of these attributes.
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* <p>
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* In addition, an instance has four flags. These flags indicate:
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* <ul>
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* <li>Whether line terminators are to be returned as tokens or treated
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* as white space that merely separates tokens.
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* <li>Whether C-style comments are to be recognized and skipped.
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* <li>Whether C++-style comments are to be recognized and skipped.
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* <li>Whether the characters of identifiers are converted to lowercase.
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* </ul>
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* <p>
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* A typical application first constructs an instance of this class,
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* sets up the syntax tables, and then repeatedly loops calling the
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* {@code nextToken} method in each iteration of the loop until
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* it returns the value {@code TT_EOF}.
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*
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* @author James Gosling
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* @see java.io.StreamTokenizer#nextToken()
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* @see java.io.StreamTokenizer#TT_EOF
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* @since 1.0
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*/
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public class StreamTokenizer {
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/* Only one of these will be non-null */
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private Reader reader = null;
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private InputStream input = null;
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private char buf[] = new char[20];
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/**
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* The next character to be considered by the nextToken method. May also
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* be NEED_CHAR to indicate that a new character should be read, or SKIP_LF
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* to indicate that a new character should be read and, if it is a '\n'
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* character, it should be discarded and a second new character should be
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* read.
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*/
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private int peekc = NEED_CHAR;
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private static final int NEED_CHAR = Integer.MAX_VALUE;
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private static final int SKIP_LF = Integer.MAX_VALUE - 1;
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private boolean pushedBack;
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private boolean forceLower;
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/** The line number of the last token read */
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private int LINENO = 1;
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private boolean eolIsSignificantP = false;
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private boolean slashSlashCommentsP = false;
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private boolean slashStarCommentsP = false;
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private byte ctype[] = new byte[256];
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private static final byte CT_WHITESPACE = 1;
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private static final byte CT_DIGIT = 2;
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private static final byte CT_ALPHA = 4;
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private static final byte CT_QUOTE = 8;
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private static final byte CT_COMMENT = 16;
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/**
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* After a call to the {@code nextToken} method, this field
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* contains the type of the token just read. For a single character
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* token, its value is the single character, converted to an integer.
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* For a quoted string token, its value is the quote character.
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* Otherwise, its value is one of the following:
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* <ul>
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* <li>{@code TT_WORD} indicates that the token is a word.
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* <li>{@code TT_NUMBER} indicates that the token is a number.
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* <li>{@code TT_EOL} indicates that the end of line has been read.
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* The field can only have this value if the
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* {@code eolIsSignificant} method has been called with the
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* argument {@code true}.
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* <li>{@code TT_EOF} indicates that the end of the input stream
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* has been reached.
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* </ul>
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* <p>
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* The initial value of this field is -4.
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*
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* @see java.io.StreamTokenizer#eolIsSignificant(boolean)
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* @see java.io.StreamTokenizer#nextToken()
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* @see java.io.StreamTokenizer#quoteChar(int)
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* @see java.io.StreamTokenizer#TT_EOF
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* @see java.io.StreamTokenizer#TT_EOL
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* @see java.io.StreamTokenizer#TT_NUMBER
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* @see java.io.StreamTokenizer#TT_WORD
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*/
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public int ttype = TT_NOTHING;
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/**
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* A constant indicating that the end of the stream has been read.
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*/
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public static final int TT_EOF = -1;
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/**
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* A constant indicating that the end of the line has been read.
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*/
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public static final int TT_EOL = '\n';
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/**
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* A constant indicating that a number token has been read.
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*/
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public static final int TT_NUMBER = -2;
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/**
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* A constant indicating that a word token has been read.
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*/
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public static final int TT_WORD = -3;
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/* A constant indicating that no token has been read, used for
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* initializing ttype. FIXME This could be made public and
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* made available as the part of the API in a future release.
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*/
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private static final int TT_NOTHING = -4;
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/**
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* If the current token is a word token, this field contains a
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* string giving the characters of the word token. When the current
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* token is a quoted string token, this field contains the body of
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* the string.
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* <p>
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* The current token is a word when the value of the
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* {@code ttype} field is {@code TT_WORD}. The current token is
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* a quoted string token when the value of the {@code ttype} field is
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* a quote character.
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* <p>
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* The initial value of this field is null.
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*
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* @see java.io.StreamTokenizer#quoteChar(int)
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* @see java.io.StreamTokenizer#TT_WORD
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* @see java.io.StreamTokenizer#ttype
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*/
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public String sval;
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/**
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* If the current token is a number, this field contains the value
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* of that number. The current token is a number when the value of
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* the {@code ttype} field is {@code TT_NUMBER}.
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* <p>
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* The initial value of this field is 0.0.
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*
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* @see java.io.StreamTokenizer#TT_NUMBER
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* @see java.io.StreamTokenizer#ttype
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*/
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public double nval;
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/** Private constructor that initializes everything except the streams. */
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private StreamTokenizer() {
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wordChars('a', 'z');
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wordChars('A', 'Z');
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wordChars(128 + 32, 255);
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whitespaceChars(0, ' ');
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commentChar('/');
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quoteChar('"');
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quoteChar('\'');
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parseNumbers();
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}
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/**
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* Creates a stream tokenizer that parses the specified input
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* stream. The stream tokenizer is initialized to the following
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* default state:
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* <ul>
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* <li>All byte values {@code 'A'} through {@code 'Z'},
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* {@code 'a'} through {@code 'z'}, and
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* {@code '\u005Cu00A0'} through {@code '\u005Cu00FF'} are
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* considered to be alphabetic.
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* <li>All byte values {@code '\u005Cu0000'} through
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* {@code '\u005Cu0020'} are considered to be white space.
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* <li>{@code '/'} is a comment character.
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* <li>Single quote {@code '\u005C''} and double quote {@code '"'}
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* are string quote characters.
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* <li>Numbers are parsed.
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* <li>Ends of lines are treated as white space, not as separate tokens.
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* <li>C-style and C++-style comments are not recognized.
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* </ul>
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*
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* @deprecated As of JDK version 1.1, the preferred way to tokenize an
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* input stream is to convert it into a character stream, for example:
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* <blockquote><pre>
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* Reader r = new BufferedReader(new InputStreamReader(is));
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* StreamTokenizer st = new StreamTokenizer(r);
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* </pre></blockquote>
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*
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* @param is an input stream.
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* @see java.io.BufferedReader
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* @see java.io.InputStreamReader
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* @see java.io.StreamTokenizer#StreamTokenizer(java.io.Reader)
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*/
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@Deprecated
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public StreamTokenizer(InputStream is) {
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this();
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if (is == null) {
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throw new NullPointerException();
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}
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input = is;
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}
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/**
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* Create a tokenizer that parses the given character stream.
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*
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* @param r a Reader object providing the input stream.
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* @since 1.1
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*/
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public StreamTokenizer(Reader r) {
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this();
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if (r == null) {
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throw new NullPointerException();
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}
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reader = r;
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}
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/**
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* Resets this tokenizer's syntax table so that all characters are
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* "ordinary." See the {@code ordinaryChar} method
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* for more information on a character being ordinary.
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*
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* @see java.io.StreamTokenizer#ordinaryChar(int)
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*/
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public void resetSyntax() {
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for (int i = ctype.length; --i >= 0;)
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ctype[i] = 0;
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}
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/**
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* Specifies that all characters <i>c</i> in the range
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* <code>low <= <i>c</i> <= high</code>
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* are word constituents. A word token consists of a word constituent
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* followed by zero or more word constituents or number constituents.
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*
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* @param low the low end of the range.
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* @param hi the high end of the range.
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*/
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public void wordChars(int low, int hi) {
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if (low < 0)
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low = 0;
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if (hi >= ctype.length)
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hi = ctype.length - 1;
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while (low <= hi)
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ctype[low++] |= CT_ALPHA;
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}
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/**
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* Specifies that all characters <i>c</i> in the range
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* <code>low <= <i>c</i> <= high</code>
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* are white space characters. White space characters serve only to
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* separate tokens in the input stream.
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*
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* <p>Any other attribute settings for the characters in the specified
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* range are cleared.
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*
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* @param low the low end of the range.
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* @param hi the high end of the range.
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*/
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public void whitespaceChars(int low, int hi) {
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if (low < 0)
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low = 0;
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if (hi >= ctype.length)
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hi = ctype.length - 1;
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while (low <= hi)
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ctype[low++] = CT_WHITESPACE;
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}
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/**
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* Specifies that all characters <i>c</i> in the range
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* <code>low <= <i>c</i> <= high</code>
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* are "ordinary" in this tokenizer. See the
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* {@code ordinaryChar} method for more information on a
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* character being ordinary.
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*
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* @param low the low end of the range.
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* @param hi the high end of the range.
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* @see java.io.StreamTokenizer#ordinaryChar(int)
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*/
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public void ordinaryChars(int low, int hi) {
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if (low < 0)
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low = 0;
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if (hi >= ctype.length)
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hi = ctype.length - 1;
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while (low <= hi)
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ctype[low++] = 0;
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}
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/**
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* Specifies that the character argument is "ordinary"
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* in this tokenizer. It removes any special significance the
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* character has as a comment character, word component, string
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* delimiter, white space, or number character. When such a character
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* is encountered by the parser, the parser treats it as a
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* single-character token and sets {@code ttype} field to the
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* character value.
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*
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* <p>Making a line terminator character "ordinary" may interfere
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* with the ability of a {@code StreamTokenizer} to count
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* lines. The {@code lineno} method may no longer reflect
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* the presence of such terminator characters in its line count.
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*
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* @param ch the character.
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* @see java.io.StreamTokenizer#ttype
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*/
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public void ordinaryChar(int ch) {
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if (ch >= 0 && ch < ctype.length)
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ctype[ch] = 0;
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}
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/**
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* Specified that the character argument starts a single-line
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* comment. All characters from the comment character to the end of
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* the line are ignored by this stream tokenizer.
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*
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* <p>Any other attribute settings for the specified character are cleared.
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*
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* @param ch the character.
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*/
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public void commentChar(int ch) {
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if (ch >= 0 && ch < ctype.length)
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ctype[ch] = CT_COMMENT;
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}
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/**
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* Specifies that matching pairs of this character delimit string
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* constants in this tokenizer.
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* <p>
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* When the {@code nextToken} method encounters a string
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* constant, the {@code ttype} field is set to the string
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* delimiter and the {@code sval} field is set to the body of
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* the string.
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* <p>
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* If a string quote character is encountered, then a string is
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* recognized, consisting of all characters after (but not including)
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* the string quote character, up to (but not including) the next
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* occurrence of that same string quote character, or a line
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* terminator, or end of file. The usual escape sequences such as
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* {@code "\u005Cn"} and {@code "\u005Ct"} are recognized and
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* converted to single characters as the string is parsed.
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*
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* <p>Any other attribute settings for the specified character are cleared.
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*
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* @param ch the character.
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* @see java.io.StreamTokenizer#nextToken()
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* @see java.io.StreamTokenizer#sval
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* @see java.io.StreamTokenizer#ttype
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*/
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public void quoteChar(int ch) {
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if (ch >= 0 && ch < ctype.length)
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ctype[ch] = CT_QUOTE;
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}
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/**
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* Specifies that numbers should be parsed by this tokenizer. The
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* syntax table of this tokenizer is modified so that each of the twelve
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* characters:
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* <blockquote><pre>
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* 0 1 2 3 4 5 6 7 8 9 . -
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* </pre></blockquote>
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* <p>
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* has the "numeric" attribute.
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* <p>
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* When the parser encounters a word token that has the format of a
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* double precision floating-point number, it treats the token as a
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* number rather than a word, by setting the {@code ttype}
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* field to the value {@code TT_NUMBER} and putting the numeric
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* value of the token into the {@code nval} field.
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*
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* @see java.io.StreamTokenizer#nval
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* @see java.io.StreamTokenizer#TT_NUMBER
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* @see java.io.StreamTokenizer#ttype
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*/
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public void parseNumbers() {
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for (int i = '0'; i <= '9'; i++)
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ctype[i] |= CT_DIGIT;
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ctype['.'] |= CT_DIGIT;
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ctype['-'] |= CT_DIGIT;
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}
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/**
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* Determines whether or not ends of line are treated as tokens.
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* If the flag argument is true, this tokenizer treats end of lines
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* as tokens; the {@code nextToken} method returns
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* {@code TT_EOL} and also sets the {@code ttype} field to
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* this value when an end of line is read.
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* <p>
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* A line is a sequence of characters ending with either a
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* carriage-return character ({@code '\u005Cr'}) or a newline
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* character ({@code '\u005Cn'}). In addition, a carriage-return
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* character followed immediately by a newline character is treated
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* as a single end-of-line token.
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* <p>
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* If the {@code flag} is false, end-of-line characters are
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* treated as white space and serve only to separate tokens.
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*
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* @param flag {@code true} indicates that end-of-line characters
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* are separate tokens; {@code false} indicates that
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* end-of-line characters are white space.
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* @see java.io.StreamTokenizer#nextToken()
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* @see java.io.StreamTokenizer#ttype
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* @see java.io.StreamTokenizer#TT_EOL
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*/
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public void eolIsSignificant(boolean flag) {
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eolIsSignificantP = flag;
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}
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|
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/**
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* Determines whether or not the tokenizer recognizes C-style comments.
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* If the flag argument is {@code true}, this stream tokenizer
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* recognizes C-style comments. All text between successive
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* occurrences of {@code /*} and <code>*/</code> are discarded.
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* <p>
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* If the flag argument is {@code false}, then C-style comments
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* are not treated specially.
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*
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* @param flag {@code true} indicates to recognize and ignore
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* C-style comments.
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*/
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public void slashStarComments(boolean flag) {
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slashStarCommentsP = flag;
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}
|
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|
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/**
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* Determines whether or not the tokenizer recognizes C++-style comments.
|
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* If the flag argument is {@code true}, this stream tokenizer
|
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* recognizes C++-style comments. Any occurrence of two consecutive
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* slash characters ({@code '/'}) is treated as the beginning of
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* a comment that extends to the end of the line.
|
|
* <p>
|
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* If the flag argument is {@code false}, then C++-style
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* comments are not treated specially.
|
|
*
|
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* @param flag {@code true} indicates to recognize and ignore
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* C++-style comments.
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*/
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public void slashSlashComments(boolean flag) {
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slashSlashCommentsP = flag;
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}
|
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|
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/**
|
|
* Determines whether or not word token are automatically lowercased.
|
|
* If the flag argument is {@code true}, then the value in the
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* {@code sval} field is lowercased whenever a word token is
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* returned (the {@code ttype} field has the
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* value {@code TT_WORD} by the {@code nextToken} method
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* of this tokenizer.
|
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* <p>
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* If the flag argument is {@code false}, then the
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* {@code sval} field is not modified.
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|
*
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|
* @param fl {@code true} indicates that all word tokens should
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* be lowercased.
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|
* @see java.io.StreamTokenizer#nextToken()
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* @see java.io.StreamTokenizer#ttype
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* @see java.io.StreamTokenizer#TT_WORD
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*/
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public void lowerCaseMode(boolean fl) {
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forceLower = fl;
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}
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|
|
|
/** Read the next character */
|
|
private int read() throws IOException {
|
|
if (reader != null)
|
|
return reader.read();
|
|
else if (input != null)
|
|
return input.read();
|
|
else
|
|
throw new IllegalStateException();
|
|
}
|
|
|
|
/**
|
|
* Parses the next token from the input stream of this tokenizer.
|
|
* The type of the next token is returned in the {@code ttype}
|
|
* field. Additional information about the token may be in the
|
|
* {@code nval} field or the {@code sval} field of this
|
|
* tokenizer.
|
|
* <p>
|
|
* 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 {@code ttype} field.
|
|
* @exception IOException if an I/O error occurs.
|
|
* @see java.io.StreamTokenizer#nval
|
|
* @see java.io.StreamTokenizer#sval
|
|
* @see java.io.StreamTokenizer#ttype
|
|
*/
|
|
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)
|
|
return ttype = TT_EOF;
|
|
if (c == '\n')
|
|
c = NEED_CHAR;
|
|
}
|
|
if (c == NEED_CHAR) {
|
|
c = read();
|
|
if (c < 0)
|
|
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;
|
|
return ttype = TT_EOL;
|
|
}
|
|
c = read();
|
|
if (c == '\n')
|
|
c = read();
|
|
} else {
|
|
if (c == '\n') {
|
|
LINENO++;
|
|
if (eolIsSignificantP) {
|
|
return ttype = TT_EOL;
|
|
}
|
|
}
|
|
c = read();
|
|
}
|
|
if (c < 0)
|
|
return ttype = TT_EOF;
|
|
ctype = c < 256 ? ct[c] : CT_ALPHA;
|
|
}
|
|
|
|
if ((ctype & CT_DIGIT) != 0) {
|
|
boolean neg = false;
|
|
if (c == '-') {
|
|
c = read();
|
|
if (c != '.' && (c < '0' || c > '9')) {
|
|
peekc = c;
|
|
return ttype = '-';
|
|
}
|
|
neg = true;
|
|
}
|
|
double v = 0;
|
|
int decexp = 0;
|
|
int seendot = 0;
|
|
while (true) {
|
|
if (c == '.' && seendot == 0)
|
|
seendot = 1;
|
|
else if ('0' <= c && c <= '9') {
|
|
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;
|
|
return ttype = TT_NUMBER;
|
|
}
|
|
|
|
if ((ctype & CT_ALPHA) != 0) {
|
|
int i = 0;
|
|
do {
|
|
if (i >= buf.length) {
|
|
buf = Arrays.copyOf(buf, buf.length * 2);
|
|
}
|
|
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();
|
|
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) {
|
|
buf = Arrays.copyOf(buf, buf.length * 2);
|
|
}
|
|
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);
|
|
return ttype;
|
|
}
|
|
|
|
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)
|
|
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;
|
|
return ttype = '/';
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((ctype & CT_COMMENT) != 0) {
|
|
while ((c = read()) != '\n' && c != '\r' && c >= 0);
|
|
peekc = c;
|
|
return nextToken();
|
|
}
|
|
|
|
return ttype = c;
|
|
}
|
|
|
|
/**
|
|
* Causes the next call to the {@code nextToken} method of this
|
|
* tokenizer to return the current value in the {@code ttype}
|
|
* field, and not to modify the value in the {@code nval} or
|
|
* {@code 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 string representation of the current stream token and
|
|
* the line number it occurs on.
|
|
*
|
|
* <p>The precise string returned is unspecified, although the following
|
|
* example can be considered typical:
|
|
*
|
|
* <blockquote><pre>Token['a'], line 10</pre></blockquote>
|
|
*
|
|
* @return a string representation of the token
|
|
* @see java.io.StreamTokenizer#nval
|
|
* @see java.io.StreamTokenizer#sval
|
|
* @see java.io.StreamTokenizer#ttype
|
|
*/
|
|
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: {
|
|
/*
|
|
* ttype is the first character of either a quoted string or
|
|
* is an ordinary character. ttype can definitely not be less
|
|
* than 0, since those are reserved values used in the previous
|
|
* case statements
|
|
*/
|
|
if (ttype < 256 &&
|
|
((ctype[ttype] & CT_QUOTE) != 0)) {
|
|
ret = sval;
|
|
break;
|
|
}
|
|
|
|
char s[] = new char[3];
|
|
s[0] = s[2] = '\'';
|
|
s[1] = (char) ttype;
|
|
ret = new String(s);
|
|
break;
|
|
}
|
|
}
|
|
return "Token[" + ret + "], line " + LINENO;
|
|
}
|
|
|
|
}
|