| /* |
| * Copyright (c) 1995, 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.io; |
| |
| import java.util.Arrays; |
| |
| /** |
| * The <code>StreamTokenizer</code> class takes an input stream and |
| * parses it into "tokens", allowing the tokens to be |
| * read one at a time. The parsing process is controlled by a table |
| * and a number of flags that can be set to various states. The |
| * stream tokenizer can recognize identifiers, numbers, quoted |
| * strings, and various comment styles. |
| * <p> |
| * Each byte read from the input stream is regarded as a character |
| * in the range <code>'\u0000'</code> through <code>'\u00FF'</code>. |
| * The character value is used to look up five possible attributes of |
| * the character: <i>white space</i>, <i>alphabetic</i>, |
| * <i>numeric</i>, <i>string quote</i>, and <i>comment character</i>. |
| * Each character can have zero or more of these attributes. |
| * <p> |
| * In addition, an instance has four flags. These flags indicate: |
| * <ul> |
| * <li>Whether line terminators are to be returned as tokens or treated |
| * as white space that merely separates tokens. |
| * <li>Whether C-style comments are to be recognized and skipped. |
| * <li>Whether C++-style comments are to be recognized and skipped. |
| * <li>Whether the characters of identifiers are converted to lowercase. |
| * </ul> |
| * <p> |
| * A typical application first constructs an instance of this class, |
| * sets up the syntax tables, and then repeatedly loops calling the |
| * <code>nextToken</code> method in each iteration of the loop until |
| * it returns the value <code>TT_EOF</code>. |
| * |
| * @author James Gosling |
| * @see java.io.StreamTokenizer#nextToken() |
| * @see java.io.StreamTokenizer#TT_EOF |
| * @since JDK1.0 |
| */ |
| |
| public class StreamTokenizer { |
| |
| /* Only one of these will be non-null */ |
| private Reader reader = null; |
| private InputStream input = null; |
| |
| 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; |
| |
| 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; |
| |
| /** |
| * After a call to the <code>nextToken</code> 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, its value is the quote character. |
| * Otherwise, its value is one of the following: |
| * <ul> |
| * <li><code>TT_WORD</code> indicates that the token is a word. |
| * <li><code>TT_NUMBER</code> indicates that the token is a number. |
| * <li><code>TT_EOL</code> indicates that the end of line has been read. |
| * The field can only have this value if the |
| * <code>eolIsSignificant</code> method has been called with the |
| * argument <code>true</code>. |
| * <li><code>TT_EOF</code> indicates that the end of the input stream |
| * has been reached. |
| * </ul> |
| * <p> |
| * The initial value of this field is -4. |
| * |
| * @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. |
| * <p> |
| * The current token is a word when the value of the |
| * <code>ttype</code> field is <code>TT_WORD</code>. The current token is |
| * a quoted string token when the value of the <code>ttype</code> field is |
| * a quote character. |
| * <p> |
| * The initial value of this field is null. |
| * |
| * @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 <code>ttype</code> field is <code>TT_NUMBER</code>. |
| * <p> |
| * The initial value of this field is 0.0. |
| * |
| * @see java.io.StreamTokenizer#TT_NUMBER |
| * @see java.io.StreamTokenizer#ttype |
| */ |
| public double nval; |
| |
| /** Private constructor that initializes everything except the streams. */ |
| private StreamTokenizer() { |
| wordChars('a', 'z'); |
| wordChars('A', 'Z'); |
| wordChars(128 + 32, 255); |
| whitespaceChars(0, ' '); |
| commentChar('/'); |
| quoteChar('"'); |
| quoteChar('\''); |
| parseNumbers(); |
| } |
| |
| /** |
| * Creates a stream tokenizer that parses the specified input |
| * stream. The stream tokenizer is initialized to the following |
| * default state: |
| * <ul> |
| * <li>All byte values <code>'A'</code> through <code>'Z'</code>, |
| * <code>'a'</code> through <code>'z'</code>, and |
| * <code>'\u00A0'</code> through <code>'\u00FF'</code> are |
| * considered to be alphabetic. |
| * <li>All byte values <code>'\u0000'</code> through |
| * <code>'\u0020'</code> are considered to be white space. |
| * <li><code>'/'</code> is a comment character. |
| * <li>Single quote <code>'\''</code> and double quote <code>'"'</code> |
| * are string quote characters. |
| * <li>Numbers are parsed. |
| * <li>Ends of lines are treated as white space, not as separate tokens. |
| * <li>C-style and C++-style comments are not recognized. |
| * </ul> |
| * |
| * @deprecated As of JDK version 1.1, the preferred way to tokenize an |
| * input stream is to convert it into a character stream, for example: |
| * <blockquote><pre> |
| * Reader r = new BufferedReader(new InputStreamReader(is)); |
| * StreamTokenizer st = new StreamTokenizer(r); |
| * </pre></blockquote> |
| * |
| * @param is an input stream. |
| * @see java.io.BufferedReader |
| * @see java.io.InputStreamReader |
| * @see java.io.StreamTokenizer#StreamTokenizer(java.io.Reader) |
| */ |
| @Deprecated |
| public StreamTokenizer(InputStream is) { |
| this(); |
| if (is == null) { |
| throw new NullPointerException(); |
| } |
| input = is; |
| } |
| |
| /** |
| * Create a tokenizer that parses the given character stream. |
| * |
| * @param r a Reader object providing the input stream. |
| * @since JDK1.1 |
| */ |
| public StreamTokenizer(Reader r) { |
| this(); |
| if (r == null) { |
| throw new NullPointerException(); |
| } |
| reader = r; |
| } |
| |
| /** |
| * Resets this tokenizer's syntax table so that all characters are |
| * "ordinary." See the <code>ordinaryChar</code> 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 <i>c</i> in the range |
| * <code>low <= <i>c</i> <= high</code> |
| * 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 <i>c</i> in the range |
| * <code>low <= <i>c</i> <= high</code> |
| * are white space characters. White space characters serve only to |
| * separate tokens in the input stream. |
| * |
| * <p>Any other attribute settings for the characters in the specified |
| * range are cleared. |
| * |
| * @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 <i>c</i> in the range |
| * <code>low <= <i>c</i> <= high</code> |
| * are "ordinary" in this tokenizer. See the |
| * <code>ordinaryChar</code> 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 treats it as a |
| * single-character token and sets <code>ttype</code> field to the |
| * character value. |
| * |
| * <p>Making a line terminator character "ordinary" may interfere |
| * with the ability of a <code>StreamTokenizer</code> to count |
| * lines. The <code>lineno</code> method may no longer reflect |
| * the presence of such terminator characters in its line count. |
| * |
| * @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. |
| * |
| * <p>Any other attribute settings for the specified character are cleared. |
| * |
| * @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. |
| * <p> |
| * When the <code>nextToken</code> method encounters a string |
| * constant, the <code>ttype</code> field is set to the string |
| * delimiter and the <code>sval</code> field is set to the body of |
| * the string. |
| * <p> |
| * 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 |
| * <code>"\n"</code> and <code>"\t"</code> are recognized and |
| * converted to single characters as the string is parsed. |
| * |
| * <p>Any other attribute settings for the specified character are cleared. |
| * |
| * @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: |
| * <blockquote><pre> |
| * 0 1 2 3 4 5 6 7 8 9 . - |
| * </pre></blockquote> |
| * <p> |
| * has the "numeric" attribute. |
| * <p> |
| * 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 <code>ttype</code> |
| * field to the value <code>TT_NUMBER</code> and putting the numeric |
| * value of the token into the <code>nval</code> 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; |
| } |
| |
| /** |
| * 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 <code>nextToken</code> method returns |
| * <code>TT_EOL</code> and also sets the <code>ttype</code> field to |
| * this value when an end of line is read. |
| * <p> |
| * A line is a sequence of characters ending with either a |
| * carriage-return character (<code>'\r'</code>) or a newline |
| * character (<code>'\n'</code>). In addition, a carriage-return |
| * character followed immediately by a newline character is treated |
| * as a single end-of-line token. |
| * <p> |
| * If the <code>flag</code> is false, end-of-line characters are |
| * treated as white space and serve only to separate tokens. |
| * |
| * @param flag <code>true</code> indicates that end-of-line characters |
| * are separate tokens; <code>false</code> 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 <code>true</code>, this stream tokenizer |
| * recognizes C-style comments. All text between successive |
| * occurrences of <code>/*</code> and <code>*/</code> are discarded. |
| * <p> |
| * If the flag argument is <code>false</code>, then C-style comments |
| * are not treated specially. |
| * |
| * @param flag <code>true</code> 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 <code>true</code>, this stream tokenizer |
| * recognizes C++-style comments. Any occurrence of two consecutive |
| * slash characters (<code>'/'</code>) is treated as the beginning of |
| * a comment that extends to the end of the line. |
| * <p> |
| * If the flag argument is <code>false</code>, then C++-style |
| * comments are not treated specially. |
| * |
| * @param flag <code>true</code> 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 <code>true</code>, then the value in the |
| * <code>sval</code> field is lowercased whenever a word token is |
| * returned (the <code>ttype</code> field has the |
| * value <code>TT_WORD</code> by the <code>nextToken</code> method |
| * of this tokenizer. |
| * <p> |
| * If the flag argument is <code>false</code>, then the |
| * <code>sval</code> field is not modified. |
| * |
| * @param fl <code>true</code> 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 { |
| 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</code> |
| * field. Additional information about the token may be in the |
| * <code>nval</code> field or the <code>sval</code> 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</code> 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</code> method of this |
| * tokenizer to return the current value in the <code>ttype</code> |
| * field, and not to modify the value in the <code>nval</code> or |
| * <code>sval</code> 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; |
| } |
| |
| } |
