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287 lines
8.0 KiB
Java
287 lines
8.0 KiB
Java
// Character.java - Character class.
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/* Copyright (C) 1998, 1999 Red Hat, Inc.
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.lang;
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import java.io.Serializable;
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/**
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* @author Tom Tromey <tromey@cygnus.com>
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* @date September 10, 1998
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*/
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1,
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* online API docs for JDK 1.2 beta from http://www.javasoft.com,
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* and The Unicode Standard Version 2.0.
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* Status: Believed complete and correct for JDK 1.1; 1.2 methods
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* unimplemented.
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*/
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public final class Character implements Serializable, Comparable
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{
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public static final char MIN_VALUE = '\u0000';
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public static final char MAX_VALUE = '\uffff';
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public static final int MIN_RADIX = 2;
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public static final int MAX_RADIX = 36;
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// This initialization is seemingly circular, but it is accepted
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// by javac, and is handled specially by gcc.
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public static final Class TYPE = char.class;
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// Space.
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public static final byte SPACE_SEPARATOR = 12;
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public static final byte LINE_SEPARATOR = 13;
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public static final byte PARAGRAPH_SEPARATOR = 14;
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// Letters.
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public static final byte UPPERCASE_LETTER = 1;
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public static final byte LOWERCASE_LETTER = 2;
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public static final byte TITLECASE_LETTER = 3;
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public static final byte MODIFIER_LETTER = 4;
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public static final byte OTHER_LETTER = 5;
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// Numbers.
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public static final byte DECIMAL_DIGIT_NUMBER = 9;
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public static final byte LETTER_NUMBER = 10;
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public static final byte OTHER_NUMBER = 11;
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// Marks.
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public static final byte NON_SPACING_MARK = 6;
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public static final byte ENCLOSING_MARK = 7;
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public static final byte COMBINING_SPACING_MARK = 8;
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// Punctuation.
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public static final byte DASH_PUNCTUATION = 20;
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public static final byte START_PUNCTUATION = 21;
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public static final byte END_PUNCTUATION = 22;
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public static final byte CONNECTOR_PUNCTUATION = 23;
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public static final byte OTHER_PUNCTUATION = 24;
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// Symbols.
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public static final byte MATH_SYMBOL = 25;
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public static final byte CURRENCY_SYMBOL = 26;
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public static final byte MODIFIER_SYMBOL = 27;
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public static final byte OTHER_SYMBOL = 28;
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// Format controls.
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public static final byte CONTROL = 15;
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// Note: The JCL book says that both FORMAT and PRIVATE_USE are 18.
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// However, FORMAT is actually 16.
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public static final byte FORMAT = 16;
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// Others.
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public static final byte UNASSIGNED = 0;
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public static final byte PRIVATE_USE = 18;
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public static final byte SURROGATE = 19;
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public Character (char ch)
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{
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value = ch;
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}
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public char charValue ()
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{
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return value;
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}
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// See if a character is a digit. If so, return the corresponding
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// value. Otherwise return -1.
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private static native int digit_value (char ch);
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public static int digit (char ch, int radix)
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{
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if (radix < MIN_RADIX || radix > MAX_RADIX)
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return -1;
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int d = digit_value (ch);
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if (d == -1)
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{
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if (ch >= 'A' && ch <= 'Z')
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d = ch - 'A' + 10;
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else if (ch >= 'a' && ch <= 'z')
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d = ch - 'a' + 10;
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else
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return -1;
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}
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return d >= radix ? -1 : d;
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}
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public boolean equals (Object obj)
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{
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// Don't need to compare OBJ to null as instanceof will do this.
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if (obj instanceof Character)
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return value == ((Character) obj).value;
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return false;
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}
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public static char forDigit (int d, int rdx)
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{
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if (d < 0 || d >= rdx || rdx < MIN_RADIX || rdx > MAX_RADIX)
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return '\u0000';
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if (d < 10)
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return (char) ('0' + d);
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// The Java Language Spec says to use lowercase, while the JCL
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// says to use uppercase. We go with the former.
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return (char) ('a' + d - 10);
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}
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public static native int getNumericValue (char ch);
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public static native int getType (char ch);
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public int hashCode ()
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{
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return value;
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}
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public static boolean isDefined (char ch)
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{
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return getType (ch) != UNASSIGNED;
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}
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public static boolean isDigit (char ch)
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{
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return digit_value (ch) != -1;
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}
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// The JCL book says that the argument here is a Character. That is
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// wrong.
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public static boolean isIdentifierIgnorable (char ch)
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{
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// This information comes from the Unicode Standard. It isn't
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// auto-generated as it doesn't appear in the unidata table.
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return ((ch >= '\u0000' && ch <= '\u0008')
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|| (ch >= '\u000e' && ch <= '\u001b')
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// JDK 1.2 docs say that these are ignorable. The Unicode
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// Standard is somewhat ambiguous on this issue.
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|| (ch >= '\u007f' && ch <= '\u009f')
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|| (ch >= '\u200c' && ch <= '\u200f')
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// JCl says 200a through 200e, but that is a typo. The
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// Unicode standard says the bidi controls are 202a
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// through 202e.
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|| (ch >= '\u202a' && ch <= '\u202e')
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|| (ch >= '\u206a' && ch <= '\u206f')
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|| ch == '\ufeff');
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}
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public static boolean isISOControl (char c)
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{
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return ((c >= '\u0000' && c <= '\u001f')
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|| (c >= '\u007f' && c <= '\u009f'));
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}
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public static boolean isJavaIdentifierPart (char ch)
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{
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if (isIdentifierIgnorable (ch) || isDigit (ch))
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return true;
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int type = getType (ch);
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return (type == COMBINING_SPACING_MARK || type == NON_SPACING_MARK
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|| type == CURRENCY_SYMBOL || type == CONNECTOR_PUNCTUATION
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|| type == UPPERCASE_LETTER || type == LOWERCASE_LETTER
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|| type == TITLECASE_LETTER || type == MODIFIER_LETTER
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|| type == OTHER_LETTER || type == LETTER_NUMBER);
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}
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public static boolean isJavaIdentifierStart (char ch)
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{
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int type = getType (ch);
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return (type == CURRENCY_SYMBOL || type == CONNECTOR_PUNCTUATION
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|| type == UPPERCASE_LETTER || type == LOWERCASE_LETTER
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|| type == TITLECASE_LETTER || type == MODIFIER_LETTER
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|| type == OTHER_LETTER);
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}
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// Deprecated in 1.2.
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public static boolean isJavaLetter (char ch)
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{
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return ch == '$' || ch == '_' || isLetter (ch);
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}
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// Deprecated in 1.2.
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public static boolean isJavaLetterOrDigit (char ch)
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{
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return ch == '$' || ch == '_' || isLetterOrDigit (ch);
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}
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public static boolean isLetter (char ch)
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{
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int type = getType (ch);
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return (type == UPPERCASE_LETTER || type == LOWERCASE_LETTER
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|| type == TITLECASE_LETTER || type == MODIFIER_LETTER
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|| type == OTHER_LETTER);
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}
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public static boolean isLetterOrDigit (char ch)
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{
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return isDigit (ch) || isLetter (ch);
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}
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public static native boolean isLowerCase (char ch);
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// Deprecated in JCL.
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public static boolean isSpace (char ch)
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{
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return ch == '\n' || ch == '\t' || ch == '\f' || ch == '\r' || ch == ' ';
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}
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public static native boolean isSpaceChar (char ch);
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public static native boolean isTitleCase (char ch);
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public static boolean isUnicodeIdentifierPart (char ch)
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{
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if (isIdentifierIgnorable (ch) || isDigit (ch))
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return true;
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int type = getType (ch);
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return (type == CONNECTOR_PUNCTUATION || type == LETTER_NUMBER
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|| type == COMBINING_SPACING_MARK || type == NON_SPACING_MARK
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|| type == UPPERCASE_LETTER || type == LOWERCASE_LETTER
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|| type == TITLECASE_LETTER || type == MODIFIER_LETTER
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|| type == OTHER_LETTER);
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}
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public static boolean isUnicodeIdentifierStart (char ch)
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{
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return isLetter (ch);
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}
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public static native boolean isUpperCase (char ch);
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public static boolean isWhitespace (char ch)
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{
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return ((ch >= '\u0009' && ch <= '\r')
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|| (ch >= '\u001c' && ch <= '\u001f')
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|| (ch != '\u00a0' && ch != '\ufeff' && isSpaceChar (ch)));
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}
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public static native char toLowerCase (char ch);
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public static native char toTitleCase (char ch);
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public static native char toUpperCase (char ch);
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public String toString ()
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{
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return String.valueOf(value);
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}
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public int compareTo (Character anotherCharacter)
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{
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return value - anotherCharacter.value;
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}
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public int compareTo (Object o)
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{
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return compareTo ((Character) o);
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}
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// Private data.
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private char value;
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}
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