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Diffstat (limited to 'libjava/classpath/java/awt/font/NumericShaper.java')
| -rw-r--r-- | libjava/classpath/java/awt/font/NumericShaper.java | 425 |
1 files changed, 0 insertions, 425 deletions
diff --git a/libjava/classpath/java/awt/font/NumericShaper.java b/libjava/classpath/java/awt/font/NumericShaper.java deleted file mode 100644 index add1c6a..0000000 --- a/libjava/classpath/java/awt/font/NumericShaper.java +++ /dev/null @@ -1,425 +0,0 @@ -/* NumericShaper.java - Copyright (C) 2003 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath 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 for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - - -package java.awt.font; - -import java.io.Serializable; -import java.lang.Character.UnicodeBlock; - -/** - * This class handles numeric shaping. A shaper can either be contextual - * or not. A non-contextual shaper will always translate ASCII digits - * in its input into the target Unicode range. A contextual shaper will - * change the target Unicode range depending on the characters it has - * previously processed. - * - * @author Michael Koch - * @author Tom Tromey - * - * @since 1.4 - * @specnote This class does not handle LIMBU or OSMANYA. - * @specnote The JDK does not seem to properly handle ranges without a - * digit zero, such as TAMIL. This implementation does. - */ -public final class NumericShaper implements Serializable -{ - private static final long serialVersionUID = -8022764705923730308L; - - /** Convenience constant representing all the valid Unicode ranges. */ - public static final int ALL_RANGES = 524287; - - /** - * Constant representing the Unicode ARABIC range. Shaping done - * using this range will translate to the arabic decimal characters. - * Use EASTERN_ARABIC if you want to shape to the eastern arabic - * (also known as the extended arabic) decimal characters. - */ - public static final int ARABIC = 2; - - /** Constant representing the Unicode BENGALI range. */ - public static final int BENGALI = 16; - - /** Constant representing the Unicode DEVANAGARI range. */ - public static final int DEVANAGARI = 8; - - /** - * Constant representing the Unicode extended arabic range. - * In Unicode there are two different sets of arabic digits; - * this selects the extended or eastern set. - */ - public static final int EASTERN_ARABIC = 4; - - /** - * Constant representing the Unicode ETHIOPIC range. Note that - * there is no digit zero in this range; an ASCII digit zero - * is left unchanged when shaping to this range. - */ - public static final int ETHIOPIC = 65536; - - /** - * Constant representing the Unicode EUROPEAN range. For - * contextual shaping purposes, characters in the various - * extended Latin character blocks are recognized as EUROPEAN. - */ - public static final int EUROPEAN = 1; - - /** Constant representing the Unicode GUJARATI range. */ - public static final int GUJARATI = 64; - - /** Constant representing the Unicode GURMUKHI range. */ - public static final int GURMUKHI = 32; - - /** Constant representing the Unicode KANNADA range. */ - public static final int KANNADA = 1024; - - /** Constant representing the Unicode KHMER range. */ - public static final int KHMER = 131072; - - /** Constant representing the Unicode LAO range. */ - public static final int LAO = 8192; - - /** Constant representing the Unicode MALAYALAM range. */ - public static final int MALAYALAM = 2048; - - /** Constant representing the Unicode MONGOLIAN range. */ - public static final int MONGOLIAN = 262144; - - /** Constant representing the Unicode MYANMAR range. */ - public static final int MYANMAR = 32768; - - /** Constant representing the Unicode ORIYA range. */ - public static final int ORIYA = 128; - - /** - * Constant representing the Unicode TAMIL range. Note that - * there is no digit zero in this range; an ASCII digit zero - * is left unchanged when shaping to this range. - */ - public static final int TAMIL = 256; - - /** Constant representing the Unicode TELUGU range. */ - public static final int TELUGU = 512; - - /** Constant representing the Unicode THAI range. */ - public static final int THAI = 4096; - - /** Constant representing the Unicode TIBETAN range. */ - public static final int TIBETAN = 16384; - - /** - * This table holds the zero digits for each language. This is hard-coded - * because the values will not change and the table layout is tied to the - * other constants in this class in any case. In the two places where a - * language does not have a zero digit, the character immediately preceeding - * the one digit is used instead. These languages are special-cased in - * the shaping code. - */ - private static final char[] zeroDigits = - { - '0', // EUROPEAN - '\u0660', // ARABIC - '\u06f0', // EASTERN_ARABIC - '\u0966', // DEVANAGARI - '\u09e6', // BENGALI - '\u0a66', // GURMUKHI - '\u0ae6', // GUJARATI - '\u0b66', // ORIYA - '\u0be6', // TAMIL - special case as there is no digit zero - '\u0c66', // TELUGU - '\u0ce6', // KANNADA - '\u0d66', // MALAYALAM - '\u0e50', // THAI - '\u0ed0', // LAO - '\u0f20', // TIBETAN - '\u1040', // MYANMAR - '\u1368', // ETHIOPIC - special case as there is no digit zero - '\u17e0', // KHMER - '\u1810' // MONGOLIAN - }; - - /** - * The default initial context for this shaper, specified as - * an integer from 0 to 18. - */ - private int key; - - /** - * The target ranges handled by this shaper. If the shaper - * is not contextual, the high bit of this field will be set. - * @specnote This was discovered by reading the serialization spec - */ - private int mask; - - /** - * Create a new numeric shaper. The key given is a constant from - * this class, the constructor turns it into its internal form. - * @param key the key to use, as one of the manifest constants - * @param mask a mask of languages to shape for - */ - private NumericShaper (int key, int mask) - { - // This internal form is a bit goofy, but it is specified by - // the serialization spec. - this.key = Integer.numberOfTrailingZeros(key); - this.mask = mask; - } - - /** - * Return an integer representing all the languages for which this - * shaper will shape. The result is taken by "or"ing together - * the constants representing the various languages. - */ - public int getRanges () - { - return mask & ALL_RANGES; - } - - /** - * Return true if this shaper is contextual, false if it is not. - */ - public boolean isContextual () - { - return mask > 0; - } - - /** - * Shape the text in the given array. The starting context will - * be the context passed to the shaper at creation time. - * @param text the text to shape - * @param start the index of the starting character of the array - * @param count the number of characters in the array - */ - public void shape (char[] text, int start, int count) - { - shape (text, start, count, 1 << key); - } - - /** - * Given a unicode block object, return corresponding language constant. - * If the block is not recognized, returns zero. Note that as there - * is no separate ARABIC block in Character, this case must - * be specially handled by the caller; EASTERN_ARABIC is preferred when - * both are specified. - * @param b the unicode block to classify - * @return the language constant, or zero if not recognized - */ - private int classify(UnicodeBlock b) - { - if (b == null) - return 0; - // ARABIC is handled by the caller; from testing we know - // that EASTERN_ARABIC takes precedence. - if (b == UnicodeBlock.ARABIC) - return EASTERN_ARABIC; - if (b == UnicodeBlock.BENGALI) - return BENGALI; - if (b == UnicodeBlock.DEVANAGARI) - return DEVANAGARI; - if (b == UnicodeBlock.ETHIOPIC) - return ETHIOPIC; - if (b == UnicodeBlock.BASIC_LATIN - || b == UnicodeBlock.LATIN_1_SUPPLEMENT - || b == UnicodeBlock.LATIN_EXTENDED_A - || b == UnicodeBlock.LATIN_EXTENDED_ADDITIONAL - || b == UnicodeBlock.LATIN_EXTENDED_B) - return EUROPEAN; - if (b == UnicodeBlock.GUJARATI) - return GUJARATI; - if (b == UnicodeBlock.GURMUKHI) - return GURMUKHI; - if (b == UnicodeBlock.KANNADA) - return KANNADA; - if (b == UnicodeBlock.KHMER) - return KHMER; - if (b == UnicodeBlock.LAO) - return LAO; - if (b == UnicodeBlock.MALAYALAM) - return MALAYALAM; - if (b == UnicodeBlock.MONGOLIAN) - return MONGOLIAN; - if (b == UnicodeBlock.MYANMAR) - return MYANMAR; - if (b == UnicodeBlock.ORIYA) - return ORIYA; - if (b == UnicodeBlock.TAMIL) - return TAMIL; - if (b == UnicodeBlock.TELUGU) - return TELUGU; - if (b == UnicodeBlock.THAI) - return THAI; - if (b == UnicodeBlock.TIBETAN) - return TIBETAN; - return 0; - } - - /** - * Shape the given text, using the indicated initial context. - * If this shaper is not a contextual shaper, then the given context - * will be ignored. - * @param text the text to shape - * @param start the index of the first character of the text to shape - * @param count the number of characters to shape in the text - * @param context the initial context - * @throws IllegalArgumentException if the initial context is invalid - */ - public void shape (char[] text, int start, int count, int context) - { - int currentContext; - if (isContextual()) - { - if (Integer.bitCount(context) != 1 || (context & ~ALL_RANGES) != 0) - throw new IllegalArgumentException("invalid context argument"); - // If the indicated context is not one we are handling, reset it. - if ((context & mask) == 0) - currentContext = -1; - else - currentContext = Integer.numberOfTrailingZeros(context); - } - else - currentContext = key; - - for (int i = 0; i < count; ++i) - { - char c = text[start + i]; - if (c >= '0' && c <= '9') - { - if (currentContext >= 0) - { - // Shape into the current context. - if (c == '0' - && ((1 << currentContext) == TAMIL - || (1 << currentContext) == ETHIOPIC)) - { - // No digit 0 in this context; do nothing. - } - else - text[start + i] - = (char) (zeroDigits[currentContext] + c - '0'); - } - } - else if (isContextual()) - { - // if c is in a group, set currentContext; else reset it. - int group = classify(UnicodeBlock.of(c)); - // Specially handle ARABIC. - if (group == EASTERN_ARABIC && (mask & EASTERN_ARABIC) == 0 - && (mask & ARABIC) != 0) - group = ARABIC; - if ((mask & group) != 0) - { - // The character was classified as being in a group - // we recognize, and it was selected by the shaper. - // So, change the context. - currentContext = Integer.numberOfTrailingZeros(group); - } - } - } - } - - public boolean equals (Object obj) - { - if (! (obj instanceof NumericShaper)) - return false; - NumericShaper tmp = (NumericShaper) obj; - return key == tmp.key && mask == tmp.mask; - } - - public int hashCode () - { - return key ^ mask; - } - - public String toString () - { - // For debugging only. - return "key=" + key + "; mask=" + mask; - } - - /** - * Return a non-contextual shaper which can shape to a single range. - * All ASCII digits in the input text are translated to this language. - * @param singleRange the target language - * @return a non-contextual shaper for this language - * @throws IllegalArgumentException if the argument does not name a - * single language, as specified by the constants declared in this class - */ - public static NumericShaper getShaper (int singleRange) - { - if (Integer.bitCount(singleRange) != 1) - throw new IllegalArgumentException("more than one bit set in argument"); - if ((singleRange & ~ALL_RANGES) != 0) - throw new IllegalArgumentException("argument out of range"); - return new NumericShaper(singleRange, Integer.MIN_VALUE | singleRange); - } - - /** - * Return a contextual shaper which can shape to any of the indicated - * languages. The default initial context for this shaper is EUROPEAN. - * @param ranges the ranges to shape to - * @return a contextual shaper which will target any of these ranges - * @throws IllegalArgumentException if the argument specifies an - * unrecognized range - */ - public static NumericShaper getContextualShaper (int ranges) - { - if ((ranges & ~ALL_RANGES) != 0) - throw new IllegalArgumentException("argument out of range"); - return new NumericShaper(EUROPEAN, ranges); - } - - /** - * Return a contextual shaper which can shape to any of the indicated - * languages. The default initial context for this shaper is given as - * an argument. - * @param ranges the ranges to shape to - * @param defaultContext the default initial context - * @return a contextual shaper which will target any of these ranges - * @throws IllegalArgumentException if the ranges argument specifies an - * unrecognized range, or if the defaultContext argument does not specify - * a single valid range - */ - public static NumericShaper getContextualShaper (int ranges, - int defaultContext) - { - if (Integer.bitCount(defaultContext) != 1) - throw new IllegalArgumentException("more than one bit set in context"); - if ((ranges & ~ALL_RANGES) != 0 || (defaultContext & ~ALL_RANGES) != 0) - throw new IllegalArgumentException("argument out of range"); - return new NumericShaper(defaultContext, ranges); - } -} |