/* ******************************************************************************* * Copyright (C) 2012-2014, International Business Machines * Corporation and others. All Rights Reserved. ******************************************************************************* * CollationFCD.java, ported from collationfcd.h/.cpp * * C++ version created on: 2012aug18 * created by: Markus W. Scherer */ package com.ibm.icu.impl.coll; import com.ibm.icu.text.UTF16; /** * Data and functions for the FCD check fast path. * * The fast path looks at a pair of 16-bit code units and checks * whether there is an FCD boundary between them; * there is if the first unit has a trailing ccc=0 (!hasTccc(first)) * or the second unit has a leading ccc=0 (!hasLccc(second)), * or both. * When the fast path finds a possible non-boundary, * then the FCD check slow path looks at the actual sequence of FCD values. * * This is a pure optimization. * The fast path must at least find all possible non-boundaries. * If the fast path is too pessimistic, it costs performance. * * For a pair of BMP characters, the fast path tests are precise (1 bit per character). * * For a supplementary code point, the two units are its lead and trail surrogates. * We set hasTccc(lead)=true if any of its 1024 associated supplementary code points * has lccc!=0 or tccc!=0. * We set hasLccc(trail)=true for all trail surrogates. * As a result, we leave the fast path if the lead surrogate might start a * supplementary code point that is not FCD-inert. * (So the fast path need not detect that there is a surrogate pair, * nor look ahead to the next full code point.) * * hasLccc(lead)=true if any of its 1024 associated supplementary code points * has lccc!=0, for fast boundary checking between BMP & supplementary. * * hasTccc(trail)=false: * It should only be tested for unpaired trail surrogates which are FCD-inert. */ public final class CollationFCD { public static boolean hasLccc(int c) { assert c <= 0xffff; // c can be negative, e.g., Collation.SENTINEL_CP from UCharIterator; // that is handled in the first test. int i; return // U+0300 is the first character with lccc!=0. c >= 0x300 && (i = lcccIndex[c >> 5]) != 0 && (lcccBits[i] & (1 << (c & 0x1f))) != 0; } public static boolean hasTccc(int c) { assert c <= 0xffff; // c can be negative, e.g., Collation.SENTINEL_CP from UCharIterator; // that is handled in the first test. int i; return // U+00C0 is the first character with tccc!=0. c >= 0xc0 && (i = tcccIndex[c >> 5]) != 0 && (tcccBits[i] & (1 << (c & 0x1f))) != 0; } static boolean mayHaveLccc(int c) { // Handles all of Unicode 0..10FFFF. // c can be negative, e.g., Collation.SENTINEL_CP. // U+0300 is the first character with lccc!=0. if(c < 0x300) { return false; } if(c > 0xffff) { c = UTF16.getLeadSurrogate(c); } int i; return (i = lcccIndex[c >> 5]) != 0 && (lcccBits[i] & (1 << (c & 0x1f))) != 0; } /** * Tibetan composite vowel signs (U+0F73, U+0F75, U+0F81) * must be decomposed before reaching the core collation code, * or else some sequences including them, even ones passing the FCD check, * do not yield canonically equivalent results. * * This is a fast and imprecise test. * * @param c a code point * @return true if c is U+0F73, U+0F75 or U+0F81 or one of several other Tibetan characters */ static boolean maybeTibetanCompositeVowel(int c) { return (c & 0x1fff01) == 0xf01; } /** * Tibetan composite vowel signs (U+0F73, U+0F75, U+0F81) * must be decomposed before reaching the core collation code, * or else some sequences including them, even ones passing the FCD check, * do not yield canonically equivalent results. * * They have distinct lccc/tccc combinations: 129/130 or 129/132. * * @param fcd16 the FCD value (lccc/tccc combination) of a code point * @return true if fcd16 is from U+0F73, U+0F75 or U+0F81 */ static boolean isFCD16OfTibetanCompositeVowel(int fcd16) { return fcd16 == 0x8182 || fcd16 == 0x8184; } // CollationFCD(); // No instantiation. // TODO: machine-generate by: icu/tools/unicode/c/genuca/genuca.cpp private static final byte[] lcccIndex={ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,1,1,2,3,0,0,0,0, 0,0,0,0,4,0,0,0,0,0,0,0,5,6,7,0, 8,0,9,0xa,0,0,0xb,0xc,0xd,0xe,0xf,0,0,0,0,0x10, 0x11,0x12,0x13,0,0,0,0,0x14,0,0x15,0x16,0,0,0x15,0x17,0, 0,0x15,0x17,0,0,0x15,0x17,0,0,0x15,0x17,0,0,0,0x17,0, 0,0,0x18,0,0,0x15,0x17,0,0,0,0x17,0,0,0,0x19,0, 0,0x1a,0x1b,0,0,0x1c,0x1b,0,0x1c,0x1d,0,0x1e,0x1f,0,0x20,0, 0,0x21,0,0,0x17,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0x22,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0x23,0x23,0,0,0,0,0x24,0, 0,0,0,0,0,0x25,0,0,0,0x13,0,0,0,0,0,0, 0x26,0,0,0x27,0,0x28,0,0,0,0x23,0x29,0x10,0,0x2a,0,0x2b, 0,0x2c,0,0,0,0,0x2d,0x2e,0,0,0,0,0,0,1,0x2f, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0x30,0x31,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0x32,0,0,0,0x33,0,0,0,1, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0x34,0,0,0x35,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0x41,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0x42,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }; private static final byte[] tcccIndex={ 0,0,0,0,0,0,2,3,4,5,6,7,0,8,9,0xa, 0xb,0xc,0,0,0,0,0,0,1,1,0xd,0xe,0xf,0x10,0x11,0, 0x12,0x13,0x14,0x15,0x16,0,0x17,0x18,0,0,0,0,0x19,0x1a,0x1b,0, 0x1c,0x1d,0x1e,0x1f,0,0,0x20,0x21,0x22,0x23,0x24,0,0,0,0,0x25, 0x26,0x27,0x28,0,0,0,0,0x29,0,0x2a,0x2b,0,0,0x2c,0x2d,0, 0,0x2e,0x2f,0,0,0x2c,0x30,0,0,0x2c,0x31,0,0,0,0x30,0, 0,0,0x32,0,0,0x2c,0x30,0,0,0,0x30,0,0,0,0x33,0, 0,0x34,0x35,0,0,0x36,0x35,0,0x36,0x37,0,0x38,0x39,0,0x3a,0, 0,0x3b,0,0,0x30,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0x3c,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0x3d,0x3d,0,0,0,0,0x3e,0, 0,0,0,0,0,0x3f,0,0,0,0x28,0,0,0,0,0,0, 0x40,0,0,0x41,0,0x42,0,0,0,0x3d,0x43,0x25,0,0x44,0,0x45, 0,0x46,0,0,0,0,0x47,0x48,0,0,0,0,0,0,1,0x49, 1,1,1,1,0x4a,1,1,0x4b,0x4c,1,0x4d,0x4e,1,0x4f,0x50,0x51, 0,0,0,0,0,0,0x52,0x53,0,0x54,0,0,0x55,0x56,0x57,0, 0x58,0x59,0x5a,0x5b,0x5c,0x5d,0,0x5e,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0x2c,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0x5f,0,0,0,0x60,0,0,0,1, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0x61,0x62,0x63,0x64,0x62,0x63,0x65,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0x66,0x60,0,0,0x67,0,0,0,0,0,0,0,0, 0x3a,0,0,0,0,0,0x43,0x68,0,0x69,0x6a,0,0,0x6a,0x6b,0, 0,0,0,0,0,0x6c,0x6d,0x6e,0,0,0,0,0,0,0,0x30, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0x6f,0x70,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0x3c,0x71,0x72,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0x73,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }; private static final int[] lcccBits={ 0,0xffffffff,0xffff7fff,0xffff,0xf8,0xfffe0000,0xbfffffff,0xb6,0x7ff0000,0xfffff800,0x10000,0x9fc00000,0x3d9f,0x20000,0xffff0000,0x7ff, 0xff800,0xfbc00000,0x3eef,0xe000000,0xfffffff0,0x10000000,0x1e2000,0x2000,0x602000,0x400,0x7000000,0xf00,0x3000000,0x2a00000,0x3c3e0000,0xdf, 0x40,0x6800000,0xe0000000,0x100000,0x20040000,0x200,0x1800000,0x9fe00001,0x3fff0000,0x10,0xc00,0xc0040,0x800000,0xfff70000,0x31021fd,0xf03fffff, 0x1fff0000,0x1ffe2,0x38000,0x80000000,0xfc00,0x6000000,0x3ff08000,0x30000,0x3ffff,0x3800,0x80000,1,0xc19d0000,2,0x400000,0x4000035, 0x4108000,0x40000000,0x3fff }; private static final int[] tcccBits={ 0,0xffffffff,0x3e7effbf,0xbe7effbf,0xfffcffff,0x7ef1ff3f,0xfff3f1f8,0x7fffff3f,0x18003,0xdfffe000,0xff31ffcf,0xcfffffff,0xfffc0,0xffff7fff,0xffff,0x1d760, 0x1fc00,0x187c00,0x200708b,0x2000000,0x708b0000,0xc00000,0xf8,0xfccf0006,0x33ffcfc,0xfffe0000,0xbfffffff,0xb6,0x7ff0000,0x7c,0xfffff800,0x10000, 0x9fc80005,0x3d9f,0x20000,0xffff0000,0x7ff,0xff800,0xfbc00000,0x3eef,0xe000000,0xfffffff0,0x10120200,0xff1e2000,0x10000000,0xb0002000,0x10480000,0x4e002000, 0x2000,0x30002000,0x602100,0x24000400,0x7000000,0xf00,0x3000000,0x2a00000,0x3d7e0000,0xdf,0x40,0x6800000,0xe0000000,0x100000,0x20040000,0x200, 0x1800000,0x9fe00001,0x3fff0000,0x10,0xc00,0xc0040,0x800000,0xfff70000,0x31021fd,0xf03fffff,0xbffffff,0x3ffffff,0x3f3fffff,0xaaff3f3f,0x3fffffff,0x1fdfffff, 0xefcfffde,0x1fdc7fff,0x1fff0000,0x1ffe2,0x800,0xc000000,0x4000,0xe000,0x1210,0x50,0x292,0x333e005,0x333,0xf000,0x3c0f,0x38000, 0x80000000,0xfc00,0x55555000,0x36db02a5,0x46100000,0x47900000,0x3ff08000,0x30000,0x3ffff,0x3800,0x80000,1,0xc19d0000,2,0x400000,0x4000035, 0x4108000,0x5f7ffc00,0x7fdb,0x3fff }; }