/* ******************************************************************************* * * Copyright (C) 2001-2002, International Business Machines * Corporation and others. All Rights Reserved. * ******************************************************************************* * file name: unormimp.h * encoding: US-ASCII * tab size: 8 (not used) * indentation:4 * * created on: 2001may25 * created by: Markus W. Scherer */ #ifndef __UNORMIMP_H__ #define __UNORMIMP_H__ #include "unicode/utypes.h" #include "unicode/uiter.h" #include "unicode/unorm.h" #include "utrie.h" #include "uset.h" #include "ustr_imp.h" /* * This new implementation of the normalization code loads its data from * unorm.dat, which is generated with the gennorm tool. * The format of that file is described at the end of this file. */ /* norm32 value constants */ enum { /* quick check flags 0..3 set mean "no" for their forms */ _NORM_QC_NFC=0x11, /* no|maybe */ _NORM_QC_NFKC=0x22, /* no|maybe */ _NORM_QC_NFD=4, /* no */ _NORM_QC_NFKD=8, /* no */ _NORM_QC_ANY_NO=0xf, /* quick check flags 4..5 mean "maybe" for their forms; test flags>=_NORM_QC_MAYBE */ _NORM_QC_MAYBE=0x10, _NORM_QC_ANY_MAYBE=0x30, _NORM_QC_MASK=0x3f, _NORM_COMBINES_FWD=0x40, _NORM_COMBINES_BACK=0x80, _NORM_COMBINES_ANY=0xc0, _NORM_CC_SHIFT=8, /* UnicodeData.txt combining class in bits 15..8 */ _NORM_CC_MASK=0xff00, _NORM_EXTRA_SHIFT=16, /* 16 bits for the index to UChars and other extra data */ _NORM_EXTRA_INDEX_TOP=0xfc00, /* start of surrogate specials after shift */ _NORM_EXTRA_SURROGATE_MASK=0x3ff, _NORM_EXTRA_SURROGATE_TOP=0x3f0, /* hangul etc. */ _NORM_EXTRA_HANGUL=_NORM_EXTRA_SURROGATE_TOP, _NORM_EXTRA_JAMO_L, /* ### not used */ _NORM_EXTRA_JAMO_V, _NORM_EXTRA_JAMO_T }; /* norm32 value constants using >16 bits */ #define _NORM_MIN_SPECIAL 0xfc000000 #define _NORM_SURROGATES_TOP 0xfff00000 #define _NORM_MIN_HANGUL 0xfff00000 #define _NORM_MIN_JAMO_V 0xfff20000 #define _NORM_JAMO_V_TOP 0xfff30000 /* value constants for auxTrie */ enum { _NORM_AUX_UNSAFE_SHIFT=14, _NORM_AUX_FNC_SHIFT=20, _NORM_AUX_COMP_EX_SHIFT=30, _NORM_AUX_IS_LEAD_SHIFT=31 }; #define _NORM_AUX_MAX_CANON_SET ((uint32_t)1<<_NORM_AUX_UNSAFE_SHIFT) #define _NORM_AUX_MAX_FNC ((int32_t)1<<(_NORM_AUX_COMP_EX_SHIFT-_NORM_AUX_FNC_SHIFT)) #define _NORM_AUX_CANON_SET_MASK (_NORM_AUX_MAX_CANON_SET-1) #define _NORM_AUX_UNSAFE_MASK ((uint32_t)1<<_NORM_AUX_UNSAFE_SHIFT) #define _NORM_AUX_FNC_MASK ((uint32_t)(_NORM_AUX_MAX_FNC-1)<<_NORM_AUX_FNC_SHIFT) #define _NORM_AUX_COMP_EX_MASK ((uint32_t)1<<_NORM_AUX_COMP_EX_SHIFT) #define _NORM_AUX_IS_LEAD_MASK ((uint32_t)1<<_NORM_AUX_IS_LEAD_SHIFT) /* indexes[] value names */ enum { _NORM_INDEX_TRIE_SIZE, /* number of bytes in normalization trie */ _NORM_INDEX_UCHAR_COUNT, /* number of UChars in extra data */ _NORM_INDEX_COMBINE_DATA_COUNT, /* number of uint16_t words for combining data */ _NORM_INDEX_COMBINE_FWD_COUNT, /* number of code points that combine forward */ _NORM_INDEX_COMBINE_BOTH_COUNT, /* number of code points that combine forward and backward */ _NORM_INDEX_COMBINE_BACK_COUNT, /* number of code points that combine backward */ _NORM_INDEX_MIN_NFC_NO_MAYBE, /* first code point with quick check NFC NO/MAYBE */ _NORM_INDEX_MIN_NFKC_NO_MAYBE, /* first code point with quick check NFKC NO/MAYBE */ _NORM_INDEX_MIN_NFD_NO_MAYBE, /* first code point with quick check NFD NO/MAYBE */ _NORM_INDEX_MIN_NFKD_NO_MAYBE, /* first code point with quick check NFKD NO/MAYBE */ _NORM_INDEX_FCD_TRIE_SIZE, /* number of bytes in FCD trie */ _NORM_INDEX_AUX_TRIE_SIZE, /* number of bytes in the auxiliary trie */ _NORM_INDEX_CANON_SET_COUNT, /* number of uint16_t in the array of serialized USet */ _NORM_INDEX_TOP=32 /* changing this requires a new formatVersion */ }; enum { /* FCD check: everything below this code point is known to have a 0 lead combining class */ _NORM_MIN_WITH_LEAD_CC=0x300 }; enum { /** * Bit 7 of the length byte for a decomposition string in extra data is * a flag indicating whether the decomposition string is * preceded by a 16-bit word with the leading and trailing cc * of the decomposition (like for A-umlaut); * if not, then both cc's are zero (like for compatibility ideographs). */ _NORM_DECOMP_FLAG_LENGTH_HAS_CC=0x80, /** * Bits 6..0 of the length byte contain the actual length. */ _NORM_DECOMP_LENGTH_MASK=0x7f }; /** * Is the normalizer data loaded? * This is used internally before other internal normalizer functions * are called. * It saves this check in each of many normalization calls that * are made for, e.g., collation. * * @param pErrorCode as usual * @return boolean value for whether the normalization data is loaded * * @internal */ U_CAPI UBool U_EXPORT2 unorm_haveData(UErrorCode *pErrorCode); /** * Internal API for normalizing. * Does not check for bad input. * @internal */ U_CAPI int32_t U_EXPORT2 unorm_internalNormalize(UChar *dest, int32_t destCapacity, const UChar *src, int32_t srcLength, UNormalizationMode mode, UBool ignoreHangul, UErrorCode *pErrorCode); /** * internal API, used by normlzr.cpp * @internal */ U_CAPI int32_t U_EXPORT2 unorm_decompose(UChar *dest, int32_t destCapacity, const UChar *src, int32_t srcLength, UBool compat, UBool ignoreHangul, UErrorCode *pErrorCode); /** * internal API, used by normlzr.cpp * @internal */ U_CAPI int32_t U_EXPORT2 unorm_compose(UChar *dest, int32_t destCapacity, const UChar *src, int32_t srcLength, UBool compat, UBool ignoreHangul, UErrorCode *pErrorCode); /** * Internal API, used by collation code. * Get access to the internal FCD trie table to be able to perform * incremental, per-code unit, FCD checks in collation. * One pointer is sufficient because the trie index values are offset * by the index size, so that the same pointer is used to access the trie data. * @internal */ U_CAPI const uint16_t * U_EXPORT2 unorm_getFCDTrie(UErrorCode *pErrorCode); #ifdef XP_CPLUSPLUS U_NAMESPACE_BEGIN /** * Internal API, used by collation code. * Get the FCD value for a code unit, with * bits 15..8 lead combining class * bits 7..0 trail combining class * * If c is a lead surrogate and the value is not 0, * then instead of combining classes the value * is used in unorm_getFCD16FromSurrogatePair() to get the real value * of the supplementary code point. * * @internal */ inline uint16_t unorm_getFCD16(const uint16_t *fcdTrieIndex, UChar c) { return fcdTrieIndex[ (fcdTrieIndex[ c>>UTRIE_SHIFT ]<>UTRIE_SHIFT) ]<=2.1) * * uint16_t combiningTable[combiningTableTop]; -- combiningTableTop=indexes[_NORM_INDEX_COMBINE_DATA_COUNT] * combiningTableTop may include one 16-bit padding unit * to make sure that fcdTrie is 32-bit-aligned * * UTrie fcdTrie; -- size in bytes=indexes[_NORM_INDEX_FCD_TRIE_SIZE] * * UTrie auxTrie; -- size in bytes=indexes[_NORM_INDEX_AUX_TRIE_SIZE] * * uint16_t canonStartSets[canonStartSetsTop] -- canonStartSetsTop=indexes[_NORM_INDEX_CANON_SET_COUNT] * serialized USets, see uset.c * * * The indexes array contains lengths and sizes of the following arrays and structures * as well as the following values: * indexes[_NORM_INDEX_COMBINE_FWD_COUNT]=combineFwdTop * -- one more than the highest combining index computed for forward-only-combining characters * indexes[_NORM_INDEX_COMBINE_BOTH_COUNT]=combineBothTop-combineFwdTop * -- number of combining indexes computed for both-ways-combining characters * indexes[_NORM_INDEX_COMBINE_BACK_COUNT]=combineBackTop-combineBothTop * -- number of combining indexes computed for backward-only-combining characters * * indexes[_NORM_INDEX_MIN_NF*_NO_MAYBE] (where *={ C, D, KC, KD }) * -- first code point with a quick check NF* value of NO/MAYBE * * * - Tries * * The main structures are two UTrie tables ("compact arrays"), * each with one index array and one data array. * See utrie.h and utrie.c. * * * - Tries in unorm.dat * * The first trie (normTrie above) * provides data for the NF* quick checks and normalization. * The second trie (fcdTrie above) provides data just for FCD checks. * * * - norm32 data words from the first trie * * The norm32Table contains one 32-bit word "norm32" per code point. * It contains the following bit fields: * 31..16 extra data index, _NORM_EXTRA_SHIFT is used to shift this field down * if this index is <_NORM_EXTRA_INDEX_TOP then it is an index into * extraData[] where variable-length normalization data for this * code point is found * if this index is <_NORM_EXTRA_INDEX_TOP+_NORM_EXTRA_SURROGATE_TOP * then this is a norm32 for a leading surrogate, and the index * value is used together with the following trailing surrogate * code unit in the second trie access * if this index is >=_NORM_EXTRA_INDEX_TOP+_NORM_EXTRA_SURROGATE_TOP * then this is a norm32 for a "special" character, * i.e., the character is a Hangul syllable or a Jamo * see _NORM_EXTRA_HANGUL etc. * generally, instead of extracting this index from the norm32 and * comparing it with the above constants, * the normalization code compares the entire norm32 value * with _NORM_MIN_SPECIAL, _NORM_SURROGATES_TOP, _NORM_MIN_HANGUL etc. * * 15..8 combining class (cc) according to UnicodeData.txt * * 7..6 _NORM_COMBINES_ANY flags, used in composition to see if a character * combines with any following or preceding character(s) * at all * 7 _NORM_COMBINES_BACK * 6 _NORM_COMBINES_FWD * * 5..0 quick check flags, set for "no" or "maybe", with separate flags for * each normalization form * the higher bits are "maybe" flags; for NF*D there are no such flags * the lower bits are "no" flags for all forms, in the same order * as the "maybe" flags, * which is (MSB to LSB): NFKD NFD NFKC NFC * 5..4 _NORM_QC_ANY_MAYBE * 3..0 _NORM_QC_ANY_NO * see further related constants * * * - Extra data per code point * * "Extra data" is referenced by the index in norm32. * It is variable-length data. It is only present, and only those parts * of it are, as needed for a given character. * The norm32 extra data index is added to the beginning of extraData[] * to get to a vector of 16-bit words with data at the following offsets: * * [-1] Combining index for composition. * Stored only if norm32&_NORM_COMBINES_ANY . * [0] Lengths of the canonical and compatibility decomposition strings. * Stored only if there are decompositions, i.e., * if norm32&(_NORM_QC_NFD|_NORM_QC_NFKD) * High byte: length of NFKD, or 0 if none * Low byte: length of NFD, or 0 if none * Each length byte also has another flag: * Bit 7 of a length byte is set if there are non-zero * combining classes (cc's) associated with the respective * decomposition. If this flag is set, then the decomposition * is preceded by a 16-bit word that contains the * leading and trailing cc's. * Bits 6..0 of a length byte are the length of the * decomposition string, not counting the cc word. * [1..n] NFD * [n+1..] NFKD * * Each of the two decompositions consists of up to two parts: * - The 16-bit words with the leading and trailing cc's. * This is only stored if bit 7 of the corresponding length byte * is set. In this case, at least one of the cc's is not zero. * High byte: leading cc==cc of the first code point in the decomposition string * Low byte: trailing cc==cc of the last code point in the decomposition string * - The decomposition string in UTF-16, with length code units. * * * - Combining indexes and combiningTable[] * * Combining indexes are stored at the [-1] offset of the extra data * if the character combines forward or backward with any other characters. * They are used for (re)composition in NF*C. * Values of combining indexes are arranged according to whether a character * combines forward, backward, or both ways: * forward-only < both ways < backward-only * * The index values for forward-only and both-ways combining characters * are indexes into the combiningTable[]. * The index values for backward-only combining characters are simply * incremented from the preceding index values to be unique. * * In the combiningTable[], a variable-length list * of variable-length (back-index, code point) pair entries is stored * for each forward-combining character. * * These back-indexes are the combining indexes of both-ways or backward-only * combining characters that the forward-combining character combines with. * * Each list is sorted in ascending order of back-indexes. * Each list is terminated with the last back-index having bit 15 set. * * Each pair (back-index, code point) takes up either 2 or 3 * 16-bit words. * The first word of a list entry is the back-index, with its bit 15 set if * this is the last pair in the list. * * The second word contains flags in bits 15..13 that determine * if there is a third word and how the combined character is encoded: * 15 set if there is a third word in this list entry * 14 set if the result is a supplementary character * 13 set if the result itself combines forward * * According to these bits 15..14 of the second word, * the result character is encoded as follows: * 00 or 01 The result is <=0x1fff and stored in bits 12..0 of * the second word. * 10 The result is 0x2000..0xffff and stored in the third word. * Bits 12..0 of the second word are not used. * 11 The result is a supplementary character. * Bits 9..0 of the leading surrogate are in bits 9..0 of * the second word. * Add 0xd800 to these bits to get the complete surrogate. * Bits 12..10 of the second word are not used. * The trailing surrogate is stored in the third word. * * * - FCD trie * * The FCD trie is very simple. * It is a folded trie with 16-bit data words. * In each word, the high byte contains the leading cc of the character, * and the low byte contains the trailing cc of the character. * These cc's are the cc's of the first and last code points in the * canonical decomposition of the character. * * Since all 16 bits are used for cc's, lead surrogates must be tested * by checking the code unit instead of the trie data. * This is done only if the 16-bit data word is not zero. * If the code unit is a leading surrogate and the data word is not zero, * then instead of cc's it contains the offset for the second trie lookup. * * * - Auxiliary trie and data * * The auxiliary 32-bit trie contains data for additional properties. * Bits * 31 set if lead surrogate offset * 30 composition exclusion * 29..20 index into extraData[] to FC_NFKC_Closure string (bit 31==0), * or lead surrogate offset (bit 31==1) * 19..16 skippable flags * 15 reserved * 14 flag: not a safe starter for canonical closure * 13.. 0 index to serialized USet for canonical closure * the set lists the code points whose decompositions start with * the one that this data is for * for how USets are serialized see uset.c * * - FC_NFKC_Closure strings in extraData[] * * Strings are either stored as a single code unit or as the length * followed by that many units. * const UChar *s=extraData+(index from auxTrie data bits 29..20); * int32_t length; * if(*s<0xff00) { * // s points to the single-unit string * length=1; * } else { * length=*s&0xff; * ++s; * } */ #endif