344 lines
10 KiB
C
344 lines
10 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 2004-2005, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: ucase.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2004aug30
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* created by: Markus W. Scherer
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*
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* Low-level Unicode character/string case mapping code.
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*/
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#ifndef __UCASE_H__
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#define __UCASE_H__
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#include "unicode/utypes.h"
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#include "unicode/uset.h"
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#include "uset_imp.h"
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#include "udataswp.h"
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U_CDECL_BEGIN
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/* library API -------------------------------------------------------------- */
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struct UCaseProps;
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typedef struct UCaseProps UCaseProps;
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U_CAPI UCaseProps * U_EXPORT2
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ucase_open(UErrorCode *pErrorCode);
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U_CAPI UCaseProps * U_EXPORT2
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ucase_openBinary(const uint8_t *bin, int32_t length, UErrorCode *pErrorCode);
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U_CAPI void U_EXPORT2
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ucase_close(UCaseProps *csp);
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U_CAPI UCaseProps * U_EXPORT2
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ucase_getSingleton(UErrorCode *pErrorCode);
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U_CAPI int32_t U_EXPORT2
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ucase_swap(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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U_CAPI void U_EXPORT2
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ucase_addPropertyStarts(const UCaseProps *csp, const USetAdder *sa, UErrorCode *pErrorCode);
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/**
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* Bit mask for getting just the options from a string compare options word
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* that are relevant for case-insensitive string comparison.
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* See uchar.h. Also include _STRNCMP_STYLE and U_COMPARE_CODE_POINT_ORDER.
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* @internal
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*/
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#define _STRCASECMP_OPTIONS_MASK 0xffff
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/**
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* Bit mask for getting just the options from a string compare options word
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* that are relevant for case folding (of a single string or code point).
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* See uchar.h.
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* @internal
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*/
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#define _FOLD_CASE_OPTIONS_MASK 0xff
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/* single-code point functions */
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U_CAPI UChar32 U_EXPORT2
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ucase_tolower(const UCaseProps *csp, UChar32 c);
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U_CAPI UChar32 U_EXPORT2
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ucase_toupper(const UCaseProps *csp, UChar32 c);
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U_CAPI UChar32 U_EXPORT2
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ucase_totitle(const UCaseProps *csp, UChar32 c);
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U_CAPI UChar32 U_EXPORT2
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ucase_fold(UCaseProps *csp, UChar32 c, uint32_t options);
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/**
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* Adds all simple case mappings and the full case folding for c to sa,
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* and also adds special case closure mappings.
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* c itself is not added.
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* For example, the mappings
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* - for s include long s
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* - for sharp s include ss
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* - for k include the Kelvin sign
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*/
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U_CAPI void U_EXPORT2
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ucase_addCaseClosure(const UCaseProps *csp, UChar32 c, const USetAdder *sa);
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/**
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* Maps the string to single code points and adds the associated case closure
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* mappings.
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* The string is mapped to code points if it is their full case folding string.
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* In other words, this performs a reverse full case folding and then
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* adds the case closure items of the resulting code points.
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* If the string is found and its closure applied, then
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* the string itself is added as well as part of its code points' closure.
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* It must be length>=0.
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*
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* @return TRUE if the string was found
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*/
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U_CAPI UBool U_EXPORT2
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ucase_addStringCaseClosure(const UCaseProps *csp, const UChar *s, int32_t length, const USetAdder *sa);
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/** @return UCASE_NONE, UCASE_LOWER, UCASE_UPPER, UCASE_TITLE */
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U_CAPI int32_t U_EXPORT2
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ucase_getType(const UCaseProps *csp, UChar32 c);
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/** @return same as ucase_getType(), or <0 if c is case-ignorable */
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U_CAPI int32_t U_EXPORT2
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ucase_getTypeOrIgnorable(const UCaseProps *csp, UChar32 c);
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U_CAPI UBool U_EXPORT2
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ucase_isSoftDotted(const UCaseProps *csp, UChar32 c);
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U_CAPI UBool U_EXPORT2
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ucase_isCaseSensitive(const UCaseProps *csp, UChar32 c);
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/* string case mapping functions */
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/**
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* Iterator function for string case mappings, which need to look at the
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* context (surrounding text) of a given character for conditional mappings.
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*
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* The iterator only needs to go backward or forward away from the
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* character in question. It does not use any indexes on this interface.
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* It does not support random access or an arbitrary change of
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* iteration direction.
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*
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* The code point being case-mapped itself is never returned by
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* this iterator.
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*
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* @param context A pointer to the iterator's working data.
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* @param dir If <0 then start iterating backward from the character;
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* if >0 then start iterating forward from the character;
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* if 0 then continue iterating in the current direction.
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* @return Next code point, or <0 when the iteration is done.
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*/
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typedef UChar32 U_CALLCONV
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UCaseContextIterator(void *context, int8_t dir);
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/**
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* Sample struct which may be used by some implementations of
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* UCaseContextIterator.
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*/
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struct UCaseContext {
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void *p;
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int32_t start, index, limit;
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int32_t cpStart, cpLimit;
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int8_t dir;
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int8_t b1, b2, b3;
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};
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typedef struct UCaseContext UCaseContext;
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enum {
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/**
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* For string case mappings, a single character (a code point) is mapped
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* either to itself (in which case in-place mapping functions do nothing),
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* or to another single code point, or to a string.
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* Aside from the string contents, these are indicated with a single int32_t
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* value as follows:
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*
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* Mapping to self: Negative values (~self instead of -self to support U+0000)
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*
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* Mapping to another code point: Positive values >UCASE_MAX_STRING_LENGTH
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*
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* Mapping to a string: The string length (0..UCASE_MAX_STRING_LENGTH) is
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* returned. Note that the string result may indeed have zero length.
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*/
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UCASE_MAX_STRING_LENGTH=0x1f
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};
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/**
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* Get the full lowercase mapping for c.
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*
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* @param csp Case mapping properties.
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* @param c Character to be mapped.
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* @param iter Character iterator, used for context-sensitive mappings.
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* See UCaseContextIterator for details.
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* If iter==NULL then a context-independent result is returned.
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* @param context Pointer to be passed into iter.
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* @param pString If the mapping result is a string, then the pointer is
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* written to *pString.
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* @param locale Locale ID for locale-dependent mappings.
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* @param locCache Initialize to 0; may be used to cache the result of parsing
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* the locale ID for subsequent calls.
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* Can be NULL.
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* @return Output code point or string length, see UCASE_MAX_STRING_LENGTH.
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*
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* @see UCaseContextIterator
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* @see UCASE_MAX_STRING_LENGTH
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* @internal
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*/
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U_CAPI int32_t U_EXPORT2
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ucase_toFullLower(const UCaseProps *csp, UChar32 c,
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UCaseContextIterator *iter, void *context,
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const UChar **pString,
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const char *locale, int32_t *locCache);
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U_CAPI int32_t U_EXPORT2
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ucase_toFullUpper(const UCaseProps *csp, UChar32 c,
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UCaseContextIterator *iter, void *context,
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const UChar **pString,
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const char *locale, int32_t *locCache);
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U_CAPI int32_t U_EXPORT2
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ucase_toFullTitle(const UCaseProps *csp, UChar32 c,
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UCaseContextIterator *iter, void *context,
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const UChar **pString,
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const char *locale, int32_t *locCache);
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U_CAPI int32_t U_EXPORT2
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ucase_toFullFolding(const UCaseProps *csp, UChar32 c,
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const UChar **pString,
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uint32_t options);
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/* file definitions --------------------------------------------------------- */
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#define UCASE_DATA_NAME "ucase"
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#define UCASE_DATA_TYPE "icu"
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/* format "cAsE" */
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#define UCASE_FMT_0 0x63
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#define UCASE_FMT_1 0x41
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#define UCASE_FMT_2 0x53
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#define UCASE_FMT_3 0x45
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/* indexes into indexes[] */
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enum {
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UCASE_IX_INDEX_TOP,
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UCASE_IX_LENGTH,
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UCASE_IX_TRIE_SIZE,
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UCASE_IX_EXC_LENGTH,
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UCASE_IX_UNFOLD_LENGTH,
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UCASE_IX_MAX_FULL_LENGTH=15,
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UCASE_IX_TOP=16
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};
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/* definitions for 16-bit case properties word ------------------------------ */
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/* 2-bit constants for types of cased characters */
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#define UCASE_TYPE_MASK 3
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enum {
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UCASE_NONE,
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UCASE_LOWER,
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UCASE_UPPER,
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UCASE_TITLE
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};
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#define UCASE_GET_TYPE(props) ((props)&UCASE_TYPE_MASK)
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#define UCASE_SENSITIVE 4
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#define UCASE_EXCEPTION 8
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#define UCASE_DOT_MASK 0x30
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enum {
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UCASE_NO_DOT=0, /* normal characters with cc=0 */
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UCASE_SOFT_DOTTED=0x10, /* soft-dotted characters with cc=0 */
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UCASE_ABOVE=0x20, /* "above" accents with cc=230 */
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UCASE_OTHER_ACCENT=0x30 /* other accent character (0<cc!=230) */
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};
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/* no exception: bits 15..6 are a 10-bit signed case mapping delta */
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#define UCASE_DELTA_SHIFT 6
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#define UCASE_DELTA_MASK 0xffc0
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#define UCASE_MAX_DELTA 0x1ff
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#define UCASE_MIN_DELTA (-UCASE_MAX_DELTA-1)
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#define UCASE_GET_DELTA(props) ((int16_t)(props)>>UCASE_DELTA_SHIFT)
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/* case-ignorable uses one of the delta bits, see gencase/store.c */
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#define UCASE_CASE_IGNORABLE 0x40
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/* exception: bits 15..4 are an unsigned 12-bit index into the exceptions array */
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#define UCASE_EXC_SHIFT 4
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#define UCASE_EXC_MASK 0xfff0
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#define UCASE_MAX_EXCEPTIONS 0x1000
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/* definitions for 16-bit main exceptions word ------------------------------ */
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/* first 8 bits indicate values in optional slots */
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enum {
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UCASE_EXC_LOWER,
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UCASE_EXC_FOLD,
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UCASE_EXC_UPPER,
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UCASE_EXC_TITLE,
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UCASE_EXC_4, /* reserved */
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UCASE_EXC_5, /* reserved */
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UCASE_EXC_CLOSURE,
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UCASE_EXC_FULL_MAPPINGS,
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UCASE_EXC_ALL_SLOTS /* one past the last slot */
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};
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/* each slot is 2 uint16_t instead of 1 */
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#define UCASE_EXC_DOUBLE_SLOTS 0x100
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/* reserved: exception bits 11..9 */
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/* UCASE_EXC_DOT_MASK=UCASE_DOT_MASK<<UCASE_EXC_DOT_SHIFT */
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#define UCASE_EXC_DOT_SHIFT 8
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/* normally stored in the main word, but pushed out for larger exception indexes */
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#define UCASE_EXC_DOT_MASK 0x3000
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enum {
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UCASE_EXC_NO_DOT=0,
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UCASE_EXC_SOFT_DOTTED=0x1000,
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UCASE_EXC_ABOVE=0x2000, /* "above" accents with cc=230 */
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UCASE_EXC_OTHER_ACCENT=0x3000 /* other character (0<cc!=230) */
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};
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/* complex/conditional mappings */
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#define UCASE_EXC_CONDITIONAL_SPECIAL 0x4000
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#define UCASE_EXC_CONDITIONAL_FOLD 0x8000
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/* definitions for lengths word for full case mappings */
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#define UCASE_FULL_LOWER 0xf
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#define UCASE_FULL_FOLDING 0xf0
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#define UCASE_FULL_UPPER 0xf00
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#define UCASE_FULL_TITLE 0xf000
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/* maximum lengths */
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#define UCASE_FULL_MAPPINGS_MAX_LENGTH (4*0xf)
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#define UCASE_CLOSURE_MAX_LENGTH 0xf
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/* constants for reverse case folding ("unfold") data */
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enum {
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UCASE_UNFOLD_ROWS,
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UCASE_UNFOLD_ROW_WIDTH,
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UCASE_UNFOLD_STRING_WIDTH
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};
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U_CDECL_END
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#endif
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