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scuffed-code/icu4c/source/common/unicode/unorm2.h
Markus Scherer 06a03303cb ICU-13234 collect string & character options bits in new stringoptions.h 
X-SVN-Rev: 40162
2017-06-08 20:35:40 +00:00

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 2009-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: unorm2.h
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:4
*
* created on: 2009dec15
* created by: Markus W. Scherer
*/
#ifndef __UNORM2_H__
#define __UNORM2_H__
/**
* \file
* \brief C API: New API for Unicode Normalization.
*
* Unicode normalization functionality for standard Unicode normalization or
* for using custom mapping tables.
* All instances of UNormalizer2 are unmodifiable/immutable.
* Instances returned by unorm2_getInstance() are singletons that must not be deleted by the caller.
* For more details see the Normalizer2 C++ class.
*/
#include "unicode/utypes.h"
#include "unicode/localpointer.h"
#include "unicode/stringoptions.h"
#include "unicode/uset.h"
/**
* Constants for normalization modes.
* For details about standard Unicode normalization forms
* and about the algorithms which are also used with custom mapping tables
* see http://www.unicode.org/unicode/reports/tr15/
* @stable ICU 4.4
*/
typedef enum {
/**
* Decomposition followed by composition.
* Same as standard NFC when using an "nfc" instance.
* Same as standard NFKC when using an "nfkc" instance.
* For details about standard Unicode normalization forms
* see http://www.unicode.org/unicode/reports/tr15/
* @stable ICU 4.4
*/
UNORM2_COMPOSE,
/**
* Map, and reorder canonically.
* Same as standard NFD when using an "nfc" instance.
* Same as standard NFKD when using an "nfkc" instance.
* For details about standard Unicode normalization forms
* see http://www.unicode.org/unicode/reports/tr15/
* @stable ICU 4.4
*/
UNORM2_DECOMPOSE,
/**
* "Fast C or D" form.
* If a string is in this form, then further decomposition <i>without reordering</i>
* would yield the same form as DECOMPOSE.
* Text in "Fast C or D" form can be processed efficiently with data tables
* that are "canonically closed", that is, that provide equivalent data for
* equivalent text, without having to be fully normalized.
* Not a standard Unicode normalization form.
* Not a unique form: Different FCD strings can be canonically equivalent.
* For details see http://www.unicode.org/notes/tn5/#FCD
* @stable ICU 4.4
*/
UNORM2_FCD,
/**
* Compose only contiguously.
* Also known as "FCC" or "Fast C Contiguous".
* The result will often but not always be in NFC.
* The result will conform to FCD which is useful for processing.
* Not a standard Unicode normalization form.
* For details see http://www.unicode.org/notes/tn5/#FCC
* @stable ICU 4.4
*/
UNORM2_COMPOSE_CONTIGUOUS
} UNormalization2Mode;
/**
* Result values for normalization quick check functions.
* For details see http://www.unicode.org/reports/tr15/#Detecting_Normalization_Forms
* @stable ICU 2.0
*/
typedef enum UNormalizationCheckResult {
/**
* The input string is not in the normalization form.
* @stable ICU 2.0
*/
UNORM_NO,
/**
* The input string is in the normalization form.
* @stable ICU 2.0
*/
UNORM_YES,
/**
* The input string may or may not be in the normalization form.
* This value is only returned for composition forms like NFC and FCC,
* when a backward-combining character is found for which the surrounding text
* would have to be analyzed further.
* @stable ICU 2.0
*/
UNORM_MAYBE
} UNormalizationCheckResult;
/**
* Opaque C service object type for the new normalization API.
* @stable ICU 4.4
*/
struct UNormalizer2;
typedef struct UNormalizer2 UNormalizer2; /**< C typedef for struct UNormalizer2. @stable ICU 4.4 */
#if !UCONFIG_NO_NORMALIZATION
/**
* Returns a UNormalizer2 instance for Unicode NFC normalization.
* Same as unorm2_getInstance(NULL, "nfc", UNORM2_COMPOSE, pErrorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the requested Normalizer2, if successful
* @stable ICU 49
*/
U_STABLE const UNormalizer2 * U_EXPORT2
unorm2_getNFCInstance(UErrorCode *pErrorCode);
/**
* Returns a UNormalizer2 instance for Unicode NFD normalization.
* Same as unorm2_getInstance(NULL, "nfc", UNORM2_DECOMPOSE, pErrorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the requested Normalizer2, if successful
* @stable ICU 49
*/
U_STABLE const UNormalizer2 * U_EXPORT2
unorm2_getNFDInstance(UErrorCode *pErrorCode);
/**
* Returns a UNormalizer2 instance for Unicode NFKC normalization.
* Same as unorm2_getInstance(NULL, "nfkc", UNORM2_COMPOSE, pErrorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the requested Normalizer2, if successful
* @stable ICU 49
*/
U_STABLE const UNormalizer2 * U_EXPORT2
unorm2_getNFKCInstance(UErrorCode *pErrorCode);
/**
* Returns a UNormalizer2 instance for Unicode NFKD normalization.
* Same as unorm2_getInstance(NULL, "nfkc", UNORM2_DECOMPOSE, pErrorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the requested Normalizer2, if successful
* @stable ICU 49
*/
U_STABLE const UNormalizer2 * U_EXPORT2
unorm2_getNFKDInstance(UErrorCode *pErrorCode);
/**
* Returns a UNormalizer2 instance for Unicode NFKC_Casefold normalization.
* Same as unorm2_getInstance(NULL, "nfkc_cf", UNORM2_COMPOSE, pErrorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the requested Normalizer2, if successful
* @stable ICU 49
*/
U_STABLE const UNormalizer2 * U_EXPORT2
unorm2_getNFKCCasefoldInstance(UErrorCode *pErrorCode);
/**
* Returns a UNormalizer2 instance which uses the specified data file
* (packageName/name similar to ucnv_openPackage() and ures_open()/ResourceBundle)
* and which composes or decomposes text according to the specified mode.
* Returns an unmodifiable singleton instance. Do not delete it.
*
* Use packageName=NULL for data files that are part of ICU's own data.
* Use name="nfc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFC/NFD.
* Use name="nfkc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFKC/NFKD.
* Use name="nfkc_cf" and UNORM2_COMPOSE for Unicode standard NFKC_CF=NFKC_Casefold.
*
* @param packageName NULL for ICU built-in data, otherwise application data package name
* @param name "nfc" or "nfkc" or "nfkc_cf" or name of custom data file
* @param mode normalization mode (compose or decompose etc.)
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the requested UNormalizer2, if successful
* @stable ICU 4.4
*/
U_STABLE const UNormalizer2 * U_EXPORT2
unorm2_getInstance(const char *packageName,
const char *name,
UNormalization2Mode mode,
UErrorCode *pErrorCode);
/**
* Constructs a filtered normalizer wrapping any UNormalizer2 instance
* and a filter set.
* Both are aliased and must not be modified or deleted while this object
* is used.
* The filter set should be frozen; otherwise the performance will suffer greatly.
* @param norm2 wrapped UNormalizer2 instance
* @param filterSet USet which determines the characters to be normalized
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the requested UNormalizer2, if successful
* @stable ICU 4.4
*/
U_STABLE UNormalizer2 * U_EXPORT2
unorm2_openFiltered(const UNormalizer2 *norm2, const USet *filterSet, UErrorCode *pErrorCode);
/**
* Closes a UNormalizer2 instance from unorm2_openFiltered().
* Do not close instances from unorm2_getInstance()!
* @param norm2 UNormalizer2 instance to be closed
* @stable ICU 4.4
*/
U_STABLE void U_EXPORT2
unorm2_close(UNormalizer2 *norm2);
#if U_SHOW_CPLUSPLUS_API
U_NAMESPACE_BEGIN
/**
* \class LocalUNormalizer2Pointer
* "Smart pointer" class, closes a UNormalizer2 via unorm2_close().
* For most methods see the LocalPointerBase base class.
*
* @see LocalPointerBase
* @see LocalPointer
* @stable ICU 4.4
*/
U_DEFINE_LOCAL_OPEN_POINTER(LocalUNormalizer2Pointer, UNormalizer2, unorm2_close);
U_NAMESPACE_END
#endif
/**
* Writes the normalized form of the source string to the destination string
* (replacing its contents) and returns the length of the destination string.
* The source and destination strings must be different buffers.
* @param norm2 UNormalizer2 instance
* @param src source string
* @param length length of the source string, or -1 if NUL-terminated
* @param dest destination string; its contents is replaced with normalized src
* @param capacity number of UChars that can be written to dest
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return dest
* @stable ICU 4.4
*/
U_STABLE int32_t U_EXPORT2
unorm2_normalize(const UNormalizer2 *norm2,
const UChar *src, int32_t length,
UChar *dest, int32_t capacity,
UErrorCode *pErrorCode);
/**
* Appends the normalized form of the second string to the first string
* (merging them at the boundary) and returns the length of the first string.
* The result is normalized if the first string was normalized.
* The first and second strings must be different buffers.
* @param norm2 UNormalizer2 instance
* @param first string, should be normalized
* @param firstLength length of the first string, or -1 if NUL-terminated
* @param firstCapacity number of UChars that can be written to first
* @param second string, will be normalized
* @param secondLength length of the source string, or -1 if NUL-terminated
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return first
* @stable ICU 4.4
*/
U_STABLE int32_t U_EXPORT2
unorm2_normalizeSecondAndAppend(const UNormalizer2 *norm2,
UChar *first, int32_t firstLength, int32_t firstCapacity,
const UChar *second, int32_t secondLength,
UErrorCode *pErrorCode);
/**
* Appends the second string to the first string
* (merging them at the boundary) and returns the length of the first string.
* The result is normalized if both the strings were normalized.
* The first and second strings must be different buffers.
* @param norm2 UNormalizer2 instance
* @param first string, should be normalized
* @param firstLength length of the first string, or -1 if NUL-terminated
* @param firstCapacity number of UChars that can be written to first
* @param second string, should be normalized
* @param secondLength length of the source string, or -1 if NUL-terminated
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return first
* @stable ICU 4.4
*/
U_STABLE int32_t U_EXPORT2
unorm2_append(const UNormalizer2 *norm2,
UChar *first, int32_t firstLength, int32_t firstCapacity,
const UChar *second, int32_t secondLength,
UErrorCode *pErrorCode);
/**
* Gets the decomposition mapping of c.
* Roughly equivalent to normalizing the String form of c
* on a UNORM2_DECOMPOSE UNormalizer2 instance, but much faster, and except that this function
* returns a negative value and does not write a string
* if c does not have a decomposition mapping in this instance's data.
* This function is independent of the mode of the UNormalizer2.
* @param norm2 UNormalizer2 instance
* @param c code point
* @param decomposition String buffer which will be set to c's
* decomposition mapping, if there is one.
* @param capacity number of UChars that can be written to decomposition
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the non-negative length of c's decomposition, if there is one; otherwise a negative value
* @stable ICU 4.6
*/
U_STABLE int32_t U_EXPORT2
unorm2_getDecomposition(const UNormalizer2 *norm2,
UChar32 c, UChar *decomposition, int32_t capacity,
UErrorCode *pErrorCode);
/**
* Gets the raw decomposition mapping of c.
*
* This is similar to the unorm2_getDecomposition() function but returns the
* raw decomposition mapping as specified in UnicodeData.txt or
* (for custom data) in the mapping files processed by the gennorm2 tool.
* By contrast, unorm2_getDecomposition() returns the processed,
* recursively-decomposed version of this mapping.
*
* When used on a standard NFKC Normalizer2 instance,
* unorm2_getRawDecomposition() returns the Unicode Decomposition_Mapping (dm) property.
*
* When used on a standard NFC Normalizer2 instance,
* it returns the Decomposition_Mapping only if the Decomposition_Type (dt) is Canonical (Can);
* in this case, the result contains either one or two code points (=1..4 UChars).
*
* This function is independent of the mode of the UNormalizer2.
* @param norm2 UNormalizer2 instance
* @param c code point
* @param decomposition String buffer which will be set to c's
* raw decomposition mapping, if there is one.
* @param capacity number of UChars that can be written to decomposition
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return the non-negative length of c's raw decomposition, if there is one; otherwise a negative value
* @stable ICU 49
*/
U_STABLE int32_t U_EXPORT2
unorm2_getRawDecomposition(const UNormalizer2 *norm2,
UChar32 c, UChar *decomposition, int32_t capacity,
UErrorCode *pErrorCode);
/**
* Performs pairwise composition of a & b and returns the composite if there is one.
*
* Returns a composite code point c only if c has a two-way mapping to a+b.
* In standard Unicode normalization, this means that
* c has a canonical decomposition to a+b
* and c does not have the Full_Composition_Exclusion property.
*
* This function is independent of the mode of the UNormalizer2.
* @param norm2 UNormalizer2 instance
* @param a A (normalization starter) code point.
* @param b Another code point.
* @return The non-negative composite code point if there is one; otherwise a negative value.
* @stable ICU 49
*/
U_STABLE UChar32 U_EXPORT2
unorm2_composePair(const UNormalizer2 *norm2, UChar32 a, UChar32 b);
/**
* Gets the combining class of c.
* The default implementation returns 0
* but all standard implementations return the Unicode Canonical_Combining_Class value.
* @param norm2 UNormalizer2 instance
* @param c code point
* @return c's combining class
* @stable ICU 49
*/
U_STABLE uint8_t U_EXPORT2
unorm2_getCombiningClass(const UNormalizer2 *norm2, UChar32 c);
/**
* Tests if the string is normalized.
* Internally, in cases where the quickCheck() method would return "maybe"
* (which is only possible for the two COMPOSE modes) this method
* resolves to "yes" or "no" to provide a definitive result,
* at the cost of doing more work in those cases.
* @param norm2 UNormalizer2 instance
* @param s input string
* @param length length of the string, or -1 if NUL-terminated
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return TRUE if s is normalized
* @stable ICU 4.4
*/
U_STABLE UBool U_EXPORT2
unorm2_isNormalized(const UNormalizer2 *norm2,
const UChar *s, int32_t length,
UErrorCode *pErrorCode);
/**
* Tests if the string is normalized.
* For the two COMPOSE modes, the result could be "maybe" in cases that
* would take a little more work to resolve definitively.
* Use spanQuickCheckYes() and normalizeSecondAndAppend() for a faster
* combination of quick check + normalization, to avoid
* re-checking the "yes" prefix.
* @param norm2 UNormalizer2 instance
* @param s input string
* @param length length of the string, or -1 if NUL-terminated
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return UNormalizationCheckResult
* @stable ICU 4.4
*/
U_STABLE UNormalizationCheckResult U_EXPORT2
unorm2_quickCheck(const UNormalizer2 *norm2,
const UChar *s, int32_t length,
UErrorCode *pErrorCode);
/**
* Returns the end of the normalized substring of the input string.
* In other words, with <code>end=spanQuickCheckYes(s, ec);</code>
* the substring <code>UnicodeString(s, 0, end)</code>
* will pass the quick check with a "yes" result.
*
* The returned end index is usually one or more characters before the
* "no" or "maybe" character: The end index is at a normalization boundary.
* (See the class documentation for more about normalization boundaries.)
*
* When the goal is a normalized string and most input strings are expected
* to be normalized already, then call this method,
* and if it returns a prefix shorter than the input string,
* copy that prefix and use normalizeSecondAndAppend() for the remainder.
* @param norm2 UNormalizer2 instance
* @param s input string
* @param length length of the string, or -1 if NUL-terminated
* @param pErrorCode Standard ICU error code. Its input value must
* pass the U_SUCCESS() test, or else the function returns
* immediately. Check for U_FAILURE() on output or use with
* function chaining. (See User Guide for details.)
* @return "yes" span end index
* @stable ICU 4.4
*/
U_STABLE int32_t U_EXPORT2
unorm2_spanQuickCheckYes(const UNormalizer2 *norm2,
const UChar *s, int32_t length,
UErrorCode *pErrorCode);
/**
* Tests if the character always has a normalization boundary before it,
* regardless of context.
* For details see the Normalizer2 base class documentation.
* @param norm2 UNormalizer2 instance
* @param c character to test
* @return TRUE if c has a normalization boundary before it
* @stable ICU 4.4
*/
U_STABLE UBool U_EXPORT2
unorm2_hasBoundaryBefore(const UNormalizer2 *norm2, UChar32 c);
/**
* Tests if the character always has a normalization boundary after it,
* regardless of context.
* For details see the Normalizer2 base class documentation.
* @param norm2 UNormalizer2 instance
* @param c character to test
* @return TRUE if c has a normalization boundary after it
* @stable ICU 4.4
*/
U_STABLE UBool U_EXPORT2
unorm2_hasBoundaryAfter(const UNormalizer2 *norm2, UChar32 c);
/**
* Tests if the character is normalization-inert.
* For details see the Normalizer2 base class documentation.
* @param norm2 UNormalizer2 instance
* @param c character to test
* @return TRUE if c is normalization-inert
* @stable ICU 4.4
*/
U_STABLE UBool U_EXPORT2
unorm2_isInert(const UNormalizer2 *norm2, UChar32 c);
/**
* Compares two strings for canonical equivalence.
* Further options include case-insensitive comparison and
* code point order (as opposed to code unit order).
*
* Canonical equivalence between two strings is defined as their normalized
* forms (NFD or NFC) being identical.
* This function compares strings incrementally instead of normalizing
* (and optionally case-folding) both strings entirely,
* improving performance significantly.
*
* Bulk normalization is only necessary if the strings do not fulfill the FCD
* conditions. Only in this case, and only if the strings are relatively long,
* is memory allocated temporarily.
* For FCD strings and short non-FCD strings there is no memory allocation.
*
* Semantically, this is equivalent to
* strcmp[CodePointOrder](NFD(foldCase(NFD(s1))), NFD(foldCase(NFD(s2))))
* where code point order and foldCase are all optional.
*
* UAX 21 2.5 Caseless Matching specifies that for a canonical caseless match
* the case folding must be performed first, then the normalization.
*
* @param s1 First source string.
* @param length1 Length of first source string, or -1 if NUL-terminated.
*
* @param s2 Second source string.
* @param length2 Length of second source string, or -1 if NUL-terminated.
*
* @param options A bit set of options:
* - U_FOLD_CASE_DEFAULT or 0 is used for default options:
* Case-sensitive comparison in code unit order, and the input strings
* are quick-checked for FCD.
*
* - UNORM_INPUT_IS_FCD
* Set if the caller knows that both s1 and s2 fulfill the FCD conditions.
* If not set, the function will quickCheck for FCD
* and normalize if necessary.
*
* - U_COMPARE_CODE_POINT_ORDER
* Set to choose code point order instead of code unit order
* (see u_strCompare for details).
*
* - U_COMPARE_IGNORE_CASE
* Set to compare strings case-insensitively using case folding,
* instead of case-sensitively.
* If set, then the following case folding options are used.
*
* - Options as used with case-insensitive comparisons, currently:
*
* - U_FOLD_CASE_EXCLUDE_SPECIAL_I
* (see u_strCaseCompare for details)
*
* - regular normalization options shifted left by UNORM_COMPARE_NORM_OPTIONS_SHIFT
*
* @param pErrorCode ICU error code in/out parameter.
* Must fulfill U_SUCCESS before the function call.
* @return <0 or 0 or >0 as usual for string comparisons
*
* @see unorm_normalize
* @see UNORM_FCD
* @see u_strCompare
* @see u_strCaseCompare
*
* @stable ICU 2.2
*/
U_STABLE int32_t U_EXPORT2
unorm_compare(const UChar *s1, int32_t length1,
const UChar *s2, int32_t length2,
uint32_t options,
UErrorCode *pErrorCode);
#endif /* !UCONFIG_NO_NORMALIZATION */
#endif /* __UNORM2_H__ */
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