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/*
*******************************************************************************
*
* Copyright (C) 2009-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: normalizer2.h
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2009nov22
* created by: Markus W. Scherer
*/
#ifndef __NORMALIZER2_H__
#define __NORMALIZER2_H__
/**
* \file
* \brief C++ API: New API for Unicode Normalization.
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_NORMALIZATION
#include "unicode/uniset.h"
#include "unicode/unistr.h"
#include "unicode/unorm2.h"
U_NAMESPACE_BEGIN
/**
* Unicode normalization functionality for standard Unicode normalization or
* for using custom mapping tables.
* All instances of this class are unmodifiable/immutable.
* Instances returned by getInstance() are singletons that must not be deleted by the caller.
* The Normalizer2 class is not intended for public subclassing.
*
* The primary functions are to produce a normalized string and to detect whether
* a string is already normalized.
* The most commonly used normalization forms are those defined in
* http://www.unicode.org/unicode/reports/tr15/
* However, this API supports additional normalization forms for specialized purposes.
* For example, NFKC_Casefold is provided via getInstance("nfkc_cf", COMPOSE)
* and can be used in implementations of UTS #46.
*
* Not only are the standard compose and decompose modes supplied,
* but additional modes are provided as documented in the Mode enum.
*
* Some of the functions in this class identify normalization boundaries.
* At a normalization boundary, the portions of the string
* before it and starting from it do not interact and can be handled independently.
*
* The spanQuickCheckYes() stops at a normalization boundary.
* When the goal is a normalized string, then the text before the boundary
* can be copied, and the remainder can be processed with normalizeSecondAndAppend().
*
* The hasBoundaryBefore(), hasBoundaryAfter() and isInert() functions test whether
* a character is guaranteed to be at a normalization boundary,
* regardless of context.
* This is used for moving from one normalization boundary to the next
* or preceding boundary, and for performing iterative normalization.
*
* Iterative normalization is useful when only a small portion of a
* longer string needs to be processed.
* For example, in ICU, iterative normalization is used by the NormalizationTransliterator
* (to avoid replacing already-normalized text) and ucol_nextSortKeyPart()
* (to process only the substring for which sort key bytes are computed).
*
* The set of normalization boundaries returned by these functions may not be
* complete: There may be more boundaries that could be returned.
* Different functions may return different boundaries.
* @stable ICU 4.4
*/
class U_COMMON_API Normalizer2 : public UObject {
public:
/**
* Destructor.
* @stable ICU 4.4
*/
~Normalizer2();
#ifndef U_HIDE_DRAFT_API
/**
* Returns a Normalizer2 instance for Unicode NFC normalization.
* Same as getInstance(NULL, "nfc", UNORM2_COMPOSE, errorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param errorCode 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
* @draft ICU 49
*/
static const Normalizer2 *
getNFCInstance(UErrorCode &errorCode);
/**
* Returns a Normalizer2 instance for Unicode NFD normalization.
* Same as getInstance(NULL, "nfc", UNORM2_DECOMPOSE, errorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param errorCode 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
* @draft ICU 49
*/
static const Normalizer2 *
getNFDInstance(UErrorCode &errorCode);
/**
* Returns a Normalizer2 instance for Unicode NFKC normalization.
* Same as getInstance(NULL, "nfkc", UNORM2_COMPOSE, errorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param errorCode 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
* @draft ICU 49
*/
static const Normalizer2 *
getNFKCInstance(UErrorCode &errorCode);
/**
* Returns a Normalizer2 instance for Unicode NFKD normalization.
* Same as getInstance(NULL, "nfkc", UNORM2_DECOMPOSE, errorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param errorCode 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
* @draft ICU 49
*/
static const Normalizer2 *
getNFKDInstance(UErrorCode &errorCode);
/**
* Returns a Normalizer2 instance for Unicode NFKC_Casefold normalization.
* Same as getInstance(NULL, "nfkc_cf", UNORM2_COMPOSE, errorCode).
* Returns an unmodifiable singleton instance. Do not delete it.
* @param errorCode 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
* @draft ICU 49
*/
static const Normalizer2 *
getNFKCCasefoldInstance(UErrorCode &errorCode);
#endif /* U_HIDE_DRAFT_API */
/**
* Returns a Normalizer2 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 errorCode 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 4.4
*/
static const Normalizer2 *
getInstance(const char *packageName,
const char *name,
UNormalization2Mode mode,
UErrorCode &errorCode);
/**
* Returns the normalized form of the source string.
* @param src source string
* @param errorCode 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 normalized src
* @stable ICU 4.4
*/
UnicodeString
normalize(const UnicodeString &src, UErrorCode &errorCode) const {
UnicodeString result;
normalize(src, result, errorCode);
return result;
}
/**
* Writes the normalized form of the source string to the destination string
* (replacing its contents) and returns the destination string.
* The source and destination strings must be different objects.
* @param src source string
* @param dest destination string; its contents is replaced with normalized src
* @param errorCode 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
*/
virtual UnicodeString &
normalize(const UnicodeString &src,
UnicodeString &dest,
UErrorCode &errorCode) const = 0;
/**
* Appends the normalized form of the second string to the first string
* (merging them at the boundary) and returns the first string.
* The result is normalized if the first string was normalized.
* The first and second strings must be different objects.
* @param first string, should be normalized
* @param second string, will be normalized
* @param errorCode 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
*/
virtual UnicodeString &
normalizeSecondAndAppend(UnicodeString &first,
const UnicodeString &second,
UErrorCode &errorCode) const = 0;
/**
* Appends the second string to the first string
* (merging them at the boundary) and returns the first string.
* The result is normalized if both the strings were normalized.
* The first and second strings must be different objects.
* @param first string, should be normalized
* @param second string, should be normalized
* @param errorCode 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
*/
virtual UnicodeString &
append(UnicodeString &first,
const UnicodeString &second,
UErrorCode &errorCode) const = 0;
/**
* Gets the decomposition mapping of c.
* Roughly equivalent to normalizing the String form of c
* on a UNORM2_DECOMPOSE Normalizer2 instance, but much faster, and except that this function
* returns FALSE 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 Normalizer2.
* @param c code point
* @param decomposition String object which will be set to c's
* decomposition mapping, if there is one.
* @return TRUE if c has a decomposition, otherwise FALSE
* @stable ICU 4.6
*/
virtual UBool
getDecomposition(UChar32 c, UnicodeString &decomposition) const = 0;
/**
* Gets the raw decomposition mapping of c.
*
* This is similar to the getDecomposition() method 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, getDecomposition() returns the processed,
* recursively-decomposed version of this mapping.
*
* When used on a standard NFKC Normalizer2 instance,
* 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 Normalizer2.
* The default implementation returns FALSE.
* @param c code point
* @param decomposition String object which will be set to c's
* raw decomposition mapping, if there is one.
* @return TRUE if c has a decomposition, otherwise FALSE
* @draft ICU 49
*/
virtual UBool
getRawDecomposition(UChar32 c, UnicodeString &decomposition) const;
/**
* 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 Normalizer2.
* The default implementation returns a negative value.
* @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.
* @draft ICU 49
*/
virtual UChar32
composePair(UChar32 a, UChar32 b) const;
/**
* Gets the combining class of c.
* The default implementation returns 0
* but all standard implementations return the Unicode Canonical_Combining_Class value.
* @param c code point
* @return c's combining class
* @draft ICU 49
*/
virtual uint8_t
getCombiningClass(UChar32 c) const;
/**
* 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 s input string
* @param errorCode 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
*/
virtual UBool
isNormalized(const UnicodeString &s, UErrorCode &errorCode) const = 0;
/**
* 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 s input string
* @param errorCode 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
*/
virtual UNormalizationCheckResult
quickCheck(const UnicodeString &s, UErrorCode &errorCode) const = 0;
/**
* 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 s input string
* @param errorCode 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
*/
virtual int32_t
spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const = 0;
/**
* Tests if the character always has a normalization boundary before it,
* regardless of context.
* If true, then the character does not normalization-interact with
* preceding characters.
* In other words, a string containing this character can be normalized
* by processing portions before this character and starting from this
* character independently.
* This is used for iterative normalization. See the class documentation for details.
* @param c character to test
* @return TRUE if c has a normalization boundary before it
* @stable ICU 4.4
*/
virtual UBool hasBoundaryBefore(UChar32 c) const = 0;
/**
* Tests if the character always has a normalization boundary after it,
* regardless of context.
* If true, then the character does not normalization-interact with
* following characters.
* In other words, a string containing this character can be normalized
* by processing portions up to this character and after this
* character independently.
* This is used for iterative normalization. See the class documentation for details.
* Note that this operation may be significantly slower than hasBoundaryBefore().
* @param c character to test
* @return TRUE if c has a normalization boundary after it
* @stable ICU 4.4
*/
virtual UBool hasBoundaryAfter(UChar32 c) const = 0;
/**
* Tests if the character is normalization-inert.
* If true, then the character does not change, nor normalization-interact with
* preceding or following characters.
* In other words, a string containing this character can be normalized
* by processing portions before this character and after this
* character independently.
* This is used for iterative normalization. See the class documentation for details.
* Note that this operation may be significantly slower than hasBoundaryBefore().
* @param c character to test
* @return TRUE if c is normalization-inert
* @stable ICU 4.4
*/
virtual UBool isInert(UChar32 c) const = 0;
private:
// No ICU "poor man's RTTI" for this class nor its subclasses.
virtual UClassID getDynamicClassID() const;
};
/**
* Normalization filtered by a UnicodeSet.
* Normalizes portions of the text contained in the filter set and leaves
* portions not contained in the filter set unchanged.
* Filtering is done via UnicodeSet::span(..., USET_SPAN_SIMPLE).
* Not-in-the-filter text is treated as "is normalized" and "quick check yes".
* This class implements all of (and only) the Normalizer2 API.
* An instance of this class is unmodifiable/immutable but is constructed and
* must be destructed by the owner.
* @stable ICU 4.4
*/
class U_COMMON_API FilteredNormalizer2 : public Normalizer2 {
public:
/**
* Constructs a filtered normalizer wrapping any Normalizer2 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 n2 wrapped Normalizer2 instance
* @param filterSet UnicodeSet which determines the characters to be normalized
* @stable ICU 4.4
*/
FilteredNormalizer2(const Normalizer2 &n2, const UnicodeSet &filterSet) :
norm2(n2), set(filterSet) {}
/**
* Destructor.
* @stable ICU 4.4
*/
~FilteredNormalizer2();
/**
* Writes the normalized form of the source string to the destination string
* (replacing its contents) and returns the destination string.
* The source and destination strings must be different objects.
* @param src source string
* @param dest destination string; its contents is replaced with normalized src
* @param errorCode 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
*/
virtual UnicodeString &
normalize(const UnicodeString &src,
UnicodeString &dest,
UErrorCode &errorCode) const;
/**
* Appends the normalized form of the second string to the first string
* (merging them at the boundary) and returns the first string.
* The result is normalized if the first string was normalized.
* The first and second strings must be different objects.
* @param first string, should be normalized
* @param second string, will be normalized
* @param errorCode 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
*/
virtual UnicodeString &
normalizeSecondAndAppend(UnicodeString &first,
const UnicodeString &second,
UErrorCode &errorCode) const;
/**
* Appends the second string to the first string
* (merging them at the boundary) and returns the first string.
* The result is normalized if both the strings were normalized.
* The first and second strings must be different objects.
* @param first string, should be normalized
* @param second string, should be normalized
* @param errorCode 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
*/
virtual UnicodeString &
append(UnicodeString &first,
const UnicodeString &second,
UErrorCode &errorCode) const;
/**
* Gets the decomposition mapping of c.
* For details see the base class documentation.
*
* This function is independent of the mode of the Normalizer2.
* @param c code point
* @param decomposition String object which will be set to c's
* decomposition mapping, if there is one.
* @return TRUE if c has a decomposition, otherwise FALSE
* @stable ICU 4.6
*/
virtual UBool
getDecomposition(UChar32 c, UnicodeString &decomposition) const;
/**
* Gets the raw decomposition mapping of c.
* For details see the base class documentation.
*
* This function is independent of the mode of the Normalizer2.
* @param c code point
* @param decomposition String object which will be set to c's
* raw decomposition mapping, if there is one.
* @return TRUE if c has a decomposition, otherwise FALSE
* @draft ICU 49
*/
virtual UBool
getRawDecomposition(UChar32 c, UnicodeString &decomposition) const;
/**
* Performs pairwise composition of a & b and returns the composite if there is one.
* For details see the base class documentation.
*
* This function is independent of the mode of the Normalizer2.
* @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.
* @draft ICU 49
*/
virtual UChar32
composePair(UChar32 a, UChar32 b) const;
/**
* Gets the combining class of c.
* The default implementation returns 0
* but all standard implementations return the Unicode Canonical_Combining_Class value.
* @param c code point
* @return c's combining class
* @draft ICU 49
*/
virtual uint8_t
getCombiningClass(UChar32 c) const;
/**
* Tests if the string is normalized.
* For details see the Normalizer2 base class documentation.
* @param s input string
* @param errorCode 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
*/
virtual UBool
isNormalized(const UnicodeString &s, UErrorCode &errorCode) const;
/**
* Tests if the string is normalized.
* For details see the Normalizer2 base class documentation.
* @param s input string
* @param errorCode 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
*/
virtual UNormalizationCheckResult
quickCheck(const UnicodeString &s, UErrorCode &errorCode) const;
/**
* Returns the end of the normalized substring of the input string.
* For details see the Normalizer2 base class documentation.
* @param s input string
* @param errorCode 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
*/
virtual int32_t
spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const;
/**
* Tests if the character always has a normalization boundary before it,
* regardless of context.
* For details see the Normalizer2 base class documentation.
* @param c character to test
* @return TRUE if c has a normalization boundary before it
* @stable ICU 4.4
*/
virtual UBool hasBoundaryBefore(UChar32 c) const;
/**
* Tests if the character always has a normalization boundary after it,
* regardless of context.
* For details see the Normalizer2 base class documentation.
* @param c character to test
* @return TRUE if c has a normalization boundary after it
* @stable ICU 4.4
*/
virtual UBool hasBoundaryAfter(UChar32 c) const;
/**
* Tests if the character is normalization-inert.
* For details see the Normalizer2 base class documentation.
* @param c character to test
* @return TRUE if c is normalization-inert
* @stable ICU 4.4
*/
virtual UBool isInert(UChar32 c) const;
private:
UnicodeString &
normalize(const UnicodeString &src,
UnicodeString &dest,
USetSpanCondition spanCondition,
UErrorCode &errorCode) const;
UnicodeString &
normalizeSecondAndAppend(UnicodeString &first,
const UnicodeString &second,
UBool doNormalize,
UErrorCode &errorCode) const;
const Normalizer2 &norm2;
const UnicodeSet &set;
};
U_NAMESPACE_END
#endif // !UCONFIG_NO_NORMALIZATION
#endif // __NORMALIZER2_H__