/* ******************************************************************** * COPYRIGHT: * Copyright (c) 1996-2011, International Business Machines Corporation and * others. All Rights Reserved. ******************************************************************** */ #ifndef NORMLZR_H #define NORMLZR_H #include "unicode/utypes.h" /** * \file * \brief C++ API: Unicode Normalization */ #if !UCONFIG_NO_NORMALIZATION #include "unicode/chariter.h" #include "unicode/normalizer2.h" #include "unicode/unistr.h" #include "unicode/unorm.h" #include "unicode/uobject.h" U_NAMESPACE_BEGIN /** * The Normalizer class supports the standard normalization forms described in * <a href="http://www.unicode.org/unicode/reports/tr15/" target="unicode"> * Unicode Standard Annex #15: Unicode Normalization Forms</a>. * * Note: This API has been replaced by the Normalizer2 class and is only available * for backward compatibility. This class simply delegates to the Normalizer2 class. * There is one exception: The new API does not provide a replacement for Normalizer::compare(). * * The Normalizer class consists of two parts: * - static functions that normalize strings or test if strings are normalized * - a Normalizer object is an iterator that takes any kind of text and * provides iteration over its normalized form * * The Normalizer class is not suitable for subclassing. * * For basic information about normalization forms and details about the C API * please see the documentation in unorm.h. * * The iterator API with the Normalizer constructors and the non-static functions * use a CharacterIterator as input. It is possible to pass a string which * is then internally wrapped in a CharacterIterator. * The input text is not normalized all at once, but incrementally where needed * (providing efficient random access). * This allows to pass in a large text but spend only a small amount of time * normalizing a small part of that text. * However, if the entire text is normalized, then the iterator will be * slower than normalizing the entire text at once and iterating over the result. * A possible use of the Normalizer iterator is also to report an index into the * original text that is close to where the normalized characters come from. * * <em>Important:</em> The iterator API was cleaned up significantly for ICU 2.0. * The earlier implementation reported the getIndex() inconsistently, * and previous() could not be used after setIndex(), next(), first(), and current(). * * Normalizer allows to start normalizing from anywhere in the input text by * calling setIndexOnly(), first(), or last(). * Without calling any of these, the iterator will start at the beginning of the text. * * At any time, next() returns the next normalized code point (UChar32), * with post-increment semantics (like CharacterIterator::next32PostInc()). * previous() returns the previous normalized code point (UChar32), * with pre-decrement semantics (like CharacterIterator::previous32()). * * current() returns the current code point * (respectively the one at the newly set index) without moving * the getIndex(). Note that if the text at the current position * needs to be normalized, then these functions will do that. * (This is why current() is not const.) * It is more efficient to call setIndexOnly() instead, which does not * normalize. * * getIndex() always refers to the position in the input text where the normalized * code points are returned from. It does not always change with each returned * code point. * The code point that is returned from any of the functions * corresponds to text at or after getIndex(), according to the * function's iteration semantics (post-increment or pre-decrement). * * next() returns a code point from at or after the getIndex() * from before the next() call. After the next() call, the getIndex() * might have moved to where the next code point will be returned from * (from a next() or current() call). * This is semantically equivalent to array access with array[index++] * (post-increment semantics). * * previous() returns a code point from at or after the getIndex() * from after the previous() call. * This is semantically equivalent to array access with array[--index] * (pre-decrement semantics). * * Internally, the Normalizer iterator normalizes a small piece of text * starting at the getIndex() and ending at a following "safe" index. * The normalized results is stored in an internal string buffer, and * the code points are iterated from there. * With multiple iteration calls, this is repeated until the next piece * of text needs to be normalized, and the getIndex() needs to be moved. * * The following "safe" index, the internal buffer, and the secondary * iteration index into that buffer are not exposed on the API. * This also means that it is currently not practical to return to * a particular, arbitrary position in the text because one would need to * know, and be able to set, in addition to the getIndex(), at least also the * current index into the internal buffer. * It is currently only possible to observe when getIndex() changes * (with careful consideration of the iteration semantics), * at which time the internal index will be 0. * For example, if getIndex() is different after next() than before it, * then the internal index is 0 and one can return to this getIndex() * later with setIndexOnly(). * * Note: While the setIndex() and getIndex() refer to indices in the * underlying Unicode input text, the next() and previous() methods * iterate through characters in the normalized output. * This means that there is not necessarily a one-to-one correspondence * between characters returned by next() and previous() and the indices * passed to and returned from setIndex() and getIndex(). * It is for this reason that Normalizer does not implement the CharacterIterator interface. * * @author Laura Werner, Mark Davis, Markus Scherer * @stable ICU 2.0 */ class U_COMMON_API Normalizer : public UObject { public: /** * If DONE is returned from an iteration function that returns a code point, * then there are no more normalization results available. * @stable ICU 2.0 */ enum { DONE=0xffff }; // Constructors /** * Creates a new <code>Normalizer</code> object for iterating over the * normalized form of a given string. * <p> * @param str The string to be normalized. The normalization * will start at the beginning of the string. * * @param mode The normalization mode. * @stable ICU 2.0 */ Normalizer(const UnicodeString& str, UNormalizationMode mode); /** * Creates a new <code>Normalizer</code> object for iterating over the * normalized form of a given string. * <p> * @param str The string to be normalized. The normalization * will start at the beginning of the string. * * @param length Length of the string, or -1 if NUL-terminated. * @param mode The normalization mode. * @stable ICU 2.0 */ Normalizer(const UChar* str, int32_t length, UNormalizationMode mode); /** * Creates a new <code>Normalizer</code> object for iterating over the * normalized form of the given text. * <p> * @param iter The input text to be normalized. The normalization * will start at the beginning of the string. * * @param mode The normalization mode. * @stable ICU 2.0 */ Normalizer(const CharacterIterator& iter, UNormalizationMode mode); /** * Copy constructor. * @param copy The object to be copied. * @stable ICU 2.0 */ Normalizer(const Normalizer& copy); /** * Destructor * @stable ICU 2.0 */ virtual ~Normalizer(); //------------------------------------------------------------------------- // Static utility methods //------------------------------------------------------------------------- /** * Normalizes a <code>UnicodeString</code> according to the specified normalization mode. * This is a wrapper for unorm_normalize(), using UnicodeString's. * * The <code>options</code> parameter specifies which optional * <code>Normalizer</code> features are to be enabled for this operation. * * @param source the input string to be normalized. * @param mode the normalization mode * @param options the optional features to be enabled (0 for no options) * @param result The normalized string (on output). * @param status The error code. * @stable ICU 2.0 */ static void U_EXPORT2 normalize(const UnicodeString& source, UNormalizationMode mode, int32_t options, UnicodeString& result, UErrorCode &status); /** * Compose a <code>UnicodeString</code>. * This is equivalent to normalize() with mode UNORM_NFC or UNORM_NFKC. * This is a wrapper for unorm_normalize(), using UnicodeString's. * * The <code>options</code> parameter specifies which optional * <code>Normalizer</code> features are to be enabled for this operation. * * @param source the string to be composed. * @param compat Perform compatibility decomposition before composition. * If this argument is <code>FALSE</code>, only canonical * decomposition will be performed. * @param options the optional features to be enabled (0 for no options) * @param result The composed string (on output). * @param status The error code. * @stable ICU 2.0 */ static void U_EXPORT2 compose(const UnicodeString& source, UBool compat, int32_t options, UnicodeString& result, UErrorCode &status); /** * Static method to decompose a <code>UnicodeString</code>. * This is equivalent to normalize() with mode UNORM_NFD or UNORM_NFKD. * This is a wrapper for unorm_normalize(), using UnicodeString's. * * The <code>options</code> parameter specifies which optional * <code>Normalizer</code> features are to be enabled for this operation. * * @param source the string to be decomposed. * @param compat Perform compatibility decomposition. * If this argument is <code>FALSE</code>, only canonical * decomposition will be performed. * @param options the optional features to be enabled (0 for no options) * @param result The decomposed string (on output). * @param status The error code. * @stable ICU 2.0 */ static void U_EXPORT2 decompose(const UnicodeString& source, UBool compat, int32_t options, UnicodeString& result, UErrorCode &status); /** * Performing quick check on a string, to quickly determine if the string is * in a particular normalization format. * This is a wrapper for unorm_quickCheck(), using a UnicodeString. * * Three types of result can be returned UNORM_YES, UNORM_NO or * UNORM_MAYBE. Result UNORM_YES indicates that the argument * string is in the desired normalized format, UNORM_NO determines that * argument string is not in the desired normalized format. A * UNORM_MAYBE result indicates that a more thorough check is required, * the user may have to put the string in its normalized form and compare the * results. * @param source string for determining if it is in a normalized format * @param mode normalization format * @param status A reference to a UErrorCode to receive any errors * @return UNORM_YES, UNORM_NO or UNORM_MAYBE * * @see isNormalized * @stable ICU 2.0 */ static inline UNormalizationCheckResult quickCheck(const UnicodeString &source, UNormalizationMode mode, UErrorCode &status); /** * Performing quick check on a string; same as the other version of quickCheck * but takes an extra options parameter like most normalization functions. * * @param source string for determining if it is in a normalized format * @param mode normalization format * @param options the optional features to be enabled (0 for no options) * @param status A reference to a UErrorCode to receive any errors * @return UNORM_YES, UNORM_NO or UNORM_MAYBE * * @see isNormalized * @stable ICU 2.6 */ static UNormalizationCheckResult quickCheck(const UnicodeString &source, UNormalizationMode mode, int32_t options, UErrorCode &status); /** * Test if a string is in a given normalization form. * This is semantically equivalent to source.equals(normalize(source, mode)) . * * Unlike unorm_quickCheck(), this function returns a definitive result, * never a "maybe". * For NFD, NFKD, and FCD, both functions work exactly the same. * For NFC and NFKC where quickCheck may return "maybe", this function will * perform further tests to arrive at a TRUE/FALSE result. * * @param src String that is to be tested if it is in a normalization format. * @param mode Which normalization form to test for. * @param errorCode ICU error code in/out parameter. * Must fulfill U_SUCCESS before the function call. * @return Boolean value indicating whether the source string is in the * "mode" normalization form. * * @see quickCheck * @stable ICU 2.2 */ static inline UBool isNormalized(const UnicodeString &src, UNormalizationMode mode, UErrorCode &errorCode); /** * Test if a string is in a given normalization form; same as the other version of isNormalized * but takes an extra options parameter like most normalization functions. * * @param src String that is to be tested if it is in a normalization format. * @param mode Which normalization form to test for. * @param options the optional features to be enabled (0 for no options) * @param errorCode ICU error code in/out parameter. * Must fulfill U_SUCCESS before the function call. * @return Boolean value indicating whether the source string is in the * "mode" normalization form. * * @see quickCheck * @stable ICU 2.6 */ static UBool isNormalized(const UnicodeString &src, UNormalizationMode mode, int32_t options, UErrorCode &errorCode); /** * Concatenate normalized strings, making sure that the result is normalized as well. * * If both the left and the right strings are in * the normalization form according to "mode/options", * then the result will be * * \code * dest=normalize(left+right, mode, options) * \endcode * * For details see unorm_concatenate in unorm.h. * * @param left Left source string. * @param right Right source string. * @param result The output string. * @param mode The normalization mode. * @param options A bit set of normalization options. * @param errorCode ICU error code in/out parameter. * Must fulfill U_SUCCESS before the function call. * @return result * * @see unorm_concatenate * @see normalize * @see unorm_next * @see unorm_previous * * @stable ICU 2.1 */ static UnicodeString & U_EXPORT2 concatenate(const UnicodeString &left, const UnicodeString &right, UnicodeString &result, UNormalizationMode mode, int32_t options, UErrorCode &errorCode); /** * Compare 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(s1)), NFD(foldCase(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 s2 Second source string. * * @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 errorCode 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_compare * @see normalize * @see UNORM_FCD * @see u_strCompare * @see u_strCaseCompare * * @stable ICU 2.2 */ static inline int32_t compare(const UnicodeString &s1, const UnicodeString &s2, uint32_t options, UErrorCode &errorCode); //------------------------------------------------------------------------- // Iteration API //------------------------------------------------------------------------- /** * Return the current character in the normalized text. * current() may need to normalize some text at getIndex(). * The getIndex() is not changed. * * @return the current normalized code point * @stable ICU 2.0 */ UChar32 current(void); /** * Return the first character in the normalized text. * This is equivalent to setIndexOnly(startIndex()) followed by next(). * (Post-increment semantics.) * * @return the first normalized code point * @stable ICU 2.0 */ UChar32 first(void); /** * Return the last character in the normalized text. * This is equivalent to setIndexOnly(endIndex()) followed by previous(). * (Pre-decrement semantics.) * * @return the last normalized code point * @stable ICU 2.0 */ UChar32 last(void); /** * Return the next character in the normalized text. * (Post-increment semantics.) * If the end of the text has already been reached, DONE is returned. * The DONE value could be confused with a U+FFFF non-character code point * in the text. If this is possible, you can test getIndex()<endIndex() * before calling next(), or (getIndex()<endIndex() || last()!=DONE) * after calling next(). (Calling last() will change the iterator state!) * * The C API unorm_next() is more efficient and does not have this ambiguity. * * @return the next normalized code point * @stable ICU 2.0 */ UChar32 next(void); /** * Return the previous character in the normalized text and decrement. * (Pre-decrement semantics.) * If the beginning of the text has already been reached, DONE is returned. * The DONE value could be confused with a U+FFFF non-character code point * in the text. If this is possible, you can test * (getIndex()>startIndex() || first()!=DONE). (Calling first() will change * the iterator state!) * * The C API unorm_previous() is more efficient and does not have this ambiguity. * * @return the previous normalized code point * @stable ICU 2.0 */ UChar32 previous(void); /** * Set the iteration position in the input text that is being normalized, * without any immediate normalization. * After setIndexOnly(), getIndex() will return the same index that is * specified here. * * @param index the desired index in the input text. * @stable ICU 2.0 */ void setIndexOnly(int32_t index); /** * Reset the index to the beginning of the text. * This is equivalent to setIndexOnly(startIndex)). * @stable ICU 2.0 */ void reset(void); /** * Retrieve the current iteration position in the input text that is * being normalized. * * A following call to next() will return a normalized code point from * the input text at or after this index. * * After a call to previous(), getIndex() will point at or before the * position in the input text where the normalized code point * was returned from with previous(). * * @return the current index in the input text * @stable ICU 2.0 */ int32_t getIndex(void) const; /** * Retrieve the index of the start of the input text. This is the begin index * of the <code>CharacterIterator</code> or the start (i.e. index 0) of the string * over which this <code>Normalizer</code> is iterating. * * @return the smallest index in the input text where the Normalizer operates * @stable ICU 2.0 */ int32_t startIndex(void) const; /** * Retrieve the index of the end of the input text. This is the end index * of the <code>CharacterIterator</code> or the length of the string * over which this <code>Normalizer</code> is iterating. * This end index is exclusive, i.e., the Normalizer operates only on characters * before this index. * * @return the first index in the input text where the Normalizer does not operate * @stable ICU 2.0 */ int32_t endIndex(void) const; /** * Returns TRUE when both iterators refer to the same character in the same * input text. * * @param that a Normalizer object to compare this one to * @return comparison result * @stable ICU 2.0 */ UBool operator==(const Normalizer& that) const; /** * Returns FALSE when both iterators refer to the same character in the same * input text. * * @param that a Normalizer object to compare this one to * @return comparison result * @stable ICU 2.0 */ inline UBool operator!=(const Normalizer& that) const; /** * Returns a pointer to a new Normalizer that is a clone of this one. * The caller is responsible for deleting the new clone. * @return a pointer to a new Normalizer * @stable ICU 2.0 */ Normalizer* clone(void) const; /** * Generates a hash code for this iterator. * * @return the hash code * @stable ICU 2.0 */ int32_t hashCode(void) const; //------------------------------------------------------------------------- // Property access methods //------------------------------------------------------------------------- /** * Set the normalization mode for this object. * <p> * <b>Note:</b>If the normalization mode is changed while iterating * over a string, calls to {@link #next() } and {@link #previous() } may * return previously buffers characters in the old normalization mode * until the iteration is able to re-sync at the next base character. * It is safest to call {@link #setIndexOnly }, {@link #reset() }, * {@link #setText }, {@link #first() }, * {@link #last() }, etc. after calling <code>setMode</code>. * <p> * @param newMode the new mode for this <code>Normalizer</code>. * @see #getUMode * @stable ICU 2.0 */ void setMode(UNormalizationMode newMode); /** * Return the normalization mode for this object. * * This is an unusual name because there used to be a getMode() that * returned a different type. * * @return the mode for this <code>Normalizer</code> * @see #setMode * @stable ICU 2.0 */ UNormalizationMode getUMode(void) const; /** * Set options that affect this <code>Normalizer</code>'s operation. * Options do not change the basic composition or decomposition operation * that is being performed, but they control whether * certain optional portions of the operation are done. * Currently the only available option is obsolete. * * It is possible to specify multiple options that are all turned on or off. * * @param option the option(s) whose value is/are to be set. * @param value the new setting for the option. Use <code>TRUE</code> to * turn the option(s) on and <code>FALSE</code> to turn it/them off. * * @see #getOption * @stable ICU 2.0 */ void setOption(int32_t option, UBool value); /** * Determine whether an option is turned on or off. * If multiple options are specified, then the result is TRUE if any * of them are set. * <p> * @param option the option(s) that are to be checked * @return TRUE if any of the option(s) are set * @see #setOption * @stable ICU 2.0 */ UBool getOption(int32_t option) const; /** * Set the input text over which this <code>Normalizer</code> will iterate. * The iteration position is set to the beginning. * * @param newText a string that replaces the current input text * @param status a UErrorCode * @stable ICU 2.0 */ void setText(const UnicodeString& newText, UErrorCode &status); /** * Set the input text over which this <code>Normalizer</code> will iterate. * The iteration position is set to the beginning. * * @param newText a CharacterIterator object that replaces the current input text * @param status a UErrorCode * @stable ICU 2.0 */ void setText(const CharacterIterator& newText, UErrorCode &status); /** * Set the input text over which this <code>Normalizer</code> will iterate. * The iteration position is set to the beginning. * * @param newText a string that replaces the current input text * @param length the length of the string, or -1 if NUL-terminated * @param status a UErrorCode * @stable ICU 2.0 */ void setText(const UChar* newText, int32_t length, UErrorCode &status); /** * Copies the input text into the UnicodeString argument. * * @param result Receives a copy of the text under iteration. * @stable ICU 2.0 */ void getText(UnicodeString& result); /** * ICU "poor man's RTTI", returns a UClassID for this class. * @returns a UClassID for this class. * @stable ICU 2.2 */ static UClassID U_EXPORT2 getStaticClassID(); /** * ICU "poor man's RTTI", returns a UClassID for the actual class. * @return a UClassID for the actual class. * @stable ICU 2.2 */ virtual UClassID getDynamicClassID() const; private: //------------------------------------------------------------------------- // Private functions //------------------------------------------------------------------------- Normalizer(); // default constructor not implemented Normalizer &operator=(const Normalizer &that); // assignment operator not implemented // Private utility methods for iteration // For documentation, see the source code UBool nextNormalize(); UBool previousNormalize(); void init(); void clearBuffer(void); //------------------------------------------------------------------------- // Private data //------------------------------------------------------------------------- FilteredNormalizer2*fFilteredNorm2; // owned if not NULL const Normalizer2 *fNorm2; // not owned; may be equal to fFilteredNorm2 UNormalizationMode fUMode; int32_t fOptions; // The input text and our position in it CharacterIterator *text; // The normalization buffer is the result of normalization // of the source in [currentIndex..nextIndex[ . int32_t currentIndex, nextIndex; // A buffer for holding intermediate results UnicodeString buffer; int32_t bufferPos; }; //------------------------------------------------------------------------- // Inline implementations //------------------------------------------------------------------------- inline UBool Normalizer::operator!= (const Normalizer& other) const { return ! operator==(other); } inline UNormalizationCheckResult Normalizer::quickCheck(const UnicodeString& source, UNormalizationMode mode, UErrorCode &status) { return quickCheck(source, mode, 0, status); } inline UBool Normalizer::isNormalized(const UnicodeString& source, UNormalizationMode mode, UErrorCode &status) { return isNormalized(source, mode, 0, status); } inline int32_t Normalizer::compare(const UnicodeString &s1, const UnicodeString &s2, uint32_t options, UErrorCode &errorCode) { // all argument checking is done in unorm_compare return unorm_compare(s1.getBuffer(), s1.length(), s2.getBuffer(), s2.length(), options, &errorCode); } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_NORMALIZATION */ #endif // NORMLZR_H