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Edit File: umutablecptrie.h
// © 2017 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html // umutablecptrie.h (split out of ucptrie.h) // created: 2018jan24 Markus W. Scherer #ifndef __UMUTABLECPTRIE_H__ #define __UMUTABLECPTRIE_H__ #include "unicode/utypes.h" #include "unicode/localpointer.h" #include "unicode/ucpmap.h" #include "unicode/ucptrie.h" #include "unicode/utf8.h" U_CDECL_BEGIN /** * \file * * This file defines a mutable Unicode code point trie. * * @see UCPTrie * @see UMutableCPTrie */ /** * Mutable Unicode code point trie. * Fast map from Unicode code points (U+0000..U+10FFFF) to 32-bit integer values. * For details see http://site.icu-project.org/design/struct/utrie * * Setting values (especially ranges) and lookup is fast. * The mutable trie is only somewhat space-efficient. * It builds a compacted, immutable UCPTrie. * * This trie can be modified while iterating over its contents. * For example, it is possible to merge its values with those from another * set of ranges (e.g., another mutable or immutable trie): * Iterate over those source ranges; for each of them iterate over this trie; * add the source value into the value of each trie range. * * @see UCPTrie * @see umutablecptrie_buildImmutable * @stable ICU 63 */ typedef struct UMutableCPTrie UMutableCPTrie; /** * Creates a mutable trie that initially maps each Unicode code point to the same value. * It uses 32-bit data values until umutablecptrie_buildImmutable() is called. * umutablecptrie_buildImmutable() takes a valueWidth parameter which * determines the number of bits in the data value in the resulting UCPTrie. * You must umutablecptrie_close() the trie once you are done using it. * * @param initialValue the initial value that is set for all code points * @param errorValue the value for out-of-range code points and ill-formed UTF-8/16 * @param pErrorCode an in/out ICU UErrorCode * @return the trie * @stable ICU 63 */ U_CAPI UMutableCPTrie * U_EXPORT2 umutablecptrie_open(uint32_t initialValue, uint32_t errorValue, UErrorCode *pErrorCode); /** * Clones a mutable trie. * You must umutablecptrie_close() the clone once you are done using it. * * @param other the trie to clone * @param pErrorCode an in/out ICU UErrorCode * @return the trie clone * @stable ICU 63 */ U_CAPI UMutableCPTrie * U_EXPORT2 umutablecptrie_clone(const UMutableCPTrie *other, UErrorCode *pErrorCode); /** * Closes a mutable trie and releases associated memory. * * @param trie the trie * @stable ICU 63 */ U_CAPI void U_EXPORT2 umutablecptrie_close(UMutableCPTrie *trie); /** * Creates a mutable trie with the same contents as the UCPMap. * You must umutablecptrie_close() the mutable trie once you are done using it. * * @param map the source map * @param pErrorCode an in/out ICU UErrorCode * @return the mutable trie * @stable ICU 63 */ U_CAPI UMutableCPTrie * U_EXPORT2 umutablecptrie_fromUCPMap(const UCPMap *map, UErrorCode *pErrorCode); /** * Creates a mutable trie with the same contents as the immutable one. * You must umutablecptrie_close() the mutable trie once you are done using it. * * @param trie the immutable trie * @param pErrorCode an in/out ICU UErrorCode * @return the mutable trie * @stable ICU 63 */ U_CAPI UMutableCPTrie * U_EXPORT2 umutablecptrie_fromUCPTrie(const UCPTrie *trie, UErrorCode *pErrorCode); /** * Returns the value for a code point as stored in the trie. * * @param trie the trie * @param c the code point * @return the value * @stable ICU 63 */ U_CAPI uint32_t U_EXPORT2 umutablecptrie_get(const UMutableCPTrie *trie, UChar32 c); /** * Returns the last code point such that all those from start to there have the same value. * Can be used to efficiently iterate over all same-value ranges in a trie. * (This is normally faster than iterating over code points and get()ting each value, * but much slower than a data structure that stores ranges directly.) * * The trie can be modified between calls to this function. * * If the UCPMapValueFilter function pointer is not NULL, then * the value to be delivered is passed through that function, and the return value is the end * of the range where all values are modified to the same actual value. * The value is unchanged if that function pointer is NULL. * * See the same-signature ucptrie_getRange() for a code sample. * * @param trie the trie * @param start range start * @param option defines whether surrogates are treated normally, * or as having the surrogateValue; usually UCPMAP_RANGE_NORMAL * @param surrogateValue value for surrogates; ignored if option==UCPMAP_RANGE_NORMAL * @param filter a pointer to a function that may modify the trie data value, * or NULL if the values from the trie are to be used unmodified * @param context an opaque pointer that is passed on to the filter function * @param pValue if not NULL, receives the value that every code point start..end has; * may have been modified by filter(context, trie value) * if that function pointer is not NULL * @return the range end code point, or -1 if start is not a valid code point * @stable ICU 63 */ U_CAPI UChar32 U_EXPORT2 umutablecptrie_getRange(const UMutableCPTrie *trie, UChar32 start, UCPMapRangeOption option, uint32_t surrogateValue, UCPMapValueFilter *filter, const void *context, uint32_t *pValue); /** * Sets a value for a code point. * * @param trie the trie * @param c the code point * @param value the value * @param pErrorCode an in/out ICU UErrorCode * @stable ICU 63 */ U_CAPI void U_EXPORT2 umutablecptrie_set(UMutableCPTrie *trie, UChar32 c, uint32_t value, UErrorCode *pErrorCode); /** * Sets a value for each code point [start..end]. * Faster and more space-efficient than setting the value for each code point separately. * * @param trie the trie * @param start the first code point to get the value * @param end the last code point to get the value (inclusive) * @param value the value * @param pErrorCode an in/out ICU UErrorCode * @stable ICU 63 */ U_CAPI void U_EXPORT2 umutablecptrie_setRange(UMutableCPTrie *trie, UChar32 start, UChar32 end, uint32_t value, UErrorCode *pErrorCode); /** * Compacts the data and builds an immutable UCPTrie according to the parameters. * After this, the mutable trie will be empty. * * The mutable trie stores 32-bit values until buildImmutable() is called. * If values shorter than 32 bits are to be stored in the immutable trie, * then the upper bits are discarded. * For example, when the mutable trie contains values 0x81, -0x7f, and 0xa581, * and the value width is 8 bits, then each of these is stored as 0x81 * and the immutable trie will return that as an unsigned value. * (Some implementations may want to make productive temporary use of the upper bits * until buildImmutable() discards them.) * * Not every possible set of mappings can be built into a UCPTrie, * because of limitations resulting from speed and space optimizations. * Every Unicode assigned character can be mapped to a unique value. * Typical data yields data structures far smaller than the limitations. * * It is possible to construct extremely unusual mappings that exceed the data structure limits. * In such a case this function will fail with a U_INDEX_OUTOFBOUNDS_ERROR. * * @param trie the trie trie * @param type selects the trie type * @param valueWidth selects the number of bits in a trie data value; if smaller than 32 bits, * then the values stored in the trie will be truncated first * @param pErrorCode an in/out ICU UErrorCode * * @see umutablecptrie_fromUCPTrie * @stable ICU 63 */ U_CAPI UCPTrie * U_EXPORT2 umutablecptrie_buildImmutable(UMutableCPTrie *trie, UCPTrieType type, UCPTrieValueWidth valueWidth, UErrorCode *pErrorCode); U_CDECL_END #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalUMutableCPTriePointer * "Smart pointer" class, closes a UMutableCPTrie via umutablecptrie_close(). * For most methods see the LocalPointerBase base class. * * @see LocalPointerBase * @see LocalPointer * @stable ICU 63 */ U_DEFINE_LOCAL_OPEN_POINTER(LocalUMutableCPTriePointer, UMutableCPTrie, umutablecptrie_close); U_NAMESPACE_END #endif #endif