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Diffstat (limited to 'thirdparty/icu4c/common/unicode/umutablecptrie.h')
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1 files changed, 241 insertions, 0 deletions
diff --git a/thirdparty/icu4c/common/unicode/umutablecptrie.h b/thirdparty/icu4c/common/unicode/umutablecptrie.h new file mode 100644 index 0000000000..5325d58147 --- /dev/null +++ b/thirdparty/icu4c/common/unicode/umutablecptrie.h @@ -0,0 +1,241 @@ +// © 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/ucpmap.h" +#include "unicode/ucptrie.h" +#include "unicode/utf8.h" + +#if U_SHOW_CPLUSPLUS_API +#include "unicode/localpointer.h" +#endif // U_SHOW_CPLUSPLUS_API + +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 |