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