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// © 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
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