922 lines
36 KiB
C
922 lines
36 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 2001-2008, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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******************************************************************************
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* file name: utrie2.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2008aug16 (starting from a copy of utrie.h)
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* created by: Markus W. Scherer
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*/
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#ifndef __UTRIE2_H__
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#define __UTRIE2_H__
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#include "unicode/utypes.h"
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#include "udataswp.h"
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U_CDECL_BEGIN
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struct UTrie; /* forward declaration */
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#ifndef __UTRIE_H__
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typedef struct UTrie UTrie;
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#endif
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/**
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* \file
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*
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* This is a common implementation of a Unicode trie.
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* It is a kind of compressed, serializable table of 16- or 32-bit values associated with
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* Unicode code points (0..0x10ffff). (A map from code points to integers.)
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*
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* This is the second common version of a Unicode trie (hence the name UTrie2).
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* Compared with UTrie version 1:
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* - Still splitting BMP code points 11:5 bits for index and data table lookups.
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* - Still separate data for lead surrogate code _units_ vs. code _points_,
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* but the lead surrogate code unit values are not required any more
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* for data lookup for supplementary code points.
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* - The "folding" mechanism is removed. In UTrie version 1, this somewhat
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* hard-to-explain mechanism was meant to be used for optimized UTF-16
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* processing, with application-specific encoding of indexing bits
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* in the lead surrogate data for the associated supplementary code points.
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* - For the last single-value code point range (ending with U+10ffff),
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* the starting code point ("highStart") and the value are stored.
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* - For supplementary code points U+10000..highStart-1 a three-table lookup
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* (two index tables and one data table) is used. The first index
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* is truncated, omitting both the BMP portion and the high range.
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* - There is a special small index for 2-byte UTF-8, and the initial data
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* entries are designed for fast 1/2-byte UTF-8 lookup.
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*/
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/**
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* Trie structure.
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* Use only with public API macros and functions.
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*/
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struct UTrie2;
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typedef struct UTrie2 UTrie2;
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/* Public UTrie2 API functions: read-only access ---------------------------- */
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/**
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* Selectors for the width of a UTrie2 data value.
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*/
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enum UTrie2ValueBits {
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/** 16 bits per UTrie2 data value. */
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UTRIE2_16_VALUE_BITS,
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/** 32 bits per UTrie2 data value. */
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UTRIE2_32_VALUE_BITS,
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/** Number of selectors for the width of UTrie2 data values. */
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UTRIE2_COUNT_VALUE_BITS
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};
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typedef enum UTrie2ValueBits UTrie2ValueBits;
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/**
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* Open a frozen trie from its serialized from, stored in 32-bit-aligned memory.
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* Inverse of utrie2_serialize().
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* The memory must remain valid and unchanged as long as the trie is used.
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* You must utrie2_close() the trie once you are done using it.
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*
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* @param valueBits selects the data entry size; results in an
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* U_INVALID_FORMAT_ERROR if it does not match the serialized form
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* @param data a pointer to 32-bit-aligned memory containing the serialized form of a UTrie2
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* @param length the number of bytes available at data;
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* can be more than necessary
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* @param pActualLength receives the actual number of bytes at data taken up by the trie data;
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* can be NULL
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* @param pErrorCode an in/out ICU UErrorCode
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* @return the unserialized trie
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*
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* @see utrie2_open
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* @see utrie2_serialize
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*/
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U_CAPI UTrie2 * U_EXPORT2
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utrie2_openFromSerialized(UTrie2ValueBits valueBits,
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const void *data, int32_t length, int32_t *pActualLength,
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UErrorCode *pErrorCode);
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/**
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* Open a frozen, empty "dummy" trie.
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* A dummy trie is an empty trie, used when a real data trie cannot
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* be loaded. Equivalent to calling utrie2_open() and utrie2_freeze(),
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* but without internally creating and compacting/serializing the
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* builder data structure.
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*
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* The trie always returns the initialValue,
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* or the errorValue for out-of-range code points and illegal UTF-8.
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*
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* You must utrie2_close() the trie once you are done using it.
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*
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* @param valueBits selects the data entry size
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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 illegal UTF-8
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* @param pErrorCode an in/out ICU UErrorCode
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* @return the dummy trie
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*
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* @see utrie2_openFromSerialized
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* @see utrie2_open
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*/
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U_CAPI UTrie2 * U_EXPORT2
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utrie2_openDummy(UTrie2ValueBits valueBits,
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uint32_t initialValue, uint32_t errorValue,
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UErrorCode *pErrorCode);
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/**
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* Get a value from a code point as stored in the trie.
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* Easier to use than UTRIE2_GET16() and UTRIE2_GET32() but slower.
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* Easier to use because, unlike the macros, this function works on all UTrie2
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* objects, frozen or not, holding 16-bit or 32-bit data values.
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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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*/
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U_CAPI uint32_t U_EXPORT2
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utrie2_get32(const UTrie2 *trie, UChar32 c);
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/* enumeration callback types */
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/**
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* Callback from utrie2_enum(), extracts a uint32_t value from a
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* trie value. This value will be passed on to the UTrie2EnumRange function.
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*
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* @param context an opaque pointer, as passed into utrie2_enum()
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* @param value a value from the trie
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* @return the value that is to be passed on to the UTrie2EnumRange function
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*/
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typedef uint32_t U_CALLCONV
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UTrie2EnumValue(const void *context, uint32_t value);
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/**
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* Callback from utrie2_enum(), is called for each contiguous range
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* of code points with the same value as retrieved from the trie and
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* transformed by the UTrie2EnumValue function.
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*
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* The callback function can stop the enumeration by returning FALSE.
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*
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* @param context an opaque pointer, as passed into utrie2_enum()
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* @param start the first code point in a contiguous range with value
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* @param end the last code point in a contiguous range with value (inclusive)
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* @param value the value that is set for all code points in [start..end]
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* @return FALSE to stop the enumeration
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*/
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typedef UBool U_CALLCONV
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UTrie2EnumRange(const void *context, UChar32 start, UChar32 end, uint32_t value);
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/**
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* Enumerate efficiently all values in a trie.
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* Do not modify the trie during the enumeration.
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*
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* For each entry in the trie, the value to be delivered is passed through
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* the UTrie2EnumValue function.
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* The value is unchanged if that function pointer is NULL.
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*
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* For each contiguous range of code points with a given (transformed) value,
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* the UTrie2EnumRange function is called.
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*
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* @param trie a pointer to the trie
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* @param enumValue a pointer to a function that may transform the trie entry value,
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* or NULL if the values from the trie are to be used directly
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* @param enumRange a pointer to a function that is called for each contiguous range
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* of code points with the same (transformed) value
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* @param context an opaque pointer that is passed on to the callback functions
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*/
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U_CAPI void U_EXPORT2
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utrie2_enum(const UTrie2 *trie,
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UTrie2EnumValue *enumValue, UTrie2EnumRange *enumRange, const void *context);
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/* Building a trie ---------------------------------------------------------- */
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/**
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* Open an empty, writable trie. At build time, 32-bit data values are used.
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* utrie2_freeze() takes a valueBits parameter
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* which determines the data value width in the serialized and frozen forms.
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* You must utrie2_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 illegal UTF-8
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* @param pErrorCode an in/out ICU UErrorCode
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* @return a pointer to the allocated and initialized new trie
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*/
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U_CAPI UTrie2 * U_EXPORT2
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utrie2_open(uint32_t initialValue, uint32_t errorValue, UErrorCode *pErrorCode);
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/**
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* Clone a trie.
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* You must utrie2_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 a pointer to the new trie clone
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*/
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U_CAPI UTrie2 * U_EXPORT2
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utrie2_clone(const UTrie2 *other, UErrorCode *pErrorCode);
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/**
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* Clone a trie. The clone will be mutable/writable even if the other trie
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* is frozen. (See utrie2_freeze().)
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* You must utrie2_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 a pointer to the new trie clone
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*/
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U_CAPI UTrie2 * U_EXPORT2
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utrie2_cloneAsThawed(const UTrie2 *other, UErrorCode *pErrorCode);
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/**
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* Close a trie and release associated memory.
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*
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* @param trie the trie
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*/
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U_CAPI void U_EXPORT2
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utrie2_close(UTrie2 *trie);
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/**
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* Set a value for a code point.
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*
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* @param trie the unfrozen 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; among other possible error codes:
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* - U_NO_WRITE_PERMISSION if the trie is frozen
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*/
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U_CAPI void U_EXPORT2
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utrie2_set32(UTrie2 *trie, UChar32 c, uint32_t value, UErrorCode *pErrorCode);
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/**
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* Set a value in a range of code points [start..end].
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* All code points c with start<=c<=end will get the value if
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* overwrite is TRUE or if the old value is the initial value.
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*
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* @param trie the unfrozen 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 overwrite flag for whether old non-initial values are to be overwritten
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* @param pErrorCode an in/out ICU UErrorCode; among other possible error codes:
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* - U_NO_WRITE_PERMISSION if the trie is frozen
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*/
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U_CAPI void U_EXPORT2
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utrie2_setRange32(UTrie2 *trie,
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UChar32 start, UChar32 end,
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uint32_t value, UBool overwrite,
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UErrorCode *pErrorCode);
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/**
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* Freeze a trie. Make it immutable (read-only) and compact it,
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* ready for serialization and for use with fast macros.
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* Functions to set values will fail after serializing.
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*
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* A trie can be frozen only once. If this function is called again with different
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* valueBits then it will set a U_ILLEGAL_ARGUMENT_ERROR.
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*
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* @param trie the trie
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* @param valueBits selects the data entry size; if smaller than 32 bits, then
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* the values stored in the trie will be truncated
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* @param pErrorCode an in/out ICU UErrorCode; among other possible error codes:
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* - U_INDEX_OUTOFBOUNDS_ERROR if the compacted index or data arrays are too long
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* for serialization
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* (the trie will be immutable and usable,
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* but not frozen and not usable with the fast macros)
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*
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* @see utrie2_cloneAsThawed
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*/
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U_CAPI void U_EXPORT2
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utrie2_freeze(UTrie2 *trie, UTrie2ValueBits valueBits, UErrorCode *pErrorCode);
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/**
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* Test if the trie is frozen. (See utrie2_freeze().)
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*
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* @param trie the trie
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* @return TRUE if the trie is frozen, that is, immutable, ready for serialization
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* and for use with fast macros
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*/
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U_CAPI UBool U_EXPORT2
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utrie2_isFrozen(const UTrie2 *trie);
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/**
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* Serialize a frozen trie into 32-bit aligned memory.
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* If the trie is not frozen, then the function returns with a U_ILLEGAL_ARGUMENT_ERROR.
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* A trie can be serialized multiple times.
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*
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* @param trie the frozen trie
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* @param data a pointer to 32-bit-aligned memory to be filled with the trie data,
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* can be NULL if capacity==0
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* @param capacity the number of bytes available at data,
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* or 0 for preflighting
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* @param pErrorCode an in/out ICU UErrorCode; among other possible error codes:
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* - U_BUFFER_OVERFLOW_ERROR if the data storage block is too small for serialization
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* - U_ILLEGAL_ARGUMENT_ERROR if the trie is not frozen or the data and capacity
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* parameters are bad
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* @return the number of bytes written or needed for the trie
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*
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* @see utrie2_openFromSerialized()
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*/
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U_CAPI int32_t U_EXPORT2
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utrie2_serialize(UTrie2 *trie,
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void *data, int32_t capacity,
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UErrorCode *pErrorCode);
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/* Public UTrie2 API: miscellaneous functions ------------------------------- */
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/**
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* Get the UTrie version from 32-bit-aligned memory containing the serialized form
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* of either a UTrie (version 1) or a UTrie2 (version 2).
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*
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* @param data a pointer to 32-bit-aligned memory containing the serialized form
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* of a UTrie, version 1 or 2
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* @param length the number of bytes available at data;
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* can be more than necessary (see return value)
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* @param anyEndianOk If FALSE, only platform-endian serialized forms are recognized.
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* If TRUE, opposite-endian serialized forms are recognized as well.
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* @return the UTrie version of the serialized form, or 0 if it is not
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* recognized as a serialized UTrie
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*/
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U_CAPI int32_t U_EXPORT2
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utrie2_getVersion(const void *data, int32_t length, UBool anyEndianOk);
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/**
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* Swap a serialized UTrie2.
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* @internal
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*/
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U_CAPI int32_t U_EXPORT2
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utrie2_swap(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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/**
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* Build a UTrie2 (version 2) from a UTrie (version 1).
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* Enumerates all values in the UTrie and builds a UTrie2 with the same values.
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* The resulting UTrie2 will be frozen.
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*
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* @param trie1 the runtime UTrie structure to be enumerated
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* @param errorValue the value for out-of-range code points and illegal UTF-8
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* @param pErrorCode an in/out ICU UErrorCode
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* @return The frozen UTrie2 with the same values as the UTrie.
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*/
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U_CAPI UTrie2 * U_EXPORT2
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utrie2_fromUTrie(const UTrie *trie1, uint32_t errorValue, UErrorCode *pErrorCode);
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/* Public UTrie2 API macros ------------------------------------------------- */
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/*
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* These macros provide fast data lookup from a frozen trie.
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* They will crash when used on an unfrozen trie.
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*/
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/**
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* Return a 16-bit trie value from a code point, with range checking.
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* Returns trie->errorValue if c is not in the range 0..U+10ffff.
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*
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* @param trie (const UTrie2 *, in) a frozen trie
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* @param c (UChar32, in) the input code point
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* @return (uint16_t) The code point's trie value.
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*/
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#define UTRIE2_GET16(trie, c) _UTRIE2_GET((trie), index, (trie)->indexLength, (c))
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/**
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* Return a 32-bit trie value from a code point, with range checking.
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* Returns trie->errorValue if c is not in the range 0..U+10ffff.
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*
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* @param trie (const UTrie2 *, in) a frozen trie
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* @param c (UChar32, in) the input code point
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* @return (uint32_t) The code point's trie value.
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*/
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#define UTRIE2_GET32(trie, c) _UTRIE2_GET((trie), data32, 0, (c))
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/**
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* UTF-16: Get the next code point (UChar32 c, out), post-increment src,
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* and get a 16-bit value from the trie.
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*
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* @param trie (const UTrie2 *, in) a frozen trie
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* @param src (const UChar *, in/out) the source text pointer
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* @param limit (const UChar *, in) the limit pointer for the text, or NULL if NUL-terminated
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* @param c (UChar32, out) variable for the code point
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* @param result (uint16_t, out) uint16_t variable for the trie lookup result
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*/
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#define UTRIE2_U16_NEXT16(trie, src, limit, c, result) _UTRIE2_U16_NEXT(trie, index, src, limit, c, result)
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/**
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* UTF-16: Get the next code point (UChar32 c, out), post-increment src,
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* and get a 32-bit value from the trie.
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*
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* @param trie (const UTrie2 *, in) a frozen trie
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* @param src (const UChar *, in/out) the source text pointer
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* @param limit (const UChar *, in) the limit pointer for the text, or NULL if NUL-terminated
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* @param c (UChar32, out) variable for the code point
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* @param result (uint32_t, out) uint32_t variable for the trie lookup result
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*/
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#define UTRIE2_U16_NEXT32(trie, src, limit, c, result) _UTRIE2_U16_NEXT(trie, data32, src, limit, c, result)
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/**
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* UTF-16: Get the previous code point (UChar32 c, out), pre-decrement src,
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* and get a 16-bit value from the trie.
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*
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* @param trie (const UTrie2 *, in) a frozen trie
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* @param start (const UChar *, in) the start pointer for the text
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* @param src (const UChar *, in/out) the source text pointer
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* @param c (UChar32, out) variable for the code point
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* @param result (uint16_t, out) uint16_t variable for the trie lookup result
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*/
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#define UTRIE2_U16_PREV16(trie, start, src, c, result) _UTRIE2_U16_PREV(trie, index, start, src, c, result)
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/**
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* UTF-16: Get the previous code point (UChar32 c, out), pre-decrement src,
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* and get a 32-bit value from the trie.
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*
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* @param trie (const UTrie2 *, in) a frozen trie
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* @param start (const UChar *, in) the start pointer for the text
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* @param src (const UChar *, in/out) the source text pointer
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* @param c (UChar32, out) variable for the code point
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* @param result (uint32_t, out) uint32_t variable for the trie lookup result
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*/
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#define UTRIE2_U16_PREV32(trie, start, src, c, result) _UTRIE2_U16_PREV(trie, data32, start, src, c, result)
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/**
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* UTF-8: Post-increment src and get a 16-bit value from the trie.
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*
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* @param trie (const UTrie2 *, in) a frozen trie
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* @param src (const char *, in/out) the source text pointer
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* @param limit (const char *, in) the limit pointer for the text (must not be NULL)
|
|
* @param result (uint16_t, out) uint16_t variable for the trie lookup result
|
|
*/
|
|
#define UTRIE2_U8_NEXT16(trie, src, limit, result)\
|
|
_UTRIE2_U8_NEXT(trie, data16, index, src, limit, result)
|
|
|
|
/**
|
|
* UTF-8: Post-increment src and get a 32-bit value from the trie.
|
|
*
|
|
* @param trie (const UTrie2 *, in) a frozen trie
|
|
* @param src (const char *, in/out) the source text pointer
|
|
* @param limit (const char *, in) the limit pointer for the text (must not be NULL)
|
|
* @param result (uint16_t, out) uint32_t variable for the trie lookup result
|
|
*/
|
|
#define UTRIE2_U8_NEXT32(trie, src, limit, result) \
|
|
_UTRIE2_U8_NEXT(trie, data32, data32, src, limit, result)
|
|
|
|
/**
|
|
* UTF-8: Pre-decrement src and get a 16-bit value from the trie.
|
|
*
|
|
* @param trie (const UTrie2 *, in) a frozen trie
|
|
* @param start (const char *, in) the start pointer for the text
|
|
* @param src (const char *, in/out) the source text pointer
|
|
* @param result (uint16_t, out) uint16_t variable for the trie lookup result
|
|
*/
|
|
#define UTRIE2_U8_PREV16(trie, start, src, result) \
|
|
_UTRIE2_U8_PREV(trie, data16, index, start, src, result)
|
|
|
|
/**
|
|
* UTF-8: Pre-decrement src and get a 32-bit value from the trie.
|
|
*
|
|
* @param trie (const UTrie2 *, in) a frozen trie
|
|
* @param start (const char *, in) the start pointer for the text
|
|
* @param src (const char *, in/out) the source text pointer
|
|
* @param result (uint16_t, out) uint32_t variable for the trie lookup result
|
|
*/
|
|
#define UTRIE2_U8_PREV32(trie, start, src, result) \
|
|
_UTRIE2_U8_PREV(trie, data32, data32, start, src, result)
|
|
|
|
/* Public UTrie2 API: optimized UTF-16 access ------------------------------- */
|
|
|
|
/*
|
|
* The following functions and macros are used for highly optimized UTF-16
|
|
* text processing. The UTRIE2_U16_NEXTxy() macros do not depend on these.
|
|
*
|
|
* A UTrie2 stores separate values for lead surrogate code _units_ vs. code _points_.
|
|
* UTF-16 text processing can be optimized by detecting surrogate pairs and
|
|
* assembling supplementary code points only when there is non-trivial data
|
|
* available.
|
|
*
|
|
* At build-time, use utrie2_enumForLeadSurrogate() to see if there
|
|
* is non-trivial (non-initialValue) data for any of the supplementary
|
|
* code points associated with a lead surrogate.
|
|
* If so, then set a special (application-specific) value for the
|
|
* lead surrogate code _unit_, with utrie2_set32ForLeadSurrogateCodeUnit().
|
|
*
|
|
* At runtime, use UTRIE2_GET16_FROM_U16_SINGLE_LEAD() or
|
|
* UTRIE2_GET32_FROM_U16_SINGLE_LEAD() per code unit. If there is non-trivial
|
|
* data and the code unit is a lead surrogate, then check if a trail surrogate
|
|
* follows. If so, assemble the supplementary code point with
|
|
* U16_GET_SUPPLEMENTARY() and look up its value with UTRIE2_GET16_FROM_SUPP()
|
|
* or UTRIE2_GET32_FROM_SUPP(); otherwise reset the lead
|
|
* surrogate's value or do a code point lookup for it.
|
|
*
|
|
* If there is only trivial data for lead and trail surrogates, then processing
|
|
* can often skip them. For example, in normalization or case mapping
|
|
* all characters that do not have any mappings are simply copied as is.
|
|
*/
|
|
|
|
/**
|
|
* Get a value from a lead surrogate code unit as stored in the trie.
|
|
*
|
|
* @param trie the trie
|
|
* @param c the code unit (U+D800..U+DBFF)
|
|
* @return the value
|
|
*/
|
|
U_CAPI uint32_t U_EXPORT2
|
|
utrie2_get32FromLeadSurrogateCodeUnit(const UTrie2 *trie, UChar32 c);
|
|
|
|
/**
|
|
* Enumerate the trie values for the 1024=0x400 code points
|
|
* corresponding to a given lead surrogate.
|
|
* For example, for the lead surrogate U+D87E it will enumerate the values
|
|
* for [U+2F800..U+2FC00[.
|
|
* Used by data builder code that sets special lead surrogate code unit values
|
|
* for optimized UTF-16 string processing.
|
|
*
|
|
* Do not modify the trie during the enumeration.
|
|
*
|
|
* Except for the limited code point range, this functions just like utrie2_enum():
|
|
* For each entry in the trie, the value to be delivered is passed through
|
|
* the UTrie2EnumValue function.
|
|
* The value is unchanged if that function pointer is NULL.
|
|
*
|
|
* For each contiguous range of code points with a given (transformed) value,
|
|
* the UTrie2EnumRange function is called.
|
|
*
|
|
* @param trie a pointer to the trie
|
|
* @param enumValue a pointer to a function that may transform the trie entry value,
|
|
* or NULL if the values from the trie are to be used directly
|
|
* @param enumRange a pointer to a function that is called for each contiguous range
|
|
* of code points with the same (transformed) value
|
|
* @param context an opaque pointer that is passed on to the callback functions
|
|
*/
|
|
U_CAPI void U_EXPORT2
|
|
utrie2_enumForLeadSurrogate(const UTrie2 *trie, UChar32 lead,
|
|
UTrie2EnumValue *enumValue, UTrie2EnumRange *enumRange,
|
|
const void *context);
|
|
|
|
/**
|
|
* Set a value for a lead surrogate code unit.
|
|
*
|
|
* @param trie the unfrozen trie
|
|
* @param lead the lead surrogate code unit (U+D800..U+DBFF)
|
|
* @param value the value
|
|
* @param pErrorCode an in/out ICU UErrorCode; among other possible error codes:
|
|
* - U_NO_WRITE_PERMISSION if the trie is frozen
|
|
*/
|
|
U_CAPI void U_EXPORT2
|
|
utrie2_set32ForLeadSurrogateCodeUnit(UTrie2 *trie,
|
|
UChar32 lead, uint32_t value,
|
|
UErrorCode *pErrorCode);
|
|
|
|
/**
|
|
* Return a 16-bit trie value from a UTF-16 single/lead code unit (<=U+ffff).
|
|
* Same as UTRIE2_GET16() if c is a BMP code point except for lead surrogates,
|
|
* but smaller and faster.
|
|
*
|
|
* @param trie (const UTrie2 *, in) a frozen trie
|
|
* @param c (UChar32, in) the input code unit, must be 0<=c<=U+ffff
|
|
* @return (uint16_t) The code unit's trie value.
|
|
*/
|
|
#define UTRIE2_GET16_FROM_U16_SINGLE_LEAD(trie, c) _UTRIE2_GET_FROM_U16_SINGLE_LEAD((trie), index, c)
|
|
|
|
/**
|
|
* Return a 32-bit trie value from a UTF-16 single/lead code unit (<=U+ffff).
|
|
* Same as UTRIE2_GET32() if c is a BMP code point except for lead surrogates,
|
|
* but smaller and faster.
|
|
*
|
|
* @param trie (const UTrie2 *, in) a frozen trie
|
|
* @param c (UChar32, in) the input code unit, must be 0<=c<=U+ffff
|
|
* @return (uint32_t) The code unit's trie value.
|
|
*/
|
|
#define UTRIE2_GET32_FROM_U16_SINGLE_LEAD(trie, c) _UTRIE2_GET_FROM_U16_SINGLE_LEAD((trie), data32, c)
|
|
|
|
/**
|
|
* Return a 16-bit trie value from a supplementary code point (U+10000..U+10ffff).
|
|
*
|
|
* @param trie (const UTrie2 *, in) a frozen trie
|
|
* @param c (UChar32, in) the input code point, must be U+10000<=c<=U+10ffff
|
|
* @return (uint16_t) The code point's trie value.
|
|
*/
|
|
#define UTRIE2_GET16_FROM_SUPP(trie, c) _UTRIE2_GET_FROM_SUPP((trie), index, c)
|
|
|
|
/**
|
|
* Return a 32-bit trie value from a supplementary code point (U+10000..U+10ffff).
|
|
*
|
|
* @param trie (const UTrie2 *, in) a frozen trie
|
|
* @param c (UChar32, in) the input code point, must be U+10000<=c<=U+10ffff
|
|
* @return (uint32_t) The code point's trie value.
|
|
*/
|
|
#define UTRIE2_GET32_FROM_SUPP(trie, c) _UTRIE2_GET_FROM_SUPP((trie), data32, c)
|
|
|
|
/* Internal definitions ----------------------------------------------------- */
|
|
|
|
/** Build-time trie structure. */
|
|
struct UNewTrie2;
|
|
typedef struct UNewTrie2 UNewTrie2;
|
|
|
|
/*
|
|
* Trie structure definition.
|
|
*
|
|
* Either the data table is 16 bits wide and accessed via the index
|
|
* pointer, with each index item increased by indexLength;
|
|
* in this case, data32==NULL, and data16 is used for direct ASCII access.
|
|
*
|
|
* Or the data table is 32 bits wide and accessed via the data32 pointer.
|
|
*/
|
|
struct UTrie2 {
|
|
/* protected: used by macros and functions for reading values */
|
|
const uint16_t *index;
|
|
const uint16_t *data16; /* for fast UTF-8 ASCII access, if 16b data */
|
|
const uint32_t *data32; /* NULL if 16b data is used via index */
|
|
|
|
int32_t indexLength, dataLength;
|
|
uint16_t index2NullOffset; /* 0xffff if there is no dedicated index-2 null block */
|
|
uint16_t dataNullOffset;
|
|
uint32_t initialValue;
|
|
/** Value returned for out-of-range code points and illegal UTF-8. */
|
|
uint32_t errorValue;
|
|
|
|
/* Start of the last range which ends at U+10ffff, and its value. */
|
|
UChar32 highStart;
|
|
int32_t highValueIndex;
|
|
|
|
/* private: used by builder and unserialization functions */
|
|
void *memory; /* serialized bytes; NULL if not frozen yet */
|
|
int32_t length; /* number of serialized bytes at memory; 0 if not frozen yet */
|
|
UBool isMemoryOwned; /* TRUE if the trie owns the memory */
|
|
UBool padding1;
|
|
int16_t padding2;
|
|
UNewTrie2 *newTrie; /* builder object; NULL when frozen */
|
|
};
|
|
|
|
/**
|
|
* Trie constants, defining shift widths, index array lengths, etc.
|
|
*
|
|
* These are needed for the runtime macros but users can treat these as
|
|
* implementation details and skip to the actual public API further below.
|
|
*/
|
|
enum {
|
|
/** Shift size for getting the index-1 table offset. */
|
|
UTRIE2_SHIFT_1=6+5,
|
|
|
|
/** Shift size for getting the index-2 table offset. */
|
|
UTRIE2_SHIFT_2=5,
|
|
|
|
/**
|
|
* Difference between the two shift sizes,
|
|
* for getting an index-1 offset from an index-2 offset. 6=11-5
|
|
*/
|
|
UTRIE2_SHIFT_1_2=UTRIE2_SHIFT_1-UTRIE2_SHIFT_2,
|
|
|
|
/**
|
|
* Number of index-1 entries for the BMP. 32=0x20
|
|
* This part of the index-1 table is omitted from the serialized form.
|
|
*/
|
|
UTRIE2_OMITTED_BMP_INDEX_1_LENGTH=0x10000>>UTRIE2_SHIFT_1,
|
|
|
|
/** Number of code points per index-1 table entry. 2048=0x800 */
|
|
UTRIE2_CP_PER_INDEX_1_ENTRY=1<<UTRIE2_SHIFT_1,
|
|
|
|
/** Number of entries in an index-2 block. 64=0x40 */
|
|
UTRIE2_INDEX_2_BLOCK_LENGTH=1<<UTRIE2_SHIFT_1_2,
|
|
|
|
/** Mask for getting the lower bits for the in-index-2-block offset. */
|
|
UTRIE2_INDEX_2_MASK=UTRIE2_INDEX_2_BLOCK_LENGTH-1,
|
|
|
|
/** Number of entries in a data block. 32=0x20 */
|
|
UTRIE2_DATA_BLOCK_LENGTH=1<<UTRIE2_SHIFT_2,
|
|
|
|
/** Mask for getting the lower bits for the in-data-block offset. */
|
|
UTRIE2_DATA_MASK=UTRIE2_DATA_BLOCK_LENGTH-1,
|
|
|
|
/**
|
|
* Shift size for shifting left the index array values.
|
|
* Increases possible data size with 16-bit index values at the cost
|
|
* of compactability.
|
|
* This requires data blocks to be aligned by UTRIE2_DATA_GRANULARITY.
|
|
*/
|
|
UTRIE2_INDEX_SHIFT=2,
|
|
|
|
/** The alignment size of a data block. Also the granularity for compaction. */
|
|
UTRIE2_DATA_GRANULARITY=1<<UTRIE2_INDEX_SHIFT,
|
|
|
|
/* Fixed layout of the first part of the index array. ------------------- */
|
|
|
|
/**
|
|
* The BMP part of the index-2 table is fixed and linear and starts at offset 0.
|
|
* Length=2048=0x800=0x10000>>UTRIE2_SHIFT_2.
|
|
*/
|
|
UTRIE2_INDEX_2_OFFSET=0,
|
|
|
|
/**
|
|
* The part of the index-2 table for U+D800..U+DBFF stores values for
|
|
* lead surrogate code _units_ not code _points_.
|
|
* Values for lead surrogate code _points_ are indexed with this portion of the table.
|
|
* Length=32=0x20=0x400>>UTRIE2_SHIFT_2. (There are 1024=0x400 lead surrogates.)
|
|
*/
|
|
UTRIE2_LSCP_INDEX_2_OFFSET=0x10000>>UTRIE2_SHIFT_2,
|
|
UTRIE2_LSCP_INDEX_2_LENGTH=0x400>>UTRIE2_SHIFT_2,
|
|
|
|
/** Count the lengths of both BMP pieces. 2080=0x820 */
|
|
UTRIE2_INDEX_2_BMP_LENGTH=UTRIE2_LSCP_INDEX_2_OFFSET+UTRIE2_LSCP_INDEX_2_LENGTH,
|
|
|
|
/**
|
|
* The 2-byte UTF-8 version of the index-2 table follows at offset 2080=0x820.
|
|
* Length 32=0x20 for lead bytes C0..DF, regardless of UTRIE2_SHIFT_2.
|
|
*/
|
|
UTRIE2_UTF8_2B_INDEX_2_OFFSET=UTRIE2_INDEX_2_BMP_LENGTH,
|
|
UTRIE2_UTF8_2B_INDEX_2_LENGTH=0x800>>6, /* U+0800 is the first code point after 2-byte UTF-8 */
|
|
|
|
/**
|
|
* The index-1 table, only used for supplementary code points, at offset 2112=0x840.
|
|
* Variable length, for code points up to highStart, where the last single-value range starts.
|
|
* Maximum length 512=0x200=0x100000>>UTRIE2_SHIFT_1.
|
|
* (For 0x100000 supplementary code points U+10000..U+10ffff.)
|
|
*
|
|
* The part of the index-2 table for supplementary code points starts
|
|
* after this index-1 table.
|
|
*
|
|
* Both the index-1 table and the following part of the index-2 table
|
|
* are omitted completely if there is only BMP data.
|
|
*/
|
|
UTRIE2_INDEX_1_OFFSET=UTRIE2_UTF8_2B_INDEX_2_OFFSET+UTRIE2_UTF8_2B_INDEX_2_LENGTH,
|
|
UTRIE2_MAX_INDEX_1_LENGTH=0x100000>>UTRIE2_SHIFT_1,
|
|
|
|
/*
|
|
* Fixed layout of the first part of the data array. -----------------------
|
|
* Starts with 4 blocks (128=0x80 entries) for ASCII.
|
|
*/
|
|
|
|
/**
|
|
* The illegal-UTF-8 data block follows the ASCII block, at offset 128=0x80.
|
|
* Used with linear access for single bytes 0..0xbf for simple error handling.
|
|
* Length 64=0x40, not UTRIE2_DATA_BLOCK_LENGTH.
|
|
*/
|
|
UTRIE2_BAD_UTF8_DATA_OFFSET=0x80,
|
|
|
|
/** The start of non-linear-ASCII data blocks, at offset 192=0xc0. */
|
|
UTRIE2_DATA_START_OFFSET=0xc0
|
|
};
|
|
|
|
/* Internal functions and macros -------------------------------------------- */
|
|
|
|
/**
|
|
* Internal function for part of the UTRIE2_U8_NEXTxx() macro implementations.
|
|
* Do not call directly.
|
|
* @internal
|
|
*/
|
|
U_INTERNAL int32_t U_EXPORT2
|
|
utrie2_internalU8NextIndex(const UTrie2 *trie, UChar32 c,
|
|
const uint8_t *src, const uint8_t *limit);
|
|
|
|
/**
|
|
* Internal function for part of the UTRIE2_U8_PREVxx() macro implementations.
|
|
* Do not call directly.
|
|
* @internal
|
|
*/
|
|
U_INTERNAL int32_t U_EXPORT2
|
|
utrie2_internalU8PrevIndex(const UTrie2 *trie, UChar32 c,
|
|
const uint8_t *start, const uint8_t *src);
|
|
|
|
|
|
/** Internal low-level trie getter. Returns a data index. */
|
|
#define _UTRIE2_INDEX_RAW(offset, trieIndex, c) \
|
|
(((int32_t)((trieIndex)[(offset)+((c)>>UTRIE2_SHIFT_2)]) \
|
|
<<UTRIE2_INDEX_SHIFT)+ \
|
|
((c)&UTRIE2_DATA_MASK))
|
|
|
|
/** Internal trie getter from a UTF-16 single/lead code unit. Returns the data index. */
|
|
#define _UTRIE2_INDEX_FROM_U16_SINGLE_LEAD(trieIndex, c) _UTRIE2_INDEX_RAW(0, trieIndex, c)
|
|
|
|
/** Internal trie getter from a lead surrogate code point (D800..DBFF). Returns the data index. */
|
|
#define _UTRIE2_INDEX_FROM_LSCP(trieIndex, c) \
|
|
_UTRIE2_INDEX_RAW(UTRIE2_LSCP_INDEX_2_OFFSET-(0xd800>>UTRIE2_SHIFT_2), trieIndex, c)
|
|
|
|
/** Internal trie getter from a BMP code point. Returns the data index. */
|
|
#define _UTRIE2_INDEX_FROM_BMP(trieIndex, c) \
|
|
_UTRIE2_INDEX_RAW(U_IS_LEAD(c) ? UTRIE2_LSCP_INDEX_2_OFFSET-(0xd800>>UTRIE2_SHIFT_2) : 0, \
|
|
trieIndex, c)
|
|
|
|
/** Internal trie getter from a supplementary code point below highStart. Returns the data index. */
|
|
#define _UTRIE2_INDEX_FROM_SUPP(trieIndex, c) \
|
|
(((int32_t)((trieIndex)[ \
|
|
(trieIndex)[(UTRIE2_INDEX_1_OFFSET-UTRIE2_OMITTED_BMP_INDEX_1_LENGTH)+ \
|
|
((c)>>UTRIE2_SHIFT_1)]+ \
|
|
(((c)>>UTRIE2_SHIFT_2)&UTRIE2_INDEX_2_MASK)]) \
|
|
<<UTRIE2_INDEX_SHIFT)+ \
|
|
((c)&UTRIE2_DATA_MASK))
|
|
|
|
/**
|
|
* Internal trie getter from a code point, with checking that c is in 0..10FFFF.
|
|
* Returns the data index.
|
|
*/
|
|
#define _UTRIE2_INDEX_FROM_CP(trie, asciiOffset, c) \
|
|
((uint32_t)(c)<0xd800 ? \
|
|
_UTRIE2_INDEX_RAW(0, (trie)->index, c) : \
|
|
(uint32_t)(c)<=0xffff ? \
|
|
_UTRIE2_INDEX_RAW( \
|
|
(c)<=0xdbff ? UTRIE2_LSCP_INDEX_2_OFFSET-(0xd800>>UTRIE2_SHIFT_2) : 0, \
|
|
(trie)->index, c) : \
|
|
(uint32_t)(c)>0x10ffff ? \
|
|
(asciiOffset)+UTRIE2_BAD_UTF8_DATA_OFFSET : \
|
|
(c)>=(trie)->highStart ? \
|
|
(trie)->highValueIndex : \
|
|
_UTRIE2_INDEX_FROM_SUPP((trie)->index, c))
|
|
|
|
/** Internal trie getter from a UTF-16 single/lead code unit. Returns the data. */
|
|
#define _UTRIE2_GET_FROM_U16_SINGLE_LEAD(trie, data, c) \
|
|
(trie)->data[_UTRIE2_INDEX_FROM_U16_SINGLE_LEAD((trie)->index, c)]
|
|
|
|
/** Internal trie getter from a supplementary code point. Returns the data. */
|
|
#define _UTRIE2_GET_FROM_SUPP(trie, data, c) \
|
|
(trie)->data[(c)>=(trie)->highStart ? (trie)->highValueIndex : \
|
|
_UTRIE2_INDEX_FROM_SUPP((trie)->index, c)]
|
|
|
|
/**
|
|
* Internal trie getter from a code point, with checking that c is in 0..10FFFF.
|
|
* Returns the data.
|
|
*/
|
|
#define _UTRIE2_GET(trie, data, asciiOffset, c) \
|
|
(trie)->data[_UTRIE2_INDEX_FROM_CP(trie, asciiOffset, c)]
|
|
|
|
/** Internal next-post-increment: get the next code point (c) and its data. */
|
|
#define _UTRIE2_U16_NEXT(trie, data, src, limit, c, result) { \
|
|
{ \
|
|
uint16_t __c2; \
|
|
(c)=*(src)++; \
|
|
if(!U16_IS_LEAD(c)) { \
|
|
(result)=_UTRIE2_GET_FROM_U16_SINGLE_LEAD(trie, data, c); \
|
|
} else if((src)==(limit) || !U16_IS_TRAIL(__c2=*(src))) { \
|
|
(result)=(trie)->data[_UTRIE2_INDEX_FROM_LSCP((trie)->index, c)]; \
|
|
} else { \
|
|
++(src); \
|
|
(c)=U16_GET_SUPPLEMENTARY((c), __c2); \
|
|
(result)=_UTRIE2_GET_FROM_SUPP((trie), data, (c)); \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/** Internal pre-decrement-previous: get the previous code point (c) and its data */
|
|
#define _UTRIE2_U16_PREV(trie, data, start, src, c, result) { \
|
|
{ \
|
|
uint16_t __c2; \
|
|
(c)=*--(src); \
|
|
if(!U16_IS_TRAIL(c) || (src)==(start) || !U16_IS_LEAD(__c2=*((src)-1))) { \
|
|
(result)=(trie)->data[_UTRIE2_INDEX_FROM_BMP((trie)->index, c)]; \
|
|
} else { \
|
|
--(src); \
|
|
(c)=U16_GET_SUPPLEMENTARY(__c2, (c)); \
|
|
(result)=_UTRIE2_GET_FROM_SUPP((trie), data, (c)); \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/** Internal UTF-8 next-post-increment: get the next code point's data. */
|
|
#define _UTRIE2_U8_NEXT(trie, ascii, data, src, limit, result) { \
|
|
uint8_t __lead=(uint8_t)*(src)++; \
|
|
if(__lead<0xc0) { \
|
|
(result)=(trie)->ascii[__lead]; \
|
|
} else { \
|
|
uint8_t __t1, __t2; \
|
|
if( /* handle U+0000..U+07FF inline */ \
|
|
__lead<0xe0 && (src)<(limit) && \
|
|
(__t1=(uint8_t)(*(src)-0x80))<=0x3f \
|
|
) { \
|
|
++(src); \
|
|
(result)=(trie)->data[ \
|
|
(trie)->index[(UTRIE2_UTF8_2B_INDEX_2_OFFSET-0xc0)+__lead]+ \
|
|
__t1]; \
|
|
} else if( /* handle U+0000..U+CFFF inline */ \
|
|
__lead<0xed && ((src)+1)<(limit) && \
|
|
(__t1=(uint8_t)(*(src)-0x80))<=0x3f && (__lead>0xe0 || __t1>=0x20) && \
|
|
(__t2=(uint8_t)(*((src)+1)-0x80))<= 0x3f \
|
|
) { \
|
|
(src)+=2; \
|
|
(result)=(trie)->data[ \
|
|
((int32_t)((trie)->index[((__lead-0xe0)<<(12-UTRIE2_SHIFT_2))+ \
|
|
(__t1<<(6-UTRIE2_SHIFT_2))+(__t2>>UTRIE2_SHIFT_2)]) \
|
|
<<UTRIE2_INDEX_SHIFT)+ \
|
|
(__t2&UTRIE2_DATA_MASK)]; \
|
|
} else { \
|
|
int32_t __index=utrie2_internalU8NextIndex((trie), __lead, (const uint8_t *)(src), \
|
|
(const uint8_t *)(limit)); \
|
|
(src)+=__index&7; \
|
|
(result)=(trie)->data[__index>>3]; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/** Internal UTF-8 pre-decrement-previous: get the previous code point's data. */
|
|
#define _UTRIE2_U8_PREV(trie, ascii, data, start, src, result) { \
|
|
uint8_t __b=(uint8_t)*--(src); \
|
|
if(__b<0x80) { \
|
|
(result)=(trie)->ascii[__b]; \
|
|
} else { \
|
|
int32_t __index=utrie2_internalU8PrevIndex((trie), __b, (const uint8_t *)(start), \
|
|
(const uint8_t *)(src)); \
|
|
(src)-=__index&7; \
|
|
(result)=(trie)->data[__index>>3]; \
|
|
} \
|
|
}
|
|
|
|
U_CDECL_END
|
|
|
|
#endif
|