my_uca_scanner Class Reference

Unicode Collation Algorithm: Collation element (weight) scanner, for consequent scan of collations weights from a string. More...

Inheritance diagram for my_uca_scanner:

Public Member Functions
unsigned	get_weight_level () const
	Get the level the scanner is currently working on. More...

Protected Member Functions
	my_uca_scanner (const CHARSET_INFO *cs_arg, const uint8_t *str, size_t length)
const uint16_t *	contraction_find (my_wc_t wc0, size_t *chars_skipped)
	Find a contraction in the input stream and return its weight array. More...
const uint16_t *	previous_context_find (my_wc_t wc0, my_wc_t wc1)
	Find weight for contraction with previous context and return its weight array. More...

Protected Attributes
unsigned	weight_lv {0}
const uint16_t *	wbeg
unsigned	wbeg_stride {0}
const uint8_t *	sbeg
const uint8_t *	send
const MY_UCA_INFO *	uca {nullptr}
uint16_t	implicit [10] {}
my_wc_t	prev_char {0}
const CHARSET_INFO *	cs
unsigned	num_of_ce_left {0}
const uint8_t *	sbeg_dup

Detailed Description

Unicode Collation Algorithm: Collation element (weight) scanner, for consequent scan of collations weights from a string.

Only meant as a base class; instantiate uca_scanner_any or uca_scanner_900 instead of this.

Constructor & Destructor Documentation

my_uca_scanner()

my_uca_scanner::my_uca_scanner ( const CHARSET_INFO *  cs_arg, const uint8_t *  str, size_t  length  )

inlineprotected

Member Function Documentation

contraction_find()

const uint16_t * my_uca_scanner::contraction_find ( my_wc_t  wc0, size_t *  chars_skipped  )

protected

Find a contraction in the input stream and return its weight array.

Scan input code points to find a longest path in contraction trie which contains all these code points. If the ending node of this path is end of contraction, return the weight array.

Parameters

	wc0	The first code point of the contraction (which should have the MY_UCA_CNT_HEAD flag).
[out]	chars_skipped	How many code points where skipped in the contraction we found. Only makes sense if we actually found one.

Returns

Weight array

Return values

NULL	no contraction found
ptr	contraction weight array

get_weight_level()

unsigned my_uca_scanner::get_weight_level ( ) const

inline

Get the level the scanner is currently working on.

The string can be scanned multiple times (if the collation requires multi-level comparisons, e.g. for accent or case sensitivity); first to get primary weights, then from the start again for secondary, etc.

previous_context_find()

ALWAYS_INLINE const uint16_t * my_uca_scanner::previous_context_find ( my_wc_t  wc0, my_wc_t  wc1  )

inlineprotected

Find weight for contraction with previous context and return its weight array.

Parameters

wc0	Previous code point
wc1	Current code point

Returns

Weight array

Return values

NULL	- no contraction with context found
ptr	- contraction weight array

Member Data Documentation

cs

const CHARSET_INFO* my_uca_scanner::cs

protected

implicit

uint16_t my_uca_scanner::implicit[10] {}

protected

num_of_ce_left

unsigned my_uca_scanner::num_of_ce_left {0}

protected

prev_char

my_wc_t my_uca_scanner::prev_char {0}

protected

sbeg

const uint8_t* my_uca_scanner::sbeg

protected

sbeg_dup

const uint8_t* my_uca_scanner::sbeg_dup

protected

send

const uint8_t* my_uca_scanner::send

protected

uca

const MY_UCA_INFO* my_uca_scanner::uca {nullptr}

protected

wbeg

const uint16_t* my_uca_scanner::wbeg

protected

wbeg_stride

unsigned my_uca_scanner::wbeg_stride {0}

protected

weight_lv

unsigned my_uca_scanner::weight_lv {0}

protected

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The documentation for this class was generated from the following file:

• strings/ctype-uca.cc