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mariadb/strings/ctype-uca.inl
Alexander Barkov fd247cc21f MDEV-31340 Remove MY_COLLATION_HANDLER::strcasecmp() 
This patch also fixes:
  MDEV-33050 Build-in schemas like oracle_schema are accent insensitive
  MDEV-33084 LASTVAL(t1) and LASTVAL(T1) do not work well with lower-case-table-names=0
  MDEV-33085 Tables T1 and t1 do not work well with ENGINE=CSV and lower-case-table-names=0
  MDEV-33086 SHOW OPEN TABLES IN DB1 -- is case insensitive with lower-case-table-names=0
  MDEV-33088 Cannot create triggers in the database `MYSQL`
  MDEV-33103 LOCK TABLE t1 AS t2 -- alias is not case sensitive with lower-case-table-names=0
  MDEV-33109 DROP DATABASE MYSQL -- does not drop SP with lower-case-table-names=0
  MDEV-33110 HANDLER commands are case insensitive with lower-case-table-names=0
  MDEV-33119 User is case insensitive in INFORMATION_SCHEMA.VIEWS
  MDEV-33120 System log table names are case insensitive with lower-cast-table-names=0

- Removing the virtual function strnncoll() from MY_COLLATION_HANDLER

- Adding a wrapper function CHARSET_INFO::streq(), to compare
  two strings for equality. For now it calls strnncoll() internally.
  In the future it will turn into a virtual function.

- Adding new accent sensitive case insensitive collations:
    - utf8mb4_general1400_as_ci
    - utf8mb3_general1400_as_ci
  They implement accent sensitive case insensitive comparison.
  The weight of a character is equal to the code point of its
  upper case variant. These collations use Unicode-14.0.0 casefolding data.

  The result of
     my_charset_utf8mb3_general1400_as_ci.strcoll()
  is very close to the former
     my_charset_utf8mb3_general_ci.strcasecmp()

  There is only a difference in a couple dozen rare characters, because:
    - the switch from "tolower" to "toupper" comparison, to make
      utf8mb3_general1400_as_ci closer to utf8mb3_general_ci
    - the switch from Unicode-3.0.0 to Unicode-14.0.0
  This difference should be tolarable. See the list of affected
  characters in the MDEV description.

  Note, utf8mb4_general1400_as_ci correctly handles non-BMP characters!
  Unlike utf8mb4_general_ci, it does not treat all BMP characters
  as equal.

- Adding classes representing names of the file based database objects:

    Lex_ident_db
    Lex_ident_table
    Lex_ident_trigger

  Their comparison collation depends on the underlying
  file system case sensitivity and on --lower-case-table-names
  and can be either my_charset_bin or my_charset_utf8mb3_general1400_as_ci.

- Adding classes representing names of other database objects,
  whose names have case insensitive comparison style,
  using my_charset_utf8mb3_general1400_as_ci:

  Lex_ident_column
  Lex_ident_sys_var
  Lex_ident_user_var
  Lex_ident_sp_var
  Lex_ident_ps
  Lex_ident_i_s_table
  Lex_ident_window
  Lex_ident_func
  Lex_ident_partition
  Lex_ident_with_element
  Lex_ident_rpl_filter
  Lex_ident_master_info
  Lex_ident_host
  Lex_ident_locale
  Lex_ident_plugin
  Lex_ident_engine
  Lex_ident_server
  Lex_ident_savepoint
  Lex_ident_charset
  engine_option_value::Name

- All the mentioned Lex_ident_xxx classes implement a method streq():

  if (ident1.streq(ident2))
     do_equal();

  This method works as a wrapper for CHARSET_INFO::streq().

- Changing a lot of "LEX_CSTRING name" to "Lex_ident_xxx name"
  in class members and in function/method parameters.

- Replacing all calls like
    system_charset_info->coll->strcasecmp(ident1, ident2)
  to
    ident1.streq(ident2)

- Taking advantage of the c++11 user defined literal operator
  for LEX_CSTRING (see m_strings.h) and Lex_ident_xxx (see lex_ident.h)
  data types. Use example:

  const Lex_ident_column primary_key_name= "PRIMARY"_Lex_ident_column;

  is now a shorter version of:

  const Lex_ident_column primary_key_name=
    Lex_ident_column({STRING_WITH_LEN("PRIMARY")});
2024-04-18 15:22:10 +04:00

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/*
Copyright (c) 2018, 2020, MariaDB Corporation
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "ctype-mb.h"
#ifndef MY_FUNCTION_NAME
#error MY_FUNCTION_NAME is not defined
#endif
#ifndef MY_MB_WC
#error MY_MB_WC is not defined
#endif
#ifndef MY_LIKE_RANGE
#error MY_LIKE_RANGE is not defined
#endif
#ifndef MY_UCA_ASCII_OPTIMIZE
#error MY_ASCII_OPTIMIZE is not defined
#endif
#ifndef MY_UCA_COMPILE_CONTRACTIONS
#error MY_UCA_COMPILE_CONTRACTIONS is not defined
#endif
#ifndef MY_UCA_COLL_INIT
#error MY_UCA_COLL_INIT is not defined
#endif
#include "ctype-uca-scanner_next.inl"
#define SCANNER_NEXT_NCHARS
#include "ctype-uca-scanner_next.inl"
/*
Compares two strings according to the collation
SYNOPSIS:
strnncoll_onelevel()
cs Character set information
level Weight level (0 primary, 1 secondary, 2 tertiary, etc)
s First string
slen First string length
t Second string
tlen Seconf string length
level DUCETweight level
NOTES:
Initializes two weight scanners and gets weights
corresponding to two strings in a loop. If weights are not
the same at some step then returns their difference.
In the while() comparison these situations are possible:
1. (s_res>0) and (t_res>0) and (s_res == t_res)
Weights are the same so far, continue comparison
2. (s_res>0) and (t_res>0) and (s_res!=t_res)
A difference has been found, return.
3. (s_res>0) and (t_res<0)
We have reached the end of the second string, or found
an illegal multibyte sequence in the second string.
Return a positive number, i.e. the first string is bigger.
4. (s_res<0) and (t_res>0)
We have reached the end of the first string, or found
an illegal multibyte sequence in the first string.
Return a negative number, i.e. the second string is bigger.
5. (s_res<0) and (t_res<0)
Both scanners returned -1. It means we have riched
the end-of-string of illegal-sequence in both strings
at the same time. Return 0, strings are equal.
RETURN
Difference between two strings, according to the collation:
0 - means strings are equal
negative number - means the first string is smaller
positive number - means the first string is bigger
*/
static int
MY_FUNCTION_NAME(strnncoll_onelevel)(CHARSET_INFO *cs,
const MY_UCA_WEIGHT_LEVEL *level,
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
my_bool t_is_prefix)
{
my_uca_scanner sscanner;
my_uca_scanner tscanner;
my_uca_scanner_param param;
int s_res;
int t_res;
#if MY_UCA_ASCII_OPTIMIZE
{
size_t prefix= my_uca_level_booster_equal_prefix_length(level->booster,
s, slen, t, tlen);
s+= prefix, slen-= prefix;
t+= prefix, tlen-= prefix;
}
#endif
my_uca_scanner_param_init(&param, cs, level);
my_uca_scanner_init_any(&sscanner, s, slen);
my_uca_scanner_init_any(&tscanner, t, tlen);
do
{
s_res= MY_FUNCTION_NAME(scanner_next)(&sscanner, &param);
t_res= MY_FUNCTION_NAME(scanner_next)(&tscanner, &param);
} while ( s_res == t_res && s_res >0);
return (t_is_prefix && t_res < 0) ? 0 : (s_res - t_res);
}
/*
One-level, PAD SPACE.
*/
static int
MY_FUNCTION_NAME(strnncoll)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
my_bool t_is_prefix)
{
return MY_FUNCTION_NAME(strnncoll_onelevel)(cs, &cs->uca->level[0],
s, slen, t, tlen, t_is_prefix);
}
/*
Multi-level, PAD SPACE.
*/
static int
MY_FUNCTION_NAME(strnncoll_multilevel)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
my_bool t_is_prefix)
{
uint i, level_flags= cs->levels_for_order;
for (i= 0; level_flags; i++, level_flags>>= 1)
{
int ret;
if (!(level_flags & 1))
continue;
ret= MY_FUNCTION_NAME(strnncoll_onelevel)(cs, &cs->uca->level[i],
s, slen, t, tlen,
t_is_prefix);
if (ret)
return ret;
}
return 0;
}
/*
Compares two strings according to the collation,
ignoring trailing spaces.
SYNOPSIS:
strnncollsp_onelevel()
cs Character set information
level UCA weight level
s First string
slen First string length
t Second string
tlen Seconf string length
level DUCETweight level
NOTES:
Works exactly the same with my_strnncoll_uca(),
but ignores trailing spaces.
In the while() comparison these situations are possible:
1. (s_res>0) and (t_res>0) and (s_res == t_res)
Weights are the same so far, continue comparison
2. (s_res>0) and (t_res>0) and (s_res!=t_res)
A difference has been found, return.
3. (s_res>0) and (t_res<0)
We have reached the end of the second string, or found
an illegal multibyte sequence in the second string.
Compare the first string to an infinite array of
space characters until difference is found, or until
the end of the first string.
4. (s_res<0) and (t_res>0)
We have reached the end of the first string, or found
an illegal multibyte sequence in the first string.
Compare the second string to an infinite array of
space characters until difference is found or until
the end of the second steing.
5. (s_res<0) and (t_res<0)
Both scanners returned -1. It means we have riched
the end-of-string of illegal-sequence in both strings
at the same time. Return 0, strings are equal.
RETURN
Difference between two strings, according to the collation:
0 - means strings are equal
negative number - means the first string is smaller
positive number - means the first string is bigger
*/
static int
MY_FUNCTION_NAME(strnncollsp_onelevel)(CHARSET_INFO *cs,
const MY_UCA_WEIGHT_LEVEL *level,
const uchar *s, size_t slen,
const uchar *t, size_t tlen)
{
my_uca_scanner sscanner, tscanner;
my_uca_scanner_param param;
int s_res, t_res;
#if MY_UCA_ASCII_OPTIMIZE
{
size_t prefix= my_uca_level_booster_equal_prefix_length(level->booster,
s, slen, t, tlen);
s+= prefix, slen-= prefix;
t+= prefix, tlen-= prefix;
}
#endif
my_uca_scanner_param_init(&param, cs, level);
my_uca_scanner_init_any(&sscanner, s, slen);
my_uca_scanner_init_any(&tscanner, t, tlen);
do
{
s_res= MY_FUNCTION_NAME(scanner_next)(&sscanner, &param);
t_res= MY_FUNCTION_NAME(scanner_next)(&tscanner, &param);
} while ( s_res == t_res && s_res >0);
if (s_res > 0 && t_res < 0)
{
/* Calculate weight for SPACE character */
t_res= my_space_weight(level);
/* compare the first string to spaces */
do
{
if (s_res != t_res)
return (s_res - t_res);
s_res= MY_FUNCTION_NAME(scanner_next)(&sscanner, &param);
} while (s_res > 0);
return 0;
}
if (s_res < 0 && t_res > 0)
{
/* Calculate weight for SPACE character */
s_res= my_space_weight(level);
/* compare the second string to spaces */
do
{
if (s_res != t_res)
return (s_res - t_res);
t_res= MY_FUNCTION_NAME(scanner_next)(&tscanner, &param);
} while (t_res > 0);
return 0;
}
return ( s_res - t_res );
}
/*
One-level, PAD SPACE
*/
static int
MY_FUNCTION_NAME(strnncollsp)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen)
{
return MY_FUNCTION_NAME(strnncollsp_onelevel)(cs, &cs->uca->level[0],
s, slen, t, tlen);
}
/*
One-level, NO PAD
*/
static int
MY_FUNCTION_NAME(strnncollsp_nopad)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen)
{
return MY_FUNCTION_NAME(strnncoll_onelevel)(cs, &cs->uca->level[0],
s, slen, t, tlen, FALSE);
}
/*
Multi-level, PAD SPACE
*/
static int
MY_FUNCTION_NAME(strnncollsp_multilevel)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen)
{
uint i, level_flags= cs->levels_for_order;
for (i= 0; level_flags; i++, level_flags>>= 1)
{
int ret;
if (!(level_flags & 1))
continue;
ret= MY_FUNCTION_NAME(strnncollsp_onelevel)(cs, &cs->uca->level[i],
s, slen, t, tlen);
if (ret)
return ret;
}
return 0;
}
/*
Multi-level, NO PAD
*/
static int
MY_FUNCTION_NAME(strnncollsp_nopad_multilevel)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen)
{
uint i, level_flags;
int ret;
/* Compare only the primary level using NO PAD */
if ((ret= MY_FUNCTION_NAME(strnncoll_onelevel)(cs, &cs->uca->level[0],
s, slen, t, tlen, FALSE)))
return ret;
/*
Compare the other levels using PAD SPACE.
These are Unicode-14.0.0 DUCTET weights:
0020 ; [*0209.0020.0002] # SPACE
0035 ; [.2070.0020.0002] # DIGIT FIVE
248C ; [.2070.0020.0004][*0281.0020.0004] # DIGIT FIVE FULL STOP
0041 ; [.2075.0020.0008] # LATIN CAPITAL LETTER A
0061 ; [.2075.0020.0002] # LATIN SMALL LETTER A
00C1 ; [.2075.0020.0008][.0000.0024.0002] # LATIN CAPITAL LETTER A WITH ACUTE
00E1 ; [.2075.0020.0002][.0000.0024.0002] # LATIN SMALL LETTER A WITH ACUTE
Examples demonstrating that it's important to use PAD SPACE
on the tertiary level:
The third level weights for "SMALL LETTER A"
- U+0061 produces one weight 0002
- U+00E1 produces two weights 0002+0002
For _ai_cs collations these two letters must be equal.
Therefore, the difference in trailing 0002 should be ignored.
The third level weights for "CAPITAL LETTER A"
- U+0041 produces one weight 0008
- U+00C1 produces two weights 0008+0002
For _ai_cs collations these two letters must be equal.
Therefore, the difference in trailing 0002 should be ignored.
Examples demonstrating that it's important to use PAD SPACE
on the secondary level:
When we implement variable shifted alternative weighting collations,
U+0035 will be equal to U+248C on the primary level in these collations.
The second level weights for "DIGIT FIVE" are:
- U+0035 produces one weight 0020
- U+248C produces two weights 0020+0020.
The difference for these two characters must be found only
on the tertiary level. Therefore, the trailing 0020 should be ignored.
*/
for (i= 1, level_flags= cs->levels_for_order >> 1;
level_flags;
i++, level_flags>>= 1)
{
if (!(level_flags & 1))
continue;
ret= MY_FUNCTION_NAME(strnncollsp_onelevel)(cs, &cs->uca->level[i],
s, slen, t, tlen);
if (ret)
return ret;
}
return 0;
}
/*
Scan the next weight and perform space padding
or trimming according to "nchars".
*/
static inline weight_and_nchars_t
MY_FUNCTION_NAME(scanner_next_pad_trim)(my_uca_scanner *scanner,
my_uca_scanner_param *param,
size_t nchars,
uint flags,
uint *generated)
{
weight_and_nchars_t res;
if (nchars > 0 ||
scanner->wbeg[0] /* Some weights from a previous expansion left */)
{
if ((res= MY_FUNCTION_NAME(scanner_next_with_nchars)(scanner, param,
nchars)).weight < 0)
{
/*
We reached the end of the string, but the caller wants more weights.
Perform space padding.
*/
res.weight=
flags & MY_STRNNCOLLSP_NCHARS_EMULATE_TRIMMED_TRAILING_SPACES ?
my_space_weight(param->level) : 0;
(*generated)++;
res.nchars++; /* Count all ignorable characters and the padded space */
if (res.nchars > nchars)
{
/*
We scanned a number of ignorable characters at the end of the
string and reached the "nchars" limit, so the virtual padded space
does not fit. This is possible with CONCAT('a', x'00') with
nchars=2 on the second iteration when we scan the x'00'.
*/
if (param->cs->state & MY_CS_NOPAD)
res.weight= 0;
res.nchars= (uint) nchars;
}
}
else if (res.nchars > nchars)
{
/*
We scanned the next collation element, but it does not fit into
the "nchars" limit. This is possible in case of:
- A contraction, e.g. Czech 'ch' with nchars=1
- A sequence of ignorable characters followed by non-ignorable ones,
e.g. CONCAT(x'00','a') with nchars=1.
Perform trimming.
*/
res.weight= param->cs->state & MY_CS_NOPAD ?
0 : my_space_weight(param->level);
res.nchars= (uint) nchars;
(*generated)++;
}
}
else
{
/* The caller wants nchars==0. Perform trimming. */
res.weight= param->cs->state & MY_CS_NOPAD ?
0 : my_space_weight(param->level);
res.nchars= 0;
(*generated)++;
}
return res;
}
static int
MY_FUNCTION_NAME(strnncollsp_nchars_onelevel)(CHARSET_INFO *cs,
const MY_UCA_WEIGHT_LEVEL *level,
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
size_t nchars,
uint flags)
{
my_uca_scanner sscanner;
my_uca_scanner tscanner;
my_uca_scanner_param param;
size_t s_nchars_left= nchars;
size_t t_nchars_left= nchars;
/*
TODO: strnncollsp_nchars_onelevel
#if MY_UCA_ASCII_OPTIMIZE
{
size_t prefix= my_uca_level_booster_equal_prefix_length(level->booster,
s, slen, t, tlen);
s+= prefix, slen-= prefix;
t+= prefix, tlen-= prefix;
}
#endif
*/
my_uca_scanner_param_init(&param, cs, level);
my_uca_scanner_init_any(&sscanner, s, slen);
my_uca_scanner_init_any(&tscanner, t, tlen);
for ( ; ; )
{
weight_and_nchars_t s_res;
weight_and_nchars_t t_res;
uint generated= 0;
int diff;
s_res= MY_FUNCTION_NAME(scanner_next_pad_trim)(&sscanner, &param,
s_nchars_left,
flags, &generated);
t_res= MY_FUNCTION_NAME(scanner_next_pad_trim)(&tscanner, &param,
t_nchars_left,
flags, &generated);
if ((diff= (s_res.weight - t_res.weight)))
return diff;
if (generated == 2)
{
if ((cs->state & MY_CS_NOPAD) &&
(flags & MY_STRNNCOLLSP_NCHARS_EMULATE_TRIMMED_TRAILING_SPACES))
{
/*
Both values are auto-generated. There's no real data any more.
We need to handle the remaining virtual trailing spaces.
The two strings still have s_nchars_left and t_nchars_left imaginary
trailing spaces at the end. If s_nchars_left != t_nchars_left,
the strings will be not equal in case of a NOPAD collation.
Example:
"B" is German "U+00DF LATIN SMALL LETTER SHARP S"
When we have these values in a
CHAR(3) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_nopad_ci
column:
'B ' (one character, two trailing spaces)
'ss ' (two characters, one trailing space)
The 'B ' is greater than the 'ss '.
They are compared in the following steps:
1. 'B' == 'ss'
2. ' ' == ' '
3. ' ' > ''
We need to emulate the same behavior in this function even if
it's called with strings 'B' and 'ss' (with space trimmed).
The side which has more remaining virtual spaces at the end
is greater.
*/
if (s_nchars_left < t_nchars_left)
return -1;
if (s_nchars_left > t_nchars_left)
return +1;
}
return 0;
}
DBUG_ASSERT(s_nchars_left >= s_res.nchars);
DBUG_ASSERT(t_nchars_left >= t_res.nchars);
s_nchars_left-= s_res.nchars;
t_nchars_left-= t_res.nchars;
}
return 0;
}
/*
One-level collations.
*/
static int
MY_FUNCTION_NAME(strnncollsp_nchars)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
size_t nchars,
uint flags)
{
return MY_FUNCTION_NAME(strnncollsp_nchars_onelevel)(cs, &cs->uca->level[0],
s, slen, t, tlen,
nchars, flags);
}
/*
Multi-level collations.
*/
static int
MY_FUNCTION_NAME(strnncollsp_nchars_multilevel)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
const uchar *t, size_t tlen,
size_t nchars,
uint flags)
{
uint i, level_flags= cs->levels_for_order;
for (i= 0; level_flags; i++, level_flags>>= 1)
{
int ret;
if (!(level_flags & 1))
continue;
ret= MY_FUNCTION_NAME(strnncollsp_nchars_onelevel)(cs,
&cs->uca->level[i],
s, slen,
t, tlen,
nchars, flags);
if (ret)
return ret;
}
return 0;
}
/*
Calculates hash value for the given string,
according to the collation, and ignoring trailing spaces.
SYNOPSIS:
hash_sort()
cs Character set information
s String
slen String's length
n1 First hash parameter
n2 Second hash parameter
NOTES:
Scans consequently weights and updates
hash parameters n1 and n2. In a case insensitive collation,
upper and lower case of the same letter will return the same
weight sequence, and thus will produce the same hash values
in n1 and n2.
This functions is used for one-level and for multi-level collations.
We intentionally use only primary level in multi-level collations.
This helps to have PARTITION BY KEY put primarily equal records
into the same partition. E.g. in utf8mb3_thai_520_ci records that differ
only in tone marks go into the same partition.
RETURN
N/A
*/
static void
MY_FUNCTION_NAME(hash_sort)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
ulong *nr1, ulong *nr2)
{
int s_res;
my_uca_scanner scanner;
my_uca_scanner_param param;
int space_weight= my_space_weight(&cs->uca->level[0]);
register ulong m1= *nr1, m2= *nr2;
my_uca_scanner_param_init(&param, cs, &cs->uca->level[0]);
my_uca_scanner_init_any(&scanner, s, slen);
while ((s_res= MY_FUNCTION_NAME(scanner_next)(&scanner, &param)) >0)
{
if (s_res == space_weight)
{
/* Combine all spaces to be able to skip end spaces */
uint count= 0;
do
{
count++;
if ((s_res= MY_FUNCTION_NAME(scanner_next)(&scanner, &param)) <= 0)
{
/* Skip strings at end of string */
goto end;
}
}
while (s_res == space_weight);
/* Add back that has for the space characters */
do
{
/*
We can't use MY_HASH_ADD_16() here as we, because of a misstake
in the original code, where we added the 16 byte variable the
opposite way. Changing this would cause old partitioned tables
to fail.
*/
MY_HASH_ADD(m1, m2, space_weight >> 8);
MY_HASH_ADD(m1, m2, space_weight & 0xFF);
}
while (--count != 0);
}
/* See comment above why we can't use MY_HASH_ADD_16() */
MY_HASH_ADD(m1, m2, s_res >> 8);
MY_HASH_ADD(m1, m2, s_res & 0xFF);
}
end:
*nr1= m1;
*nr2= m2;
}
static void
MY_FUNCTION_NAME(hash_sort_nopad)(CHARSET_INFO *cs,
const uchar *s, size_t slen,
ulong *nr1, ulong *nr2)
{
int s_res;
my_uca_scanner scanner;
my_uca_scanner_param param;
register ulong m1= *nr1, m2= *nr2;
my_uca_scanner_param_init(&param, cs, &cs->uca->level[0]);
my_uca_scanner_init_any(&scanner, s, slen);
while ((s_res= MY_FUNCTION_NAME(scanner_next)(&scanner, &param)) >0)
{
/* See comment above why we can't use MY_HASH_ADD_16() */
MY_HASH_ADD(m1, m2, s_res >> 8);
MY_HASH_ADD(m1, m2, s_res & 0xFF);
}
*nr1= m1;
*nr2= m2;
}
/*
For the given string creates its "binary image", suitable
to be used in binary comparison, i.e. in memcmp().
SYNOPSIS:
my_strnxfrm_uca()
cs Character set information
dst Where to write the image
dstlen Space available for the image, in bytes
src The source string
srclen Length of the source string, in bytes
NOTES:
In a loop, scans weights from the source string and writes
them into the binary image. In a case insensitive collation,
upper and lower cases of the same letter will produce the
same image subsequences. When we have reached the end-of-string
or found an illegal multibyte sequence, the loop stops.
It is impossible to restore the original string using its
binary image.
Binary images are used for bulk comparison purposes,
e.g. in ORDER BY, when it is more efficient to create
a binary image and use it instead of weight scanner
for the original strings for every comparison.
RETURN
Number of bytes that have been written into the binary image.
*/
static uchar *
MY_FUNCTION_NAME(strnxfrm_onelevel_internal)(CHARSET_INFO *cs,
MY_UCA_WEIGHT_LEVEL *level,
uchar *dst, uchar *de,
uint *nweights,
const uchar *src, size_t srclen)
{
my_uca_scanner scanner;
my_uca_scanner_param param;
int s_res;
DBUG_ASSERT(src || !srclen);
#if MY_UCA_ASCII_OPTIMIZE && !MY_UCA_COMPILE_CONTRACTIONS
/*
Fast path for the ASCII range with no contractions.
*/
{
const uchar *de2= de - 1; /* Last position where 2 bytes fit */
const uint16 *weights0= level->weights[0];
uint lengths0= level->lengths[0];
for ( ; ; src++, srclen--)
{
const uint16 *weight;
if (!srclen || !*nweights)
return dst; /* Done */
if (*src > 0x7F)
break; /* Non-ASCII */
weight= weights0 + (((uint) *src) * lengths0);
if (!(s_res= *weight))
continue; /* Ignorable */
if (weight[1]) /* Expansion (e.g. in a user defined collation */
break;
/* Here we have a character with extactly one 2-byte UCA weight */
if (dst < de2) /* Most typical case is when both bytes fit */
{
*dst++= s_res >> 8;
*dst++= s_res & 0xFF;
(*nweights)--;
continue;
}
if (dst >= de) /* No space left in "dst" */
return dst;
*dst++= s_res >> 8; /* There is space only for one byte */
(*nweights)--;
return dst;
}
}
#endif
my_uca_scanner_param_init(&param, cs, level);
my_uca_scanner_init_any(&scanner, src, srclen);
for (; dst < de && *nweights &&
(s_res= MY_FUNCTION_NAME(scanner_next)(&scanner, &param)) > 0 ;
(*nweights)--)
{
*dst++= s_res >> 8;
if (dst < de)
*dst++= s_res & 0xFF;
}
return dst;
}
static uchar *
MY_FUNCTION_NAME(strnxfrm_onelevel)(CHARSET_INFO *cs,
MY_UCA_WEIGHT_LEVEL *level,
uchar *dst, uchar *de, uint nweights,
const uchar *src, size_t srclen, uint flags)
{
uchar *d0= dst;
dst= MY_FUNCTION_NAME(strnxfrm_onelevel_internal)(cs, level,
dst, de, &nweights,
src, srclen);
DBUG_ASSERT(dst <= de);
if (dst < de && nweights && (flags & MY_STRXFRM_PAD_WITH_SPACE))
dst= my_strnxfrm_uca_padn(dst, de, nweights, my_space_weight(level));
DBUG_ASSERT(dst <= de);
my_strxfrm_desc_and_reverse(d0, dst, flags, 0);
return dst;
}
static uchar *
MY_FUNCTION_NAME(strnxfrm_nopad_onelevel)(CHARSET_INFO *cs,
MY_UCA_WEIGHT_LEVEL *level,
uchar *dst, uchar *de, uint nweights,
const uchar *src, size_t srclen,
uint flags)
{
uchar *d0= dst;
dst= MY_FUNCTION_NAME(strnxfrm_onelevel_internal)(cs, level,
dst, de, &nweights,
src, srclen);
DBUG_ASSERT(dst <= de);
/* Pad with the minimum possible weight on this level */
if (dst < de && nweights && (flags & MY_STRXFRM_PAD_WITH_SPACE))
dst= my_strnxfrm_uca_padn(dst, de, nweights, min_weight_on_level(level));
DBUG_ASSERT(dst <= de);
my_strxfrm_desc_and_reverse(d0, dst, flags, 0);
return dst;
}
static size_t
MY_FUNCTION_NAME(strnxfrm)(CHARSET_INFO *cs,
uchar *dst, size_t dstlen, uint nweights,
const uchar *src, size_t srclen, uint flags)
{
uchar *d0= dst;
uchar *de= dst + dstlen;
/*
There are two ways to handle trailing spaces for PAD SPACE collations:
1. Keep trailing spaces as they are, so have strnxfrm_onelevel() scan
spaces as normal characters. This will call scanner_next() for every
trailing space and calculate its weight using UCA weights.
2. Strip trailing spaces before calling strnxfrm_onelevel(), as it will
append weights for implicit spaces anyway, up to the desired key size.
This will effectively generate exactly the same sortable key result.
The latter is much faster.
*/
if (flags & MY_STRXFRM_PAD_WITH_SPACE)
srclen= my_ci_lengthsp(cs, (const char*) src, srclen);
dst= MY_FUNCTION_NAME(strnxfrm_onelevel)(cs, &cs->uca->level[0],
dst, de, nweights,
src, srclen, flags);
/*
This can probably be changed to memset(dst, 0, de - dst),
like my_strnxfrm_uca_multilevel() does.
*/
if ((flags & MY_STRXFRM_PAD_TO_MAXLEN) && dst < de)
dst= my_strnxfrm_uca_pad(dst, de, my_space_weight(&cs->uca->level[0]));
return dst - d0;
}
static size_t
MY_FUNCTION_NAME(strnxfrm_nopad)(CHARSET_INFO *cs,
uchar *dst, size_t dstlen,
uint nweights,
const uchar *src, size_t srclen,
uint flags)
{
uchar *d0= dst;
uchar *de= dst + dstlen;
dst= MY_FUNCTION_NAME(strnxfrm_nopad_onelevel)(cs, &cs->uca->level[0],
dst, de, nweights,
src, srclen, flags);
if ((flags & MY_STRXFRM_PAD_TO_MAXLEN) && dst < de)
{
memset(dst, 0, de - dst);
dst= de;
}
return dst - d0;
}
static size_t
MY_FUNCTION_NAME(strnxfrm_multilevel)(CHARSET_INFO *cs,
uchar *dst, size_t dstlen,
uint nweights,
const uchar *src, size_t srclen,
uint flags)
{
uint level_flags= cs->levels_for_order;
uchar *d0= dst;
uchar *de= dst + dstlen;
uint current_level;
for (current_level= 0; level_flags; current_level++, level_flags>>= 1)
{
if (!(level_flags & 1))
continue;
if (!(flags & MY_STRXFRM_LEVEL_ALL) ||
(flags & (MY_STRXFRM_LEVEL1 << current_level)))
dst= cs->state & MY_CS_NOPAD ?
MY_FUNCTION_NAME(strnxfrm_nopad_onelevel)(cs,
&cs->uca->level[current_level],
dst, de, nweights,
src, srclen, flags) :
MY_FUNCTION_NAME(strnxfrm_onelevel)(cs,
&cs->uca->level[current_level],
dst, de, nweights,
src, srclen, flags);
}
if (dst < de && (flags & MY_STRXFRM_PAD_TO_MAXLEN))
{
memset(dst, 0, de - dst);
dst= de;
}
return dst - d0;
}
/*
One-level, PAD SPACE
*/
MY_COLLATION_HANDLER MY_FUNCTION_NAME(collation_handler)=
{
MY_UCA_COLL_INIT,
MY_FUNCTION_NAME(strnncoll),
MY_FUNCTION_NAME(strnncollsp),
MY_FUNCTION_NAME(strnncollsp_nchars),
MY_FUNCTION_NAME(strnxfrm),
my_strnxfrmlen_any_uca,
MY_LIKE_RANGE,
my_wildcmp_uca,
my_instr_mb,
MY_FUNCTION_NAME(hash_sort),
my_propagate_complex,
my_min_str_mb_simple,
my_max_str_mb_simple,
my_ci_get_id_uca,
my_ci_get_collation_name_uca
};
/*
One-level, NO PAD
For character sets with mbminlen==1 use MY_LIKE_RANGE=my_like_range_mb
For character sets with mbminlen>=2 use MY_LIKE_RANGE=my_like_range_generic
*/
MY_COLLATION_HANDLER MY_FUNCTION_NAME(collation_handler_nopad)=
{
MY_UCA_COLL_INIT,
MY_FUNCTION_NAME(strnncoll),
MY_FUNCTION_NAME(strnncollsp_nopad),
MY_FUNCTION_NAME(strnncollsp_nchars),
MY_FUNCTION_NAME(strnxfrm_nopad),
my_strnxfrmlen_any_uca,
MY_LIKE_RANGE, /* my_like_range_mb or my_like_range_generic */
my_wildcmp_uca,
my_instr_mb,
MY_FUNCTION_NAME(hash_sort_nopad),
my_propagate_complex,
my_min_str_mb_simple_nopad,
my_max_str_mb_simple,
my_ci_get_id_uca,
my_ci_get_collation_name_uca
};
/*
Multi-level, PAD SPACE
*/
MY_COLLATION_HANDLER MY_FUNCTION_NAME(collation_handler_multilevel)=
{
MY_UCA_COLL_INIT,
MY_FUNCTION_NAME(strnncoll_multilevel),
MY_FUNCTION_NAME(strnncollsp_multilevel),
MY_FUNCTION_NAME(strnncollsp_nchars_multilevel),
MY_FUNCTION_NAME(strnxfrm_multilevel),
my_strnxfrmlen_any_uca_multilevel,
MY_LIKE_RANGE,
my_wildcmp_uca,
my_instr_mb,
MY_FUNCTION_NAME(hash_sort),
my_propagate_complex,
my_min_str_mb_simple,
my_max_str_mb_simple,
my_ci_get_id_uca,
my_ci_get_collation_name_uca
};
/*
Multi-level, NO PAD
*/
MY_COLLATION_HANDLER MY_FUNCTION_NAME(collation_handler_nopad_multilevel)=
{
MY_UCA_COLL_INIT,
MY_FUNCTION_NAME(strnncoll_multilevel),
MY_FUNCTION_NAME(strnncollsp_nopad_multilevel),
MY_FUNCTION_NAME(strnncollsp_nchars_multilevel),
MY_FUNCTION_NAME(strnxfrm_multilevel),
my_strnxfrmlen_any_uca_multilevel,
MY_LIKE_RANGE,
my_wildcmp_uca,
my_instr_mb,
MY_FUNCTION_NAME(hash_sort),
my_propagate_complex,
my_min_str_mb_simple_nopad,
my_max_str_mb_simple,
my_ci_get_id_uca,
my_ci_get_collation_name_uca
};
MY_COLLATION_HANDLER_PACKAGE MY_FUNCTION_NAME(package)=
{
&MY_FUNCTION_NAME(collation_handler),
&MY_FUNCTION_NAME(collation_handler_nopad),
&MY_FUNCTION_NAME(collation_handler_multilevel),
&MY_FUNCTION_NAME(collation_handler_nopad_multilevel)
};
#undef MY_FUNCTION_NAME
#undef MY_MB_WC
#undef MY_LIKE_RANGE
#undef MY_UCA_ASCII_OPTIMIZE
#undef MY_UCA_COMPILE_CONTRACTIONS
#undef MY_UCA_COLL_INIT
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