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75f25e4ca7
This patch adds a way to override default collations (or "character set collations") for desired character sets. The SQL standard says: > Each collation known in an SQL-environment is applicable to one > or more character sets, and for each character set, one or more > collations are applicable to it, one of which is associated with > it as its character set collation. In MariaDB, character set collations has been hard-coded so far, e.g. utf8mb4_general_ci has been a hard-coded character set collation for utf8mb4. This patch allows to override (globally per server, or per session) character set collations, so for example, uca1400_ai_ci can be set as a character set collation for Unicode character sets (instead of compiled xxx_general_ci). The array of overridden character set collations is stored in a new (session and global) system variable @@character_set_collations and can be set as a comma separated list of charset=collation pairs, e.g.: SET @@character_set_collations='utf8mb3=uca1400_ai_ci,utf8mb4=uca1400_ai_ci'; The variable is empty by default, which mean use the hard-coded character set collations (e.g. utf8mb4_general_ci for utf8mb4). The variable can also be set globally by passing to the server startup command line, and/or in my.cnf.
85 lines
2 KiB
C++
85 lines
2 KiB
C++
/* Copyright (c) 2023, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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#ifndef SIMPLE_TOKENIZER_INCLUDED
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#define SIMPLE_TOKENIZER_INCLUDED
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class Simple_tokenizer
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{
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const char *m_ptr;
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const char *m_end;
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public:
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Simple_tokenizer(const char *str, size_t length)
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:m_ptr(str), m_end(str + length)
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{ }
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const char *ptr() const
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{
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return m_ptr;
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}
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bool eof() const
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{
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return m_ptr >= m_end;
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}
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void get_spaces()
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{
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for ( ; !eof(); m_ptr++)
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{
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if (m_ptr[0] != ' ')
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break;
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}
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}
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bool is_ident_start(char ch) const
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{
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return (ch >= 'a' && ch <= 'z') ||
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(ch >= 'A' && ch <= 'Z') ||
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ch == '_';
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}
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bool is_ident_body(char ch) const
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{
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return is_ident_start(ch) ||
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(ch >= '0' && ch <= '9');
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}
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bool is_ident_start() const
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{
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return !eof() && is_ident_start(*m_ptr);
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}
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bool is_ident_body() const
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{
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return !eof() && is_ident_body(*m_ptr);
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}
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LEX_CSTRING get_ident()
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{
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get_spaces();
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if (!is_ident_start())
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return {m_ptr,0};
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const char *start= m_ptr++;
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for ( ; is_ident_body(); m_ptr++)
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{ }
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LEX_CSTRING res= {start, (size_t) (m_ptr - start)};
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return res;
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}
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bool get_char(char ch)
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{
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get_spaces();
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if (eof() || *m_ptr != ch)
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return true;
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m_ptr++;
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return false;
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}
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};
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#endif // SIMPLE_TOKENIZER_INCLUDED
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