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https://github.com/MariaDB/server.git
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8951f7d940
- Adding automatic conversion operator from LEX_STRING to LEX_CSTRING Now a LEX_STRING can be passed directly to any function expecting a LEX_CSTRING parameter passed by value or by reference. - Removing a number of duplicate methods accepting LEX_STRING. Now the code used the LEX_CSTRING version.
81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
/*
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Copyright (c) 2018, 2020, 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 02110-1301 USA */
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#ifndef VERS_STRING_INCLUDED
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#define VERS_STRING_INCLUDED
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#include "lex_string.h"
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/*
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LEX_CSTRING with comparison semantics.
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*/
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// db and table names: case sensitive (or insensitive) in table_alias_charset
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struct Compare_table_names
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{
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int operator()(const LEX_CSTRING& a, const LEX_CSTRING& b) const
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{
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DBUG_ASSERT(a.str[a.length] == 0);
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DBUG_ASSERT(b.str[b.length] == 0);
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return table_alias_charset->strnncoll(a.str, a.length,
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b.str, b.length);
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}
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};
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// column names and other identifiers: case insensitive in system_charset_info
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struct Compare_identifiers
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{
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int operator()(const LEX_CSTRING& a, const LEX_CSTRING& b) const
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{
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DBUG_ASSERT(a.str != NULL);
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DBUG_ASSERT(b.str != NULL);
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DBUG_ASSERT(a.str[a.length] == 0);
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DBUG_ASSERT(b.str[b.length] == 0);
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return my_strcasecmp(system_charset_info, a.str, b.str);
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}
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};
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template <class Compare>
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struct Lex_cstring_with_compare : public Lex_cstring
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{
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public:
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Lex_cstring_with_compare() = default;
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Lex_cstring_with_compare(const char *_str, size_t _len) :
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Lex_cstring(_str, _len)
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{ }
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Lex_cstring_with_compare(const LEX_CSTRING src) : Lex_cstring(src.str, src.length)
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{ }
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Lex_cstring_with_compare(const char *_str) : Lex_cstring(_str, strlen(_str))
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{ }
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bool streq(const Lex_cstring_with_compare& b) const
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{
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return Lex_cstring::length == b.length && 0 == Compare()(*this, b);
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}
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operator const char* () const
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{
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return str;
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}
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operator bool () const
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{
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return str != NULL;
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}
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};
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typedef Lex_cstring_with_compare<Compare_identifiers> Lex_ident;
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typedef Lex_cstring_with_compare<Compare_table_names> Lex_table_name;
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#endif // VERS_STRING_INCLUDED
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