thanks a lot！
mysql not use lex for tokenizing, only use sql_lex.cc and the
lex_hash.h to supply the same interface as lex/flex supplied? and the
up level also use yacc?
I can find sql_yacc.yy, Is it equal .y file? when I see other yacc
demo, yacc file always named .y
In websit http://forge.mysql.com/wiki/MySQL_Internals,I can't find
subject helpfull for this Lexical and grammatical implement
在 2010年11月17日 下午2:46，Hartmut Holzgraefe <hartmut.holzgraefe@stripped>
> On 11/17/2010 06:33 AM, tc yang wrote:
>> 在 2010年11月17日 上午11:22，tc yang<yangtc.sub@stripped>写道：
>>> I recently study mysql source code, grammatical and semantic
> analysis，mysql source version 5.57
>>> but I can't find .l file for lex and .y for yacc in mysql
> level，innbase dictonary have /pars0lex.l, why mysql don't have lex source?
>>> in sql directory only have sql_lex.cc,this is generated from lex source
> ? and where is the lex source(".l" file), and how is generated?
> mysql does not use lex/flex for tokenizing, it uses a self made scanner
> instead, which consists of sql_lex.cc and the lex_hash.h header
> generated by the bundled gen_lex_hash tool
> the lex and yacc files in the innobase stem back from the time when
> InnoDB was meant to be a standalone SQL database, most of this parser
> is not in use anymore, parts of it are still needed to parse foreign
> key constraint definitions though as far as i remember.
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