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/* Copyright (C) 2004 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "parse.h"
#include <string.h>
enum Token
{
TOK_FLUSH = 0,
TOK_INSTANCE,
TOK_INSTANCES,
TOK_OPTIONS,
TOK_START,
TOK_STATUS,
TOK_STOP,
TOK_SHOW,
TOK_NOT_FOUND, // must be after all tokens
TOK_END
};
static const char *tokens[]= {
"FLUSH",
"INSTANCE",
"INSTANCES",
"OPTIONS",
"START",
"STATUS",
"STOP",
"SHOW",
};
/*
tries to find next word in the text
if found, returns the beginning and puts word length to word_len argument.
if not found returns pointer to first non-space or to '\0', word_len == 0
*/
inline void get_word(const char **text, uint *word_len)
{
const char *word_end;
/* skip space */
while (my_isspace(default_charset_info, **text))
++(*text);
word_end= *text;
while (my_isalnum(default_charset_info, *word_end))
++word_end;
*word_len= word_end - *text;
}
/*
Returns token no if word corresponds to some token, otherwise returns
TOK_NOT_FOUND
*/
inline Token find_token(const char *word, uint word_len)
{
int i= 0;
do
{
if (strncasecmp(tokens[i], word, word_len) == 0)
break;
}
while (++i < TOK_NOT_FOUND);
return (Token) i;
}
Token get_token(const char **text, uint *word_len)
{
get_word(text, word_len);
if (*word_len)
return find_token(*text, *word_len);
return TOK_END;
}
Token shift_token(const char **text, uint *word_len)
{
Token save= get_token(text, word_len);
(*text)+= *word_len;
return save;
}
void print_token(const char *token, uint tok_len)
{
for (uint i= 0; i < tok_len; ++i)
printf("%c", token[i]);
}
int get_text_id(const char **text, uint *word_len, const char **id)
{
get_word(text, word_len);
if (word_len == 0)
return 1;
*id= *text;
return 0;
}
Command *parse_command(Command_factory *factory, const char *text)
{
uint word_len;
const char *instance_name;
uint instance_name_len;
Command *command;
const char *saved_text= text;
Token tok1= shift_token(&text, &word_len);
switch (tok1) {
case TOK_START: // fallthrough
case TOK_STOP:
if (shift_token(&text, &word_len) != TOK_INSTANCE)
goto syntax_error;
get_word(&text, &word_len);
if (word_len == 0)
goto syntax_error;
instance_name= text;
instance_name_len= word_len;
text+= word_len;
/* it should be the end of command */
get_word(&text, &word_len);
if (word_len)
goto syntax_error;
command= (tok1 == TOK_START) ? (Command *)
factory->new_Start_instance(instance_name, instance_name_len):
(Command *)
factory->new_Stop_instance(instance_name, instance_name_len);
break;
case TOK_FLUSH:
if (shift_token(&text, &word_len) != TOK_INSTANCES)
goto syntax_error;
get_word(&text, &word_len);
if (word_len)
goto syntax_error;
command= factory->new_Flush_instances();
break;
case TOK_SHOW:
switch (shift_token(&text, &word_len)) {
case TOK_INSTANCES:
get_word(&text, &word_len);
if (word_len)
goto syntax_error;
command= factory->new_Show_instances();
break;
case TOK_INSTANCE:
switch (Token tok2= shift_token(&text, &word_len)) {
case TOK_OPTIONS:
case TOK_STATUS:
get_text_id(&text, &instance_name_len, &instance_name);
text+= instance_name_len;
get_word(&text, &word_len);
if (word_len)
goto syntax_error;
command= (tok2 == TOK_STATUS) ? (Command *)
factory->new_Show_instance_status(instance_name,
instance_name_len):
(Command *)
factory->new_Show_instance_options(instance_name,
instance_name_len);
break;
default:
goto syntax_error;
}
break;
default:
goto syntax_error;
}
break;
default:
syntax_error:
command= factory->new_Syntax_error();
}
return command;
}
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