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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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include "parse.h"
#include "commands.h"
#include <string.h>
enum Token
{
TOK_ERROR= 0, /* Encodes the "ERROR" word, it doesn't indicate error. */
TOK_FILES,
TOK_FLUSH,
TOK_GENERAL,
TOK_INSTANCE,
TOK_INSTANCES,
TOK_LOG,
TOK_OPTIONS,
TOK_SET,
TOK_SLOW,
TOK_START,
TOK_STATUS,
TOK_STOP,
TOK_SHOW,
TOK_UNSET,
TOK_NOT_FOUND, // must be after all tokens
TOK_END
};
struct tokens_st
{
uint length;
const char *tok_name;
};
static struct tokens_st tokens[]= {
{5, "ERROR"},
{5, "FILES"},
{5, "FLUSH"},
{7, "GENERAL"},
{8, "INSTANCE"},
{9, "INSTANCES"},
{3, "LOG"},
{7, "OPTIONS"},
{3, "SET"},
{4, "SLOW"},
{5, "START"},
{6, "STATUS"},
{4, "STOP"},
{4, "SHOW"},
{5, "UNSET"}
};
/*
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 (my_strnncoll(default_charset_info, (const uchar *) tokens[i].tok_name,
tokens[i].length, (const uchar *) 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;
}
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(Instance_map *map, const char *text)
{
uint word_len;
const char *instance_name;
uint instance_name_len;
const char *option;
uint option_len;
const char *option_value;
uint option_value_len;
const char *log_size;
Command *command;
bool skip= false;
const char *tmp;
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, NONSPACE);
if (word_len)
goto syntax_error;
if (tok1 == TOK_START)
command= new Start_instance(map, instance_name, instance_name_len);
else
command= new Stop_instance(map, 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, NONSPACE);
if (word_len)
goto syntax_error;
command= new Flush_instances(map);
break;
case TOK_UNSET:
skip= true;
case TOK_SET:
if (get_text_id(&text, &instance_name_len, &instance_name))
goto syntax_error;
text+= instance_name_len;
/* the next token should be a dot */
get_word(&text, &word_len);
if (*text != '.')
goto syntax_error;
text++;
get_word(&text, &option_len, NONSPACE);
option= text;
if ((tmp= strchr(text, '=')) != NULL)
option_len= tmp - text;
text+= option_len;
get_word(&text, &word_len);
if (*text == '=')
{
text++; /* skip '=' */
get_word(&text, &option_value_len, NONSPACE);
option_value= text;
text+= option_value_len;
}
else
{
option_value= "";
option_value_len= 0;
}
/* should be empty */
get_word(&text, &word_len, NONSPACE);
if (word_len)
goto syntax_error;
if (skip)
command= new Unset_option(map, instance_name, instance_name_len,
option, option_len, option_value,
option_value_len);
else
command= new Set_option(map, instance_name, instance_name_len,
option, option_len, option_value,
option_value_len);
break;
case TOK_SHOW:
switch (shift_token(&text, &word_len)) {
case TOK_INSTANCES:
get_word(&text, &word_len, NONSPACE);
if (word_len)
goto syntax_error;
command= new Show_instances(map);
break;
case TOK_INSTANCE:
switch (Token tok2= shift_token(&text, &word_len)) {
case TOK_OPTIONS:
case TOK_STATUS:
if (get_text_id(&text, &instance_name_len, &instance_name))
goto syntax_error;
text+= instance_name_len;
/* check that this is the end of the command */
get_word(&text, &word_len, NONSPACE);
if (word_len)
goto syntax_error;
if (tok2 == TOK_STATUS)
command= new Show_instance_status(map, instance_name,
instance_name_len);
else
command= new Show_instance_options(map, instance_name,
instance_name_len);
break;
default:
goto syntax_error;
}
break;
default:
instance_name= text - word_len;
instance_name_len= word_len;
if (instance_name_len)
{
Log_type log_type;
switch (shift_token(&text, &word_len)) {
case TOK_LOG:
switch (Token tok3= shift_token(&text, &word_len)) {
case TOK_FILES:
get_word(&text, &word_len, NONSPACE);
/* check that this is the end of the command */
if (word_len)
goto syntax_error;
command= new Show_instance_log_files(map, instance_name,
instance_name_len);
break;
case TOK_ERROR:
case TOK_GENERAL:
case TOK_SLOW:
/* define a log type */
switch (tok3) {
case TOK_ERROR:
log_type= IM_LOG_ERROR;
break;
case TOK_GENERAL:
log_type= IM_LOG_GENERAL;
break;
case TOK_SLOW:
log_type= IM_LOG_SLOW;
break;
default:
goto syntax_error;
}
/* get the size of the log we want to retrieve */
if (get_text_id(&text, &word_len, &log_size))
goto syntax_error;
text+= word_len;
/* this parameter is required */
if (!word_len)
goto syntax_error;
/* the next token should be comma, or nothing */
get_word(&text, &word_len);
switch (*text) {
case ',':
text++; /* swallow the comma */
/* read the next word */
get_word(&text, &word_len);
if (!word_len)
goto syntax_error;
text+= word_len;
command= new Show_instance_log(map, instance_name,
instance_name_len, log_type,
log_size, text);
get_word(&text, &word_len, NONSPACE);
/* check that this is the end of the command */
if (word_len)
goto syntax_error;
break;
case '\0':
command= new Show_instance_log(map, instance_name,
instance_name_len, log_type,
log_size, NULL);
break; /* this is ok */
default:
goto syntax_error;
}
break;
default:
goto syntax_error;
}
break;
default:
goto syntax_error;
}
}
else
goto syntax_error;
break;
}
break;
default:
syntax_error:
command= new Syntax_error();
}
return command;
}
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