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200
server-tools/instance-manager/parse.cc
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200
server-tools/instance-manager/parse.cc
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/* Copyright (C) 2004 MySQL AB
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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; either version 2 of the License, or
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(at your option) any later version.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "parse.h"
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#include <string.h>
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enum Token
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{
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TOK_FLUSH = 0,
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TOK_INSTANCE,
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TOK_INSTANCES,
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TOK_OPTIONS,
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TOK_START,
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TOK_STATUS,
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TOK_STOP,
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TOK_SHOW,
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TOK_NOT_FOUND, // must be after all tokens
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TOK_END
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};
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static const char *tokens[]= {
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"FLUSH",
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"INSTANCE",
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"INSTANCES",
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"OPTIONS",
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"START",
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"STATUS",
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"STOP",
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"SHOW",
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};
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/*
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tries to find next word in the text
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if found, returns the beginning and puts word length to word_len argument.
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if not found returns pointer to first non-space or to '\0', word_len == 0
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*/
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inline void get_word(const char **text, uint *word_len)
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{
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const char *word_end;
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/* skip space */
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while (my_isspace(default_charset_info, **text))
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++(*text);
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word_end= *text;
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while (my_isalnum(default_charset_info, *word_end))
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++word_end;
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*word_len= word_end - *text;
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}
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/*
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Returns token no if word corresponds to some token, otherwise returns
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TOK_NOT_FOUND
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*/
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inline Token find_token(const char *word, uint word_len)
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{
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int i= 0;
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do
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{
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if (strncasecmp(tokens[i], word, word_len) == 0)
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break;
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}
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while (++i < TOK_NOT_FOUND);
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return (Token) i;
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}
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Token get_token(const char **text, uint *word_len)
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{
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get_word(text, word_len);
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if (*word_len)
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return find_token(*text, *word_len);
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return TOK_END;
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}
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Token shift_token(const char **text, uint *word_len)
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{
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Token save= get_token(text, word_len);
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(*text)+= *word_len;
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return save;
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}
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void print_token(const char *token, uint tok_len)
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{
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for (uint i= 0; i < tok_len; ++i)
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printf("%c", token[i]);
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}
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int get_text_id(const char **text, uint *word_len, const char **id)
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{
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get_word(text, word_len);
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if (word_len == 0)
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return 1;
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*id= *text;
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return 0;
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}
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Command *parse_command(Command_factory *factory, const char *text)
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{
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uint word_len;
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const char *instance_name;
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uint instance_name_len;
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Command *command;
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const char *saved_text= text;
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Token tok1= shift_token(&text, &word_len);
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switch (tok1) {
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case TOK_START: // fallthrough
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case TOK_STOP:
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if (shift_token(&text, &word_len) != TOK_INSTANCE)
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goto syntax_error;
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get_word(&text, &word_len);
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if (word_len == 0)
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goto syntax_error;
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instance_name= text;
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instance_name_len= word_len;
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text+= word_len;
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/* it should be the end of command */
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get_word(&text, &word_len);
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if (word_len)
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goto syntax_error;
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command= (tok1 == TOK_START) ? (Command *)
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factory->new_Start_instance(instance_name, instance_name_len):
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(Command *)
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factory->new_Stop_instance(instance_name, instance_name_len);
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break;
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case TOK_FLUSH:
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if (shift_token(&text, &word_len) != TOK_INSTANCES)
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goto syntax_error;
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get_word(&text, &word_len);
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if (word_len)
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goto syntax_error;
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command= factory->new_Flush_instances();
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break;
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case TOK_SHOW:
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switch (shift_token(&text, &word_len)) {
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case TOK_INSTANCES:
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get_word(&text, &word_len);
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if (word_len)
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goto syntax_error;
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command= factory->new_Show_instances();
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break;
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case TOK_INSTANCE:
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switch (Token tok2= shift_token(&text, &word_len)) {
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case TOK_OPTIONS:
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case TOK_STATUS:
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get_text_id(&text, &instance_name_len, &instance_name);
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text+= instance_name_len;
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get_word(&text, &word_len);
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if (word_len)
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goto syntax_error;
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command= (tok2 == TOK_STATUS) ? (Command *)
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factory->new_Show_instance_status(instance_name,
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instance_name_len):
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(Command *)
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factory->new_Show_instance_options(instance_name,
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instance_name_len);
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break;
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default:
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goto syntax_error;
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}
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break;
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default:
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goto syntax_error;
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}
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break;
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default:
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syntax_error:
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command= factory->new_Syntax_error();
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}
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return command;
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}
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