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parser.c
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parser.c
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#include "parser.h"
void new_parser_info(parser_info *pinfo)
{
pinfo->state = ST_START;
new_lexer_info(&(pinfo->linfo));
pinfo->cur_lex = NULL;
/* pinfo->tmp_cmd is undefined. */
pinfo->request_for_lex = 1;
pinfo->cur_lex_data_used = 0;
}
void put_new_data_to_parser(parser_info *pinfo,
char *read_buffer, int read_available)
{
put_new_data_to_lexer(&(pinfo->linfo),
read_buffer, read_available);
}
/* Returns:
* 1, if new lex has been got;
* 0, otherwise. */
int parser_get_lex(parser_info *pinfo)
{
if (pinfo->cur_lex != NULL)
destroy_lex(pinfo->cur_lex, ! pinfo->cur_lex_data_used);
pinfo->cur_lex_data_used = 0;
pinfo->cur_lex = get_lex(&(pinfo->linfo));
if (pinfo->cur_lex == NULL) {
return 0; /* Request for new data */
}
return 1;
}
/* Make new command from pinfo->tmp_cmd. */
command *new_cmd(parser_info *pinfo)
{
command *cmd = (command *) malloc(sizeof(command));
cmd->type = pinfo->tmp_cmd.type;
cmd->value = pinfo->tmp_cmd.value;
cmd->value2 = pinfo->tmp_cmd.value2;
return cmd;
}
command *p_st_start(parser_info *pinfo)
{
switch (pinfo->cur_lex->type) {
case LEX_WORD:
pinfo->state = P_ST_EXPECT_CMD_NAME;
break;
case LEX_NUMBER:
case LEX_WRONG_NUMBER:
pinfo->state = P_ST_WRONG;
break;
case LEX_EOLN:
pinfo->state = P_ST_EMPTY;
break;
case LEX_PROTOCOL_PARSE_ERROR:
pinfo->state = P_ST_PROTOCOL_PARSE_ERROR;
break;
}
return NULL;
}
command *p_st_process_arg1(parser_info *pinfo)
{
switch (pinfo->tmp_cmd.type) {
/* Commands without arguments. */
case CMD_TURN:
case CMD_JOIN:
pinfo->state = P_ST_EXPECT_EOLN;
break;
/* Commands with optional str argument. */
case CMD_HELP:
case CMD_NICK:
case CMD_STATUS:
pinfo->state = P_ST_EXPECT_OPTIONAL_STR;
break;
/* Commands with one numerical argument. */
case CMD_BUILD:
case CMD_MAKE:
pinfo->state = P_ST_EXPECT_ONE_NUMBER;
break;
/* Commands with two numerical arguments. */
case CMD_BUY:
case CMD_SELL:
pinfo->state = P_ST_EXPECT_TWO_NUMBERS;
break;
/* Not possible. */
default:
#ifndef DAEMON
fprintf(stderr, "Parser: error in line %d", __LINE__);
#endif
break; /* For avoid compile error with defined DAEMON macro. */
}
return NULL;
}
command *p_st_process_arg2(parser_info *pinfo)
{
switch (pinfo->tmp_cmd.type) {
/* Commands with optional str argument.
* We already process one argument. */
case CMD_HELP:
case CMD_NICK:
case CMD_STATUS:
/* Commands with one numerical argument. */
case CMD_BUILD:
case CMD_MAKE:
pinfo->state = P_ST_EXPECT_EOLN;
break;
/* Commands with two numerical arguments. */
case CMD_BUY:
case CMD_SELL:
pinfo->state = P_ST_EXPECT_ONE_NUMBER;
break;
/* Not possible. */
default:
#ifndef DAEMON
fprintf(stderr, "Parser: error in line %d", __LINE__);
#endif
break; /* For avoid compile error with defined DAEMON macro. */
}
return NULL;
}
command *p_st_expect_cmd_name(parser_info *pinfo)
{
pinfo->request_for_lex = 1;
pinfo->state = P_ST_PROCESS_ARG1;
pinfo->tmp_cmd.type = get_cmd_type(pinfo->cur_lex->value.str);
if (pinfo->tmp_cmd.type == CMD_WRONG) {
pinfo->request_for_lex = 0;
pinfo->state = P_ST_WRONG;
}
return NULL;
}
command *p_st_expect_eoln(parser_info *pinfo)
{
command *cmd = NULL;
switch (pinfo->cur_lex->type) {
case LEX_EOLN:
pinfo->state = P_ST_START;
pinfo->request_for_lex = 1;
/* pinfo->tmp_cmd already defined
* (only type or both type and value). */
cmd = new_cmd(pinfo);
break;
case LEX_PROTOCOL_PARSE_ERROR:
pinfo->state = P_ST_PROTOCOL_PARSE_ERROR;
break;
default:
pinfo->state = P_ST_WRONG;
}
return cmd;
}
command *p_st_expect_optional_str(parser_info *pinfo)
{
command *cmd = NULL;
switch (pinfo->cur_lex->type) {
case LEX_WORD:
pinfo->tmp_cmd.value = pinfo->cur_lex->value;
pinfo->cur_lex_data_used = 1;
pinfo->request_for_lex = 1;
pinfo->state = P_ST_PROCESS_ARG2;
break;
case LEX_EOLN:
pinfo->request_for_lex = 1;
pinfo->state = P_ST_START;
/* pinfo->tmp_cmd.type already defined. */
pinfo->tmp_cmd.value.str = NULL;
cmd = new_cmd(pinfo);
break;
case LEX_PROTOCOL_PARSE_ERROR:
pinfo->state = P_ST_PROTOCOL_PARSE_ERROR;
break;
default:
pinfo->state = P_ST_WRONG;
}
return cmd;
}
command *p_st_expect_two_numbers(parser_info *pinfo)
{
switch (pinfo->cur_lex->type) {
case LEX_NUMBER:
pinfo->tmp_cmd.value = pinfo->cur_lex->value;
pinfo->request_for_lex = 1;
pinfo->state = P_ST_PROCESS_ARG2;
break;
case LEX_PROTOCOL_PARSE_ERROR:
pinfo->state = P_ST_PROTOCOL_PARSE_ERROR;
break;
case LEX_WORD:
case LEX_EOLN:
default:
pinfo->state = P_ST_WRONG;
}
return NULL;
}
command *p_st_expect_one_number(parser_info *pinfo)
{
switch (pinfo->cur_lex->type) {
case LEX_NUMBER:
switch (pinfo->tmp_cmd.type) {
case CMD_BUILD:
case CMD_MAKE:
pinfo->tmp_cmd.value = pinfo->cur_lex->value;
break;
case CMD_BUY:
case CMD_SELL:
pinfo->tmp_cmd.value2 = pinfo->cur_lex->value;
break;
default:
/* Not possible. */
#ifndef DAEMON
fprintf(stderr, "Parser: error in line %d", __LINE__);
#endif
return NULL;
}
pinfo->request_for_lex = 1;
pinfo->state = P_ST_EXPECT_EOLN;
break;
case LEX_PROTOCOL_PARSE_ERROR:
pinfo->state = P_ST_PROTOCOL_PARSE_ERROR;
break;
case LEX_WORD:
case LEX_EOLN:
default:
pinfo->state = P_ST_WRONG;
}
return NULL;
}
command *p_st_wrong(parser_info *pinfo)
{
pinfo->state = P_ST_SKIP;
pinfo->tmp_cmd.type = CMD_WRONG;
return new_cmd(pinfo);
}
command *p_st_empty(parser_info *pinfo)
{
pinfo->request_for_lex = 1;
pinfo->state = P_ST_START;
pinfo->tmp_cmd.type = CMD_EMPTY;
return new_cmd(pinfo);
}
command *p_st_skip(parser_info *pinfo)
{
switch (pinfo->cur_lex->type) {
case LEX_WORD:
case LEX_NUMBER:
case LEX_WRONG_NUMBER:
pinfo->request_for_lex = 1;
break;
case LEX_EOLN:
pinfo->request_for_lex = 1;
pinfo->state = P_ST_START;
break;
case LEX_PROTOCOL_PARSE_ERROR:
pinfo->state = P_ST_PROTOCOL_PARSE_ERROR;
break;
}
return NULL;
}
command *p_st_protocol_parse_error(parser_info *pinfo)
{
pinfo->tmp_cmd.type = CMD_PROTOCOL_PARSE_ERROR;
return new_cmd(pinfo);
}
command *get_cmd(parser_info *pinfo)
{
command *cmd = NULL;
do {
if (pinfo->request_for_lex) {
if (parser_get_lex(pinfo)) {
pinfo->request_for_lex = 0;
} else {
return NULL; /* Request for new data */
}
}
switch (pinfo->state) {
case P_ST_START:
cmd = p_st_start(pinfo);
break;
case P_ST_PROCESS_ARG1:
cmd = p_st_process_arg1(pinfo);
break;
case P_ST_PROCESS_ARG2:
cmd = p_st_process_arg2(pinfo);
break;
case P_ST_EXPECT_CMD_NAME:
cmd = p_st_expect_cmd_name(pinfo);
break;
case P_ST_EXPECT_EOLN:
cmd = p_st_expect_eoln(pinfo);
break;
case P_ST_EXPECT_OPTIONAL_STR:
cmd = p_st_expect_optional_str(pinfo);
break;
case P_ST_EXPECT_TWO_NUMBERS:
cmd = p_st_expect_two_numbers(pinfo);
break;
case P_ST_EXPECT_ONE_NUMBER:
cmd = p_st_expect_one_number(pinfo);
break;
case P_ST_WRONG:
cmd = p_st_wrong(pinfo);
break;
case P_ST_EMPTY:
cmd = p_st_empty(pinfo);
break;
case P_ST_SKIP:
cmd = p_st_skip(pinfo);
break;
case P_ST_PROTOCOL_PARSE_ERROR:
cmd = p_st_protocol_parse_error(pinfo);
break;
} /* switch */
} while (cmd == NULL);
return cmd;
}
void destroy_cmd(command *cmd, int destroy_str)
{
if (!destroy_str) {
free(cmd);
return;
}
switch (cmd->type) {
case CMD_HELP:
case CMD_NICK:
case CMD_STATUS:
if (cmd->value.str != NULL)
free(cmd->value.str);
break;
default:
break; /* For avoid compile error. */
}
free(cmd);
}