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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include "include/lexer.h"
#include "include/syntax.h"
#include "include/token.h"
lexer_t* lexer_init(char* src) {
lexer_t* lexer;
lexer = emalloc(sizeof(struct LEXER_STRUC));
lexer->src = src;
lexer->state = LEXER_STATE_REG;
lexer->tokenl = NULL;
lexer->tokenl_last = NULL;
lexer->tokenc = 0;
return lexer;
}
void lexer_destroy(lexer_t* lexer) {
free(lexer);
}
void lexer_add_token(lexer_t* lexer, token_t* token) {
token_t* t;
if (lexer->tokenl) {
lexer->tokenl_last->nxt = token;
lexer->tokenl_last = token;
} else {
lexer->tokenl = token;
lexer->tokenl_last = token;
}
lexer->tokenc ++;
}
void lexer_add_current_char(lexer_t* lexer, int type) {
token_t* t; /* the token to be added */
t = token_init(type, *lexer->src);
lexer_add_token(lexer, t);
}
void lexer_add_current_char_to_last_token(lexer_t* lexer, int type) {
if (lexer->tokenl_last && lexer->tokenl_last->type == type) {
token_add_char(lexer->tokenl_last, *lexer->src);
} else {
lexer_add_current_char(lexer, type);
}
}
void lexer_do_reg(lexer_t* lexer) {
switch (*lexer->src) {
case SYNTAX_APPLY:
lexer_add_current_char(lexer, TOKEN_APPLY);
break;
case SYNTAX_TAG_DELIM:
lexer->state = LEXER_STATE_TAG;
break;
case SYNTAX_NAMESPACE_DELIM:
lexer_add_current_char(lexer, TOKEN_NAMESPACE_DELIM);
break;
case SYNTAX_SET:
lexer_add_current_char(lexer, TOKEN_SET);
break;
case SYNTAX_LLIST:
lexer_add_current_char(lexer, TOKEN_LLIST);
break;
case SYNTAX_RLIST:
lexer_add_current_char(lexer, TOKEN_RLIST);
break;
case SYNTAX_LGROUP:
lexer_add_current_char(lexer, TOKEN_LGROUP);
break;
case SYNTAX_RGROUP:
lexer_add_current_char(lexer, TOKEN_RGROUP);
break;
case SYNTAX_EXPR_END:
lexer_add_current_char(lexer, TOKEN_EXPR_END);
break;
case SYNTAX_LIST_DELIM:
lexer_add_current_char(lexer, TOKEN_LIST_DELIM);
break;
case SYNTAX_STR_DELIM:
lexer->state = LEXER_STATE_STR;
break;
default:
lexer_add_current_char(lexer, TOKEN_UNKNOWN);
}
}
void lexer_do_tag(lexer_t* lexer) {
switch (*lexer->src) {
case SYNTAX_SET:
lexer_add_current_char(lexer, TOKEN_SET);
lexer->state = LEXER_STATE_REG;
break;
case SYNTAX_APPLY:
lexer_add_current_char(lexer, TOKEN_APPLY);
lexer->state = LEXER_STATE_REG;
break;
case SYNTAX_TAG_DELIM:
lexer_add_token(lexer, token_init(TOKEN_TAG, '\0'));
break;
default: lexer_add_current_char_to_last_token(lexer, TOKEN_TAG);
}
}
void lexer_do_str(lexer_t* lexer) {
if (*lexer->src == SYNTAX_STR_DELIM) {
lexer->state = LEXER_STATE_REG;
} else {
lexer_add_current_char_to_last_token(lexer, TOKEN_STR);
}
}
void lexer_run(lexer_t* lexer) {
while (*lexer->src) {
if (lexer->state == LEXER_STATE_REG) { lexer_do_reg(lexer); }
else if (lexer->state == LEXER_STATE_TAG) { lexer_do_tag(lexer); }
else if (lexer->state == LEXER_STATE_STR) { lexer_do_str(lexer); }
lexer->src ++;
}
token_print(lexer->tokenl);
}
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