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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include "include/lexer.h"
lexer_t* lexer_init(char* content) {
lexer_t* lexer = calloc(1, sizeof(struct LEXER_STRUC));
lexer->content = content;
lexer->i = 0;
lexer->c = content[lexer->i];
return lexer;
}
void lexer_destroy(lexer_t* lexer) {
free(lexer);
}
void lexer_next(lexer_t* lexer) {
if (LEXER_VALID) {
lexer->i ++;
lexer->c = lexer->content[lexer->i];
}
}
void lexer_pass(lexer_t* lexer) {
while (char_can_ignore(&lexer->c)) {
lexer_next(lexer);
}
}
token_t* lexer_get_next_token(lexer_t* lexer) {
while (LEXER_VALID) {
if (char_can_ignore(&lexer->c)) { lexer_pass(lexer); }
if (char_could_start_int(&lexer->c)) { return lexer_next_token(lexer, TOKEN_PRIM_INT); }
if (char_could_start_keyword(&lexer->c)) { return lexer_collect(lexer, token_char_kywrd, 0, 0, TOKEN_KEYWORD); }
switch (lexer->c) {
case SYNTAX_STR_DELIM:
return lexer_collect(lexer, token_char_quote, 1, 1, TOKEN_PRIM_STR);
break;
case SYNTAX_EXPR_END:
return lexer_next_token(lexer, TOKEN_STMNT_END);
break;
case SYNTAX_SET:
return lexer_next_token(lexer, TOKEN_DEF_SET);
break;
case SYNTAX_LGROUP:
return lexer_next_token(lexer, TOKEN_LGROUP);
break;
case SYNTAX_RGROUP:
return lexer_next_token(lexer, TOKEN_RGROUP);
break;
case SYNTAX_APPLY:
return lexer_next_token(lexer, TOKEN_FN_APPLY);
break;
case SYNTAX_LIST_DELIM:
return lexer_next_token(lexer, TOKEN_LIST_DELIM);
break;
case SYNTAX_TAG_DELIM:
return lexer_collect(lexer, token_char_kywrd, 1, 0, TOKEN_DEF_TAG);
break;
case SYNTAX_NAMESPACE_DELIM:
return lexer_next_token(lexer, TOKEN_NAMESPACE_DELIM);
break;
case SYNTAX_LBLOCK:
return lexer_next_token(lexer, TOKEN_BLOCK_START);
break;
case SYNTAX_RBLOCK:
return lexer_next_token(lexer, TOKEN_BLOCK_END);
break;
case SYNTAX_LLIST:
return lexer_next_token(lexer, TOKEN_ARRAY_START);
break;
case SYNTAX_RLIST:
return lexer_next_token(lexer, TOKEN_ARRAY_END);
break;
case '\0':
case EOF:
return token_init(TOKEN_EOF, lexer_get_c_as_string(lexer));
break;
default:
return lexer_next_token(lexer, TOKEN_UNKNOWN);
break;
}
}
return NULL;
}
token_t* lexer_next_token(lexer_t* lexer, int token_type) {
token_t* token = token_init(token_type, lexer_get_c_as_string(lexer));
lexer_next(lexer);
return token;
}
char* lexer_get_c_as_string(lexer_t* lexer) {
char* str; /* the string to return */
str = malloc(2);
str[0] = lexer->c;
str[1] = '\0';
return str;
}
token_t* lexer_collect(lexer_t* lexer, int (*end_char)(char), int fskip, int lskip, int type) {
size_t len; /* length of collected token so far */
char* token; /* collected token so far */
len = 0;
token = calloc(len, sizeof(char));
if (fskip) { lexer_next(lexer); }
while (end_char(lexer->c)) {
char* current;
current = lexer_get_c_as_string(lexer);
token = realloc(
token,
(len + sizeof(current))
);
memcpy(token + len, current, sizeof(char) * strlen(current));
len += strlen(current) * sizeof(char);
lexer_next(lexer);
free(current);
}
if (lskip) { lexer_next(lexer); }
token[len] = '\0'; /* terminate */
return token_init(type, token);
}
lexer_t* lexer_run(lexer_t* lexer) {
while (1) {
token_t* token;
char* type;
token = lexer_get_next_token(lexer);
type = token_get_type(token->type);
log_inf("type: %s\t\tval:%s", type, token->value);
if (token->type == TOKEN_EOF) {
token_destroy(token);
break;
}
token_destroy(token);
}
return lexer;
}
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