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#include "include/lexer.h"
#include "include/token.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.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_next(lexer_t* lexer) {
// if not at end of line or file
if (lexer->c != '\0' && lexer->i < strlen(lexer->content)) {
lexer->i += 1; // advance index 1 character
lexer->c = lexer->content[lexer->i]; // set character w/ index
}
}
void lexer_pass(lexer_t* lexer) {
while (lexer->c == ' ' ||
lexer->c == '\t' ||
lexer->c == '\n') {
lexer_next(lexer);
}
}
token_t* lexer_get_next_token(lexer_t* lexer) {
while (lexer->c != '\0' && lexer->i < strlen(lexer->content)) {
if (lexer->c == ' ' ||
lexer->c == '\t' ||
lexer->c == '\n') {
lexer_pass(lexer);
}
if (isalnum(lexer->c))
return lexer_get_id(lexer);
switch (lexer->c) {
case '"': return lexer_get_string(lexer); break;
case '=': return lexer_next_token(
lexer,
token_init(
TOKEN_EQ,
lexer_get_c_as_string(lexer)
)
); break;
case '/': return lexer_next_token(
lexer,
token_init(
TOKEN_LORD,
lexer_get_c_as_string(lexer)
)
); break;
case '\\': return lexer_next_token(
lexer,
token_init(
TOKEN_RORD,
lexer_get_c_as_string(lexer)
)
); break;
case '&': return lexer_next_token(
lexer,
token_init(
TOKEN_AMP,
lexer_get_c_as_string(lexer)
)
); break;
case '[': return lexer_get_comment(lexer); break;
case ']': lexer_next(lexer); break;
case '#': return lexer_next_token(
lexer,
token_init(
TOKEN_POUND,
lexer_get_c_as_string(lexer)
)
); break;
case '~': return lexer_next_token(
lexer,
token_init(
TOKEN_TILDE,
lexer_get_c_as_string(lexer)
)
); break;
case ';': return lexer_next_token(
lexer,
token_init(
TOKEN_SEMI,
lexer_get_c_as_string(lexer)
)
); break;
}
}
// return token_init(TOKEN_EOF, "\0");
return NULL;
}
token_t* lexer_get_string(lexer_t* lexer) {
lexer_next(lexer);
char* str_so_far = calloc(1, sizeof(char));
str_so_far[0] = '\0';
while (lexer->c != '"') {
char* current = lexer_get_c_as_string(lexer);
str_so_far = realloc(str_so_far, (strlen(str_so_far) + strlen(current) * sizeof(char))); // give str so far some more memory
strcat(str_so_far, current); // add current to str so far
lexer_next(lexer);
}
lexer_next(lexer);
return token_init(TOKEN_QUOTE, str_so_far);
}
token_t* lexer_get_comment(lexer_t* lexer) {
lexer_next(lexer);
while (lexer->c != ']') {
lexer_next(lexer);
}
lexer_next(lexer);
return token_init(TOKEN_COMM, lexer_get_c_as_string(lexer));
}
token_t* lexer_get_id(lexer_t* lexer) {
char* str_so_far = calloc(1, sizeof(char));
str_so_far[0] = '\0';
while (isalnum(lexer->c)) {
char* current = lexer_get_c_as_string(lexer);
str_so_far = realloc(str_so_far, (strlen(str_so_far) + strlen(current) * sizeof(char)));
strcat(str_so_far, current);
lexer_next(lexer);
}
lexer_next(lexer);
return token_init(TOKEN_ID, str_so_far);
}
token_t* lexer_next_token(lexer_t* lexer, token_t* token) {
lexer_next(lexer);
return token;
}
char* lexer_get_c_as_string(lexer_t* lexer) {
char* str = calloc(2, sizeof(char));
str[0] = lexer->c;
str[1] = '\0';
return str;
}
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