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#include "./include/lexer.h"
#include "./include/macros.h"
#include "./include/token.h"
#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void lexer_reset(lexer_t *lexer, char *source) {
lexer->source = source;
lexer->c = source[0];
lexer->i = 0;
lexer->row = 1;
lexer->col = 1;
lexer->finished = false;
}
lexer_t *init_lexer(char *source) {
lexer_t *l = (lexer_t *)malloc(sizeof(lexer_t));
if (l == NULL)
die("malloc on lexer");
lexer_reset(l, source);
return l;
}
void lexer_move(lexer_t *lexer) {
if (lexer->c != '\0') {
lexer->i++;
lexer->c = lexer->source[lexer->i];
if (lexer->c == '\n') {
lexer->row++;
lexer->col = 0;
}
} else
lexer->finished = true;
}
void lexer_ignore_whitespace(lexer_t *lexer) {
while (isspace(lexer->c)) {
if (lexer->c == '\0')
return;
lexer_move(lexer);
}
}
void lexer_skip_comment(lexer_t *lexer) {
while (lexer->c != '\n' && lexer->c != '\0')
lexer_move(lexer);
}
static bool is_valid_id_char(char c) {
if (c == '(' || c == ')' || isdigit(c) || c == '"' || c == '\'' || c == '#' ||
c == '.' || isspace(c))
return false;
return true;
}
static char *char_to_string(char c) {
char *s = (char *)malloc(2 * sizeof(char));
s[0] = c;
s[1] = '\0';
return s;
}
token_t *lexer_collect_bool(lexer_t *lexer) {
lexer_move(lexer);
if (lexer->c == 't') {
lexer_move(lexer);
return init_token(TOKEN_BOOL, "T", lexer->row, lexer->col);
} else if (lexer->c == 'f') {
lexer_move(lexer);
return init_token(TOKEN_BOOL, "F", lexer->row, lexer->col);
} else
return NULL;
}
token_t *lexer_collect_id(lexer_t *lexer) {
char *ret = (char *)malloc(1);
ret[0] = '\0';
while (is_valid_id_char(lexer->c)) {
ret = realloc(ret, (strlen(ret) + 2));
strcat(ret, char_to_string(lexer->c));
lexer_move(lexer);
}
return init_token(TOKEN_ID, ret, lexer->row, lexer->col);
}
token_t *lexer_collect_num(lexer_t *lexer) {
char *ret = (char *)malloc(1);
ret[0] = '\0';
bool is_float = false;
while (isdigit(lexer->c) || (lexer->c == '.' && !is_float)) {
if (lexer->c == '.')
is_float = true;
ret = realloc(ret, (strlen(ret) + 2));
strcat(ret, char_to_string(lexer->c));
lexer_move(lexer);
}
if (is_float)
return init_token(TOKEN_FLOAT, ret, lexer->row, lexer->col);
return init_token(TOKEN_INT, ret, lexer->row, lexer->col);
}
token_t *lexer_collect_string(lexer_t *lexer) {
char *ret = (char *)malloc(1);
ret[0] = '\0';
lexer_move(lexer);
while (lexer->c != '"') {
ret = realloc(ret, (strlen(ret) + 2));
strcat(ret, char_to_string(lexer->c));
lexer_move(lexer);
}
lexer_move(lexer);
return init_token(TOKEN_STRING, ret, lexer->row, lexer->col);
}
static token_t *lexer_move_with(lexer_t *lexer, token_t *token) {
lexer_move(lexer);
return token;
}
token_t *lexer_collect_next(lexer_t *lexer) {
if (lexer->c == '\0' || lexer->c == EOF) {
lexer->finished = true;
return NULL;
}
if (isspace(lexer->c)) {
lexer_ignore_whitespace(lexer);
}
if (lexer->c == '\0' || lexer->c == EOF) {
lexer->finished = true;
return NULL;
}
if (isdigit(lexer->c))
return lexer_collect_num(lexer);
else if (is_valid_id_char(lexer->c))
return lexer_collect_id(lexer);
else if (lexer->c == '"')
return lexer_collect_string(lexer);
else if (lexer->c == '#')
return lexer_collect_bool(lexer);
else if (lexer->c == '(')
return lexer_move_with(
lexer, init_token(TOKEN_LPAREN, "(", lexer->row, lexer->col));
else if (lexer->c == ')')
return lexer_move_with(
lexer, init_token(TOKEN_RPAREN, ")", lexer->row, lexer->col));
else if (lexer->c == '\'')
return lexer_move_with(
lexer, init_token(TOKEN_QUOTE, "'", lexer->row, lexer->col));
else if (lexer->c == '.')
return lexer_move_with(
lexer, init_token(TOKEN_PERIOD, ".", lexer->row, lexer->col));
else {
printf("returns null\n");
return NULL;
}
}
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