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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include "include/util.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 += 1;
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 '\'':
return lexer_collect(lexer, token_char_quote, 1, 1, TOKEN_PRIM_STR);
break;
case '`':
return lexer_collect(lexer, token_char_grave, 1, 1, TOKEN_COMM);
break;
case ';':
return lexer_next_token(lexer, TOKEN_EXPR_END);
break;
case '=':
return lexer_next_token(lexer, TOKEN_DEF_SET);
break;
case '(':
return lexer_next_token(lexer, TOKEN_LGROUP);
break;
case ')':
return lexer_next_token(lexer, TOKEN_RGROUP);
break;
case '#':
return lexer_collect(lexer, token_char_pound, 1, 1, TOKEN_DIRECTIVE);
break;
case '.':
return lexer_next_token(lexer, TOKEN_FN_APPLY);
break;
case ',':
return lexer_next_token(lexer, TOKEN_LIST_DELIM);
break;
case ':':
return lexer_collect(lexer, token_char_kywrd, 1, 0, TOKEN_DEF_TAG);
break;
case '/':
return lexer_next_token(lexer, TOKEN_NAMESPACE_DELIM);
break;
case '{':
return lexer_next_token(lexer, TOKEN_BLOCK_START);
break;
case '}':
return lexer_next_token(lexer, TOKEN_BLOCK_END);
break;
case '[':
return lexer_next_token(lexer, TOKEN_ARRAY_START);
break;
case ']':
return lexer_next_token(lexer, TOKEN_ARRAY_END);
break;
case '\0':
return token_init(TOKEN_EOF, lexer_get_c_as_string(lexer));
break;
default:
return token_init(TOKEN_UNKNOWN, lexer_get_c_as_string(lexer));
}
}
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;
}
// get the current character as a string
char* lexer_get_c_as_string(lexer_t* lexer) {
char* str; // the string to return
str = calloc(2, sizeof(char));
str[0] = lexer->c;
str[1] = '\0';
return str;
}
// fskip: skip first char?
// lskip: skip last char?
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 = 1;
token = calloc(len, sizeof(char));
token[0] = '\0';
if (fskip) { lexer_next(lexer); }
while (end_char(lexer->c)) {
char* current;
current = lexer_get_c_as_string(lexer);
token = realloc(
token,
(len + sizeof(char) * strlen(current))
);
memcpy(token + len, current, sizeof(char) * strlen(current));
len += sizeof(char) * strlen(current);
lexer_next(lexer);
free(current);
}
if (lskip) { lexer_next(lexer); }
token[len] = '\0'; // null terminate
return token_init(type, token);
}
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