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|
extern strlen = (*i8) => i64;
extern memcpy = (*void, *void, i64) => void;
extern sprintf = (*i8, *i8, varargs) => void;
extern atoi = (*i8) => i64;
extern fopen = (*i8, *i8) => *i8;
extern fgets = (*i8, i64, *i8) => void;
extern feof = (*i8) => bool;
extern fseek = (*i8, i64, i64) => i64;
extern ftell = (*i8) => i64;
extern fread = (*i8, i64, i64, *i8) => i64;
extern fclose = (*i8) => *i8;
import "!stdlib.src";
import "!mem.src";
let tokenizer = struct {
tokens: *i8,
tokens_len: i64,
buf: *i8,
file_size: i64,
offset: i64,
arena: *arena,
};
let read_file = (t: *tokenizer, filename: *i8) => void {
let file = fopen(filename, "r");
fseek(file, 0, 2);
(*t).file_size = ftell(file);
fseek(file, 0, 0);
let buf = cast(*i8, arena_alloc((*t).arena, (*t).file_size + 1));
let bytes_read = fread(buf, 1, (*t).file_size, file);
(*(buf + cast(*i8, bytes_read))) = '\0';
fclose(file);
(*t).buf = buf;
return;
};
let add_token = (t: *tokenizer, token: *i8) => i64 {
println("Add token: %s", token);
let i = 0;
while true {
let c = (*(token + cast(*i8, i)));
(*((*t).tokens + cast(*i8, (*t).tokens_len))) = c;
(*t).tokens_len = (*t).tokens_len + 1;
i = i + 1;
if c == '\0' {
return 0;
};
};
return 0;
};
let print_tokens = (t: *tokenizer) => i64 {
let i = 0;
while i < (*t).tokens_len {
let c = (*((*t).tokens + cast(*i8, i)));
if c == '\0' {
c = '\n';
};
printf("%c", c);
i = i + 1;
};
return 0;
};
let tokenizer_skip_whitespace = (t: *tokenizer) => void {
while true {
if (*t).offset >= (*t).file_size { return; };
let c = (*((*t).buf + cast(*i8, (*t).offset)));
if !iswhitespace(c) {
return;
};
(*t).offset = (*t).offset + 1;
};
return;
};
let tokenizer_accept_string = (t: *tokenizer, str: *i8) => bool {
let str_len = strlen(str);
if (*t).offset + str_len > (*t).file_size { return false; };
let s = cast(*i8, arena_alloc((*t).arena, 1000));
memcpy(cast(*void, s), cast(*void, (*t).buf + cast(*i8, (*t).offset)), str_len);
if strcmp(s, str) {
(*t).offset = (*t).offset + str_len;
return true;
};
return false;
};
let tokenizer_consume_until_condition = (t: *tokenizer, condition: (i8) => bool) => *i8 {
let start = (*t).offset;
let res = cast(*i8, arena_alloc((*t).arena, 1000));
while true {
if (*t).offset >= (*t).file_size {
return res;
};
let c = (*((*t).buf + cast(*i8, (*t).offset)));
let offset = (*t).offset;
if c == '\\' {
let next_c = (*((*t).buf + cast(*i8, offset + 1)));
let any = false;
if next_c == 'n' {
(*(res + cast(*i8, offset - start))) = '\n';
any = true;
};
if next_c == 't' {
(*(res + cast(*i8, offset - start))) = '\t';
any = true;
};
if next_c == 'r' {
(*(res + cast(*i8, offset - start))) = '\r';
any = true;
};
if next_c == '0' {
(*(res + cast(*i8, offset - start))) = '\0';
any = true;
};
if next_c == '\\' {
(*(res + cast(*i8, offset - start))) = '\\';
any = true;
};
if !any {
(*(res + cast(*i8, offset - start))) = next_c;
};
offset = offset + 1;
offset = offset + 1;
(*t).offset = offset;
continue;
};
if condition(c) {
return res;
};
(*(res + cast(*i8, offset - start))) = c;
(*(res + cast(*i8, offset - start + 1))) = '\0';
offset = offset + 1;
(*t).offset = offset;
};
return cast(*i8, null);
};
let tokenizer_accept_int_type = (t: *tokenizer) => *i64 {
let string = tokenizer_consume_until_condition(t, (c: i8) => bool {
return !isdigit(c);
});
if string == cast(*i8, null) {
return cast(*i64, null);
};
if strlen(string) == 0 {
return cast(*i64, null);
};
let x = cast(*i64, arena_alloc((*t).arena, 8));
*x = atoi(string);
return x;
};
let tokenizer_accept_char_type = (t: *tokenizer) => *i8 {
let prev_offset = (*t).offset;
if !tokenizer_accept_string(t, "'") {
(*t).offset = prev_offset;
return cast(*i8, null);
};
let string = tokenizer_consume_until_condition(t, (c: i8) => bool {
return c == '\'';
});
if !tokenizer_accept_string(t, "'") {
(*t).offset = prev_offset;
return cast(*i8, null);
};
return string;
};
let tokenizer_accept_string_type = (t: *tokenizer) => *i8 {
let prev_offset = (*t).offset;
if !tokenizer_accept_string(t, "\"") {
(*t).offset = prev_offset;
return cast(*i8, null);
};
let string = tokenizer_consume_until_condition(t, (c: i8) => bool {
return c == '"';
});
if !tokenizer_accept_string(t, "\"") {
(*t).offset = prev_offset;
return cast(*i8, null);
};
return string;
};
let tokenizer_skip_comments = (t: *tokenizer) => void {
if !tokenizer_accept_string(t, "/*") { return; };
while !tokenizer_accept_string(t, "*/") {
(*t).offset = (*t).offset + 1;
};
return;
};
let tokenizer_next = (t: *tokenizer) => *i8 {
tokenizer_skip_whitespace(t);
tokenizer_skip_comments(t);
tokenizer_skip_whitespace(t);
if (*t).offset >= (*t).file_size {
return "EOF";
};
if tokenizer_accept_string(t, "import") {
return "import";
};
if tokenizer_accept_string(t, "let") {
return "let";
};
if tokenizer_accept_string(t, "extern") {
return "extern";
};
if tokenizer_accept_string(t, "if") {
return "if";
};
if tokenizer_accept_string(t, "while") {
return "while";
};
if tokenizer_accept_string(t, "return") {
return "return";
};
if tokenizer_accept_string(t, "break") {
return "break";
};
if tokenizer_accept_string(t, "true") {
return "bool:true";
};
if tokenizer_accept_string(t, "false") {
return "bool:false";
};
if tokenizer_accept_string(t, "=>") {
return "=>";
};
if tokenizer_accept_string(t, ";") {
return ";";
};
if tokenizer_accept_string(t, ",") {
return ",";
};
if tokenizer_accept_string(t, ":") {
return ":";
};
if tokenizer_accept_string(t, "(") {
return "(";
};
if tokenizer_accept_string(t, ")") {
return ")";
};
if tokenizer_accept_string(t, "{") {
return "{";
};
if tokenizer_accept_string(t, "}") {
return "}";
};
if tokenizer_accept_string(t, "=") {
return "=";
};
if tokenizer_accept_string(t, "+") {
return "+";
};
if tokenizer_accept_string(t, "-") {
return "-";
};
if tokenizer_accept_string(t, "*") {
return "*";
};
if tokenizer_accept_string(t, "/") {
return "/";
};
if tokenizer_accept_string(t, "%") {
return "%";
};
if tokenizer_accept_string(t, "!") {
return "!";
};
if tokenizer_accept_string(t, "<") {
return "<";
};
if tokenizer_accept_string(t, ">") {
return ">";
};
if tokenizer_accept_string(t, ".") {
return ".";
};
let maybe_int = tokenizer_accept_int_type(t);
if maybe_int != cast(*i64, null) {
let to = cast(*i8, arena_alloc((*t).arena, 1000));
sprintf(to, "int:%d", *maybe_int);
return to;
};
let maybe_char = tokenizer_accept_char_type(t);
if maybe_char != cast(*i8, null) {
let to = cast(*i8, arena_alloc((*t).arena, 1000));
sprintf(to, "char:%d", *maybe_char);
return to;
};
let maybe_string = tokenizer_accept_string_type(t);
if maybe_string != cast(*i8, null) {
let to = cast(*i8, arena_alloc((*t).arena, 1000));
sprintf(to, "string:%s", maybe_string);
return to;
};
let string = tokenizer_consume_until_condition(t, (c: i8) => bool {
if isalphanum(c) {
return false;
};
if c == '_' {
return false;
};
return true;
});
if strlen(string) == 0 {
return cast(*i8, null);
};
let to = cast(*i8, arena_alloc((*t).arena, 100));
sprintf(to, "identifier:%s", string);
return to;
};
let tokenizer_init = (alloc: *arena, filename: *i8) => i64 {
let t = cast(*tokenizer, arena_alloc(alloc, sizeof(tokenizer)));
(*t).arena = alloc;
(*t).tokens = cast(*i8, arena_alloc((*t).arena, 100000));
read_file(t, filename);
println("File size: %d", (*t).file_size);
println("%s", (*t).buf);
while true {
let tk = tokenizer_next(t);
if tk == cast(*i8, null) {
println("NULL TOKEN!");
return 1;
};
if strcmp(tk, "EOF") {
break;
};
add_token(t, tk);
};
println("PRINT TOKENS");
print_tokens(t);
return 0;
};
let tokenizer_deinit = () => i64 {
return 0;
};
|
