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/*
* Copyright (c) 2026, Chloe M.
* Provided under the BSD-3 clause
*/
#include <stdint.h>
#include <errno.h>
#include "cescal/log.h"
#include "cescal/parser.h"
#include "cescal/state.h"
#include "cescal/lexer.h"
/* Symbolic token */
#define symtok(tok) \
"[" tok "]"
/* Quoted token */
#define qtok(tok) \
"'" tok "'"
/* Convert token to string */
#define tokstr1(tt) \
toktab[(tt)]
/* Convert token to string */
#define tokstr(tok) \
toktab[(tok)->type]
/* Unexpected token */
#define utok(tok) \
cc_error("unexpected token %s\n", tokstr(tok));
#define utok1(tok, exp_tt) \
cc_error("unexpected token %s, expected %s\n", tokstr(tok), tokstr1(exp_tt))
static int parser_expect(struct cescal_state *state, struct token *res, tt_t exp);
/*
* Converts numeric tokens into human readable strings
*/
static const char *toktab[] = {
[TT_NONE] = symtok("none"),
[TT_IDENT] = symtok("ident"),
[TT_COMMENT] = symtok("comment"),
[TT_INTLIT] = symtok("number"),
[TT_LPAREN] = qtok("("),
[TT_RPAREN] = qtok(")"),
[TT_COMMA] = qtok(","),
[TT_COLON] = qtok(":"),
[TT_ARROW] = qtok("->"),
[TT_PLUS] = qtok("+"),
[TT_MINUS] = qtok("-"),
[TT_SLASH] = qtok("/"),
[TT_STAR] = qtok("*"),
[TT_EQUALS] = qtok("="),
[TT_DEFINE] = qtok("#define"),
[TT_IFNDEF] = qtok("#ifndef"),
[TT_IFDEF] = qtok("#ifdef"),
[TT_RETURN] = qtok("return"),
[TT_PUB] = qtok("pub"),
[TT_PROC] = qtok("proc"),
[TT_BEGIN] = qtok("begin"),
[TT_END] = qtok("end"),
[TT_U8] = qtok("u8"),
[TT_U16] = qtok("u16"),
[TT_U32] = qtok("u32"),
[TT_U64] = qtok("u64")
};
/*
* Parse a preprocessor define directive
*/
static int
parse_define(struct cescal_state *state, struct token *tok)
{
struct symbol *sym;
int error;
if (state == NULL || tok == NULL) {
return -1;
}
if (parser_expect(state, tok, TT_IDENT) < 0) {
return -1;
}
/* XXX: Should probably be a warning */
if ((sym = symbol_byname(&state->symtab, tok->s)) != NULL) {
cc_error("redefinition of symbol %s\n", tok->s);
return -1;
}
/* Allocate the symbol */
error = symbol_allocate(&state->symtab, tok->s, SYMBOL_NONE, &sym);
if (error < 0) {
cc_error("[internal]: failed to allocate symbol\n");
return -1;
}
return 0;
}
/*
* Push a token to the token buffer in the preprocessing stage
*
* @state: Compiler state
* @tokbuf: Token buffer to push to
* @tok: Token to push
*
* Returns zero on success
*/
static int
preprocessor_push(struct cescal_state *state, struct tokbuf *tokbuf, struct token *tok)
{
if (tokbuf == NULL || tok == NULL) {
return -1;
}
switch (tok->type) {
case TT_IFNDEF:
break;
case TT_IFDEF:
break;
case TT_DEFINE:
if (parse_define(state, tok) < 0) {
return -1;
}
break;
default:
if (tokbuf_push(tokbuf, tok) < 0) {
return -1;
}
}
return 0;
}
static int
parser_nom(struct cescal_state *state, struct token *res)
{
if (state == NULL || res == NULL) {
errno = EINVAL;
return -1;
}
switch (state->pass) {
case 0: /* Pre-processor */
if (lexer_nom(state, res) < 0) {
return -1;
}
if (preprocessor_push(state, &state->tokbuf, res) < 0) {
return -1;
}
break;
case 1: /* Parse */
if (tokbuf_pop(&state->tokbuf, res) < 0) {
return -1;
}
break;
}
return 0;
}
/*
* Assert that the next token is of a specific type
*
* @state: Compiler state
* @res: Token result is written here
* @exp: Token expedcted
*
* Returns zero on success
*/
static int
parser_expect(struct cescal_state *state, struct token *res, tt_t exp)
{
if (state == NULL || res == NULL) {
return -1;
}
if (parser_nom(state, res) < 0) {
cc_error("unexpected end of file\n");
return -1;
}
if (res->type != exp) {
utok1(res, exp);
return -1;
}
return 0;
}
int
parser_parse(struct cescal_state *state)
{
struct token tok;
if (state == NULL) {
errno = EINVAL;
return -1;
}
while (parser_nom(state, &tok) == 0) {
if (state->pass > 0) {
cc_trace("got token %s\n", tokstr(&tok));
}
}
++state->pass;
return 0;
}
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