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/*
* Copyright (C) 2023 Johnny Richard
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ast.h"
#include "lexer.h"
#include "parser.h"
void
parser_init(parser_t *parser, lexer_t *lexer)
{
assert(parser && "parser must be defined");
assert(lexer && "lexer must be defined");
parser->lexer = lexer;
parser->errors_len = 0;
}
static bool
expected_token(token_t *token, parser_t *parser, token_kind_t kind)
{
lexer_next_token(parser->lexer, token);
parser_error_t error;
if (token->kind == TOKEN_EOF) {
error.token = *token;
sprintf(
error.message,
"expected '%s' but got end of file",
token_kind_to_str(kind)
);
parser->errors[parser->errors_len++] = error;
return false;
}
if (token->kind != kind) {
error.token = *token;
sprintf(
error.message,
"expected '%s' but got '%s'",
token_kind_to_str(kind), token_kind_to_str(token->kind)
);
parser->errors[parser->errors_len++] = error;
return false;
}
return true;
}
static bool
drop_expected_token(parser_t *parser, token_kind_t kind)
{
token_t ignored_token;
return expected_token(&ignored_token, parser, kind);
}
static bool
parser_parse_type(type_t *type, parser_t *parser)
{
token_t token;
if(!expected_token(&token, parser, TOKEN_NAME)) return false;
if (string_view_eq(token.value, string_view_from_str("i32"))) {
*type = TYPE_I32;
return true;
}
parser_error_t error;
error.token = token;
sprintf(
error.message,
"type '"SVFMT"' is not defined",
SVARG(&token.value)
);
parser->errors[parser->errors_len++] = error;
return false;
}
bool
parser_parse_return_stmt(parser_t *parser, ast_node_t *node)
{
token_t return_keyword_token;
if (!drop_expected_token(parser, TOKEN_OCURLY)) return false;
if(!expected_token(&return_keyword_token, parser, TOKEN_NAME)) return false;
if (!string_view_eq(return_keyword_token.value, string_view_from_str("return"))) {
parser_error_t error;
error.token = return_keyword_token;
sprintf(
error.message,
"expected 'return' keyword but got '"SVFMT"'",
SVARG(&return_keyword_token.value)
);
parser->errors[parser->errors_len++] = error;
return false;
}
token_t number_token;
if (!expected_token(&number_token, parser, TOKEN_NUMBER)) return false;
if (!drop_expected_token(parser, TOKEN_SEMICOLON)) return false;
if (!drop_expected_token(parser, TOKEN_CCURLY)) return false;
char number_as_str[number_token.value.size];
string_view_to_str(&number_token.value, number_as_str);
ast_node_init_return_stmt(node, atoi(number_as_str));
return true;
}
bool
parser_parse_function_declaration(parser_t *parser, ast_node_t *node)
{
token_t func_name_token;
if (!expected_token(&func_name_token, parser, TOKEN_NAME)) {
return false;
}
if (!drop_expected_token(parser, TOKEN_OPAREN)) return false;
if (!drop_expected_token(parser, TOKEN_CPAREN)) return false;
if (!drop_expected_token(parser, TOKEN_COLON)) return false;
type_t return_type;
if(!parser_parse_type(&return_type, parser)) {
return false;
}
ast_node_t *return_node = ast_node_new();
bool parsed_return = parser_parse_return_stmt(parser, return_node);
if (!parsed_return) {
return false;
}
ast_node_init_function_declaration(
node,
func_name_token.value,
return_type,
return_node
);
return true;
}
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