#include "../parser.h"
#include "../type.h"
#include "ast.h"

ast_node_t* new_ast_ident_node(tok_t* tok) {
    if (tok->type != TOKEN_IDENT) {
        error("syntax error: want identifier but got %d", tok->type);
    }
    ast_node_t* node = new_ast_node();
    node->type = NT_TERM_IDENT;
    node->syms.tok = *tok;
    node->syms.decl_node = NULL;
    return node;
}

ast_node_t* expect_pop_ident(tok_buf_t* tokbuf) {
    flush_peek_tok(tokbuf);
    tok_t* tok = peek_tok(tokbuf);
    ast_node_t* node = new_ast_ident_node(tok);
    pop_tok(tokbuf);
    return node;
}

ast_node_t* parse_type(parser_t* parser) {
    tok_buf_t* tokbuf = &parser->tokbuf;
    flush_peek_tok(tokbuf);
    tok_type_t ttype = peek_tok_type(tokbuf);
    data_type_t dtype;
    switch(ttype) {
        case TOKEN_VOID:    dtype = TYPE_VOID; break;
        case TOKEN_CHAR:    dtype = TYPE_CHAR; break;
        case TOKEN_SHORT:   dtype = TYPE_SHORT; break;
        case TOKEN_INT:     dtype = TYPE_INT; break;
        case TOKEN_LONG:    dtype = TYPE_LONG; break;
        case TOKEN_FLOAT:   dtype = TYPE_FLOAT; break;
        case TOKEN_DOUBLE:  dtype = TYPE_DOUBLE; break;
        default:
            error("无效的类型说明符");
    }

    ast_node_t* node = new_ast_node();
    node->type = NT_TERM_TYPE;
    // TODO added by disable warning, will add typing system
    dtype += 1;
    pop_tok(tokbuf);

    if (peek_tok_type(tokbuf) == TOKEN_MUL) {
        pop_tok(tokbuf);
    }
    return node;
}