void parser_t::BracketTerm() {
parsetree.push(NT_BracketTerm);
switch (scanner.next_token()) {
case T_openparen:
scanner.eat_token(T_openparen);
cerr_buffer.push_back("(");
Expression();
scanner.eat_token(T_closeparen);
cerr_buffer.push_back(")");
break;
case T_m:
scanner.eat_token(T_m);
scanner.eat_token(T_opensquare);
cerr_buffer.push_back("m[");
Expression();
scanner.eat_token(T_closesquare);
cerr_buffer.push_back("]");
break;
case T_num:
scanner.eat_token(T_num);
cerr_buffer.push_back(scanner.get_number());
break;
default:
syntax_error(NT_BracketTerm);
}
parsetree.pop();
}
void parser_t::Label() {
parsetree.push(NT_Label);
scanner.eat_token(T_label);
scanner.eat_token(T_num);
scanner.eat_token(T_colon);
cerr_buffer.push_back("L" + scanner.get_number() + ":\n");
parsetree.pop();
}
void parser_t::Jump() {
parsetree.push(NT_Jump);
scanner.eat_token(T_goto);
scanner.eat_token(T_num);
cerr_buffer.push_back("goto L" + scanner.get_number() + ";\n");
if (scanner.next_token() == T_if) {
scanner.eat_token(T_if);
// Insert if statement before goto
string goto_str = cerr_buffer.back();
cerr_buffer.pop_back();
cerr_buffer.push_back("if (");
Expression();
cerr_buffer.push_back(") {\n");
cerr_buffer.push_back(goto_str);
cerr_buffer.push_back("}\n");
}
parsetree.pop();
}
int parser_t::Fact()
{
int v;
parsetree.push(NT_Fact);
switch (scanner.next_token())
{
case T_num:
v = scanner.get_number();
eat_token(T_num);
break;
case T_openparen:
eat_token(T_openparen);
v = Expr(v);
eat_token(T_closeparen);
break;
default:
syntax_error(NT_Fact);
break;
}
parsetree.pop();
return v;
}