// Parse a primary expression.
//
// primary-expr -> literal | identifier | '(' expr ')'
//
// literal -> integer-literal
// | boolean-literal
// | character-literal
// | string-literal
Expr*
Parser::primary_expr()
{
// identifier
if (Token tok = match_if(identifier_tok))
return on_id(tok);
// boolean-literal
if (Token tok = match_if(boolean_tok))
return on_bool(tok);
// integer-literal
if (Token tok = match_if(integer_tok))
return on_int(tok);
// character-literal
if (Token tok = match_if(character_tok))
return on_char(tok);
// string-literal
if (Token tok = match_if(string_tok))
return on_str(tok);
// paren-expr
if (match_if(lparen_tok)) {
Expr* e = expr();
match(rparen_tok);
return e;
}
// FIXME: Is this definitely an error? Or can we
// actually return nullptr and continue?
error("expected primary expression");
}
// Parse a primary expression.
//
// primary-expression ::=
// integer-literal
// | '(' expression ')'
Expr const*
Parser::primary()
{
if (Token tok = match_if(integer_tok))
return on_int(tok);
if (lookahead() == lparen_tok)
return paren();
error(ts_.location(), "expected primary-expression");
throw Parse_error("primary");
}
