private Statement expressionStatement()
{
Expr expr = expression();
if (expr is Expr.AssignExpr || expr is Expr.Call || expr is Expr.Set || expr is Expr.postfix || expr is Expr.prefix || expr is Expr.Variable || expr is Expr.Literal || expr is Expr.Super || expr is Expr.This) //Take out Literal
{
consume(TokenType.SEMICOLON, "Expect ';' after expression.");
return(new Statement.Expression(expr));
}
if ((expr is Expr.TernaryExpr && ((Expr.TernaryExpr)expr).isNullAccessor)) //Optional semicolon, but doesn't print after evaluation.
{
match(TokenType.SEMICOLON);
return(new Statement.Expression(expr));
}
if (!inBlock)
{
match(TokenType.SEMICOLON);
return(new Statement.Print(expr));
}
throw error(previous(), "Cannot use REPL inside a body." + expr.GetType());
}
private Expr assignment()
{
Expr expr = ternaryExpression();
if (match(TokenType.EQUALS))
{
Token equals = previous();
Expr value = assignment();
if (expr is Expr.Variable)
{
Token name = ((Expr.Variable)expr).name;
return(new Expr.AssignExpr(name, value));
}
else if (expr is Expr.Get)
{
Expr.Get get = (Expr.Get)expr;
return(new Expr.Set(get._object, get.name, value, get.isCascading));
}
throw error(equals, "Invalid assignment target: " + expr.GetType());
}
return(expr);
}