private Surface.Expr Term()
{
Surface.Expr left = Factor();
int type = lookahead.Type;
switch (type)
{
case SchoolLexer.MUL:
case SchoolLexer.DIV:
Consume();
break;
default:
return(left);
}
Surface.Expr right = Term();
Surface.Expr expr;
switch (type)
{
case SchoolLexer.MUL:
expr = new Surface.Mul(left, right);
break;
case SchoolLexer.DIV:
expr = new Surface.Div(left, right);
break;
default:
throw new ParserException("unreachable code");
}
return(expr);
}
Core.Expr Surface.IExprVisitor <Core.Expr> .Visit(Surface.Div div)
{
Core.Expr left = div.Left.Accept(this);
Core.Expr right = div.Right.Accept(this);
return(new Core.FunApp("div", new Core.Expr[] { left, right }));
}
object Surface.IExprVisitor <object> .Visit(Surface.Div div)
{
PrintBinaryOperator(div, '/');
return(null);
}