private static Expression CompileExistence(Op op, Scope scope)
{
var p = scope.FreeVariable("ref");
var @ref = new Literal {Value = p.Name};
var fst = new Parens {Body = new Assign {Variable = @ref, Value = op.First}};
return Compile(new If {Condition = new Existence {Expression = fst}, Body = @ref, ElseBody = op.Second}, scope);
}
public static Expression CompileLiteral(Literal node, Scope scope)
{
//TODO: need to determine if we are doing a value or a variable
var value = node.Value;
int i;
if (int.TryParse(value, out i))
return Expression.Constant(i, ObjectType);
long l;
if (long.TryParse(value, out l))
return Expression.Constant(l, ObjectType);
if ((value.StartsWith("'") && value.EndsWith("'")) || (value.StartsWith("\"") && value.EndsWith("\"")))
{
//de-quote
value = value.Substring(1, value.Length - 2);
return Expression.Constant(value, ObjectType);
}
//TODO: we should not be creating variables here. Only upon assignment.
var p = scope.GetVariableExpression(value);
if (p == null)
{
return RuntimeHelpers.CreateThrowExpression(typeof(MissingMemberException), "'" + value + "' is undefined.");
}
Helper.IsNotNull(p);
return p;
}