/// <summary>
/// This is the lowest level of abstraction for an expression. Checks which is the
/// factor being used as an expression, retrieves this information, and calls the
/// necessesary functions in <see cref="QuadrupleManager"/> that handles each case
/// individually.
/// Called by <see cref="TERM"/>.
/// </summary>
void FACTOR()
{
if (la.kind == 10) // '('
// push a fake bottom
{
QuadrupleManager.PushFakeBottom();
Get();
SUPER_EXP();
Expect(12); // ')'
// exit fake bottom
QuadrupleManager.PopFakeBottom();
}
else if (StartOf(6))
{
if (la.kind == 37) // negative sign
{
Get();
QuadrupleManager.PushOperator(SemanticCubeUtilities.Operators.negative);
}
if (la.kind == 4) // number constant
{
Get();
try { QuadrupleManager.ReadConstantNumber(Int32.Parse(t.val)); }
catch (Exception e) { SemErr(e.Message); }
}
else if (la.kind == 1) // id
{
Get();
string id = t.val;
if (la.kind == 22) // '.' character
{
try
{
QuadrupleManager.ReadAssetId(id);
Get();
ATTRIBUTE(); // we don't need to verify the attribute as the UI forces the user to select a valid one
}
catch (Exception e) { SemErr(e.Message); }
}
else
{
try { QuadrupleManager.ReadIDVariable(id); }
catch (Exception e) { SemErr(e.Message); }
}
}
else if (la.kind == 19) // "call"
{
CALL_TO_FUNCTION();
}
else if (la.kind == 2 || la.kind == 3) // true or false
{
BOOL();
}
else if (la.kind == 5) // string constant
{
Get();
try { QuadrupleManager.ReadConstantText(t.val); }
catch (Exception e) { SemErr(e.Message); }
}
else
{
SynErr(60); // invalid FACTOR
}
try { QuadrupleManager.PopOperator(SemanticCubeUtilities.OperatorToPriority(SemanticCubeUtilities.Operators.negative)); }
catch (Exception e) { SemErr(e.Message); }
}
else
{
SynErr(61); // invalid FACTOR
}
}