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This stuff is strictly thinking out aloud, musings that may well have little to do with the program, may be plain wrong out of date whatever. No attempt has been made to reflect the current state of the program in this chapter, this is just to brain storm.
Most stuff can be done as a Context Free grammar, except referencing of other cells/species requires a bit of monkeying in the background to extract the context. Why? When referring to own cell/specie one must use the current value of the variable. When referring to other cell/specie's one must use the value at the last time step, or evaluation order dependant behaviour occurs.
Need things like :-
mullet.optimal@tewate_bay
mullet@tewate_bay
mullet // Refers to current cell
optimal // Refers to current specie and current cell
// fullname is specieName.optimal
optimal@tewate_bay // Refers to current specie some cell.]
mullet.optimal // Refers to current cell
level@tewate_bay
Maybe one can shift the problem to the interpreter stage.
If we have
specieName -
op_loadImmediate cellList index
op_specieCell specieList index
specieName@cellName
op_loadImmediate cellList index
op_specieCell specieList index
variable -
op_loadImmediate cellList index
op_loadImmediate specieVarlist index
op_refer specieList index
Shifted to the specieName.variableName@cellName format instead of the specieName.variableName[
cellName] approach. Why? Easier to create '@' names on the idList. See See section Referencing internals for resolution of referencing
problems.
Resolved referencing problems by pushing three items onto the stack for every reference.
If specie or cell number was not applicable to particular reference, I push AIKONA instead. On a get() if specie number or cell number doesn't match with current specie/cell number, the old value is given, else the current value. On set() it is always the current value that is modified.
CAUTION: If you break the paradigm by letting specie A assign values to species B, then evaluation order specific behaviour will ensue. You can break the paradigm if you want to, but then it is up to you to bear the consequences.
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