pyxb.utils.fac.Configuration

For deterministic automata, this is generally a Configuration which records the current automaton state along with its counter values.

acceptableSymbols(self)

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Return the acceptable Symbols given the current configuration.

This method extracts the symbol from all candidate transitions that are permitted based on the current counter values. Because transitions are presented in a preferred order, the symbols are as well.

step(self, symbol)

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Execute an automaton transition using the given symbol.

Parameters:

symbol - A symbol from the alphabet of the automaton's language. This is a Python value that should be accepted by the SymbolMatch_mixin.match method of a State.symbol. It is not a Symbol instance.

Returns:

The new configuration resulting from the step.

Raises:

AutomatonStepError - UnrecognizedSymbolError when no transition compatible with symbol is available, and NondeterministicSymbolError if symbol admits multiple transitions and the subclass does not support non-deterministic steps (see MultiConfiguration).

Warning: If the step entered or left a sub-automaton the return value will not be the configuration that was used to execute the step. The proper pattern for using this method is:

  cfg = cfg.step(sym)

Class Configuration_ABC

acceptableSymbols(self)

step(self, symbol)