Class ContentModel

x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Overrides: object.__init__

(inherited documentation)

Perform a single step in the content model. This is a pass-through to ContentModelState.evaluateContent for the appropriate state.

Parameters:

• state (int) - The starting state in this content model.

Determine whether this content model can be satisfied using the provided elements.

The general idea is to treat the transitions of the DFA as symbols in an alphabet. For each such transition, a sequence of values is provided to be associated with the transition. One transition is permitted for each value associated with the symbol. The symbol (key) None represents wildcard values.

If a path is found that uses every symbol in valid transitions and ends in a final state, the return value is a pair consisting of the unconsumed symbols and a sequence of term, value pairs that define the acceptable path. If no valid path through the DFA can be taken, None is returned.

Parameters:

• available_symbols - A map from leaf DFA terms to a sequence of values associated with the term in a binding instance. The key None is used to represent wildcard elements. If a key appears in this map, it must have at least one value in its sequence.
• succeed_at_dead_end - If True, states from which no transition can be made are accepted as final states. This is used when processing "all" model groups, where the content model for the current alternative must succeed while retaining the symbols that are needed for other alternatives.