com.github.fge.grappa.rules

Interface Action<V>

All Known Subinterfaces:

SkippableAction<V>

All Known Implementing Classes:

BaseAction

public interface Action<V>

Instances of classes implementing this interface can be used directly in a rule definition to define a parser action. If the class also implements the ContextAware interface it will be used to inform the object of the current parsing Context immediately before the invocation of the run(com.github.fge.grappa.run.context.Context<V>) method. Additionally, if the class implementing this interface is an inner class (anonymous or not) and its outer class(es) implement(s) ContextAware its outer class(es) will also be informed object of the current parsing Context immediately before the invocation of the action's run(com.github.fge.grappa.run.context.Context<V>) method. This allows simple anonymous action class implementations directly in the parser rule definitions, even when they access context-sensitive methods defined in the BaseActions or BaseParser classes.

NOTE! IMPORTANT! Right now there is a severe limitation that an Action instance, if it is to collect a value, must be the second or later rule of a SequenceMatcher. This limitation will be removed in the future.

See Also:

BaseActions.match()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	run(Context<V> context) Runs the parser action.

Method Detail

run

boolean run(Context<V> context)

Runs the parser action.

Parameters:

context - the current parsing context

Returns:

true if the parsing process is to proceed, false if the current rule is to fail