Scanner hooks

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As indicated above, the following SeText specification:

@terminals:
  IDTK = "$?[a-zA-Z_][a-zA-Z0-9_]*" {scanID};
end

defines a terminal IDTK, which if recognized, is passed to a scanID method for post-processing. If such a call back hook method is specified, a (non-generic) hooks class is required. It can be specified as follows:

@hooks some.package.SomeHooks;

As for all Java types, imports can be used. For this example, the some.package.SomeHooks class must have a default (parameterless) constructor, and an instance method with the following signature:

public void scanID(Token token);

where the Token class is the org.eclipse.escet.setext.runtime.Token class. The method may perform in-place modifications to the text field of the token parameter.

It is allowed to throw org.eclipse.escet.setext.runtime.exceptions.SyntaxException exceptions in the hooks methods.

Note that each generated scanner has an inner interface named Hooks that defines all the required call back hook methods. The hooks class must implement the interface. This does not apply to scanners that don’t have any terminals with call back hooks.