Re: Adding a feature to a parsed Eiffel File

urmuelle wrote:
> I am trying to add new features to already existing files by parsing
> them, adding the new features and then writing them back. What do i
> have to do apart from creating an instance of any of those feature
> types and adding it to a classes feature list?
> 
> Here is an example
> 
> a_class: ET_CLASS
> a_feature: ET_DEFERRED_PROCEDURE
> 
> a_class := ...
> 
> create a_feature.make (a_feature_name, Void, Void, Void, Void,
> clients, a_class)
> 
> create a_featurelist.make_with_capacity (a_class.features.count + 1)
> 				
> a_featurelist.force_first (a_feature)
> 
> from i:=0 until i=a_class.features.count loop
> 	i := i+1
> 	a_featurelist.force_first (a_class.features.item(i))
> end
> 
> a_class.set_features (a_featurelist, a_featurelist.count)
> 
> 
> 
> When going through the names after appending the new feature, it shows
> also the name of the new feature, but it is not appended when writing
> the AST back to a file.
> 
> 
> Can anyone help me?

When writing the AST back to a file using ET_AST_PRINTER, it
actually prints the features per feature clauses. The problem
is that your new feature is not part of a feature clause.

What to do: you can put your new feature in the feature clause
of an already existing feature from the same class:

    a_feature_clause: ET_FEATURE_CLAUSE
    ...
    a_feature_clause := other_feature.feature_clause
    a_feature.set_feature_clause (a_feature_clause)

Or you can decide to put it in a new feature clause. In
that case you will have to create a new object of type
ET_FEATURE_CLAUSE, add it to the class (create a new
`feature_clauses' with one more item, and assign it back
to the class using `set_feature_clauses'), and use
`set_feature_clause' to associate your new feature
with this new feature clause.

-- 
Eric Bezault
mailto:ericb-D6Qt/9opevxWk0Htik3J/[email protected]
http://www.gobosoft.com



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