[limb-issues] Created: (WACT-4) Move required_attributes, enclosing_tag and allow_selfnesting into tags annotation text

[Sergey Yudin (JIRA)]

Move required_attributes, enclosing_tag and allow_selfnesting into tags annotation text
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                 Key: WACT-4
                 URL: http://jira.limb-project.com/browse/WACT-4
             Project: WACT
          Issue Type: Improvement
            Reporter: Sergey Yudin
         Assigned To: Sergey Yudin
            Priority: Minor


After some modifications in CompilerTag you can describe required tag attributes using protected $required_attributes array property of the tag, e.g.:

  protected $required_attributes = array('file');

This check is very primitive, it checks if the tag has such attribute and attribute has a constant value. It's ok for most of the cases. If you require attribute to have a particular value (e.g. you need to generate different code if attribute has a constant value or not) you should override preParse() method of the tag.

I think it would be great to improve tag dictionary functionality and to allow describe required attributes in tag annotation zone.

I also think we should implement both @req_attribute as well as @req_const_attribute to allow  attribute existing check and attribute existing with constant value check.

Moveover it would be nice to implement @allow_self_nesting flag and @parent_tag annotation fields as well. This will allow us to remove most of CheckNestingLevel() methods from tags.




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