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Date:2008-09-19T07:55:09.000000Z git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@27 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
30 lines
1.8 KiB
Plaintext
30 lines
1.8 KiB
Plaintext
[[Property:title|New expression dialog]]
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[[Property:weight|2]]
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[[Property:uuid|95a78497-434d-759f-fdce-f9025c891495]]
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Adding new expressions to the [[Evaluation tool or Watch tool|list of expressions]] that should be dynamically evaluated is performed via a dialog.
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<center>
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{|
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| [[Image:new-expression-definition-dlg]] <br/>
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context: Current feature
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| [[Image:new-expression-as-object-definition-dlg]] <br/>
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context: As object
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</center>
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The first part in the dialog makes it possible to select the context of the expression.
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* The default context is the context of the [[Information relative to a stack element|currently selected call stack element]] . This context gives access to the locals, the arguments, the result and the enclosing object features. <br/>
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* The object context, that requires a valid object address, gives access to the features of the selected object. But if the "As object" is selected, the result of the expression, is the pointed object it self; and you can name the object (see the second screenshot).
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* The last context, the class-related context, gives access to the once and constants features of that class. It requires a valid class name.
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The second part prompts for the expression itself. This field supports arguments, dot calls and operators (to a certain extent), but does not support creation expressions, agents or static calls (as in "feature {<eiffel>MY_CLASS</eiffel>}.<eiffel>my_feature</eiffel>"). Genericity is partially supported. Despite these limitations, we believe the expression evaluation tool should provide you with a lot of useful functionality.
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And the "Keep Assertion Checking" checkbox is used to enable assertion checking during expression evaluation if wanted (by default assertions won't be checked).
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