Testing of aPTK GrammarsΒΆ

Another feature of aPTK is, that you can define your grammar-rule testcases right in your grammar:

:grammar AddGrammar1

<addition> @- <term> "+" <term>
<term>     #= \d+
<ws>       := \s*

So far our grammar, now here follow the tests:

  1. Test, if addition matches some term:

    <addition> ~~ "5 + 4"
    
  2. Test, if addition matches some term and produces some special syntax-tree:

    <addition> ~~ "5 + 4" -> addition( term( '5' ), term( '4' ) )
    
  3. Test, if addition produces right AST:

    <addition> ~~ "5 + 5" --> [5, 5]
    

    In this case default ParseActions have been used. To use a different parse-action class you can specify it between the “-” and “->”, for the above you could also write explicitely:

    :parse-actions ParseActions aptk.actions.ParseActions
    
    <addition> =~ "5 + 5" -ParseActions-> [5, 5]
    
  4. Assert that addition does not match something:

    <addition> !~ "5- 4"
    

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