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gitmirror/docs/visitors.rst

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  1. Transformers & Visitors

  2. =======================

  3. 

  4. Transformers & Visitors provide a convenient interface to process the

  5. parse-trees that Lark returns.

  6. 

  7. They are used by inheriting from the correct class (visitor or transformer),

  8. and implementing methods corresponding to the rule you wish to process. Each

  9. method accepts the children as an argument. That can be modified using the

  10. ``v_args`` decorator, which allows to inline the arguments (akin to ``*args``),

  11. or add the tree ``meta`` property as an argument.

  12. 

  13. See: `visitors.py`_

  14. 

  15. .. _visitors.py: https://github.com/lark-parser/lark/blob/master/lark/visitors.py

  16. 

  17. Visitor

  18. -------

  19. 

  20. .. autoclass:: lark.visitors.VisitorBase

  21. 

  22. .. autoclass:: lark.visitors.Visitor

  23. 

  24. .. autoclass:: lark.visitors.Visitor_Recursive

  25. 

  26. 

  27. Transformer

  28. -----------

  29. 

  30. .. autoclass:: lark.visitors.Transformer

  31.     :members: __default__, __default_token__

  32. 

  33. Interpreter

  34. -----------

  35. 

  36. .. autoclass:: lark.visitors.Interpreter

  37. 

  38. v_args

  39. ------

  40. 

  41. .. autofunction:: lark.visitors.v_args

  42. 

  43. Discard

  44. -------

  45. 

  46. .. autoclass:: lark.visitors.Discard