tag-expressions
===============
Package to evaluate logical tag expressions by using a modified version of the `Shunting Yard algorithm <https://en.wikipedia.org/wiki/Shunting-yard_algorithm>`_.
This package is a Python port of cucumbers tag expression.
It's also used by `radish <https://github.com/radish-bdd/radish>`_.
|Build Status| |PyPI package version| |PyPI python versions|
Installing
----------
.. code:: bash
$ pip install tag-expressions
Here is a tease
---------------
.. code:: python
>>> from tagexpressions import parse
>>>
>>> expression = '( a and b ) or ( c and d )'
>>> compiled_expression = parse(expression)
>>> print(compiled_expression)
( ( a and b ) or ( c and d ) )
>>>
>>> data = ['a', 'b', 'c', 'd']
>>> assert compiled_expression.evaluate(data) == True
>>>
>>> data = ['a', 'c']
>>> assert compiled_expression.evaluate(data) == False
>>>
>>>
>>> expression = 'not a or b and not c or not d or e and f'
>>> compiled_expression = parse(expression)
>>> print(compiled_expression)
( ( ( not ( a ) or ( b and not ( c ) ) ) or not ( d ) ) or ( e and f ) )
>>>
>>> data = ['b', 'e', 'f']
>>> assert compiled_expression.evaluate(data) == True
>>>
>>> data = ['a', 'c', 'd']
>>> assert compiled_expression.evaluate(data) == False
Usage
-----
Available operators
~~~~~~~~~~~~~~~~~~~
* **or** - "or" conjunction of two given variables
* **and** - "and" conjunction of two given variables
* **not** - negation of a single variable
Every other token given in an *infix* is considered a variable.
Operator precedence
~~~~~~~~~~~~~~~~~~~
From high to low:
* ()
* or
* and
* not
.. |Build Status| image:: https://travis-ci.org/timofurrer/tag-expressions.png?branch=master
:target: https://travis-ci.org/timofurrer/tag-expressions
.. |PyPI package version| image:: https://badge.fury.io/py/tag-expressions.svg
:target: https://badge.fury.io/py/tag-expressions
.. |PyPI python versions| image:: https://img.shields.io/pypi/pyversions/tag-expressions.svg
:target: https://pypi.python.org/pypi/tag-expressions
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"description": "tag-expressions\n===============\n\nPackage to evaluate logical tag expressions by using a modified version of the `Shunting Yard algorithm <https://en.wikipedia.org/wiki/Shunting-yard_algorithm>`_.\nThis package is a Python port of cucumbers tag expression.\n\nIt's also used by `radish <https://github.com/radish-bdd/radish>`_.\n\n|Build Status| |PyPI package version| |PyPI python versions|\n\n\nInstalling\n----------\n\n.. code:: bash\n\n $ pip install tag-expressions\n\nHere is a tease\n---------------\n\n\n.. code:: python\n\n >>> from tagexpressions import parse\n >>>\n >>> expression = '( a and b ) or ( c and d )'\n >>> compiled_expression = parse(expression)\n >>> print(compiled_expression)\n ( ( a and b ) or ( c and d ) )\n >>>\n >>> data = ['a', 'b', 'c', 'd']\n >>> assert compiled_expression.evaluate(data) == True\n >>>\n >>> data = ['a', 'c']\n >>> assert compiled_expression.evaluate(data) == False\n >>>\n >>>\n >>> expression = 'not a or b and not c or not d or e and f'\n >>> compiled_expression = parse(expression)\n >>> print(compiled_expression)\n ( ( ( not ( a ) or ( b and not ( c ) ) ) or not ( d ) ) or ( e and f ) )\n >>>\n >>> data = ['b', 'e', 'f']\n >>> assert compiled_expression.evaluate(data) == True\n >>>\n >>> data = ['a', 'c', 'd']\n >>> assert compiled_expression.evaluate(data) == False\n\n\nUsage\n-----\n\nAvailable operators\n~~~~~~~~~~~~~~~~~~~\n\n* **or** - \"or\" conjunction of two given variables\n* **and** - \"and\" conjunction of two given variables\n* **not** - negation of a single variable\n\nEvery other token given in an *infix* is considered a variable.\n\nOperator precedence\n~~~~~~~~~~~~~~~~~~~\n\nFrom high to low:\n\n* ()\n* or\n* and\n* not\n\n.. |Build Status| image:: https://travis-ci.org/timofurrer/tag-expressions.png?branch=master\n :target: https://travis-ci.org/timofurrer/tag-expressions\n.. |PyPI package version| image:: https://badge.fury.io/py/tag-expressions.svg\n :target: https://badge.fury.io/py/tag-expressions\n.. |PyPI python versions| image:: https://img.shields.io/pypi/pyversions/tag-expressions.svg\n :target: https://pypi.python.org/pypi/tag-expressions\n",
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