Evaluate expressions in dict/json objects
Project description
dicteval
========
Library to evaluate expressions in dict/json objects.
Requirements
------------
* Python 3.6+
Basic Usage
-----------
Module ``dicteval`` will evaluate basic types with no modifications but it will
evaluate dicts (or json objects) containing keys started with ``=`` (equal)
symbol as an expression:
>>> from dicteval import dicteval
>>> dicteval(3)
3
>>> dicteval([3, 5])
[3, 5]
>>> dicteval((5, 3))
[5, 3]
>>> dicteval({"=sum": [3, 5]})
8
>>> dicteval({"=": 5}) # = symbol alone is a 'nop' function
5
You can provide a dictionary with context to be used during evaluation process.
Context will be used, eg, to evaluate string objects:
>>> dicteval({"=": "var = {var}"}, context={"var": 1})
'var = 1'
You can also wrap your string content with ``@{}`` to force a Python ``eval()``
with the context provided:
>>> dicteval({"=sum": [3, "@{var + 2}"]}, context={"var": 3})
8
Functions
---------
You can use the following builtin functions in your expressions:
Function ``=eq``
''''''''''''''''
Returns ``True`` if all elements of sequence are equals:
>>> dicteval({"=eq": [1, 1, 1, 1]})
True
Function ``=neq``
''''''''''''''''
Returns ``True`` if elements of sequence are different:
>>> dicteval({"=neq": [1, 1, 1, 5]})
True
Function ``=`` (or ``nop``)
'''''''''''''''''''''''''''
Returns the same values passed as arguments:
>>> dicteval({"=": [1, 2, 3, 4]})
[1, 2, 3, 4]
>>> dicteval({"=nop": "spam"})
'spam'
Function ``=not``
''''''''''''''''
Returns the boolean inverse of argument:
>>> dicteval({"=not": False})
True
>>> dicteval({"=not": True})
False
>>> dicteval({"=not": None})
True
>>> dicteval({"=not": "XYZ"})
False
Function ``=sum``
'''''''''''''''''
Returns a number with the sum of arguments:
>>> dicteval({"=sum": [3, 5]})
8
To Do
-----
- Add more functions to the builtin language
License
-------
This software is licensed under MIT license.
Project details
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