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Americano
=========

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Americano is a parser and evaluator for a restricted subset of JavaScript, written in Python.

.. code-block:: python

>>> from americano import parse
>>> p = parse('var == 4')
>>> p.eval({'var': 4})
True
>>> p.eval({'var': 5})
False

The language accepted is a restricted subset of javascript. The input must be an expression, not a statement.
The following operators are supported:
* ternary operator (?:)
* logical operators (||, &&)
* comparison operators (===, ==, !===, !=, <. <=, >, >=)
* addition/subtraction (+, -)
* multiplication/division (*, /)
* unary logical not (!)
* unary negation/plus (-, +)
* function invocation('(')
* computed member access ('[')

In addition, the following syntax constructs are supported:

* array literal
* null
* true
* false
* single quoted string
* double quoted string
* floating point literal (no exponential notation)
* integer literal

It is implemented using a variation of a Crockford TDOP style Pratt parser modified to support creation of an evaluable node tree on parse.

See these links for algorithm details:

* http://javascript.crockford.com/tdop/tdop.html
* http://eli.thegreenplace.net/2010/01/02/top-down-operator-precedence-parsing/

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