.. _exprdef-py:


##########
exprdef.py
##########


exprdef test definitions::

    >>> from lxml import etree
    >>> import datetime
    >>> from pprint import pprint
    >>> from simo.builder.output.exprdef import ExpressionOutputDef
    >>> tdf = open('../../simulator/xml/schemas/Typedefs_SIMO.xsd')
    >>> typedef = tdf.read()
    >>> tdf.close()
    >>> sf = open('../../simulator/xml/schemas/expression_definition.xsd')
    >>> schema = sf.read()
    >>> sf.close()
    >>> xml = '''<?xml version="1.0" encoding="UTF-8"?>
    ... <expression_definition 
    ...     xmlns="http://www.simo-project.org/simo" 
    ...     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    ...     xsi:schemaLocation="http://www.simo-project.org/simo 
    ...         ../schemas/item_definition.xsd">
    ...     <initial_date>2009-01-01</initial_date>
    ...     <discount_rate>3.0</discount_rate>
    ...     <expressions>
    ...         <item>
    ...             <expression>sum[-1:-1](stratum:SP*stratum:HgM)</expression>
    ...             <label>1st item</label>
    ...         </item>
    ...         <item>
    ...             <expression>sum[-1:-1](operation:Volume)</expression>
    ...             <label>2nd item</label>
    ...         </item>
    ...     </expressions>
    ... </expression_definition>'''


**************************************
class ExpressionOutputDef(XmlObject):
**************************************

Expression output definitions.

def __init__(self, typedef):
============================

::

    >>> aodef = ExpressionOutputDef(typedef)
    >>> aodef.schema = schema
    >>> aodef.xml = ('test data', xml, None)


********************************
class ExpressionOutput(object):
********************************

Expressionoutput info.

def __init__(self, ns, root, validator):
==========================================

::

    >>> ao = aodef.obj['test data']
    >>> pprint(ao.data) # doctest: +NORMALIZE_WHITESPACE
    {'discount_rate': 3.0,
     'expression_variables': [{'expression': 'sum[-1:-1](stratum:SP*stratum:HgM)',
                               'label': '1st item'},
                              {'expression': 'sum[-1:-1](operation:Volume)',
                               'label': '2nd item'}],
     'initial_date': datetime.date(2009, 1, 1)}

def _parse(self, root):
=======================

Parses the agregation output instructions into self.data