# -*- coding: utf-8 -*-
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from __future__ import (print_function, division, unicode_literals,
absolute_import)
from sympathy.api import node as synode
from sympathy.api.nodeconfig import Port, Ports, Tag, Tags
from sympathy.api.exceptions import SyNodeError, sywarn
from sylib import util
ERROR_LEVEL = ['Error', 'Warning', 'Output']
[docs]class ConditionalError(synode.Node):
"""
Raise an error if the supplied predicate function returns True.
See https://docs.python.org/3/tutorial/controlflow.html#lambda-expressions
for a description of lambda functions. Have a look at the :ref:`Data type
APIs<datatypeapis>` to see what methods and attributes are available on the
data type that you are working with.
"""
name = 'Conditional error/warning'
author = u'Magnus Sandén'
version = '1.0'
icon = ''
description = "Raise an error if a predicate is True."
nodeid = 'org.sysess.sympathy.data.table.conditionalerror'
icon = 'error.svg'
tags = Tags(Tag.Development.Test)
inputs = Ports([Port.Custom('<a>', 'Input', name='in')])
outputs = Ports([Port.Custom('<a>', 'Output', name='out')])
parameters = synode.parameters()
parameters.set_string(
'predicate',
label='Predicate function:',
value='lambda arg: True # Identity filter',
description='Error message is printed if this function returns True.',
editor=synode.Util.code_editor())
parameters.set_string(
'error_msg',
label='Error message:',
value='Error!',
description='Error message to display to the user.')
parameters.set_list(
'error_type',
label='Severity:',
list=ERROR_LEVEL,
value=[0],
description='The level "Error" stops flow execution.',
editor=synode.Util.combo_editor())
def execute(self, node_context):
predicate_str = node_context.parameters['predicate'].value
error_type = node_context.parameters['error_type'].selected
error_msg = node_context.parameters['error_msg'].value
in_table = node_context.input['in']
out_table = node_context.output['out']
# Evaluate predicate function
if util.base_eval(predicate_str)(in_table):
if error_type == 'Error':
raise SyNodeError(error_msg)
elif error_type == 'Warning':
sywarn(error_msg)
elif error_type == 'Output':
print(error_msg)
else:
raise ValueError('Unknown error_type')
# Output is equal to input
out_table.source(in_table)
