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#!/usr/bin/env python
#****************************************************************************
# conditional.py, provides a class to store comparison functions
#
# TreeLine, an information storage program
# Copyright (C) 2006, Douglas W. Bell
#
# This is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License, either Version 2 or any later
# version. This program is distributed in the hope that it will be useful,
# but WITTHOUT ANY WARRANTY. See the included LICENSE file for details.
#*****************************************************************************
import re
class Conditional(object):
"""Stores & evaluates conditional comparisons for dictionary data"""
parseRe = re.compile(r'((?:and)|(?:or)) (\S+) (.+?) '
r'(?:(?<!\\)"|(?<=\\\\)")(.*?)'
r'(?:(?<!\\)"|(?<=\\\\)")')
def __init__(self, conditionStr=''):
"""Accepts a string in format 'fieldName == "value" and
otherFieldName > "value"'"""
self.conditionList = []
self.formatName = '' # used only for evaluateType()
for boolOper, fieldName, oper, value in \
Conditional.parseRe.findall('and ' + conditionStr):
value = value.replace('\\"', '"').replace('\\\\', '\\')
self.conditionList.append(ConditionLine(boolOper, fieldName,
oper, value))
def evaluate(self, data):
"""Return the boolean result without checking format type"""
result = True
for condition in self.conditionList:
result = condition.evalFunc(data, result)
return result
def evaluateType(self, item):
"""Return the boolean result with a type check"""
if item.formatName == self.formatName:
return self.evaluate(item.data)
return False
def conditionText(self):
"""Return the condition string for this conditional set"""
return ' '.join([cond.conditionText() for cond in
self.conditionList])[4:]
def setupFields(self, nodeFormat):
"""Set fieldNames used in lines to field references"""
for condition in self.conditionList[:]:
condition.setupFields(nodeFormat)
if not condition.field:
self.conditionList.remove(condition)
def __len__(self):
"""Return number of conditions for truth testing"""
return len(self.conditionList)
def __deepcopy__(self, memo):
"""Avoid problems with deepcopy of a ref to instance's own method"""
return Conditional(self.conditionText())
class ConditionLine(object):
"""Stores & evaluates a portion of a conditional comparison"""
def __init__(self, boolOper, fieldName, oper, value):
self.boolOper = boolOper
self.tmpFieldName = fieldName
self.field = None
self.oper = oper
self.valueStr = value
self.value = None
functions = {'==': self.equalFunc, '<': self.lessFunc,
'<=': self.lessEqualFunc, '>': self.greaterFunc,
'>=': self.greaterEqualFunc, '!=': self.notEqualFunc,
'starts with': self.startsWithFunc,
'ends with': self.endsWithFunc,
'contains': self.containsFunc,
'True': self.trueFunc, 'False': self.falseFunc}
self.compareFunc = functions[self.oper]
if self.boolOper == 'and':
self.evalFunc = self.andFunc
else:
self.evalFunc = self.orFunc
def conditionText(self):
"""Return the text line for this condition"""
value = self.valueStr.replace('\\', '\\\\').replace('"', '\\"')
return '%s %s %s "%s"' % (self.boolOper, self.field.name,
self.oper, value)
def setupFields(self, nodeFormat):
"""Set fieldNames used to field references"""
if not self.tmpFieldName:
self.tmpFieldName = self.field.name
self.field = nodeFormat.findField(self.tmpFieldName)
if self.field:
self.value = self.field.sortValue({self.field.name: self.valueStr})
self.tmpFieldName = ''
def andFunc(self, data, prevResult=True):
"""Evaluates boolean combination"""
return prevResult and self.compareFunc(data)
def orFunc(self, data, prevResult=True):
"""Evaluates boolean combination"""
return prevResult or self.compareFunc(data)
def equalFunc(self, data):
"""Evaluates main condition (==)"""
return self.field.sortValue(data) == \
self.field.adjustedCompareValue(self.value)
def lessFunc(self, data):
"""Evaluates main condition (<)"""
return self.field.sortValue(data) < \
self.field.adjustedCompareValue(self.value)
def lessEqualFunc(self, data):
"""Evaluates main condition (<=)"""
return self.field.sortValue(data) <= \
self.field.adjustedCompareValue(self.value)
def greaterFunc(self, data):
"""Evaluates main condition (>)"""
return self.field.sortValue(data) > \
self.field.adjustedCompareValue(self.value)
def greaterEqualFunc(self, data):
"""Evaluates main condition (>=)"""
return self.field.sortValue(data) >= \
self.field.adjustedCompareValue(self.value)
def notEqualFunc(self, data):
"""Evaluates main condition (!=)"""
return self.field.sortValue(data) != \
self.field.adjustedCompareValue(self.value)
def startsWithFunc(self, data):
"""Evaluates main condition (starts with)"""
return unicode(self.field.sortValue(data)).\
startswith(unicode(self.value))
def endsWithFunc(self, data):
"""Evaluates main condition (ends with)"""
return unicode(self.field.sortValue(data)).\
endswith(unicode(self.value))
def containsFunc(self, data):
"""Evaluates main condition (contains)"""
return unicode(self.field.sortValue(data)).\
find(unicode(self.value)) >= 0
def trueFunc(self, data):
"""Evaluates main condition (always true)"""
return True
def falseFunc(self, data):
"""Evaluates main condition (always false)"""
return False
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