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#
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# Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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# All rights reserved.
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# This component and the accompanying materials are made available
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# under the terms of "Eclipse Public License v1.0"
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# which accompanies this distribution, and is available
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# at the URL "http://www.eclipse.org/legal/epl-v10.html".
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#
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# Initial Contributors:
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# Nokia Corporation - initial contribution.
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#
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# Contributors:
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#
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# Description:
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#
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'''
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implementation for ruleml relations.
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'''
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import os
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import StringIO
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import logging
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import operator as ops
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import re
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import sys, traceback
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log = logging.getLogger('cone.ruleplugin.relations')
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from cone.public import api, rules, utils, exceptions, plugin
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class RelationFactory(api.FactoryBase):
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@ classmethod
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def get_relation_by_name(cls, relation_name):
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"""
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Get the class name by file extension.
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"""
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try:
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return rules.RELATIONS.get(relation_name)
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except KeyError:
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raise exceptions.NotSupportedException("No Relation class found for name %s" % relation_name)
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@ classmethod
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def get_relations(cls, relation):
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try:
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relations = []
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(left_expression,relation_name,right_expression) = parse_rule(relation)
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relation = cls.get_relation_by_name(relation_name)(left_expression, right_expression)
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relations.append(relation)
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propagated_relations = cls.get_relations(right_expression)
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if propagated_relations:
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for relation in propagated_relations:
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relations.append(relation)
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return relations
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except exceptions.ParseError:
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return None
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class ConfigurationBaseRelation(rules.BaseRelation):
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def __init__(self, left, right):
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super(ConfigurationBaseRelation, self).__init__(None, left, right)
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self.context = None
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class RequireRelation(ConfigurationBaseRelation):
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KEY = 'requires'
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relation_name = 'requires'
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def __init__(self, left, right):
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super(RequireRelation, self).__init__(left, right)
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class ConfigureRelation(ConfigurationBaseRelation):
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KEY = 'configures'
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relation_name = 'configures'
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def __init__(self, left, right):
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super(ConfigureRelation, self).__init__(left, right)
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# A plugin.RelationExecutionResult object is stored here
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self._execution_result = None
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def execute(self, context):
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self._execution_result = None
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exec_results = []
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result = rules.BaseRelation.execute(self, context)
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if len(exec_results) > 0:
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# There should be only one ConfigureExpression inside a ConfigureRelation
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if len(exec_results) > 1:
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log.warning("Execution of ConfigureRelation returned more than one result, ignoring all except the first")
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self._execution_result = exec_results[0]
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return result
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def get_execution_result(self):
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"""
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Return the execution result from the most recent call to execute().
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"""
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return self._execution_result
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def handle_configure(self, left, right):
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if left and right:
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return True
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elif not left:
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return True
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return False
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def handle_filenamejoin(self, left, right):
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def extract_dirname(path):
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"""Extract directory name (will always contain a trailing slash or backslash)"""
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pos = max(path.rfind('/'), path.rfind('\\'))
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if pos == -1: return path + '/'
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else: return path[:pos + 1]
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def extract_filename(path):
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pos = max(path.rfind('/'), path.rfind('\\'))
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if pos == -1: return path
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else: return path[pos + 1:]
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return extract_dirname(left) + extract_filename(right)
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class ConfigureExpression(rules.TwoOperatorExpression):
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PRECEDENCE = rules.PRECEDENCES['RELATION_OPERATORS']
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KEY = 'configures'
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OP = handle_configure
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def eval(self, context, **kwargs):
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input_refs = []
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affected_refs = []
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# Evaluate the left-hand side expression
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evaluated_left = self.left.eval(context, **kwargs)
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if evaluated_left:
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# If left evaluated to True, evaluate the right-hand side
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self.value = self.right.eval(context, **kwargs)
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else:
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self.value = True
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if not self.value:
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left_keys = []
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for ref in self.ast.extract_refs(str(self.left)):
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for key in context.get_keys(ref):
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left_keys.append(key)
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for key in left_keys:
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self.ast.add_error(key, { 'error_string' : 'CONFIGURES right side value is "False"',
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'left_key' : key,
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'rule' : self.ast.expression
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})
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return self.value
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class EvalExpression(rules.OneParamExpression):
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expression = "__eval__"
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PRECEDENCE = rules.PRECEDENCES['PREFIX_OPERATORS']
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KEY = '__eval__'
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def __init__(self, ast, expression):
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super(EvalExpression, self).__init__(ast, expression)
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self.expression = expression
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self._str_to_eval = eval(expression.expression)
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#self.default_view = default_view
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def extract_refs(self):
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result = []
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result.extend(utils.extract_delimited_tokens(self._str_to_eval, delimiters=('${', '}')))
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result.extend(utils.extract_delimited_tokens(self._str_to_eval, delimiters=('@{', '}')))
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return result
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def get_refs(self):
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return self.extract_refs()
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def eval(self, context, **kwargs):
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# Using the configuration to pass the eval globals dictionary to here,
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# since there isn't any easy way to do this more elegantly
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globals_and_locals = {}
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if hasattr(context, '_eval_expression_globals_dict'):
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globals_and_locals = context._eval_expression_globals_dict
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str_to_eval = self._str_to_eval
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def expand_feature_ref(ref, index):
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var_name = "__fea_%05d" % index
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globals_and_locals[var_name] = context.configuration.get_default_view().get_feature(ref)
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return var_name
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def expand_value_ref(ref, index):
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var_name = "__feaval_%05d" % index
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globals_and_locals[var_name] = context.configuration.get_default_view().get_feature(ref).get_value()
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return var_name
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str_to_eval = utils.expand_delimited_tokens(str_to_eval, expand_feature_ref, delimiters=('@{', '}'))
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str_to_eval = utils.expand_delimited_tokens(str_to_eval, expand_value_ref, delimiters=('${', '}'))
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# Strip leading and trailing whitespace to avoid indentation problems
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str_to_eval = str_to_eval.strip()
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ret = None
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try:
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ret = eval(str_to_eval, globals_and_locals)
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return ret
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except SyntaxError, e:
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logging.getLogger('cone.ruleml').warning("Invalid syntax in eval: %s" % (str_to_eval) )
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self.ast.add_error(self.expression, { 'error_string' : 'Invalid syntax in eval', 'str_to_eval' : str_to_eval, 'rule' : self.ast.expression })
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except Exception, e:
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logging.getLogger('cone.ruleml').warning("Execution failed for eval: %s %s: %s" % (str_to_eval, type(e), e) )
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self.ast.add_error(self.expression, { 'error_string' : 'Execution failed for eval', 'str_to_eval' : str_to_eval, 'rule' : self.ast.expression })
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class FilenamejoinExpression(rules.TwoOperatorExpression):
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expression = "filenamejoin"
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PRECEDENCE = rules.PRECEDENCES['ADDSUB_OPERATORS']
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KEY = 'filenamejoin'
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OP = handle_filenamejoin
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# Register relations and operators to rules
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rules.RELATIONS[RequireRelation.KEY] = RequireRelation
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rules.RELATIONS[ConfigureRelation.KEY] = ConfigureRelation
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rules.OPERATORS[FilenamejoinExpression.KEY] = FilenamejoinExpression
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rules.OPERATORS[EvalExpression.KEY] = EvalExpression
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rules.OPERATORS[ConfigureExpression.KEY] = ConfigureExpression
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def parse_rule(rulestring):
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"""
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Divide the given rule string into (left side, relation, right side) components.
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@return: Triple (left side, relation, right side)
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"""
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left_expression = ''
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relation_name = None
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right_expression = ''
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for token in rules.get_tokens(rulestring):
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if relation_name == None:
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if token in rules.RELATIONS.keys():
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relation_name = token
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else:
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left_expression += ' ' + token
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else:
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right_expression += ' ' + token
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if relation_name == None:
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raise exceptions.ParseError('invalid rule definition %s' % rulestring)
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return (left_expression,relation_name,right_expression)
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