/usr/share/pyshared/pyke/bc_rule.py is in python-pyke 1.1.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# coding=utf-8
#
# Copyright © 2007-2008 Bruce Frederiksen
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import functools
from pyke import fc_rule, immutable_dict
class bc_rule(fc_rule.rule):
''' This represents a single backward-chaining rule. Most of its
behavior is inherited.
'''
def __init__(self, name, rule_base, goal_name, bc_fn, plan_fn,
goal_arg_patterns, plan_vars, patterns):
super(bc_rule, self).__init__(name, rule_base, patterns)
self.goal_name = goal_name
self.orig_bc_fn = bc_fn
self.bc_fn = bc_fn
self.plan_fn = plan_fn
self.goal_arg_pats = goal_arg_patterns
self.plan_vars = plan_vars
rule_base.add_bc_rule(self)
def goal_arg_patterns(self):
return self.goal_arg_pats
def make_plan(self, context, final):
return functools.partial(self.plan_fn,
immutable_dict.immutable_dict(
(var_name, context.lookup_data(var_name, final=final))
for var_name in self.plan_vars))
def trace(self):
self.bc_fn = self.surrogate
def surrogate(self, rule, arg_patterns, arg_context):
print "%s.%s%s" % (rule.rule_base.root_name, rule.name,
tuple(arg.as_data(arg_context, True)
for arg in arg_patterns))
for prototype_plan in self.orig_bc_fn(rule, arg_patterns, arg_context):
print "%s.%s succeeded with %s" % \
(rule.rule_base.root_name, rule.name,
tuple(arg.as_data(arg_context, True)
for arg in arg_patterns))
yield prototype_plan
print "%s.%s failed" % (rule.rule_base.root_name, rule.name)
def untrace(self):
self.bc_fn = self.orig_bc_fn
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