/usr/lib/python2.7/dist-packages/pyke/special.py is in python-pyke 1.1.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 | # $Id: special.py 081917d30609 2010-03-05 mtnyogi $
# 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 subprocess
import contextlib
from pyke import knowledge_base, rule_base
# claim_goal, fact, prove_all, gather_all
class special_knowledge_base(knowledge_base.knowledge_base):
def __init__(self, engine):
super(special_knowledge_base, self).__init__(engine, 'special')
def add_fn(self, fn):
if fn.name in self.entity_lists:
raise KeyError("%s.%s already exists" % (self.name, fn.name))
self.entity_lists[fn.name] = fn
def print_stats(self, f):
pass
class special_fn(knowledge_base.knowledge_entity_list):
def __init__(self, special_base, name):
super(special_fn, self).__init__(name)
special_base.add_fn(self)
def lookup(self, bindings, pat_context, patterns):
raise AssertionError("special.%s may not be used in forward chaining "
"rules" % self.name)
def prove(self, bindings, pat_context, patterns):
raise AssertionError("special.%s may not be used in backward chaining "
"rules" % self.name)
class special_both(special_fn):
def prove(self, bindings, pat_context, patterns):
return self.lookup(bindings, pat_context, patterns)
class claim_goal(special_fn):
r'''
>>> class stub(object):
... def add_fn(self, fn): pass
>>> cg = claim_goal(stub())
>>> mgr = cg.prove(None, None, None)
>>> gen = iter(mgr.__enter__())
>>> gen.next()
>>> gen.next()
Traceback (most recent call last):
...
StopProof
>>> mgr.__exit__(None, None, None)
>>> cg.lookup(None, None, None)
Traceback (most recent call last):
...
AssertionError: special.claim_goal may not be used in forward chaining rules
'''
def __init__(self, special_base):
super(claim_goal, self).__init__(special_base, 'claim_goal')
def prove(self, bindings, pat_context, patterns):
def gen():
yield
raise rule_base.StopProof
return contextlib.closing(gen())
def run_cmd(pat_context, cmd_pat, cwd_pat=None, stdin_pat=None):
r'''
>>> from pyke import pattern
>>> run_cmd(None, pattern.pattern_literal(('true',)))
(0, '', '')
>>> run_cmd(None, pattern.pattern_literal(('false',)))
(1, '', '')
>>> ret, out, err = run_cmd(None, pattern.pattern_literal(('pwd',)))
>>> ret
0
>>> err
''
>>> import os
>>> cwd = os.getcwd() + '\n'
>>> out == cwd
True
>>> run_cmd(None, pattern.pattern_literal(('pwd',)),
... pattern.pattern_literal('/dev'))
(0, '/dev\n', '')
'''
stdin = None if stdin_pat is None \
else stdin_pat.as_data(pat_context)
process = subprocess.Popen(cmd_pat.as_data(pat_context),
bufsize=-1,
universal_newlines=True,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
cwd= None if cwd_pat is None
else cwd_pat.as_data(pat_context))
out, err = process.communicate(stdin)
return process.returncode, out, err
class check_command(special_both):
r'''
>>> from pyke import pattern, contexts
>>> class stub(object):
... def add_fn(self, fn): pass
>>> cc = check_command(stub())
>>> ctxt = contexts.simple_context()
>>> mgr = cc.lookup(ctxt, ctxt, (pattern.pattern_literal(('true',)),))
>>> gen = iter(mgr.__enter__())
>>> gen.next()
>>> ctxt.dump()
>>> gen.next()
Traceback (most recent call last):
...
StopIteration
>>> ctxt.dump()
>>> mgr.__exit__(None, None, None)
>>> mgr = cc.lookup(ctxt, ctxt, (pattern.pattern_literal(('false',)),))
>>> gen = iter(mgr.__enter__())
>>> gen.next()
Traceback (most recent call last):
...
StopIteration
>>> ctxt.dump()
>>> mgr.__exit__(None, None, None)
>>> mgr = cc.prove(ctxt, ctxt, (pattern.pattern_literal(('true',)),))
>>> gen = iter(mgr.__enter__())
>>> gen.next()
>>> ctxt.dump()
>>> gen.next()
Traceback (most recent call last):
...
StopIteration
>>> ctxt.dump()
>>> mgr.__exit__(None, None, None)
'''
def __init__(self, special_base):
super(check_command, self).__init__(special_base, 'check_command')
def lookup(self, bindings, pat_context, patterns):
if len(patterns) < 1: return knowledge_base.Gen_empty
retcode, out, err = run_cmd(pat_context, patterns[0],
patterns[1] if len(patterns) > 1
else None,
patterns[2] if len(patterns) > 2
else None)
if retcode: return knowledge_base.Gen_empty
return knowledge_base.Gen_once
class command(special_both):
r'''
>>> from pyke import pattern, contexts
>>> class stub(object):
... def add_fn(self, fn): pass
>>> c = command(stub())
>>> ctxt = contexts.simple_context()
>>> mgr = c.lookup(ctxt, ctxt,
... (contexts.variable('ans'),
... pattern.pattern_literal(('echo', 'hi'))))
>>> gen = iter(mgr.__enter__())
>>> gen.next()
>>> ctxt.dump()
ans: ('hi',)
>>> gen.next()
Traceback (most recent call last):
...
StopIteration
>>> ctxt.dump()
>>> mgr.__exit__(None, None, None)
>>> mgr = c.lookup(ctxt, ctxt,
... (contexts.variable('ans'),
... pattern.pattern_literal(('cat',)),
... pattern.pattern_literal(None),
... pattern.pattern_literal('line1\nline2\nline3\n')))
>>> gen = iter(mgr.__enter__())
>>> gen.next()
>>> ctxt.dump()
ans: ('line1', 'line2', 'line3')
>>> gen.next()
Traceback (most recent call last):
...
StopIteration
>>> ctxt.dump()
>>> mgr.__exit__(None, None, None)
'''
def __init__(self, special_base):
super(command, self).__init__(special_base, 'command')
def lookup(self, bindings, pat_context, patterns):
if len(patterns) < 2: return knowledge_base.Gen_empty
retcode, out, err = run_cmd(pat_context, patterns[1],
patterns[2] if len(patterns) > 2
else None,
patterns[3] if len(patterns) > 3
else None)
if retcode != 0:
raise subprocess.CalledProcessError(
retcode,
' '.join(patterns[1].as_data(pat_context)))
def gen():
mark = bindings.mark(True)
try:
outlines = tuple(out.rstrip('\n').split('\n'))
if patterns[0].match_data(bindings, pat_context, outlines):
bindings.end_save_all_undo()
yield
else:
bindings.end_save_all_undo()
finally:
bindings.undo_to_mark(mark)
return contextlib.closing(gen())
class general_command(special_both):
r'''
>>> from pyke import pattern, contexts
>>> class stub(object):
... def add_fn(self, fn): pass
>>> gc = general_command(stub())
>>> ctxt = contexts.simple_context()
>>> ctxt.dump()
>>> mgr = gc.lookup(ctxt, ctxt,
... (contexts.variable('ans'),
... pattern.pattern_literal(('echo', 'hi'))))
>>> gen = iter(mgr.__enter__())
>>> gen.next()
>>> ctxt.dump()
ans: (0, 'hi\n', '')
>>> gen.next()
Traceback (most recent call last):
...
StopIteration
>>> ctxt.dump()
>>> mgr.__exit__(None, None, None)
'''
def __init__(self, special_base):
super(general_command, self).__init__(special_base, 'general_command')
def lookup(self, bindings, pat_context, patterns):
if len(patterns) < 2: return knowledge_base.Gen_empty
ans = run_cmd(pat_context, patterns[1],
patterns[2] if len(patterns) > 2 else None,
patterns[3] if len(patterns) > 3 else None)
def gen():
mark = bindings.mark(True)
try:
if patterns[0].match_data(bindings, pat_context, ans):
bindings.end_save_all_undo()
yield
else:
bindings.end_save_all_undo()
finally:
bindings.undo_to_mark(mark)
return contextlib.closing(gen())
def create_for(engine):
special_base = special_knowledge_base(engine)
claim_goal(special_base)
check_command(special_base)
command(special_base)
general_command(special_base)
|