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special.py    282 lines (268 with data), 10.8 kB

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# $Id$
# coding=utf-8
#
# Copyright Š 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):
...
pyke.rule_base.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('/home/bruce'))
(0, '/home/bruce\n', '')
'''
stdin = None
if stdin_pat is not None:
data = stdin_pat.as_data(pat_context)
if data is not None:
stdin = data.encode()
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)
def test():
import doctest
import sys
sys.exit(doctest.testmod()[0])
if __name__ == "__main__":
test()