103 lines
2.9 KiB
Python
103 lines
2.9 KiB
Python
from __future__ import print_function
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from ipykernel.ipkernel import IPythonKernel
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import sys
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import signal
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import yap
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# import ipdb
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# ipdb,set_trace()
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kernel_json = {
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"argv": [sys.executable,
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"-m", "yap_kernel",
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"-f", "{connection_file}"],
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"display_name": " YAP-6.3",
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"language": "prolog",
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"name": "yap_kernel",
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}
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def eprint(*args, **kwargs):
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print(*args, file=sys.stderr, **kwargs)
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class YAPKernel(IPythonKernel):
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implementation = 'MetaKernel YAP'
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implementation_version = '1.0'
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language = 'text'
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language_version = '0.1'
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banner = "YAP-6.3"
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language_info = {
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'mimetype': 'text/prolog',
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'name': 'text',
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# ------ If different from 'language':
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'codemirror_mode': {
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"version": 2,
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"name": "prolog"
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},
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'pygments_lexer': 'prolog',
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'version': "0.0.1",
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'file_extension': '.yap',
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}
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def init_yap(self, **kwargs):
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# Signal handlers are inherited by
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# forked processes,
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# and we can't easily
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# reset it from the subprocess. Since kernelapp
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# ignores SIGINT except in
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# message handlers, we need to temporarily
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# reset the SIGINT handler
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# here so that yap and its children are interruptible.
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sig = signal.signal(signal.SIGINT, signal.SIG_DFL)
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try:
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self.engine = yap.YAPEngine()
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self.q = None
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self.engine.query("load_files(library(python), [])").command()
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self.engine.query("load_files(library(jupyter), [])").command()
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banner = "YAP6-3 Kernel"
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self.olines = banner
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finally:
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signal.signal(signal.SIGINT, sig)
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def __init__(self, **kwargs):
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super(YAPKernel, self).__init__(**kwargs)
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self.init_yap(**kwargs)
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self.shell.run_cell = self.yap_run_cell
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def get_usage(self):
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return "This is the YAP kernel."
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def yap_run_cell(self, s, store_history=False, silent=False,
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shell_futures=True):
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if not self.q:
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self.q = self.engine.query(s)
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if self.q.next():
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myvs = self.q.namedVarsCopy()
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if myvs:
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i = 0
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for peq in myvs:
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name = peq[0]
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bind = peq[1]
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if bind.isVar():
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var = yap.YAPAtom('$VAR')
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f = yap.YAPFunctor(var, 1)
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bind.unify(yap.YAPApplTerm(f, (name)))
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else:
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i = bind.numberVars(i, True)
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print(name.text() + " = " + bind.text())
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print("yes")
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if self.q.deterministic():
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self.closeq()
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return
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print("No (more) answers")
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self.closeq()
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return
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def closeq(self):
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if self.q:
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self.q.close()
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self.q = None
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