51 lines
1.2 KiB
Python
51 lines
1.2 KiB
Python
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# python commands
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import sys
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import yap
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#
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# initialize engine
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engine = yap.YAPEngine();
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# engine = yap.YAPEngine(yap.YAPParams());
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def query( s ):
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q = engine.query(s)
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while q.next():
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vs = q.namedVars()
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if vs.length() == 0:
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print( "yes" )
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return
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else:
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while vs.length() > 0:
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eq = vs.car()
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print( eq.getArg(1).text() + " = " + eq.getArg(2).text() )
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vs = vs.cdr()
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if q.deterministic():
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return
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s = input("next: ?")
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if s.find(';') != 0 :
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return
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print( "no more answers" )
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return
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def live():
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loop = True
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while loop:
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try:
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s = input("?- ")
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query( s )
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except SyntaxError as err:
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print("Syntax Error error: {0}".format(err))
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except EOFError:
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return
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except RuntimeError as err:
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print("YAP Execution Error: {0}".format(err))
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except ValueError:
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print("Could not convert data to an integer.")
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except:
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print("Unexpected error:", sys.exc_info()[0])
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raise
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live()
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