34 lines
858 B
Python
Executable file
34 lines
858 B
Python
Executable file
#!/usr/bin/env python3
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import sys as _sys
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import json as _json
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def evaluate(node):
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# _sys.stderr.write("eval: %s\n" % _json.dumps(node))
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if (node["label"] == "constant_false"):
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return False
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elif (node["label"] == "constant_true"):
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return True
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elif (node["label"] == "negation"):
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return (not evaluate(node["children"][0]))
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elif (node["label"] == "conjunction"):
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return (evaluate(node["children"][0]) and evaluate(node["children"][1]))
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elif (node["label"] == "disjunction"):
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return (evaluate(node["children"][0]) or evaluate(node["children"][1]))
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elif (node["label"] == "priorised"):
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return evaluate(node["children"][0])
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else:
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raise ValueError("unhandled label: " + node["label"])
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def main():
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content = _sys.stdin.read()
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node = _json.loads(content)
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value = evaluate(node)
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_sys.stdout.write(_json.dumps(value) + "\n")
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main()
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