227 lines
8.1 KiB
Python
227 lines
8.1 KiB
Python
"""
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Class which manages a Pantograph instance. All calls to the kernel uses this
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interface.
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"""
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import json, pexpect, pathlib, unittest, os
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from pantograph.expr import parse_expr, Expr, Variable, Goal, GoalState, \
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Tactic, TacticHave, TacticCalc
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def _get_proc_cwd():
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return pathlib.Path(__file__).parent
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def _get_proc_path():
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return _get_proc_cwd() / "pantograph"
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class ServerError(Exception):
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pass
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class Server:
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def __init__(self,
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imports=["Init"],
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project_path=None,
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lean_path=None,
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options=[],
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timeout=20,
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maxread=1000000):
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"""
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timeout: Amount of time to wait for execution
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maxread: Maximum number of characters to read (especially important for large proofs and catalogs)
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"""
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self.timeout = timeout
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self.imports = imports
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self.project_path = project_path if project_path else _get_proc_cwd()
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self.lean_path = lean_path
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self.maxread = maxread
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self.proc_path = _get_proc_path()
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self.options = options
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self.args = " ".join(imports + [f'--{opt}' for opt in options])
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self.proc = None
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self.restart()
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# List of goal states that should be garbage collected
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self.to_remove_goal_states = []
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def restart(self):
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if self.proc is not None:
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self.proc.close()
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env = os.environ
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if self.lean_path:
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env = env | {'LEAN_PATH': self.lean_path}
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self.proc = pexpect.spawn(
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f"{self.proc_path} {self.args}",
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encoding="utf-8",
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maxread=self.maxread,
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cwd=self.project_path,
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env=env,
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)
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self.proc.setecho(False)
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def run(self, cmd, payload):
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"""
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Runs a raw JSON command. Preferably use one of the commands below.
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"""
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s = json.dumps(payload)
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self.proc.sendline(f"{cmd} {s}")
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try:
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self.proc.expect("{.*}\r\n", timeout=self.timeout)
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output = self.proc.match.group()
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return json.loads(output)
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except pexpect.exceptions.TIMEOUT as exc:
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raise exc
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def gc(self):
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"""
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Garbage collect deleted goal states.
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Must be called periodically.
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"""
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if self.to_remove_goal_states:
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self.run('goal.delete', {'stateIds': self.to_remove_goal_states})
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self.to_remove_goal_states.clear()
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def expr_type(self, expr: str) -> Expr:
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"""
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Evaluate the type of a given expression. This gives an error if the
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input `expr` is ill-formed.
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"""
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result = self.run('expr.echo', {"expr": expr})
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if "error" in result:
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raise ServerError(result["desc"])
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return parse_expr(result["type"])
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def goal_start(self, expr: str) -> GoalState:
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result = self.run('goal.start', {"expr": str(expr)})
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if "error" in result:
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raise ServerError(result["desc"])
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return GoalState(state_id=result["stateId"], goals=[Goal.sentence(expr)], _sentinel=self.to_remove_goal_states)
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def goal_tactic(self, state: GoalState, goal_id: int, tactic: Tactic) -> GoalState:
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args = {"stateId": state.state_id, "goalId": goal_id}
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if isinstance(tactic, str):
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args["tactic"] = tactic
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elif isinstance(tactic, TacticHave):
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args["have"] = tactic.branch
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elif isinstance(tactic, TacticCalc):
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args["calc"] = tactic.step
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else:
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raise RuntimeError(f"Invalid tactic type: {tactic}")
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result = self.run('goal.tactic', args)
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if "error" in result:
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raise ServerError(result["desc"])
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if "tacticErrors" in result:
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raise ServerError(result["tacticErrors"])
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if "parseError" in result:
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raise ServerError(result["parseError"])
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return GoalState.parse(result, self.to_remove_goal_states)
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def goal_conv_begin(self, state: GoalState, goal_id: int) -> GoalState:
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result = self.run('goal.tactic', {"stateId": state.state_id, "goalId": goal_id, "conv": True})
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if "error" in result:
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raise ServerError(result["desc"])
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if "tacticErrors" in result:
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raise ServerError(result["tacticErrors"])
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if "parseError" in result:
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raise ServerError(result["parseError"])
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return GoalState.parse(result, self.to_remove_goal_states)
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def goal_conv_end(self, state: GoalState) -> GoalState:
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result = self.run('goal.tactic', {"stateId": state.state_id, "goalId": 0, "conv": False})
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if "error" in result:
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raise ServerError(result["desc"])
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if "tacticErrors" in result:
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raise ServerError(result["tacticErrors"])
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if "parseError" in result:
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raise ServerError(result["parseError"])
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return GoalState.parse(result, self.to_remove_goal_states)
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def compile_tactics(self, module: str) -> list[tuple[str, str, str]]:
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result = self.run('compile.tactics', {'module': module})
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if "error" in result:
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raise ServerError(result["desc"])
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return [(i['goalBefore'], i['tactic'], i['goalAfter']) for i in result['invocations']]
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def get_version():
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import subprocess
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with subprocess.Popen([_get_proc_path(), "--version"],
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stdout=subprocess.PIPE,
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cwd=_get_proc_cwd()) as p:
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return p.communicate()[0].decode('utf-8').strip()
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class TestServer(unittest.TestCase):
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def test_version(self):
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self.assertEqual(get_version(), "0.2.15")
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def test_expr_type(self):
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server = Server()
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t = server.expr_type("forall (n m: Nat), n + m = m + n")
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self.assertEqual(t, "Prop")
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def test_goal_start(self):
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server = Server()
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state0 = server.goal_start("forall (p q: Prop), Or p q -> Or q p")
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self.assertEqual(len(server.to_remove_goal_states), 0)
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self.assertEqual(state0.state_id, 0)
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state1 = server.goal_tactic(state0, goal_id=0, tactic="intro a")
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self.assertEqual(state1.state_id, 1)
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self.assertEqual(state1.goals, [Goal(
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variables=[Variable(name="a", t="Prop")],
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target="∀ (q : Prop), a ∨ q → q ∨ a",
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name=None,
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)])
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self.assertEqual(str(state1.goals[0]),"a : Prop\n⊢ ∀ (q : Prop), a ∨ q → q ∨ a")
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del state0
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self.assertEqual(len(server.to_remove_goal_states), 1)
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server.gc()
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self.assertEqual(len(server.to_remove_goal_states), 0)
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state0b = server.goal_start("forall (p: Prop), p -> p")
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del state0b
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self.assertEqual(len(server.to_remove_goal_states), 1)
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server.gc()
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self.assertEqual(len(server.to_remove_goal_states), 0)
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def test_conv_calc(self):
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server = Server()
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state0 = server.goal_start("∀ (a b: Nat), (b = 2) -> 1 + a + 1 = a + b")
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variables = [
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Variable(name="a", t="Nat"),
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Variable(name="b", t="Nat"),
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Variable(name="h", t="b = 2"),
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]
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state1 = server.goal_tactic(state0, goal_id=0, tactic="intro a b h")
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state2 = server.goal_tactic(state1, goal_id=0, tactic=TacticCalc("1 + a + 1 = a + 1 + 1"))
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self.assertEqual(state2.goals, [
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Goal(
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variables,
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target="1 + a + 1 = a + 1 + 1",
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name='calc',
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),
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Goal(
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variables,
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target="a + 1 + 1 = a + b",
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),
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])
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state_c1 = server.goal_conv_begin(state2, goal_id=0)
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state_c2 = server.goal_tactic(state_c1, goal_id=0, tactic="rhs")
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state_c3 = server.goal_tactic(state_c2, goal_id=0, tactic="rw [Nat.add_comm]")
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state_c4 = server.goal_conv_end(state_c3)
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state_c5 = server.goal_tactic(state_c4, goal_id=0, tactic="rfl")
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self.assertTrue(state_c5.is_solved)
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state3 = server.goal_tactic(state2, goal_id=1, tactic=TacticCalc("_ = a + 2"))
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state4 = server.goal_tactic(state3, goal_id=0, tactic="rw [Nat.add_assoc]")
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self.assertTrue(state4.is_solved)
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if __name__ == '__main__':
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unittest.main()
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