""" Class which manages a Pantograph instance. All calls to the kernel uses this interface. """ import json, pexpect, pathlib, unittest, os from pantograph.expr import parse_expr, Expr, Variable, Goal, GoalState, \ Tactic, TacticHave, TacticCalc from pantograph.compiler import TacticInvocation def _get_proc_cwd(): return pathlib.Path(__file__).parent def _get_proc_path(): return _get_proc_cwd() / "pantograph" class ServerError(Exception): pass class Server: def __init__(self, imports=["Init"], project_path=None, lean_path=None, options=[], timeout=20, maxread=1000000): """ timeout: Amount of time to wait for execution maxread: Maximum number of characters to read (especially important for large proofs and catalogs) """ self.timeout = timeout self.imports = imports self.project_path = project_path if project_path else _get_proc_cwd() self.lean_path = lean_path self.maxread = maxread self.proc_path = _get_proc_path() self.options = options self.args = " ".join(imports + [f'--{opt}' for opt in options]) self.proc = None self.restart() # List of goal states that should be garbage collected self.to_remove_goal_states = [] def restart(self): if self.proc is not None: self.proc.close() env = os.environ if self.lean_path: env = env | {'LEAN_PATH': self.lean_path} self.proc = pexpect.spawn( f"{self.proc_path} {self.args}", encoding="utf-8", maxread=self.maxread, cwd=self.project_path, env=env, ) self.proc.setecho(False) def run(self, cmd, payload): """ Runs a raw JSON command. Preferably use one of the commands below. """ s = json.dumps(payload) self.proc.sendline(f"{cmd} {s}") try: self.proc.expect("{.*}\r\n", timeout=self.timeout) output = self.proc.match.group() return json.loads(output) except pexpect.exceptions.TIMEOUT as exc: raise exc def gc(self): """ Garbage collect deleted goal states. Must be called periodically. """ if self.to_remove_goal_states: self.run('goal.delete', {'stateIds': self.to_remove_goal_states}) self.to_remove_goal_states.clear() def expr_type(self, expr: str) -> Expr: """ Evaluate the type of a given expression. This gives an error if the input `expr` is ill-formed. """ result = self.run('expr.echo', {"expr": expr}) if "error" in result: raise ServerError(result["desc"]) return parse_expr(result["type"]) def goal_start(self, expr: str) -> GoalState: result = self.run('goal.start', {"expr": str(expr)}) if "error" in result: raise ServerError(result["desc"]) return GoalState(state_id=result["stateId"], goals=[Goal.sentence(expr)], _sentinel=self.to_remove_goal_states) def goal_tactic(self, state: GoalState, goal_id: int, tactic: Tactic) -> GoalState: args = {"stateId": state.state_id, "goalId": goal_id} if isinstance(tactic, str): args["tactic"] = tactic elif isinstance(tactic, TacticHave): args["have"] = tactic.branch elif isinstance(tactic, TacticCalc): args["calc"] = tactic.step else: raise RuntimeError(f"Invalid tactic type: {tactic}") result = self.run('goal.tactic', args) if "error" in result: raise ServerError(result["desc"]) if "tacticErrors" in result: raise ServerError(result["tacticErrors"]) if "parseError" in result: raise ServerError(result["parseError"]) return GoalState.parse(result, self.to_remove_goal_states) def goal_conv_begin(self, state: GoalState, goal_id: int) -> GoalState: result = self.run('goal.tactic', {"stateId": state.state_id, "goalId": goal_id, "conv": True}) if "error" in result: raise ServerError(result["desc"]) if "tacticErrors" in result: raise ServerError(result["tacticErrors"]) if "parseError" in result: raise ServerError(result["parseError"]) return GoalState.parse(result, self.to_remove_goal_states) def goal_conv_end(self, state: GoalState) -> GoalState: result = self.run('goal.tactic', {"stateId": state.state_id, "goalId": 0, "conv": False}) if "error" in result: raise ServerError(result["desc"]) if "tacticErrors" in result: raise ServerError(result["tacticErrors"]) if "parseError" in result: raise ServerError(result["parseError"]) return GoalState.parse(result, self.to_remove_goal_states) def compile_unit(self, module: str) -> tuple[list[str], list[TacticInvocation]]: file_path = self.project_path / (module.replace('.', '/') + '.lean') result = self.run('compile.unit', { 'module': module, 'compilationUnits': True, 'invocations': True }) if "error" in result: raise ServerError(result["desc"]) with open(file_path, 'rb') as f: content = f.read() units = [content[begin:end].decode('utf-8') for begin,end in result['units']] invocations = [TacticInvocation.parse(i) for i in result['invocations']] return units, invocations def get_version(): import subprocess with subprocess.Popen([_get_proc_path(), "--version"], stdout=subprocess.PIPE, cwd=_get_proc_cwd()) as p: return p.communicate()[0].decode('utf-8').strip() class TestServer(unittest.TestCase): def test_version(self): self.assertEqual(get_version(), "0.2.16") def test_expr_type(self): server = Server() t = server.expr_type("forall (n m: Nat), n + m = m + n") self.assertEqual(t, "Prop") def test_goal_start(self): server = Server() state0 = server.goal_start("forall (p q: Prop), Or p q -> Or q p") self.assertEqual(len(server.to_remove_goal_states), 0) self.assertEqual(state0.state_id, 0) state1 = server.goal_tactic(state0, goal_id=0, tactic="intro a") self.assertEqual(state1.state_id, 1) self.assertEqual(state1.goals, [Goal( variables=[Variable(name="a", t="Prop")], target="∀ (q : Prop), a ∨ q → q ∨ a", name=None, )]) self.assertEqual(str(state1.goals[0]),"a : Prop\n⊢ ∀ (q : Prop), a ∨ q → q ∨ a") del state0 self.assertEqual(len(server.to_remove_goal_states), 1) server.gc() self.assertEqual(len(server.to_remove_goal_states), 0) state0b = server.goal_start("forall (p: Prop), p -> p") del state0b self.assertEqual(len(server.to_remove_goal_states), 1) server.gc() self.assertEqual(len(server.to_remove_goal_states), 0) def test_conv_calc(self): server = Server() state0 = server.goal_start("∀ (a b: Nat), (b = 2) -> 1 + a + 1 = a + b") variables = [ Variable(name="a", t="Nat"), Variable(name="b", t="Nat"), Variable(name="h", t="b = 2"), ] state1 = server.goal_tactic(state0, goal_id=0, tactic="intro a b h") state2 = server.goal_tactic(state1, goal_id=0, tactic=TacticCalc("1 + a + 1 = a + 1 + 1")) self.assertEqual(state2.goals, [ Goal( variables, target="1 + a + 1 = a + 1 + 1", name='calc', ), Goal( variables, target="a + 1 + 1 = a + b", ), ]) state_c1 = server.goal_conv_begin(state2, goal_id=0) state_c2 = server.goal_tactic(state_c1, goal_id=0, tactic="rhs") state_c3 = server.goal_tactic(state_c2, goal_id=0, tactic="rw [Nat.add_comm]") state_c4 = server.goal_conv_end(state_c3) state_c5 = server.goal_tactic(state_c4, goal_id=0, tactic="rfl") self.assertTrue(state_c5.is_solved) state3 = server.goal_tactic(state2, goal_id=1, tactic=TacticCalc("_ = a + 2")) state4 = server.goal_tactic(state3, goal_id=0, tactic="rw [Nat.add_assoc]") self.assertTrue(state4.is_solved) if __name__ == '__main__': unittest.main()