68 lines
1.8 KiB
Text
68 lines
1.8 KiB
Text
meta def mytac :=
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state_t nat tactic
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section
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local attribute [reducible] mytac
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meta instance : monad mytac := by apply_instance
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meta instance : monad_state_lift nat tactic mytac := by apply_instance
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meta instance : has_monad_lift tactic mytac := by apply_instance
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end
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meta instance (α : Type) : has_coe (tactic α) (mytac α) :=
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⟨monad_lift⟩
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namespace mytac
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meta def step {α : Type} (t : mytac α) : mytac unit :=
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t >> return ()
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meta def istep {α : Type} (line0 col0 line col : nat) (t : mytac α) : mytac unit :=
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⟨λ v s, result.cases_on (@scope_trace _ line col (λ_, t.run v s))
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(λ ⟨a, v⟩ new_s, result.success ((), v) new_s)
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(λ opt_msg_thunk e new_s, match opt_msg_thunk with
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| some msg_thunk :=
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let msg := λ _ : unit, msg_thunk () ++ format.line ++ to_fmt "value: " ++ to_fmt v ++ format.line ++ to_fmt "state:" ++ format.line ++ new_s^.to_format in
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interaction_monad.result.exception (some msg) (some ⟨line, col⟩) new_s
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| none := interaction_monad.silent_fail new_s
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end)⟩
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meta def execute (tac : mytac unit) : tactic unit :=
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tac.run 0 >> return ()
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meta def save_info (p : pos) : mytac unit :=
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do v ← get,
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s ← tactic.read,
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tactic.save_info_thunk p
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(λ _, to_fmt "Custom state: " ++ to_fmt v ++ format.line ++
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tactic_state.to_format s)
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namespace interactive
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meta def intros : mytac unit :=
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tactic.intros >> return ()
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meta def constructor : mytac unit :=
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tactic.constructor >> return ()
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meta def trace (s : string) : mytac unit :=
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tactic.trace s
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meta def assumption : mytac unit :=
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tactic.assumption
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meta def inc : mytac punit :=
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modify (+1)
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end interactive
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end mytac
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example (p q : Prop) : p → q → p ∧ q :=
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begin [mytac]
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intros,
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inc,
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trace "test",
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constructor,
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inc,
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assumption,
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--^ "command": "info"
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assumption
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end
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