84 lines
2.4 KiB
Text
84 lines
2.4 KiB
Text
/-
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Copyright (c) 2018 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Sebastian Ullrich
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-/
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prelude
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import init.lean.format init.data.rbmap init.lean.position init.lean.name init.lean.options
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universe u
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namespace lean
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inductive message
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| from_format (fmt : format)
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instance : has_coe format message :=
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⟨message.from_format⟩
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inductive trace
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| mk (msg : message) (subtraces : list trace)
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def trace.pp : trace → format
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| (trace.mk (message.from_format fmt) subtraces) :=
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fmt ++ format.nest 2 (format.join $ subtraces.map (λ t, format.line ++ t.pp))
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namespace trace
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def trace_map := rbmap position trace (<)
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structure trace_state :=
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(opts : options)
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(roots : trace_map)
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(cur_pos : option position)
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(cur_traces : list trace)
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def trace_t (m : Type → Type u) := state_t trace_state m
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local attribute [reducible] trace_t
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instance (m) [monad m] : monad (trace_t m) := infer_instance
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class monad_tracer (m : Type → Type u) :=
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(trace_root {α} : position → name → message → thunk (m α) → m α)
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(trace_ctx {α} : name → message → thunk (m α) → m α)
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export monad_tracer (trace_root trace_ctx)
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def trace {m} [monad m] [monad_tracer m] (cls : name) (msg : message) : m unit :=
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trace_ctx cls msg (pure () : m unit)
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instance (m) [monad m] : monad_tracer (trace_t m) :=
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{ trace_root := λ α pos cls msg ctx, do {
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st ← get,
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if st.opts.get_bool cls = some tt then do {
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modify $ λ st, {cur_pos := pos, cur_traces := [], ..st},
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a ← ctx.get,
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modify $ λ (st : trace_state), {roots := st.roots.insert pos ⟨msg, st.cur_traces⟩, ..st},
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pure a
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} else ctx.get
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},
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trace_ctx := λ α cls msg ctx, do {
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st ← get,
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-- tracing enabled?
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some _ ← pure st.cur_pos | ctx.get,
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-- trace class enabled?
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if st.opts.get_bool cls = some tt then do {
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put {cur_traces := [], ..st},
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a ← ctx.get,
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modify $ λ (st' : trace_state), {cur_traces := st.cur_traces ++ [⟨msg, st'.cur_traces⟩], ..st'},
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pure a
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} else
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-- disable tracing inside 'ctx'
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adapt_state'
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(λ _, {cur_pos := none, ..st})
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(λ st', {cur_pos := st.cur_pos, ..st'})
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ctx.get
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}
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}
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meta def trace_t.run {m α} [monad m] (opts : options) (x : trace_t m α) : m (α × trace_map) :=
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do (a, st) ← state_t.run x {opts := opts, roots := mk_rbmap _ _ _, cur_pos := none, cur_traces := []},
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pure (a, st.roots)
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end trace
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end lean
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