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ScopedEnvExtension.lean
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ScopedEnvExtension.lean
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/-
Copyright (c) 2020 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Leonardo de Moura
-/
prelude
import Lean.Environment
import Lean.Data.NameTrie
import Lean.Attributes
namespace Lean
namespace ScopedEnvExtension
inductive Entry (α : Type) where
| global : α → Entry α
| scoped : Name → α → Entry α
structure State (σ : Type) where
state : σ
activeScopes : NameSet := {}
structure ScopedEntries (β : Type) where
map : SMap Name (PArray β) := {}
deriving Inhabited
structure StateStack (α : Type) (β : Type) (σ : Type) where
stateStack : List (State σ) := {}
scopedEntries : ScopedEntries β := {}
newEntries : List (Entry α) := []
deriving Inhabited
structure Descr (α : Type) (β : Type) (σ : Type) where
name : Name := by exact decl_name%
mkInitial : IO σ
ofOLeanEntry : σ → α → ImportM β
toOLeanEntry : β → α
addEntry : σ → β → σ
finalizeImport : σ → σ := id
instance [Inhabited α] : Inhabited (Descr α β σ) where
default := {
name := default
mkInitial := default
ofOLeanEntry := default
toOLeanEntry := default
addEntry := fun s _ => s
}
def mkInitial (descr : Descr α β σ) : IO (StateStack α β σ) :=
return { stateStack := [ { state := (← descr.mkInitial ) } ] }
def ScopedEntries.insert (scopedEntries : ScopedEntries β) (ns : Name) (b : β) : ScopedEntries β :=
match scopedEntries.map.find? ns with
| none => { map := scopedEntries.map.insert ns <| ({} : PArray β).push b }
| some bs => { map := scopedEntries.map.insert ns <| bs.push b }
def addImportedFn (descr : Descr α β σ) (as : Array (Array (Entry α))) : ImportM (StateStack α β σ) := do
let mut s ← descr.mkInitial
let mut scopedEntries : ScopedEntries β := {}
for a in as do
for e in a do
match e with
| Entry.global a =>
let b ← descr.ofOLeanEntry s a
s := descr.addEntry s b
| Entry.scoped ns a =>
let b ← descr.ofOLeanEntry s a
scopedEntries := scopedEntries.insert ns b
s := descr.finalizeImport s
return { stateStack := [ { state := s } ], scopedEntries := scopedEntries }
def addEntryFn (descr : Descr α β σ) (s : StateStack α β σ) (e : Entry β) : StateStack α β σ :=
match s with
| { stateStack := stateStack, scopedEntries := scopedEntries, newEntries := newEntries } =>
match e with
| Entry.global b => {
scopedEntries := scopedEntries
newEntries := (Entry.global (descr.toOLeanEntry b)) :: newEntries
stateStack := stateStack.map fun s => { s with state := descr.addEntry s.state b }
}
| Entry.«scoped» ns b =>
{
scopedEntries := scopedEntries.insert ns b
newEntries := (Entry.«scoped» ns (descr.toOLeanEntry b)) :: newEntries
stateStack := stateStack.map fun s =>
if s.activeScopes.contains ns then
{ s with state := descr.addEntry s.state b }
else
s
}
def exportEntriesFn (s : StateStack α β σ) : Array (Entry α) :=
s.newEntries.toArray.reverse
end ScopedEnvExtension
open ScopedEnvExtension
structure ScopedEnvExtension (α : Type) (β : Type) (σ : Type) where
descr : Descr α β σ
ext : PersistentEnvExtension (Entry α) (Entry β) (StateStack α β σ)
deriving Inhabited
builtin_initialize scopedEnvExtensionsRef : IO.Ref (Array (ScopedEnvExtension EnvExtensionEntry EnvExtensionEntry EnvExtensionState)) ← IO.mkRef #[]
unsafe def registerScopedEnvExtensionUnsafe (descr : Descr α β σ) : IO (ScopedEnvExtension α β σ) := do
let ext ← registerPersistentEnvExtension {
name := descr.name
mkInitial := mkInitial descr
addImportedFn := addImportedFn descr
addEntryFn := addEntryFn descr
exportEntriesFn := exportEntriesFn
statsFn := fun s => format "number of local entries: " ++ format s.newEntries.length
}
let ext := { descr := descr, ext := ext : ScopedEnvExtension α β σ }
scopedEnvExtensionsRef.modify fun exts => exts.push (unsafeCast ext)
return ext
@[implemented_by registerScopedEnvExtensionUnsafe]
opaque registerScopedEnvExtension (descr : Descr α β σ) : IO (ScopedEnvExtension α β σ)
def ScopedEnvExtension.pushScope (ext : ScopedEnvExtension α β σ) (env : Environment) : Environment :=
let s := ext.ext.getState env
match s.stateStack with
| [] => env
| state :: stack => ext.ext.setState env { s with stateStack := state :: state :: stack }
def ScopedEnvExtension.popScope (ext : ScopedEnvExtension α β σ) (env : Environment) : Environment :=
let s := ext.ext.getState env
match s.stateStack with
| _ :: state₂ :: stack => ext.ext.setState env { s with stateStack := state₂ :: stack }
| _ => env
def ScopedEnvExtension.addEntry (ext : ScopedEnvExtension α β σ) (env : Environment) (b : β) : Environment :=
ext.ext.addEntry env (Entry.global b)
def ScopedEnvExtension.addScopedEntry (ext : ScopedEnvExtension α β σ) (env : Environment) (namespaceName : Name) (b : β) : Environment :=
ext.ext.addEntry env (Entry.«scoped» namespaceName b)
def ScopedEnvExtension.addLocalEntry (ext : ScopedEnvExtension α β σ) (env : Environment) (b : β) : Environment :=
let s := ext.ext.getState env
match s.stateStack with
| [] => env
| top :: states =>
let top := { top with state := ext.descr.addEntry top.state b }
ext.ext.setState env { s with stateStack := top :: states }
def ScopedEnvExtension.addCore (env : Environment) (ext : ScopedEnvExtension α β σ) (b : β) (kind : AttributeKind) (namespaceName : Name) : Environment :=
match kind with
| AttributeKind.global => ext.addEntry env b
| AttributeKind.local => ext.addLocalEntry env b
| AttributeKind.scoped => ext.addScopedEntry env namespaceName b
def ScopedEnvExtension.add [Monad m] [MonadResolveName m] [MonadEnv m] (ext : ScopedEnvExtension α β σ) (b : β) (kind := AttributeKind.global) : m Unit := do
let ns ← getCurrNamespace
modifyEnv (ext.addCore · b kind ns)
def ScopedEnvExtension.getState [Inhabited σ] (ext : ScopedEnvExtension α β σ) (env : Environment) : σ :=
match ext.ext.getState env |>.stateStack with
| top :: _ => top.state
| _ => unreachable!
def ScopedEnvExtension.activateScoped (ext : ScopedEnvExtension α β σ) (env : Environment) (namespaceName : Name) : Environment :=
let s := ext.ext.getState env
match s.stateStack with
| top :: stack =>
if top.activeScopes.contains namespaceName then
env
else
let activeScopes := top.activeScopes.insert namespaceName
let top :=
match s.scopedEntries.map.find? namespaceName with
| none =>
{ top with activeScopes := activeScopes }
| some bs => Id.run do
let mut state := top.state
for b in bs do
state := ext.descr.addEntry state b
{ state := state, activeScopes := activeScopes }
ext.ext.setState env { s with stateStack := top :: stack }
| _ => env
def ScopedEnvExtension.modifyState (ext : ScopedEnvExtension α β σ) (env : Environment) (f : σ → σ) : Environment :=
let s := ext.ext.getState env
match s.stateStack with
| top :: stack => ext.ext.setState env { s with stateStack := { top with state := f top.state } :: stack }
| _ => env
def pushScope [Monad m] [MonadEnv m] [MonadLiftT (ST IO.RealWorld) m] : m Unit := do
for ext in (← scopedEnvExtensionsRef.get) do
modifyEnv ext.pushScope
def popScope [Monad m] [MonadEnv m] [MonadLiftT (ST IO.RealWorld) m] : m Unit := do
for ext in (← scopedEnvExtensionsRef.get) do
modifyEnv ext.popScope
def activateScoped [Monad m] [MonadEnv m] [MonadLiftT (ST IO.RealWorld) m] (namespaceName : Name) : m Unit := do
for ext in (← scopedEnvExtensionsRef.get) do
modifyEnv (ext.activateScoped · namespaceName)
abbrev SimpleScopedEnvExtension (α : Type) (σ : Type) := ScopedEnvExtension α α σ
structure SimpleScopedEnvExtension.Descr (α : Type) (σ : Type) where
name : Name := by exact decl_name%
addEntry : σ → α → σ
initial : σ
finalizeImport : σ → σ := id
def registerSimpleScopedEnvExtension (descr : SimpleScopedEnvExtension.Descr α σ) : IO (SimpleScopedEnvExtension α σ) := do
registerScopedEnvExtension {
name := descr.name
mkInitial := return descr.initial
addEntry := descr.addEntry
toOLeanEntry := id
ofOLeanEntry := fun _ a => return a
finalizeImport := descr.finalizeImport
}
end Lean