import Lean namespace DocGen4 open Lean Meta -- The following is probably completely overengineered but I love it /-- Captures the notion of a value based attributes, `attrKind` is things like `EnumAttributes`. -/ class ValueAttr (attrKind : Type → Type) where /-- Given a certain value based attribute, an `Environment` and the `Name` of a declaration returns the value of the attribute on this declaration if present. -/ getValue {α : Type} [Inhabited α] [ToString α] : attrKind α → Environment → Name → Option String /-- Contains a specific attribute declaration of a certain attribute kind (enum based, parametric etc.). -/ structure ValueAttrWrapper (attrKind : Type → Type) [ValueAttr attrKind] where {α : Type} attr : attrKind α [str : ToString α] [inhab : Inhabited α] /-- Obtain the value of an enum attribute for a certain name. -/ def enumGetValue {α : Type} [Inhabited α] [ToString α] (attr : EnumAttributes α) (env : Environment) (decl : Name) : Option String := do let val ← EnumAttributes.getValue attr env decl some (toString val) instance : ValueAttr EnumAttributes where getValue := enumGetValue /-- Obtain the value of a parametric attribute for a certain name. -/ def parametricGetValue {α : Type} [Inhabited α] [ToString α] (attr : ParametricAttribute α) (env : Environment) (decl : Name) : Option String := do let val ← ParametricAttribute.getParam? attr env decl some (attr.attr.name.toString ++ " " ++ toString val) instance : ValueAttr ParametricAttribute where getValue := parametricGetValue abbrev EnumAttrWrapper := ValueAttrWrapper EnumAttributes abbrev ParametricAttrWrapper := ValueAttrWrapper ParametricAttribute /-- The list of all tag based attributes doc-gen knows about and can recover. -/ def tagAttributes : Array TagAttribute := #[IR.UnboxResult.unboxAttr, neverExtractAttr, Elab.Term.elabWithoutExpectedTypeAttr, SynthInstance.inferTCGoalsRLAttr, matchPatternAttr] deriving instance Repr for Compiler.InlineAttributeKind deriving instance Repr for Compiler.SpecializeAttributeKind open Compiler in instance : ToString InlineAttributeKind where toString kind := match kind with | InlineAttributeKind.inline => "inline" | InlineAttributeKind.noinline => "noinline" | InlineAttributeKind.macroInline => "macroInline" | InlineAttributeKind.inlineIfReduce => "inlineIfReduce" open Compiler in instance : ToString SpecializeAttributeKind where toString kind := match kind with | SpecializeAttributeKind.specialize => "specialize" | SpecializeAttributeKind.nospecialize => "nospecialize" /-- The list of all enum based attributes doc-gen knows about and can recover. -/ def enumAttributes : Array EnumAttrWrapper := #[⟨Compiler.inlineAttrs⟩, ⟨Compiler.specializeAttrs⟩] instance : ToString ExternEntry where toString entry := match entry with | ExternEntry.adhoc `all => "" | ExternEntry.adhoc backend => s!"{backend} adhoc" | ExternEntry.standard `all fn => fn | ExternEntry.standard backend fn => s!"{backend} {fn}" | ExternEntry.inline backend pattern => s!"{backend} inline {String.quote pattern}" -- TODO: The docs in the module dont specific how to render this | ExternEntry.foreign backend fn => s!"{backend} foreign {fn}" instance : ToString ExternAttrData where toString data := (data.arity?.map toString |>.getD "") ++ " " ++ String.intercalate " " (data.entries.map toString) /-- The list of all parametric attributes (that is, attributes with any kind of information attached) doc-gen knows about and can recover. -/ def parametricAttributes : Array ParametricAttrWrapper := #[⟨externAttr⟩, ⟨Compiler.implementedByAttr⟩, ⟨exportAttr⟩] def getTags (decl : Name) : MetaM (Array String) := do let env ← getEnv pure <| tagAttributes.filter (TagAttribute.hasTag · env decl) |>.map (λ t => t.attr.name.toString) def getValuesAux {α : Type} {attrKind : Type → Type} [va : ValueAttr attrKind] [Inhabited α] [ToString α] (decl : Name) (attr : attrKind α) : MetaM (Option String) := do let env ← getEnv pure <| va.getValue attr env decl def getValues {attrKind : Type → Type} [ValueAttr attrKind] (decl : Name) (attrs : Array (ValueAttrWrapper attrKind)) : MetaM (Array String) := do let mut res := #[] for attr in attrs do if let some val ← @getValuesAux attr.α attrKind _ attr.inhab attr.str decl attr.attr then res := res.push val pure res def getEnumValues (decl : Name) : MetaM (Array String) := getValues decl enumAttributes def getParametricValues (decl : Name) : MetaM (Array String) := getValues decl parametricAttributes def getDefaultInstance (decl : Name) (className : Name) : MetaM (Option String) := do let insts ← getDefaultInstances className for (inst, prio) in insts do if inst == decl then return some s!"defaultInstance {prio}" pure none def hasSimp (decl : Name) : MetaM (Option String) := do let thms ← simpExtension.getTheorems pure <| if thms.isLemma decl then some "simp" else none def hasCsimp (decl : Name) : MetaM (Option String) := do let env ← getEnv pure <| if Compiler.hasCSimpAttribute env decl then some "csimp" else none /-- The list of custom attributes, that don't fit in the parametric or enum attribute kinds, doc-gen konws about and can recover. -/ def customAttrs := #[hasSimp, hasCsimp] def getCustomAttrs (decl : Name) : MetaM (Array String) := do let mut values := #[] for attr in customAttrs do if let some value ← attr decl then values := values.push value pure values /-- The main entry point for recovering all attribute values for a given declaration. -/ def getAllAttributes (decl : Name) : MetaM (Array String) := do let tags ← getTags decl let enums ← getEnumValues decl let parametric ← getParametricValues decl let customs ← getCustomAttrs decl pure <| customs ++ tags ++ enums ++ parametric end DocGen4