59 lines
1.8 KiB
Plaintext
59 lines
1.8 KiB
Plaintext
/-
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Copyright (c) 2022 Henrik Böving. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Henrik Böving
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-/
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import Lean
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import DocGen4.Process.Base
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import DocGen4.Process.NameInfo
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namespace DocGen4.Process
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open Lean Meta
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-- TODO: replace with Leos variant from Zulip
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def dropArgs (type : Expr) (n : Nat) : (Expr × List (Name × Expr)) :=
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match type, n with
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| e, 0 => (e, [])
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| Expr.forallE name type body _, x + 1 =>
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let body := body.instantiate1 <| mkFVar ⟨name⟩
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let next := dropArgs body x
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{ next with snd := (name, type) :: next.snd}
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| _, _ + 1 => panic! s!"No forallE left"
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def getFieldTypes (struct : Name) (ctor : ConstructorVal) (parents : Nat) : MetaM (Array NameInfo) := do
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let type := ctor.type
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let (fieldFunction, _) := dropArgs type (ctor.numParams + parents)
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let (_, fields) := dropArgs fieldFunction (ctor.numFields - parents)
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let mut fieldInfos := #[]
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for (name, type) in fields do
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fieldInfos := fieldInfos.push <| ← NameInfo.ofTypedName (struct.append name) type
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return fieldInfos
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def StructureInfo.ofInductiveVal (v : InductiveVal) : MetaM StructureInfo := do
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let info ← Info.ofConstantVal v.toConstantVal
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let env ← getEnv
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let parents := getParentStructures env v.name
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let ctorVal := getStructureCtor env v.name
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let ctor ← NameInfo.ofTypedName ctorVal.name ctorVal.type
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match getStructureInfo? env v.name with
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| some i =>
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if i.fieldNames.size - parents.size > 0 then
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return {
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toInfo := info,
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fieldInfo := ← getFieldTypes v.name ctorVal parents.size,
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parents,
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ctor
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}
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else
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return {
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toInfo := info,
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fieldInfo := #[],
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parents,
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ctor
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}
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| none => panic! s!"{v.name} is not a structure"
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end DocGen4.Process
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