59 lines
1.9 KiB
Plaintext
59 lines
1.9 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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/--
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Execute `k` with an array containing pairs `(fieldName, fieldType)`.
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`k` is executed in an updated local context which contains local declarations for the `structName` parameters.
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-/
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def withFields (info : InductiveVal) (k : Array (Name × Expr) → MetaM α) (includeSubobjectFields : Bool := false) : MetaM α := do
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let structName := info.name
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let us := info.levelParams.map mkLevelParam
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forallTelescopeReducing info.type fun params _ =>
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withLocalDeclD `s (mkAppN (mkConst structName us) params) fun s => do
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let mut info := #[]
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for fieldName in getStructureFieldsFlattened (← getEnv) structName includeSubobjectFields do
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let proj ← mkProjection s fieldName
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info := info.push (fieldName, (← inferType proj))
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k info
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def getFieldTypes (v : InductiveVal) : MetaM (Array NameInfo) := do
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withFields v fun fields =>
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fields.foldlM (init := #[]) (fun acc (name, type) => do return acc.push (← NameInfo.ofTypedName (v.name.append name) type))
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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,
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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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