54 lines
2.5 KiB
Text
54 lines
2.5 KiB
Text
/-
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Copyright (c) 2021 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: Leonardo de Moura
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-/
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import Lean.Elab.Syntax
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import Lean.Elab.AuxDef
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namespace Lean.Elab.Command
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open Lean.Syntax
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open Lean.Parser.Term hiding macroArg
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open Lean.Parser.Command
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/-
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Remark: `k` is the user provided kind with the current namespace included.
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Recall that syntax node kinds contain the current namespace.
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-/
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def elabMacroRulesAux (doc? : Option Syntax) (attrKind tk : Syntax) (k : SyntaxNodeKind) (alts : Array Syntax) : CommandElabM Syntax := do
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let alts ← alts.mapM fun alt => match alt with
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| `(matchAltExpr| | $pats,* => $rhs) => do
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let pat := pats.elemsAndSeps[0]
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if !pat.isQuot then
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throwUnsupportedSyntax
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let quoted := getQuotContent pat
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let k' := quoted.getKind
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if checkRuleKind k' k then
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pure alt
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else if k' == choiceKind then
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match quoted.getArgs.find? fun quotAlt => checkRuleKind quotAlt.getKind k with
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| none => throwErrorAt alt "invalid macro_rules alternative, expected syntax node kind '{k}'"
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| some quoted =>
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let pat := pat.setArg 1 quoted
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let pats := pats.elemsAndSeps.set! 0 pat
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`(matchAltExpr| | $pats,* => $rhs)
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else
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throwErrorAt alt "invalid macro_rules alternative, unexpected syntax node kind '{k'}'"
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| _ => throwUnsupportedSyntax
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`($[$doc?:docComment]? @[$attrKind:attrKind macro $(Lean.mkIdent k)]
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aux_def macroRules $(mkIdentFrom tk k) : Macro :=
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fun $alts:matchAlt* | _ => throw Lean.Macro.Exception.unsupportedSyntax)
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@[builtinCommandElab «macro_rules»] def elabMacroRules : CommandElab :=
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adaptExpander fun stx => match stx with
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| `($[$doc?:docComment]? $attrKind:attrKind macro_rules%$tk $alts:matchAlt*) =>
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expandNoKindMacroRulesAux alts "macro_rules" fun kind? alts =>
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`($[$doc?:docComment]? $attrKind:attrKind macro_rules%$tk $[(kind := $(mkIdent <$> kind?))]? $alts:matchAlt*)
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| `($[$doc?:docComment]? $attrKind:attrKind macro_rules%$tk (kind := $kind) | $x:ident => $rhs) =>
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`($[$doc?:docComment]? @[$attrKind:attrKind macro $kind]
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aux_def $(mkIdentFrom tk kind.getId) $kind : Macro := fun $x:ident => $rhs)
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| `($[$doc?:docComment]? $attrKind:attrKind macro_rules%$tk (kind := $kind) $alts:matchAlt*) =>
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do elabMacroRulesAux doc? attrKind tk (← resolveSyntaxKind kind.getId) alts
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| _ => throwUnsupportedSyntax
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end Lean.Elab.Command
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