From bfe6c4cee8b5afcd4078af319ab6b96f6695408b Mon Sep 17 00:00:00 2001
From: Hannes Schulze <contact@haschu.me>
Date: Fri, 10 Apr 2026 12:34:02 +0200
Subject: update lean

---
 tools/Scanner/Xml/Basic.lean | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tools/Scanner/Xml/Basic.lean

(limited to 'tools/Scanner/Xml/Basic.lean')

diff --git a/tools/Scanner/Xml/Basic.lean b/tools/Scanner/Xml/Basic.lean
new file mode 100644
index 0000000..bf0ac55
--- /dev/null
+++ b/tools/Scanner/Xml/Basic.lean
@@ -0,0 +1,40 @@
+/-
+Copyright (c) 2021 Microsoft Corporation. All rights reserved.
+Released under Apache 2.0 license as described in the file LICENSE.
+Author: Dany Fabian
+-/
+import Std.Data.TreeMap.Basic
+import Init.Data.Ord.String
+
+namespace Lean
+namespace Xml
+
+@[expose] def Attributes := Std.TreeMap String String
+instance : ToString Attributes := ⟨λ as => as.foldl (λ s n v => s ++ s!" {n}=\"{v}\"") ""⟩
+
+mutual
+inductive Element
+| Element
+  (name : String)
+  (attributes : Attributes)
+  (content : Array Content)
+
+inductive Content
+| Element (element : Element)
+| Comment (comment : String)
+| Character (content : String)
+deriving Inhabited
+end
+
+mutual
+private partial def eToString : Element → String
+| Element.Element n a c => s!"<{n}{a}>{c.map cToString |>.foldl (· ++ ·) ""}</{n}>"
+
+private partial def cToString : Content → String
+| Content.Element e => eToString e
+| Content.Comment c => s!"<!--{c}-->"
+| Content.Character c => c
+
+end
+instance : ToString Element := ⟨private_decl% eToString⟩
+instance : ToString Content := ⟨private_decl% cToString⟩
-- 
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