From bd401036e892b07e7f4c1a4ee41d0a30364385e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Sun, 12 Jul 2020 23:08:10 +0200
Subject: Add initial (sxml namespace).

---
 module/sxml/namespace.scm | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 module/sxml/namespace.scm

diff --git a/module/sxml/namespace.scm b/module/sxml/namespace.scm
new file mode 100644
index 00000000..4e364cad
--- /dev/null
+++ b/module/sxml/namespace.scm
@@ -0,0 +1,39 @@
+(define-module (sxml namespace)
+  :use-module (util)
+  :use-module (sxml transform))
+
+(define* (symbol-split symbol key: (sep #\:))
+  (->> (-> symbol
+           symbol->string
+           (string-split sep))
+       (map string->symbol)
+       (apply values)))
+
+(define (string-last string)
+  (string-ref string (1- (string-length string))))
+
+;; sxml, (U symbol string #f) → sxml
+;; NOTE possibly allow namespace to be a map between namespaces
+(define-public (move-to-namespace sxml namespace)
+
+  (define nssymb
+    (cond
+     [(not namespace) '#{}#]
+     [(symbol? namespace)
+      (if (char=? #\: (string-last (symbol->string namespace)))
+          namespace (symbol-append namespace ':))]
+     [(string? namespace)
+      (if (char=? #\: (string-last namespace))
+          (string->symbol namespace)
+          (string->symbol (string-append namespace ":")))]))
+
+  (define (ns tag)
+    (call-with-values (lambda () (symbol-split tag))
+      (case-lambda
+        [(ns tag) (symbol-append nssymb tag)]
+        [(tag) (symbol-append nssymb tag)])))
+
+  (pre-post-order
+   sxml
+   `((*TOP* . ,list) (*PI* . ,list) (*text* . ,(lambda (tag text) text))
+     (*default* . ,(lambda (tag . body) `(,(ns tag) . ,body))))))
-- 
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