From: Han-Wen Nienhuys <hanwen@xs4all.nl>
Date: Sat, 28 Sep 2002 16:18:19 +0000 (+0000)
Subject: new file
X-Git-Tag: release/1.7.1~2
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=b13fd24fb3933c220c97f085ce731dce425d5917;p=lilypond.git

new file
---

diff --git a/scm/to-xml.scm b/scm/to-xml.scm
new file mode 100644
index 0000000000..105d93bb75
--- /dev/null
+++ b/scm/to-xml.scm
@@ -0,0 +1,106 @@
+
+
+"
+
+
+Todo: this is a quick hack; it makes more sense to define a GOOPS
+class of a documentnode (similar to how
+; the documentation is generated.)
+
+That is much cleaner: building the document, and dumping it to output
+is then separated.
+
+"
+
+(define (dump-duration d port)
+ (display (open-tag "duration"
+	    `((log . ,(duration-log d))
+	      (dots . ,(duration-dot-count d))
+	      (numer . ,(car (duration-factor d)))
+	      (denom . ,(cdr (duration-factor d)))
+	      )
+	    '() ) port)
+ (display  (close-tag 'duration) port))
+
+(define (dump-pitch p port)
+ (display (open-tag "pitch"
+	    `((octave . ,(pitch-octave p))
+	      (notename . ,(pitch-notename p))
+	      (alteration . ,(pitch-alteration p))
+	      )
+	    '() ) port)
+ (display  (close-tag 'pitch) port))
+
+;; should use macro
+(define (assert x)
+  (if x
+      #t
+      (error "assertion failed")))
+
+(define (open-tag tag attrs exceptions)
+  (define (candidate? x)
+    (not (memq (car x) exceptions)))
+  
+  (define (dump-attr sym-val)
+    (let*
+	(
+	(sym (car sym-val))
+	(val (cdr sym-val))
+	)
+      
+    (string-append
+     "\n   "
+    (symbol->string sym)
+    "=\""
+    
+    (call-with-output-string (lambda (port) (display val port)))
+    "\""
+    )))
+
+  (string-append
+   "<" tag
+   (apply string-append
+	  (map dump-attr (filter-list candidate? attrs)))
+
+   ">\n")
+   
+  )
+(define (close-tag name)
+  (string-append "</" (symbol->string name) ">\n")
+  )
+
+(define-public (music-to-xml music port)
+  "Dump XML-ish stuff to PORT."
+   (let*
+       (
+	(name (ly-get-mus-property music 'name))
+	(e (ly-get-mus-property music 'element))
+	(es (ly-get-mus-property music 'elements))
+	(mprops (ly-get-mutable-properties music))
+	(p (ly-get-mus-property music 'pitch))
+	(d (ly-get-mus-property music 'duration))
+	(ignore-props '(origin elements duration pitch element))
+	)
+
+     (display (open-tag (symbol->string name) mprops ignore-props) port)
+     (if (duration? d)
+	 (dump-duration d port))
+     (if (pitch? p)
+	 (dump-pitch p port))
+     (if (pair? es)
+	 (begin
+	   (display "<elements>" port)
+	   (map (lambda (x) (music-to-xml x port)) es)
+	   (display "</elements>" port)
+	   ))
+
+     (if (music? e)
+	 (begin
+	   (display "<element>" port)
+	   (music-to-xml e port)
+	   (display "</element>" port)
+	   ))
+     (display (close-tag name) port)
+   ))
+   
+