From 5d935807303a0280abad3fa36dae6429c8be7fb0 Mon Sep 17 00:00:00 2001
From: David Aspinall
Date: Thu, 7 Dec 2000 12:40:44 +0000
Subject: Beginnings of pgip processing

---
 generic/pg-pgip.el | 117 +++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 110 insertions(+), 7 deletions(-)

diff --git a/generic/pg-pgip.el b/generic/pg-pgip.el
index 5f4107ad..cc80d5d9 100644
--- a/generic/pg-pgip.el
+++ b/generic/pg-pgip.el
@@ -8,18 +8,121 @@
 ;;
 ;; Proof General Kit uses PGIP, an XML-message protocol
 ;; for interactive proof.  This file contains functions 
-;; to process PGIP commands.
+;; to process PGIP commands sent from the proof assistant.
 ;;
 
 (defun pg-pgip-process-cmd (pgip) 
   "Process the command in PGIP, which should be parsed XML according to pg-xml-parse-*."
-  ;; blah blah
-  )
+  (while (pgip)
+    (let ((elt   (caar  pgip))
+	  (attrs (cdar  pgip)))
+      (cond 
+       ;; <pgip> 
+       ((eq elt 'pgip))			;; ignore pgip attributes for now
+       ;; <usespgml>
+       ((eq elt 'usespgml)
+	(message "Recieved usespgml message, version %s"
+		 (pg-pgip-get-version "usespgml" attrs)))
+       ;; <haspref>
+       ((eq elt 'haspref)
+	(pg-pgip-haspref attrs (cadr pgip))
+	(setq pgip (cdr pgip)))
+       ;; <prefval>
+       ((eq elt 'prefval)
+	)
+       ;; <idtable>
+       ((eq elt 'idtable)
+	)
+       ;; <addid>
+       ((eq elt 'addid)
+	)
+       ;; <delid>
+       ((eq elt 'delid)
+	)
+       ;; <menuadd>
+       ((eq elt 'menuadd)
+	)
+       ((eq elt 'menudel)
+	))
+      ;; Move on to next element
+      (setq pgip (cdr pgip)))))
+
+(defun pg-pgip-haspref (attrs)
+  "Issue a defpacustom from a <haspref> element with attributes ATTRS"
+  (let*
+      ((type	 (pg-pgip-get-type attrs))
+       (default  (or (pg-pgip-get-attr "haspref" "default" attrs t)
+		     ;; If no default is supplied, make one
+		     (pg-pgip-default-for type)))
+       (kind	 (intern
+		  (or 
+		   (pg-pgip-get-attr "haspref" "kind" attrs t)
+		   ;; Default to kind user
+		   "user")))
+       (name     (intern (pg-pgip-get-attr "haspref" "name")))
+       (subst    (pg-pgip-subst-for type))
+       (setting  (concat "<pgip><setpref name=\"" name "\">" subst "</setpref></pgip>")))
+    (eval
+     (list 'defpacustom name default 
+	   ;; FIXME: better docstring
+	   "Setting configured by <haspref> PGIP message"
+	   :type type
+	   :setting setting))))
+    
+(defun pg-pgip-default-for (type)
+  "Synthesize a default value for type TYPE."
+  (cond
+   ((eq type 'boolean) false)
+   ((eq type 'integer) 0)
+   ((eq type 'string)  "")
+   ((eq (car-safe type) 'choice)
+	(car-safe (cdr-safe type)))
+   (t
+    (error "pg-pgip-default-for: unrecognized type passed in"))))
+
+(defun pg-pgip-subst-for (type)
+  "Return a substitution string for type TYPE."
+  (cond
+   ((eq type 'boolean) "%b")
+   ((eq type 'integer) "%i")
+   (t "%s")))
+
+(defun pg-pgip-get-type (attrs)
+  "Extract and check type value from ATTRS.  Normalize to custom format."
+  (let ((rawtype (pg-pgip-get-attr "haspref" "type" attrs)))
+    (cond
+     ((string-match "choice(\\(.*\\))" rawtype)
+      (let* ((choiceslist (match-string 1 rawtype))
+	     (choices	  (split-string choiceslist "[ \f\t\n\r\v]*,[ \f\t\n\r\v]*")))
+	(list 'choice choices)))
+     ((equal rawtype "boolean")
+      'boolean)
+     ((equal rawtype "int")
+      'integer)
+     ((equal rawtype "nat")		;; nat treated as int 
+      'integer)
+     ((equal rawtype "string")
+      'string)
+     (t
+      (error "pg-pgip-get-type: unrecognized type %s" rawtype)))))
+    
+
+;; Auxiliary functions for parsing
+
+(defun pg-pgip-get-attr (elt attrnm attrs &optional optional)
+  (let ((vrs (assoc attrnm attrs)))
+    (if optional
+	vrs
+      (or vrs
+	  (error "Didn't find %s attribute in %s element" attrnm elt)))))
+
+(defun pg-pgip-get-version (elt attrs &optional optional)
+  (pg-pgip-get-attr elt "version"))
+
+
+      
+
 
-(defpacustom goals-limit  10
-  "Setting for maximum number of goals printed in Isabelle."
-  :type 'integer
-  :setting "<pgip><setpref name=\"goals_limit\">%i</setpref></pgip>")
 
 
 ;; End of `pg-pgip.el'
-- 
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