X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/6ee1970906d33f0b1b2be20e2f8a4521a6ca514f..2c0aab07cc749aacc29c485f85537e0f0a3c9536:/src/pset-proto.lisp

diff --git a/src/pset-proto.lisp b/src/pset-proto.lisp
index e16e04c..2620585 100644
--- a/src/pset-proto.lisp
+++ b/src/pset-proto.lisp
@@ -86,52 +86,6 @@
 		    :location (file-location location)
 		    :seenp seenp)))
 
-(defun string-to-symbol
-    (string &key (package *package*) (swap-case t) (swap-hyphen t))
-  "Convert STRING to a symbol in PACKAGE.
-
-   Parse off a `PACKAGE:' prefix from STRING if necessary, to identify the
-   package; PACKAGE is used if there isn't a prefix.  A doubled colon allows
-   access to internal symbols, and will intern if necessary.  Note that
-   escape characters are /not/ processed; don't put colons in package names
-   if you want to use them from SOD property sets.
-
-   The portions of the string are modified by `frob-identifier'; the
-   arguments SWAP-CASE and SWAP-HYPHEN are passed to `frob-identifier' to
-   control this process."
-
-  (let* ((length (length string))
-	 (colon (position #\: string)))
-    (multiple-value-bind (start internalp)
-	(cond ((not colon) (values 0 t))
-	      ((and (< (1+ colon) length)
-		    (char= (char string (1+ colon)) #\:))
-	       (values (+ colon 2) t))
-	      (t
-	       (values (1+ colon) nil)))
-      (when colon
-	(let* ((package-name (if (zerop colon) "KEYWORD"
-				 (frob-identifier (subseq string 0 colon)
-						  :swap-case swap-case
-						  :swap-hyphen swap-hyphen)))
-	       (found (find-package package-name)))
-	  (unless found
-	    (error "Unknown package `~A'" package-name))
-	  (setf package found)))
-      (let ((name (frob-identifier (subseq string start)
-				   :swap-case swap-case
-				   :swap-hyphen swap-hyphen)))
-	(multiple-value-bind (symbol status)
-	    (funcall (if internalp #'intern #'find-symbol) name package)
-	  (cond ((or internalp (eq status :external))
-		 symbol)
-		((not status)
-		 (error "Symbol `~A' not found in package `~A'"
-			name (package-name package)))
-		(t
-		 (error "Symbol `~A' not external in package `~A'"
-			name (package-name package)))))))))
-
 (export 'coerce-property-value)
 (defgeneric coerce-property-value (value type wanted)
   (:documentation
@@ -306,6 +260,7 @@
 ;;;--------------------------------------------------------------------------
 ;;; Utility macros.
 
+(export 'default-slot-from-property)
 (defmacro default-slot-from-property
     ((instance slot &optional (slot-names t))
      (pset property type
@@ -317,7 +272,8 @@
    We initialize SLOT in INSTANCE.  In full: if PSET contains a property
    called NAME, then convert it to TYPE, bind the value to PVAR and evaluate
    CONVERT-FORMS -- these default to just using the property value.  If
-   there's no property, and the slot is named in SLOT-NAMES and currently
+   there's no property, and DEFAULT-FORMS contains at least one non-
+   declaration form, and the slot is named in SLOT-NAMES and currently
    unbound, then evaluate DEFAULT-FORMS and use their value to compute the
    slot value."
 
@@ -333,7 +289,8 @@
 	       (setf (slot-value ,instance ,slot)
 		     (with-default-error-location (,floc)
 		       ,@(or convert-forms `(,pvar))))
-	       (default-slot (,instance ,slot ,slot-names)
-		 ,@body)))))))
+	       ,@(and body
+		      `((default-slot (,instance ,slot ,slot-names)
+			  ,@body)))))))))
 
 ;;;----- That's all, folks --------------------------------------------------