X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/e0808c472145fc81e52898bc9ac289e10c4f4f41..6c3c2dd3e236da72ce43b923e4eeac7d33eb5cbd:/src/pset-impl.lisp

diff --git a/src/pset-impl.lisp b/src/pset-impl.lisp
index e3e505f..e6986a5 100644
--- a/src/pset-impl.lisp
+++ b/src/pset-impl.lisp
@@ -26,6 +26,63 @@
 (cl:in-package #:sod)
 
 ;;;--------------------------------------------------------------------------
+;;; Conversion utilities.
+
+(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)))))))))
+
+(let ((truish '("true" "t" "yes" "verily"))
+      (falsish '("false" "nil" "no" "nowise")))
+  (defun truishp (string)
+    "Convert STRING to a boolean."
+    (cond ((member string truish :test #'string=) t)
+	  ((member string falsish :test #'string=) nil)
+	  (t (error "Unrecognized boolean value `~A'" string)))))
+
+;;;--------------------------------------------------------------------------
 ;;; Property representation.
 
 (defmethod file-location ((prop property))
@@ -65,6 +122,29 @@
     ((value symbol) (type (eql :symbol)) (wanted (eql :id)))
   (frob-identifier (symbol-name value)))
 
+;;; Boolean.
+
+(defmethod coerce-property-value
+    ((value symbol) (type (eql :symbol)) (wanted (eql :boolean)))
+  value)
+
+(defmethod coerce-property-value
+    ((value string) (type (eql :id)) (wanted (eql :boolean)))
+  (truishp value))
+
+(defmethod coerce-property-value
+    ((value integer) (type (eql :int)) (wanted (eql :boolean)))
+  (not (zerop value)))
+
+;;; Types.
+
+(defmethod coerce-property-value
+    ((value string) (type (eql :id)) (wanted (eql :type)))
+  (or (and (boundp '*module-type-map*)
+	   (gethash value *module-type-map*))
+      (find-simple-c-type value)
+      (error "Unknown type `~A'" value)))
+
 ;;;--------------------------------------------------------------------------
 ;;; Property sets.