Thu Dec  3 00:12:02 UTC 2009  pix@kepibu.org
  * Add sibling and adjacent combinators
diff -rN -u old-Oh, Ducks!/selectors.lisp new-Oh, Ducks!/selectors.lisp
--- old-Oh, Ducks!/selectors.lisp	2015-12-09 14:27:37.000000000 +0000
+++ new-Oh, Ducks!/selectors.lisp	2015-12-09 14:27:37.000000000 +0000
@@ -51,8 +51,10 @@
 (defun parse-selector (selector)
   (match-case (selector)
     ;; combinators
-    #+TODO (#T(regexp$ "[ ]*[~][ ]*" ()) (list (make-instance 'sibling-combinator    :matcher (parse-selector &rest))))
-    #+TODO (#T(regexp$ "[ ]*[+][ ]*" ()) (list (make-instance 'adjacent-combinator   :matcher (parse-selector &rest))))
+    (#T(regexp$ "[ ]*[~][ ]*" ())
+     (list (make-instance 'sibling-combinator    :matcher (parse-selector &rest))))
+    (#T(regexp$ "[ ]*[+][ ]*" ())
+     (list (make-instance 'adjacent-combinator   :matcher (parse-selector &rest))))
     (#T(regexp$ "[ ]*[>][ ]*" ())
      (list (make-instance 'child-combinator      :matcher (parse-selector &rest))))
     (#T(regexp$ "[ ]+"        ())
@@ -143,10 +145,18 @@
 (defmethod element-matches-p (element (selector descendant-combinator))
   (some (rcurry #'element-matches-p (matcher selector)) (element-ancestors element)))
 
-#+TODO
 (defmethod element-matches-p (element (selector adjacent-combinator))
-  ...)
+  (let* ((parent (element-parent element))
+         (siblings (element-children parent))
+         (ourpos (position element siblings :test #'eq)))
+    (and ourpos
+         (> ourpos 0)
+         (element-matches-p (elt siblings (1- ourpos)) (matcher selector)))))
 
-#+TODO
 (defmethod element-matches-p (element (selector sibling-combinator))
-  ...)
+  (let* ((parent (element-parent element))
+         (siblings (element-children parent))
+         (ourpos (position element siblings :test #'eq)))
+    (and ourpos
+         (> ourpos 0)
+         (find-if (rcurry #'element-matches-p (matcher selector)) siblings :end ourpos))))
diff -rN -u old-Oh, Ducks!/tests.lisp new-Oh, Ducks!/tests.lisp
--- old-Oh, Ducks!/tests.lisp	2015-12-09 14:27:37.000000000 +0000
+++ new-Oh, Ducks!/tests.lisp	2015-12-09 14:27:37.000000000 +0000
@@ -59,6 +59,17 @@
           "<div>I do <i>not</i> <i>like</i> cheese.</div><div><span>I like <i>cheese</i>.</span></div>")
   (values div))
 
+(match (#T(html (:model dom)
+                ("b + i" . ?i))
+        "<div>I <b>really</b> <i>like</i> cheese.  Do you not <i>dislike</i> cheese?</div>")
+  (values i))
+
+(match (#T(html (:model dom)
+                ("b ~ i" . ?i))
+        "<div>I <i>really</i> <b>like</b> cheese.  Do you not <i>dislike</i> cheese?</div>")
+  (values i))
+
+
 #+LATER?
 (match (#t(html ("div::content" . #t(regexp+ "^f(o+)" (?o))))
         "<div>barbaz</div><div>fooooooobar</div>")