--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/request.py	Fri Feb 06 20:49:29 2009 +0200
@@ -0,0 +1,73 @@
+
+import os.path
+
+def get_site_url (script_name) :
+    """
+        Get the URL that points to the site root (i.e. where style.css is) using the given value of SCRIPT_NAME
+
+        /foo/bar/quux.py                -> /foo
+        /~terom/qmsk.net/site/index.py  -> /~terom/qmsk.net
+        /                               -> ""
+        None                            -> ""
+    """
+    
+    if script_name :
+        return os.path.dirname(os.path.dirname(script_name)).rstrip("/")
+    else :
+        return ""
+
+def get_page_path (path_info, default) :
+    """
+        Get the path of the page that was requested, or the given default is empty/invalid.
+        The path will never begin with an /.
+
+        /quux       -> quux
+        /           -> <default>
+        None        -> <default>
+    """
+    
+    if path_info :
+        # remove prefixed slashes
+        path_info = path_info.lstrip('/')
+
+    if path_info :
+        return path_info
+    else :
+        return default
+
+
+class Request (object) :
+    # The name of the site itself, this can be used to reference e.g. style.css
+    site_url = None
+
+    # The page root url, for links to pages
+    page_root = None
+
+    # The full path to the requested page
+    page_path = None
+    
+    def __init__ (self, environ, default_page='main') :
+        self.site_url = get_site_url(environ.get("SCRIPT_NAME"))
+        self.page_root = environ.get("SCRIPT_NAME")
+        self.page_path = get_page_path(environ.get("PATH_INFO"), default_page)
+    
+    def page_name_parts (self) :
+        """
+            Returns a list of page name components
+        """
+
+        return self.page_path.split('/')
+
+    def page_name_prefixes (self) :
+        """
+            Iterate over the components of the page name, yielding (prefix, suffix) pairs
+        """
+        
+        prefix = self.page_name_parts()
+        suffix = []
+
+        while prefix :
+            yield ('/'.join(prefix), '/'.join(suffix))
+
+            suffix.insert(0, prefix.pop(-1))
+