From 1ba255659ee9c0d2ed33cdcc07473be092f541cb Mon Sep 17 00:00:00 2001
From: ianb <devnull@localhost>
Date: Sun, 12 Jun 2005 18:21:41 +0000
Subject: Added function for parsing QUERY_STRING

---
 paste/wsgilib.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'paste')

diff --git a/paste/wsgilib.py b/paste/wsgilib.py
index 4f53ac1..20604b1 100644
--- a/paste/wsgilib.py
+++ b/paste/wsgilib.py
@@ -6,6 +6,7 @@ from Cookie import SimpleCookie
 from cStringIO import StringIO
 import mimetypes
 import os
+import cgi
 
 __all__ = ['get_cookies', 'add_close', 'raw_interactive',
            'interactive', 'construct_url', 'error_body_response',
@@ -28,6 +29,28 @@ def get_cookies(environ):
     environ['paste.cookies'] = (cookies, header)
     return cookies
 
+def parse_querystring(environ):
+    """
+    Parses a query string into a list like ``[(name, value)]``.
+    Caches this value in case parse_querystring is called again
+    for the same request.
+
+    You can pass the result to ``dict()``, but be aware that keys that
+    appear multiple times will be lost (only the last value will be
+    preserved).
+    """
+    source = environ.get('QUERY_STRING', '')
+    if not source:
+        return []
+    if 'paste.parsed_querystring' in environ:
+        parsed, check_source = environ['paste.parsed_querystring']
+        if check_source == source:
+            return parsed
+    parsed = cgi.parse_qs(source, keep_blank_values=True,
+                          strict_parsing=False)
+    environ['paste.parsed_querystring'] = (parsed, source)
+    return parsed
+
 class add_close:
     """
     An an iterable that iterates over app_iter, then calls
-- 
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