Issue 600362: Relocated parse_qs() and parse_qsl(), from the cgi module

to the urlparse one.  Added a DeprecationWarning in the old module, it
will be deprecated in the future.  Docs and tests updated.

Author: facundobatista

Doc/library/cgi.rst

@@ -257,57 +257,26 @@ algorithms implemented in this module in other circumstances.
 
    Parse a query in the environment or from a file (the file defaults to
    ``sys.stdin``).  The *keep_blank_values* and *strict_parsing* parameters are
-   passed to :func:`parse_qs` unchanged.
+   passed to :func:`urllib.parse.parse_qs` unchanged.
 
 
 .. function:: parse_qs(qs[, keep_blank_values[, strict_parsing]])
 
-   Parse a query string given as a string argument (data of type
-   :mimetype:`application/x-www-form-urlencoded`).  Data are returned as a
-   dictionary.  The dictionary keys are the unique query variable names and the
-   values are lists of values for each name.
-
-   The optional argument *keep_blank_values* is a flag indicating whether blank
-   values in URL encoded queries should be treated as blank strings.   A true value
-   indicates that blanks should be retained as  blank strings.  The default false
-   value indicates that blank values are to be ignored and treated as if they were
-   not included.
-
-   The optional argument *strict_parsing* is a flag indicating what to do with
-   parsing errors.  If false (the default), errors are silently ignored.  If true,
-   errors raise a :exc:`ValueError` exception.
-
-   Use the :func:`urllib.parse.urlencode` function to convert such dictionaries into
-   query strings.
-
+   This function is deprecated in this module. Use :func:`urllib.parse.parse_qs`
+   instead. It is maintained here only for backward compatiblity.
 
 .. function:: parse_qsl(qs[, keep_blank_values[, strict_parsing]])
 
-   Parse a query string given as a string argument (data of type
-   :mimetype:`application/x-www-form-urlencoded`).  Data are returned as a list of
-   name, value pairs.
-
-   The optional argument *keep_blank_values* is a flag indicating whether blank
-   values in URL encoded queries should be treated as blank strings.   A true value
-   indicates that blanks should be retained as  blank strings.  The default false
-   value indicates that blank values are to be ignored and treated as if they were
-   not included.
-
-   The optional argument *strict_parsing* is a flag indicating what to do with
-   parsing errors.  If false (the default), errors are silently ignored.  If true,
-   errors raise a :exc:`ValueError` exception.
-
-   Use the :func:`urllib.parse.urlencode` function to convert such lists of pairs into
-   query strings.
-
+   This function is deprecated in this module. Use :func:`urllib.parse.parse_qs`
+   instead. It is maintained here only for backward compatiblity.
 
 .. function:: parse_multipart(fp, pdict)
 
    Parse input of type :mimetype:`multipart/form-data` (for  file uploads).
    Arguments are *fp* for the input file and *pdict* for a dictionary containing
    other parameters in the :mailheader:`Content-Type` header.
 
-   Returns a dictionary just like :func:`parse_qs` keys are the field names, each
+   Returns a dictionary just like :func:`urllib.parse.parse_qs` keys are the field names, each
    value is a list of values for that field.  This is easy to use but not much good
    if you are expecting megabytes to be uploaded --- in that case, use the
    :class:`FieldStorage` class instead which is much more flexible.

Doc/library/urllib.parse.rst

@@ -89,6 +89,47 @@ The :mod:`urllib.parse` module defines the following functions:
    object.
 
 
+.. function:: parse_qs(qs[, keep_blank_values[, strict_parsing]])
+
+   Parse a query string given as a string argument (data of type
+   :mimetype:`application/x-www-form-urlencoded`).  Data are returned as a
+   dictionary.  The dictionary keys are the unique query variable names and the
+   values are lists of values for each name.
+
+   The optional argument *keep_blank_values* is a flag indicating whether blank
+   values in URL encoded queries should be treated as blank strings.   A true value
+   indicates that blanks should be retained as  blank strings.  The default false
+   value indicates that blank values are to be ignored and treated as if they were
+   not included.
+
+   The optional argument *strict_parsing* is a flag indicating what to do with
+   parsing errors.  If false (the default), errors are silently ignored.  If true,
+   errors raise a :exc:`ValueError` exception.
+
+   Use the :func:`urllib.urlencode` function to convert such dictionaries into
+   query strings.
+
+
+.. function:: parse_qsl(qs[, keep_blank_values[, strict_parsing]])
+
+   Parse a query string given as a string argument (data of type
+   :mimetype:`application/x-www-form-urlencoded`).  Data are returned as a list of
+   name, value pairs.
+
+   The optional argument *keep_blank_values* is a flag indicating whether blank
+   values in URL encoded queries should be treated as blank strings.   A true value
+   indicates that blanks should be retained as  blank strings.  The default false
+   value indicates that blank values are to be ignored and treated as if they were
+   not included.
+
+   The optional argument *strict_parsing* is a flag indicating what to do with
+   parsing errors.  If false (the default), errors are silently ignored.  If true,
+   errors raise a :exc:`ValueError` exception.
+
+   Use the :func:`urllib.parse.urlencode` function to convert such lists of pairs into
+   query strings.
+
+
 .. function:: urlunparse(parts)
 
    Construct a URL from a tuple as returned by ``urlparse()``. The *parts*
@@ -273,7 +314,7 @@ The :mod:`urllib.parse` module defines the following functions:
    of the sequence. When a sequence of two-element tuples is used as the *query*
    argument, the first element of each tuple is a key and the second is a value.
    The order of parameters in the encoded string will match the order of parameter
-   tuples in the sequence. The :mod:`cgi` module provides the functions
+   tuples in the sequence. This module provides the functions
    :func:`parse_qs` and :func:`parse_qsl` which are used to parse query strings
    into Python data structures.
 

Lib/cgi.py

@@ -37,6 +37,7 @@
 import os
 import urllib.parse
 import email.parser
+from warnings import warn
 
 __all__ = ["MiniFieldStorage", "FieldStorage",
            "parse", "parse_qs", "parse_qsl", "parse_multipart",
@@ -153,75 +154,23 @@ def parse(fp=None, environ=os.environ, keep_blank_values=0, strict_parsing=0):
         else:
             qs = ""
         environ['QUERY_STRING'] = qs    # XXX Shouldn't, really
-    return parse_qs(qs, keep_blank_values, strict_parsing)
+    return urllib.parse.parse_qs(qs, keep_blank_values, strict_parsing)
 
 
-def parse_qs(qs, keep_blank_values=0, strict_parsing=0):
-    """Parse a query given as a string argument.
-
-        Arguments:
+# parse query string function called from urlparse,
+# this is done in order to maintain backward compatiblity.
 
-        qs: URL-encoded query string to be parsed
-
-        keep_blank_values: flag indicating whether blank values in
-            URL encoded queries should be treated as blank strings.
-            A true value indicates that blanks should be retained as
-            blank strings.  The default false value indicates that
-            blank values are to be ignored and treated as if they were
-            not included.
-
-        strict_parsing: flag indicating what to do with parsing errors.
-            If false (the default), errors are silently ignored.
-            If true, errors raise a ValueError exception.
-    """
-    dict = {}
-    for name, value in parse_qsl(qs, keep_blank_values, strict_parsing):
-        if name in dict:
-            dict[name].append(value)
-        else:
-            dict[name] = [value]
-    return dict
+def parse_qs(qs, keep_blank_values=0, strict_parsing=0):
+    """Parse a query given as a string argument."""
+    warn("cgi.parse_qs is deprecated, use urllib.parse.parse_qs instead",
+            DeprecationWarning)
+    return urllib.parse.parse_qs(qs, keep_blank_values, strict_parsing)
 
 def parse_qsl(qs, keep_blank_values=0, strict_parsing=0):
-    """Parse a query given as a string argument.
-
-    Arguments:
-
-    qs: URL-encoded query string to be parsed
-
-    keep_blank_values: flag indicating whether blank values in
-        URL encoded queries should be treated as blank strings.  A
-        true value indicates that blanks should be retained as blank
-        strings.  The default false value indicates that blank values
-        are to be ignored and treated as if they were  not included.
-
-    strict_parsing: flag indicating what to do with parsing errors. If
-        false (the default), errors are silently ignored. If true,
-        errors raise a ValueError exception.
-
-    Returns a list, as G-d intended.
-    """
-    pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
-    r = []
-    for name_value in pairs:
-        if not name_value and not strict_parsing:
-            continue
-        nv = name_value.split('=', 1)
-        if len(nv) != 2:
-            if strict_parsing:
-                raise ValueError("bad query field: %r" % (name_value,))
-            # Handle case of a control-name with no equal sign
-            if keep_blank_values:
-                nv.append('')
-            else:
-                continue
-        if len(nv[1]) or keep_blank_values:
-            name = urllib.parse.unquote(nv[0].replace('+', ' '))
-            value = urllib.parse.unquote(nv[1].replace('+', ' '))
-            r.append((name, value))
-
-    return r
-
+    """Parse a query given as a string argument."""
+    warn("cgi.parse_qsl is deprecated, use urllib.parse.parse_qs instead",
+            DeprecationWarning)
+    return urllib.parse.parse_qsl(qs, keep_blank_values, strict_parsing)
 
 def parse_multipart(fp, pdict):
     """Parse multipart input.
@@ -624,8 +573,8 @@ def read_urlencoded(self):
         if self.qs_on_post:
             qs += '&' + self.qs_on_post
         self.list = list = []
-        for key, value in parse_qsl(qs, self.keep_blank_values,
-                                    self.strict_parsing):
+        for key, value in urllib.parse.parse_qsl(qs, self.keep_blank_values,
+                                self.strict_parsing):
             list.append(MiniFieldStorage(key, value))
         self.skip_lines()
 
@@ -638,8 +587,8 @@ def read_multi(self, environ, keep_blank_values, strict_parsing):
             raise ValueError('Invalid boundary in multipart form: %r' % (ib,))
         self.list = []
         if self.qs_on_post:
-            for key, value in parse_qsl(self.qs_on_post, self.keep_blank_values,
-                                        self.strict_parsing):
+            for key, value in urllib.parse.parse_qsl(self.qs_on_post,
+                                    self.keep_blank_values, self.strict_parsing):
                 self.list.append(MiniFieldStorage(key, value))
             FieldStorageClass = None
 

Lib/test/test_cgi.py

@@ -53,25 +53,6 @@ def do_test(buf, method):
     except Exception as err:
         return ComparableException(err)
 
-# A list of test cases.  Each test case is a a two-tuple that contains
-# a string with the query and a dictionary with the expected result.
-
-parse_qsl_test_cases = [
-    ("", []),
-    ("&", []),
-    ("&&", []),
-    ("=", [('', '')]),
-    ("=a", [('', 'a')]),
-    ("a", [('a', '')]),
-    ("a=", [('a', '')]),
-    ("a=", [('a', '')]),
-    ("&a=b", [('a', 'b')]),
-    ("a=a+b&b=b+c", [('a', 'a b'), ('b', 'b c')]),
-    ("a=1&a=2", [('a', '1'), ('a', '2')]),
-    ("a=%26&b=%3D", [('a', '&'), ('b', '=')]),
-    ("a=%C3%BC&b=%CA%83", [('a', '\xfc'), ('b', '\u0283')]),
-]
-
 parse_strict_test_cases = [
     ("", ValueError("bad query field: ''")),
     ("&", ValueError("bad query field: ''")),
@@ -141,11 +122,6 @@ def gen_result(data, environ):
 
 class CgiTests(unittest.TestCase):
 
-    def test_qsl(self):
-        for orig, expect in parse_qsl_test_cases:
-            result = cgi.parse_qsl(orig, keep_blank_values=True)
-            self.assertEqual(result, expect, "Error parsing %s" % repr(orig))
-
     def test_strict(self):
         for orig, expect in parse_strict_test_cases:
             # Test basic parsing

Lib/test/test_urlparse.py

@@ -8,6 +8,23 @@
 RFC2396_BASE = "http://a/b/c/d;p?q"
 RFC3986_BASE = "http://a/b/c/d;p?q"
 
+# A list of test cases.  Each test case is a a two-tuple that contains
+# a string with the query and a dictionary with the expected result.
+
+parse_qsl_test_cases = [
+    ("", []),
+    ("&", []),
+    ("&&", []),
+    ("=", [('', '')]),
+    ("=a", [('', 'a')]),
+    ("a", [('a', '')]),
+    ("a=", [('a', '')]),
+    ("a=", [('a', '')]),
+    ("&a=b", [('a', 'b')]),
+    ("a=a+b&b=b+c", [('a', 'a b'), ('b', 'b c')]),
+    ("a=1&a=2", [('a', '1'), ('a', '2')]),
+]
+
 class UrlParseTestCase(unittest.TestCase):
 
     def checkRoundtrips(self, url, parsed, split):
@@ -61,6 +78,12 @@ def checkRoundtrips(self, url, parsed, split):
         self.assertEqual(result3.hostname, result.hostname)
         self.assertEqual(result3.port,     result.port)
 
+    def test_qsl(self):
+        for orig, expect in parse_qsl_test_cases:
+            result = urllib.parse.parse_qsl(orig, keep_blank_values=True)
+            self.assertEqual(result, expect, "Error parsing %s" % repr(orig))
+
+
     def test_roundtrips(self):
         testcases = [
             ('file:///tmp/junk.txt',

Lib/urllib/parse.py

@@ -8,7 +8,7 @@
 import collections
 
 __all__ = ["urlparse", "urlunparse", "urljoin", "urldefrag",
-           "urlsplit", "urlunsplit",
+           "urlsplit", "urlunsplit", "parse_qs", "parse_qsl",
            "quote", "quote_plus", "quote_from_bytes",
            "unquote", "unquote_plus", "unquote_to_bytes"]
 
@@ -329,6 +329,72 @@ def unquote(string, encoding='utf-8', errors='replace'):
         res[-1] = b''.join(pct_sequence).decode(encoding, errors)
     return ''.join(res)
 
+def parse_qs(qs, keep_blank_values=0, strict_parsing=0):
+    """Parse a query given as a string argument.
+
+        Arguments:
+
+        qs: URL-encoded query string to be parsed
+
+        keep_blank_values: flag indicating whether blank values in
+            URL encoded queries should be treated as blank strings.
+            A true value indicates that blanks should be retained as
+            blank strings.  The default false value indicates that
+            blank values are to be ignored and treated as if they were
+            not included.
+
+        strict_parsing: flag indicating what to do with parsing errors.
+            If false (the default), errors are silently ignored.
+            If true, errors raise a ValueError exception.
+    """
+    dict = {}
+    for name, value in parse_qsl(qs, keep_blank_values, strict_parsing):
+        if name in dict:
+            dict[name].append(value)
+        else:
+            dict[name] = [value]
+    return dict
+
+def parse_qsl(qs, keep_blank_values=0, strict_parsing=0):
+    """Parse a query given as a string argument.
+
+    Arguments:
+
+    qs: URL-encoded query string to be parsed
+
+    keep_blank_values: flag indicating whether blank values in
+        URL encoded queries should be treated as blank strings.  A
+        true value indicates that blanks should be retained as blank
+        strings.  The default false value indicates that blank values
+        are to be ignored and treated as if they were  not included.
+
+    strict_parsing: flag indicating what to do with parsing errors. If
+        false (the default), errors are silently ignored. If true,
+        errors raise a ValueError exception.
+
+    Returns a list, as G-d intended.
+    """
+    pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
+    r = []
+    for name_value in pairs:
+        if not name_value and not strict_parsing:
+            continue
+        nv = name_value.split('=', 1)
+        if len(nv) != 2:
+            if strict_parsing:
+                raise ValueError("bad query field: %r" % (name_value,))
+            # Handle case of a control-name with no equal sign
+            if keep_blank_values:
+                nv.append('')
+            else:
+                continue
+        if len(nv[1]) or keep_blank_values:
+            name = unquote(nv[0].replace('+', ' '))
+            value = unquote(nv[1].replace('+', ' '))
+            r.append((name, value))
+
+    return r
+
 def unquote_plus(string, encoding='utf-8', errors='replace'):
     """Like unquote(), but also replace plus signs by spaces, as required for
     unquoting HTML form values.