[Zope3-checkins] SVN: Zope3/trunk/ ``ClientForm`` changed from a file based module to a package.

Baiju M baiju.m.mail at gmail.com
Tue Sep 26 06:44:45 EDT 2006


Log message for revision 70384:
  ``ClientForm`` changed from a file based module to a package.
  Do not back port this change.
  

Changed:
  U   Zope3/trunk/doc/CHANGES.txt
  A   Zope3/trunk/src/ClientForm/
  A   Zope3/trunk/src/ClientForm/ClientForm.py
  A   Zope3/trunk/src/ClientForm/__init__.py
  D   Zope3/trunk/src/ClientForm.py

-=-
Modified: Zope3/trunk/doc/CHANGES.txt
===================================================================
--- Zope3/trunk/doc/CHANGES.txt	2006-09-26 09:20:09 UTC (rev 70383)
+++ Zope3/trunk/doc/CHANGES.txt	2006-09-26 10:44:44 UTC (rev 70384)
@@ -59,6 +59,8 @@
 
     Restructuring
 
+      - ``ClientForm`` changed from a file based module to a package.
+
       - Changed internal widget API to allow retrieving the current value
         (from request, default or current field value) in addition to the
         current form representation of the value.

Copied: Zope3/trunk/src/ClientForm/ClientForm.py (from rev 70379, Zope3/trunk/src/ClientForm.py)

Added: Zope3/trunk/src/ClientForm/__init__.py
===================================================================
--- Zope3/trunk/src/ClientForm/__init__.py	2006-09-26 09:20:09 UTC (rev 70383)
+++ Zope3/trunk/src/ClientForm/__init__.py	2006-09-26 10:44:44 UTC (rev 70384)
@@ -0,0 +1,18 @@
+##############################################################################
+#
+# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""ClientForm
+
+$Id$
+"""
+from ClientForm import *


Property changes on: Zope3/trunk/src/ClientForm/__init__.py
___________________________________________________________________
Name: svn:keywords
   + Id
Name: svn:eol-style
   + native

Deleted: Zope3/trunk/src/ClientForm.py
===================================================================
--- Zope3/trunk/src/ClientForm.py	2006-09-26 09:20:09 UTC (rev 70383)
+++ Zope3/trunk/src/ClientForm.py	2006-09-26 10:44:44 UTC (rev 70384)
@@ -1,3223 +0,0 @@
-"""HTML form handling for web clients.
-
-ClientForm is a Python module for handling HTML forms on the client
-side, useful for parsing HTML forms, filling them in and returning the
-completed forms to the server.  It has developed from a port of Gisle
-Aas' Perl module HTML::Form, from the libwww-perl library, but the
-interface is not the same.
-
-The most useful docstring is the one for HTMLForm.
-
-RFC 1866: HTML 2.0
-RFC 1867: Form-based File Upload in HTML
-RFC 2388: Returning Values from Forms: multipart/form-data
-HTML 3.2 Specification, W3C Recommendation 14 January 1997 (for ISINDEX)
-HTML 4.01 Specification, W3C Recommendation 24 December 1999
-
-
-Copyright 2002-2006 John J. Lee <jjl at pobox.com>
-Copyright 2005 Gary Poster
-Copyright 2005 Zope Corporation
-Copyright 1998-2000 Gisle Aas.
-
-This code is free software; you can redistribute it and/or modify it
-under the terms of the BSD License (see the file COPYING included with
-the distribution).
-
-"""
-
-# XXX
-# Remove unescape_attr method
-# Remove parser testing hack
-# safeUrl()-ize action
-# Really should to merge CC, CF, pp and mechanize as soon as mechanize
-#  goes to beta...
-# Add url attribute to ParseError
-# Switch to unicode throughout (would be 0.3.x)
-#  See Wichert Akkerman's 2004-01-22 message to c.l.py.
-# Add charset parameter to Content-type headers?  How to find value??
-# Add some more functional tests
-#  Especially single and multiple file upload on the internet.
-#  Does file upload work when name is missing?  Sourceforge tracker form
-#   doesn't like it.  Check standards, and test with Apache.  Test
-#   binary upload with Apache.
-# Controls can have name=None (e.g. forms constructed partly with
-#  JavaScript), but find_control can't be told to find a control
-#  with that name, because None there means 'unspecified'.  Can still
-#  get at by nr, but would be nice to be able to specify something
-#  equivalent to name=None, too.
-# mailto submission & enctype text/plain
-# I'm not going to fix this unless somebody tells me what real servers
-#  that want this encoding actually expect: If enctype is
-#  application/x-www-form-urlencoded and there's a FILE control present.
-#  Strictly, it should be 'name=data' (see HTML 4.01 spec., section
-#  17.13.2), but I send "name=" ATM.  What about multiple file upload??
-
-# Would be nice, but I'm not going to do it myself:
-# -------------------------------------------------
-# Maybe a 0.4.x?
-#   Replace by_label etc. with moniker / selector concept. Allows, eg.,
-#    a choice between selection by value / id / label / element
-#    contents.  Or choice between matching labels exactly or by
-#    substring.  Etc.
-#   Remove deprecated methods.
-#   ...what else?
-# Work on DOMForm.
-# XForms?  Don't know if there's a need here.
-
-
-try: True
-except NameError:
-    True = 1
-    False = 0
-
-try: bool
-except NameError:
-    def bool(expr):
-        if expr: return True
-        else: return False
-
-try:
-    import logging
-except ImportError:
-    def debug(msg, *args, **kwds):
-        pass
-else:
-    _logger = logging.getLogger("ClientForm")
-    OPTIMIZATION_HACK = True
-
-    def debug(msg, *args, **kwds):
-        if OPTIMIZATION_HACK:
-            return
-
-        try:
-            raise Exception()
-        except:
-            caller_name = (
-                sys.exc_info()[2].tb_frame.f_back.f_back.f_code.co_name)
-        extended_msg = '%%s %s' % msg
-        extended_args = (caller_name,)+args
-        debug = _logger.debug(extended_msg, *extended_args, **kwds)
-
-    def _show_debug_messages():
-        global OPTIMIZATION_HACK
-        OPTIMIZATION_HACK = False
-        _logger.setLevel(logging.DEBUG)
-        handler = logging.StreamHandler(sys.stdout)
-        handler.setLevel(logging.DEBUG)
-        _logger.addHandler(handler)
-
-import sys, urllib, urllib2, types, mimetools, copy, urlparse, \
-       htmlentitydefs, re, random
-from urlparse import urljoin
-from cStringIO import StringIO
-
-try:
-    import warnings
-except ImportError:
-    def deprecation(message):
-        pass
-else:
-    def deprecation(message):
-        warnings.warn(message, DeprecationWarning, stacklevel=2)
-
-VERSION = "0.2.2"
-
-CHUNK = 1024  # size of chunks fed to parser, in bytes
-
-DEFAULT_ENCODING = "latin-1"
-
-_compress_re = re.compile(r"\s+")
-def compress_text(text): return _compress_re.sub(" ", text.strip())
-
-# This version of urlencode is from my Python 1.5.2 back-port of the
-# Python 2.1 CVS maintenance branch of urllib.  It will accept a sequence
-# of pairs instead of a mapping -- the 2.0 version only accepts a mapping.
-def urlencode(query,doseq=False,):
-    """Encode a sequence of two-element tuples or dictionary into a URL query \
-string.
-
-    If any values in the query arg are sequences and doseq is true, each
-    sequence element is converted to a separate parameter.
-
-    If the query arg is a sequence of two-element tuples, the order of the
-    parameters in the output will match the order of parameters in the
-    input.
-    """
-
-    if hasattr(query,"items"):
-        # mapping objects
-        query = query.items()
-    else:
-        # it's a bother at times that strings and string-like objects are
-        # sequences...
-        try:
-            # non-sequence items should not work with len()
-            x = len(query)
-            # non-empty strings will fail this
-            if len(query) and type(query[0]) != types.TupleType:
-                raise TypeError()
-            # zero-length sequences of all types will get here and succeed,
-            # but that's a minor nit - since the original implementation
-            # allowed empty dicts that type of behavior probably should be
-            # preserved for consistency
-        except TypeError:
-            ty,va,tb = sys.exc_info()
-            raise TypeError("not a valid non-string sequence or mapping "
-                            "object", tb)
-
-    l = []
-    if not doseq:
-        # preserve old behavior
-        for k, v in query:
-            k = urllib.quote_plus(str(k))
-            v = urllib.quote_plus(str(v))
-            l.append(k + '=' + v)
-    else:
-        for k, v in query:
-            k = urllib.quote_plus(str(k))
-            if type(v) == types.StringType:
-                v = urllib.quote_plus(v)
-                l.append(k + '=' + v)
-            elif type(v) == types.UnicodeType:
-                # is there a reasonable way to convert to ASCII?
-                # encode generates a string, but "replace" or "ignore"
-                # lose information and "strict" can raise UnicodeError
-                v = urllib.quote_plus(v.encode("ASCII","replace"))
-                l.append(k + '=' + v)
-            else:
-                try:
-                    # is this a sufficient test for sequence-ness?
-                    x = len(v)
-                except TypeError:
-                    # not a sequence
-                    v = urllib.quote_plus(str(v))
-                    l.append(k + '=' + v)
-                else:
-                    # loop over the sequence
-                    for elt in v:
-                        l.append(k + '=' + urllib.quote_plus(str(elt)))
-    return '&'.join(l)
-
-def unescape(data, entities, encoding=DEFAULT_ENCODING):
-    if data is None or "&" not in data:
-        return data
-
-    def replace_entities(match, entities=entities, encoding=encoding):
-        ent = match.group()
-        if ent[1] == "#":
-            return unescape_charref(ent[2:-1], encoding)
-
-        repl = entities.get(ent)
-        if repl is not None:
-            if type(repl) != type(""):
-                try:
-                    repl = repl.encode(encoding)
-                except UnicodeError:
-                    repl = ent
-        else:
-            repl = ent
-
-        return repl
-
-    return re.sub(r"&#?[A-Za-z0-9]+?;", replace_entities, data)
-
-def unescape_charref(data, encoding):
-    name, base = data, 10
-    if name.startswith("x"):
-        name, base= name[1:], 16
-    uc = unichr(int(name, base))
-    if encoding is None:
-        return uc
-    else:
-        try:
-            repl = uc.encode(encoding)
-        except UnicodeError:
-            repl = "&#%s;" % data
-        return repl
-
-def get_entitydefs():
-    import htmlentitydefs
-    from codecs import latin_1_decode
-    entitydefs = {}
-    try:
-        htmlentitydefs.name2codepoint
-    except AttributeError:
-        entitydefs = {}
-        for name, char in htmlentitydefs.entitydefs.items():
-            uc = latin_1_decode(char)[0]
-            if uc.startswith("&#") and uc.endswith(";"):
-                uc = unescape_charref(uc[2:-1], None)
-            entitydefs["&%s;" % name] = uc
-    else:
-        for name, codepoint in htmlentitydefs.name2codepoint.items():
-            entitydefs["&%s;" % name] = unichr(codepoint)
-    return entitydefs
-
-
-def issequence(x):
-    try:
-        x[0]
-    except (TypeError, KeyError):
-        return False
-    except IndexError:
-        pass
-    return True
-
-def isstringlike(x):
-    try: x+""
-    except: return False
-    else: return True
-
-
-def choose_boundary():
-    """Return a string usable as a multipart boundary."""
-    # follow IE and firefox
-    nonce = "".join([str(random.randint(0, sys.maxint-1)) for i in 0,1,2])
-    return "-"*27 + nonce
-
-# This cut-n-pasted MimeWriter from standard library is here so can add
-# to HTTP headers rather than message body when appropriate.  It also uses
-# \r\n in place of \n.  This is a bit nasty.
-class MimeWriter:
-
-    """Generic MIME writer.
-
-    Methods:
-
-    __init__()
-    addheader()
-    flushheaders()
-    startbody()
-    startmultipartbody()
-    nextpart()
-    lastpart()
-
-    A MIME writer is much more primitive than a MIME parser.  It
-    doesn't seek around on the output file, and it doesn't use large
-    amounts of buffer space, so you have to write the parts in the
-    order they should occur on the output file.  It does buffer the
-    headers you add, allowing you to rearrange their order.
-
-    General usage is:
-
-    f = <open the output file>
-    w = MimeWriter(f)
-    ...call w.addheader(key, value) 0 or more times...
-
-    followed by either:
-
-    f = w.startbody(content_type)
-    ...call f.write(data) for body data...
-
-    or:
-
-    w.startmultipartbody(subtype)
-    for each part:
-        subwriter = w.nextpart()
-        ...use the subwriter's methods to create the subpart...
-    w.lastpart()
-
-    The subwriter is another MimeWriter instance, and should be
-    treated in the same way as the toplevel MimeWriter.  This way,
-    writing recursive body parts is easy.
-
-    Warning: don't forget to call lastpart()!
-
-    XXX There should be more state so calls made in the wrong order
-    are detected.
-
-    Some special cases:
-
-    - startbody() just returns the file passed to the constructor;
-      but don't use this knowledge, as it may be changed.
-
-    - startmultipartbody() actually returns a file as well;
-      this can be used to write the initial 'if you can read this your
-      mailer is not MIME-aware' message.
-
-    - If you call flushheaders(), the headers accumulated so far are
-      written out (and forgotten); this is useful if you don't need a
-      body part at all, e.g. for a subpart of type message/rfc822
-      that's (mis)used to store some header-like information.
-
-    - Passing a keyword argument 'prefix=<flag>' to addheader(),
-      start*body() affects where the header is inserted; 0 means
-      append at the end, 1 means insert at the start; default is
-      append for addheader(), but insert for start*body(), which use
-      it to determine where the Content-type header goes.
-
-    """
-
-    def __init__(self, fp, http_hdrs=None):
-        self._http_hdrs = http_hdrs
-        self._fp = fp
-        self._headers = []
-        self._boundary = []
-        self._first_part = True
-
-    def addheader(self, key, value, prefix=0,
-                  add_to_http_hdrs=0):
-        """
-        prefix is ignored if add_to_http_hdrs is true.
-        """
-        lines = value.split("\r\n")
-        while lines and not lines[-1]: del lines[-1]
-        while lines and not lines[0]: del lines[0]
-        if add_to_http_hdrs:
-            value = "".join(lines)
-            self._http_hdrs.append((key, value))
-        else:
-            for i in range(1, len(lines)):
-                lines[i] = "    " + lines[i].strip()
-            value = "\r\n".join(lines) + "\r\n"
-            line = key + ": " + value
-            if prefix:
-                self._headers.insert(0, line)
-            else:
-                self._headers.append(line)
-
-    def flushheaders(self):
-        self._fp.writelines(self._headers)
-        self._headers = []
-
-    def startbody(self, ctype=None, plist=[], prefix=1,
-                  add_to_http_hdrs=0, content_type=1):
-        """
-        prefix is ignored if add_to_http_hdrs is true.
-        """
-        if content_type and ctype:
-            for name, value in plist:
-                ctype = ctype + ';\r\n %s=%s' % (name, value)
-            self.addheader("Content-type", ctype, prefix=prefix,
-                           add_to_http_hdrs=add_to_http_hdrs)
-        self.flushheaders()
-        if not add_to_http_hdrs: self._fp.write("\r\n")
-        self._first_part = True
-        return self._fp
-
-    def startmultipartbody(self, subtype, boundary=None, plist=[], prefix=1,
-                           add_to_http_hdrs=0, content_type=1):
-        boundary = boundary or choose_boundary()
-        self._boundary.append(boundary)
-        return self.startbody("multipart/" + subtype,
-                              [("boundary", boundary)] + plist,
-                              prefix=prefix,
-                              add_to_http_hdrs=add_to_http_hdrs,
-                              content_type=content_type)
-
-    def nextpart(self):
-        boundary = self._boundary[-1]
-        if self._first_part:
-            self._first_part = False
-        else:
-            self._fp.write("\r\n")
-        self._fp.write("--" + boundary + "\r\n")
-        return self.__class__(self._fp)
-
-    def lastpart(self):
-        if self._first_part:
-            self.nextpart()
-        boundary = self._boundary.pop()
-        self._fp.write("\r\n--" + boundary + "--\r\n")
-
-
-class LocateError(ValueError): pass
-class AmbiguityError(LocateError): pass
-class ControlNotFoundError(LocateError): pass
-class ItemNotFoundError(LocateError): pass
-
-class ItemCountError(ValueError): pass
-
-
-class ParseError(Exception): pass
-
-
-class _AbstractFormParser:
-    """forms attribute contains HTMLForm instances on completion."""
-    # thanks to Moshe Zadka for an example of sgmllib/htmllib usage
-    def __init__(self, entitydefs=None, encoding=DEFAULT_ENCODING):
-        if entitydefs is None:
-            entitydefs = get_entitydefs()
-        self._entitydefs = entitydefs
-        self._encoding = encoding
-
-        self.base = None
-        self.forms = []
-        self.labels = []
-        self._current_label = None
-        self._current_form = None
-        self._select = None
-        self._optgroup = None
-        self._option = None
-        self._textarea = None
-
-    def do_base(self, attrs):
-        debug("%s", attrs)
-        for key, value in attrs:
-            if key == "href":
-                self.base = value
-
-    def end_body(self):
-        debug("")
-        if self._current_label is not None:
-            self.end_label()
-        if self._current_form is not None:
-            self.end_form()
-
-    def start_form(self, attrs):
-        debug("%s", attrs)
-        if self._current_form is not None:
-            raise ParseError("nested FORMs")
-        name = None
-        action = None
-        enctype = "application/x-www-form-urlencoded"
-        method = "GET"
-        d = {}
-        for key, value in attrs:
-            if key == "name":
-                name = value
-            elif key == "action":
-                action = value
-            elif key == "method":
-                method = value.upper()
-            elif key == "enctype":
-                enctype = value.lower()
-            d[key] = value
-        controls = []
-        self._current_form = (name, action, method, enctype), d, controls
-
-    def end_form(self):
-        debug("")
-        if self._current_label is not None:
-            self.end_label()
-        if self._current_form is None:
-            raise ParseError("end of FORM before start")
-        self.forms.append(self._current_form)
-        self._current_form = None
-
-    def start_select(self, attrs):
-        debug("%s", attrs)
-        if self._current_form is None:
-            raise ParseError("start of SELECT before start of FORM")
-        if self._select is not None:
-            raise ParseError("nested SELECTs")
-        if self._textarea is not None:
-            raise ParseError("SELECT inside TEXTAREA")
-        d = {}
-        for key, val in attrs:
-            d[key] = val
-
-        self._select = d
-        self._add_label(d)
-
-        self._append_select_control({"__select": d})
-
-    def end_select(self):
-        debug("")
-        if self._current_form is None:
-            raise ParseError("end of SELECT before start of FORM")
-        if self._select is None:
-            raise ParseError("end of SELECT before start")
-
-        if self._option is not None:
-            self._end_option()
-
-        self._select = None
-
-    def start_optgroup(self, attrs):
-        debug("%s", attrs)
-        if self._select is None:
-            raise ParseError("OPTGROUP outside of SELECT")
-        d = {}
-        for key, val in attrs:
-            d[key] = val
-
-        self._optgroup = d
-
-    def end_optgroup(self):
-        debug("")
-        if self._optgroup is None:
-            raise ParseError("end of OPTGROUP before start")
-        self._optgroup = None
-
-    def _start_option(self, attrs):
-        debug("%s", attrs)
-        if self._select is None:
-            raise ParseError("OPTION outside of SELECT")
-        if self._option is not None:
-            self._end_option()
-
-        d = {}
-        for key, val in attrs:
-            d[key] = val
-
-        self._option = {}
-        self._option.update(d)
-        if (self._optgroup and self._optgroup.has_key("disabled") and
-            not self._option.has_key("disabled")):
-            self._option["disabled"] = None
-
-    def _end_option(self):
-        debug("")
-        if self._option is None:
-            raise ParseError("end of OPTION before start")
-
-        contents = self._option.get("contents", "").strip()
-        self._option["contents"] = contents
-        if not self._option.has_key("value"):
-            self._option["value"] = contents
-        if not self._option.has_key("label"):
-            self._option["label"] = contents
-        # stuff dict of SELECT HTML attrs into a special private key
-        #  (gets deleted again later)
-        self._option["__select"] = self._select
-        self._append_select_control(self._option)
-        self._option = None
-
-    def _append_select_control(self, attrs):
-        debug("%s", attrs)
-        controls = self._current_form[2]
-        name = self._select.get("name")
-        controls.append(("select", name, attrs))
-
-    def start_textarea(self, attrs):
-        debug("%s", attrs)
-        if self._current_form is None:
-            raise ParseError("start of TEXTAREA before start of FORM")
-        if self._textarea is not None:
-            raise ParseError("nested TEXTAREAs")
-        if self._select is not None:
-            raise ParseError("TEXTAREA inside SELECT")
-        d = {}
-        for key, val in attrs:
-            d[key] = val
-        self._add_label(d)
-
-        self._textarea = d
-
-    def end_textarea(self):
-        debug("")
-        if self._current_form is None:
-            raise ParseError("end of TEXTAREA before start of FORM")
-        if self._textarea is None:
-            raise ParseError("end of TEXTAREA before start")
-        controls = self._current_form[2]
-        name = self._textarea.get("name")
-        controls.append(("textarea", name, self._textarea))
-        self._textarea = None
-
-    def start_label(self, attrs):
-        debug("%s", attrs)
-        if self._current_label:
-            self.end_label()
-        d = {}
-        for key, val in attrs:
-            d[key] = val
-        taken = bool(d.get("for"))  # empty id is invalid
-        d["__text"] = ""
-        d["__taken"] = taken
-        if taken:
-            self.labels.append(d)
-        self._current_label = d
-
-    def end_label(self):
-        debug("")
-        label = self._current_label
-        if label is None:
-            # something is ugly in the HTML, but we're ignoring it
-            return
-        self._current_label = None
-        label["__text"] = label["__text"]
-        # if it is staying around, it is True in all cases
-        del label["__taken"]
-
-    def _add_label(self, d):
-        #debug("%s", d)
-        if self._current_label is not None:
-            if self._current_label["__taken"]:
-                self.end_label()  # be fuzzy
-            else:
-                self._current_label["__taken"] = True
-                d["__label"] = self._current_label
-
-    def handle_data(self, data):
-        # according to http://www.w3.org/TR/html4/appendix/notes.html#h-B.3.1
-        # line break immediately after start tags or immediately before end
-        # tags must be ignored, but real browsers only ignore a line break
-        # after a start tag, so we'll do that.
-        if data[0:1] == '\n':
-            data = data[1:]
-
-        debug("%s", data)
-        if self._option is not None:
-            # self._option is a dictionary of the OPTION element's HTML
-            # attributes, but it has two special keys, one of which is the
-            # special "contents" key contains text between OPTION tags (the
-            # other is the "__select" key: see the end_option method)
-            map = self._option
-            key = "contents"
-        elif self._textarea is not None:
-            map = self._textarea
-            key = "value"
-        # not if within option or textarea
-        elif self._current_label is not None:
-            map = self._current_label
-            key = "__text"
-        else:
-            return
-
-        if not map.has_key(key):
-            map[key] = data
-        else:
-            map[key] = map[key] + data
-
-    def do_button(self, attrs):
-        debug("%s", attrs)
-        if self._current_form is None:
-            raise ParseError("start of BUTTON before start of FORM")
-        d = {}
-        d["type"] = "submit"  # default
-        for key, val in attrs:
-            d[key] = val
-        controls = self._current_form[2]
-
-        type = d["type"]
-        name = d.get("name")
-        # we don't want to lose information, so use a type string that
-        # doesn't clash with INPUT TYPE={SUBMIT,RESET,BUTTON}
-        # e.g. type for BUTTON/RESET is "resetbutton"
-        #     (type for INPUT/RESET is "reset")
-        type = type+"button"
-        self._add_label(d)
-        controls.append((type, name, d))
-
-    def do_input(self, attrs):
-        debug("%s", attrs)
-        if self._current_form is None:
-            raise ParseError("start of INPUT before start of FORM")
-        d = {}
-        d["type"] = "text"  # default
-        for key, val in attrs:
-            d[key] = val
-        controls = self._current_form[2]
-
-        type = d["type"]
-        name = d.get("name")
-        self._add_label(d)
-        controls.append((type, name, d))
-
-    def do_isindex(self, attrs):
-        debug("%s", attrs)
-        if self._current_form is None:
-            raise ParseError("start of ISINDEX before start of FORM")
-        d = {}
-        for key, val in attrs:
-            d[key] = val
-        controls = self._current_form[2]
-
-        self._add_label(d)
-        # isindex doesn't have type or name HTML attributes
-        controls.append(("isindex", None, d))
-
-    def handle_entityref(self, name):
-        #debug("%s", name)
-        self.handle_data(unescape(
-            '&%s;' % name, self._entitydefs, self._encoding))
-
-    def handle_charref(self, name):
-        #debug("%s", name)
-        self.handle_data(unescape_charref(name, self._encoding))
-
-    def unescape_attr(self, name):
-        #debug("%s", name)
-        return unescape(name, self._entitydefs, self._encoding)
-
-    def unescape_attrs(self, attrs):
-        #debug("%s", attrs)
-        escaped_attrs = {}
-        for key, val in attrs.items():
-            try:
-                val.items
-            except AttributeError:
-                escaped_attrs[key] = self.unescape_attr(val)
-            else:
-                # e.g. "__select" -- yuck!
-                escaped_attrs[key] = self.unescape_attrs(val)
-        return escaped_attrs
-
-    def unknown_entityref(self, ref): self.handle_data("&%s;" % ref)
-    def unknown_charref(self, ref): self.handle_data("&#%s;" % ref)
-
-
-# HTMLParser.HTMLParser is recent, so live without it if it's not available
-# (also, htmllib.HTMLParser is much more tolerant of bad HTML)
-try:
-    import HTMLParser
-except ImportError:
-    class XHTMLCompatibleFormParser:
-        def __init__(self, entitydefs=None, encoding=DEFAULT_ENCODING):
-            raise ValueError("HTMLParser could not be imported")
-else:
-    class XHTMLCompatibleFormParser(_AbstractFormParser, HTMLParser.HTMLParser):
-        """Good for XHTML, bad for tolerance of incorrect HTML."""
-        # thanks to Michael Howitz for this!
-        def __init__(self, entitydefs=None, encoding=DEFAULT_ENCODING):
-            HTMLParser.HTMLParser.__init__(self)
-            _AbstractFormParser.__init__(self, entitydefs, encoding)
-
-        def start_option(self, attrs):
-            _AbstractFormParser._start_option(self, attrs)
-
-        def end_option(self):
-            _AbstractFormParser._end_option(self)
-
-        def handle_starttag(self, tag, attrs):
-            try:
-                method = getattr(self, "start_" + tag)
-            except AttributeError:
-                try:
-                    method = getattr(self, "do_" + tag)
-                except AttributeError:
-                    pass  # unknown tag
-                else:
-                    method(attrs)
-            else:
-                method(attrs)
-
-        def handle_endtag(self, tag):
-            try:
-                method = getattr(self, "end_" + tag)
-            except AttributeError:
-                pass  # unknown tag
-            else:
-                method()
-
-        def unescape(self, name):
-            # Use the entitydefs passed into constructor, not
-            # HTMLParser.HTMLParser's entitydefs.
-            return self.unescape_attr(name)
-
-        def unescape_attr_if_required(self, name):
-            return name  # HTMLParser.HTMLParser already did it
-        def unescape_attrs_if_required(self, attrs):
-            return attrs  # ditto
-
-import sgmllib
-# monkeypatch to fix http://www.python.org/sf/803422 :-(
-sgmllib.charref = re.compile("&#(x?[0-9a-fA-F]+)[^0-9a-fA-F]")
-class _AbstractSgmllibParser(_AbstractFormParser):
-    def do_option(self, attrs):
-        _AbstractFormParser._start_option(self, attrs)
-
-    def unescape_attr_if_required(self, name):
-        return self.unescape_attr(name)
-    def unescape_attrs_if_required(self, attrs):
-        return self.unescape_attrs(attrs)
-
-class FormParser(_AbstractSgmllibParser, sgmllib.SGMLParser):
-    """Good for tolerance of incorrect HTML, bad for XHTML."""
-    def __init__(self, entitydefs=None, encoding=DEFAULT_ENCODING):
-        sgmllib.SGMLParser.__init__(self)
-        _AbstractFormParser.__init__(self, entitydefs, encoding)
-
-try:
-    if sys.version_info[:2] < (2, 2):
-        raise ImportError  # BeautifulSoup uses generators
-    import BeautifulSoup
-except ImportError:
-    pass
-else:
-    class _AbstractBSFormParser(_AbstractSgmllibParser):
-        bs_base_class = None
-        def __init__(self, entitydefs=None, encoding=DEFAULT_ENCODING):
-            _AbstractFormParser.__init__(self, entitydefs, encoding)
-            self.bs_base_class.__init__(self)
-        def handle_data(self, data):
-            _AbstractFormParser.handle_data(self, data)
-            self.bs_base_class.handle_data(self, data)
-
-    class RobustFormParser(_AbstractBSFormParser, BeautifulSoup.BeautifulSoup):
-        """Tries to be highly tolerant of incorrect HTML."""
-        bs_base_class = BeautifulSoup.BeautifulSoup
-    class NestingRobustFormParser(_AbstractBSFormParser,
-                                  BeautifulSoup.ICantBelieveItsBeautifulSoup):
-        """Tries to be highly tolerant of incorrect HTML.
-
-        Different from RobustFormParser in that it more often guesses nesting
-        above missing end tags (see BeautifulSoup docs).
-
-        """
-        bs_base_class = BeautifulSoup.ICantBelieveItsBeautifulSoup
-
-#FormParser = XHTMLCompatibleFormParser  # testing hack
-#FormParser = RobustFormParser  # testing hack
-
-def ParseResponse(response, select_default=False,
-                  ignore_errors=False,  # ignored!
-                  form_parser_class=FormParser,
-                  request_class=urllib2.Request,
-                  entitydefs=None,
-                  backwards_compat=True,
-                  encoding=DEFAULT_ENCODING,
-                  ):
-    """Parse HTTP response and return a list of HTMLForm instances.
-
-    The return value of urllib2.urlopen can be conveniently passed to this
-    function as the response parameter.
-
-    ClientForm.ParseError is raised on parse errors.
-
-    response: file-like object (supporting read() method) with a method
-     geturl(), returning the URI of the HTTP response
-    select_default: for multiple-selection SELECT controls and RADIO controls,
-     pick the first item as the default if none are selected in the HTML
-    form_parser_class: class to instantiate and use to pass
-    request_class: class to return from .click() method (default is
-     urllib2.Request)
-    entitydefs: mapping like {"&amp;": "&", ...} containing HTML entity
-     definitions (a sensible default is used)
-    encoding: character encoding used for encoding numeric character references
-     when matching link text.  ClientForm does not attempt to find the encoding
-     in a META HTTP-EQUIV attribute in the document itself (mechanize, for
-     example, does do that and will pass the correct value to ClientForm using
-     this parameter).
-
-    backwards_compat: boolean that determines whether the returned HTMLForm
-     objects are backwards-compatible with old code.  If backwards_compat is
-     true:
-
-     - ClientForm 0.1 code will continue to work as before.
-
-     - Label searches that do not specify a nr (number or count) will always
-       get the first match, even if other controls match.  If
-       backwards_compat is False, label searches that have ambiguous results
-       will raise an AmbiguityError.
-
-     - Item label matching is done by strict string comparison rather than
-       substring matching.
-
-     - De-selecting individual list items is allowed even if the Item is
-       disabled.
-
-    The backwards_compat argument will be deprecated in a future release.
-
-    Pass a true value for select_default if you want the behaviour specified by
-    RFC 1866 (the HTML 2.0 standard), which is to select the first item in a
-    RADIO or multiple-selection SELECT control if none were selected in the
-    HTML.  Most browsers (including Microsoft Internet Explorer (IE) and
-    Netscape Navigator) instead leave all items unselected in these cases.  The
-    W3C HTML 4.0 standard leaves this behaviour undefined in the case of
-    multiple-selection SELECT controls, but insists that at least one RADIO
-    button should be checked at all times, in contradiction to browser
-    behaviour.
-
-    There is a choice of parsers.  ClientForm.XHTMLCompatibleFormParser (uses
-    HTMLParser.HTMLParser) works best for XHTML, ClientForm.FormParser (uses
-    sgmllib.SGMLParser) (the default) works better for ordinary grubby HTML.
-    Note that HTMLParser is only available in Python 2.2 and later.  You can
-    pass your own class in here as a hack to work around bad HTML, but at your
-    own risk: there is no well-defined interface.
-
-    """
-    return ParseFile(response, response.geturl(), select_default,
-                     False,
-                     form_parser_class,
-                     request_class,
-                     entitydefs,
-                     backwards_compat,
-                     encoding,
-                     )
-
-def ParseFile(file, base_uri, select_default=False,
-              ignore_errors=False,  # ignored!
-              form_parser_class=FormParser,
-              request_class=urllib2.Request,
-              entitydefs=None,
-              backwards_compat=True,
-              encoding=DEFAULT_ENCODING,
-              ):
-    """Parse HTML and return a list of HTMLForm instances.
-
-    ClientForm.ParseError is raised on parse errors.
-
-    file: file-like object (supporting read() method) containing HTML with zero
-     or more forms to be parsed
-    base_uri: the URI of the document (note that the base URI used to submit
-     the form will be that given in the BASE element if present, not that of
-     the document)
-
-    For the other arguments and further details, see ParseResponse.__doc__.
-
-    """
-    if backwards_compat:
-        deprecation("operating in backwards-compatibility mode")
-    fp = form_parser_class(entitydefs, encoding)
-    while 1:
-        data = file.read(CHUNK)
-        try:
-            fp.feed(data)
-        except ParseError, e:
-            e.base_uri = base_uri
-            raise
-        if len(data) != CHUNK: break
-    if fp.base is not None:
-        # HTML BASE element takes precedence over document URI
-        base_uri = fp.base
-    labels = []  # Label(label) for label in fp.labels]
-    id_to_labels = {}
-    for l in fp.labels:
-        label = Label(l)
-        labels.append(label)
-        for_id = l["for"]
-        coll = id_to_labels.get(for_id)
-        if coll is None:
-            id_to_labels[for_id] = [label]
-        else:
-            coll.append(label)
-    forms = []
-    for (name, action, method, enctype), attrs, controls in fp.forms:
-        if action is None:
-            action = base_uri
-        else:
-            action = urljoin(base_uri, action)
-        action = fp.unescape_attr_if_required(action)
-        name = fp.unescape_attr_if_required(name)
-        attrs = fp.unescape_attrs_if_required(attrs)
-        # would be nice to make HTMLForm class (form builder) pluggable
-        form = HTMLForm(
-            action, method, enctype, name, attrs, request_class,
-            forms, labels, id_to_labels, backwards_compat)
-        for ii in range(len(controls)):
-            type, name, attrs = controls[ii]
-            attrs = fp.unescape_attrs_if_required(attrs)
-            name = fp.unescape_attr_if_required(name)
-            # index=ii*10 allows ImageControl to return multiple ordered pairs
-            form.new_control(type, name, attrs, select_default=select_default,
-                             index=ii*10)
-        forms.append(form)
-    for form in forms:
-        form.fixup()
-    return forms
-
-
-class Label:
-    def __init__(self, attrs):
-        self.id = attrs.get("for")
-        self._text = attrs.get("__text").strip()
-        self._ctext = compress_text(self._text)
-        self.attrs = attrs
-        self._backwards_compat = False  # maintained by HTMLForm
-
-    def __getattr__(self, name):
-        if name == "text":
-            if self._backwards_compat:
-                return self._text
-            else:
-                return self._ctext
-        return getattr(Label, name)
-
-    def __setattr__(self, name, value):
-        if name == "text":
-            # don't see any need for this, so make it read-only
-            raise AttributeError("text attribute is read-only")
-        self.__dict__[name] = value
-
-    def __str__(self):
-        return "<Label(id=%r, text=%r)>" % (self.id, self.text)
-
-
-def _get_label(attrs):
-    text = attrs.get("__label")
-    if text is not None:
-        return Label(text)
-    else:
-        return None
-
-class Control:
-    """An HTML form control.
-
-    An HTMLForm contains a sequence of Controls.  The Controls in an HTMLForm
-    are accessed using the HTMLForm.find_control method or the
-    HTMLForm.controls attribute.
-
-    Control instances are usually constructed using the ParseFile /
-    ParseResponse functions.  If you use those functions, you can ignore the
-    rest of this paragraph.  A Control is only properly initialised after the
-    fixup method has been called.  In fact, this is only strictly necessary for
-    ListControl instances.  This is necessary because ListControls are built up
-    from ListControls each containing only a single item, and their initial
-    value(s) can only be known after the sequence is complete.
-
-    The types and values that are acceptable for assignment to the value
-    attribute are defined by subclasses.
-
-    If the disabled attribute is true, this represents the state typically
-    represented by browsers by 'greying out' a control.  If the disabled
-    attribute is true, the Control will raise AttributeError if an attempt is
-    made to change its value.  In addition, the control will not be considered
-    'successful' as defined by the W3C HTML 4 standard -- ie. it will
-    contribute no data to the return value of the HTMLForm.click* methods.  To
-    enable a control, set the disabled attribute to a false value.
-
-    If the readonly attribute is true, the Control will raise AttributeError if
-    an attempt is made to change its value.  To make a control writable, set
-    the readonly attribute to a false value.
-
-    All controls have the disabled and readonly attributes, not only those that
-    may have the HTML attributes of the same names.
-
-    On assignment to the value attribute, the following exceptions are raised:
-    TypeError, AttributeError (if the value attribute should not be assigned
-    to, because the control is disabled, for example) and ValueError.
-
-    If the name or value attributes are None, or the value is an empty list, or
-    if the control is disabled, the control is not successful.
-
-    Public attributes:
-
-    type: string describing type of control (see the keys of the
-     HTMLForm.type2class dictionary for the allowable values) (readonly)
-    name: name of control (readonly)
-    value: current value of control (subclasses may allow a single value, a
-     sequence of values, or either)
-    disabled: disabled state
-    readonly: readonly state
-    id: value of id HTML attribute
-
-    """
-    def __init__(self, type, name, attrs, index=None):
-        """
-        type: string describing type of control (see the keys of the
-         HTMLForm.type2class dictionary for the allowable values)
-        name: control name
-        attrs: HTML attributes of control's HTML element
-
-        """
-        raise NotImplementedError()
-
-    def add_to_form(self, form):
-        self._form = form
-        form.controls.append(self)
-
-    def fixup(self):
-        pass
-
-    def is_of_kind(self, kind):
-        raise NotImplementedError()
-
-    def clear(self):
-        raise NotImplementedError()
-
-    def __getattr__(self, name): raise NotImplementedError()
-    def __setattr__(self, name, value): raise NotImplementedError()
-
-    def pairs(self):
-        """Return list of (key, value) pairs suitable for passing to urlencode.
-        """
-        return [(k, v) for (i, k, v) in self._totally_ordered_pairs()]
-
-    def _totally_ordered_pairs(self):
-        """Return list of (key, value, index) tuples.
-
-        Like pairs, but allows preserving correct ordering even where several
-        controls are involved.
-
-        """
-        raise NotImplementedError()
-
-    def _write_mime_data(self, mw, name, value):
-        """Write data for a subitem of this control to a MimeWriter."""
-        # called by HTMLForm
-        mw2 = mw.nextpart()
-        mw2.addheader("Content-disposition",
-                      'form-data; name="%s"' % name, 1)
-        f = mw2.startbody(prefix=0)
-        f.write(value)
-
-    def __str__(self):
-        raise NotImplementedError()
-
-    def get_labels(self):
-        """Return all labels (Label instances) for this control.
-        
-        If the control was surrounded by a <label> tag, that will be the first
-        label; all other labels, connected by 'for' and 'id', are in the order
-        that appear in the HTML.
-
-        """
-        res = []
-        if self._label:
-            res.append(self._label)
-        if self.id:
-            res.extend(self._form._id_to_labels.get(self.id, ()))
-        return res
-
-
-#---------------------------------------------------
-class ScalarControl(Control):
-    """Control whose value is not restricted to one of a prescribed set.
-
-    Some ScalarControls don't accept any value attribute.  Otherwise, takes a
-    single value, which must be string-like.
-
-    Additional read-only public attribute:
-
-    attrs: dictionary mapping the names of original HTML attributes of the
-     control to their values
-
-    """
-    def __init__(self, type, name, attrs, index=None):
-        self._index = index
-        self._label = _get_label(attrs)
-        self.__dict__["type"] = type.lower()
-        self.__dict__["name"] = name
-        self._value = attrs.get("value")
-        self.disabled = attrs.has_key("disabled")
-        self.readonly = attrs.has_key("readonly")
-        self.id = attrs.get("id")
-
-        self.attrs = attrs.copy()
-
-        self._clicked = False
-
-    def __getattr__(self, name):
-        if name == "value":
-            return self.__dict__["_value"]
-        else:
-            raise AttributeError("%s instance has no attribute '%s'" %
-                                 (self.__class__.__name__, name))
-
-    def __setattr__(self, name, value):
-        if name == "value":
-            if not isstringlike(value):
-                raise TypeError("must assign a string")
-            elif self.readonly:
-                raise AttributeError("control '%s' is readonly" % self.name)
-            elif self.disabled:
-                raise AttributeError("control '%s' is disabled" % self.name)
-            self.__dict__["_value"] = value
-        elif name in ("name", "type"):
-            raise AttributeError("%s attribute is readonly" % name)
-        else:
-            self.__dict__[name] = value
-
-    def _totally_ordered_pairs(self):
-        name = self.name
-        value = self.value
-        if name is None or value is None or self.disabled:
-            return []
-        return [(self._index, name, value)]
-
-    def clear(self):
-        if self.readonly:
-            raise AttributeError("control '%s' is readonly" % self.name)
-        self.__dict__["_value"] = None
-
-    def __str__(self):
-        name = self.name
-        value = self.value
-        if name is None: name = "<None>"
-        if value is None: value = "<None>"
-
-        infos = []
-        if self.disabled: infos.append("disabled")
-        if self.readonly: infos.append("readonly")
-        info = ", ".join(infos)
-        if info: info = " (%s)" % info
-
-        return "<%s(%s=%s)%s>" % (self.__class__.__name__, name, value, info)
-
-
-#---------------------------------------------------
-class TextControl(ScalarControl):
-    """Textual input control.
-
-    Covers:
-
-    INPUT/TEXT
-    INPUT/PASSWORD
-    INPUT/HIDDEN
-    TEXTAREA
-
-    """
-    def __init__(self, type, name, attrs, index=None):
-        ScalarControl.__init__(self, type, name, attrs, index)
-        if self.type == "hidden": self.readonly = True
-        if self._value is None:
-            self._value = ""
-
-    def is_of_kind(self, kind): return kind == "text"
-
-#---------------------------------------------------
-class FileControl(ScalarControl):
-    """File upload with INPUT TYPE=FILE.
-
-    The value attribute of a FileControl is always None.  Use add_file instead.
-
-    Additional public method: add_file
-
-    """
-
-    def __init__(self, type, name, attrs, index=None):
-        ScalarControl.__init__(self, type, name, attrs, index)
-        self._value = None
-        self._upload_data = []
-
-    def is_of_kind(self, kind): return kind == "file"
-
-    def clear(self):
-        if self.readonly:
-            raise AttributeError("control '%s' is readonly" % self.name)
-        self._upload_data = []
-
-    def __setattr__(self, name, value):
-        if name in ("value", "name", "type"):
-            raise AttributeError("%s attribute is readonly" % name)
-        else:
-            self.__dict__[name] = value
-
-    def add_file(self, file_object, content_type=None, filename=None):
-        if not hasattr(file_object, "read"):
-            raise TypeError("file-like object must have read method")
-        if content_type is not None and not isstringlike(content_type):
-            raise TypeError("content type must be None or string-like")
-        if filename is not None and not isstringlike(filename):
-            raise TypeError("filename must be None or string-like")
-        if content_type is None:
-            content_type = "application/octet-stream"
-        self._upload_data.append((file_object, content_type, filename))
-
-    def _totally_ordered_pairs(self):
-        # XXX should it be successful even if unnamed?
-        if self.name is None or self.disabled:
-            return []
-        return [(self._index, self.name, "")]
-
-    def _write_mime_data(self, mw, _name, _value):
-        # called by HTMLForm
-        # assert _name == self.name and _value == ''
-        if len(self._upload_data) == 1:
-            # single file
-            file_object, content_type, filename = self._upload_data[0]
-            mw2 = mw.nextpart()
-            fn_part = filename and ('; filename="%s"' % filename) or ""
-            disp = 'form-data; name="%s"%s' % (self.name, fn_part)
-            mw2.addheader("Content-disposition", disp, prefix=1)
-            fh = mw2.startbody(content_type, prefix=0)
-            fh.write(file_object.read())
-        elif len(self._upload_data) != 0:
-            # multiple files
-            mw2 = mw.nextpart()
-            disp = 'form-data; name="%s"' % self.name
-            mw2.addheader("Content-disposition", disp, prefix=1)
-            fh = mw2.startmultipartbody("mixed", prefix=0)
-            for file_object, content_type, filename in self._upload_data:
-                mw3 = mw2.nextpart()
-                fn_part = filename and ('; filename="%s"' % filename) or ""
-                disp = "file%s" % fn_part
-                mw3.addheader("Content-disposition", disp, prefix=1)
-                fh2 = mw3.startbody(content_type, prefix=0)
-                fh2.write(file_object.read())
-            mw2.lastpart()
-
-    def __str__(self):
-        name = self.name
-        if name is None: name = "<None>"
-
-        if not self._upload_data:
-            value = "<No files added>"
-        else:
-            value = []
-            for file, ctype, filename in self._upload_data:
-                if filename is None:
-                    value.append("<Unnamed file>")
-                else:
-                    value.append(filename)
-            value = ", ".join(value)
-
-        info = []
-        if self.disabled: info.append("disabled")
-        if self.readonly: info.append("readonly")
-        info = ", ".join(info)
-        if info: info = " (%s)" % info
-
-        return "<%s(%s=%s)%s>" % (self.__class__.__name__, name, value, info)
-
-
-#---------------------------------------------------
-class IsindexControl(ScalarControl):
-    """ISINDEX control.
-
-    ISINDEX is the odd-one-out of HTML form controls.  In fact, it isn't really
-    part of regular HTML forms at all, and predates it.  You're only allowed
-    one ISINDEX per HTML document.  ISINDEX and regular form submission are
-    mutually exclusive -- either submit a form, or the ISINDEX.
-
-    Having said this, since ISINDEX controls may appear in forms (which is
-    probably bad HTML), ParseFile / ParseResponse will include them in the
-    HTMLForm instances it returns.  You can set the ISINDEX's value, as with
-    any other control (but note that ISINDEX controls have no name, so you'll
-    need to use the type argument of set_value!).  When you submit the form,
-    the ISINDEX will not be successful (ie., no data will get returned to the
-    server as a result of its presence), unless you click on the ISINDEX
-    control, in which case the ISINDEX gets submitted instead of the form:
-
-    form.set_value("my isindex value", type="isindex")
-    urllib2.urlopen(form.click(type="isindex"))
-
-    ISINDEX elements outside of FORMs are ignored.  If you want to submit one
-    by hand, do it like so:
-
-    url = urlparse.urljoin(page_uri, "?"+urllib.quote_plus("my isindex value"))
-    result = urllib2.urlopen(url)
-
-    """
-    def __init__(self, type, name, attrs, index=None):
-        ScalarControl.__init__(self, type, name, attrs, index)
-        if self._value is None:
-            self._value = ""
-
-    def is_of_kind(self, kind): return kind in ["text", "clickable"]
-
-    def _totally_ordered_pairs(self):
-        return []
-
-    def _click(self, form, coord, return_type, request_class=urllib2.Request):
-        # Relative URL for ISINDEX submission: instead of "foo=bar+baz",
-        # want "bar+baz".
-        # This doesn't seem to be specified in HTML 4.01 spec. (ISINDEX is
-        # deprecated in 4.01, but it should still say how to submit it).
-        # Submission of ISINDEX is explained in the HTML 3.2 spec, though.
-        parts = urlparse.urlparse(form.action)
-        rest, (query, frag) = parts[:-2], parts[-2:]
-        parts = rest + (urllib.quote_plus(self.value), "")
-        url = urlparse.urlunparse(parts)
-        req_data = url, None, []
-
-        if return_type == "pairs":
-            return []
-        elif return_type == "request_data":
-            return req_data
-        else:
-            return request_class(url)
-
-    def __str__(self):
-        value = self.value
-        if value is None: value = "<None>"
-
-        infos = []
-        if self.disabled: infos.append("disabled")
-        if self.readonly: infos.append("readonly")
-        info = ", ".join(infos)
-        if info: info = " (%s)" % info
-
-        return "<%s(%s)%s>" % (self.__class__.__name__, value, info)
-
-
-#---------------------------------------------------
-class IgnoreControl(ScalarControl):
-    """Control that we're not interested in.
-
-    Covers:
-
-    INPUT/RESET
-    BUTTON/RESET
-    INPUT/BUTTON
-    BUTTON/BUTTON
-
-    These controls are always unsuccessful, in the terminology of HTML 4 (ie.
-    they never require any information to be returned to the server).
-
-    BUTTON/BUTTON is used to generate events for script embedded in HTML.
-
-    The value attribute of IgnoreControl is always None.
-
-    """
-    def __init__(self, type, name, attrs, index=None):
-        ScalarControl.__init__(self, type, name, attrs, index)
-        self._value = None
-
-    def is_of_kind(self, kind): return False
-
-    def __setattr__(self, name, value):
-        if name == "value":
-            raise AttributeError(
-                "control '%s' is ignored, hence read-only" % self.name)
-        elif name in ("name", "type"):
-            raise AttributeError("%s attribute is readonly" % name)
-        else:
-            self.__dict__[name] = value
-
-
-#---------------------------------------------------
-# ListControls
-
-# helpers and subsidiary classes
-
-class Item:
-    def __init__(self, control, attrs, index=None):
-        label = _get_label(attrs)
-        self.__dict__.update({
-            "name": attrs["value"],
-            "_labels": label and [label] or [],
-            "attrs": attrs,
-            "_control": control,
-            "disabled": attrs.has_key("disabled"),
-            "_selected": False,
-            "id": attrs.get("id"),
-            "_index": index,
-            })
-        control.items.append(self)
-
-    def get_labels(self):
-        """Return all labels (Label instances) for this item.
-        
-        For items that represent radio buttons or checkboxes, if the item was
-        surrounded by a <label> tag, that will be the first label; all other
-        labels, connected by 'for' and 'id', are in the order that appear in
-        the HTML.
-        
-        For items that represent select options, if the option had a label
-        attribute, that will be the first label.  If the option has contents
-        (text within the option tags) and it is not the same as the label
-        attribute (if any), that will be a label.  There is nothing in the
-        spec to my knowledge that makes an option with an id unable to be the
-        target of a label's for attribute, so those are included, if any, for
-        the sake of consistency and completeness.
-
-        """
-        res = []
-        res.extend(self._labels)
-        if self.id:
-            res.extend(self._control._form._id_to_labels.get(self.id, ()))
-        return res
-
-    def __getattr__(self, name):
-        if name=="selected":
-            return self._selected
-        raise AttributeError(name)
-
-    def __setattr__(self, name, value):
-        if name == "selected":
-            self._control._set_selected_state(self, value)
-        elif name == "disabled":
-            self.__dict__["disabled"] = bool(value)
-        else:
-            raise AttributeError(name)
-
-    def __str__(self):
-        res = self.name
-        if self.selected:
-            res = "*" + res
-        if self.disabled:
-            res = "(%s)" % res
-        return res
-
-    def __repr__(self):
-        attrs = [("name", self.name), ("id", self.id)]+self.attrs.items()
-        return "<%s %s>" % (
-            self.__class__.__name__,
-            " ".join(["%s=%r" % (k, v) for k, v in attrs])
-            )
-
-def disambiguate(items, nr, **kwds):
-    msgs = []
-    for key, value in kwds.items():
-        msgs.append("%s=%r" % (key, value))
-    msg = " ".join(msgs)
-    if not items:
-        raise ItemNotFoundError(msg)
-    if nr is None:
-        if len(items) > 1:
-            raise AmbiguityError(msg)
-        nr = 0
-    if len(items) <= nr:
-        raise ItemNotFoundError(msg)
-    return items[nr]
-
-class ListControl(Control):
-    """Control representing a sequence of items.
-
-    The value attribute of a ListControl represents the successful list items
-    in the control.  The successful list items are those that are selected and
-    not disabled.
-
-    ListControl implements both list controls that take a length-1 value
-    (single-selection) and those that take length >1 values
-    (multiple-selection).
-
-    ListControls accept sequence values only.  Some controls only accept
-    sequences of length 0 or 1 (RADIO, and single-selection SELECT).
-    In those cases, ItemCountError is raised if len(sequence) > 1.  CHECKBOXes
-    and multiple-selection SELECTs (those having the "multiple" HTML attribute)
-    accept sequences of any length.
-
-    Note the following mistake:
-
-    control.value = some_value
-    assert control.value == some_value    # not necessarily true
-
-    The reason for this is that the value attribute always gives the list items
-    in the order they were listed in the HTML.
-
-    ListControl items can also be referred to by their labels instead of names.
-    Use the label argument to .get(), and the .set_value_by_label(),
-    .get_value_by_label() methods.
-
-    Note that, rather confusingly, though SELECT controls are represented in
-    HTML by SELECT elements (which contain OPTION elements, representing
-    individual list items), CHECKBOXes and RADIOs are not represented by *any*
-    element.  Instead, those controls are represented by a collection of INPUT
-    elements.  For example, this is a SELECT control, named "control1":
-
-    <select name="control1">
-     <option>foo</option>
-     <option value="1">bar</option>
-    </select>
-
-    and this is a CHECKBOX control, named "control2":
-
-    <input type="checkbox" name="control2" value="foo" id="cbe1">
-    <input type="checkbox" name="control2" value="bar" id="cbe2">
-
-    The id attribute of a CHECKBOX or RADIO ListControl is always that of its
-    first element (for example, "cbe1" above).
-
-
-    Additional read-only public attribute: multiple.
-
-    """
-
-    # ListControls are built up by the parser from their component items by
-    # creating one ListControl per item, consolidating them into a single
-    # master ListControl held by the HTMLForm:
-
-    # -User calls form.new_control(...)
-    # -Form creates Control, and calls control.add_to_form(self).
-    # -Control looks for a Control with the same name and type in the form,
-    #  and if it finds one, merges itself with that control by calling
-    #  control.merge_control(self).  The first Control added to the form, of
-    #  a particular name and type, is the only one that survives in the
-    #  form.
-    # -Form calls control.fixup for all its controls.  ListControls in the
-    #  form know they can now safely pick their default values.
-
-    # To create a ListControl without an HTMLForm, use:
-
-    # control.merge_control(new_control)
-
-    # (actually, it's much easier just to use ParseFile)
-
-    _label = None
-
-    def __init__(self, type, name, attrs={}, select_default=False,
-                 called_as_base_class=False, index=None):
-        """
-        select_default: for RADIO and multiple-selection SELECT controls, pick
-         the first item as the default if no 'selected' HTML attribute is
-         present
-
-        """
-        if not called_as_base_class:
-            raise NotImplementedError()
-
-        self.__dict__["type"] = type.lower()
-        self.__dict__["name"] = name
-        self._value = attrs.get("value")
-        self.disabled = False
-        self.readonly = False
-        self.id = attrs.get("id")
-
-        # As Controls are merged in with .merge_control(), self.attrs will
-        # refer to each Control in turn -- always the most recently merged
-        # control.  Each merged-in Control instance corresponds to a single
-        # list item: see ListControl.__doc__.
-        self.items = []
-        self._form = None
-
-        self._select_default = select_default
-        self._clicked = False
-
-    def clear(self):
-        self.value = []
-
-    def is_of_kind(self, kind):
-        if kind  == "list":
-            return True
-        elif kind == "multilist":
-            return bool(self.multiple)
-        elif kind == "singlelist":
-            return not self.multiple
-        else:
-            return False
-
-    def get_items(self, name=None, label=None, id=None,
-                  exclude_disabled=False):
-        """Return matching items by name or label.
-
-        For argument docs, see the docstring for .get()
-
-        """
-        if name is not None and not isstringlike(name):
-            raise TypeError("item name must be string-like")
-        if label is not None and not isstringlike(label):
-            raise TypeError("item label must be string-like")
-        if id is not None and not isstringlike(id):
-            raise TypeError("item id must be string-like")
-        items = []  # order is important
-        compat = self._form.backwards_compat
-        for o in self.items:
-            if exclude_disabled and o.disabled:
-                continue
-            if name is not None and o.name != name:
-                continue
-            if label is not None:
-                for l in o.get_labels():
-                    if ((compat and l.text == label) or
-                        (not compat and l.text.find(label) > -1)):
-                        break
-                else:
-                    continue
-            if id is not None and o.id != id:
-                continue
-            items.append(o)
-        return items
-
-    def get(self, name=None, label=None, id=None, nr=None,
-            exclude_disabled=False):
-        """Return item by name or label, disambiguating if necessary with nr.
-
-        All arguments must be passed by name, with the exception of 'name',
-        which may be used as a positional argument.
-
-        If name is specified, then the item must have the indicated name.
-
-        If label is specified, then the item must have a label whose
-        whitespace-compressed, stripped, text substring-matches the indicated
-        label string (eg. label="please choose" will match
-        "  Do  please  choose an item ").
-
-        If id is specified, then the item must have the indicated id.
-
-        nr is an optional 0-based index of the items matching the query.
-
-        If nr is the default None value and more than item is found, raises
-        AmbiguityError (unless the HTMLForm instance's backwards_compat
-        attribute is true).
-
-        If no item is found, or if items are found but nr is specified and not
-        found, raises ItemNotFoundError.
-
-        Optionally excludes disabled items.
-
-        """
-        if nr is None and self._form.backwards_compat:
-            nr = 0  # :-/
-        items = self.get_items(name, label, id, exclude_disabled)
-        return disambiguate(items, nr, name=name, label=label, id=id)
-
-    def _get(self, name, by_label=False, nr=None, exclude_disabled=False):
-        # strictly for use by deprecated methods
-        if by_label:
-            name, label = None, name
-        else:
-            name, label = name, None
-        return self.get(name, label, nr, exclude_disabled)
-
-    def toggle(self, name, by_label=False, nr=None):
-        """Deprecated: given a name or label and optional disambiguating index
-        nr, toggle the matching item's selection.
-
-        Selecting items follows the behavior described in the docstring of the
-        'get' method.
-
-        if the item is disabled, or this control is disabled or readonly,
-        raise AttributeError.
-
-        """
-        deprecation(
-            "item = control.get(...); item.selected = not item.selected")
-        o = self._get(name, by_label, nr)
-        self._set_selected_state(o, not o.selected)
-
-    def set(self, selected, name, by_label=False, nr=None):
-        """Deprecated: given a name or label and optional disambiguating index
-        nr, set the matching item's selection to the bool value of selected.
-
-        Selecting items follows the behavior described in the docstring of the
-        'get' method.
-
-        if the item is disabled, or this control is disabled or readonly,
-        raise AttributeError.
-
-        """
-        deprecation(
-            "control.get(...).selected = <boolean>")
-        self._set_selected_state(self._get(name, by_label, nr), selected)
-
-    def _set_selected_state(self, item, action):
-        # action:
-        # bool False: off
-        # bool True: on
-        if self.disabled:
-            raise AttributeError("control '%s' is disabled" % self.name)
-        if self.readonly:
-            raise AttributeError("control '%s' is readonly" % self.name)
-        action == bool(action)
-        compat = self._form.backwards_compat
-        if not compat and item.disabled:
-            raise AttributeError("item is disabled")
-        else:
-            if compat and item.disabled and action:
-                raise AttributeError("item is disabled")
-            if self.multiple:
-                item.__dict__["_selected"] = action
-            else:
-                if not action:
-                    item.__dict__["_selected"] = False
-                else:
-                    for o in self.items:
-                        o.__dict__["_selected"] = False
-                    item.__dict__["_selected"] = True
-
-    def toggle_single(self, by_label=None):
-        """Deprecated: toggle the selection of the single item in this control.
-        
-        Raises ItemCountError if the control does not contain only one item.
-        
-        by_label argument is ignored, and included only for backwards
-        compatibility.
-
-        """
-        deprecation(
-            "control.items[0].selected = not control.items[0].selected")
-        if len(self.items) != 1:
-            raise ItemCountError(
-                "'%s' is not a single-item control" % self.name)
-        item = self.items[0]
-        self._set_selected_state(item, not item.selected)
-
-    def set_single(self, selected, by_label=None):
-        """Deprecated: set the selection of the single item in this control.
-        
-        Raises ItemCountError if the control does not contain only one item.
-        
-        by_label argument is ignored, and included only for backwards
-        compatibility.
-
-        """
-        deprecation(
-            "control.items[0].selected = <boolean>")
-        if len(self.items) != 1:
-            raise ItemCountError(
-                "'%s' is not a single-item control" % self.name)
-        self._set_selected_state(self.items[0], selected)
-
-    def get_item_disabled(self, name, by_label=False, nr=None):
-        """Get disabled state of named list item in a ListControl."""
-        deprecation(
-            "control.get(...).disabled")
-        return self._get(name, by_label, nr).disabled
-
-    def set_item_disabled(self, disabled, name, by_label=False, nr=None):
-        """Set disabled state of named list item in a ListControl.
-
-        disabled: boolean disabled state
-
-        """
-        deprecation(
-            "control.get(...).disabled = <boolean>")
-        self._get(name, by_label, nr).disabled = disabled
-
-    def set_all_items_disabled(self, disabled):
-        """Set disabled state of all list items in a ListControl.
-
-        disabled: boolean disabled state
-
-        """
-        for o in self.items:
-            o.disabled = disabled
-
-    def get_item_attrs(self, name, by_label=False, nr=None):
-        """Return dictionary of HTML attributes for a single ListControl item.
-
-        The HTML element types that describe list items are: OPTION for SELECT
-        controls, INPUT for the rest.  These elements have HTML attributes that
-        you may occasionally want to know about -- for example, the "alt" HTML
-        attribute gives a text string describing the item (graphical browsers
-        usually display this as a tooltip).
-
-        The returned dictionary maps HTML attribute names to values.  The names
-        and values are taken from the original HTML.
-
-        """
-        deprecation(
-            "control.get(...).attrs")
-        return self._get(name, by_label, nr).attrs
-
-    def add_to_form(self, form):
-        assert self._form is None or form == self._form, (
-            "can't add control to more than one form")
-        self._form = form
-        try:
-            control = form.find_control(self.name, self.type)
-        except ControlNotFoundError:
-            Control.add_to_form(self, form)
-        else:
-            control.merge_control(self)
-
-    def merge_control(self, control):
-        assert bool(control.multiple) == bool(self.multiple)
-        # usually, isinstance(control, self.__class__)
-        self.items.extend(control.items)
-
-    def fixup(self):
-        """
-        ListControls are built up from component list items (which are also
-        ListControls) during parsing.  This method should be called after all
-        items have been added.  See ListControl.__doc__ for the reason this is
-        required.
-
-        """
-        # Need to set default selection where no item was indicated as being
-        # selected by the HTML:
-
-        # CHECKBOX:
-        #  Nothing should be selected.
-        # SELECT/single, SELECT/multiple and RADIO:
-        #  RFC 1866 (HTML 2.0): says first item should be selected.
-        #  W3C HTML 4.01 Specification: says that client behaviour is
-        #   undefined in this case.  For RADIO, exactly one must be selected,
-        #   though which one is undefined.
-        #  Both Netscape and Microsoft Internet Explorer (IE) choose first
-        #   item for SELECT/single.  However, both IE5 and Mozilla (both 1.0
-        #   and Firebird 0.6) leave all items unselected for RADIO and
-        #   SELECT/multiple.
-
-        # Since both Netscape and IE all choose the first item for
-        # SELECT/single, we do the same.  OTOH, both Netscape and IE
-        # leave SELECT/multiple with nothing selected, in violation of RFC 1866
-        # (but not in violation of the W3C HTML 4 standard); the same is true
-        # of RADIO (which *is* in violation of the HTML 4 standard).  We follow
-        # RFC 1866 if the _select_default attribute is set, and Netscape and IE
-        # otherwise.  RFC 1866 and HTML 4 are always violated insofar as you
-        # can deselect all items in a RadioControl.
-        
-        for o in self.items: 
-            # set items' controls to self, now that we've merged
-            o.__dict__["_control"] = self
-
-    def __getattr__(self, name):
-        if name == "value":
-            compat = self._form.backwards_compat
-            return [o.name for o in self.items if o.selected and
-                    (not o.disabled or compat)]
-        else:
-            raise AttributeError("%s instance has no attribute '%s'" %
-                                 (self.__class__.__name__, name))
-
-    def __setattr__(self, name, value):
-        if name == "value":
-            if self.disabled:
-                raise AttributeError("control '%s' is disabled" % self.name)
-            if self.readonly:
-                raise AttributeError("control '%s' is readonly" % self.name)
-            self._set_value(value)
-        elif name in ("name", "type", "multiple"):
-            raise AttributeError("%s attribute is readonly" % name)
-        else:
-            self.__dict__[name] = value
-
-    def _set_value(self, value):
-        if value is None or isstringlike(value):
-            raise TypeError("ListControl, must set a sequence")
-        if not value:
-            compat = self._form.backwards_compat
-            for o in self.items:
-                if not o.disabled or compat:
-                    o.selected = False
-        elif self.multiple:
-            self._multiple_set_value(value)
-        elif len(value) > 1:
-            raise ItemCountError(
-                "single selection list, must set sequence of "
-                "length 0 or 1")
-        else:
-            self._single_set_value(value)
-
-    def _get_items(self, name, target=1):
-        all_items = self.get_items(name)
-        items = [o for o in all_items if not o.disabled]
-        if len(items) < target:
-            if len(all_items) < target:
-                raise ItemNotFoundError(
-                    "insufficient items with name %r" % name)
-            else:
-                raise AttributeError(
-                    "insufficient non-disabled items with name %s" % name)
-        on = []
-        off = []
-        for o in items:
-            if o.selected:
-                on.append(o)
-            else:
-                off.append(o)
-        return on, off
-
-    def _single_set_value(self, value):
-        assert len(value) == 1
-        on, off = self._get_items(value[0])
-        assert len(on) <= 1
-        if not on:
-            off[0].selected = True
-
-    def _multiple_set_value(self, value):
-        compat = self._form.backwards_compat
-        turn_on = []  # transactional-ish
-        turn_off = [item for item in self.items if
-                    item.selected and (not item.disabled or compat)]
-        names = {}
-        for nn in value:
-            if nn in names.keys():
-                names[nn] += 1
-            else:
-                names[nn] = 1
-        for name, count in names.items():
-            on, off = self._get_items(name, count)
-            for i in range(count):
-                if on:
-                    item = on[0]
-                    del on[0]
-                    del turn_off[turn_off.index(item)]
-                else:
-                    item = off[0]
-                    del off[0]
-                    turn_on.append(item)
-        for item in turn_off:
-            item.selected = False
-        for item in turn_on:
-            item.selected = True
-
-    def set_value_by_label(self, value):
-        """Set the value of control by item labels.
-
-        value is expected to be an iterable of strings that are substrings of
-        the item labels that should be selected.  Before substring matching is
-        performed, the original label text is whitespace-compressed
-        (consecutive whitespace characters are converted to a single space
-        character) and leading and trailing whitespace is stripped.  Ambiguous
-        labels are accepted without complaint if the form's backwards_compat is
-        True; otherwise, it will not complain as long as all ambiguous labels
-        share the same item name (e.g. OPTION value).
-
-        """
-        if isstringlike(value):
-            raise TypeError(value)
-        if not self.multiple and len(value) > 1:
-            raise ItemCountError(
-                "single selection list, must set sequence of "
-                "length 0 or 1")
-        items = []
-        for nn in value:
-            found = self.get_items(label=nn)
-            if len(found) > 1:
-                if not self._form.backwards_compat:
-                    # ambiguous labels are fine as long as item names (e.g.
-                    # OPTION values) are same
-                    opt_name = found[0].name
-                    if [o for o in found[1:] if o.name != opt_name]:
-                        raise AmbiguityError(nn)
-                else:
-                    # OK, we'll guess :-(  Assume first available item.
-                    found = found[:1]
-            for o in found:
-                # For the multiple-item case, we could try to be smarter,
-                # saving them up and trying to resolve, but that's too much.
-                if self._form.backwards_compat or o not in items:
-                    items.append(o)
-                    break
-            else:  # all of them are used
-                raise ItemNotFoundError(nn)
-        # now we have all the items that should be on
-        # let's just turn everything off and then back on.
-        self.value = []
-        for o in items:
-            o.selected = True
-
-    def get_value_by_label(self):
-        """Return the value of the control as given by normalized labels."""
-        res = []
-        compat = self._form.backwards_compat
-        for o in self.items:
-            if (not o.disabled or compat) and o.selected:
-                for l in o.get_labels():
-                    if l.text:
-                        res.append(l.text)
-                        break
-                else:
-                    res.append(None)
-        return res
-
-    def possible_items(self, by_label=False):
-        """Deprecated: return the names or labels of all possible items.
-
-        Includes disabled items, which may be misleading for some use cases.
-
-        """
-        deprecation(
-            "[item.name for item in self.items]")
-        if by_label:
-            res = []
-            for o in self.items:
-                for l in o.get_labels():
-                    if l.text:
-                        res.append(l.text)
-                        break
-                else:
-                    res.append(None)
-            return res
-        return [o.name for o in self.items]
-
-    def _totally_ordered_pairs(self):
-        if self.disabled:
-            return []
-        else:
-            return [(o._index, self.name, o.name) for o in self.items
-                    if o.selected and not o.disabled]
-
-    def __str__(self):
-        name = self.name
-        if name is None: name = "<None>"
-
-        display = [str(o) for o in self.items]
-
-        infos = []
-        if self.disabled: infos.append("disabled")
-        if self.readonly: infos.append("readonly")
-        info = ", ".join(infos)
-        if info: info = " (%s)" % info
-
-        return "<%s(%s=[%s])%s>" % (self.__class__.__name__,
-                                    name, ", ".join(display), info)
-
-
-class RadioControl(ListControl):
-    """
-    Covers:
-
-    INPUT/RADIO
-
-    """
-    def __init__(self, type, name, attrs, select_default=False, index=None):
-        attrs.setdefault("value", "on")
-        ListControl.__init__(self, type, name, attrs, select_default,
-                             called_as_base_class=True, index=index)
-        self.__dict__["multiple"] = False
-        o = Item(self, attrs, index)
-        o.__dict__["_selected"] = attrs.has_key("checked")
-
-    def fixup(self):
-        ListControl.fixup(self)
-        found = [o for o in self.items if o.selected and not o.disabled]
-        if not found:
-            if self._select_default:
-                for o in self.items:
-                    if not o.disabled:
-                        o.selected = True
-                        break
-        else:
-            # Ensure only one item selected.  Choose the last one,
-            # following IE and Firefox.
-            for o in found[:-1]:
-                o.selected = False
-
-    def get_labels(self):
-        return []
-
-class CheckboxControl(ListControl):
-    """
-    Covers:
-
-    INPUT/CHECKBOX
-
-    """
-    def __init__(self, type, name, attrs, select_default=False, index=None):
-        attrs.setdefault("value", "on")
-        ListControl.__init__(self, type, name, attrs, select_default,
-                             called_as_base_class=True, index=index)
-        self.__dict__["multiple"] = True
-        o = Item(self, attrs, index)
-        o.__dict__["_selected"] = attrs.has_key("checked")
-
-    def get_labels(self):
-        return []
-
-
-class SelectControl(ListControl):
-    """
-    Covers:
-
-    SELECT (and OPTION)
-
-
-    OPTION 'values', in HTML parlance, are Item 'names' in ClientForm parlance.
-
-
-    OPTION 'values', in HTML parlance, are Item 'names' in ClientForm parlance.
-
-    SELECT control values and labels are subject to some messy defaulting
-    rules.  For example, if the HTML representation of the control is:
-
-    <SELECT name=year>
-      <OPTION value=0 label="2002">current year</OPTION>
-      <OPTION value=1>2001</OPTION>
-      <OPTION>2000</OPTION>
-    </SELECT>
-
-    The items, in order, have labels "2002", "2001" and "2000", whereas their
-    names (the OPTION values) are "0", "1" and "2000" respectively.  Note that
-    the value of the last OPTION in this example defaults to its contents, as
-    specified by RFC 1866, as do the labels of the second and third OPTIONs.
-
-    The OPTION labels are sometimes more meaningful than the OPTION values,
-    which can make for more maintainable code.
-
-    Additional read-only public attribute: attrs
-
-    The attrs attribute is a dictionary of the original HTML attributes of the
-    SELECT element.  Other ListControls do not have this attribute, because in
-    other cases the control as a whole does not correspond to any single HTML
-    element.  control.get(...).attrs may be used as usual to get at the HTML
-    attributes of the HTML elements corresponding to individual list items (for
-    SELECT controls, these are OPTION elements).
-
-    Another special case is that the Item.attrs dictionaries have a special key
-    "contents" which does not correspond to any real HTML attribute, but rather
-    contains the contents of the OPTION element:
-
-    <OPTION>this bit</OPTION>
-
-    """
-    # HTML attributes here are treated slightly differently from other list
-    # controls:
-    # -The SELECT HTML attributes dictionary is stuffed into the OPTION
-    #  HTML attributes dictionary under the "__select" key.
-    # -The content of each OPTION element is stored under the special
-    #  "contents" key of the dictionary.
-    # After all this, the dictionary is passed to the SelectControl constructor
-    # as the attrs argument, as usual.  However:
-    # -The first SelectControl constructed when building up a SELECT control
-    #  has a constructor attrs argument containing only the __select key -- so
-    #  this SelectControl represents an empty SELECT control.
-    # -Subsequent SelectControls have both OPTION HTML-attribute in attrs and
-    #  the __select dictionary containing the SELECT HTML-attributes.
-
-    def __init__(self, type, name, attrs, select_default=False, index=None):
-        # fish out the SELECT HTML attributes from the OPTION HTML attributes
-        # dictionary
-        self.attrs = attrs["__select"].copy()
-        self.__dict__["_label"] = _get_label(self.attrs)
-        self.__dict__["id"] = self.attrs.get("id")
-        self.__dict__["multiple"] = self.attrs.has_key("multiple")
-        # the majority of the contents, label, and value dance already happened
-        contents = attrs.get("contents")
-        attrs = attrs.copy()
-        del attrs["__select"]
-
-        ListControl.__init__(self, type, name, self.attrs, select_default,
-                             called_as_base_class=True, index=index)
-        self.disabled = self.attrs.has_key("disabled")
-        self.readonly = self.attrs.has_key("readonly")
-        if attrs.has_key("value"):
-            # otherwise it is a marker 'select started' token
-            o = Item(self, attrs, index)
-            o.__dict__["_selected"] = attrs.has_key("selected")
-            # add 'label' label and contents label, if different.  If both are
-            # provided, the 'label' label is used for display in HTML 
-            # 4.0-compliant browsers (and any lower spec? not sure) while the
-            # contents are used for display in older or less-compliant
-            # browsers.  We make label objects for both, if the values are
-            # different.
-            label = attrs.get("label")
-            if label:
-                o._labels.append(Label({"__text": label}))
-                if contents and contents != label:
-                    o._labels.append(Label({"__text": contents}))
-            elif contents:
-                o._labels.append(Label({"__text": contents}))
-
-    def fixup(self):
-        ListControl.fixup(self)
-        # Firefox doesn't exclude disabled items from those considered here
-        # (i.e. from 'found', for both branches of the if below).  Note that
-        # IE6 doesn't support the disabled attribute on OPTIONs at all.
-        found = [o for o in self.items if o.selected]
-        if not found:
-            if not self.multiple or self._select_default:
-                for o in self.items:
-                    if not o.disabled:
-                        was_disabled = self.disabled
-                        self.disabled = False
-                        try:
-                            o.selected = True
-                        finally:
-                            o.disabled = was_disabled
-                        break
-        elif not self.multiple:
-            # Ensure only one item selected.  Choose the last one,
-            # following IE and Firefox.
-            for o in found[:-1]:
-                o.selected = False
-
-
-#---------------------------------------------------
-class SubmitControl(ScalarControl):
-    """
-    Covers:
-
-    INPUT/SUBMIT
-    BUTTON/SUBMIT
-
-    """
-    def __init__(self, type, name, attrs, index=None):
-        ScalarControl.__init__(self, type, name, attrs, index)
-        # IE5 defaults SUBMIT value to "Submit Query"; Firebird 0.6 leaves it
-        # blank, Konqueror 3.1 defaults to "Submit".  HTML spec. doesn't seem
-        # to define this.
-        if self.value is None: self.value = ""
-        self.readonly = True
-
-    def get_labels(self):
-        res = []
-        if self.value:
-            res.append(Label({"__text": self.value}))
-        res.extend(ScalarControl.get_labels(self))
-        return res
-
-    def is_of_kind(self, kind): return kind == "clickable"
-
-    def _click(self, form, coord, return_type, request_class=urllib2.Request):
-        self._clicked = coord
-        r = form._switch_click(return_type, request_class)
-        self._clicked = False
-        return r
-
-    def _totally_ordered_pairs(self):
-        if not self._clicked:
-            return []
-        return ScalarControl._totally_ordered_pairs(self)
-
-
-#---------------------------------------------------
-class ImageControl(SubmitControl):
-    """
-    Covers:
-
-    INPUT/IMAGE
-
-    Coordinates are specified using one of the HTMLForm.click* methods.
-
-    """
-    def __init__(self, type, name, attrs, index=None):
-        SubmitControl.__init__(self, type, name, attrs, index)
-        self.readonly = False
-
-    def _totally_ordered_pairs(self):
-        clicked = self._clicked
-        if self.disabled or not clicked:
-            return []
-        name = self.name
-        if name is None: return []
-        pairs = [
-            (self._index, "%s.x" % name, str(clicked[0])),
-            (self._index+1, "%s.y" % name, str(clicked[1])),
-            ]
-        value = self._value
-        if value:
-            pairs.append((self._index+2, name, value))
-        return pairs
-
-    get_labels = ScalarControl.get_labels
-
-# aliases, just to make str(control) and str(form) clearer
-class PasswordControl(TextControl): pass
-class HiddenControl(TextControl): pass
-class TextareaControl(TextControl): pass
-class SubmitButtonControl(SubmitControl): pass
-
-
-def is_listcontrol(control): return control.is_of_kind("list")
-
-
-class HTMLForm:
-    """Represents a single HTML <form> ... </form> element.
-
-    A form consists of a sequence of controls that usually have names, and
-    which can take on various values.  The values of the various types of
-    controls represent variously: text, zero-or-one-of-many or many-of-many
-    choices, and files to be uploaded.  Some controls can be clicked on to
-    submit the form, and clickable controls' values sometimes include the
-    coordinates of the click.
-
-    Forms can be filled in with data to be returned to the server, and then
-    submitted, using the click method to generate a request object suitable for
-    passing to urllib2.urlopen (or the click_request_data or click_pairs
-    methods if you're not using urllib2).
-
-    import ClientForm
-    forms = ClientForm.ParseFile(html, base_uri)
-    form = forms[0]
-
-    form["query"] = "Python"
-    form.find_control("nr_results").get("lots").selected = True
-
-    response = urllib2.urlopen(form.click())
-
-    Usually, HTMLForm instances are not created directly.  Instead, the
-    ParseFile or ParseResponse factory functions are used.  If you do construct
-    HTMLForm objects yourself, however, note that an HTMLForm instance is only
-    properly initialised after the fixup method has been called (ParseFile and
-    ParseResponse do this for you).  See ListControl.__doc__ for the reason
-    this is required.
-
-    Indexing a form (form["control_name"]) returns the named Control's value
-    attribute.  Assignment to a form index (form["control_name"] = something)
-    is equivalent to assignment to the named Control's value attribute.  If you
-    need to be more specific than just supplying the control's name, use the
-    set_value and get_value methods.
-
-    ListControl values are lists of item names (specifically, the names of the
-    items that are selected and not disabled, and hence are "successful" -- ie.
-    cause data to be returned to the server).  The list item's name is the
-    value of the corresponding HTML element's"value" attribute.
-
-    Example:
-
-      <INPUT type="CHECKBOX" name="cheeses" value="leicester"></INPUT>
-      <INPUT type="CHECKBOX" name="cheeses" value="cheddar"></INPUT>
-
-    defines a CHECKBOX control with name "cheeses" which has two items, named
-    "leicester" and "cheddar".
-
-    Another example:
-
-      <SELECT name="more_cheeses">
-        <OPTION>1</OPTION>
-        <OPTION value="2" label="CHEDDAR">cheddar</OPTION>
-      </SELECT>
-
-    defines a SELECT control with name "more_cheeses" which has two items,
-    named "1" and "2" (because the OPTION element's value HTML attribute
-    defaults to the element contents -- see SelectControl.__doc__ for more on
-    these defaulting rules).
-
-    To select, deselect or otherwise manipulate individual list items, use the
-    HTMLForm.find_control() and ListControl.get() methods.  To set the whole
-    value, do as for any other control: use indexing or the set_/get_value
-    methods.
-
-    Example:
-
-    # select *only* the item named "cheddar"
-    form["cheeses"] = ["cheddar"]
-    # select "cheddar", leave other items unaffected
-    form.find_control("cheeses").get("cheddar").selected = True
-
-    Some controls (RADIO and SELECT without the multiple attribute) can only
-    have zero or one items selected at a time.  Some controls (CHECKBOX and
-    SELECT with the multiple attribute) can have multiple items selected at a
-    time.  To set the whole value of a ListControl, assign a sequence to a form
-    index:
-
-    form["cheeses"] = ["cheddar", "leicester"]
-
-    If the ListControl is not multiple-selection, the assigned list must be of
-    length one.
-
-    To check if a control has an item, if an item is selected, or if an item is
-    successful (selected and not disabled), respectively:
-
-    "cheddar" in [item.name for item in form.find_control("cheeses").items]
-    "cheddar" in [item.name for item in form.find_control("cheeses").items and
-                  item.selected]
-    "cheddar" in form["cheeses"]  # (or "cheddar" in form.get_value("cheeses"))
-
-    Note that some list items may be disabled (see below).
-
-    Note the following mistake:
-
-    form[control_name] = control_value
-    assert form[control_name] == control_value  # not necessarily true
-
-    The reason for this is that form[control_name] always gives the list items
-    in the order they were listed in the HTML.
-
-    List items (hence list values, too) can be referred to in terms of list
-    item labels rather than list item names using the appropriate label
-    arguments.  Note that each item may have several labels.
-
-    The question of default values of OPTION contents, labels and values is
-    somewhat complicated: see SelectControl.__doc__ and
-    ListControl.get_item_attrs.__doc__ if you think you need to know.
-
-    Controls can be disabled or readonly.  In either case, the control's value
-    cannot be changed until you clear those flags (see example below).
-    Disabled is the state typically represented by browsers by 'greying out' a
-    control.  Disabled controls are not 'successful' -- they don't cause data
-    to get returned to the server.  Readonly controls usually appear in
-    browsers as read-only text boxes.  Readonly controls are successful.  List
-    items can also be disabled.  Attempts to select or deselect disabled items
-    fail with AttributeError.
-
-    If a lot of controls are readonly, it can be useful to do this:
-
-    form.set_all_readonly(False)
-
-    To clear a control's value attribute, so that it is not successful (until a
-    value is subsequently set):
-
-    form.clear("cheeses")
-
-    More examples:
-
-    control = form.find_control("cheeses")
-    control.disabled = False
-    control.readonly = False
-    control.get("gruyere").disabled = True
-    control.items[0].selected = True
-
-    See the various Control classes for further documentation.  Many methods
-    take name, type, kind, id, label and nr arguments to specify the control to
-    be operated on: see HTMLForm.find_control.__doc__.
-
-    ControlNotFoundError (subclass of ValueError) is raised if the specified
-    control can't be found.  This includes occasions where a non-ListControl
-    is found, but the method (set, for example) requires a ListControl.
-    ItemNotFoundError (subclass of ValueError) is raised if a list item can't
-    be found.  ItemCountError (subclass of ValueError) is raised if an attempt
-    is made to select more than one item and the control doesn't allow that, or
-    set/get_single are called and the control contains more than one item.
-    AttributeError is raised if a control or item is readonly or disabled and
-    an attempt is made to alter its value.
-
-    Security note: Remember that any passwords you store in HTMLForm instances
-    will be saved to disk in the clear if you pickle them (directly or
-    indirectly).  The simplest solution to this is to avoid pickling HTMLForm
-    objects.  You could also pickle before filling in any password, or just set
-    the password to "" before pickling.
-
-
-    Public attributes:
-
-    action: full (absolute URI) form action
-    method: "GET" or "POST"
-    enctype: form transfer encoding MIME type
-    name: name of form (None if no name was specified)
-    attrs: dictionary mapping original HTML form attributes to their values
-
-    controls: list of Control instances; do not alter this list
-     (instead, call form.new_control to make a Control and add it to the
-     form, or control.add_to_form if you already have a Control instance)
-
-
-
-    Methods for form filling:
-    -------------------------
-
-    Most of the these methods have very similar arguments.  See
-    HTMLForm.find_control.__doc__ for details of the name, type, kind, label
-    and nr arguments.
-
-    def find_control(self,
-                     name=None, type=None, kind=None, id=None, predicate=None,
-                     nr=None, label=None)
-
-    get_value(name=None, type=None, kind=None, id=None, nr=None,
-              by_label=False,  # by_label is deprecated
-              label=None)
-    set_value(value,
-              name=None, type=None, kind=None, id=None, nr=None,
-              by_label=False,  # by_label is deprecated
-              label=None)
-
-    clear_all()
-    clear(name=None, type=None, kind=None, id=None, nr=None, label=None)
-
-    set_all_readonly(readonly)
-
-
-    Method applying only to FileControls:
-
-    add_file(file_object,
-             content_type="application/octet-stream", filename=None,
-             name=None, id=None, nr=None, label=None)
-
-
-    Methods applying only to clickable controls:
-
-    click(name=None, type=None, id=None, nr=0, coord=(1,1), label=None)
-    click_request_data(name=None, type=None, id=None, nr=0, coord=(1,1),
-                       label=None)
-    click_pairs(name=None, type=None, id=None, nr=0, coord=(1,1), label=None)
-
-    """
-
-    type2class = {
-        "text": TextControl,
-        "password": PasswordControl,
-        "hidden": HiddenControl,
-        "textarea": TextareaControl,
-
-        "isindex": IsindexControl,
-
-        "file": FileControl,
-
-        "button": IgnoreControl,
-        "buttonbutton": IgnoreControl,
-        "reset": IgnoreControl,
-        "resetbutton": IgnoreControl,
-
-        "submit": SubmitControl,
-        "submitbutton": SubmitButtonControl,
-        "image": ImageControl,
-
-        "radio": RadioControl,
-        "checkbox": CheckboxControl,
-        "select": SelectControl,
-        }
-
-#---------------------------------------------------
-# Initialisation.  Use ParseResponse / ParseFile instead.
-
-    def __init__(self, action, method="GET",
-                 enctype="application/x-www-form-urlencoded",
-                 name=None, attrs=None,
-                 request_class=urllib2.Request,
-                 forms=None, labels=None, id_to_labels=None,
-                 backwards_compat=True):
-        """
-        In the usual case, use ParseResponse (or ParseFile) to create new
-        HTMLForm objects.
-
-        action: full (absolute URI) form action
-        method: "GET" or "POST"
-        enctype: form transfer encoding MIME type
-        name: name of form
-        attrs: dictionary mapping original HTML form attributes to their values
-
-        """
-        self.action = action
-        self.method = method
-        self.enctype = enctype
-        self.name = name
-        if attrs is not None:
-            self.attrs = attrs.copy()
-        else:
-            self.attrs = {}
-        self.controls = []
-        self._request_class = request_class
-
-        # these attributes are used by zope.testbrowser
-        self._forms = forms  # this is a semi-public API!
-        self._labels = labels  # this is a semi-public API!
-        self._id_to_labels = id_to_labels  # this is a semi-public API!
-
-        self.backwards_compat = backwards_compat  # note __setattr__
-
-    def __getattr__(self, name):
-        if name == "backwards_compat":
-            return self._backwards_compat
-        return getattr(HTMLForm, name)
-
-    def __setattr__(self, name, value):
-        # yuck
-        if name == "backwards_compat":
-            name = "_backwards_compat"
-            value = bool(value)
-            for cc in self.controls:
-                try:
-                    items = cc.items 
-                except AttributeError:
-                    continue
-                else:
-                    for ii in items:
-                        for ll in ii.get_labels():
-                            ll._backwards_compat = value
-        self.__dict__[name] = value
-
-    def new_control(self, type, name, attrs,
-                    ignore_unknown=False, select_default=False, index=None):
-        """Adds a new control to the form.
-
-        This is usually called by ParseFile and ParseResponse.  Don't call it
-        youself unless you're building your own Control instances.
-
-        Note that controls representing lists of items are built up from
-        controls holding only a single list item.  See ListControl.__doc__ for
-        further information.
-
-        type: type of control (see Control.__doc__ for a list)
-        attrs: HTML attributes of control
-        ignore_unknown: if true, use a dummy Control instance for controls of
-         unknown type; otherwise, use a TextControl
-        select_default: for RADIO and multiple-selection SELECT controls, pick
-         the first item as the default if no 'selected' HTML attribute is
-         present (this defaulting happens when the HTMLForm.fixup method is
-         called)
-        index: index of corresponding element in HTML (see
-         MoreFormTests.test_interspersed_controls for motivation)
-
-        """
-        type = type.lower()
-        klass = self.type2class.get(type)
-        if klass is None:
-            if ignore_unknown:
-                klass = IgnoreControl
-            else:
-                klass = TextControl
-
-        a = attrs.copy()
-        if issubclass(klass, ListControl):
-            control = klass(type, name, a, select_default, index)
-        else:
-            control = klass(type, name, a, index)
-        control.add_to_form(self)
-
-    def fixup(self):
-        """Normalise form after all controls have been added.
-
-        This is usually called by ParseFile and ParseResponse.  Don't call it
-        youself unless you're building your own Control instances.
-
-        This method should only be called once, after all controls have been
-        added to the form.
-
-        """
-        for control in self.controls:
-            control.fixup()
-        self.backwards_compat = self._backwards_compat
-
-#---------------------------------------------------
-    def __str__(self):
-        header = "%s%s %s %s" % (
-            (self.name and self.name+" " or ""),
-            self.method, self.action, self.enctype)
-        rep = [header]
-        for control in self.controls:
-            rep.append("  %s" % str(control))
-        return "<%s>" % "\n".join(rep)
-
-#---------------------------------------------------
-# Form-filling methods.
-
-    def __getitem__(self, name):
-        return self.find_control(name).value
-    def __contains__(self, name):
-        return bool(self.find_control(name))
-    def __setitem__(self, name, value):
-        control = self.find_control(name)
-        try:
-            control.value = value
-        except AttributeError, e:
-            raise ValueError(str(e))
-
-    def get_value(self,
-                  name=None, type=None, kind=None, id=None, nr=None,
-                  by_label=False,  # by_label is deprecated
-                  label=None):
-        """Return value of control.
-
-        If only name and value arguments are supplied, equivalent to
-
-        form[name]
-
-        """
-        if by_label:
-            deprecation("form.get_value_by_label(...)")
-        c = self.find_control(name, type, kind, id, label=label, nr=nr)
-        if by_label:
-            try:
-                meth = c.get_value_by_label
-            except AttributeError:
-                raise NotImplementedError(
-                    "control '%s' does not yet support by_label" % c.name)
-            else:
-                return meth()
-        else:
-            return c.value
-    def set_value(self, value,
-                  name=None, type=None, kind=None, id=None, nr=None,
-                  by_label=False,  # by_label is deprecated
-                  label=None):
-        """Set value of control.
-
-        If only name and value arguments are supplied, equivalent to
-
-        form[name] = value
-
-        """
-        if by_label:
-            deprecation("form.get_value_by_label(...)")
-        c = self.find_control(name, type, kind, id, label=label, nr=nr)
-        if by_label:
-            try:
-                meth = c.set_value_by_label
-            except AttributeError:
-                raise NotImplementedError(
-                    "control '%s' does not yet support by_label" % c.name)
-            else:
-                meth(value)
-        else:
-            c.value = value
-    def get_value_by_label(
-        self, name=None, type=None, kind=None, id=None, label=None, nr=None):
-        """
-
-        All arguments should be passed by name.
-
-        """
-        c = self.find_control(name, type, kind, id, label=label, nr=nr)
-        return c.get_value_by_label()
-
-    def set_value_by_label(
-        self, value,
-        name=None, type=None, kind=None, id=None, label=None, nr=None):
-        """
-
-        All arguments should be passed by name.
-
-        """
-        c = self.find_control(name, type, kind, id, label=label, nr=nr)
-        c.set_value_by_label(value)
-
-    def set_all_readonly(self, readonly):
-        for control in self.controls:
-            control.readonly = bool(readonly)
-
-    def clear_all(self):
-        """Clear the value attributes of all controls in the form.
-
-        See HTMLForm.clear.__doc__.
-
-        """
-        for control in self.controls:
-            control.clear()
-
-    def clear(self,
-              name=None, type=None, kind=None, id=None, nr=None, label=None):
-        """Clear the value attribute of a control.
-
-        As a result, the affected control will not be successful until a value
-        is subsequently set.  AttributeError is raised on readonly controls.
-
-        """
-        c = self.find_control(name, type, kind, id, label=label, nr=nr)
-        c.clear()
-
-
-#---------------------------------------------------
-# Form-filling methods applying only to ListControls.
-
-    def possible_items(self,  # deprecated
-                       name=None, type=None, kind=None, id=None,
-                       nr=None, by_label=False, label=None):
-        """Return a list of all values that the specified control can take."""
-        c = self._find_list_control(name, type, kind, id, label, nr)
-        return c.possible_items(by_label)
-
-    def set(self, selected, item_name,  # deprecated
-            name=None, type=None, kind=None, id=None, nr=None,
-            by_label=False, label=None):
-        """Select / deselect named list item.
-
-        selected: boolean selected state
-
-        """
-        self._find_list_control(name, type, kind, id, label, nr).set(
-            selected, item_name, by_label)
-    def toggle(self, item_name,  # deprecated
-               name=None, type=None, kind=None, id=None, nr=None,
-               by_label=False, label=None):
-        """Toggle selected state of named list item."""
-        self._find_list_control(name, type, kind, id, label, nr).toggle(
-            item_name, by_label)
-
-    def set_single(self, selected,  # deprecated
-                   name=None, type=None, kind=None, id=None,
-                   nr=None, by_label=None, label=None):
-        """Select / deselect list item in a control having only one item.
-
-        If the control has multiple list items, ItemCountError is raised.
-
-        This is just a convenience method, so you don't need to know the item's
-        name -- the item name in these single-item controls is usually
-        something meaningless like "1" or "on".
-
-        For example, if a checkbox has a single item named "on", the following
-        two calls are equivalent:
-
-        control.toggle("on")
-        control.toggle_single()
-
-        """  # by_label ignored and deprecated
-        self._find_list_control(
-            name, type, kind, id, label, nr).set_single(selected)
-    def toggle_single(self, name=None, type=None, kind=None, id=None,
-                      nr=None, by_label=None, label=None):  # deprecated
-        """Toggle selected state of list item in control having only one item.
-
-        The rest is as for HTMLForm.set_single.__doc__.
-
-        """  # by_label ignored and deprecated
-        self._find_list_control(name, type, kind, id, label, nr).toggle_single()
-
-#---------------------------------------------------
-# Form-filling method applying only to FileControls.
-
-    def add_file(self, file_object, content_type=None, filename=None,
-                 name=None, id=None, nr=None, label=None):
-        """Add a file to be uploaded.
-
-        file_object: file-like object (with read method) from which to read
-         data to upload
-        content_type: MIME content type of data to upload
-        filename: filename to pass to server
-
-        If filename is None, no filename is sent to the server.
-
-        If content_type is None, the content type is guessed based on the
-        filename and the data from read from the file object.
-
-        XXX
-        At the moment, guessed content type is always application/octet-stream.
-        Use sndhdr, imghdr modules.  Should also try to guess HTML, XML, and
-        plain text.
-
-        Note the following useful HTML attributes of file upload controls (see
-        HTML 4.01 spec, section 17):
-
-        accept: comma-separated list of content types that the server will
-         handle correctly; you can use this to filter out non-conforming files
-        size: XXX IIRC, this is indicative of whether form wants multiple or
-         single files
-        maxlength: XXX hint of max content length in bytes?
-
-        """
-        self.find_control(name, "file", id=id, label=label, nr=nr).add_file(
-            file_object, content_type, filename)
-
-#---------------------------------------------------
-# Form submission methods, applying only to clickable controls.
-
-    def click(self, name=None, type=None, id=None, nr=0, coord=(1,1),
-              request_class=urllib2.Request,
-              label=None):
-        """Return request that would result from clicking on a control.
-
-        The request object is a urllib2.Request instance, which you can pass to
-        urllib2.urlopen (or ClientCookie.urlopen).
-
-        Only some control types (INPUT/SUBMIT & BUTTON/SUBMIT buttons and
-        IMAGEs) can be clicked.
-
-        Will click on the first clickable control, subject to the name, type
-        and nr arguments (as for find_control).  If no name, type, id or number
-        is specified and there are no clickable controls, a request will be
-        returned for the form in its current, un-clicked, state.
-
-        IndexError is raised if any of name, type, id or nr is specified but no
-        matching control is found.  ValueError is raised if the HTMLForm has an
-        enctype attribute that is not recognised.
-
-        You can optionally specify a coordinate to click at, which only makes a
-        difference if you clicked on an image.
-
-        """
-        return self._click(name, type, id, label, nr, coord, "request",
-                           self._request_class)
-
-    def click_request_data(self,
-                           name=None, type=None, id=None,
-                           nr=0, coord=(1,1),
-                           request_class=urllib2.Request,
-                           label=None):
-        """As for click method, but return a tuple (url, data, headers).
-
-        You can use this data to send a request to the server.  This is useful
-        if you're using httplib or urllib rather than urllib2.  Otherwise, use
-        the click method.
-
-        # Untested.  Have to subclass to add headers, I think -- so use urllib2
-        # instead!
-        import urllib
-        url, data, hdrs = form.click_request_data()
-        r = urllib.urlopen(url, data)
-
-        # Untested.  I don't know of any reason to use httplib -- you can get
-        # just as much control with urllib2.
-        import httplib, urlparse
-        url, data, hdrs = form.click_request_data()
-        tup = urlparse(url)
-        host, path = tup[1], urlparse.urlunparse((None, None)+tup[2:])
-        conn = httplib.HTTPConnection(host)
-        if data:
-            httplib.request("POST", path, data, hdrs)
-        else:
-            httplib.request("GET", path, headers=hdrs)
-        r = conn.getresponse()
-
-        """
-        return self._click(name, type, id, label, nr, coord, "request_data",
-                           self._request_class)
-
-    def click_pairs(self, name=None, type=None, id=None,
-                    nr=0, coord=(1,1),
-                    label=None):
-        """As for click_request_data, but returns a list of (key, value) pairs.
-
-        You can use this list as an argument to ClientForm.urlencode.  This is
-        usually only useful if you're using httplib or urllib rather than
-        urllib2 or ClientCookie.  It may also be useful if you want to manually
-        tweak the keys and/or values, but this should not be necessary.
-        Otherwise, use the click method.
-
-        Note that this method is only useful for forms of MIME type
-        x-www-form-urlencoded.  In particular, it does not return the
-        information required for file upload.  If you need file upload and are
-        not using urllib2, use click_request_data.
-
-        Also note that Python 2.0's urllib.urlencode is slightly broken: it
-        only accepts a mapping, not a sequence of pairs, as an argument.  This
-        messes up any ordering in the argument.  Use ClientForm.urlencode
-        instead.
-
-        """
-        return self._click(name, type, id, label, nr, coord, "pairs",
-                           self._request_class)
-
-#---------------------------------------------------
-
-    def find_control(self,
-                     name=None, type=None, kind=None, id=None,
-                     predicate=None, nr=None,
-                     label=None):
-        """Locate and return some specific control within the form.
-
-        At least one of the name, type, kind, predicate and nr arguments must
-        be supplied.  If no matching control is found, ControlNotFoundError is
-        raised.
-
-        If name is specified, then the control must have the indicated name.
-
-        If type is specified then the control must have the specified type (in
-        addition to the types possible for <input> HTML tags: "text",
-        "password", "hidden", "submit", "image", "button", "radio", "checkbox",
-        "file" we also have "reset", "buttonbutton", "submitbutton",
-        "resetbutton", "textarea", "select" and "isindex").
-
-        If kind is specified, then the control must fall into the specified
-        group, each of which satisfies a particular interface.  The types are
-        "text", "list", "multilist", "singlelist", "clickable" and "file".
-
-        If id is specified, then the control must have the indicated id.
-
-        If predicate is specified, then the control must match that function.
-        The predicate function is passed the control as its single argument,
-        and should return a boolean value indicating whether the control
-        matched.
-
-        nr, if supplied, is the sequence number of the control (where 0 is the
-        first).  Note that control 0 is the first control matching all the
-        other arguments (if supplied); it is not necessarily the first control
-        in the form.  If no nr is supplied, AmbiguityError is raised if
-        multiple controls match the other arguments (unless the
-        .backwards-compat attribute is true).
-
-        If label is specified, then the control must have this label.  Note
-        that radio controls and checkboxes never have labels: their items do.
-
-        """
-        if ((name is None) and (type is None) and (kind is None) and
-            (id is None) and (label is None) and (predicate is None) and
-            (nr is None)):
-            raise ValueError(
-                "at least one argument must be supplied to specify control")
-        return self._find_control(name, type, kind, id, label, predicate, nr)
-
-#---------------------------------------------------
-# Private methods.
-
-    def _find_list_control(self,
-                           name=None, type=None, kind=None, id=None, 
-                           label=None, nr=None):
-        if ((name is None) and (type is None) and (kind is None) and
-            (id is None) and (label is None) and (nr is None)):
-            raise ValueError(
-                "at least one argument must be supplied to specify control")
-
-        return self._find_control(name, type, kind, id, label, 
-                                  is_listcontrol, nr)
-
-    def _find_control(self, name, type, kind, id, label, predicate, nr):
-        if (name is not None) and not isstringlike(name):
-            raise TypeError("control name must be string-like")
-        if (type is not None) and not isstringlike(type):
-            raise TypeError("control type must be string-like")
-        if (kind is not None) and not isstringlike(kind):
-            raise TypeError("control kind must be string-like")
-        if (id is not None) and not isstringlike(id):
-            raise TypeError("control id must be string-like")
-        if (label is not None) and not isstringlike(label):
-            raise TypeError("control label must be string-like")
-        if (predicate is not None) and not callable(predicate):
-            raise TypeError("control predicate must be callable")
-        if (nr is not None) and nr < 0:
-            raise ValueError("control number must be a positive integer")
-
-        orig_nr = nr
-        found = None
-        ambiguous = False
-        if nr is None and self.backwards_compat:
-            nr = 0
-
-        for control in self.controls:
-            if name is not None and name != control.name:
-                continue
-            if type is not None and type != control.type:
-                continue
-            if kind is not None and not control.is_of_kind(kind):
-                continue
-            if id is not None and id != control.id:
-                continue
-            if predicate and not predicate(control):
-                continue
-            if label:
-                for l in control.get_labels():
-                    if l.text.find(label) > -1:
-                        break
-                else:
-                    continue
-            if nr is not None:
-                if nr == 0:
-                    return control  # early exit: unambiguous due to nr
-                nr -= 1
-                continue
-            if found:
-                ambiguous = True
-                break
-            found = control
-
-        if found and not ambiguous:
-            return found
-
-        description = []
-        if name is not None: description.append("name '%s'" % name)
-        if type is not None: description.append("type '%s'" % type)
-        if kind is not None: description.append("kind '%s'" % kind)
-        if id is not None: description.append("id '%s'" % id)
-        if label is not None: description.append("label '%s'" % label)
-        if predicate is not None:
-            description.append("predicate %s" % predicate)
-        if orig_nr: description.append("nr %d" % orig_nr)
-        description = ", ".join(description)
-
-        if ambiguous:
-            raise AmbiguityError("more than one control matching "+description)
-        elif not found:
-            raise ControlNotFoundError("no control matching "+description)
-        assert False
-
-    def _click(self, name, type, id, label, nr, coord, return_type,
-               request_class=urllib2.Request):
-        try:
-            control = self._find_control(
-                name, type, "clickable", id, label, None, nr)
-        except ControlNotFoundError:
-            if ((name is not None) or (type is not None) or (id is not None) or
-                (nr != 0)):
-                raise
-            # no clickable controls, but no control was explicitly requested,
-            # so return state without clicking any control
-            return self._switch_click(return_type, request_class)
-        else:
-            return control._click(self, coord, return_type, request_class)
-
-    def _pairs(self):
-        """Return sequence of (key, value) pairs suitable for urlencoding."""
-        return [(k, v) for (i, k, v, c_i) in self._pairs_and_controls()]
-
-
-    def _pairs_and_controls(self):
-        """Return sequence of (index, key, value, control_index)
-        of totally ordered pairs suitable for urlencoding.
-
-        control_index is the index of the control in self.controls
-        """
-        pairs = []
-        for control_index in range(len(self.controls)):
-            control = self.controls[control_index]
-            for ii, key, val in control._totally_ordered_pairs():
-                pairs.append((ii, key, val, control_index))
-
-        # stable sort by ONLY first item in tuple
-        pairs.sort()
-
-        return pairs
-
-    def _request_data(self):
-        """Return a tuple (url, data, headers)."""
-        method = self.method.upper()
-        #scheme, netloc, path, parameters, query, frag = urlparse.urlparse(self.action)
-        parts = urlparse.urlparse(self.action)
-        rest, (query, frag) = parts[:-2], parts[-2:]
-
-        if method == "GET":
-            if self.enctype != "application/x-www-form-urlencoded":
-                raise ValueError(
-                    "unknown GET form encoding type '%s'" % self.enctype)
-            parts = rest + (urlencode(self._pairs()), "")
-            uri = urlparse.urlunparse(parts)
-            return uri, None, []
-        elif method == "POST":
-            parts = rest + (query, "")
-            uri = urlparse.urlunparse(parts)
-            if self.enctype == "application/x-www-form-urlencoded":
-                return (uri, urlencode(self._pairs()),
-                        [("Content-type", self.enctype)])
-            elif self.enctype == "multipart/form-data":
-                data = StringIO()
-                http_hdrs = []
-                mw = MimeWriter(data, http_hdrs)
-                f = mw.startmultipartbody("form-data", add_to_http_hdrs=True,
-                                          prefix=0)
-                for ii, k, v, control_index in self._pairs_and_controls():
-                    self.controls[control_index]._write_mime_data(mw, k, v)
-                mw.lastpart()
-                return uri, data.getvalue(), http_hdrs
-            else:
-                raise ValueError(
-                    "unknown POST form encoding type '%s'" % self.enctype)
-        else:
-            raise ValueError("Unknown method '%s'" % method)
-
-    def _switch_click(self, return_type, request_class=urllib2.Request):
-        # This is called by HTMLForm and clickable Controls to hide switching
-        # on return_type.
-        if return_type == "pairs":
-            return self._pairs()
-        elif return_type == "request_data":
-            return self._request_data()
-        else:
-            req_data = self._request_data()
-            req = request_class(req_data[0], req_data[1])
-            for key, val in req_data[2]:
-                add_hdr = req.add_header
-                if key.lower() == "content-type":
-                    try:
-                        add_hdr = req.add_unredirected_header
-                    except AttributeError:
-                        # pre-2.4 and not using ClientCookie
-                        pass
-                add_hdr(key, val)
-            return req



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