[Zope-Checkins] SVN: Zope/branches/2.10/lib/python/ re-added
ClientForm.py since single files can not be referenced
Andreas Jung
andreas at andreas-jung.com
Sat Aug 19 08:57:05 EDT 2006
Log message for revision 69687:
re-added ClientForm.py since single files can not be referenced
through a svn:external
Changed:
_U Zope/branches/2.10/lib/python/
A Zope/branches/2.10/lib/python/ClientForm.py
-=-
Property changes on: Zope/branches/2.10/lib/python
___________________________________________________________________
Name: svn:externals
- ZConfig svn://svn.zope.org/repos/main/ZConfig/tags/ZConfig-2.3.1
BTrees -r 68677 svn://svn.zope.org/repos/main/ZODB/branches/3.7/src/BTrees
persistent -r 68677 svn://svn.zope.org/repos/main/ZODB/branches/3.7/src/persistent
ThreadedAsync -r 68677 svn://svn.zope.org/repos/main/ZODB/branches/3.7/src/ThreadedAsync
transaction -r 68677 svn://svn.zope.org/repos/main/ZODB/branches/3.7/src/transaction
ZEO -r 68677 svn://svn.zope.org/repos/main/ZODB/branches/3.7/src/ZEO
ZODB -r 68677 svn://svn.zope.org/repos/main/ZODB/branches/3.7/src/ZODB
ZopeUndo -r 68677 svn://svn.zope.org/repos/main/ZODB/branches/3.7/src/ZopeUndo
zdaemon -r 40792 svn://svn.zope.org/repos/main/zdaemon/trunk/src/zdaemon
pytz -r 69031 svn://svn.zope.org/repos/main/Zope3/branches/3.3/src/pytz
zodbcode -r 69031 svn://svn.zope.org/repos/main/Zope3/branches/3.3/src/zodbcode
mechanize -r 69031 svn://svn.zope.org/repos/main/Zope3/branches/3.3/src/mechanize
docutils svn://svn.zope.org/repos/main/docutils/tags/0.4.0-zope
+ BTrees svn://svn.zope.org/repos/main/ZODB/tags/3.7.0b2/src/BTrees
ThreadedAsync svn://svn.zope.org/repos/main/ZODB/tags/3.7.0b2/src/ThreadedAsync
ZConfig svn://svn.zope.org/repos/main/ZConfig/tags/ZConfig-2.3.1
ZEO svn://svn.zope.org/repos/main/ZODB/tags/3.7.0b2/src/ZEO
ZODB svn://svn.zope.org/repos/main/ZODB/tags/3.7.0b2/src/ZODB
ZopeUndo svn://svn.zope.org/repos/main/ZODB/tags/3.7.0b2/src/ZopeUndo
docutils svn://svn.zope.org/repos/main/docutils/tags/0.4.0-zope
mechanize svn://svn.zope.org/repos/main/Zope3/tags/3.3.0b2/src/mechanize
persistent svn://svn.zope.org/repos/main/ZODB/tags/3.7.0b2/src/persistent
pytz svn://svn.zope.org/repos/main/Zope3/tags/3.3.0b2/src/pytz
transaction svn://svn.zope.org/repos/main/ZODB/tags/3.7.0b2/src/transaction
zdaemon -r 40792 svn://svn.zope.org/repos/main/zdaemon/trunk/src/zdaemon
zodbcode svn://svn.zope.org/repos/main/Zope3/tags/3.3.0b2/src/zodbcode
Added: Zope/branches/2.10/lib/python/ClientForm.py
===================================================================
--- Zope/branches/2.10/lib/python/ClientForm.py 2006-08-19 12:52:39 UTC (rev 69686)
+++ Zope/branches/2.10/lib/python/ClientForm.py 2006-08-19 12:57:03 UTC (rev 69687)
@@ -0,0 +1,3223 @@
+"""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 {"&": "&", ...} 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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