Is Python powerful enough for this?

Fri Aug 31 06:38:39 EDT 2001

On Fri, 31 Aug 2001, A wrote:

> On 30 Aug 2001, at 17:36, Roman Suzi wrote:
> 
> > On Thu, 30 Aug 2001, A wrote:
> > 
> > > Hi,
> > > I have some webpages that contain FORMS. Each form has input 
> > > fields and also some hidden fields. 
> > > How can I easily get urlencoded string from all these fields
> > > like
> > > Key1=Value1&Key2=Value2&Key3=Value3
> > > 
> > > For example:
> > > I have a following web page
> > > <html>
> > > 
> > > <head>
> > > </head>
> > > <body>
> > > <form method="POST" action="c.cgi">
> > >   <p><input type="text" name="T1" size="20"></p>
> > >   <p><input type="checkbox" name="C1" value="ON"></p>
> > >   <p><textarea rows="2" name="S1" cols="20"></textarea></p>
> > >   <p><input type="submit" value="Submit" name="B1"><input 
> > > type="reset" value="Reset" name="B2"></p>
> > > </form>
> > > </body>
> > > </html>
> > > 
> > > >From the above 
> > > I would like to receive 
> > > T1=&S1=&C1=&B1=Submit
> > 
> > I do not follow what are you trying to do?
> > 
> > Do you need to convert HTML input into corresponding urlencoded
> > output as if the form were filled empty?
> Yes.
> > 
> > For this you can make your htmllib.HTMLParser and make handlers for
> > form-specific tags. (In fact, sgmllib.SGMLParser is even easier to use for
> > this task).
> Can you please give an example? I am a newbie with Python

import sgmllib, urllib
example = """ <form><input name="aaa" value="bbb"     </form>"""
class FormParser(sgmllib.SGMLParser):
  def __init__(self):
    sgmllib.SGMLParser.__init__(self)
    self._record = 0
    self._form = {}
  def __str__(self):
    return urllib.urlencode(self._form)
  def start_form(self, atts):
    attdict = self._attdict(atts)
    self._record = 1
  def end_form(self):
    self._record = 0
  def _attdict(self, atts):
    attdict = {}
    for attname, attval in atts:
      attdict[attname] = attval
    return attdict

  def start_input(self, atts):
    if self._record:
      attdict = self._attdict(atts)
      if attdict.has_key("name"):
        name = attdict["name"]
        if attdict.has_key("value"):
          self._form[name] = attdict["value"]
        else:
          self._form[name] = ""
  start_select = start_textarea = start_input
f = FormParser()
f.feed(example)
print str(f)

> > And what if there are several forms on the page?
> There should be only one.
> 
> >  
>  Thank you for help.
>  Ladislav

Sincerely yours, Roman A.Suzi
-- 
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