Package cssutils :: Package scripts :: Module csscapture |
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# Source Code for Module cssutils.scripts.csscapture

      1  #!/usr/bin/env python
      2  """Retrieve all CSS stylesheets including embedded for a given URL.
      3  Retrieve as StyleSheetList or save to disk - raw, parsed or minified version.
      4
      5  TODO:
      6  - maybe use DOM 3 load/save?
      7  - logger class which handles all cases when no log is given...
      8  - saveto: why does urllib2 hang?
      9  """
     10  __all__ = ['CSSCapture']
     11  __docformat__ = 'restructuredtext'
     12  __version__ = '$Id: csscapture.py 1257 2008-05-26 20:17:44Z cthedot $'
     13
     14  import codecs
     15  import errno
     16  import HTMLParser
     17  import logging
     18  import os
     19  import sys
     20  import urllib2
     21  import urlparse
     22
     23  import cssutils
     24  try:
     25      import encutils
     26  except ImportError:
     27      try:
     28          import cssutils.encutils as encutils
     29      except ImportError:
     30          sys.exit("You need encutils from http://cthedot.de/encutils/")
     31
     32 -class CSSCaptureHTMLParser(HTMLParser.HTMLParser):
     33      """ parses given data for link and style elements """
     34      curtag = u''
     35      links = []
     36      # list of attrsdict
     37      styles = []
     38      # list of (attrsdict, data)
     39
     40 -    def _lowerattrs(self, attrs):
     41          return dict([(a.lower(), v.lower()) for a, v in attrs])
     42
     43 -    def handle_starttag(self, tag, attrs):
     44          if tag == u'link':
     45              attrs = self._lowerattrs(attrs)
     46              if attrs.get(u'type', u'') == u'text/css':
     47                  self.links.append(attrs)
     48          # also get content of tag
     49          elif tag == u'style':
     50              attrs = self._lowerattrs(attrs)
     51              if attrs.get(u'type', u'') == u'text/css':
     52                  self.styles.append((attrs, u''))
     53                  self.curtag = tag
     54          else:
     55              # close as style cannot contain any elements
     56              self.curtag = u''
     57
     58 -    def handle_data(self, data):
     59          if self.curtag == u'style':
     60              self.styles[-1] = (self.styles[-1][0], data)
     61
     62 -    def handle_comment(self, data):
     63          # style might have comment content, treat same as data
     64          self.handle_data(data)
     65
     66 -    def handle_endtag(self, tag):
     67          # close as style cannot contain any elements
     68          self.curtag = u''
     69
     70 -class CSSCapture(object):
     71      """
     72      Retrieve all CSS stylesheets including embedded for a given URL.
     73      Optional setting of User-Agent used for retrieval possible
     74      to handle browser sniffing servers.
     75
     76      raises urllib2.HTTPError
     77      """
     78 -    def __init__(self, ua=None, log=None, defaultloglevel=logging.INFO):
     79          """
     80          initialize a new Capture object
     81
     82          ua
     83              init User-Agent to use for requests
     84          log
     85              supply a log object which is used instead of the default
     86              log which writes to sys.stderr
     87          defaultloglevel
     88              constant of logging package which defines the level of the
     89              default log if no explicit log given
     90          """
     91          self._ua = ua
     92          self._parser = CSSCaptureHTMLParser()
     93
     94          if log:
     95              self._log = log
     96          else:
     97              self._log = logging.getLogger('CSSCapture')
     98              hdlr = logging.StreamHandler(sys.stderr)
     99              formatter = logging.Formatter('%(message)s')
    100              hdlr.setFormatter(formatter)
    101              self._log.addHandler(hdlr)
    102              self._log.setLevel(defaultloglevel)
    103              self._log.debug(u'Using default log')
    104
    105 -    def _doRequest(self, url):
    106          """
    107          Does an HTTP request
    108
    109          Returns: (response, url)
    110
    111          url might have been changed by server due to redirects etc
    112          """
    113          self._log.debug(u'    CSSCapture._doRequest\n        * URL: %s' % url)
    114
    115          req = urllib2.Request(url)
    116          if self._ua:
    117              req.add_header('User-agent', self._ua)
    118              self._log.info('        * Using User-Agent: %s', self._ua)
    119          try:
    120              res = urllib2.urlopen(req)
    121          except urllib2.HTTPError, e:
    122              self._log.critical('    %s\n%s %s\n%s' % (
    123                  e.geturl(), e.code, e.msg, e.headers))
    124              return None, None
    125
    126          # get real url
    127          if url != res.geturl():
    128              url = res.geturl()
    129              self._log.info('        URL retrieved: %s', url)
    130
    131          return res, url
    132
    133 -    def _createStyleSheet(self, href=None,
    134                            media=None,
    135                            parentStyleSheet=None,
    136                            title=u'',
    137                            cssText=None,
    138                            encoding=None):
    139          """
    140          returns CSSStyleSheet read from href or if cssText is given use that
    141
    142          encoding
    143              used if inline style found, same as self.docencoding
    144          """
    145          if not cssText:
    146              res, href = self._doRequest(href)
    147              if res:
    148                  if not encoding:
    149                      media_type, encoding = encutils.getHTTPInfo(res)
    150                      if media_type != u'text/css':
    151                          self._log.warn(u'    WARNING: HTTP media type is different than expected "text/css": %r' %
    152                                         media_type)
    153                  try:
    154                      cssText = codecs.getreader('css')(res,
    155                                                        encoding=encoding).read()
    156                  except UnicodeDecodeError, e:
    157                      self._log.error(u'    Error retrieving CSS, probably encoding mismatch:\n\t%s\n\t%s'
    158                                       % (href, e))
    159                      return None
    160              else:
    161                  self._log.error(u'    ERROR accessing CSS\n\t' % href)
    162                  return None
    163
    164          sheet = cssutils.parseString(cssText)
    165          sheet._href = href
    166          sheet.media = media
    167          sheet._parentStyleSheet = parentStyleSheet
    168          sheet.title = title
    169          if href:
    170              self._log.info(u'    * href : %s', href)
    171          self._log.debug(u'    * title: %s', title)
    172          self._log.info(u'    * media: %s', media.mediaText)
    173          self._log.info(u'    %s\n' % sheet)
    174          self._log.debug(u'    * cssText:\n%s\n', cssText)
    175
    176          self._nonparsed[sheet] = cssText
    177          return sheet
    178
    179 -    def _doImports(self, parentStyleSheet, baseurl=None):
    180          """
    181          handle all @import CSS stylesheet recursively
    182          found CSS stylesheets are appended to stylesheetlist
    183          """
    184          for rule in parentStyleSheet.cssRules:
    185              if rule.type == rule.IMPORT_RULE:
    186                  self._log.info(u'\n@import FOUND -----')
    187                  self._log.debug(u'    IN: %s\n' % parentStyleSheet)
    188                  href = urlparse.urljoin(baseurl, rule.href)
    189                  sheet = self._createStyleSheet(
    190                      href=href,
    191                      media=rule.media,
    192                      parentStyleSheet=parentStyleSheet)
    193                  if sheet:
    194                      self.stylesheetlist.append(sheet)
    195                      self._doImports(sheet, baseurl=href)
    196
    197 -    def _findStyleSheets(self, docurl, doctext):
    198          """
    199          parse text for stylesheets
    200          fills stylesheetlist with all found StyleSheets
    201
    202          docurl
    203              to build a full url of found StyleSheets @href
    204          doctext
    205              to parse
    206          """
    207          self._parser.feed(doctext)
    208          # <link>ed stylesheets, ownerNode should be set to the <link> node
    209          for link in self._parser.links:
    210              self._log.info(u'\n<link> FOUND -----')
    211              self._log.debug(u'    %s\n' % link)
    212              href = urlparse.urljoin(docurl, link.get(u'href', u''))
    213              sheet = self._createStyleSheet(
    214                  href=href,
    215                  media=cssutils.stylesheets.MediaList(
    216                                              link.get(u'media', u'')),
    217                  title=link.get(u'title', u''))
    218              if sheet:
    219                  self.stylesheetlist.append(sheet)
    220                  self._doImports(sheet, baseurl=href)
    221
    222          # internal <style> sheets
    223          #  href is None for internal stylesheets
    224          #  ownerNode should be set to the <style> node
    225          for style in self._parser.styles:
    226              stylemeta, cssText = style
    227              self._log.info(u'\n<style> FOUND -----' )
    228              self._log.debug(u'    %s\n' % stylemeta)
    229              sheet = self._createStyleSheet(
    230                  media=cssutils.stylesheets.MediaList(
    231                                              stylemeta.get(u'media', u'')),
    232                  title=stylemeta.get(u'title', u''),
    233                  cssText=cssText,
    234                  encoding=self.docencoding)
    235              if sheet:
    236                  self.stylesheetlist.append(sheet)
    237                  self._doImports(sheet, baseurl=docurl)
    238
    239 -    def capture(self, url, ua=None):
    240          """
    241          Capture stylesheets for the given url, any HTTPError is raised to
    242          caller.
    243
    244          url
    245              to capture CSS from
    246          ua
    247              User-Agent to use for requests
    248
    249          Returns StyleSheetList.
    250          """
    251          if ua is not None:
    252              self._ua = ua
    253
    254          self._log.info(u'\nCapturing CSS from URL: %s\n', url)
    255          self.stylesheetlist = cssutils.stylesheets.StyleSheetList()
    256
    257          # used to save inline styles
    258          scheme, loc, path, query, fragment = urlparse.urlsplit(url)
    259          self._filename = os.path.basename(path)
    260
    261          # get url content
    262          res, url = self._doRequest(url)
    263          if not res:
    264              sys.exit(1)
    265          rawdoc = res.read()
    266
    267          self.docencoding = encutils.getEncodingInfo(
    268              res, rawdoc, log=self._log).encoding
    269          self._log.info(u'\nUsing Encoding: %s\n', self.docencoding)
    270
    271          doctext = unicode(rawdoc, self.docencoding)
    272
    273          # fill list of stylesheets and list of raw css
    274          self._nonparsed = {}
    275          self._findStyleSheets(url, doctext)
    276
    277          return self.stylesheetlist
    278
    279 -    def saveto(self, dir, saveraw=False, minified=False):
    280          """
    281          saves css in "dir" in the same layout as on the server
    282          internal stylesheets are saved as "dir/__INLINE_STYLE__.html.css"
    283
    284          dir
    285              directory to save files to
    286          saveparsed
    287              save literal CSS from server or save the parsed CSS
    288          minified
    289              save minified CSS
    290
    291          Both parsed and minified (which is also parsed of course) will
    292          loose information which cssutils is unable to understand or where
    293          it is simple buggy. You might to first save the raw version before
    294          parsing of even minifying it.
    295          """
    296          msg = 'parsed'
    297          if saveraw:
    298              msg = 'raw'
    299          if minified:
    300              cssutils.ser.prefs.useMinified()
    301              msg = 'minified'
    302
    303          inlines = 0
    304          for sheet in self.stylesheetlist:
    305              url = sheet.href
    306              if not url:
    307                  inlines += 1
    308                  url = '%s_INLINE_%s.css' % (
    309                      self._filename, inlines)
    310
    311              # build savepath
    312              scheme, loc, path, query, fragment = urlparse.urlsplit(url)
    313              # no absolute path
    314              if path and path.startswith('/'):
    315                  path = path[1:]
    316              path = os.path.normpath(path)
    317              path, fn = os.path.split(path)
    318              savepath = os.path.join(dir, loc, path)
    319              savefn = os.path.join(savepath, fn)
    320              try:
    321                  os.makedirs(savepath)
    322              except OSError, e:
    323                  if e.errno != errno.EEXIST:
    324                      raise e
    325                  self._log.debug(u'Path "%s" already exists.', savepath)
    326
    327              if saveraw:
    328                  cssText = self._nonparsed[sheet]
    329              else:
    330                  cssText = sheet.cssText
    331
    332              self._log.info(u'Saving %s "%s"' % (msg, savefn))
    333              sf = open(savefn, 'wb')
    334              uf = codecs.getwriter('css')(sf)
    335              uf.write(cssText)
    336              sf.close()
    337
    338 -def main(args=None):
    339      import optparse
    340
    341      usage = "usage: %prog [options] URL"
    342      parser = optparse.OptionParser(usage=usage)
    343      parser.add_option('-d', '--debug', action='store_true', dest='debug',
    344          help='show debug messages during capturing')
    345      parser.add_option('-m', '--minified', action='store_true', dest='minified',
    346          help='saves minified version of captured files')
    347      parser.add_option('-n', '--notsave', action='store_true', dest='notsave',
    348          help='if given files are NOT saved, only log is written')
    349      parser.add_option('-r', '--saveraw', action='store_true', dest='saveraw',
    350          help='if given saves raw css otherwise cssutils\' parsed files')
    351      parser.add_option('-s', '--saveto', action='store', dest='saveto',
    352          help='saving retrieved files to "saveto", defaults to "_CSSCapture_SAVED"')
    353      parser.add_option('-u', '--useragent', action='store', dest='ua',
    354          help='useragent to use for request of URL, default is urllib2s default')
    355      options, url = parser.parse_args()
    356
    357      if not url:
    358          parser.error('no URL given')
    359      else:
    360          url = url[0]
    361
    362      if options.debug:
    363          dll = logging.DEBUG
    364      else:
    365          dll = logging.INFO
    366
    367      # START
    368      c = CSSCapture(defaultloglevel=dll)
    369
    370      stylesheetlist = c.capture(url, ua=options.ua)
    371
    372      if options.notsave is None or not options.notsave:
    373          if options.saveto:
    374              saveto = options.saveto
    375          else:
    376              saveto = '_CSSCapture_SAVED'
    377          c.saveto(saveto, saveraw=options.saveraw, minified=options.minified)
    378      else:
    379          for i, s in enumerate(stylesheetlist):
    380              print i+1, u'\thref : "%s"\n\ttitle: "%s", \n' % (s.href, s.title)
    381
    382
    383  if __name__ == "__main__":
    384      sys.exit(main())
    385