def process_css(html, stylesheets):
p = Processor()
parser = etree.HTMLParser()
tree = etree.fromstring(html, parser).getroottree()
page = tree.getroot()
if page is None:
print repr(html)
raise ParserError("Could not parse the HTML")
body, = CSSSelector('body')(page)
processed_css = ''
for sheet in stylesheets:
sheet_path = normpath(join(PROJECT_ROOT, sheet))
with open(sheet_path, 'r') as sheet_file:
content = unicode(sheet_file.read(), 'utf-8')
processed_css += p._process_content(content, [body, ])
return cssmin(processed_css)
