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|
"""HTML 2.0 parser.
See the HTML 2.0 specification:
http://www.w3.org/hypertext/WWW/MarkUp/html-spec/html-spec_toc.html
"""
from sgmllib import SGMLParser
from formatter import AS_IS
__all__ = ["HTMLParser"]
class HTMLParser(SGMLParser):
from htmlentitydefs import entitydefs
def __init__(self, formatter, verbose=0):
SGMLParser.__init__(self, verbose)
self.formatter = formatter
self.savedata = None
self.isindex = 0
self.title = None
self.base = None
self.anchor = None
self.anchorlist = []
self.nofill = 0
self.list_stack = []
# ------ Methods used internally; some may be overridden
# --- Formatter interface, taking care of 'savedata' mode;
# shouldn't need to be overridden
def handle_data(self, data):
if self.savedata is not None:
self.savedata = self.savedata + data
else:
if self.nofill:
self.formatter.add_literal_data(data)
else:
self.formatter.add_flowing_data(data)
# --- Hooks to save data; shouldn't need to be overridden
def save_bgn(self):
self.savedata = ''
def save_end(self):
data = self.savedata
self.savedata = None
if not self.nofill:
data = ' '.join(data.split())
return data
# --- Hooks for anchors; should probably be overridden
def anchor_bgn(self, href, name, type):
self.anchor = href
if self.anchor:
self.anchorlist.append(href)
def anchor_end(self):
if self.anchor:
self.handle_data("[%d]" % len(self.anchorlist))
self.anchor = None
# --- Hook for images; should probably be overridden
def handle_image(self, src, alt, *args):
self.handle_data(alt)
# --------- Top level elememts
def start_html(self, attrs): pass
def end_html(self): pass
def start_head(self, attrs): pass
def end_head(self): pass
def start_body(self, attrs): pass
def end_body(self): pass
# ------ Head elements
def start_title(self, attrs):
self.save_bgn()
def end_title(self):
self.title = self.save_end()
def do_base(self, attrs):
for a, v in attrs:
if a == 'href':
self.base = v
def do_isindex(self, attrs):
self.isindex = 1
def do_link(self, attrs):
pass
def do_meta(self, attrs):
pass
def do_nextid(self, attrs): # Deprecated
pass
# ------ Body elements
# --- Headings
def start_h1(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_font(('h1', 0, 1, 0))
def end_h1(self):
self.formatter.end_paragraph(1)
self.formatter.pop_font()
def start_h2(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_font(('h2', 0, 1, 0))
def end_h2(self):
self.formatter.end_paragraph(1)
self.formatter.pop_font()
def start_h3(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_font(('h3', 0, 1, 0))
def end_h3(self):
self.formatter.end_paragraph(1)
self.formatter.pop_font()
def start_h4(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_font(('h4', 0, 1, 0))
def end_h4(self):
self.formatter.end_paragraph(1)
self.formatter.pop_font()
def start_h5(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_font(('h5', 0, 1, 0))
def end_h5(self):
self.formatter.end_paragraph(1)
self.formatter.pop_font()
def start_h6(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_font(('h6', 0, 1, 0))
def end_h6(self):
self.formatter.end_paragraph(1)
self.formatter.pop_font()
# --- Block Structuring Elements
def do_p(self, attrs):
self.formatter.end_paragraph(1)
def start_pre(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_font((AS_IS, AS_IS, AS_IS, 1))
self.nofill = self.nofill + 1
def end_pre(self):
self.formatter.end_paragraph(1)
self.formatter.pop_font()
self.nofill = max(0, self.nofill - 1)
def start_xmp(self, attrs):
self.start_pre(attrs)
self.setliteral('xmp') # Tell SGML parser
def end_xmp(self):
self.end_pre()
def start_listing(self, attrs):
self.start_pre(attrs)
self.setliteral('listing') # Tell SGML parser
def end_listing(self):
self.end_pre()
def start_address(self, attrs):
self.formatter.end_paragraph(0)
self.formatter.push_font((AS_IS, 1, AS_IS, AS_IS))
def end_address(self):
self.formatter.end_paragraph(0)
self.formatter.pop_font()
def start_blockquote(self, attrs):
self.formatter.end_paragraph(1)
self.formatter.push_margin('blockquote')
def end_blockquote(self):
self.formatter.end_paragraph(1)
self.formatter.pop_margin()
# --- List Elements
def start_ul(self, attrs):
self.formatter.end_paragraph(not self.list_stack)
self.formatter.push_margin('ul')
self.list_stack.append(['ul', '*', 0])
def end_ul(self):
if self.list_stack: del self.list_stack[-1]
self.formatter.end_paragraph(not self.list_stack)
self.formatter.pop_margin()
def do_li(self, attrs):
self.formatter.end_paragraph(0)
if self.list_stack:
[dummy, label, counter] = top = self.list_stack[-1]
top[2] = counter = counter+1
else:
label, counter = '*', 0
self.formatter.add_label_data(label, counter)
def start_ol(self, attrs):
self.formatter.end_paragraph(not self.list_stack)
self.formatter.push_margin('ol')
label = '1.'
for a, v in attrs:
if a == 'type':
if len(v) == 1: v = v + '.'
label = v
self.list_stack.append(['ol', label, 0])
def end_ol(self):
if self.list_stack: del self.list_stack[-1]
self.formatter.end_paragraph(not self.list_stack)
self.formatter.pop_margin()
def start_menu(self, attrs):
self.start_ul(attrs)
def end_menu(self):
self.end_ul()
def start_dir(self, attrs):
self.start_ul(attrs)
def end_dir(self):
self.end_ul()
def start_dl(self, attrs):
self.formatter.end_paragraph(1)
self.list_stack.append(['dl', '', 0])
def end_dl(self):
self.ddpop(1)
if self.list_stack: del self.list_stack[-1]
def do_dt(self, attrs):
self.ddpop()
def do_dd(self, attrs):
self.ddpop()
self.formatter.push_margin('dd')
self.list_stack.append(['dd', '', 0])
def ddpop(self, bl=0):
self.formatter.end_paragraph(bl)
if self.list_stack:
if self.list_stack[-1][0] == 'dd':
del self.list_stack[-1]
self.formatter.pop_margin()
# --- Phrase Markup
# Idiomatic Elements
def start_cite(self, attrs): self.start_i(attrs)
def end_cite(self): self.end_i()
def start_code(self, attrs): self.start_tt(attrs)
def end_code(self): self.end_tt()
def start_em(self, attrs): self.start_i(attrs)
def end_em(self): self.end_i()
def start_kbd(self, attrs): self.start_tt(attrs)
def end_kbd(self): self.end_tt()
def start_samp(self, attrs): self.start_tt(attrs)
def end_samp(self): self.end_tt()
def start_strong(self, attrs): self.start_b(attrs)
def end_strong(self): self.end_b()
def start_var(self, attrs): self.start_i(attrs)
def end_var(self): self.end_i()
# Typographic Elements
def start_i(self, attrs):
self.formatter.push_font((AS_IS, 1, AS_IS, AS_IS))
def end_i(self):
self.formatter.pop_font()
def start_b(self, attrs):
self.formatter.push_font((AS_IS, AS_IS, 1, AS_IS))
def end_b(self):
self.formatter.pop_font()
def start_tt(self, attrs):
self.formatter.push_font((AS_IS, AS_IS, AS_IS, 1))
def end_tt(self):
self.formatter.pop_font()
def start_a(self, attrs):
href = ''
name = ''
type = ''
for attrname, value in attrs:
value = value.strip()
if attrname == 'href':
href = value
if attrname == 'name':
name = value
if attrname == 'type':
type = value.lower()
self.anchor_bgn(href, name, type)
def end_a(self):
self.anchor_end()
# --- Line Break
def do_br(self, attrs):
self.formatter.add_line_break()
# --- Horizontal Rule
def do_hr(self, attrs):
self.formatter.add_hor_rule()
# --- Image
def do_img(self, attrs):
align = ''
alt = '(image)'
ismap = ''
src = ''
width = 0
height = 0
for attrname, value in attrs:
if attrname == 'align':
align = value
if attrname == 'alt':
alt = value
if attrname == 'ismap':
ismap = value
if attrname == 'src':
src = value
if attrname == 'width':
try: width = int(value)
except: pass
if attrname == 'height':
try: height = int(value)
except: pass
self.handle_image(src, alt, ismap, align, width, height)
# --- Really Old Unofficial Deprecated Stuff
def do_plaintext(self, attrs):
self.start_pre(attrs)
self.setnomoretags() # Tell SGML parser
# --- Unhandled tags
def unknown_starttag(self, tag, attrs):
pass
def unknown_endtag(self, tag):
pass
def test(args = None):
import sys, formatter
if not args:
args = sys.argv[1:]
silent = args and args[0] == '-s'
if silent:
del args[0]
if args:
file = args[0]
else:
file = 'test.html'
if file == '-':
f = sys.stdin
else:
try:
f = open(file, 'r')
except IOError, msg:
print file, ":", msg
sys.exit(1)
data = f.read()
if f is not sys.stdin:
f.close()
if silent:
f = formatter.NullFormatter()
else:
f = formatter.AbstractFormatter(formatter.DumbWriter())
p = HTMLParser(f)
p.feed(data)
p.close()
if __name__ == '__main__':
test()
|
