mirror of https://github.com/python/cpython.git
634 lines
14 KiB
Python
634 lines
14 KiB
Python
# A parser for HTML documents
|
|
|
|
|
|
# HTML: HyperText Markup Language; an SGML-like syntax used by WWW to
|
|
# describe hypertext documents
|
|
#
|
|
# SGML: Standard Generalized Markup Language
|
|
#
|
|
# WWW: World-Wide Web; a distributed hypertext system develped at CERN
|
|
#
|
|
# CERN: European Particle Physics Laboratory in Geneva, Switzerland
|
|
|
|
|
|
# This file is only concerned with parsing and formatting HTML
|
|
# documents, not with the other (hypertext and networking) aspects of
|
|
# the WWW project. (It does support highlighting of anchors.)
|
|
|
|
|
|
import os
|
|
import sys
|
|
import regex
|
|
import string
|
|
import sgmllib
|
|
|
|
|
|
class HTMLParser(sgmllib.SGMLParser):
|
|
|
|
# Copy base class entities and add some
|
|
entitydefs = {}
|
|
for key in sgmllib.SGMLParser.entitydefs.keys():
|
|
entitydefs[key] = sgmllib.SGMLParser.entitydefs[key]
|
|
entitydefs['bullet'] = '*'
|
|
|
|
# Provided -- handlers for tags introducing literal text
|
|
|
|
def start_listing(self, attrs):
|
|
self.setliteral('listing')
|
|
self.literal_bgn('listing', attrs)
|
|
|
|
def end_listing(self):
|
|
self.literal_end('listing')
|
|
|
|
def start_xmp(self, attrs):
|
|
self.setliteral('xmp')
|
|
self.literal_bgn('xmp', attrs)
|
|
|
|
def end_xmp(self):
|
|
self.literal_end('xmp')
|
|
|
|
def do_plaintext(self, attrs):
|
|
self.setnomoretags()
|
|
self.literal_bgn('plaintext', attrs)
|
|
|
|
# To be overridden -- begin/end literal mode
|
|
def literal_bgn(self, tag, attrs): pass
|
|
def literal_end(self, tag): pass
|
|
|
|
|
|
# Next level of sophistication -- collect anchors, title, nextid and isindex
|
|
class CollectingParser(HTMLParser):
|
|
#
|
|
def __init__(self):
|
|
HTMLParser.__init__(self)
|
|
self.savetext = None
|
|
self.nextid = []
|
|
self.isindex = 0
|
|
self.title = ''
|
|
self.inanchor = 0
|
|
self.anchors = []
|
|
self.anchornames = []
|
|
self.anchortypes = []
|
|
#
|
|
def start_a(self, attrs):
|
|
self.inanchor = 0
|
|
href = ''
|
|
name = ''
|
|
type = ''
|
|
for attrname, value in attrs:
|
|
if attrname == 'href':
|
|
href = value
|
|
if attrname == 'name=':
|
|
name = value
|
|
if attrname == 'type=':
|
|
type = string.lower(value)
|
|
if not (href or name):
|
|
return
|
|
self.anchors.append(href)
|
|
self.anchornames.append(name)
|
|
self.anchortypes.append(type)
|
|
self.inanchor = len(self.anchors)
|
|
if not href:
|
|
self.inanchor = -self.inanchor
|
|
#
|
|
def end_a(self):
|
|
if self.inanchor > 0:
|
|
# Don't show anchors pointing into the current document
|
|
if self.anchors[self.inanchor-1][:1] <> '#':
|
|
self.handle_data('[' + `self.inanchor` + ']')
|
|
self.inanchor = 0
|
|
#
|
|
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
|
|
#
|
|
def do_nextid(self, attrs):
|
|
self.nextid = attrs
|
|
#
|
|
def do_isindex(self, attrs):
|
|
self.isindex = 1
|
|
#
|
|
def start_title(self, attrs):
|
|
self.savetext = ''
|
|
#
|
|
def end_title(self):
|
|
if self.savetext <> None:
|
|
self.title = self.savetext
|
|
self.savetext = None
|
|
#
|
|
def handle_data(self, text):
|
|
if self.savetext is not None:
|
|
self.savetext = self.savetext + text
|
|
|
|
|
|
# Formatting parser -- takes a formatter and a style sheet as arguments
|
|
|
|
# XXX The use of style sheets should change: for each tag and end tag
|
|
# there should be a style definition, and a style definition should
|
|
# encompass many more parameters: font, justification, indentation,
|
|
# vspace before, vspace after, hanging tag...
|
|
|
|
wordprog = regex.compile('[^ \t\n]*')
|
|
spaceprog = regex.compile('[ \t\n]*')
|
|
|
|
class FormattingParser(CollectingParser):
|
|
|
|
def __init__(self, formatter, stylesheet):
|
|
CollectingParser.__init__(self)
|
|
self.fmt = formatter
|
|
self.stl = stylesheet
|
|
self.savetext = None
|
|
self.compact = 0
|
|
self.nofill = 0
|
|
self.resetfont()
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
def resetfont(self):
|
|
self.fontstack = []
|
|
self.stylestack = []
|
|
self.fontset = self.stl.stdfontset
|
|
self.style = ROMAN
|
|
self.passfont()
|
|
|
|
def passfont(self):
|
|
font = self.fontset[self.style]
|
|
self.fmt.setfont(font)
|
|
|
|
def pushstyle(self, style):
|
|
self.stylestack.append(self.style)
|
|
self.style = min(style, len(self.fontset)-1)
|
|
self.passfont()
|
|
|
|
def popstyle(self):
|
|
self.style = self.stylestack[-1]
|
|
del self.stylestack[-1]
|
|
self.passfont()
|
|
|
|
def pushfontset(self, fontset, style):
|
|
self.fontstack.append(self.fontset)
|
|
self.fontset = fontset
|
|
self.pushstyle(style)
|
|
|
|
def popfontset(self):
|
|
self.fontset = self.fontstack[-1]
|
|
del self.fontstack[-1]
|
|
self.popstyle()
|
|
|
|
def flush(self):
|
|
self.fmt.flush()
|
|
|
|
def setindent(self, n):
|
|
self.fmt.setleftindent(n)
|
|
|
|
def needvspace(self, n):
|
|
self.fmt.needvspace(n)
|
|
|
|
def close(self):
|
|
HTMLParser.close(self)
|
|
self.fmt.flush()
|
|
|
|
def handle_literal(self, text):
|
|
lines = string.splitfields(text, '\n')
|
|
for i in range(1, len(lines)):
|
|
lines[i] = string.expandtabs(lines[i], 8)
|
|
for line in lines[:-1]:
|
|
self.fmt.addword(line, 0)
|
|
self.fmt.flush()
|
|
self.fmt.nospace = 0
|
|
for line in lines[-1:]:
|
|
self.fmt.addword(line, 0)
|
|
|
|
def handle_data(self, text):
|
|
if self.savetext is not None:
|
|
self.savetext = self.savetext + text
|
|
return
|
|
if self.literal:
|
|
self.handle_literal(text)
|
|
return
|
|
i = 0
|
|
n = len(text)
|
|
while i < n:
|
|
j = i + wordprog.match(text, i)
|
|
word = text[i:j]
|
|
i = j + spaceprog.match(text, j)
|
|
self.fmt.addword(word, i-j)
|
|
if self.nofill and '\n' in text[j:i]:
|
|
self.fmt.flush()
|
|
self.fmt.nospace = 0
|
|
i = j+1
|
|
while text[i-1] <> '\n': i = i+1
|
|
|
|
def literal_bgn(self, tag, attrs):
|
|
if tag == 'plaintext':
|
|
self.flush()
|
|
else:
|
|
self.needvspace(1)
|
|
self.pushfontset(self.stl.stdfontset, FIXED)
|
|
self.setindent(self.stl.literalindent)
|
|
|
|
def literal_end(self, tag):
|
|
self.needvspace(1)
|
|
self.popfontset()
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
def start_title(self, attrs):
|
|
self.flush()
|
|
self.savetext = ''
|
|
# NB end_title is unchanged
|
|
|
|
def do_p(self, attrs):
|
|
if self.compact:
|
|
self.flush()
|
|
else:
|
|
self.needvspace(1)
|
|
|
|
def start_h1(self, attrs):
|
|
self.needvspace(2)
|
|
self.setindent(self.stl.h1indent)
|
|
self.pushfontset(self.stl.h1fontset, BOLD)
|
|
self.fmt.setjust('c')
|
|
|
|
def end_h1(self):
|
|
self.popfontset()
|
|
self.needvspace(2)
|
|
self.setindent(self.stl.stdindent)
|
|
self.fmt.setjust('l')
|
|
|
|
def start_h2(self, attrs):
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.h2indent)
|
|
self.pushfontset(self.stl.h2fontset, BOLD)
|
|
|
|
def end_h2(self):
|
|
self.popfontset()
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
def start_h3(self, attrs):
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
self.pushfontset(self.stl.h3fontset, BOLD)
|
|
|
|
def end_h3(self):
|
|
self.popfontset()
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
def start_h4(self, attrs):
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
self.pushfontset(self.stl.stdfontset, BOLD)
|
|
|
|
def end_h4(self):
|
|
self.popfontset()
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
start_h5 = start_h4
|
|
end_h5 = end_h4
|
|
|
|
start_h6 = start_h5
|
|
end_h6 = end_h5
|
|
|
|
start_h7 = start_h6
|
|
end_h7 = end_h6
|
|
|
|
def start_ul(self, attrs):
|
|
self.needvspace(1)
|
|
for attrname, value in attrs:
|
|
if attrname == 'compact':
|
|
self.compact = 1
|
|
self.setindent(0)
|
|
break
|
|
else:
|
|
self.setindent(self.stl.ulindent)
|
|
|
|
start_dir = start_menu = start_ol = start_ul
|
|
|
|
do_li = do_p
|
|
|
|
def end_ul(self):
|
|
self.compact = 0
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
end_dir = end_menu = end_ol = end_ul
|
|
|
|
def start_dl(self, attrs):
|
|
for attrname, value in attrs:
|
|
if attrname == 'compact':
|
|
self.compact = 1
|
|
self.needvspace(1)
|
|
|
|
def end_dl(self):
|
|
self.compact = 0
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
def do_dt(self, attrs):
|
|
if self.compact:
|
|
self.flush()
|
|
else:
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
|
|
def do_dd(self, attrs):
|
|
self.fmt.addword('', 1)
|
|
self.setindent(self.stl.ddindent)
|
|
|
|
def start_address(self, attrs):
|
|
self.compact = 1
|
|
self.needvspace(1)
|
|
self.fmt.setjust('r')
|
|
|
|
def end_address(self):
|
|
self.compact = 0
|
|
self.needvspace(1)
|
|
self.setindent(self.stl.stdindent)
|
|
self.fmt.setjust('l')
|
|
|
|
def start_pre(self, attrs):
|
|
self.needvspace(1)
|
|
self.nofill = self.nofill + 1
|
|
self.pushstyle(FIXED)
|
|
|
|
def end_pre(self):
|
|
self.popstyle()
|
|
self.nofill = self.nofill - 1
|
|
self.needvspace(1)
|
|
|
|
start_typewriter = start_pre
|
|
end_typewriter = end_pre
|
|
|
|
def do_img(self, attrs):
|
|
self.fmt.addword('(image)', 0)
|
|
|
|
# Physical styles
|
|
|
|
def start_tt(self, attrs): self.pushstyle(FIXED)
|
|
def end_tt(self): self.popstyle()
|
|
|
|
def start_b(self, attrs): self.pushstyle(BOLD)
|
|
def end_b(self): self.popstyle()
|
|
|
|
def start_i(self, attrs): self.pushstyle(ITALIC)
|
|
def end_i(self): self.popstyle()
|
|
|
|
def start_u(self, attrs): self.pushstyle(ITALIC) # Underline???
|
|
def end_u(self): self.popstyle()
|
|
|
|
def start_r(self, attrs): self.pushstyle(ROMAN) # Not official
|
|
def end_r(self): self.popstyle()
|
|
|
|
# Logical styles
|
|
|
|
start_em = start_i
|
|
end_em = end_i
|
|
|
|
start_strong = start_b
|
|
end_strong = end_b
|
|
|
|
start_code = start_tt
|
|
end_code = end_tt
|
|
|
|
start_samp = start_tt
|
|
end_samp = end_tt
|
|
|
|
start_kbd = start_tt
|
|
end_kbd = end_tt
|
|
|
|
start_file = start_tt # unofficial
|
|
end_file = end_tt
|
|
|
|
start_var = start_i
|
|
end_var = end_i
|
|
|
|
start_dfn = start_i
|
|
end_dfn = end_i
|
|
|
|
start_cite = start_i
|
|
end_cite = end_i
|
|
|
|
start_hp1 = start_i
|
|
end_hp1 = start_i
|
|
|
|
start_hp2 = start_b
|
|
end_hp2 = end_b
|
|
|
|
def unknown_starttag(self, tag, attrs):
|
|
print '*** unknown <' + tag + '>'
|
|
|
|
def unknown_endtag(self, tag):
|
|
print '*** unknown </' + tag + '>'
|
|
|
|
|
|
# An extension of the formatting parser which formats anchors differently.
|
|
class AnchoringParser(FormattingParser):
|
|
|
|
def start_a(self, attrs):
|
|
FormattingParser.start_a(self, attrs)
|
|
if self.inanchor:
|
|
self.fmt.bgn_anchor(self.inanchor)
|
|
|
|
def end_a(self):
|
|
if self.inanchor:
|
|
self.fmt.end_anchor(self.inanchor)
|
|
self.inanchor = 0
|
|
|
|
|
|
# Style sheet -- this is never instantiated, but the attributes
|
|
# of the class object itself are used to specify fonts to be used
|
|
# for various paragraph styles.
|
|
# A font set is a non-empty list of fonts, in the order:
|
|
# [roman, italic, bold, fixed].
|
|
# When a style is not available the nearest lower style is used
|
|
|
|
ROMAN = 0
|
|
ITALIC = 1
|
|
BOLD = 2
|
|
FIXED = 3
|
|
|
|
class NullStylesheet:
|
|
# Fonts -- none
|
|
stdfontset = [None]
|
|
h1fontset = [None]
|
|
h2fontset = [None]
|
|
h3fontset = [None]
|
|
# Indents
|
|
stdindent = 2
|
|
ddindent = 25
|
|
ulindent = 4
|
|
h1indent = 0
|
|
h2indent = 0
|
|
literalindent = 0
|
|
|
|
|
|
class X11Stylesheet(NullStylesheet):
|
|
stdfontset = [
|
|
'-*-helvetica-medium-r-normal-*-*-100-100-*-*-*-*-*',
|
|
'-*-helvetica-medium-o-normal-*-*-100-100-*-*-*-*-*',
|
|
'-*-helvetica-bold-r-normal-*-*-100-100-*-*-*-*-*',
|
|
'-*-courier-medium-r-normal-*-*-100-100-*-*-*-*-*',
|
|
]
|
|
h1fontset = [
|
|
'-*-helvetica-medium-r-normal-*-*-180-100-*-*-*-*-*',
|
|
'-*-helvetica-medium-o-normal-*-*-180-100-*-*-*-*-*',
|
|
'-*-helvetica-bold-r-normal-*-*-180-100-*-*-*-*-*',
|
|
]
|
|
h2fontset = [
|
|
'-*-helvetica-medium-r-normal-*-*-140-100-*-*-*-*-*',
|
|
'-*-helvetica-medium-o-normal-*-*-140-100-*-*-*-*-*',
|
|
'-*-helvetica-bold-r-normal-*-*-140-100-*-*-*-*-*',
|
|
]
|
|
h3fontset = [
|
|
'-*-helvetica-medium-r-normal-*-*-120-100-*-*-*-*-*',
|
|
'-*-helvetica-medium-o-normal-*-*-120-100-*-*-*-*-*',
|
|
'-*-helvetica-bold-r-normal-*-*-120-100-*-*-*-*-*',
|
|
]
|
|
ddindent = 40
|
|
|
|
|
|
class MacStylesheet(NullStylesheet):
|
|
stdfontset = [
|
|
('Geneva', 'p', 10),
|
|
('Geneva', 'i', 10),
|
|
('Geneva', 'b', 10),
|
|
('Monaco', 'p', 10),
|
|
]
|
|
h1fontset = [
|
|
('Geneva', 'p', 18),
|
|
('Geneva', 'i', 18),
|
|
('Geneva', 'b', 18),
|
|
('Monaco', 'p', 18),
|
|
]
|
|
h3fontset = [
|
|
('Geneva', 'p', 14),
|
|
('Geneva', 'i', 14),
|
|
('Geneva', 'b', 14),
|
|
('Monaco', 'p', 14),
|
|
]
|
|
h3fontset = [
|
|
('Geneva', 'p', 12),
|
|
('Geneva', 'i', 12),
|
|
('Geneva', 'b', 12),
|
|
('Monaco', 'p', 12),
|
|
]
|
|
|
|
|
|
if os.name == 'mac':
|
|
StdwinStylesheet = MacStylesheet
|
|
else:
|
|
StdwinStylesheet = X11Stylesheet
|
|
|
|
|
|
class GLStylesheet(NullStylesheet):
|
|
stdfontset = [
|
|
'Helvetica 10',
|
|
'Helvetica-Italic 10',
|
|
'Helvetica-Bold 10',
|
|
'Courier 10',
|
|
]
|
|
h1fontset = [
|
|
'Helvetica 18',
|
|
'Helvetica-Italic 18',
|
|
'Helvetica-Bold 18',
|
|
'Courier 18',
|
|
]
|
|
h2fontset = [
|
|
'Helvetica 14',
|
|
'Helvetica-Italic 14',
|
|
'Helvetica-Bold 14',
|
|
'Courier 14',
|
|
]
|
|
h3fontset = [
|
|
'Helvetica 12',
|
|
'Helvetica-Italic 12',
|
|
'Helvetica-Bold 12',
|
|
'Courier 12',
|
|
]
|
|
|
|
|
|
# Test program -- produces no output but times how long it takes
|
|
# to send a document to a null formatter, exclusive of I/O
|
|
|
|
def test():
|
|
import fmt
|
|
import time
|
|
if sys.argv[1:]: file = sys.argv[1]
|
|
else: file = 'test.html'
|
|
data = open(file, 'r').read()
|
|
t0 = time.time()
|
|
fmtr = fmt.WritingFormatter(sys.stdout, 79)
|
|
p = FormattingParser(fmtr, NullStylesheet)
|
|
p.feed(data)
|
|
p.close()
|
|
t1 = time.time()
|
|
print
|
|
print '*** Formatting time:', round(t1-t0, 3), 'seconds.'
|
|
|
|
|
|
# Test program using stdwin
|
|
|
|
def testStdwin():
|
|
import stdwin, fmt
|
|
from stdwinevents import *
|
|
if sys.argv[1:]: file = sys.argv[1]
|
|
else: file = 'test.html'
|
|
data = open(file, 'r').read()
|
|
window = stdwin.open('testStdwin')
|
|
b = None
|
|
while 1:
|
|
etype, ewin, edetail = stdwin.getevent()
|
|
if etype == WE_CLOSE:
|
|
break
|
|
if etype == WE_SIZE:
|
|
window.setdocsize(0, 0)
|
|
window.setorigin(0, 0)
|
|
window.change((0, 0), (10000, 30000)) # XXX
|
|
if etype == WE_DRAW:
|
|
if not b:
|
|
b = fmt.StdwinBackEnd(window, 1)
|
|
f = fmt.BaseFormatter(b.d, b)
|
|
p = FormattingParser(f, MacStylesheet)
|
|
p.feed(data)
|
|
p.close()
|
|
b.finish()
|
|
else:
|
|
b.redraw(edetail)
|
|
window.close()
|
|
|
|
|
|
# Test program using GL
|
|
|
|
def testGL():
|
|
import gl, GL, fmt
|
|
if sys.argv[1:]: file = sys.argv[1]
|
|
else: file = 'test.html'
|
|
data = open(file, 'r').read()
|
|
W, H = 600, 600
|
|
gl.foreground()
|
|
gl.prefsize(W, H)
|
|
wid = gl.winopen('testGL')
|
|
gl.ortho2(0, W, H, 0)
|
|
gl.color(GL.WHITE)
|
|
gl.clear()
|
|
gl.color(GL.BLACK)
|
|
b = fmt.GLBackEnd(wid)
|
|
f = fmt.BaseFormatter(b.d, b)
|
|
p = FormattingParser(f, GLStylesheet)
|
|
p.feed(data)
|
|
p.close()
|
|
b.finish()
|
|
#
|
|
import time
|
|
time.sleep(5)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
test()
|