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import sys, sgmllib, xml.sax.saxutils, sym
def attrs_to_str(d):
if len(d) == 0:
return ""
l = [""]+["%s=%s" % (name, xml.sax.saxutils.quoteattr(value)) for (name, value) in d]
return " ".join(l)
def attrs_to_dict(a):
d = {}
for (name, value) in a:
if d.has_key(name.lower()):
raise ValueError, "duplicate attribute names"
d[name.lower()] = value
return d
class Sentence(object):
def __init__(self, words=None, meta=None):
if words is not None:
self.words = list(words)
else:
self.words = []
if meta is not None:
self.meta = meta
else:
self.meta = []
def copy(self):
return Sentence(self.words, list(self.meta))
def mark(self, tag, attrs):
self.meta.append((tag, attrs, 0, len(self.words)))
def getmark(self):
if len(self.meta) > 0:
(tag, attrs, i, j) = self.meta[-1]
if i == 0 and j == len(self.words):
return (tag, attrs)
else:
return None
else:
return None
def unmark(self):
mark = self.getmark()
if mark is not None:
self.meta = self.meta[:-1]
return mark
def __cmp__(self, other):
return cmp((self.words, self.meta), (other.words, other.meta))
def __str__(self):
def cmp_spans((tag1,attr1,i1,j1),(tag2,attr2,i2,j2)):
if i1==i2<=j1==j2:
return 0
elif i2<=i1<=j1<=j2:
return -1
elif i1<=i2<=j2<=j1:
return 1
else:
return cmp((i1,j1),(i2,j2)) # don't care
# this guarantees that equal spans will come out nested
# we want the later spans to be outer
# this relies on stable sort
open = [[] for i in xrange(len(self.words)+1)]
# there seems to be a bug still with empty spans
empty = [[] for i in xrange(len(self.words)+1)]
close = [[] for j in xrange(len(self.words)+1)]
for (tag,attrs,i,j) in sorted(self.meta, cmp=cmp_spans):
if i == j:
# do we want these to nest?
empty[i].append("<%s%s></%s>\n" % (tag, attrs_to_str(attrs), tag))
else:
open[i].append("<%s%s>\n" % (tag, attrs_to_str(attrs)))
close[j].append("</%s>\n" % tag)
result = []
if len(empty[0]) > 0:
result.extend(empty[0])
for i in xrange(len(self.words)):
if i > 0:
result.append(" ")
result.extend(reversed(open[i]))
result.append(xml.sax.saxutils.escape(sym.tostring(self.words[i])))
result.extend(close[i+1])
if len(empty[i+1]) > 0:
result.extend(empty[i+1])
return "".join(result)
def __add__(self, other):
if type(other) in (list, tuple):
return Sentence(self.words + list(other), self.meta)
else:
othermeta = [(tag, attrs, i+len(self.words), j+len(self.words)) for (tag, attrs, i, j) in other.meta]
return Sentence(self.words + other.words, self.meta+othermeta)
def read_raw(f):
"""Read a raw file into a list of Sentences."""
if type(f) is str:
f = file(f, "r")
i = 0
line = f.readline()
while line != "":
sent = process_sgml_line(line, i)
mark = sent.getmark()
if mark is None:
sent.mark('seg', [('id',str(i))])
else:
(tag, attrs) = mark
if tag == "seg" and not attrs_to_dict(attrs).has_key('id'):
x = ('id',str(i))
attrs.append(x)
sent.mark('seg', attrs)
if tag != "seg":
sent.mark('seg', [('id',str(i))])
yield sent
i += 1
line = f.readline()
def process_sgml_line(line, id=None):
p = DatasetParser(None)
p.pos = 0
p.words = []
p.meta = []
p.feed(line)
p.close()
sent = Sentence(p.words, p.meta)
return sent
class DatasetParser(sgmllib.SGMLParser):
def __init__(self, set):
sgmllib.SGMLParser.__init__(self)
self.words = None
self.mystack = []
self.string = None
self.convref = d = {"amp":"&", "lt":"<", "gt":">", "quot":'"', "squot":"'"}
def close(self):
self.convert()
sgmllib.SGMLParser.close(self)
def handle_starttag(self, tag, method, attrs):
thing = method(attrs)
self.mystack.append(thing)
def handle_endtag(self, tag, method):
thing = self.mystack.pop()
method(thing)
def unknown_starttag(self, tag, attrs):
thing = self.start(tag, attrs)
self.mystack.append(thing)
def unknown_endtag(self, tag):
thing = self.mystack.pop()
self.end(tag, thing)
def start(self, tag, attrs):
self.convert()
if self.words is not None:
return (tag, attrs, self.pos, None)
else:
return None
def convert(self):
if self.words is not None and self.string is not None:
words = self.string.split()
self.pos += len(words)
self.words.extend(words)
self.string = None
def end(self, tag, thing):
self.convert()
if self.words is not None:
(tag, attrs, i, j) = thing
self.meta.append((tag, attrs, i, self.pos))
def handle_data(self, s):
if self.words is not None:
if (self.string is None):
self.string = s
else:
self.string += s
def handle_entityref(self, ref):
# s=self.convert_entityref(ref) # if python 2.5
s=self.convref[ref]
if self.words is not None:
if (self.string is None):
self.string = s
else:
self.string += s
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