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# Natural Language Toolkit: NKJP Corpus Reader
#
# Copyright (C) 2001-2023 NLTK Project
# Author: Gabriela Kaczka
# URL: <https://www.nltk.org/>
# For license information, see LICENSE.TXT
import functools
import os
import re
import tempfile
from nltk.corpus.reader.util import concat
from nltk.corpus.reader.xmldocs import XMLCorpusReader, XMLCorpusView
def _parse_args(fun):
"""
Wraps function arguments:
if fileids not specified then function set NKJPCorpusReader paths.
"""
@functools.wraps(fun)
def decorator(self, fileids=None, **kwargs):
if not fileids:
fileids = self._paths
return fun(self, fileids, **kwargs)
return decorator
class NKJPCorpusReader(XMLCorpusReader):
WORDS_MODE = 0
SENTS_MODE = 1
HEADER_MODE = 2
RAW_MODE = 3
def __init__(self, root, fileids=".*"):
"""
Corpus reader designed to work with National Corpus of Polish.
See http://nkjp.pl/ for more details about NKJP.
use example:
import nltk
import nkjp
from nkjp import NKJPCorpusReader
x = NKJPCorpusReader(root='/home/USER/nltk_data/corpora/nkjp/', fileids='') # obtain the whole corpus
x.header()
x.raw()
x.words()
x.tagged_words(tags=['subst', 'comp']) #Link to find more tags: nkjp.pl/poliqarp/help/ense2.html
x.sents()
x = NKJPCorpusReader(root='/home/USER/nltk_data/corpora/nkjp/', fileids='Wilk*') # obtain particular file(s)
x.header(fileids=['WilkDom', '/home/USER/nltk_data/corpora/nkjp/WilkWilczy'])
x.tagged_words(fileids=['WilkDom', '/home/USER/nltk_data/corpora/nkjp/WilkWilczy'], tags=['subst', 'comp'])
"""
if isinstance(fileids, str):
XMLCorpusReader.__init__(self, root, fileids + ".*/header.xml")
else:
XMLCorpusReader.__init__(
self, root, [fileid + "/header.xml" for fileid in fileids]
)
self._paths = self.get_paths()
def get_paths(self):
return [
os.path.join(str(self._root), f.split("header.xml")[0])
for f in self._fileids
]
def fileids(self):
"""
Returns a list of file identifiers for the fileids that make up
this corpus.
"""
return [f.split("header.xml")[0] for f in self._fileids]
def _view(self, filename, tags=None, **kwargs):
"""
Returns a view specialised for use with particular corpus file.
"""
mode = kwargs.pop("mode", NKJPCorpusReader.WORDS_MODE)
if mode is NKJPCorpusReader.WORDS_MODE:
return NKJPCorpus_Morph_View(filename, tags=tags)
elif mode is NKJPCorpusReader.SENTS_MODE:
return NKJPCorpus_Segmentation_View(filename, tags=tags)
elif mode is NKJPCorpusReader.HEADER_MODE:
return NKJPCorpus_Header_View(filename, tags=tags)
elif mode is NKJPCorpusReader.RAW_MODE:
return NKJPCorpus_Text_View(
filename, tags=tags, mode=NKJPCorpus_Text_View.RAW_MODE
)
else:
raise NameError("No such mode!")
def add_root(self, fileid):
"""
Add root if necessary to specified fileid.
"""
if self.root in fileid:
return fileid
return self.root + fileid
@_parse_args
def header(self, fileids=None, **kwargs):
"""
Returns header(s) of specified fileids.
"""
return concat(
[
self._view(
self.add_root(fileid), mode=NKJPCorpusReader.HEADER_MODE, **kwargs
).handle_query()
for fileid in fileids
]
)
@_parse_args
def sents(self, fileids=None, **kwargs):
"""
Returns sentences in specified fileids.
"""
return concat(
[
self._view(
self.add_root(fileid), mode=NKJPCorpusReader.SENTS_MODE, **kwargs
).handle_query()
for fileid in fileids
]
)
@_parse_args
def words(self, fileids=None, **kwargs):
"""
Returns words in specified fileids.
"""
return concat(
[
self._view(
self.add_root(fileid), mode=NKJPCorpusReader.WORDS_MODE, **kwargs
).handle_query()
for fileid in fileids
]
)
@_parse_args
def tagged_words(self, fileids=None, **kwargs):
"""
Call with specified tags as a list, e.g. tags=['subst', 'comp'].
Returns tagged words in specified fileids.
"""
tags = kwargs.pop("tags", [])
return concat(
[
self._view(
self.add_root(fileid),
mode=NKJPCorpusReader.WORDS_MODE,
tags=tags,
**kwargs
).handle_query()
for fileid in fileids
]
)
@_parse_args
def raw(self, fileids=None, **kwargs):
"""
Returns words in specified fileids.
"""
return concat(
[
self._view(
self.add_root(fileid), mode=NKJPCorpusReader.RAW_MODE, **kwargs
).handle_query()
for fileid in fileids
]
)
class NKJPCorpus_Header_View(XMLCorpusView):
def __init__(self, filename, **kwargs):
"""
HEADER_MODE
A stream backed corpus view specialized for use with
header.xml files in NKJP corpus.
"""
self.tagspec = ".*/sourceDesc$"
XMLCorpusView.__init__(self, filename + "header.xml", self.tagspec)
def handle_query(self):
self._open()
header = []
while True:
segm = XMLCorpusView.read_block(self, self._stream)
if len(segm) == 0:
break
header.extend(segm)
self.close()
return header
def handle_elt(self, elt, context):
titles = elt.findall("bibl/title")
title = []
if titles:
title = "\n".join(title.text.strip() for title in titles)
authors = elt.findall("bibl/author")
author = []
if authors:
author = "\n".join(author.text.strip() for author in authors)
dates = elt.findall("bibl/date")
date = []
if dates:
date = "\n".join(date.text.strip() for date in dates)
publishers = elt.findall("bibl/publisher")
publisher = []
if publishers:
publisher = "\n".join(publisher.text.strip() for publisher in publishers)
idnos = elt.findall("bibl/idno")
idno = []
if idnos:
idno = "\n".join(idno.text.strip() for idno in idnos)
notes = elt.findall("bibl/note")
note = []
if notes:
note = "\n".join(note.text.strip() for note in notes)
return {
"title": title,
"author": author,
"date": date,
"publisher": publisher,
"idno": idno,
"note": note,
}
class XML_Tool:
"""
Helper class creating xml file to one without references to nkjp: namespace.
That's needed because the XMLCorpusView assumes that one can find short substrings
of XML that are valid XML, which is not true if a namespace is declared at top level
"""
def __init__(self, root, filename):
self.read_file = os.path.join(root, filename)
self.write_file = tempfile.NamedTemporaryFile(delete=False)
def build_preprocessed_file(self):
try:
fr = open(self.read_file)
fw = self.write_file
line = " "
while len(line):
line = fr.readline()
x = re.split(r"nkjp:[^ ]* ", line) # in all files
ret = " ".join(x)
x = re.split("<nkjp:paren>", ret) # in ann_segmentation.xml
ret = " ".join(x)
x = re.split("</nkjp:paren>", ret) # in ann_segmentation.xml
ret = " ".join(x)
x = re.split("<choice>", ret) # in ann_segmentation.xml
ret = " ".join(x)
x = re.split("</choice>", ret) # in ann_segmentation.xml
ret = " ".join(x)
fw.write(ret)
fr.close()
fw.close()
return self.write_file.name
except Exception as e:
self.remove_preprocessed_file()
raise Exception from e
def remove_preprocessed_file(self):
os.remove(self.write_file.name)
class NKJPCorpus_Segmentation_View(XMLCorpusView):
"""
A stream backed corpus view specialized for use with
ann_segmentation.xml files in NKJP corpus.
"""
def __init__(self, filename, **kwargs):
self.tagspec = ".*p/.*s"
# intersperse NKJPCorpus_Text_View
self.text_view = NKJPCorpus_Text_View(
filename, mode=NKJPCorpus_Text_View.SENTS_MODE
)
self.text_view.handle_query()
# xml preprocessing
self.xml_tool = XML_Tool(filename, "ann_segmentation.xml")
# base class init
XMLCorpusView.__init__(
self, self.xml_tool.build_preprocessed_file(), self.tagspec
)
def get_segm_id(self, example_word):
return example_word.split("(")[1].split(",")[0]
def get_sent_beg(self, beg_word):
# returns index of beginning letter in sentence
return int(beg_word.split(",")[1])
def get_sent_end(self, end_word):
# returns index of end letter in sentence
splitted = end_word.split(")")[0].split(",")
return int(splitted[1]) + int(splitted[2])
def get_sentences(self, sent_segm):
# returns one sentence
id = self.get_segm_id(sent_segm[0])
segm = self.text_view.segm_dict[id] # text segment
beg = self.get_sent_beg(sent_segm[0])
end = self.get_sent_end(sent_segm[len(sent_segm) - 1])
return segm[beg:end]
def remove_choice(self, segm):
ret = []
prev_txt_end = -1
prev_txt_nr = -1
for word in segm:
txt_nr = self.get_segm_id(word)
# get increasing sequence of ids: in case of choice get first possibility
if self.get_sent_beg(word) > prev_txt_end - 1 or prev_txt_nr != txt_nr:
ret.append(word)
prev_txt_end = self.get_sent_end(word)
prev_txt_nr = txt_nr
return ret
def handle_query(self):
try:
self._open()
sentences = []
while True:
sent_segm = XMLCorpusView.read_block(self, self._stream)
if len(sent_segm) == 0:
break
for segm in sent_segm:
segm = self.remove_choice(segm)
sentences.append(self.get_sentences(segm))
self.close()
self.xml_tool.remove_preprocessed_file()
return sentences
except Exception as e:
self.xml_tool.remove_preprocessed_file()
raise Exception from e
def handle_elt(self, elt, context):
ret = []
for seg in elt:
ret.append(seg.get("corresp"))
return ret
class NKJPCorpus_Text_View(XMLCorpusView):
"""
A stream backed corpus view specialized for use with
text.xml files in NKJP corpus.
"""
SENTS_MODE = 0
RAW_MODE = 1
def __init__(self, filename, **kwargs):
self.mode = kwargs.pop("mode", 0)
self.tagspec = ".*/div/ab"
self.segm_dict = dict()
# xml preprocessing
self.xml_tool = XML_Tool(filename, "text.xml")
# base class init
XMLCorpusView.__init__(
self, self.xml_tool.build_preprocessed_file(), self.tagspec
)
def handle_query(self):
try:
self._open()
x = self.read_block(self._stream)
self.close()
self.xml_tool.remove_preprocessed_file()
return x
except Exception as e:
self.xml_tool.remove_preprocessed_file()
raise Exception from e
def read_block(self, stream, tagspec=None, elt_handler=None):
"""
Returns text as a list of sentences.
"""
txt = []
while True:
segm = XMLCorpusView.read_block(self, stream)
if len(segm) == 0:
break
for part in segm:
txt.append(part)
return [" ".join([segm for segm in txt])]
def get_segm_id(self, elt):
for attr in elt.attrib:
if attr.endswith("id"):
return elt.get(attr)
def handle_elt(self, elt, context):
# fill dictionary to use later in sents mode
if self.mode is NKJPCorpus_Text_View.SENTS_MODE:
self.segm_dict[self.get_segm_id(elt)] = elt.text
return elt.text
class NKJPCorpus_Morph_View(XMLCorpusView):
"""
A stream backed corpus view specialized for use with
ann_morphosyntax.xml files in NKJP corpus.
"""
def __init__(self, filename, **kwargs):
self.tags = kwargs.pop("tags", None)
self.tagspec = ".*/seg/fs"
self.xml_tool = XML_Tool(filename, "ann_morphosyntax.xml")
XMLCorpusView.__init__(
self, self.xml_tool.build_preprocessed_file(), self.tagspec
)
def handle_query(self):
try:
self._open()
words = []
while True:
segm = XMLCorpusView.read_block(self, self._stream)
if len(segm) == 0:
break
for part in segm:
if part is not None:
words.append(part)
self.close()
self.xml_tool.remove_preprocessed_file()
return words
except Exception as e:
self.xml_tool.remove_preprocessed_file()
raise Exception from e
def handle_elt(self, elt, context):
word = ""
flag = False
is_not_interp = True
# if tags not specified, then always return word
if self.tags is None:
flag = True
for child in elt:
# get word
if "name" in child.keys() and child.attrib["name"] == "orth":
for symbol in child:
if symbol.tag == "string":
word = symbol.text
elif "name" in child.keys() and child.attrib["name"] == "interps":
for symbol in child:
if "type" in symbol.keys() and symbol.attrib["type"] == "lex":
for symbol2 in symbol:
if (
"name" in symbol2.keys()
and symbol2.attrib["name"] == "ctag"
):
for symbol3 in symbol2:
if (
"value" in symbol3.keys()
and self.tags is not None
and symbol3.attrib["value"] in self.tags
):
flag = True
elif (
"value" in symbol3.keys()
and symbol3.attrib["value"] == "interp"
):
is_not_interp = False
if flag and is_not_interp:
return word
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