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|
# Natural Language Toolkit: Concordance Application
#
# Copyright (C) 2001-2009 NLTK Project
# Author: Sumukh Ghodke <sghodke@csse.unimelb.edu.au>
# URL: <http://www.nltk.org/>
# For license information, see LICENSE.TXT
#
# $Id: concordance.py 6121 2008-07-11 02:10:33Z stevenbird $
import re
from string import join
import threading
from nltk import corpus, in_idle
from nltk.draw.util import *
WORD_OR_TAG = '[^/ ]+'
BOUNDARY = r'\b'
CORPUS_LOADED_EVENT = '<<CL_EVENT>>'
SEARCH_TERMINATED_EVENT = '<<ST_EVENT>>'
SEARCH_ERROR_EVENT = '<<SE_EVENT>>'
ERROR_LOADING_CORPUS_EVENT = '<<ELC_EVENT>>'
# NB All corpora must be specified in a lambda expression so as not to be
# loaded when the module is imported.
_DEFAULT = 'English: Brown Corpus (Humor, simplified)'
_CORPORA = {
'Catalan: CESS-CAT Corpus (simplified)':
lambda: corpus.cess_cat.tagged_sents(simplify_tags=True),
'English: Brown Corpus':
lambda: corpus.brown.tagged_sents(),
'English: Brown Corpus (simplified)':
lambda: corpus.brown.tagged_sents(simplify_tags=True),
'English: Brown Corpus (Press, simplified)':
lambda: corpus.brown.tagged_sents(categories=['news', 'editorial', 'reviews'], simplify_tags=True),
'English: Brown Corpus (Religion, simplified)':
lambda: corpus.brown.tagged_sents(categories='religion', simplify_tags=True),
'English: Brown Corpus (Learned, simplified)':
lambda: corpus.brown.tagged_sents(categories='learned', simplify_tags=True),
'English: Brown Corpus (Science Fiction, simplified)':
lambda: corpus.brown.tagged_sents(categories='science_fiction', simplify_tags=True),
'English: Brown Corpus (Romance, simplified)':
lambda: corpus.brown.tagged_sents(categories='romance', simplify_tags=True),
'English: Brown Corpus (Humor, simplified)':
lambda: corpus.brown.tagged_sents(categories='humor', simplify_tags=True),
'English: NPS Chat Corpus':
lambda: corpus.nps_chat.tagged_posts(),
'English: NPS Chat Corpus (simplified)':
lambda: corpus.nps_chat.tagged_posts(simplify_tags=True),
'English: Wall Street Journal Corpus':
lambda: corpus.treebank.tagged_sents(),
'English: Wall Street Journal Corpus (simplified)':
lambda: corpus.treebank.tagged_sents(simplify_tags=True),
'Chinese: Sinica Corpus':
lambda: corpus.sinica_treebank.tagged_sents(),
'Chinese: Sinica Corpus (simplified)':
lambda: corpus.sinica_treebank.tagged_sents(simplify_tags=True),
'Dutch: Alpino Corpus':
lambda: corpus.alpino.tagged_sents(),
'Dutch: Alpino Corpus (simplified)':
lambda: corpus.alpino.tagged_sents(simplify_tags=True),
'Hindi: Indian Languages Corpus':
lambda: corpus.indian.tagged_sents(files='hindi.pos'),
'Hindi: Indian Languages Corpus (simplified)':
lambda: corpus.indian.tagged_sents(files='hindi.pos', simplify_tags=True),
'Portuguese: Floresta Corpus (Portugal)':
lambda: corpus.floresta.tagged_sents(),
'Portuguese: Floresta Corpus (Portugal, simplified)':
lambda: corpus.floresta.tagged_sents(simplify_tags=True),
'Portuguese: MAC-MORPHO Corpus (Brazil)':
lambda: corpus.mac_morpho.tagged_sents(),
'Portuguese: MAC-MORPHO Corpus (Brazil, simplified)':
lambda: corpus.mac_morpho.tagged_sents(simplify_tags=True),
'Spanish: CESS-ESP Corpus (simplified)':
lambda: corpus.cess_esp.tagged_sents(simplify_tags=True),
}
class ConcordanceSearchView(object):
_BACKGROUND_COLOUR='#FFF' #white
#Colour of highlighted results
_HIGHLIGHT_WORD_COLOUR='#F00' #red
_HIGHLIGHT_WORD_TAG='HL_WRD_TAG'
_HIGHLIGHT_LABEL_COLOUR='#C0C0C0' # dark grey
_HIGHLIGHT_LABEL_TAG='HL_LBL_TAG'
#Percentage of text left of the scrollbar position
_FRACTION_LEFT_TEXT=0.30
def __init__(self):
self.model = ConcordanceSearchModel()
self.model.add_listener(self)
self.top = Tk()
self._init_top(self.top)
self._init_menubar()
self._init_widgets(self.top)
self._bind_event_handlers()
self.load_corpus(self.model.DEFAULT_CORPUS)
def _init_top(self, top):
top.geometry('950x680+50+50')
top.title('NLTK Concordance Search')
top.bind('<Control-q>', self.destroy)
top.minsize(950,680)
def _init_widgets(self, parent):
self.main_frame = Frame(parent, dict(background=self._BACKGROUND_COLOUR, padx=1, pady=1, border=1))
self._init_corpus_select(self.main_frame)
self._init_query_box(self.main_frame)
self._init_results_box(self.main_frame)
self._init_paging(self.main_frame)
self._init_status(self.main_frame)
self.main_frame.pack(fill='both', expand=True)
def _init_menubar(self):
self._result_size = IntVar(self.top)
self._cntx_bf_len = IntVar(self.top)
self._cntx_af_len = IntVar(self.top)
menubar = Menu(self.top)
filemenu = Menu(menubar, tearoff=0, borderwidth=0)
filemenu.add_command(label='Exit', underline=1,
command=self.destroy, accelerator='Ctrl-q')
menubar.add_cascade(label='File', underline=0, menu=filemenu)
editmenu = Menu(menubar, tearoff=0)
rescntmenu = Menu(editmenu, tearoff=0)
rescntmenu.add_radiobutton(label='20', variable=self._result_size,
underline=0, value=20, command=self.set_result_size)
rescntmenu.add_radiobutton(label='50', variable=self._result_size,
underline=0, value=50, command=self.set_result_size)
rescntmenu.add_radiobutton(label='100', variable=self._result_size,
underline=0, value=100, command=self.set_result_size)
rescntmenu.invoke(1)
editmenu.add_cascade(label='Result Count', underline=0, menu=rescntmenu)
cntxmenu = Menu(editmenu, tearoff=0)
cntxbfmenu = Menu(cntxmenu, tearoff=0)
cntxbfmenu.add_radiobutton(label='60 characters', variable=self._cntx_bf_len,
underline=0, value=60, command=self.set_cntx_bf_len)
cntxbfmenu.add_radiobutton(label='80 characters', variable=self._cntx_bf_len,
underline=0, value=80, command=self.set_cntx_bf_len)
cntxbfmenu.add_radiobutton(label='100 characters', variable=self._cntx_bf_len,
underline=0, value=100, command=self.set_cntx_bf_len)
cntxbfmenu.invoke(1)
cntxmenu.add_cascade(label='Before', underline=0, menu=cntxbfmenu)
cntxafmenu = Menu(cntxmenu, tearoff=0)
cntxafmenu.add_radiobutton(label='70 characters', variable=self._cntx_af_len,
underline=0, value=70, command=self.set_cntx_af_len)
cntxafmenu.add_radiobutton(label='90 characters', variable=self._cntx_af_len,
underline=0, value=90, command=self.set_cntx_af_len)
cntxafmenu.add_radiobutton(label='110 characters', variable=self._cntx_af_len,
underline=0, value=110, command=self.set_cntx_af_len)
cntxafmenu.invoke(1)
cntxmenu.add_cascade(label='After', underline=0, menu=cntxafmenu)
editmenu.add_cascade(label='Context', underline=0, menu=cntxmenu)
menubar.add_cascade(label='Edit', underline=0, menu=editmenu)
self.top.config(menu=menubar)
def set_result_size(self, **kwargs):
self.model.result_count = self._result_size.get()
def set_cntx_af_len(self, **kwargs):
self._char_after = self._cntx_af_len.get()
def set_cntx_bf_len(self, **kwargs):
self._char_before = self._cntx_bf_len.get()
def _init_corpus_select(self, parent):
innerframe = Frame(parent, background=self._BACKGROUND_COLOUR)
self.var = StringVar(innerframe)
self.var.set(self.model.DEFAULT_CORPUS)
Label(innerframe, justify=LEFT, text=' Corpus: ', background=self._BACKGROUND_COLOUR, padx = 2, pady = 1, border = 0).pack(side='left')
other_corpora = self.model.CORPORA.keys().remove(self.model.DEFAULT_CORPUS)
om = OptionMenu(innerframe, self.var, self.model.DEFAULT_CORPUS, command=self.corpus_selected, *self.model.non_default_corpora())
om['borderwidth'] = 0
om['highlightthickness'] = 1
om.pack(side='left')
innerframe.pack(side='top', fill='x', anchor='n')
def _init_status(self, parent):
self.status = Label(parent, justify=LEFT, relief=SUNKEN, background=self._BACKGROUND_COLOUR, border=0, padx = 1, pady = 0)
self.status.pack(side='top', anchor='sw')
def _init_query_box(self, parent):
innerframe = Frame(parent, background=self._BACKGROUND_COLOUR)
another = Frame(innerframe, background=self._BACKGROUND_COLOUR)
self.query_box = Entry(another, width=60)
self.query_box.pack(side='left', fill='x', pady=25, anchor='center')
self.search_button = Button(another, text='Search', command=self.search, borderwidth=1, highlightthickness=1)
self.search_button.pack(side='left', fill='x', pady=25, anchor='center')
self.query_box.bind('<KeyPress-Return>', self.search_enter_keypress_handler)
another.pack()
innerframe.pack(side='top', fill='x', anchor='n')
def search_enter_keypress_handler(self, *event):
self.search()
def _init_results_box(self, parent):
innerframe = Frame(parent)
i1 = Frame(innerframe)
i2 = Frame(innerframe)
vscrollbar = Scrollbar(i1, borderwidth=1)
hscrollbar = Scrollbar(i2, borderwidth=1, orient='horiz')
self.results_box = Text(i1,
font=tkFont.Font(family='courier', size='16'),
state='disabled', borderwidth=1,
yscrollcommand=vscrollbar.set,
xscrollcommand=hscrollbar.set, wrap='none', width='40', height = '20', exportselection=1)
self.results_box.pack(side='left', fill='both', expand=True)
self.results_box.tag_config(self._HIGHLIGHT_WORD_TAG, foreground=self._HIGHLIGHT_WORD_COLOUR)
self.results_box.tag_config(self._HIGHLIGHT_LABEL_TAG, foreground=self._HIGHLIGHT_LABEL_COLOUR)
vscrollbar.pack(side='left', fill='y', anchor='e')
vscrollbar.config(command=self.results_box.yview)
hscrollbar.pack(side='left', fill='x', expand=True, anchor='w')
hscrollbar.config(command=self.results_box.xview)
#there is no other way of avoiding the overlap of scrollbars while using pack layout manager!!!
Label(i2, text=' ', background=self._BACKGROUND_COLOUR).pack(side='left', anchor='e')
i1.pack(side='top', fill='both', expand=True, anchor='n')
i2.pack(side='bottom', fill='x', anchor='s')
innerframe.pack(side='top', fill='both', expand=True)
def _init_paging(self, parent):
innerframe = Frame(parent, background=self._BACKGROUND_COLOUR)
self.prev = prev = Button(innerframe, text='Previous', command=self.previous, width='10', borderwidth=1, highlightthickness=1, state='disabled')
prev.pack(side='left', anchor='center')
self.next = next = Button(innerframe, text='Next', command=self.next, width='10', borderwidth=1, highlightthickness=1, state='disabled')
next.pack(side='right', anchor='center')
innerframe.pack(side='top', fill='y')
self.current_page = 0
def previous(self):
self.clear_results_box()
self.freeze_editable()
self.model.prev(self.current_page - 1)
def next(self):
self.clear_results_box()
self.freeze_editable()
self.model.next(self.current_page + 1)
def about(self, *e):
ABOUT = ("NLTK Concordance Search Demo\n")
TITLE = 'About: NLTK Concordance Search Demo'
try:
from tkMessageBox import Message
Message(message=ABOUT, title=TITLE, parent=self.main_frame).show()
except:
ShowText(self.top, TITLE, ABOUT)
def _bind_event_handlers(self):
self.top.bind(CORPUS_LOADED_EVENT, self.handle_corpus_loaded)
self.top.bind(SEARCH_TERMINATED_EVENT, self.handle_search_terminated)
self.top.bind(SEARCH_ERROR_EVENT, self.handle_search_error)
self.top.bind(ERROR_LOADING_CORPUS_EVENT, self.handle_error_loading_corpus)
def handle_error_loading_corpus(self, event):
self.status['text'] = 'Error in loading ' + self.var.get()
self.unfreeze_editable()
self.clear_all()
self.freeze_editable()
def handle_corpus_loaded(self, event):
self.status['text'] = self.var.get() + ' is loaded'
self.unfreeze_editable()
self.clear_all()
self.query_box.focus_set()
def handle_search_terminated(self, event):
#todo: refactor the model such that it is less state sensitive
results = self.model.get_results()
self.write_results(results)
self.status['text'] = ''
if len(results) == 0:
self.status['text'] = 'No results found for ' + self.model.query
else:
self.current_page = self.model.last_requested_page
self.unfreeze_editable()
self.results_box.xview_moveto(self._FRACTION_LEFT_TEXT)
def handle_search_error(self, event):
self.status['text'] = 'Error in query ' + self.model.query
self.unfreeze_editable()
def corpus_selected(self, *args):
new_selection = self.var.get()
self.load_corpus(new_selection)
def load_corpus(self, selection):
if self.model.selected_corpus != selection:
self.status['text'] = 'Loading ' + selection + '...'
self.freeze_editable()
self.model.load_corpus(selection)
def search(self):
self.current_page = 0
self.clear_results_box()
self.model.reset_results()
query = self.query_box.get()
if (len(query.strip()) == 0): return
self.status['text'] = 'Searching for ' + query
self.freeze_editable()
self.model.search(query, self.current_page + 1, )
def write_results(self, results):
self.results_box['state'] = 'normal'
row = 1
for each in results:
sent, pos1, pos2 = each[0].strip(), each[1], each[2]
if len(sent) != 0:
if (pos1 < self._char_before):
sent, pos1, pos2 = self.pad(sent, pos1, pos2)
sentence = sent[pos1-self._char_before:pos1+self._char_after]
if not row == len(results):
sentence += '\n'
self.results_box.insert(str(row) + '.0', sentence)
word_markers, label_markers = self.words_and_labels(sent, pos1, pos2)
for marker in word_markers: self.results_box.tag_add(self._HIGHLIGHT_WORD_TAG, str(row) + '.' + str(marker[0]), str(row) + '.' + str(marker[1]))
for marker in label_markers: self.results_box.tag_add(self._HIGHLIGHT_LABEL_TAG, str(row) + '.' + str(marker[0]), str(row) + '.' + str(marker[1]))
row += 1
self.results_box['state'] = 'disabled'
def words_and_labels(self, sentence, pos1, pos2):
search_exp = sentence[pos1:pos2]
words, labels = [], []
labeled_words = search_exp.split(' ')
index = 0
for each in labeled_words:
if each == '':
index += 1
else:
word, label = each.split('/')
words.append((self._char_before + index, self._char_before + index + len(word)))
index += len(word) + 1
labels.append((self._char_before + index, self._char_before + index + len(label)))
index += len(label)
index += 1
return words, labels
def pad(self, sent, hstart, hend):
if hstart >= self._char_before:
return sent, hstart, hend
d = self._char_before - hstart
sent = ''.join([' '] * d) + sent
return sent, hstart + d, hend + d
def destroy(self, *e):
if self.top is None: return
self.top.destroy()
self.top = None
def clear_all(self):
self.query_box.delete(0, END)
self.model.reset_query()
self.clear_results_box()
def clear_results_box(self):
self.results_box['state'] = 'normal'
self.results_box.delete("1.0", END)
self.results_box['state'] = 'disabled'
def freeze_editable(self):
self.query_box['state'] = 'disabled'
self.search_button['state'] = 'disabled'
self.prev['state'] = 'disabled'
self.next['state'] = 'disabled'
def unfreeze_editable(self):
self.query_box['state'] = 'normal'
self.search_button['state'] = 'normal'
self.set_paging_button_states()
def set_paging_button_states(self):
if self.current_page == 0 or self.current_page == 1:
self.prev['state'] = 'disabled'
else:
self.prev['state'] = 'normal'
if self.model.has_more_pages(self.current_page):
self.next['state'] = 'normal'
else:
self.next['state'] = 'disabled'
def fire_event(self, event):
#Firing an event so that rendering of widgets happen in the mainloop thread
self.top.event_generate(event, when='tail')
def mainloop(self, *args, **kwargs):
if in_idle(): return
self.top.mainloop(*args, **kwargs)
class ConcordanceSearchModel(object):
def __init__(self):
self.listeners = []
self.CORPORA = _CORPORA
self.DEFAULT_CORPUS = _DEFAULT
self.selected_corpus = None
self.reset_query()
self.reset_results()
self.result_count = None
self.last_sent_searched = 0
def non_default_corpora(self):
copy = []
copy.extend(self.CORPORA.keys())
copy.remove(self.DEFAULT_CORPUS)
copy.sort()
return copy
def load_corpus(self, name):
self.selected_corpus = name
self.tagged_sents = []
runner_thread = self.LoadCorpus(name, self)
runner_thread.start()
def search(self, query, page):
self.query = query
self.last_requested_page = page
self.SearchCorpus(self, page, self.result_count).start()
def next(self, page):
self.last_requested_page = page
if len(self.results) < page:
self.search(self.query, page)
else:
self.notify_listeners(SEARCH_TERMINATED_EVENT)
def prev(self, page):
self.last_requested_page = page
self.notify_listeners(SEARCH_TERMINATED_EVENT)
def add_listener(self, listener):
self.listeners.append(listener)
def notify_listeners(self, event):
for each in self.listeners:
each.fire_event(event)
def reset_results(self):
self.last_sent_searched = 0
self.results = []
self.last_page = None
def reset_query(self):
self.query = None
def set_results(self, page, resultset):
self.results.insert(page - 1, resultset)
def get_results(self):
return self.results[self.last_requested_page - 1]
def has_more_pages(self, page):
if self.results == [] or self.results[0] == []:
return False
if self.last_page == None:
return True
return page < self.last_page
class LoadCorpus(threading.Thread):
def __init__(self, name, model):
self.model, self.name = model, name
threading.Thread.__init__(self)
def run(self):
try:
ts = self.model.CORPORA[self.name]()
self.model.tagged_sents = [join(w+'/'+t for (w,t) in sent) for sent in ts]
self.model.notify_listeners(CORPUS_LOADED_EVENT)
except Exception, e:
print e
self.model.notify_listeners(ERROR_LOADING_CORPUS_EVENT)
class SearchCorpus(threading.Thread):
def __init__(self, model, page, count):
self.model, self.count, self.page = model, count, page
threading.Thread.__init__(self)
def run(self):
q = self.processed_query()
sent_pos, i, sent_count = [], 0, 0
for sent in self.model.tagged_sents[self.model.last_sent_searched:]:
try:
m = re.search(q, sent)
except re.error:
self.model.reset_results()
self.model.notify_listeners(SEARCH_ERROR_EVENT)
return
if m:
sent_pos.append((sent, m.start(), m.end()))
i += 1
if i > self.count:
self.model.last_sent_searched += sent_count - 1
break
sent_count += 1
if (self.count >= len(sent_pos)):
self.model.last_sent_searched += sent_count - 1
self.model.last_page = self.page
self.model.set_results(self.page, sent_pos)
else:
self.model.set_results(self.page, sent_pos[:-1])
self.model.notify_listeners(SEARCH_TERMINATED_EVENT)
def processed_query(self):
new = []
for term in self.model.query.split():
term = re.sub(r'\.', r'[^/ ]', term)
if re.match('[A-Z]+$', term):
new.append(BOUNDARY + WORD_OR_TAG + '/' + term + BOUNDARY)
elif '/' in term:
new.append(BOUNDARY + term + BOUNDARY)
else:
new.append(BOUNDARY + term + '/' + WORD_OR_TAG + BOUNDARY)
return ' '.join(new)
def app():
d = ConcordanceSearchView()
d.mainloop()
if __name__ == '__main__':
app()
__all__ = ['app']
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