485 lines
18 KiB
Python
485 lines
18 KiB
Python
# Natural Language Toolkit: GUI Demo for Glue Semantics with Discourse
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# Representation Theory (DRT) as meaning language
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#
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# Author: Dan Garrette <dhgarrette@gmail.com>
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#
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# Copyright (C) 2001-2018 NLTK Project
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# URL: <http://nltk.org/>
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# For license information, see LICENSE.TXT
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try:
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from six.moves.tkinter import (Button, Frame, IntVar, Label, Listbox, Menu,
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Scrollbar, Tk)
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from six.moves.tkinter_font import Font
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from nltk.draw.util import CanvasFrame, ShowText
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except ImportError:
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"""Ignore ImportError because tkinter might not be available."""
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from nltk.util import in_idle
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from nltk.tag import RegexpTagger
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from nltk.parse import MaltParser
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from nltk.sem.logic import Variable
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from nltk.sem.drt import DrsDrawer, DrtVariableExpression
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from nltk.sem.glue import DrtGlue
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class DrtGlueDemo(object):
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def __init__(self, examples):
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# Set up the main window.
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self._top = Tk()
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self._top.title('DRT Glue Demo')
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# Set up key bindings.
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self._init_bindings()
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# Initialize the fonts.self._error = None
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self._init_fonts(self._top)
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self._examples = examples
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self._readingCache = [None for example in examples]
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# The user can hide the grammar.
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self._show_grammar = IntVar(self._top)
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self._show_grammar.set(1)
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# Set the data to None
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self._curExample = -1
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self._readings = []
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self._drs = None
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self._drsWidget = None
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self._error = None
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self._init_glue()
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# Create the basic frames.
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self._init_menubar(self._top)
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self._init_buttons(self._top)
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self._init_exampleListbox(self._top)
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self._init_readingListbox(self._top)
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self._init_canvas(self._top)
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# Resize callback
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self._canvas.bind('<Configure>', self._configure)
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#########################################
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## Initialization Helpers
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#########################################
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def _init_glue(self):
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tagger = RegexpTagger(
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[('^(David|Mary|John)$', 'NNP'),
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('^(walks|sees|eats|chases|believes|gives|sleeps|chases|persuades|tries|seems|leaves)$', 'VB'),
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('^(go|order|vanish|find|approach)$', 'VB'),
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('^(a)$', 'ex_quant'),
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('^(every)$', 'univ_quant'),
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('^(sandwich|man|dog|pizza|unicorn|cat|senator)$', 'NN'),
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('^(big|gray|former)$', 'JJ'),
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('^(him|himself)$', 'PRP')
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])
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depparser = MaltParser(tagger=tagger)
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self._glue = DrtGlue(depparser=depparser, remove_duplicates=False)
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def _init_fonts(self, root):
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# See: <http://www.astro.washington.edu/owen/ROTKFolklore.html>
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self._sysfont = Font(font=Button()["font"])
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root.option_add("*Font", self._sysfont)
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# TWhat's our font size (default=same as sysfont)
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self._size = IntVar(root)
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self._size.set(self._sysfont.cget('size'))
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self._boldfont = Font(family='helvetica', weight='bold',
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size=self._size.get())
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self._font = Font(family='helvetica',
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size=self._size.get())
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if self._size.get() < 0: big = self._size.get()-2
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else: big = self._size.get()+2
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self._bigfont = Font(family='helvetica', weight='bold',
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size=big)
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def _init_exampleListbox(self, parent):
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self._exampleFrame = listframe = Frame(parent)
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self._exampleFrame.pack(fill='both', side='left', padx=2)
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self._exampleList_label = Label(self._exampleFrame, font=self._boldfont,
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text='Examples')
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self._exampleList_label.pack()
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self._exampleList = Listbox(self._exampleFrame, selectmode='single',
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relief='groove', background='white',
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foreground='#909090', font=self._font,
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selectforeground='#004040',
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selectbackground='#c0f0c0')
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self._exampleList.pack(side='right', fill='both', expand=1)
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for example in self._examples:
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self._exampleList.insert('end', (' %s' % example))
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self._exampleList.config(height=min(len(self._examples), 25), width=40)
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# Add a scrollbar if there are more than 25 examples.
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if len(self._examples) > 25:
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listscroll = Scrollbar(self._exampleFrame,
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orient='vertical')
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self._exampleList.config(yscrollcommand = listscroll.set)
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listscroll.config(command=self._exampleList.yview)
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listscroll.pack(side='left', fill='y')
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# If they select a example, apply it.
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self._exampleList.bind('<<ListboxSelect>>', self._exampleList_select)
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def _init_readingListbox(self, parent):
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self._readingFrame = listframe = Frame(parent)
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self._readingFrame.pack(fill='both', side='left', padx=2)
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self._readingList_label = Label(self._readingFrame, font=self._boldfont,
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text='Readings')
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self._readingList_label.pack()
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self._readingList = Listbox(self._readingFrame, selectmode='single',
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relief='groove', background='white',
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foreground='#909090', font=self._font,
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selectforeground='#004040',
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selectbackground='#c0f0c0')
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self._readingList.pack(side='right', fill='both', expand=1)
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# Add a scrollbar if there are more than 25 examples.
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listscroll = Scrollbar(self._readingFrame,
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orient='vertical')
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self._readingList.config(yscrollcommand = listscroll.set)
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listscroll.config(command=self._readingList.yview)
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listscroll.pack(side='right', fill='y')
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self._populate_readingListbox()
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def _populate_readingListbox(self):
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# Populate the listbox with integers
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self._readingList.delete(0, 'end')
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for i in range(len(self._readings)):
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self._readingList.insert('end', (' %s' % (i+1)))
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self._readingList.config(height=min(len(self._readings), 25), width=5)
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# If they select a example, apply it.
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self._readingList.bind('<<ListboxSelect>>', self._readingList_select)
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def _init_bindings(self):
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# Key bindings are a good thing.
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self._top.bind('<Control-q>', self.destroy)
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self._top.bind('<Control-x>', self.destroy)
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self._top.bind('<Escape>', self.destroy)
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self._top.bind('n', self.next)
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self._top.bind('<space>', self.next)
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self._top.bind('p', self.prev)
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self._top.bind('<BackSpace>', self.prev)
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def _init_buttons(self, parent):
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# Set up the frames.
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self._buttonframe = buttonframe = Frame(parent)
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buttonframe.pack(fill='none', side='bottom', padx=3, pady=2)
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Button(buttonframe, text='Prev',
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background='#90c0d0', foreground='black',
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command=self.prev,).pack(side='left')
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Button(buttonframe, text='Next',
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background='#90c0d0', foreground='black',
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command=self.next,).pack(side='left')
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def _configure(self, event):
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self._autostep = 0
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(x1, y1, x2, y2) = self._cframe.scrollregion()
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y2 = event.height - 6
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self._canvas['scrollregion'] = '%d %d %d %d' % (x1,y1,x2,y2)
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self._redraw()
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def _init_canvas(self, parent):
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self._cframe = CanvasFrame(parent, background='white',
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#width=525, height=250,
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closeenough=10,
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border=2, relief='sunken')
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self._cframe.pack(expand=1, fill='both', side='top', pady=2)
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canvas = self._canvas = self._cframe.canvas()
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# Initially, there's no tree or text
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self._tree = None
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self._textwidgets = []
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self._textline = None
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def _init_menubar(self, parent):
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menubar = Menu(parent)
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filemenu = Menu(menubar, tearoff=0)
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filemenu.add_command(label='Exit', underline=1,
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command=self.destroy, accelerator='q')
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menubar.add_cascade(label='File', underline=0, menu=filemenu)
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actionmenu = Menu(menubar, tearoff=0)
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actionmenu.add_command(label='Next', underline=0,
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command=self.next, accelerator='n, Space')
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actionmenu.add_command(label='Previous', underline=0,
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command=self.prev, accelerator='p, Backspace')
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menubar.add_cascade(label='Action', underline=0, menu=actionmenu)
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optionmenu = Menu(menubar, tearoff=0)
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optionmenu.add_checkbutton(label='Remove Duplicates', underline=0,
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variable=self._glue.remove_duplicates,
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command=self._toggle_remove_duplicates,
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accelerator='r')
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menubar.add_cascade(label='Options', underline=0, menu=optionmenu)
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viewmenu = Menu(menubar, tearoff=0)
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viewmenu.add_radiobutton(label='Tiny', variable=self._size,
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underline=0, value=10, command=self.resize)
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viewmenu.add_radiobutton(label='Small', variable=self._size,
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underline=0, value=12, command=self.resize)
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viewmenu.add_radiobutton(label='Medium', variable=self._size,
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underline=0, value=14, command=self.resize)
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viewmenu.add_radiobutton(label='Large', variable=self._size,
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underline=0, value=18, command=self.resize)
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viewmenu.add_radiobutton(label='Huge', variable=self._size,
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underline=0, value=24, command=self.resize)
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menubar.add_cascade(label='View', underline=0, menu=viewmenu)
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helpmenu = Menu(menubar, tearoff=0)
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helpmenu.add_command(label='About', underline=0,
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command=self.about)
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menubar.add_cascade(label='Help', underline=0, menu=helpmenu)
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parent.config(menu=menubar)
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#########################################
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## Main draw procedure
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#########################################
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def _redraw(self):
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canvas = self._canvas
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# Delete the old DRS, widgets, etc.
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if self._drsWidget is not None:
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self._drsWidget.clear()
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if self._drs:
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self._drsWidget = DrsWidget( self._canvas, self._drs )
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self._drsWidget.draw()
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if self._error:
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self._drsWidget = DrsWidget( self._canvas, self._error )
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self._drsWidget.draw()
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#########################################
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## Button Callbacks
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#########################################
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def destroy(self, *e):
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self._autostep = 0
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if self._top is None: return
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self._top.destroy()
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self._top = None
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def prev(self, *e):
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selection = self._readingList.curselection()
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readingListSize = self._readingList.size()
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# there are readings
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if readingListSize > 0:
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# if one reading is currently selected
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if len(selection) == 1:
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index = int(selection[0])
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# if it's on (or before) the first item
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if index <= 0:
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self._select_previous_example()
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else:
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self._readingList_store_selection(index-1)
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else:
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#select its first reading
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self._readingList_store_selection(readingListSize-1)
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else:
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self._select_previous_example()
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def _select_previous_example(self):
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#if the current example is not the first example
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if self._curExample > 0:
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self._exampleList_store_selection(self._curExample-1)
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else:
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#go to the last example
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self._exampleList_store_selection(len(self._examples)-1)
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def next(self, *e):
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selection = self._readingList.curselection()
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readingListSize = self._readingList.size()
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# if there are readings
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if readingListSize > 0:
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# if one reading is currently selected
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if len(selection) == 1:
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index = int(selection[0])
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# if it's on (or past) the last item
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if index >= (readingListSize-1):
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self._select_next_example()
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else:
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self._readingList_store_selection(index+1)
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else:
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#select its first reading
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self._readingList_store_selection(0)
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else:
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self._select_next_example()
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def _select_next_example(self):
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#if the current example is not the last example
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if self._curExample < len(self._examples)-1:
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self._exampleList_store_selection(self._curExample+1)
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else:
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#go to the first example
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self._exampleList_store_selection(0)
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def about(self, *e):
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ABOUT = ("NLTK Discourse Representation Theory (DRT) Glue Semantics Demo\n"+
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"Written by Daniel H. Garrette")
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TITLE = 'About: NLTK DRT Glue Demo'
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try:
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from six.moves.tkinter_messagebox import Message
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Message(message=ABOUT, title=TITLE).show()
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except:
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ShowText(self._top, TITLE, ABOUT)
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def postscript(self, *e):
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self._autostep = 0
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self._cframe.print_to_file()
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def mainloop(self, *args, **kwargs):
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"""
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Enter the Tkinter mainloop. This function must be called if
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this demo is created from a non-interactive program (e.g.
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from a secript); otherwise, the demo will close as soon as
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the script completes.
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"""
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if in_idle(): return
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self._top.mainloop(*args, **kwargs)
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def resize(self, size=None):
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if size is not None: self._size.set(size)
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size = self._size.get()
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self._font.configure(size=-(abs(size)))
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self._boldfont.configure(size=-(abs(size)))
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self._sysfont.configure(size=-(abs(size)))
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self._bigfont.configure(size=-(abs(size+2)))
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self._redraw()
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def _toggle_remove_duplicates(self):
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self._glue.remove_duplicates = not self._glue.remove_duplicates
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self._exampleList.selection_clear(0, 'end')
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self._readings = []
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self._populate_readingListbox()
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self._readingCache = [None for ex in self._examples]
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self._curExample = -1
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self._error = None
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self._drs = None
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self._redraw()
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def _exampleList_select(self, event):
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selection = self._exampleList.curselection()
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if len(selection) != 1: return
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self._exampleList_store_selection(int(selection[0]))
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def _exampleList_store_selection(self, index):
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self._curExample = index
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example = self._examples[index]
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self._exampleList.selection_clear(0, 'end')
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if example:
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cache = self._readingCache[index]
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if cache:
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if isinstance(cache, list):
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self._readings = cache
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self._error = None
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else:
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self._readings = []
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self._error = cache
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else:
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try:
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self._readings = self._glue.parse_to_meaning(example)
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self._error = None
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self._readingCache[index] = self._readings
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except Exception as e:
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self._readings = []
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self._error = DrtVariableExpression(Variable('Error: ' + str(e)))
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self._readingCache[index] = self._error
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#add a star to the end of the example
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self._exampleList.delete(index)
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self._exampleList.insert(index, (' %s *' % example))
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self._exampleList.config(height=min(len(self._examples), 25), width=40)
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self._populate_readingListbox()
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self._exampleList.selection_set(index)
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self._drs = None
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self._redraw()
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def _readingList_select(self, event):
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selection = self._readingList.curselection()
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if len(selection) != 1: return
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self._readingList_store_selection(int(selection[0]))
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def _readingList_store_selection(self, index):
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reading = self._readings[index]
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self._readingList.selection_clear(0, 'end')
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if reading:
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self._readingList.selection_set(index)
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self._drs = reading.simplify().normalize().resolve_anaphora()
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self._redraw()
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class DrsWidget(object):
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def __init__(self, canvas, drs, **attribs):
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self._drs = drs
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self._canvas = canvas
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canvas.font = Font(font=canvas.itemcget(canvas.create_text(0, 0, text=''), 'font'))
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canvas._BUFFER = 3
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self.bbox = (0, 0, 0, 0)
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def draw(self):
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(right, bottom) = DrsDrawer(self._drs, canvas=self._canvas).draw()
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self.bbox = (0, 0, right+1, bottom+1)
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def clear(self):
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self._canvas.create_rectangle(self.bbox, fill="white", width="0" )
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def demo():
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examples = ['John walks',
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'David sees Mary',
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'David eats a sandwich',
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'every man chases a dog',
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# 'every man believes a dog yawns',
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# 'John gives David a sandwich',
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'John chases himself',
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# 'John persuades David to order a pizza',
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# 'John tries to go',
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# 'John tries to find a unicorn',
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# 'John seems to vanish',
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# 'a unicorn seems to approach',
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# 'every big cat leaves',
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# 'every gray cat leaves',
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# 'every big gray cat leaves',
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# 'a former senator leaves',
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# 'John likes a cat',
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# 'John likes every cat',
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# 'he walks',
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# 'John walks and he leaves'
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]
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DrtGlueDemo(examples).mainloop()
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if __name__ == '__main__': demo()
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