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pdaSim.py
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pdaSim.py
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import tkinter as tk
from tkinter import scrolledtext, Label, Frame
import re
from automata.pda.npda import NPDA
from automata.pda.stack import PDAStack
from automata.pda.configuration import PDAConfiguration
from automata.base.exceptions import RejectionException
def norm(txt):
return re.sub("[^\S\r\n]", "", txt)
def removeNLs(txt):
return re.sub("[\r\n]", "", txt)
class AsciiTree:
BLTCORNER = "┌"
BRTCORNER = "┐"
BLBCORNER = "└"
BRBCORNER = "┘"
BHEDGE = "─"
BVEDGE = "│"
BTCONNECTOR = "┴"
BBCONNECTOR = "┬"
VEDGE = "│"
HEDGE = "─"
SCEDGE = "├"
SEDGE = "└"
EEDGE = "┐"
CEDGE = "┬"
def __init__(self, boxSize):
self.content = ""
self.boxSize = boxSize
self.boxParts = (self.boxSize[1] >> 1, self.boxSize[1] - 1 - (self.boxSize[1] >> 1))
self.boxTop = AsciiTree.BLTCORNER + self.boxParts[0] * AsciiTree.BHEDGE + AsciiTree.BTCONNECTOR + self.boxParts[1] * AsciiTree.BHEDGE + AsciiTree.BRTCORNER
self.boxBottom = AsciiTree.BLBCORNER + self.boxParts[0] * AsciiTree.BHEDGE + AsciiTree.BBCONNECTOR + self.boxParts[1] * AsciiTree.BHEDGE + AsciiTree.BRBCORNER
self.boxWidth = len(self.boxTop)
self.lastLevel = ((0, 0), )
return
def createEdges(self, edgeGroups):
content = ""
if len(edgeGroups) == 0:
return content
lines = []
for i, (pcol, toCols)in enumerate(edgeGroups):
edgeLength = (toCols[-1] - pcol) * self.boxWidth
edge = ""
toColsCheck = set(((toCol - pcol) * self.boxWidth for toCol in toCols))
if edgeLength == 0:
edge = AsciiTree.VEDGE
else:
edge = "".join((AsciiTree.CEDGE if ichar in toColsCheck else char for ichar, char in enumerate(edgeLength * AsciiTree.HEDGE)))
edge = (AsciiTree.SCEDGE if pcol == toCols[0] else AsciiTree.SEDGE) + edge[1:] + AsciiTree.EEDGE
prefix = (pcol * self.boxWidth + self.boxParts[0] + 1) * " "
line = prefix + edge
lines.append(line)
#norm
maxLength = max((len(line) for line in lines))
lines = [line + (maxLength - len(line)) * " " for line in lines]
#scan from bottom to top
for i in range(1, len(lines)):
prevLine = lines[i-1]
line = lines[i]
toFinish = set([AsciiTree.SCEDGE, AsciiTree.SEDGE, AsciiTree.VEDGE])
lines[i] = "".join([AsciiTree.VEDGE if char == " " and prevLine[ichar] in toFinish else char for ichar, char in enumerate(line)])
lines.reverse()
#scan again from top to bottom
for i in range(1, len(lines)):
prevLine = lines[i-1]
line = lines[i]
toFinish = set([AsciiTree.SCEDGE, AsciiTree.EEDGE, AsciiTree.VEDGE, AsciiTree.CEDGE])
lines[i] = "".join([AsciiTree.VEDGE if char == " " and prevLine[ichar] in toFinish else char for ichar, char in enumerate(line)])
return "\n".join(lines)
def addLevel(self, items):
topLine = ""
midLines = [""] * self.boxSize[0]
bottomLine = ""
nextCol = 0
level = []
edgeGroups = []
for parent, pcol in self.lastLevel:
toCols = []
if parent not in items:
continue
for i, (child, data) in enumerate(items[parent]):
col = max(pcol + i, nextCol)
level.append((child, col))
toCols.append(col)
df = col - nextCol
nextCol = col + 1
topLine += " " * df * self.boxWidth + self.boxTop
for j in range(self.boxSize[0]):
lineData = data[j][:self.boxSize[1]]
lineData = lineData + (self.boxSize[1] - len(lineData)) * " "
midLines[j] += " " * df * self.boxWidth + AsciiTree.BVEDGE + lineData + AsciiTree.BVEDGE
bottomLine += " " * df * self.boxWidth + self.boxBottom
if len(toCols) > 0:
edgeGroups.append((pcol, toCols))
content = self.createEdges(edgeGroups) + "\n" + topLine + "\n" + "\n".join(midLines) + "\n" + bottomLine + "\n"
self.content += content
self.lastLevel = tuple(level)
return content
class MyNPDA(NPDA):
def read_input_stepwise(self, input_str):
"""
Check if the given string is accepted by this NPDA.
Yield the NPDA's current configurations at each step.
"""
current_configurations = set()
initial_configuration = PDAConfiguration(
self.initial_state,
input_str,
PDAStack([self.initial_stack_symbol])
)
initial_configuration.cid = 0
initial_configuration.pcid = 0
current_configurations.add(initial_configuration)
yield current_configurations
cid = 1
while current_configurations:
new_configurations = set()
for config in current_configurations:
if self._has_accepted(config):
# One accepting configuration is enough.
return
next_configurations = set()
if config.remaining_input or self._has_lambda_transition(config.state, config.stack.top()):
next_configurations = self._get_next_configurations(config)
for next_conf in next_configurations:
next_conf.cid = cid
cid += 1
next_conf.pcid = config.cid
new_configurations.update(
next_configurations
)
current_configurations = new_configurations
yield current_configurations
raise RejectionException(
'the NPDA did not reach an accepting configuration'
)
class Automaton:
def __init__(self, parser):
self.parser = parser
self.npda = None
self.steps = None
self.asciiTree = AsciiTree((3,20))
self.canStep = True
return
def stop(self, text_area_C=None):
self.npda = None
self.steps = None
if text_area_C is not None:
text_area_C.delete('1.0', 'end')
self.canStep = True
self.asciiTree = AsciiTree((3,20))
return
def initialize(self, txtAreaT, txtAreaF, txtAreaI):
txtTrans = txtAreaT.get("1.0", "end")
txtF = txtAreaF.get("1.0", "end")
txtI = txtAreaI.get("1.0", "end")
definition = self.parser.parse(txtTrans, txtF)
print(definition)
self.npda = MyNPDA(**definition)
self.steps = self.npda.read_input_stepwise(removeNLs(txtI))
return
def step(self, txtAreaT, txtAreaF, txtAreaI, text_area_C):
if(self.canStep == False):
return
if self.steps is None:
self.initialize(txtAreaT, txtAreaF, txtAreaI)
try:
confs = next(self.steps)
items = {}
for conf in confs:
if conf.pcid not in items:
items[conf.pcid] = []
items[conf.pcid].append((conf.cid, ("S:" + conf.state, "V:" + conf.remaining_input, "Z:" + "".join(conf.stack))))
if len(items) > 0:
treePart = self.asciiTree.addLevel(items)
#text_area_C.delete('1.0', 'end')
text_area_C.insert(tk.END, treePart)
print(confs)
except StopIteration:
print("ACCEPTED!!!")
text_area_C.insert(tk.END, ("\n" + "─"*11 + "\n"*2) + "ACCEPTED!!!")
self.canStep = False
except RejectionException:
print("REJECTED!!!")
text_area_C.insert(tk.END, ("\n" + "─"*11 + "\n"*2) + "REJECTED!!!")
self.canStep = False
text_area_C.see(tk.END)
return
class Parser:
def __init__(self):
return
def parse(self, txtTrans, txtF):
transitions = {}
states = set()
inputSymbols = set()
stackSymbols = set()
normedTrans = norm(txtTrans)
matches = re.finditer("d\(([a-z]\d*),(.?),([A-Z]\d*)\)=\(([a-z]\d*),(([A-Z]\d*)*)\)", normedTrans)
for match in matches:
state = match.group(1)
inputSymbol = match.group(2)
stackTop = match.group(3)
newState = match.group(4)
pushToStack = tuple(re.findall("[A-Z]\d*", match.group(5)))
states.add(state)
inputSymbols.add(inputSymbol)
stackSymbols.add(stackTop)
stackSymbols.update(pushToStack)
if state not in transitions:
transitions[state] = {}
if inputSymbol not in transitions[state]:
transitions[state][inputSymbol] = {}
if stackTop not in transitions[state][inputSymbol]:
transitions[state][inputSymbol][stackTop] = set()
transitions[state][inputSymbol][stackTop].add((newState, pushToStack))
inputSymbols.discard('')
stackSymbols.add('Z0')
states.add('q0')
normedF = norm(txtF)
match = re.match("\{(([a-z]\d*)(,[a-z]\d*)*)\}", normedF)
finalStates = set(match.group(1).split(',')) if match is not None else set()
states.add('q0')
states.update(finalStates)
definition = {
'states':states,
'input_symbols':inputSymbols,
'stack_symbols':stackSymbols,
'transitions':transitions,
'initial_state':'q0',
'initial_stack_symbol':'Z0',
'final_states':finalStates,
'acceptance_mode':'final_state'
}
return definition
if __name__=="__main__":
"""
asciiTree = AsciiTree((3,20))
asciiTree.addLevel({0:((0,("S:q0","V:a","Z:A")),)})
asciiTree.addLevel({0:((1, ("S:q0","V:a","Z:A")),(2, ("S:q0","V:a","Z:A")),(3, ("S:q0","V:a","Z:A")))})
print(asciiTree.content)
import sys
sys.exit(0)
"""
# Creating tkinter main window
win = tk.Tk()
win.title("PDA Sim")
parser = Parser()
automaton = Automaton(parser)
font = ("Consolas", 12)
label = Label(text = "Definícia", anchor="w", font=font)
label.grid(row=0, column=0, sticky="w", padx=10, pady=(10,0))
text_area = scrolledtext.ScrolledText(
win,
wrap = tk.WORD,
width = 40,
height = 9,
font = font
)
text_area.grid(row = 1, column = 0, padx = 10)
text_area.insert(tk.INSERT, "\n".join((
"M = (K, S, T, d, q0, Z0, F)\n",
"K je konečná množina stavov",
"S je vstupná abeceda",
"T je zásobníková abeceda",
"d je prechodová funkcia",
"q0 je počiatočný stav",
"Z0 je počiatočný zásobníkový symbol",
"F je množina koncových stavov"
)))
text_area.config(state=tk.DISABLED)
label = Label(text = "F", anchor="w", font=font)
label.grid(row=2, column=0, sticky="w", padx=10, pady=(10,0))
text_area_F = scrolledtext.ScrolledText(
win,
wrap = tk.WORD,
width = 40,
height = 1,
font = font
)
text_area_F.grid(row = 3, column = 0, padx = 10)
text_area_F.insert(tk.INSERT, "{f1, f2}")
label = Label(text = "Prechodové funkcie", anchor="w", font=font)
label.grid(row=4, column=0, sticky="w", padx=10, pady=(10,0))
text_area_T = scrolledtext.ScrolledText(
win,
wrap = tk.WORD,
width = 40,
height = 10,
font = font
)
text_area_T.grid(row = 5, column = 0, pady = (0,10), padx = 10)
label = Label(text = "Priebeh", anchor="w", font=font)
label.grid(row=0, column=1, sticky="w", padx=10, pady=(10,0))
cframe = Frame(win)
vbar = tk.Scrollbar(cframe)
vbar.pack (side = tk.RIGHT, fill = "y")
hbar = tk.Scrollbar(cframe, orient = tk.HORIZONTAL)
hbar.pack (side = tk.BOTTOM, fill = "x")
text_area_C = tk.Text(
cframe,
width = 110,
yscrollcommand = vbar.set,
xscrollcommand = hbar.set,
wrap = "none",
font = ("Consolas", 8)
)
text_area_C.pack(expand = 1, fill = tk.BOTH)
hbar.config(command = text_area_C.xview)
vbar.config(command = text_area_C.yview)
cframe.grid(row = 1, column = 1, rowspan=7, pady = (0,10), padx = 10, sticky="ns")
label = Label(text = "Vstup", anchor="w", font=font)
label.grid(row=6, column=0, sticky="w", padx=10)
text_area_I = scrolledtext.ScrolledText(
win,
wrap = tk.WORD,
height = 2,
width = 40,
font = font
)
text_area_I.grid(row = 7, column = 0, pady = (0,10), padx = 10)
bframe = Frame(win)
bframe.grid(row=8, column=0, columnspan=2, sticky="nsew")
button1=tk.Button(bframe, text="Stop", command=lambda: automaton.stop(text_area_C))
button1.grid(row = 0, column = 0, pady = (0,10), padx = (10,0))
button1=tk.Button(bframe, text="Krok", command=lambda: automaton.step(text_area_T, text_area_F, text_area_I, text_area_C))
button1.grid(row = 0, column = 1, pady = (0,10))
# Placing cursor in the text area
text_area_T.focus()
win.resizable(False, False)
win.mainloop()