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#!/usr/bin/env python3

"""Basic regular expression demonstration facility (Perl style syntax)."""

from tkinter import *

import re

class ReDemo:

def __init__(self, master):

self.master = master

self.promptdisplay = Label(self.master, anchor=W,

text="Enter a Perl-style regular expression:")

self.promptdisplay.pack(side=TOP, fill=X)

self.regexdisplay = Entry(self.master)

self.regexdisplay.pack(fill=X)

self.regexdisplay.focus_set()

self.addoptions()

self.statusdisplay = Label(self.master, text="", anchor=W)

self.statusdisplay.pack(side=TOP, fill=X)

self.labeldisplay = Label(self.master, anchor=W,

text="Enter a string to search:")

self.labeldisplay.pack(fill=X)

self.showframe = Frame(master)

self.showframe.pack(fill=X, anchor=W)

self.showvar = StringVar(master)

self.showvar.set("first")

self.showfirstradio = Radiobutton(self.showframe,

text="Highlight first match",

variable=self.showvar,

value="first",

command=self.recompile)

self.showfirstradio.pack(side=LEFT)

self.showallradio = Radiobutton(self.showframe,

text="Highlight all matches",

variable=self.showvar,

value="all",

command=self.recompile)

self.showallradio.pack(side=LEFT)

self.stringdisplay = Text(self.master, width=60, height=4)

self.stringdisplay.pack(fill=BOTH, expand=1)

self.stringdisplay.tag_configure("hit", background="yellow")

self.grouplabel = Label(self.master, text="Groups:", anchor=W)

self.grouplabel.pack(fill=X)

self.grouplist = Listbox(self.master)

self.grouplist.pack(expand=1, fill=BOTH)

self.regexdisplay.bind('<Key>', self.recompile)

self.stringdisplay.bind('<Key>', self.reevaluate)

self.compiled = None

self.recompile()

btags = self.regexdisplay.bindtags()

self.regexdisplay.bindtags(btags[1:] + btags[:1])

btags = self.stringdisplay.bindtags()

self.stringdisplay.bindtags(btags[1:] + btags[:1])

def addoptions(self):

self.frames = []

self.boxes = []

self.vars = []

for name in ('IGNORECASE',

'MULTILINE',

'DOTALL',

'VERBOSE'):

if len(self.boxes) % 3 == 0:

frame = Frame(self.master)

frame.pack(fill=X)

self.frames.append(frame)

val = getattr(re, name).value

var = IntVar()

box = Checkbutton(frame,

variable=var, text=name,

offvalue=0, onvalue=val,

command=self.recompile)

box.pack(side=LEFT)

self.boxes.append(box)

self.vars.append(var)

def getflags(self):

flags = 0

for var in self.vars:

flags = flags | var.get()

return flags

def recompile(self, event=None):

try:

self.compiled = re.compile(self.regexdisplay.get(),

self.getflags())

bg = self.promptdisplay['background']

self.statusdisplay.config(text="", background=bg)

except re.error as msg:

self.compiled = None

self.statusdisplay.config(

text="re.error: %s" % str(msg),

background="red")

self.reevaluate()

def reevaluate(self, event=None):

try:

self.stringdisplay.tag_remove("hit", "1.0", END)

except TclError:

pass

try:

self.stringdisplay.tag_remove("hit0", "1.0", END)

except TclError:

pass

self.grouplist.delete(0, END)

if not self.compiled:

return

self.stringdisplay.tag_configure("hit", background="yellow")

self.stringdisplay.tag_configure("hit0", background="orange")

text = self.stringdisplay.get("1.0", END)

last = 0

nmatches = 0

while last <= len(text):

m = self.compiled.search(text, last)

if m is None:

break

first, last = m.span()

if last == first:

last = first+1

tag = "hit0"

else:

tag = "hit"

pfirst = "1.0 + %d chars" % first

plast = "1.0 + %d chars" % last

self.stringdisplay.tag_add(tag, pfirst, plast)

if nmatches == 0:

self.stringdisplay.yview_pickplace(pfirst)

groups = list(m.groups())

groups.insert(0, m.group())

for i in range(len(groups)):

g = "%2d: %r" % (i, groups[i])

self.grouplist.insert(END, g)

nmatches = nmatches + 1

if self.showvar.get() == "first":

break

if nmatches == 0:

self.statusdisplay.config(text="(no match)",

background="yellow")

else:

self.statusdisplay.config(text="")

# Main function, run when invoked as a stand-alone Python program.

def main():

root = Tk()

demo = ReDemo(root)

root.protocol('WM_DELETE_WINDOW', root.quit)

root.mainloop()

if __name__ == '__main__':

main()

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