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"""Basic regular expression demostration facility (Perl style syntax).
This displays a window with two type-in boxes. In the top box, you
enter a Perl style regular expression. In the bottom box, you enter a
string. The first match in the string of the regular expression is
highlighted with a yellow background (or red if the match is empty --
then the character at the match is highlighted). The highlighting is
continuously updated. At the bottom are a number of checkboxes which
control the regular expression options used (see the re module for
descriptions). When there's no match, or when the regular expression
is syntactically incorrect, an error message is displayed.
"""
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.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',
'LOCALE',
'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)
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()
flags = flags
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, 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: %s" % (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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