Staging
v0.8.1
v0.8.1
https://github.com/python/cpython
Tip revision: 74f4bd53e03ded8408bcc2de67cf0f5a4ac5b1a1 authored by Barry Warsaw on 23 February 2012, 15:59:38 UTC
Bump some more copyright years (as per PEP 101), since this is the first
Bump some more copyright years (as per PEP 101), since this is the first
Tip revision: 74f4bd5
redemo.py
"""Basic regular expression demostration 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.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: %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()