| """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() |