| """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 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() |