| | |
| |
|
| | """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.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="") |
| |
|
| |
|
| | |
| |
|
| | def main(): |
| | root = Tk() |
| | demo = ReDemo(root) |
| | root.protocol('WM_DELETE_WINDOW', root.quit) |
| | root.mainloop() |
| |
|
| | if __name__ == '__main__': |
| | main() |
| |
|
