172 lines
4.4 KiB
Python
172 lines
4.4 KiB
Python
"""Basic regular expression demostration facility (Perl style syntax)."""
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from Tkinter import *
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import re
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class ReDemo:
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def __init__(self, master):
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self.master = master
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self.promptdisplay = Label(self.master, anchor=W,
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text="Enter a Perl-style regular expression:")
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self.promptdisplay.pack(side=TOP, fill=X)
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self.regexdisplay = Entry(self.master)
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self.regexdisplay.pack(fill=X)
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self.regexdisplay.focus_set()
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self.addoptions()
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self.statusdisplay = Label(self.master, text="", anchor=W)
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self.statusdisplay.pack(side=TOP, fill=X)
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self.labeldisplay = Label(self.master, anchor=W,
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text="Enter a string to search:")
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self.labeldisplay.pack(fill=X)
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self.labeldisplay.pack(fill=X)
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self.showframe = Frame(master)
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self.showframe.pack(fill=X, anchor=W)
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self.showvar = StringVar(master)
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self.showvar.set("first")
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self.showfirstradio = Radiobutton(self.showframe,
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text="Highlight first match",
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variable=self.showvar,
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value="first",
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command=self.recompile)
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self.showfirstradio.pack(side=LEFT)
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self.showallradio = Radiobutton(self.showframe,
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text="Highlight all matches",
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variable=self.showvar,
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value="all",
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command=self.recompile)
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self.showallradio.pack(side=LEFT)
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self.stringdisplay = Text(self.master, width=60, height=4)
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self.stringdisplay.pack(fill=BOTH, expand=1)
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self.stringdisplay.tag_configure("hit", background="yellow")
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self.grouplabel = Label(self.master, text="Groups:", anchor=W)
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self.grouplabel.pack(fill=X)
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self.grouplist = Listbox(self.master)
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self.grouplist.pack(expand=1, fill=BOTH)
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self.regexdisplay.bind('<Key>', self.recompile)
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self.stringdisplay.bind('<Key>', self.reevaluate)
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self.compiled = None
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self.recompile()
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btags = self.regexdisplay.bindtags()
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self.regexdisplay.bindtags(btags[1:] + btags[:1])
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btags = self.stringdisplay.bindtags()
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self.stringdisplay.bindtags(btags[1:] + btags[:1])
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def addoptions(self):
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self.frames = []
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self.boxes = []
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self.vars = []
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for name in ('IGNORECASE',
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'LOCALE',
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'MULTILINE',
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'DOTALL',
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'VERBOSE'):
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if len(self.boxes) % 3 == 0:
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frame = Frame(self.master)
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frame.pack(fill=X)
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self.frames.append(frame)
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val = getattr(re, name)
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var = IntVar()
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box = Checkbutton(frame,
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variable=var, text=name,
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offvalue=0, onvalue=val,
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command=self.recompile)
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box.pack(side=LEFT)
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self.boxes.append(box)
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self.vars.append(var)
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def getflags(self):
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flags = 0
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for var in self.vars:
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flags = flags | var.get()
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flags = flags
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return flags
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def recompile(self, event=None):
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try:
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self.compiled = re.compile(self.regexdisplay.get(),
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self.getflags())
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bg = self.promptdisplay['background']
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self.statusdisplay.config(text="", background=bg)
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except re.error, msg:
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self.compiled = None
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self.statusdisplay.config(
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text="re.error: %s" % str(msg),
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background="red")
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self.reevaluate()
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def reevaluate(self, event=None):
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try:
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self.stringdisplay.tag_remove("hit", "1.0", END)
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except TclError:
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pass
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try:
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self.stringdisplay.tag_remove("hit0", "1.0", END)
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except TclError:
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pass
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self.grouplist.delete(0, END)
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if not self.compiled:
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return
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self.stringdisplay.tag_configure("hit", background="yellow")
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self.stringdisplay.tag_configure("hit0", background="orange")
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text = self.stringdisplay.get("1.0", END)
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last = 0
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nmatches = 0
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while last <= len(text):
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m = self.compiled.search(text, last)
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if m is None:
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break
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first, last = m.span()
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if last == first:
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last = first+1
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tag = "hit0"
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else:
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tag = "hit"
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pfirst = "1.0 + %d chars" % first
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plast = "1.0 + %d chars" % last
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self.stringdisplay.tag_add(tag, pfirst, plast)
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if nmatches == 0:
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self.stringdisplay.yview_pickplace(pfirst)
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groups = list(m.groups())
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groups.insert(0, m.group())
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for i in range(len(groups)):
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g = "%2d: %s" % (i, `groups[i]`)
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self.grouplist.insert(END, g)
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nmatches = nmatches + 1
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if self.showvar.get() == "first":
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break
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if nmatches == 0:
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self.statusdisplay.config(text="(no match)",
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background="yellow")
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else:
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self.statusdisplay.config(text="")
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# Main function, run when invoked as a stand-alone Python program.
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def main():
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root = Tk()
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demo = ReDemo(root)
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root.protocol('WM_DELETE_WINDOW', root.quit)
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root.mainloop()
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if __name__ == '__main__':
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main()
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