Checked in some new Tk demos that I wrote a while ago.
diff --git a/Demo/tkinter/guido/regexdemo.py b/Demo/tkinter/guido/regexdemo.py
new file mode 100644
index 0000000..89c9ee5
--- /dev/null
+++ b/Demo/tkinter/guido/regexdemo.py
@@ -0,0 +1,127 @@
+"""Basic regular expression demostration facility.
+
+This displays a window with two type-in boxes. In the top box, you enter a
+regular expression. In the bottom box, you enter a string. The first
+match in the string of the regular expression is highlighted with a yellow
+background (or red if the match is empty -- then the character at the match
+is highlighted). The highlighting is continuously updated. At the bottom
+are a number of checkboxes which control the regular expression syntax used
+(see the regex_syntax module for descriptions). When there's no match, or
+when the regular expression is syntactically incorrect, an error message is
+displayed.
+
+"""
+
+from Tkinter import *
+import regex
+import regex_syntax
+
+class RegexDemo:
+
+ def __init__(self, master):
+ self.master = master
+ self.topframe = Frame(self.master)
+ self.topframe.pack(fill=X)
+ self.promptdisplay = Label(self.topframe, text="Enter a string:")
+ self.promptdisplay.pack(side=LEFT)
+ self.statusdisplay = Label(self.topframe, text="", anchor=W)
+ self.statusdisplay.pack(side=LEFT, fill=X)
+ self.regexdisplay = Entry(self.master)
+ self.regexdisplay.pack(fill=X)
+ self.regexdisplay.focus_set()
+ self.labeldisplay = Label(self.master, anchor=W,
+ text="Enter a string:")
+ self.labeldisplay.pack(fill=X)
+ self.labeldisplay.pack(fill=X)
+ self.stringdisplay = Text(self.master, width=60, height=4)
+ self.stringdisplay.pack(fill=BOTH, expand=1)
+ self.stringdisplay.tag_configure("hit", background="yellow")
+ self.addoptions()
+ 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 ( 'RE_NO_BK_PARENS',
+ 'RE_NO_BK_VBAR',
+ 'RE_BK_PLUS_QM',
+ 'RE_TIGHT_VBAR',
+ 'RE_NEWLINE_OR',
+ 'RE_CONTEXT_INDEP_OPS'):
+ if len(self.boxes) % 3 == 0:
+ frame = Frame(self.master)
+ frame.pack(fill=X)
+ self.frames.append(frame)
+ val = getattr(regex_syntax, name)
+ var = IntVar()
+ box = Checkbutton(frame,
+ variable=var, text=name,
+ offvalue=0, onvalue=val,
+ command=self.newsyntax)
+ box.pack(side=LEFT)
+ self.boxes.append(box)
+ self.vars.append(var)
+
+ def newsyntax(self):
+ syntax = 0
+ for var in self.vars:
+ syntax = syntax | var.get()
+ regex.set_syntax(syntax)
+ self.recompile()
+
+ def recompile(self, event=None):
+ try:
+ self.compiled = regex.compile(self.regexdisplay.get())
+ self.statusdisplay.config(text="")
+ except regex.error, msg:
+ self.compiled = None
+ self.statusdisplay.config(text="regex.error: %s" % str(msg))
+ self.reevaluate()
+
+ def reevaluate(self, event=None):
+ try:
+ self.stringdisplay.tag_remove("hit", "1.0", END)
+ except TclError:
+ pass
+ if not self.compiled:
+ return
+ text = self.stringdisplay.get("1.0", END)
+ i = self.compiled.search(text)
+ if i < 0:
+ self.statusdisplay.config(text="(no match)")
+ else:
+ self.statusdisplay.config(text="")
+ regs = self.compiled.regs
+ first, last = regs[0]
+ if last == first:
+ last = first+1
+ self.stringdisplay.tag_configure("hit",
+ background="red")
+ else:
+ self.stringdisplay.tag_configure("hit",
+ background="yellow")
+ pfirst = "1.0 + %d chars" % first
+ plast = "1.0 + %d chars" % last
+ self.stringdisplay.tag_add("hit", pfirst, plast)
+ self.stringdisplay.yview_pickplace(pfirst)
+
+
+
+# Main function, run when invoked as a stand-alone Python program.
+
+def main():
+ root = Tk()
+ demo = RegexDemo(root)
+ root.protocol('WM_DELETE_WINDOW', root.quit)
+ root.mainloop()
+
+if __name__ == '__main__':
+ main()