Tools/scripts/redemo.py

   1 """Basic regular expression demostration facility (Perl style syntax)."""
   2
   3 from Tkinter import *
   4 import re
   5
   6 class ReDemo:
   7
   8     def __init__(self, master):
   9         self.master = master
  10
  11         self.promptdisplay = Label(self.master, anchor=W,
  12                 text="Enter a Perl-style regular expression:")
  13         self.promptdisplay.pack(side=TOP, fill=X)
  14
  15         self.regexdisplay = Entry(self.master)
  16         self.regexdisplay.pack(fill=X)
  17         self.regexdisplay.focus_set()
  18
  19         self.addoptions()
  20
  21         self.statusdisplay = Label(self.master, text="", anchor=W)
  22         self.statusdisplay.pack(side=TOP, fill=X)
  23
  24         self.labeldisplay = Label(self.master, anchor=W,
  25                 text="Enter a string to search:")
  26         self.labeldisplay.pack(fill=X)
  27         self.labeldisplay.pack(fill=X)
  28
  29         self.showframe = Frame(master)
  30         self.showframe.pack(fill=X, anchor=W)
  31
  32         self.showvar = StringVar(master)
  33         self.showvar.set("first")
  34
  35         self.showfirstradio = Radiobutton(self.showframe,
  36                                          text="Highlight first match",
  37                                           variable=self.showvar,
  38                                           value="first",
  39                                           command=self.recompile)
  40         self.showfirstradio.pack(side=LEFT)
  41
  42         self.showallradio = Radiobutton(self.showframe,
  43                                         text="Highlight all matches",
  44                                         variable=self.showvar,
  45                                         value="all",
  46                                         command=self.recompile)
  47         self.showallradio.pack(side=LEFT)
  48
  49         self.stringdisplay = Text(self.master, width=60, height=4)
  50         self.stringdisplay.pack(fill=BOTH, expand=1)
  51         self.stringdisplay.tag_configure("hit", background="yellow")
  52
  53         self.grouplabel = Label(self.master, text="Groups:", anchor=W)
  54         self.grouplabel.pack(fill=X)
  55
  56         self.grouplist = Listbox(self.master)
  57         self.grouplist.pack(expand=1, fill=BOTH)
  58
  59         self.regexdisplay.bind('<Key>', self.recompile)
  60         self.stringdisplay.bind('<Key>', self.reevaluate)
  61
  62         self.compiled = None
  63         self.recompile()
  64
  65         btags = self.regexdisplay.bindtags()
  66         self.regexdisplay.bindtags(btags[1:] + btags[:1])
  67
  68         btags = self.stringdisplay.bindtags()
  69         self.stringdisplay.bindtags(btags[1:] + btags[:1])
  70
  71     def addoptions(self):
  72         self.frames = []
  73         self.boxes = []
  74         self.vars = []
  75         for name in ('IGNORECASE',
  76                      'LOCALE',
  77                      'MULTILINE',
  78                      'DOTALL',
  79                      'VERBOSE'):
  80             if len(self.boxes) % 3 == 0:
  81                 frame = Frame(self.master)
  82                 frame.pack(fill=X)
  83                 self.frames.append(frame)
  84             val = getattr(re, name)
  85             var = IntVar()
  86             box = Checkbutton(frame,
  87                     variable=var, text=name,
  88                     offvalue=0, onvalue=val,
  89                     command=self.recompile)
  90             box.pack(side=LEFT)
  91             self.boxes.append(box)
  92             self.vars.append(var)
  93
  94     def getflags(self):
  95         flags = 0
  96         for var in self.vars:
  97             flags = flags | var.get()
  98         flags = flags
  99         return flags
 100
 101     def recompile(self, event=None):
 102         try:
 103             self.compiled = re.compile(self.regexdisplay.get(),
 104                                        self.getflags())
 105             bg = self.promptdisplay['background']
 106             self.statusdisplay.config(text="", background=bg)
 107         except re.error, msg:
 108             self.compiled = None
 109             self.statusdisplay.config(
 110                     text="re.error: %s" % str(msg),
 111                     background="red")
 112         self.reevaluate()
 113
 114     def reevaluate(self, event=None):
 115         try:
 116             self.stringdisplay.tag_remove("hit", "1.0", END)
 117         except TclError:
 118             pass
 119         try:
 120             self.stringdisplay.tag_remove("hit0", "1.0", END)
 121         except TclError:
 122             pass
 123         self.grouplist.delete(0, END)
 124         if not self.compiled:
 125             return
 126         self.stringdisplay.tag_configure("hit", background="yellow")
 127         self.stringdisplay.tag_configure("hit0", background="orange")
 128         text = self.stringdisplay.get("1.0", END)
 129         last = 0
 130         nmatches = 0
 131         while last <= len(text):
 132             m = self.compiled.search(text, last)
 133             if m is None:
 134                 break
 135             first, last = m.span()
 136             if last == first:
 137                 last = first+1
 138                 tag = "hit0"
 139             else:
 140                 tag = "hit"
 141             pfirst = "1.0 + %d chars" % first
 142             plast = "1.0 + %d chars" % last
 143             self.stringdisplay.tag_add(tag, pfirst, plast)
 144             if nmatches == 0:
 145                 self.stringdisplay.yview_pickplace(pfirst)
 146                 groups = list(m.groups())
 147                 groups.insert(0, m.group())
 148                 for i in range(len(groups)):
 149                     g = "%2d: %r" % (i, groups[i])
 150                     self.grouplist.insert(END, g)
 151             nmatches = nmatches + 1
 152             if self.showvar.get() == "first":
 153                 break
 154
 155         if nmatches == 0:
 156             self.statusdisplay.config(text="(no match)",
 157                                       background="yellow")
 158         else:
 159             self.statusdisplay.config(text="")
 160
 161
 162 # Main function, run when invoked as a stand-alone Python program.
 163
 164 def main():
 165     root = Tk()
 166     demo = ReDemo(root)
 167     root.protocol('WM_DELETE_WINDOW', root.quit)
 168     root.mainloop()
 169
 170 if __name__ == '__main__':
 171     main()