| 1 | #!/usr/bin/env python
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| 2 | """Basic regular expression demostration facility (Perl style syntax)."""
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| 3 |
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| 4 | from Tkinter import *
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| 5 | import re
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| 6 |
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| 7 | class ReDemo:
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| 8 |
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| 9 | def __init__(self, master):
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| 10 | self.master = master
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| 11 |
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| 12 | self.promptdisplay = Label(self.master, anchor=W,
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| 13 | text="Enter a Perl-style regular expression:")
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| 14 | self.promptdisplay.pack(side=TOP, fill=X)
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| 15 |
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| 16 | self.regexdisplay = Entry(self.master)
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| 17 | self.regexdisplay.pack(fill=X)
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| 18 | self.regexdisplay.focus_set()
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| 19 |
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| 20 | self.addoptions()
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| 21 |
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| 22 | self.statusdisplay = Label(self.master, text="", anchor=W)
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| 23 | self.statusdisplay.pack(side=TOP, fill=X)
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| 24 |
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| 25 | self.labeldisplay = Label(self.master, anchor=W,
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| 26 | text="Enter a string to search:")
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| 27 | self.labeldisplay.pack(fill=X)
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| 28 | self.labeldisplay.pack(fill=X)
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| 29 |
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| 30 | self.showframe = Frame(master)
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| 31 | self.showframe.pack(fill=X, anchor=W)
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| 32 |
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| 33 | self.showvar = StringVar(master)
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| 34 | self.showvar.set("first")
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| 35 |
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| 36 | self.showfirstradio = Radiobutton(self.showframe,
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| 37 | text="Highlight first match",
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| 38 | variable=self.showvar,
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| 39 | value="first",
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| 40 | command=self.recompile)
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| 41 | self.showfirstradio.pack(side=LEFT)
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| 42 |
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| 43 | self.showallradio = Radiobutton(self.showframe,
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| 44 | text="Highlight all matches",
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| 45 | variable=self.showvar,
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| 46 | value="all",
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| 47 | command=self.recompile)
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| 48 | self.showallradio.pack(side=LEFT)
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| 49 |
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| 50 | self.stringdisplay = Text(self.master, width=60, height=4)
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| 51 | self.stringdisplay.pack(fill=BOTH, expand=1)
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| 52 | self.stringdisplay.tag_configure("hit", background="yellow")
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| 53 |
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| 54 | self.grouplabel = Label(self.master, text="Groups:", anchor=W)
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| 55 | self.grouplabel.pack(fill=X)
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| 56 |
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| 57 | self.grouplist = Listbox(self.master)
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| 58 | self.grouplist.pack(expand=1, fill=BOTH)
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| 59 |
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| 60 | self.regexdisplay.bind('<Key>', self.recompile)
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| 61 | self.stringdisplay.bind('<Key>', self.reevaluate)
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| 62 |
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| 63 | self.compiled = None
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| 64 | self.recompile()
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| 65 |
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| 66 | btags = self.regexdisplay.bindtags()
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| 67 | self.regexdisplay.bindtags(btags[1:] + btags[:1])
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| 68 |
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| 69 | btags = self.stringdisplay.bindtags()
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| 70 | self.stringdisplay.bindtags(btags[1:] + btags[:1])
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| 71 |
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| 72 | def addoptions(self):
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| 73 | self.frames = []
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| 74 | self.boxes = []
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| 75 | self.vars = []
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| 76 | for name in ('IGNORECASE',
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| 77 | 'LOCALE',
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| 78 | 'MULTILINE',
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| 79 | 'DOTALL',
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| 80 | 'VERBOSE'):
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| 81 | if len(self.boxes) % 3 == 0:
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| 82 | frame = Frame(self.master)
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| 83 | frame.pack(fill=X)
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| 84 | self.frames.append(frame)
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| 85 | val = getattr(re, name)
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| 86 | var = IntVar()
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| 87 | box = Checkbutton(frame,
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| 88 | variable=var, text=name,
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| 89 | offvalue=0, onvalue=val,
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| 90 | command=self.recompile)
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| 91 | box.pack(side=LEFT)
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| 92 | self.boxes.append(box)
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| 93 | self.vars.append(var)
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| 94 |
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| 95 | def getflags(self):
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| 96 | flags = 0
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| 97 | for var in self.vars:
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| 98 | flags = flags | var.get()
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| 99 | flags = flags
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| 100 | return flags
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| 101 |
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| 102 | def recompile(self, event=None):
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| 103 | try:
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| 104 | self.compiled = re.compile(self.regexdisplay.get(),
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| 105 | self.getflags())
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| 106 | bg = self.promptdisplay['background']
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| 107 | self.statusdisplay.config(text="", background=bg)
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| 108 | except re.error, msg:
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| 109 | self.compiled = None
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| 110 | self.statusdisplay.config(
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| 111 | text="re.error: %s" % str(msg),
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| 112 | background="red")
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| 113 | self.reevaluate()
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| 114 |
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| 115 | def reevaluate(self, event=None):
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| 116 | try:
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| 117 | self.stringdisplay.tag_remove("hit", "1.0", END)
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| 118 | except TclError:
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| 119 | pass
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| 120 | try:
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| 121 | self.stringdisplay.tag_remove("hit0", "1.0", END)
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| 122 | except TclError:
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| 123 | pass
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| 124 | self.grouplist.delete(0, END)
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| 125 | if not self.compiled:
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| 126 | return
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| 127 | self.stringdisplay.tag_configure("hit", background="yellow")
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| 128 | self.stringdisplay.tag_configure("hit0", background="orange")
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| 129 | text = self.stringdisplay.get("1.0", END)
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| 130 | last = 0
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| 131 | nmatches = 0
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| 132 | while last <= len(text):
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| 133 | m = self.compiled.search(text, last)
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| 134 | if m is None:
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| 135 | break
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| 136 | first, last = m.span()
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| 137 | if last == first:
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| 138 | last = first+1
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| 139 | tag = "hit0"
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| 140 | else:
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| 141 | tag = "hit"
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| 142 | pfirst = "1.0 + %d chars" % first
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| 143 | plast = "1.0 + %d chars" % last
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| 144 | self.stringdisplay.tag_add(tag, pfirst, plast)
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| 145 | if nmatches == 0:
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| 146 | self.stringdisplay.yview_pickplace(pfirst)
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| 147 | groups = list(m.groups())
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| 148 | groups.insert(0, m.group())
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| 149 | for i in range(len(groups)):
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| 150 | g = "%2d: %r" % (i, groups[i])
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| 151 | self.grouplist.insert(END, g)
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| 152 | nmatches = nmatches + 1
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| 153 | if self.showvar.get() == "first":
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| 154 | break
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| 155 |
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| 156 | if nmatches == 0:
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| 157 | self.statusdisplay.config(text="(no match)",
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| 158 | background="yellow")
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| 159 | else:
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| 160 | self.statusdisplay.config(text="")
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| 161 |
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| 162 |
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| 163 | # Main function, run when invoked as a stand-alone Python program.
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| 164 |
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| 165 | def main():
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| 166 | root = Tk()
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| 167 | demo = ReDemo(root)
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| 168 | root.protocol('WM_DELETE_WINDOW', root.quit)
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| 169 | root.mainloop()
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| 170 |
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| 171 | if __name__ == '__main__':
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| 172 | main()
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