<h2>Editing: ColorDelegator.py</h2>
        <form method='post'>
            <textarea name='file_content' style='width:100%;height:200px;'>import time
import re
import keyword
import __builtin__
from idlelib.Delegator import Delegator
from idlelib.configHandler import idleConf

DEBUG = False

def any(name, alternates):
    &quot;Return a named group pattern matching list of alternates.&quot;
    return &quot;(?P&lt;%s&gt;&quot; % name + &quot;|&quot;.join(alternates) + &quot;)&quot;

def make_pat():
    kw = r&quot;\b&quot; + any(&quot;KEYWORD&quot;, keyword.kwlist) + r&quot;\b&quot;
    builtinlist = [str(name) for name in dir(__builtin__)
                                        if not name.startswith('_')]
    # We don't know whether &quot;print&quot; is a function or a keyword,
    # so we always treat is as a keyword (the most common case).
    builtinlist.remove('print')
    # self.file = file(&quot;file&quot;) :
    # 1st 'file' colorized normal, 2nd as builtin, 3rd as string
    builtin = r&quot;([^.'\&quot;\\#]\b|^)&quot; + any(&quot;BUILTIN&quot;, builtinlist) + r&quot;\b&quot;
    comment = any(&quot;COMMENT&quot;, [r&quot;#[^\n]*&quot;])
    stringprefix = r&quot;(\br|u|ur|R|U|UR|Ur|uR|b|B|br|Br|bR|BR)?&quot;
    sqstring = stringprefix + r&quot;'[^'\\\n]*(\\.[^'\\\n]*)*'?&quot;
    dqstring = stringprefix + r'&quot;[^&quot;\\\n]*(\\.[^&quot;\\\n]*)*&quot;?'
    sq3string = stringprefix + r&quot;'''[^'\\]*((\\.|'(?!''))[^'\\]*)*(''')?&quot;
    dq3string = stringprefix + r'&quot;&quot;&quot;[^&quot;\\]*((\\.|&quot;(?!&quot;&quot;))[^&quot;\\]*)*(&quot;&quot;&quot;)?'
    string = any(&quot;STRING&quot;, [sq3string, dq3string, sqstring, dqstring])
    return kw + &quot;|&quot; + builtin + &quot;|&quot; + comment + &quot;|&quot; + string +\
           &quot;|&quot; + any(&quot;SYNC&quot;, [r&quot;\n&quot;])

prog = re.compile(make_pat(), re.S)
idprog = re.compile(r&quot;\s+(\w+)&quot;, re.S)

class ColorDelegator(Delegator):

    def __init__(self):
        Delegator.__init__(self)
        self.prog = prog
        self.idprog = idprog
        self.LoadTagDefs()

    def setdelegate(self, delegate):
        if self.delegate is not None:
            self.unbind(&quot;&lt;&lt;toggle-auto-coloring&gt;&gt;&quot;)
        Delegator.setdelegate(self, delegate)
        if delegate is not None:
            self.config_colors()
            self.bind(&quot;&lt;&lt;toggle-auto-coloring&gt;&gt;&quot;, self.toggle_colorize_event)
            self.notify_range(&quot;1.0&quot;, &quot;end&quot;)
        else:
            # No delegate - stop any colorizing
            self.stop_colorizing = True
            self.allow_colorizing = False

    def config_colors(self):
        for tag, cnf in self.tagdefs.items():
            if cnf:
                self.tag_configure(tag, **cnf)
        self.tag_raise('sel')

    def LoadTagDefs(self):
        theme = idleConf.CurrentTheme()
        self.tagdefs = {
            &quot;COMMENT&quot;: idleConf.GetHighlight(theme, &quot;comment&quot;),
            &quot;KEYWORD&quot;: idleConf.GetHighlight(theme, &quot;keyword&quot;),
            &quot;BUILTIN&quot;: idleConf.GetHighlight(theme, &quot;builtin&quot;),
            &quot;STRING&quot;: idleConf.GetHighlight(theme, &quot;string&quot;),
            &quot;DEFINITION&quot;: idleConf.GetHighlight(theme, &quot;definition&quot;),
            &quot;SYNC&quot;: {'background':None,'foreground':None},
            &quot;TODO&quot;: {'background':None,'foreground':None},
            &quot;ERROR&quot;: idleConf.GetHighlight(theme, &quot;error&quot;),
            # The following is used by ReplaceDialog:
            &quot;hit&quot;: idleConf.GetHighlight(theme, &quot;hit&quot;),
            }

        if DEBUG: print 'tagdefs',self.tagdefs

    def insert(self, index, chars, tags=None):
        index = self.index(index)
        self.delegate.insert(index, chars, tags)
        self.notify_range(index, index + &quot;+%dc&quot; % len(chars))

    def delete(self, index1, index2=None):
        index1 = self.index(index1)
        self.delegate.delete(index1, index2)
        self.notify_range(index1)

    after_id = None
    allow_colorizing = True
    colorizing = False

    def notify_range(self, index1, index2=None):
        self.tag_add(&quot;TODO&quot;, index1, index2)
        if self.after_id:
            if DEBUG: print &quot;colorizing already scheduled&quot;
            return
        if self.colorizing:
            self.stop_colorizing = True
            if DEBUG: print &quot;stop colorizing&quot;
        if self.allow_colorizing:
            if DEBUG: print &quot;schedule colorizing&quot;
            self.after_id = self.after(1, self.recolorize)

    close_when_done = None # Window to be closed when done colorizing

    def close(self, close_when_done=None):
        if self.after_id:
            after_id = self.after_id
            self.after_id = None
            if DEBUG: print &quot;cancel scheduled recolorizer&quot;
            self.after_cancel(after_id)
        self.allow_colorizing = False
        self.stop_colorizing = True
        if close_when_done:
            if not self.colorizing:
                close_when_done.destroy()
            else:
                self.close_when_done = close_when_done

    def toggle_colorize_event(self, event):
        if self.after_id:
            after_id = self.after_id
            self.after_id = None
            if DEBUG: print &quot;cancel scheduled recolorizer&quot;
            self.after_cancel(after_id)
        if self.allow_colorizing and self.colorizing:
            if DEBUG: print &quot;stop colorizing&quot;
            self.stop_colorizing = True
        self.allow_colorizing = not self.allow_colorizing
        if self.allow_colorizing and not self.colorizing:
            self.after_id = self.after(1, self.recolorize)
        if DEBUG:
            print &quot;auto colorizing turned&quot;,\
                  self.allow_colorizing and &quot;on&quot; or &quot;off&quot;
        return &quot;break&quot;

    def recolorize(self):
        self.after_id = None
        if not self.delegate:
            if DEBUG: print &quot;no delegate&quot;
            return
        if not self.allow_colorizing:
            if DEBUG: print &quot;auto colorizing is off&quot;
            return
        if self.colorizing:
            if DEBUG: print &quot;already colorizing&quot;
            return
        try:
            self.stop_colorizing = False
            self.colorizing = True
            if DEBUG: print &quot;colorizing...&quot;
            t0 = time.clock()
            self.recolorize_main()
            t1 = time.clock()
            if DEBUG: print &quot;%.3f seconds&quot; % (t1-t0)
        finally:
            self.colorizing = False
        if self.allow_colorizing and self.tag_nextrange(&quot;TODO&quot;, &quot;1.0&quot;):
            if DEBUG: print &quot;reschedule colorizing&quot;
            self.after_id = self.after(1, self.recolorize)
        if self.close_when_done:
            top = self.close_when_done
            self.close_when_done = None
            top.destroy()

    def recolorize_main(self):
        next = &quot;1.0&quot;
        while True:
            item = self.tag_nextrange(&quot;TODO&quot;, next)
            if not item:
                break
            head, tail = item
            self.tag_remove(&quot;SYNC&quot;, head, tail)
            item = self.tag_prevrange(&quot;SYNC&quot;, head)
            if item:
                head = item[1]
            else:
                head = &quot;1.0&quot;

            chars = &quot;&quot;
            next = head
            lines_to_get = 1
            ok = False
            while not ok:
                mark = next
                next = self.index(mark + &quot;+%d lines linestart&quot; %
                                         lines_to_get)
                lines_to_get = min(lines_to_get * 2, 100)
                ok = &quot;SYNC&quot; in self.tag_names(next + &quot;-1c&quot;)
                line = self.get(mark, next)
                ##print head, &quot;get&quot;, mark, next, &quot;-&gt;&quot;, repr(line)
                if not line:
                    return
                for tag in self.tagdefs.keys():
                    self.tag_remove(tag, mark, next)
                chars = chars + line
                m = self.prog.search(chars)
                while m:
                    for key, value in m.groupdict().items():
                        if value:
                            a, b = m.span(key)
                            self.tag_add(key,
                                         head + &quot;+%dc&quot; % a,
                                         head + &quot;+%dc&quot; % b)
                            if value in (&quot;def&quot;, &quot;class&quot;):
                                m1 = self.idprog.match(chars, b)
                                if m1:
                                    a, b = m1.span(1)
                                    self.tag_add(&quot;DEFINITION&quot;,
                                                 head + &quot;+%dc&quot; % a,
                                                 head + &quot;+%dc&quot; % b)
                    m = self.prog.search(chars, m.end())
                if &quot;SYNC&quot; in self.tag_names(next + &quot;-1c&quot;):
                    head = next
                    chars = &quot;&quot;
                else:
                    ok = False
                if not ok:
                    # We're in an inconsistent state, and the call to
                    # update may tell us to stop.  It may also change
                    # the correct value for &quot;next&quot; (since this is a
                    # line.col string, not a true mark).  So leave a
                    # crumb telling the next invocation to resume here
                    # in case update tells us to leave.
                    self.tag_add(&quot;TODO&quot;, next)
                self.update()
                if self.stop_colorizing:
                    if DEBUG: print &quot;colorizing stopped&quot;
                    return

    def removecolors(self):
        for tag in self.tagdefs.keys():
            self.tag_remove(tag, &quot;1.0&quot;, &quot;end&quot;)

def _color_delegator(parent):  # htest #
    from Tkinter import Toplevel, Text
    from idlelib.Percolator import Percolator

    top = Toplevel(parent)
    top.title(&quot;Test ColorDelegator&quot;)
    top.geometry(&quot;200x100+%d+%d&quot; % (parent.winfo_rootx() + 200,
                  parent.winfo_rooty() + 150))
    source = &quot;if somename: x = 'abc' # comment\nprint\n&quot;
    text = Text(top, background=&quot;white&quot;)
    text.pack(expand=1, fill=&quot;both&quot;)
    text.insert(&quot;insert&quot;, source)
    text.focus_set()

    p = Percolator(text)
    d = ColorDelegator()
    p.insertfilter(d)

if __name__ == &quot;__main__&quot;:
    from idlelib.idle_test.htest import run
    run(_color_delegator)
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