python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/idlelib/parenmatch.py

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+"""ParenMatch -- for parenthesis matching.
+
+When you hit a right paren, the cursor should move briefly to the left
+paren.  Paren here is used generically; the matching applies to
+parentheses, square brackets, and curly braces.
+"""
+from idlelib.hyperparser import HyperParser
+from idlelib.config import idleConf
+
+_openers = {')':'(',']':'[','}':'{'}
+CHECK_DELAY = 100 # milliseconds
+
+class ParenMatch:
+    """Highlight matching openers and closers, (), [], and {}.
+
+    There are three supported styles of paren matching.  When a right
+    paren (opener) is typed:
+
+    opener -- highlight the matching left paren (closer);
+    parens -- highlight the left and right parens (opener and closer);
+    expression -- highlight the entire expression from opener to closer.
+    (For back compatibility, 'default' is a synonym for 'opener').
+
+    Flash-delay is the maximum milliseconds the highlighting remains.
+    Any cursor movement (key press or click) before that removes the
+    highlight.  If flash-delay is 0, there is no maximum.
+
+    TODO:
+    - Augment bell() with mismatch warning in status window.
+    - Highlight when cursor is moved to the right of a closer.
+      This might be too expensive to check.
+    """
+
+    RESTORE_VIRTUAL_EVENT_NAME = "<<parenmatch-check-restore>>"
+    # We want the restore event be called before the usual return and
+    # backspace events.
+    RESTORE_SEQUENCES = ("<KeyPress>", "<ButtonPress>",
+                         "<Key-Return>", "<Key-BackSpace>")
+
+    def __init__(self, editwin):
+        self.editwin = editwin
+        self.text = editwin.text
+        # Bind the check-restore event to the function restore_event,
+        # so that we can then use activate_restore (which calls event_add)
+        # and deactivate_restore (which calls event_delete).
+        editwin.text.bind(self.RESTORE_VIRTUAL_EVENT_NAME,
+                          self.restore_event)
+        self.counter = 0
+        self.is_restore_active = 0
+
+    @classmethod
+    def reload(cls):
+        cls.STYLE = idleConf.GetOption(
+            'extensions','ParenMatch','style', default='opener')
+        cls.FLASH_DELAY = idleConf.GetOption(
+                'extensions','ParenMatch','flash-delay', type='int',default=500)
+        cls.BELL = idleConf.GetOption(
+                'extensions','ParenMatch','bell', type='bool', default=1)
+        cls.HILITE_CONFIG = idleConf.GetHighlight(idleConf.CurrentTheme(),
+                                                  'hilite')
+
+    def activate_restore(self):
+        "Activate mechanism to restore text from highlighting."
+        if not self.is_restore_active:
+            for seq in self.RESTORE_SEQUENCES:
+                self.text.event_add(self.RESTORE_VIRTUAL_EVENT_NAME, seq)
+            self.is_restore_active = True
+
+    def deactivate_restore(self):
+        "Remove restore event bindings."
+        if self.is_restore_active:
+            for seq in self.RESTORE_SEQUENCES:
+                self.text.event_delete(self.RESTORE_VIRTUAL_EVENT_NAME, seq)
+            self.is_restore_active = False
+
+    def flash_paren_event(self, event):
+        "Handle editor 'show surrounding parens' event (menu or shortcut)."
+        indices = (HyperParser(self.editwin, "insert")
+                   .get_surrounding_brackets())
+        self.finish_paren_event(indices)
+        return "break"
+
+    def paren_closed_event(self, event):
+        "Handle user input of closer."
+        # If user bound non-closer to <<paren-closed>>, quit.
+        closer = self.text.get("insert-1c")
+        if closer not in _openers:
+            return
+        hp = HyperParser(self.editwin, "insert-1c")
+        if not hp.is_in_code():
+            return
+        indices = hp.get_surrounding_brackets(_openers[closer], True)
+        self.finish_paren_event(indices)
+        return  # Allow calltips to see ')'
+
+    def finish_paren_event(self, indices):
+        if indices is None and self.BELL:
+            self.text.bell()
+            return
+        self.activate_restore()
+        # self.create_tag(indices)
+        self.tagfuncs.get(self.STYLE, self.create_tag_expression)(self, indices)
+        # self.set_timeout()
+        (self.set_timeout_last if self.FLASH_DELAY else
+                            self.set_timeout_none)()
+
+    def restore_event(self, event=None):
+        "Remove effect of doing match."
+        self.text.tag_delete("paren")
+        self.deactivate_restore()
+        self.counter += 1   # disable the last timer, if there is one.
+
+    def handle_restore_timer(self, timer_count):
+        if timer_count == self.counter:
+            self.restore_event()
+
+    # any one of the create_tag_XXX methods can be used depending on
+    # the style
+
+    def create_tag_opener(self, indices):
+        """Highlight the single paren that matches"""
+        self.text.tag_add("paren", indices[0])
+        self.text.tag_config("paren", self.HILITE_CONFIG)
+
+    def create_tag_parens(self, indices):
+        """Highlight the left and right parens"""
+        if self.text.get(indices[1]) in (')', ']', '}'):
+            rightindex = indices[1]+"+1c"
+        else:
+            rightindex = indices[1]
+        self.text.tag_add("paren", indices[0], indices[0]+"+1c", rightindex+"-1c", rightindex)
+        self.text.tag_config("paren", self.HILITE_CONFIG)
+
+    def create_tag_expression(self, indices):
+        """Highlight the entire expression"""
+        if self.text.get(indices[1]) in (')', ']', '}'):
+            rightindex = indices[1]+"+1c"
+        else:
+            rightindex = indices[1]
+        self.text.tag_add("paren", indices[0], rightindex)
+        self.text.tag_config("paren", self.HILITE_CONFIG)
+
+    tagfuncs = {
+        'opener': create_tag_opener,
+        'default': create_tag_opener,
+        'parens': create_tag_parens,
+        'expression': create_tag_expression,
+        }
+
+    # any one of the set_timeout_XXX methods can be used depending on
+    # the style
+
+    def set_timeout_none(self):
+        """Highlight will remain until user input turns it off
+        or the insert has moved"""
+        # After CHECK_DELAY, call a function which disables the "paren" tag
+        # if the event is for the most recent timer and the insert has changed,
+        # or schedules another call for itself.
+        self.counter += 1
+        def callme(callme, self=self, c=self.counter,
+                   index=self.text.index("insert")):
+            if index != self.text.index("insert"):
+                self.handle_restore_timer(c)
+            else:
+                self.editwin.text_frame.after(CHECK_DELAY, callme, callme)
+        self.editwin.text_frame.after(CHECK_DELAY, callme, callme)
+
+    def set_timeout_last(self):
+        """The last highlight created will be removed after FLASH_DELAY millisecs"""
+        # associate a counter with an event; only disable the "paren"
+        # tag if the event is for the most recent timer.
+        self.counter += 1
+        self.editwin.text_frame.after(
+            self.FLASH_DELAY,
+            lambda self=self, c=self.counter: self.handle_restore_timer(c))
+
+
+ParenMatch.reload()
+
+
+if __name__ == '__main__':
+    from unittest import main
+    main('idlelib.idle_test.test_parenmatch', verbosity=2)