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