184 lines
7.0 KiB
Python
184 lines
7.0 KiB
Python
"""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__':
|
|
import unittest
|
|
unittest.main('idlelib.idle_test.test_parenmatch', verbosity=2)
|