173 lines
6.5 KiB
Python
173 lines
6.5 KiB
Python
"""ParenMatch -- An IDLE extension 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 HyperParser import HyperParser
|
|
from configHandler import idleConf
|
|
|
|
_openers = {')':'(',']':'[','}':'{'}
|
|
CHECK_DELAY = 100 # miliseconds
|
|
|
|
class ParenMatch:
|
|
"""Highlight matching parentheses
|
|
|
|
There are three supported style of paren matching, based loosely
|
|
on the Emacs options. The style is select based on the
|
|
HILITE_STYLE attribute; it can be changed used the set_style
|
|
method.
|
|
|
|
The supported styles are:
|
|
|
|
default -- When a right paren is typed, highlight the matching
|
|
left paren for 1/2 sec.
|
|
|
|
expression -- When a right paren is typed, highlight the entire
|
|
expression from the left paren to the right paren.
|
|
|
|
TODO:
|
|
- extend IDLE with configuration dialog to change options
|
|
- implement rest of Emacs highlight styles (see below)
|
|
- print mismatch warning in IDLE status window
|
|
|
|
Note: In Emacs, there are several styles of highlight where the
|
|
matching paren is highlighted whenever the cursor is immediately
|
|
to the right of a right paren. I don't know how to do that in Tk,
|
|
so I haven't bothered.
|
|
"""
|
|
menudefs = [
|
|
('edit', [
|
|
("Show surrounding parens", "<<flash-paren>>"),
|
|
])
|
|
]
|
|
STYLE = idleConf.GetOption('extensions','ParenMatch','style',
|
|
default='expression')
|
|
FLASH_DELAY = idleConf.GetOption('extensions','ParenMatch','flash-delay',
|
|
type='int',default=500)
|
|
HILITE_CONFIG = idleConf.GetHighlight(idleConf.CurrentTheme(),'hilite')
|
|
BELL = idleConf.GetOption('extensions','ParenMatch','bell',
|
|
type='bool',default=1)
|
|
|
|
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
|
|
self.set_style(self.STYLE)
|
|
|
|
def activate_restore(self):
|
|
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):
|
|
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 set_style(self, style):
|
|
self.STYLE = style
|
|
if style == "default":
|
|
self.create_tag = self.create_tag_default
|
|
self.set_timeout = self.set_timeout_last
|
|
elif style == "expression":
|
|
self.create_tag = self.create_tag_expression
|
|
self.set_timeout = self.set_timeout_none
|
|
|
|
def flash_paren_event(self, event):
|
|
indices = HyperParser(self.editwin, "insert").get_surrounding_brackets()
|
|
if indices is None:
|
|
self.warn_mismatched()
|
|
return
|
|
self.activate_restore()
|
|
self.create_tag(indices)
|
|
self.set_timeout_last()
|
|
|
|
def paren_closed_event(self, event):
|
|
# If it was a shortcut and not really a closing paren, 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)
|
|
if indices is None:
|
|
self.warn_mismatched()
|
|
return
|
|
self.activate_restore()
|
|
self.create_tag(indices)
|
|
self.set_timeout()
|
|
|
|
def restore_event(self, event=None):
|
|
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()
|
|
|
|
def warn_mismatched(self):
|
|
if self.BELL:
|
|
self.text.bell()
|
|
|
|
# any one of the create_tag_XXX methods can be used depending on
|
|
# the style
|
|
|
|
def create_tag_default(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_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)
|
|
|
|
# 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 .5 sec"""
|
|
# 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))
|