1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
"""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
keysym_opener = {"parenright":'(', "bracketright":'[', "braceright":'{'}
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.
if self.text.get("insert-1c") not in (')',']','}'):
return
hp = HyperParser(self.editwin, "insert-1c")
if not hp.is_in_code():
return
indices = hp.get_surrounding_brackets(keysym_opener[event.keysym], 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))
|
