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
|
"Provides Indentation services for languages with indentation similar to Python"
from .lexer import Token
###{standalone
class Indenter:
def __init__(self):
self.paren_level = None
self.indent_level = None
assert self.tab_len > 0
def handle_NL(self, token):
if self.paren_level > 0:
return
yield token
indent_str = token.rsplit('\n', 1)[1] # Tabs and spaces
indent = indent_str.count(' ') + indent_str.count('\t') * self.tab_len
if indent > self.indent_level[-1]:
self.indent_level.append(indent)
yield Token.new_borrow_pos(self.INDENT_type, indent_str, token)
else:
while indent < self.indent_level[-1]:
self.indent_level.pop()
yield Token.new_borrow_pos(self.DEDENT_type, indent_str, token)
assert indent == self.indent_level[-1], '%s != %s' % (indent, self.indent_level[-1])
def _process(self, stream):
for token in stream:
if token.type == self.NL_type:
for t in self.handle_NL(token):
yield t
else:
yield token
if token.type in self.OPEN_PAREN_types:
self.paren_level += 1
elif token.type in self.CLOSE_PAREN_types:
self.paren_level -= 1
assert self.paren_level >= 0
while len(self.indent_level) > 1:
self.indent_level.pop()
yield Token(self.DEDENT_type, '')
assert self.indent_level == [0], self.indent_level
def process(self, stream):
self.paren_level = 0
self.indent_level = [0]
return self._process(stream)
# XXX Hack for ContextualLexer. Maybe there's a more elegant solution?
@property
def always_accept(self):
return (self.NL_type,)
###}
|
