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
|
# File 'lib/brevity/parsing/expression/label.rb', line 16
def _nt_label
start_index = index
if node_cache[:label].has_key?(index)
cached = node_cache[:label][index]
if cached
node_cache[:label][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0, s0 = index, []
if has_terminal?(@regexps[gr = '\A[_A-Za-z]'] ||= Regexp.new(gr), :regexp, index)
r1 = true
@index += 1
else
terminal_parse_failure('[_A-Za-z]')
r1 = nil
end
s0 << r1
if r1
s2, i2 = [], index
loop do
if has_terminal?(@regexps[gr = '\A[_A-Za-z0-9]'] ||= Regexp.new(gr), :regexp, index)
r3 = true
@index += 1
else
terminal_parse_failure('[_A-Za-z0-9]')
r3 = nil
end
if r3
s2 << r3
else
break
end
end
r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
s0 << r2
end
if s0.last
r0 = instantiate_node(LabelNode,input, i0...index, s0)
r0.extend(Label0)
else
@index = i0
r0 = nil
end
node_cache[:label][start_index] = r0
r0
end
|