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
|
# frozen_string_literal: true
require 'spec_helper'
RSpec.describe('Conditional parsing') do
include_examples 'parse', /(?<A>a)(?(<A>)T|F)/,
[1] => [:conditional, :open, Conditional::Expression, to_s: '(?(<A>)T|F)', reference: 'A', ts: 7],
[1, 0] => [:conditional, :condition, Conditional::Condition, to_s: '(<A>)', reference: 'A', ts: 9],
[1, 1] => [:expression, :sequence, Conditional::Branch, to_s: 'T', ts: 14],
[1, 1, 0] => [:literal, text: 'T', ts: 14],
[1, 2] => [:expression, :sequence, Conditional::Branch, to_s: 'F', ts: 16],
[1, 2, 0] => [:literal, text: 'F', ts: 16]
include_examples 'parse', /(a)(?(1)T|F)/,
[1] => [:conditional, :open, Conditional::Expression, to_s: '(?(1)T|F)', reference: 1, ts: 3],
[1, 0] => [:conditional, :condition, Conditional::Condition, to_s: '(1)', reference: 1, ts: 5],
[1, 1] => [:expression, :sequence, Conditional::Branch, to_s: 'T', ts: 8],
[1, 1, 0] => [:literal, text: 'T', ts: 8],
[1, 2] => [:expression, :sequence, Conditional::Branch, to_s: 'F', ts: 10],
[1, 2, 0] => [:literal, text: 'F', ts: 10]
include_examples 'parse', /(foo)(?(1)\d+|(\w)){42}/,
[1] => [Conditional::Expression, quantified?: true, to_s: '(?(1)\d+|(\w)){42}'],
[1, 0] => [Conditional::Condition, quantified?: false],
[1, 1] => [Conditional::Branch, quantified?: false],
[1, 1, 0] => [:digit, quantified?: true, to_s: '\d+'],
[1, 2] => [Conditional::Branch, quantified?: false]
# test nested and mixed with alternations
include_examples 'parse', <<-EOS.gsub(/\s/, ''),
(
(a)
|
(b)
|
(
(
?(2)
(c(d|e)+)?
|
(
?(3)
f
|
(
?(4)
(g|(h)(i))
)
)
)
)
)
EOS
[0] => [Group::Capture, count: 1],
[0, 0] => [Alternation, count: 3],
[0, 0, 2] => [Alternative, count: 1],
[0, 0, 2, 0] => [Group::Capture, count: 1],
[0, 0, 2, 0, 0] => [Conditional::Expression, count: 3, conditional_level: 0],
[0, 0, 2, 0, 0, 0] => [Conditional::Condition, to_s: '(2)', conditional_level: 1],
[0, 0, 2, 0, 0, 1] => [Conditional::Branch, to_s: '(c(d|e)+)?', conditional_level: 1],
[0, 0, 2, 0, 0, 2] => [Conditional::Branch, to_s: '(?(3)f|(?(4)(g|(h)(i))))', conditional_level: 1],
[0, 0, 2, 0, 0, 2, 0] => [Conditional::Expression, count: 3, conditional_level: 1],
[0, 0, 2, 0, 0, 2, 0, 0] => [Conditional::Condition, to_s: '(3)', conditional_level: 2],
[0, 0, 2, 0, 0, 2, 0, 1] => [Conditional::Branch, count: 1, to_s: 'f', conditional_level: 2],
[0, 0, 2, 0, 0, 2, 0, 1, 0] => [Literal, text: 'f', conditional_level: 2]
# test empty branch
include_examples 'parse', /(?<A>a)(?(<A>)T|)/,
[1] => [Conditional::Expression, count: 3, to_s: '(?(<A>)T|)'],
[1, 2] => [Conditional::Branch, to_s: '', ts: 16]
# test insignificant leading zeros in the condition's group number ref
include_examples 'parse', /(a)(?(001)T)/,
[1, 0] => [Conditional::Condition, to_s: '(001)', reference: 1]
end
|
