Class: Cucumber::CucumberExpressions::TreeRegexp

Inherits:
Object
  • Object
show all
Defined in:
lib/cucumber/cucumber_expressions/tree_regexp.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(regexp) ⇒ TreeRegexp

Returns a new instance of TreeRegexp.



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
 
# File 'lib/cucumber/cucumber_expressions/tree_regexp.rb', line 9

def initialize(regexp)
  @regexp = regexp.is_a?(Regexp) ? regexp : Regexp.new(regexp)
  stack = [GroupBuilder.new]
  group_start_stack = []
  last = nil
  escaping = false
  non_capturing_maybe = false

  @regexp.source.split('').each_with_index do |c, n|
    if c == '(' && !escaping
      stack.push(GroupBuilder.new)
      group_start_stack.push(n+1)
      non_capturing_maybe = false
    elsif c == ')' && !escaping
      gb = stack.pop
      group_start = group_start_stack.pop
      if gb.capturing?
        gb.source = @regexp.source[group_start...n]
        stack.last.add(gb)
      else
        gb.move_children_to(stack.last)
      end
      non_capturing_maybe = false
    elsif c == '?' && last == '('
      non_capturing_maybe = true
    elsif c == ':' && non_capturing_maybe
      stack.last.set_non_capturing!
      non_capturing_maybe = false
    elsif c == '<' && non_capturing_maybe
      raise CucumberExpressionError.new("Named capture groups are not supported. See https://github.com/cucumber/cucumber/issues/329")
    end

    escaping = c == '\\' && !escaping
    last = c
  end
  @group_builder = stack.pop
end

Instance Attribute Details

#group_builder ⇒ Object (readonly)

Returns the value of attribute group_builder.



7
8
9
 
# File 'lib/cucumber/cucumber_expressions/tree_regexp.rb', line 7

def group_builder
  @group_builder
end

#regexp ⇒ Object (readonly)

Returns the value of attribute regexp.



7
8
9
 
# File 'lib/cucumber/cucumber_expressions/tree_regexp.rb', line 7

def regexp
  @regexp
end

Instance Method Details

#match(s) ⇒ Object 



47
48
49
50
51
52
 
# File 'lib/cucumber/cucumber_expressions/tree_regexp.rb', line 47

def match(s)
  match = @regexp.match(s)
  return nil if match.nil?
  group_indices = (0..match.length).to_a.to_enum
  @group_builder.build(match, group_indices)
end