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require 'cucumber/cucumber_expressions/group_builder'
require 'cucumber/cucumber_expressions/errors'
module Cucumber
module CucumberExpressions
class TreeRegexp
attr_reader :regexp, :group_builder
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
@name_capturing_maybe = false
char_class = false
@regexp.source.each_char.with_index do |c, n|
if c == '[' && !escaping
char_class = true
elsif c == ']' && !escaping
char_class = false
elsif c == '(' && !escaping && !char_class
@stack.push(GroupBuilder.new)
group_start_stack.push(n+1)
@non_capturing_maybe = false
elsif c == ')' && !escaping && !char_class
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
end_group
elsif c == '?' && last == '('
@non_capturing_maybe = true
elsif (c == '<') && @non_capturing_maybe
@name_capturing_maybe = true
elsif (c == ':' || c == '!' || c == '=') && last == '?' && @non_capturing_maybe
end_non_capturing_group()
elsif (c == '=' || c == '!') && last == '<' && @name_capturing_maybe
end_non_capturing_group()
elsif @name_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
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
private
def end_non_capturing_group
@stack.last.set_non_capturing!
end_group
end
def end_group
@non_capturing_maybe = false
@name_capturing_maybe = false
end
end
end
end
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