Class: Cucumber::CucumberExpressions::CucumberExpression

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

Constant Summary collapse

ESCAPE_REGEXP =

Does not include (){} characters because they have special meaning

/([\\^\[$.|?*+\]])/
PARAMETER_REGEXP = 
/{([^}]+)}/
OPTIONAL_REGEXP = 
/\(([^)]+)\)/
ALTERNATIVE_NON_WHITESPACE_TEXT_REGEXP = 
/([^\s^\/]+)((\/[^\s^\/]+)+)/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expression, parameter_type_registry) ⇒ CucumberExpression

Returns a new instance of CucumberExpression.



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# File 'lib/cucumber/cucumber_expressions/cucumber_expression.rb', line 16

def initialize(expression, parameter_type_registry)
  @source = expression
  @parameter_types = []
  regexp = '^'
  match_offset = 0

  expression = expression.gsub(ESCAPE_REGEXP, '\\\\\1')

  # Create non-capturing, optional capture groups from parenthesis
  expression = expression.gsub(OPTIONAL_REGEXP, '(?:\1)?')

  expression = expression.gsub(ALTERNATIVE_NON_WHITESPACE_TEXT_REGEXP) do |_|
    "(?:#{$1}#{$2.tr('/', '|')})"
  end

  loop do
    match = PARAMETER_REGEXP.match(expression, match_offset)
    break if match.nil?

    type_name = match[1]

    parameter_type = parameter_type_registry.lookup_by_type_name(type_name)
    raise UndefinedParameterTypeError.new(type_name) if parameter_type.nil?
    @parameter_types.push(parameter_type)

    text = expression.slice(match_offset...match.offset(0)[0])
    capture_regexp = build_capture_regexp(parameter_type.regexps)
    match_offset = match.offset(0)[1]
    regexp += text
    regexp += capture_regexp
  end
  regexp += expression.slice(match_offset..-1)
  regexp += '$'
  @tree_regexp = TreeRegexp.new(regexp)
end

Instance Attribute Details

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/cucumber/cucumber_expressions/cucumber_expression.rb', line 14

def source
  @source
end

Instance Method Details

#match(text) ⇒ Object 



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# File 'lib/cucumber/cucumber_expressions/cucumber_expression.rb', line 52

def match(text)
  Argument.build(@tree_regexp, text, @parameter_types)
end

#regexp ⇒ Object 



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# File 'lib/cucumber/cucumber_expressions/cucumber_expression.rb', line 56

def regexp
  @tree_regexp.regexp
end

#to_s ⇒ Object 



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# File 'lib/cucumber/cucumber_expressions/cucumber_expression.rb', line 60

def to_s
  @source.inspect
end