Method: Parser::Source::Map#expression

Defined in:
lib/parser/source/map.rb,
lib/parser/source/map.rb

#expression ⇒ Range (readonly)

Returns:


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# File 'lib/parser/source/map.rb', line 70

class Map
  attr_reader :node
  attr_reader :expression

  ##
  # @param [Range] expression
  def initialize(expression)
    @expression = expression
  end

  ##
  # @api private
  def initialize_copy(other)
    super
    @node = nil
  end

  ##
  # @api private
  def node=(node)
    @node = node
    freeze
    @node
  end

  ##
  # A shortcut for `self.expression.line`.
  # @return [Integer]
  #
  def line
    @expression.line
  end

  alias_method :first_line, :line

  ##
  # A shortcut for `self.expression.column`.
  # @return [Integer]
  #
  def column
    @expression.column
  end

  ##
  # A shortcut for `self.expression.last_line`.
  # @return [Integer]
  #
  def last_line
    @expression.last_line
  end

  ##
  # A shortcut for `self.expression.last_column`.
  # @return [Integer]
  #
  def last_column
    @expression.last_column
  end

  ##
  # @api private
  #
  def with_expression(expression_l)
    with { |map| map.update_expression(expression_l) }
  end

  ##
  # Compares source maps.
  # @return [Boolean]
  #
  def ==(other)
    other.class == self.class &&
      instance_variables.map do |ivar|
        instance_variable_get(ivar) ==
          other.send(:instance_variable_get, ivar)
      end.reduce(:&)
  end

  ##
  # Converts this source map to a hash with keys corresponding to
  # ranges. For example, if called on an instance of {Collection},
  # which adds the `begin` and `end` ranges, the resulting hash
  # will contain keys `:expression`, `:begin` and `:end`.
  #
  # @example
  #  require 'parser/current'
  #
  #  p Parser::CurrentRuby.parse('[1, 2]').loc.to_hash
  #  # => {
  #  #   :begin => #<Source::Range (string) 0...1>,
  #  #   :end => #<Source::Range (string) 5...6>,
  #  #   :expression => #<Source::Range (string) 0...6>
  #  # }
  #
  # @return [Hash<Symbol, Parser::Source::Range>]
  #
  def to_hash
    instance_variables.inject({}) do |hash, ivar|
      next hash if ivar.to_sym == :@node
      hash[ivar[1..-1].to_sym] = instance_variable_get(ivar)
      hash
    end
  end

  protected

  def with(&block)
    dup.tap(&block)
  end

  def update_expression(expression_l)
    @expression = expression_l
  end
end