# frozen_string_literal: true

class DebuggerCode
  # Represents a line of code. A line of code is a tuple, which consists of a
  # line and a line number. A `LOC` object's state (namely, the line
  # parameter) can be changed via instance methods. `Pry::Code` heavily uses
  # this class.
  #
  # @api private
  # @example
  #   loc = LOC.new("def example\n  :example\nend", 1)
  #   puts loc.line
  #   def example
  #     :example
  #   end
  #   #=> nil
  #
  #   loc.indent(3)
  #   loc.line #=> "   def example\n  :example\nend"
  class LOC
    # @return [Array<String, Integer>]
    attr_reader :tuple

    # @param [String] line The line of code.
    # @param [Integer] lineno The position of the +line+.
    def initialize(line, lineno)
      @tuple = [line.chomp, lineno.to_i]
    end

    # @return [Boolean]
    def ==(other)
      other.tuple == tuple
    end

    def dup
      self.class.new(line, lineno)
    end

    # @return [String]
    def line
      tuple.first
    end

    # @return [Integer]
    def lineno
      tuple.last
    end

    # Prepends the line number `lineno` to the `line`.
    # @param [Integer] max_width
    # @return [void]
    def add_line_number(max_width = 0)
      padded = lineno.to_s.rjust(max_width)
      tuple[0] = "#{padded}: #{line}"
    end

    # Prepends a marker "=>" or an empty marker to the +line+.
    #
    # @param [Integer] marker_lineno If it is equal to the `lineno`, then
    #   prepend a hashrocket. Otherwise, an empty marker.
    # @return [void]
    def add_marker(marker_lineno)
      tuple[0] =
        if lineno == marker_lineno
          " => #{line}".cyan
        else
          "    #{line}"
        end
    end

    # Indents the `line` with +distance+ spaces.
    #
    # @param [Integer] distance
    # @return [void]
    def indent(distance)
      tuple[0] = "#{' ' * distance}#{line}"
    end
  end
  end