Class: RailroadDiagrams::MultipleChoice

Inherits:
DiagramMultiContainer show all
Defined in:
lib/railroad_diagrams/multiple_choice.rb

Instance Attribute Summary

Attributes inherited from DiagramItem

#attrs, #children, #down, #height, #needs_space, #up, #width

Instance Method Summary collapse

Methods inherited from DiagramMultiContainer

#to_str, #walk

Methods inherited from DiagramItem

#add, #to_str, #walk, #write_svg

Constructor Details

#initialize(default, type, *items) ⇒ MultipleChoice

Returns a new instance of MultipleChoice.

Raises:

  • (ArgumentError) 


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# File 'lib/railroad_diagrams/multiple_choice.rb', line 5

def initialize(default, type, *items)
  super('g', items)
  raise ArgumentError, "default must be between 0 and #{items.length - 1}" unless (0...items.length).cover?(default)
  raise ArgumentError, "type must be 'any' or 'all'" unless %w[any all].include?(type)

  @default = default
  @type = type
  @needs_space = true
  @inner_width = @items.map(&:width).max
  @width = 30 + AR + @inner_width + AR + 20
  @up = @items[0].up
  @down = @items[-1].down
  @height = @items[default].height

  @items.each_with_index do |item, i|
    minimum =
      if [default - 1, default + 1].include?(i)
        10 + AR
      else
        AR
      end

    if i < default
      @up += [minimum, item.height + item.down + VS + @items[i + 1].up].max
    elsif i > default
      @down += [minimum, item.up + VS + @items[i - 1].down + @items[i - 1].height].max
    end
  end

  @down -= @items[default].height # already counted in @height
end

Instance Method Details

#format(x, y, width) ⇒ Object 



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# File 'lib/railroad_diagrams/multiple_choice.rb', line 42

def format(x, y, width)
  left_gap, right_gap = determine_gaps(width, @width)

  # Hook up the two sides if self is narrower than its stated width.
  Path.new(x, y).h(left_gap).add(self)
  Path.new(x + left_gap + @width, y + @height).h(right_gap).add(self)
  x += left_gap

  default = @items[@default]

  # Do the elements that curve above
  above = @items[0...@default].reverse
  distance_from_y = 0
  distance_from_y = [10 + AR, default.up + VS + above.first.down + above.first.height].max if above.any?

  double_enumerate(above).each do |i, ni, item|
    Path.new(x + 30, y).up(distance_from_y - AR).arc('wn').add(self)
    item.format(x + 30 + AR, y - distance_from_y, @inner_width).add(self)
    Path.new(x + 30 + AR + @inner_width, y - distance_from_y + item.height)
        .arc('ne')
        .down(distance_from_y - item.height + default.height - AR - 10)
        .add(self)
    distance_from_y += [AR, item.up + VS + above[i + 1].down + above[i + 1].height].max if ni < -1
  end

  # Do the straight-line path.
  Path.new(x + 30, y).right(AR).add(self)
  @items[@default].format(x + 30 + AR, y, @inner_width).add(self)
  Path.new(x + 30 + AR + @inner_width, y + @height).right(AR).add(self)

  # Do the elements that curve below
  below = @items[(@default + 1)..-1] || []
  distance_from_y = [10 + AR, default.height + default.down + VS + below.first.up].max if below.any?

  below.each_with_index do |item, i|
    Path.new(x + 30, y).down(distance_from_y - AR).arc('ws').add(self)
    item.format(x + 30 + AR, y + distance_from_y, @inner_width).add(self)
    Path.new(x + 30 + AR + @inner_width, y + distance_from_y + item.height)
        .arc('se')
        .up(distance_from_y - AR + item.height - default.height - 10)
        .add(self)

    distance_from_y += [AR, item.height + item.down + VS + (below[i + 1]&.up || 0)].max
  end

  text = DiagramItem.new('g', attrs: { 'class' => 'diagram-text' }).add(self)
  DiagramItem.new(
    'title',
    text: @type == 'any' ? 'take one or more branches, once each, in any order' : 'take all branches, once each, in any order'
  ).add(text)

  DiagramItem.new(
    'path',
    attrs: {
      'd' => "M #{x + 30} #{y - 10} h -26 a 4 4 0 0 0 -4 4 v 12 a 4 4 0 0 0 4 4 h 26 z",
      'class' => 'diagram-text'
    }
  ).add(text)

  DiagramItem.new(
    'text',
    text: @type == 'any' ? '1+' : 'all',
    attrs: { 'x' => x + 15, 'y' => y + 4, 'class' => 'diagram-text' }
  ).add(text)

  DiagramItem.new(
    'path',
    attrs: {
      'd' => "M #{x + @width - 20} #{y - 10} h 16 a 4 4 0 0 1 4 4 v 12 a 4 4 0 0 1 -4 4 h -16 z",
      'class' => 'diagram-text'
    }
  ).add(text)

  DiagramItem.new(
    'text',
    text: '↺',
    attrs: { 'x' => x + @width - 10, 'y' => y + 4, 'class' => 'diagram-arrow' }
  ).add(text)

  self
end

#text_diagram ⇒ Object 



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# File 'lib/railroad_diagrams/multiple_choice.rb', line 124

def text_diagram
  multi_repeat = TextDiagram.get_parts(['multi_repeat']).first
  any_all = TextDiagram.rect(@type == 'any' ? '1+' : 'all')
  diagram_td = Choice.new(0, Skip.new).text_diagram
  repeat_td = TextDiagram.rect(multi_repeat)
  diagram_td = any_all.append_right(diagram_td, '')
  diagram_td.append_right(repeat_td, '')
end

#to_s ⇒ Object 



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# File 'lib/railroad_diagrams/multiple_choice.rb', line 37

def to_s
  items = @items.map(&:to_s).join(', ')
  "MultipleChoice(#{@default}, #{@type}, #{items})"
end