Class: RailroadDiagrams::OneOrMore

Inherits:
DiagramItem show all
Defined in:
lib/railroad_diagrams/one_or_more.rb

Instance Attribute Summary

Attributes inherited from DiagramItem

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

Instance Method Summary collapse

Methods inherited from DiagramItem

#add, #to_str, #write_svg

Constructor Details

#initialize(item, repeat = nil) ⇒ OneOrMore

Returns a new instance of OneOrMore.



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

def initialize(item, repeat = nil)
  super('g')
  @item = wrap_string(item)
  repeat ||= Skip.new
  @rep = wrap_string(repeat)
  @width = [@item.width, @rep.width].max + (AR * 2)
  @height = @item.height
  @up = @item.up
  @down = [AR * 2, @item.down + VS + @rep.up + @rep.height + @rep.down].max
  @needs_space = true
end

Instance Method Details

#format(x, y, width) ⇒ Object 



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# File 'lib/railroad_diagrams/one_or_more.rb', line 21

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

  # Draw item
  Path.new(x, y).right(AR).add(self)
  @item.format(x + AR, y, @width - (AR * 2)).add(self)
  Path.new(x + @width - AR, y + @height).right(AR).add(self)

  # Draw repeat arc
  distance_from_y = [AR * 2, @item.height + @item.down + VS + @rep.up].max
  Path.new(x + AR, y).arc('nw').down(distance_from_y - (AR * 2)).arc('ws').add(self)
  @rep.format(x + AR, y + distance_from_y, @width - (AR * 2)).add(self)
  Path.new(x + @width - AR, y + distance_from_y + @rep.height)
      .arc('se')
      .up(distance_from_y - (AR * 2) + @rep.height - @item.height)
      .arc('en')
      .add(self)

  self
end

#text_diagram ⇒ Object 



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# File 'lib/railroad_diagrams/one_or_more.rb', line 47

def text_diagram
  parts = TextDiagram.get_parts(
    %w[
      line repeat_top_left repeat_left repeat_bot_left repeat_top_right repeat_right repeat_bot_right
    ]
  )
  line, repeat_top_left, repeat_left, repeat_bot_left, repeat_top_right, repeat_right, repeat_bot_right = parts

  # Format the item and then format the repeat append it to the bottom, after a spacer.
  item_td = @item.text_diagram
  repeat_td = @rep.text_diagram
  fir_width = TextDiagram.max_width(item_td, repeat_td)
  repeat_td = repeat_td.expand(0, fir_width - repeat_td.width, 0, 0)
  item_td = item_td.expand(0, fir_width - item_td.width, 0, 0)
  item_and_repeat_td = item_td.append_below(repeat_td, [])

  # Build the left side of the repeat line and append the combined item and repeat to its right.
  left_lines = []
  left_lines << (repeat_top_left + line)
  left_lines += ["#{repeat_left} "] * ((item_td.height - item_td.entry) + repeat_td.entry - 1)
  left_lines << (repeat_bot_left + line)
  left_td = TextDiagram.new(0, 0, left_lines)
  left_td = left_td.append_right(item_and_repeat_td, '')

  # Build the right side of the repeat line and append it to the combined left side, item, and repeat's right.
  right_lines = []
  right_lines << (line + repeat_top_right)
  right_lines += [" #{repeat_right}"] * ((item_td.height - item_td.exit) + repeat_td.exit - 1)
  right_lines << (line + repeat_bot_right)
  right_td = TextDiagram.new(0, 0, right_lines)
  left_td.append_right(right_td, '')
end

#to_s ⇒ Object 



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# File 'lib/railroad_diagrams/one_or_more.rb', line 17

def to_s
  "OneOrMore(#{@item}, repeat=#{@rep})"
end

#walk(callback) ⇒ Object 



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# File 'lib/railroad_diagrams/one_or_more.rb', line 80

def walk(callback)
  callback.call(self)
  @item.walk(callback)
  @rep.walk(callback)
end