Class: RailroadDiagrams::NonTerminal

Inherits:
DiagramItem show all
Defined in:
lib/railroad_diagrams/non_terminal.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, #walk, #write_svg

Constructor Details

#initialize(text, href = nil, title = nil, cls: '') ⇒ NonTerminal

Returns a new instance of NonTerminal.



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

def initialize(text, href = nil, title = nil, cls: '')
  super('g', attrs: { 'class' => "non-terminal #{cls}" })
  @text = text
  @href = href
  @title = title
  @cls = cls
  @width = (text.length * CHAR_WIDTH) + 20
  @up = 11
  @down = 11
  @needs_space = true
end

Instance Method Details

#format(x, y, width) ⇒ Object 



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# File 'lib/railroad_diagrams/non_terminal.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).h(right_gap).add(self)

  DiagramItem.new(
    'rect',
    attrs: {
      'x' => x + left_gap,
      'y' => y - 11,
      'width' => @width,
      'height' => @up + @down
    }
  ).add(self)

  text = DiagramItem.new(
    'text',
    attrs: {
      'x' => x + left_gap + (@width / 2),
      'y' => y + 4
    },
    text: @text
  )
  if @href
    a = DiagramItem.new(
      'a',
      attrs: {
        'xlink:href' => @href
      },
      text: text
    ).add(self)
    text.add(a)
  else
    text.add(self)
  end
  DiagramItem.new('title', attrs: {}, text: @title).add(self) if @title
  self
end

#text_diagram ⇒ Object 



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# File 'lib/railroad_diagrams/non_terminal.rb', line 62

def text_diagram
  # NOTE: href, title, and cls are ignored for text diagrams.
  TextDiagram.rect(@text)
end

#to_s ⇒ Object 



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

def to_s
  "NonTerminal(#{@text}, href=#{@href}, title=#{@title}, cls=#{@cls})"
end