Class: SequenceDiagram::Diagram

Inherits:
Object
  • Object
show all
Defined in:
lib/yard-sd/sequence_diagram/diagram.rb

Defined Under Namespace

Classes: Block, Call

Constant Summary collapse

@@uid = 
0

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Diagram

Returns a new instance of Diagram.



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# File 'lib/yard-sd/sequence_diagram/diagram.rb', line 12

def initialize
  @participants = []
  @calls        = []
  @uid          = @@uid += 1
end

Instance Attribute Details

#uid ⇒ Object (readonly)

Returns the value of attribute uid.



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# File 'lib/yard-sd/sequence_diagram/diagram.rb', line 11

def uid
  @uid
end

Instance Method Details

#error(kind, information) ⇒ Object

Raises:



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# File 'lib/yard-sd/sequence_diagram/diagram.rb', line 74

def error(kind, information)
  raise ParseError, [kind, information].inspect
end

#parse(s) ⇒ Object 



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# File 'lib/yard-sd/sequence_diagram/diagram.rb', line 18

def parse(s)
  last_calls  = Hash.new {|h, k| h[k] = []}
  blocks      = [Block.new(0, nil, nil)]
  last_indent = 0

  s.each_line do |line|
    line.chomp!
    next if line.empty?

    case line
    when /^(participant|thread)(?:\[(\d+)\])? ("?)(.+?)\3(?: as (.+))?$/
      distance = $2 && $2.to_i
      name = $4
      aliasing = $5 || name
      thread = $1 == "thread"
      @participants << Participant.new(name, aliasing, distance, thread)
    when /^(\s*)block "([^"]+)" "([^"]+)"/
      if $1.size < last_indent
        blocks.pop
      end

      blocks << Block.new(blocks.size, $2, $3)
    when /^(\s*)(.+?)\s*(->|-->)\s*(.+?):(?: (.+))?$/
      p1      = @participants.find {|p| p.aliasing == $2}
      p2      = @participants.find {|p| p.aliasing == $4}

      error(:unknown_participant, line) if p1.nil?
      error(:unknown_participant, line) if p2.nil?

      message = $5.to_s

      if $1.size < last_indent
        blocks.pop
      end

      last_indent = $1.size

      case $3
      when "->"
        call = Call.new(p1, p2, message, nil, blocks.last)
        last_calls[p1] << call
        @calls << call
      when "-->"
        last_calls[p2].pop.return = message.to_s
        @calls << :pop
      end
    when /^\s*noreturn$/
      @calls << :pop
    else
      error(:cannot_parse, line)
    end
  end

  self
end

#to_png(options = {}) ⇒ Object 



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# File 'lib/yard-sd/sequence_diagram/diagram.rb', line 134

def to_png(options = {})
  graph    = self.to_s
  tex      = Template.sub("%%EMBED\n", graph.sub(/\n+$/, ""))
  dir      = Dir.mktmpdir
  image    = nil

  Dir.chdir(dir) do
    # File.open("/tmp/debug.tex", "w"){|f| f.print tex}
    IO.popen("pdflatex -halt-on-error", "w+") do |pipe|
      pipe.write tex
      pipe.close_write
      pipe.read
    end

    if $?.exitstatus != 0
      error("Couldn't compile latex", nil)
    end

    args = ["-depth", "4",
            "-quality", "95",
            "-colorspace", "RGB",
            "-density", "500x500",
            "-flatten"]

    args << "-resize" << options[:size] if options[:size]

    image = `convert #{args.join(" ")} texput.pdf png:-`
  end

  FileUtils.rm_rf(dir)

  return image
end

#to_s ⇒ Object 



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# File 'lib/yard-sd/sequence_diagram/diagram.rb', line 78

def to_s
  s = "\\begin{sequencediagram}\n"
  @participants.each do |p|
    s << p.to_s << "\n"
  end

  last_callee = nil
  prev_block_level  = 0
  open = []

  indent = 0
  @calls.each do |call|
    if call == :pop
      indent -= 1
      s << " " * indent << "\\end{#{open.pop}}\n"
      next
    end

    if call.block.level > prev_block_level
      s << " " * indent << "\\begin{sdblock}{#{call.block.name}}{#{call.block.description}}\n"
      indent += 1
    elsif call.block.level < prev_block_level
      indent -= 1
      s << " " * indent << "\\end{sdblock}\n"
    end
    prev_block_level = call.block.level

    if !call.return.nil?
      if call.p1 == call.p2
        s << " " * indent << "\\begin{callself}{#{call.p1.uid}}{#{SequenceDiagram.latex_escape(call.message)}}{#{SequenceDiagram.latex_escape(call.return)}}\n"
        open << :callself
      else
        s << " " * indent << "\\begin{call}{#{call.p1.uid}}{#{SequenceDiagram.latex_escape(call.message)}}{#{call.p2.uid}}{#{SequenceDiagram.latex_escape(call.return)}}\n"
        open << :call
      end
    else
      s << " "* indent << "\\begin{messcall}{#{call.p1.uid}}{#{SequenceDiagram.latex_escape(call.message)}}{#{call.p2.uid}}\n"
      open << :messcall
    end
    indent += 1
  end

  while close = open.pop
    s << " " * indent << "\\end{#{close}}\n"
    indent -= 1
  end

  while prev_block_level > 0
    indent -= 1
    s << " " * indent << "\\end{sdblock}\n"
    prev_block_level -= 1
  end

  s << "\\end{sequencediagram}"
end