Class: Markdoc::Sequence::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/markdoc/sequence.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source, options = {}) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/markdoc/sequence.rb', line 89

def initialize(source, options = {})
  self.source = source
  self.output = []
  self.roles = []
  self.messages = []
  self.variables = defaults.dup
  options.each do |key, value|
    variables[key] = value
  end
end

Instance Attribute Details

#messages ⇒ Object

Returns the value of attribute messages.



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# File 'lib/markdoc/sequence.rb', line 73

def messages
  @messages
end

#output ⇒ Object

Returns the value of attribute output.



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# File 'lib/markdoc/sequence.rb', line 73

def output
  @output
end

#roles ⇒ Object

Returns the value of attribute roles.



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# File 'lib/markdoc/sequence.rb', line 73

def roles
  @roles
end

#source ⇒ Object

Returns the value of attribute source.



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# File 'lib/markdoc/sequence.rb', line 73

def source
  @source
end

#variables ⇒ Object

Returns the value of attribute variables.



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# File 'lib/markdoc/sequence.rb', line 73

def variables
  @variables
end

Instance Method Details

#defaults ⇒ Object 



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# File 'lib/markdoc/sequence.rb', line 75

def defaults
  {
    boxht:     '0.5', # Object box height
    boxwid:    '1.3', # Object box width
    awid:      '0.1', # Active lifeline width
    spacing:   '0.25', # Spacing between messages
    movewid:   '0.75', # Spacing between objects
    dashwid:   '0.05', # Interval for dashed lines
    maxpswid:  '20', # Maximum width of picture
    maxpsht:   '20', # Maximum height of picture
    underline: '0', # Underline the name of objects
  }
end

#find(id) ⇒ Object 



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# File 'lib/markdoc/sequence.rb', line 100

def find(id)
  id.strip!
  roles.detect{|role| role.id == id}
end

#footer ⇒ Object 



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# File 'lib/markdoc/sequence.rb', line 199

def footer
  output << ''
  output << 'step();'
  output << '# Complete the lifelines'
  roles.each do |object|
    output << "complete(#{object.id});"
  end
  output << ''
  output << '.PE'
end

#header ⇒ Object 



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# File 'lib/markdoc/sequence.rb', line 174

def header
  headers = []
  headers << '.PS'
  headers << ''
  headers << macros
  headers << ''
  headers << '# Variables'
  # calculate height

  variables[:maxpsht] = ((variables[:spacing].to_f *
                          messages.map(&:height).reduce(:+)) +
                         variables[:boxht].to_f).ceil

  variables.each do |key, value|
    headers << "#{key} = #{value};"
  end
  headers << '# Actors and Objects'
  roles.each do |object|
    headers << %Q[#{object.type}(#{object.id},"#{object.label}");]
  end
  headers << 'step();'
  headers << ''
  self.output =  headers + output
end

#macros ⇒ Object 



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# File 'lib/markdoc/sequence.rb', line 170

def macros
  IO.read File.join(File.dirname(__FILE__), 'sequence.pic')
end

#parse ⇒ Object 



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# File 'lib/markdoc/sequence.rb', line 105

def parse
  source.split("\n").each do |line|
    next if line.strip.empty?
    if match = line.match(/^([a-zA-Z0-9_ \t]+) *= *([a-zA-Z0-9_ \t]+)/)
      if match[2] =~ /Actor/
        roles << Role.new(:actor, match[1].strip, match[1].strip)
      else
        roles << Role.new(:object, match[1].strip, match[2].strip)
      end
    elsif match = line.match(/^([a-zA-Z0-9_ \t]+) *([<\-~>]{2}) *([a-zA-Z0-9_ \t]+):([^#]+)#?(.*)/)
      role1, role2, op = find(match[1]), find(match[3]), match[2]

      if op.index('>')
        source, dest = role1, role2
      elsif op.index('<')
        source, dest = role2, role1
      else
        raise "Message direction must be one of ->, ~>, <-, <~"
      end

      if op.index('-')
        type = :message
      elsif op.index('~')
        type = :rmessage
      else
        raise "Message direction must be one of ->, ~>, <-, <~"
      end

      message = Message.new(type, source, dest, match[4], match[5])
      # deactivate prev messages roles
      if last = messages.last
        (last.roles - message.roles).each do |role|
          output << role.deactivate if role.active
        end
      end
      # activate source before send message
      output << source.activate unless source.active
      output << message.deliver
      output << message.describe
      # activate dest
      output << dest.activate unless dest.active
      messages << message
    elsif match = line.match(/^([a-zA-Z0-9_ \t]+) *:([^#]+)#?(.*)/)
      role = find(match[1])
      message = Message.new(:message, role, role, match[2], match[3])
      # deactivate prev messages roles
      if last = messages.last
        (last.roles - message.roles).each do |role|
          output << role.deactivate if role.active
        end
      end
      # activate role before send message
      output << role.activate unless role.active
      output << message.deliver
      output << message.describe
      messages << message
    end
  end

  header
  footer

  output.compact.join("\n")
end