Class: ActionDispatch::Journey::GTG::TransitionTable

Inherits:
Object
  • Object
show all
Includes:
NFA::Dot
Defined in:
lib/action_dispatch/journey/gtg/transition_table.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from NFA::Dot

#to_dot

Constructor Details

#initialize ⇒ TransitionTable

Returns a new instance of TransitionTable.



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 11

def initialize
  @regexp_states = {}
  @string_states = {}
  @accepting     = {}
  @memos         = Hash.new { |h,k| h[k] = [] }
end

Instance Attribute Details

#memos ⇒ Object (readonly)

Returns the value of attribute memos.



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 9

def memos
  @memos
end

Instance Method Details

#[]=(from, to, sym) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 123

def []=(from, to, sym)
  to_mappings = states_hash_for(sym)[from] ||= {}
  to_mappings[sym] = to
end

#accepting?(state) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 26

def accepting?(state)
  @accepting[state]
end

#accepting_states ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 22

def accepting_states
  @accepting.keys
end

#add_accepting(state) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 18

def add_accepting(state)
  @accepting[state] = true
end

#add_memo(idx, memo) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 30

def add_memo(idx, memo)
  @memos[idx] << memo
end

#as_json(options = nil) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 58

def as_json(options = nil)
  simple_regexp = Hash.new { |h,k| h[k] = {} }

  @regexp_states.each do |from, hash|
    hash.each do |re, to|
      simple_regexp[from][re.source] = to
    end
  end

  {
    regexp_states: simple_regexp,
    string_states: @string_states,
    accepting:     @accepting
  }
end

#eclosure(t) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 38

def eclosure(t)
  Array(t)
end

#memo(idx) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 34

def memo(idx)
  @memos[idx]
end

#move(t, a) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 42

def move(t, a)
  return [] if t.empty?

  regexps = []

  t.map { |s|
    if states = @regexp_states[s]
      regexps.concat states.map { |re, v| re === a ? v : nil }
    end

    if states = @string_states[s]
      states[a]
    end
  }.compact.concat regexps
end

#states ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 128

def states
  ss = @string_states.keys + @string_states.values.flat_map(&:values)
  rs = @regexp_states.keys + @regexp_states.values.flat_map(&:values)
  (ss + rs).uniq
end

#to_svg ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 74

def to_svg
  svg = IO.popen('dot -Tsvg', 'w+') { |f|
    f.write(to_dot)
    f.close_write
    f.readlines
  }
  3.times { svg.shift }
  svg.join.sub(/width="[^"]*"/, '').sub(/height="[^"]*"/, '')
end

#transitions ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 134

def transitions
  @string_states.flat_map { |from, hash|
    hash.map { |s, to| [from, s, to] }
  } + @regexp_states.flat_map { |from, hash|
    hash.map { |s, to| [from, s, to] }
  }
end

#visualizer(paths, title = 'FSM') ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/transition_table.rb', line 84

def visualizer(paths, title = 'FSM')
  viz_dir   = File.join File.dirname(__FILE__), '..', 'visualizer'
  fsm_js    = File.read File.join(viz_dir, 'fsm.js')
  fsm_css   = File.read File.join(viz_dir, 'fsm.css')
  erb       = File.read File.join(viz_dir, 'index.html.erb')
  states    = "function tt() { return #{to_json}; }"

  fun_routes = paths.sample(3).map do |ast|
    ast.map { |n|
      case n
      when Nodes::Symbol
        case n.left
        when ':id' then rand(100).to_s
        when ':format' then %w{ xml json }.sample
        else
          'omg'
        end
      when Nodes::Terminal then n.symbol
      else
        nil
      end
    }.compact.join
  end

  stylesheets = [fsm_css]
  svg         = to_svg
  javascripts = [states, fsm_js]

  # Annoying hack warnings
  fun_routes  = fun_routes
  stylesheets = stylesheets
  svg         = svg
  javascripts = javascripts

  require 'erb'
  template = ERB.new erb
  template.result(binding)
end