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

Inherits:
Object
  • Object
show all
Includes:
NFA::Dot
Defined in:
actionpack/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.



11
12
13
14
15
16
 
# File 'actionpack/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



9
10
11
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 9

def memos
  @memos
end

Instance Method Details

#[]=(from, to, sym) ⇒ Object 



111
112
113
114
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 111

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

#accepting?(state) ⇒ Boolean

Returns:

  • (Boolean) 


26
27
28
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 26

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

#accepting_states ⇒ Object 



22
23
24
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 22

def accepting_states
  @accepting.keys
end

#add_accepting(state) ⇒ Object 



18
19
20
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 18

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

#add_memo(idx, memo) ⇒ Object 



30
31
32
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 30

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

#as_json(options = nil) ⇒ Object 



46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 46

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 



38
39
40
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 38

def eclosure(t)
  Array(t)
end

#memo(idx) ⇒ Object 



34
35
36
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 34

def memo(idx)
  @memos[idx]
end

#move(t, a) ⇒ Object 



42
43
44
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 42

def move(t, a)
  move_string(t, a).concat(move_regexp(t, a))
end

#states ⇒ Object 



116
117
118
119
120
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 116

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

#to_svg ⇒ Object 



62
63
64
65
66
67
68
69
70
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 62

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 



122
123
124
125
126
127
128
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 122

def transitions
  @string_states.map { |from, hash|
    hash.map { |s, to| [from, s, to] }
  }.flatten(1) + @regexp_states.map { |from, hash|
    hash.map { |s, to| [from, s, to] }
  }.flatten(1)
end

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



72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
 
# File 'actionpack/lib/action_dispatch/journey/gtg/transition_table.rb', line 72

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.shuffle.first(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 }.shuffle.first
        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 for 1.9 warnings
  fun_routes  = fun_routes
  stylesheets = stylesheets
  svg         = svg
  javascripts = javascripts

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