Module: Ruote::Exp::Condition

Defined in:
lib/ruote/exp/condition.rb

Overview

A few helper methods for evaluating :if and :unless expression attributes in process definitions.

Defined Under Namespace

Classes: ConditionError

Constant Summary collapse

REGEXES = 
{
  'evl_set' => /^(.+?)( +is)?( +not)?( +set)$/,
  'evl_null' => /^(.+?)( +is)?( +not)?( +null)$/,
  'evl_empty' => /^(.+[\]}"'])( +is)?( +not)?( +empty)$/,
  'evl_in' => /^(.+?)( +is)?( +not)?( +in +)(\[.*\]|\{.*\})$/
}

Class Method Summary collapse

Class Method Details

.apply?(sif, sunless) ⇒ Boolean

Returns:

  • (Boolean) 


53
54
55
56
57
58
59
 
# File 'lib/ruote/exp/condition.rb', line 53

def self.apply?(sif, sunless)

  return (true?(sif)) if sif
  return ( ! true?(sunless)) if sunless

  true
end

.eval(code) ⇒ Object

Evaluates the given [conditional] code string and returns the result.

Note : this is not a full Ruby evaluation !



85
86
87
88
89
90
91
92
 
# File 'lib/ruote/exp/condition.rb', line 85

def self.eval(code)

  evl(code)

rescue ArgumentError => ae

  raise ConditionError.new(code)
end

.true?(conditional) ⇒ Boolean

Returns true if the given conditional string evaluates to true.

Returns:

  • (Boolean) 


63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/ruote/exp/condition.rb', line 63

def self.true?(conditional)

  conditional = unescape(conditional.to_s)

  REGEXES.each do |method, regex|
    if m = regex.match(conditional)
      return self.send(method, m)
    end
  end

  evl(conditional) ? true : false

rescue ArgumentError => ae

  raise ConditionError.new(conditional)
end