Class: Predicator::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/predicator/context.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attrs = {}) ⇒ Context 



7
8
9
10
 
# File 'lib/predicator/context.rb', line 7

def initialize attrs={}
  @bindings = {}
  attrs.each{ |key, val| bind key, val }
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object 



39
40
41
42
43
44
45
46
 
# File 'lib/predicator/context.rb', line 39

def method_missing method, *args, &block
  found_binding = bindings.fetch method.to_s, nil
  if found_binding.nil?
    super
  else
    found_binding
  end
end

Instance Attribute Details

#bindings ⇒ Object (readonly)

Returns the value of attribute bindings.



5
6
7
 
# File 'lib/predicator/context.rb', line 5

def bindings
  @bindings
end

Instance Method Details

#bind(name, obj) ⇒ Object Also known as: []= 



12
13
14
15
16
17
 
# File 'lib/predicator/context.rb', line 12

def bind name, obj
  if obj.kind_of? Hash
    obj = OpenStruct.new obj
  end
  bindings[name.to_s] = obj
end

#eval(string) ⇒ Object 



48
49
50
51
52
53
54
 
# File 'lib/predicator/context.rb', line 48

def eval string
  string.gsub(/{{([^}]+)}}/) do |match|
    name, attribute = $1.strip.split "."
    variable = Predicator::Variable.new name, attribute
    value_for variable
  end
end

#node_for(input) ⇒ Object 



20
21
22
23
24
 
# File 'lib/predicator/context.rb', line 20

def node_for input
  value = value_for input
  node_class = Predicator::Nodes::BaseNode.class_for value
  node_class.new value
end

#respond_to?(method) ⇒ Boolean 



35
36
37
 
# File 'lib/predicator/context.rb', line 35

def respond_to? method
  bindings.key?(method.to_s) || super
end

#to_hash ⇒ Object 



56
57
58
59
60
61
62
 
# File 'lib/predicator/context.rb', line 56

def to_hash
  hsh = {}
  bindings.each do |key, value|
    hsh[key] = hash_value_for value
  end
  hsh
end

#value_for(input) ⇒ Object Also known as: [] 



26
27
28
29
30
31
32
 
# File 'lib/predicator/context.rb', line 26

def value_for input
  if input.kind_of? Predicator::Variable
    input.value_in self
  else
    input
  end
end