Class: Bindy::Context

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(variables = {}) ⇒ Context

Returns a new instance of Context.



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# File 'lib/bindy/context.rb', line 7

def initialize(variables={})
  @variables = variables
end

Instance Attribute Details

#variables ⇒ Object (readonly)

Returns the value of attribute variables.



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# File 'lib/bindy/context.rb', line 5

def variables
  @variables
end

Instance Method Details

#evaluate(expression) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/bindy/context.rb', line 11

def evaluate(expression)
  raise ArgumentError, "Expression must be a string (#{expression})" unless expression.kind_of?(String)
  Language.parse(expression).evaluate(self)
end

#var(name) ⇒ Object 



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# File 'lib/bindy/context.rb', line 16

def var(name)
  name.split('.').inject(variables) do |vars, key| 
    vars.fetch(key) { vars.fetch(key.to_sym) }
  end
rescue KeyError
  raise ArgumentError, "Undefined variable #{name}"
end