Class: MountainBerryFields::Evaluator

Inherits:
Object
  • Object
show all
Defined in:
lib/mountain_berry_fields/evaluator.rb

Overview

This class evaluates a block of code that was emitted from the parser. It has a document that the evalutable code can append to. It implements the visible and invisible methods (see the parser for more on these) that MountainBerryFields supports.

It also evaluates tests, and tracks whether they pass or fail (currently only tracking the last failure)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(to_evaluate) ⇒ Evaluator

Returns a new instance of Evaluator.



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# File 'lib/mountain_berry_fields/evaluator.rb', line 14

def initialize(to_evaluate)
  @to_evaluate = to_evaluate
end

Instance Attribute Details

#to_evaluate ⇒ Object (readonly)

Returns the value of attribute to_evaluate.



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# File 'lib/mountain_berry_fields/evaluator.rb', line 12

def to_evaluate
  @to_evaluate
end

Class Method Details

.invisible_commands ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 22

def self.invisible_commands
  [:setup, :context]
end

.visible_commands ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 18

def self.visible_commands
  [:test]
end

Instance Method Details

#context(context_name, options = {}, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/mountain_berry_fields/evaluator.rb', line 30

def context(context_name, options={}, &block)
  contexts[context_name] = in_context options[:context], block.call
  return if contexts[context_name]['__CODE__']
  raise ArgumentError, "Context #{context_name.inspect} does not have a __CODE__ block"
end

#contexts ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 36

def contexts
  @contexts ||= Hash.new
end

#document ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 79

def document
  evaluate
  @document ||= ''
end

#evaluate ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 84

def evaluate
  return if @evaluated
  @evaluated = true
  instance_eval to_evaluate
end

#failure_message ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 71

def failure_message
  @failing_strategy.failure_message
end

#failure_name ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 67

def failure_name
  @failing_test.name
end

#in_context(context_name, code) ⇒ Object

Raises:

  • (NameError) 


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# File 'lib/mountain_berry_fields/evaluator.rb', line 56

def in_context(context_name, code)
  return code unless context_name
  return contexts[context_name].gsub '__CODE__', code if contexts[context_name]
  raise NameError, "There is no context #{context_name.inspect}, only #{contexts.keys.inspect}"
end

#setup ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 26

def setup
  setup_code << yield
end

#setup_code ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 40

def setup_code
  @setup_code ||= ''
end

#test(name, options = {}, &block) ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 44

def test(name, options={}, &block)
  code = setup_code + in_context(options[:context], block.call.to_s)
  test = Test.new(name, options.merge(code: code))
  strategy = Test::Strategy.for(test.strategy).new(test.code)
  unless strategy.pass?
    @failing_strategy = strategy
    @failing_test     = test
  end
  tests << test
end

#tests ⇒ Object 



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# File 'lib/mountain_berry_fields/evaluator.rb', line 75

def tests
  @tests ||= []
end

#tests_pass? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mountain_berry_fields/evaluator.rb', line 62

def tests_pass?
  evaluate
  !@failing_test
end