Class: UnifiedMatchers::UnifiedMatcher::Rule

Inherits:
Object
  • Object
show all
Defined in:
lib/unified_matchers/unified_matcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(matcher, name, *args, &block) ⇒ Rule

Returns a new instance of Rule.



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# File 'lib/unified_matchers/unified_matcher.rb', line 40

def initialize matcher, name, *args, &block
  unless name.is_a? Symbol
    raise ArgumentError, "The name must be a symbol, not: #{name}"
  end
  @name = name
  @conditions = {}
  @message = nil
  @pos = 0
  for arg in args.flatten do
    setup_arg arg, matcher
  end
  if @conditions.empty?
    @conditions[:respond_to] = @name
  end
  case @pos
  when 0
    update_order name, matcher.last_defined_rule, 1, matcher #after
  when 1
  else raise ArgumentError,
          "Don't define more than one position (:before or :after)"
  end
  if block.nil?
    meth = @conditions[:respond_to]
    @block = lambda { |x| x.send meth }
    @message ||= "%x.#{meth}"
  else
    @block = block
    @message ||= "%x.<rule #@name>"
  end
  matcher.last_defined_rule = name
  matcher.rules = {@name => self}
end

Instance Attribute Details

#message ⇒ Object (readonly)

Returns the value of attribute message.



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# File 'lib/unified_matchers/unified_matcher.rb', line 38

def message
  @message
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/unified_matchers/unified_matcher.rb', line 38

def name
  @name
end

Instance Method Details

#activable?(anObject) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/unified_matchers/unified_matcher.rb', line 109

def activable? anObject
  activable_rec @conditions, anObject
end

#activable_rec(condition, anObject) ⇒ Object 



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# File 'lib/unified_matchers/unified_matcher.rb', line 113

def activable_rec condition, anObject
  case condition
  when Class then anObject.is_a? condition
  when Symbol then anObject.respond_to? condition
  when Hash
    if condition.size != 1
      raise ArgumentError, "Too much conditions, use :all or :any to" +
      "combine them. (rule: #{name})"
    end
    k,v = condition.to_a.first
    case k
    when :is_a then anObject.is_a? v
    when :respond_to then anObject.respond_to? v
    when :all then v.all? { |x| activable_rec x, anObject }
    when :any then v.any? { |x| activable_rec x, anObject }
    else raise ArgumentError, "Bad key: #{k}"
    end
  else raise ArgumentError, "Bad condition: #{condition}"
  end
end

#activate(x) ⇒ Object 



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# File 'lib/unified_matchers/unified_matcher.rb', line 134

def activate x
  case @block.arity
  when -1 then x.instance_eval(&@block)
  when  1 then @block[x]
  else raise ArgumentError, "Bad block arity: #{@block.arity}"
  end
end

#update_order(new, ref, offset, m) ⇒ Object 



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# File 'lib/unified_matchers/unified_matcher.rb', line 95

def update_order new, ref, offset, m
  m.order = m.order - [new]
  i = m.order.index ref
  if i.nil?
    if m.last_defined_rule.nil?
      m.order = [new]
    else
      raise ArgumentError, "Undefined rule: #{ref}"
    end
  else
    m.order = m.order[0..i-1+offset] + [new] + m.order[i+offset..-1]
  end
end