Class: GhostWheel::Expression::Transform

Inherits:
GhostWheel::Expression show all
Defined in:
lib/ghost_wheel/expression/transform.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from GhostWheel::Expression

#parse

Constructor Details

#initialize(expression, &transformer) ⇒ Transform

Returns a new instance of Transform.



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# File 'lib/ghost_wheel/expression/transform.rb', line 6

def initialize(expression, &transformer)
  @expression  = expression
  @transformer = transformer
end

Instance Attribute Details

#expression ⇒ Object (readonly)

Returns the value of attribute expression.



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# File 'lib/ghost_wheel/expression/transform.rb', line 11

def expression
  @expression
end

#transformer ⇒ Object (readonly)

Returns the value of attribute transformer.



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# File 'lib/ghost_wheel/expression/transform.rb', line 11

def transformer
  @transformer
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/ghost_wheel/expression/transform.rb', line 23

def ==(other)
  super                            and
  @expression  == other.expression and
  @transformer == other.transformer
end

#uncached_parse(scanner, cache) ⇒ Object 



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# File 'lib/ghost_wheel/expression/transform.rb', line 13

def uncached_parse(scanner, cache)
  result = @expression.parse(scanner, cache)
  if result.is_a? FailedParseResult
    result
  else
    value = result.is_a?(ParseResult) ? result.value : result
    ParseResult.new(@transformer[value])
  end
end