Class: Unitwise::Expression::Decomposer

Inherits:
Object
  • Object
show all
Defined in:
lib/unitwise/expression/decomposer.rb

Constant Summary collapse

PARSERS = 
[:primary_code, :secondary_code, :names, :slugs, :symbol].map do |t|
  Parser.new(t)
end
TRANSFORMER = 
Transformer.new

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expression) ⇒ Decomposer 



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# File 'lib/unitwise/expression/decomposer.rb', line 13

def initialize(expression)
  @expression = expression.to_s
  if terms.nil? || terms.empty?
    raise ExpressionError, "Could not evaluate '#{@expression}'."
  end
end

Instance Attribute Details

#expression ⇒ Object (readonly)

Returns the value of attribute expression.



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# File 'lib/unitwise/expression/decomposer.rb', line 11

def expression
  @expression
end

Instance Method Details

#parse ⇒ Object 



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# File 'lib/unitwise/expression/decomposer.rb', line 20

def parse
  PARSERS.reduce(nil) do |m, p|
    if prs = p.parse(expression) rescue next
      return prs
    end
  end
end

#terms ⇒ Object 



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# File 'lib/unitwise/expression/decomposer.rb', line 32

def terms
  if transform.respond_to?(:terms)
    transform.terms
  else
    Array(transform)
  end
end

#transform ⇒ Object 



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# File 'lib/unitwise/expression/decomposer.rb', line 28

def transform
  @transform ||= TRANSFORMER.apply(parse)
end