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Contents
module Unitwise
module Expression
class Decomposer
METHODS = [:primary_code, :secondary_code, :names, :slugs, :symbol]
PARSERS = METHODS.reduce({}) do |hash, method|
hash[method] = Parser.new(method); hash
end
TRANSFORMER = Transformer.new
attr_reader :expression
def initialize(expression)
@expression = expression.to_s
if terms.nil? || terms.empty?
raise ExpressionError, "Could not evaluate '#{@expression}'."
end
end
def transform
PARSERS.reduce(nil) do |foo, (method, parser)|
if parsed = parser.parse(expression) rescue next
return TRANSFORMER.apply(parsed, key: method)
end
end
end
def terms
@terms ||= begin
transformation = transform
if transformation.respond_to?(:terms)
transformation.terms
else
Array(transformation)
end
end
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems