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De (Dynamic Expression) module provides means to build and evaluate dynamic expression of arbitrary complecity and operands/operators nature. Expression is considered as tree consisted of operands and operators. Operater must have child nodes. Operand is terminal node. Tree example: (a + b) * c + d - + --- * ----- + ------- a ------- b ----- c --- d Here "+" and "*" are operators, "a", "b", "c" and "d" are operands Expression tree structure is built with the help of <rubytree> gem (https://rubygems.org/gems/rubytree) In addition to basic classes of Expression, Operand and Operator module provides some extensions for different nature expressions: - Boolean expressions - Sunspot Solr search expressions