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<TO DO>
Expression4j is a simple framework. It is splited into 3 part:
- the expression model
- the expression parser.
- the catalog
- and parameters
This three components are regrouped into one factory (ExpressionFactory)
Expression parser analyse the expression and construct the associated tree representation.
Catalog store all necessary expression used to evaluate an expression.
Parameters are used to give value on each parameter of an expression.
The NumberFactory is used to generate mathematical element like real, complex ...
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