Flee is an expression parser and evaluator for the .NET framework. It allows you to compute the value of string expressions such as
sqrt(a^2 + b^2)
at runtime. It uses a custom compiler, strongly-typed expression language, and lightweight codegen to compile expressions directly to IL. This means that expression evaluation is extremely fast and efficient.
Try out the
, which lets you generate images based on expressions, and see for yourself.
- Fast and efficient expression evaluation
- Small, lightweight library
- Compiles expressions to IL using a custom compiler, lightweight codegen, and the DynamicMethod class
- Expressions (and the IL generated for them) are garbage-collected when no longer used
- Does not create any dynamic assemblies that stay in memory
- Backed by a comprehensive suite of unit tests
- Culture-sensitive decimal point
- Fine-grained control of what types an expression can use
- Supports all arithmetic operations including the power (^) operator
- Supports string, char, boolean, and floating-point literals
- Supports 32/64 bit, signed/unsigned, and hex integer literals
- Features a true conditional operator
- Supports short-circuited logical operations
- Supports arithmetic, comparison, implicit, and explicit overloaded operators
- Variables of any type can be dynamically defined and used in expressions
- CalculationEngine: Reference other expressions in an expression and recalculate in natural order
- Expressions can index arrays and collections, access fields and properties, and call functions on various types
- Generated IL can be saved to an assembly and viewed with a disassembler
Flee is licensed under the LGPL. This means that as long as you dynamically link (ie: add a reference) to the officially released assemblies, you can use it in commercial and non-commercial applications.