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Project Description

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.

Features

• 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

More information

• Examples to learn how to create and evaluate expressions.