Crate expression_engine

Expression engine is a library written in pure Rust which provides an engine to compile and execute expressions. An expression indicates a string-like sentence that can be executed with some contexts and return a value (mostly, but not limited to, boolean, string and number). Expression engine aims to provide an engine for users that can execute complex logics using configurations without recompiling. It’s a proper alternative as the basis to build business rule engines.

Features

• Easy to Use (three lines at least)
• Abundant Types and Expressions (Five fundamental types and seven kinds of expressions)
• Pre-defined Operators Support (Common boolean, numeric and string operators)
• Support function and operators registration
• Support operator redirection

Macros

• create_context

Functions

• execute
  Usage

Type Definitions

• Context
• Value