Lapg is the combined lexical analyzer and parser generator, which converts a description for a context-free LALR grammar into source file to parse the grammar. Generates code for Java, Javascript, C, C++ and C#.
A Java library for parsing files and building Abstract Syntax Tree based on context free (CF) grammar.
Easy to use and provides fast prototyping. With grammar provided the library provides the AST of input. Command line interface is provided.
HiLexed 2 is a dynamic hierarchical LL-parser system with integrated lexing. It features a powerful unlimited look-ahead, look-ahead compression*, dynamic rules and left-recursion*. * = Under development
More Than Parsing is a parser generator for context free grammars defined in a BNF-like format. It generates scanners, parsers, ASTs, etc. This sf project is no longer active, development will continue in a different place.
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JFormulaEngine is a formula engine that runs spreadsheet-style formulas in any context. The function library is fully extensible and the engine can resolve variable names to any context, such as a CMS or spreadsheet, that is supported by JFormulaEngine.
...Closely follows BNF syntax. Optimized for performance and low overhead. Highly flexible and extendable using a streamlined API. Integrate semantics, tracing and even context sensitive parsers.