Ibpag2 Icon-Based Parser Generation System 2 Ibpag2 is a parser generator for Icon by Richard L. Goerwitz . It does most of what you would expect. Latest version can handle both SLR1 grammars and even GLR grammars (Tomita grammars). Ibpag2 runs under Unix. Version: 1.0 (beta). Posted to comp.sources.misc. (1993-07-13) Source: The Free On-line Dictionary of Computing.