cgb-lowcode/javacc-perf-diag

javacc-perf-diag

JavaCC is a very good parser generator. But it contains tools used at the wrong places results in very inperformant parsers. This project aims to deliver some statistic identifiying those hotspots of a parser.

The tool uses AspectJ to link into an existing parser. The logging possibilities of JavaCC are not used.

Some statistics were delivered combining some values of a real parsing process. Mainly you are able to identify the productions with the most complex lookahead. Excessive lookaheads are one of the main reasons to produce poor parser performance.

Example JSqlParser

The motivation developing this project were some very inperformant parsing processes of JSqlParser.