https://ascend4.org/index.php?action=history&feed=atom&title=ANTLR_exercise 2026-04-28T23:10:41Z Revision history for this page on the wiki MediaWiki 1.43.6 https://ascend4.org/index.php?title=ANTLR_exercise&diff=158&oldid=prev 2010-05-13T14:00:04Z

<p>Restored page from Google Cache, uploaded by John Pye</p> <p><b>New page</b></p><div>ANTLR is a candidate for replacing yacc/lex as the parser in ascend. This is needed for many reasons, of which a key one is generating C-code versions of models that are thread safe so we don&#039;t have to clean up the current model interpreter. There are several other very good reasons for ANTLR:<br /> <br /> <br /> * We want to do source-to-source translation of ascend models to other languages that give us optimization access (GAMS, AMPL, OSxL, Matlab).<br /> * Similarly, we want to be able to dump a canned C or Fortran version of a model for standalone (non-ascend) use.<br /> <br /> The exercise is to demonstrate just the parsing with antlr of the current ascend language, with particular attention to the portions of the language defined in compiler/scanner.l (the lex/flex input file).<br /> <br /> The current parser/scanner are in compiler/ascParse.y and compiler/scanner.l.<br /> <br /> Notable differences between ascend and other languages are the NOTES feature of ascend and the fact that comments in ascend nest, unlike C/Java.<br /> <br /> Building ascend and installing Antlrworks is probably a good place to start.<br /> <br /> <br /> <br /> <br /> [[Category:GSOC2010]]</div>

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