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deprecated_settings [2021/12/21 13:56]
revusky |
deprecated_settings [2021/12/21 14:03] (current)
revusky |
| * **BUILD_PARSER**: Another bizarrely pointless setting really. If all you want to do is build a lexer, and not a parser, then just don't define any grammatical productions in your grammar and all we build is a lexer! | * **BUILD_PARSER**: Another bizarrely pointless setting really. If all you want to do is build a lexer, and not a parser, then just don't define any grammatical productions in your grammar and all we build is a lexer! |
| * **DEBUG_LEXER**: This setting, along with ''DEBUG_PARSER'' are removed as of mid-December 2021. It is very hard to imagine current-day developers using this sort of approach, as opposed to using an actual debugger! | * **DEBUG_LEXER**: This setting, along with ''DEBUG_PARSER'' are removed as of mid-December 2021. It is very hard to imagine current-day developers using this sort of approach, as opposed to using an actual debugger! |
| * **DEBUG_PARSER**: This is now gone. It is actually not so hard to debug the generated parser since the code is much more readable than before and contains location info to trace back where in the grammar file the code was generated from. | * **DEBUG_PARSER**: This is now gone. It is actually not so hard to debug the generated parser since the code is much more readable than before and contains location info to trace back where in the grammar file the generated code originated. |
| * **KEEP_LINE_COL**: JavaCC21 always puts location information in Tokens and Node objects. (//Really, why would you ever want to throw away location info?//) For more thoughts on this issue, see [[https://javacc.com/2020/05/05/gigabyte-is-the-new-megabyte/|The Gigabyte is the new Megabyte]]. | * **KEEP_LINE_COL**: JavaCC21 always puts location information in Tokens and Node objects. (//Really, why would you ever want to throw away location info?//) For more thoughts on this issue, see [[https://javacc.com/2020/05/05/gigabyte-is-the-new-megabyte/|The Gigabyte is the new Megabyte]]. |
| * **ERROR_REPORTING**: This was an option that was true by default, but you could turn it off in order to generate a somewhat smaller .class file, except that error messages would be much less informative because of information being thrown away. I did some experimenting and found that the generated XXXParser.class was typically about 10% smaller with ERROR_REPORTING off. The tradeoff looks terrible and, as with KEEP_LINE_COL, it looks utterly foolish to ever turn this off. So, the setting is now gone and the option is always effectively on. (Further note. All the legacy error reporting code is practically rewritten anyway. The prior comment applies in any case. There is no reason for any sane person to want to turn it off.) | * **ERROR_REPORTING**: This was an option that was true by default, but you could turn it off in order to generate a somewhat smaller .class file, except that error messages would be much less informative because of information being thrown away. I did some experimenting and found that the generated XXXParser.class was typically about 10% smaller with ERROR_REPORTING off. The tradeoff looks terrible and, as with KEEP_LINE_COL, it looks utterly foolish to ever turn this off. So, the setting is now gone and the option is always effectively on. (Further note. All the legacy error reporting code is practically rewritten anyway. The prior comment applies in any case. There is no reason for any sane person to want to turn it off.) |
