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https://issues.apache.org/jira/browse/NETBEANS-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pete Whelpton updated NETBEANS-2530:
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Labels: css performance (was: )
> Optimize GrammarParser.java in CSS Lib module
> ---------------------------------------------
>
> Key: NETBEANS-2530
> URL: https://issues.apache.org/jira/browse/NETBEANS-2530
> Project: NetBeans
> Issue Type: Improvement
> Components: web - CSS Editor
> Affects Versions: 11.0
> Reporter: Pete Whelpton
> Priority: Major
> Labels: css, performance
>
> Trying to bring the CSS module grammar (the .properties files in the CSS
> Editor module) up to date causes severe performance issues in NB due to the
> recursive nature of the parseElements() method of the GrammarParser class.
>
> 1) Recursive grammar (such as that of the calc() function in css) will cause
> a stack overflow as parseElements() will keep calling itself to resolve
> references until the stack is blown
> 2) Not using recursive grammar will still cause major performance issues will
> more than 1/2 levels of references, as memory gets eaten due to the
> parseElements() method not having a cache (e.g. it will call itself to try
> and resolve a reference it has already resolved previously, doing a lot of
> unnecessary work). In its current implementation it can blow the Java heap.
>
> I have grammar pretty much ready to go to implement CSS Values and Modules
> function in NB (e.g. proper implementation of calc(), min(), max(), attr()
> etc.), and have got 2) to be less of an issue by using a HashMap to cached
> reference properties so they don't get resolved again. Performance is still
> "stutery" at best - at NB memory still gets used up, but then reclaimed by
> the GC. Could really use some help properly optimizing this class.
>
> I think this should be fairly straightforward for somebody who knows what
> they are doing! I'd love to help bring CSS support up to date!
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