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benfry

opened on Jan 22, 2015

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Our current grammar is out of date and doesn't support many newer Java features. See also #3055.

Reacted by Raphael Schweikert

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1. benfry

   added

   enhancement

   help wantedWe have very little time and would like some helpWe have very little time and would like some help

   on Jan 22, 2015
2. joelmoniz commented on Mar 23, 2015

   

   joelmoniz

   on Mar 23, 2015

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   @benfry I'd like to help out with this. Could you please let me know which features are missing/out-of-date at present? Here are a few missing ones that I have identified, although I'm not quite sure about how relevant/important they may be:

   1. Multi-catch support
   2. Support for the diamond operator
   3. Underscores in numeric literals (such as int x = 30_000)
   4. Strings in switch
   5. Binary literals
   6. Support for lambda calculus

   Thanks
3. benfry commented on Mar 24, 2015

   

   benfry

   on Mar 24, 2015

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   Thanks for the interest. This is less about adding the language features one by one than it is finding an existing Java 1.8 grammar for ANTLR and making it work. This would be best handled by fixing #3055 first, and then going after this issue.
4. miguel-negrao commented on Jul 12, 2016

   

   miguel-negrao

   on Jul 12, 2016

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   Support for lambda calculus

   Lambda calculus is an abstract mathematical entity: "Lambda calculus (also written as λ-calculus) is a formal system in mathematical logic for expressing computation based on function abstraction and application using variable binding and substitution.". You probably mean lambda expressions.

   Reacted by David Merrick
5. cansik commented on Nov 26, 2016

   

   cansik

   on Nov 26, 2016

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   Is someone working on this issue or on #3055 at the moment? There is an existing grammar for ANTLR: https://github.com/antlr/grammars-v4/blob/master/java8/Java8.g4

   It would be great to be able to write lambda expression.
6. kevinkyyro commented on Nov 26, 2016

   

   kevinkyyro

   on Nov 26, 2016

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   I'm not actively working on it, but I've looked at it a bit and it seems tricky.

   It looks like the currently used java 5 grammar is not a vanilla; I don't know ANTLR so it's difficult to try to tease out the modifications and then migrate them to ANTLR 4 since I couldn't find migration guides from ANTLR 2 to 3 and 3 to 4 (found one but not the other).

   I wonder if it would make sense to migrate to a code or script-based preprocessor translating from processing syntax to valid java 5, then piping that through ANTLR with the vanilla java 5 grammar. It seems like it would make it easier to drop in the java 8 grammar, ideally without modification. This is based on the assumption that the preprocessor would be relatively simple; most of the modifications seem context-independent -- mainly just globals and type aliases, though type I guess type coercion could need a little more care if type aliasing is not sufficient.
7. sampottinger commented on Mar 27, 2019

   

   sampottinger

   on Mar 27, 2019

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   Hey there! Just to keep some threads updated... I revisited #3055, bringing it up to speed with processing's current master and #5753. I have a build of processing working (with a few particular error handlers being migrated) at sampottinger#15. I'll redirect that from my fork to this repo after #5753 is concluded.
8. sampottinger commented on Apr 9, 2019

   

   sampottinger

   on Apr 9, 2019

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   Hey there! Just a quick update for those tracking this thread. sampottinger#15 is stable and ready for feedback. I recommend testing using my master at https://github.com/sampottinger/processing. It has all of the PRs that branch off of #5753 merged in.

   Unfortunately #5753 is still under review so there is likely a little runway on my fork but hoping to rejoin mainline soon.
9. sampottinger

   added 2 commits that reference this issue on Oct 6, 2019

   Move to ANTLR 4 with Java 11 lang features and localization.

   cbfa4b3

   Move to ANTLR 4 with Java 11 lang features and localization. (#5)

   ee299ef
10. benfry commented on Jan 17, 2020

    

    benfry

    on Jan 17, 2020

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    Resolved in the 4.x series: https://github.com/processing/processing4
11. benfry

    closed this as completedon Jan 17, 2020
12. processing

    locked as resolved and limited conversation to collaborators on Jan 17, 2020

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