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    New Lua enhancements

    SinisterSoftSinisterSoft Maintainer
    edited October 2017 in Code snippets
    I've added a multi-dimensional array indexing with comma syntax patch by Mark Fieldman.

    It modifies the parser to support multi-dimensional array indexing with comma syntax, i.e. m[1,2] is treated by the parser as being identical to m[1][2], thus allowing for code such as the following:
    m = {[1]={}, [2]="foo"}
m[1,2] = "bar"
print(m[2], m[1][2], m[1,2])  --> foo  bar bar
m.foo = {}
m.foo.bar = "baz"
print(m["foo","bar"])         --> baz
    I've also added some mutation operators:

    += add
    -= sub
    *= mult
    /= div
    %= mod
    ^= power
    a=4
a+=1 -- a is now 5
a^=2 -- a is now 25
    These will save a lot of typing and should be faster because the source variable only needs to be looked up once.

    Likes: antix, Atavismus, keszegh, EricCarr

    Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
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    Comments

    • totebototebo Member
      This is neat. The operators need documenting too.becausr they're not standard? I always missed the ++ opertator personally, not sure if that can be added though. :)

      Likes: antix, Atavismus

      My Gideros games: www.totebo.com
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    • SinisterSoftSinisterSoft Maintainer
      It could be added, it's the same as +=1 though, would we then also have to add -- ?

      Besides, we have limited operator space I think (to fit in the bytecode), possibly right at the end.
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • SinisterSoftSinisterSoft Maintainer
      edited October 2017
      The array stuff is good, you could load something like:
      map={{1,2,3},{4,5,6},{7,8,9}}
print(map[2,3])  -- would print 6
 
map[2,3]=12
print(map[2,3])
      rather than
      map[2][3]=12
print(map[2][3])
      Much easier for beginners and less typing.

      Likes: jdbc

      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • SinisterSoftSinisterSoft Maintainer
      Note: The mutation operators do a single assign, not multiple, so:
      a,b,c=1,2,3
a+=1
b+=1
c+=1
      will work, but this won't:
      a,b,c=1,2,3
a,b,c+=1,1,1
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • antixantix Member
      Fantastico!

      Likes: SinisterSoft

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    • SinisterSoftSinisterSoft Maintainer
      It should hopefully be in the next version (very soon). I've uploaded the changes to the repo for @hgy29. :)
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • SinisterSoftSinisterSoft Maintainer
      Even things like this will save a cycle or two:
      a+=b
      is the same as
      a=a+b
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • john26john26 Maintainer
      Can't do -- as it is a lua comment. Hence ++ doesn't make sense either

      Likes: antix, SinisterSoft

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    • totebototebo Member
      Yhaaarwh. Farewell my incremental ++ beauty.
      My Gideros games: www.totebo.com
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    • SinisterSoftSinisterSoft Maintainer
      One more thing to note:

      As you would expect, the right hand side of the operation is evaluated first, so:
      a=4
a*=4+1
print(a)
      will result in 20 being printed, not 17.
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • YanYan Member
      edited November 2017
      What kind of enhancement is this ? Is this lua module ? Or this is only for Gideros ? I mean if my code been migratet does it might work on different lua platforrm ?
      vk.com/yan_alex
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    • antixantix Member
      @Yan, just for Gideros AFAIK
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    • YanYan Member
      @Yan, just for Gideros AFAIK
      Well, its very cool enhancement, but a little bit confusing as its a local language mutation, may be confusing

      vk.com/yan_alex
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    • keszeghkeszegh Member
      some say that it even has some advantages as it is harder to steal your code.

      Likes: SinisterSoft

      Longtitle Productions, creator of
      Fragmenter - animated loop machine and IKONOMIKON - the memory game
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    • SinisterSoftSinisterSoft Maintainer
      edited November 2017
      Yes, it should be harder to steal your code as the produced bytecode is not the same as regular lua bytecode.

      The extra operators, fake thread system, etc that have added are also completely optional - The Gideros version of lua is source code compatible with Lua 5.1. Your source code from other systems will work fine if you are moving to Gideros.

      An enhancement to Gideros Lua a while back that made it have a universal 32/64 bit Lua bytecode. This means that the same bytecode will run fine on either a 32 or 64 bit computer. This gets rid of the problem of having to include (encrypted) source code in an iOS IPA file (like other systems do - that also have had their encryption cracked).

      Likes: Atavismus, antix

      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • totebototebo Member
      I think it would be a good idea to document these "Lua extensions" separately, maybe under a new tab, to avoid confusion?

      Likes: keszegh, pie, jdbc, antix, SinisterSoft, Yan

      My Gideros games: www.totebo.com
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    • jdbcjdbc Member
      edited November 2017
      Better and easier syntax for Lua arrays.
      JDBC Games on Google Play
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    • SinisterSoftSinisterSoft Maintainer
      @jdbc - that's good as the title of one of the 'extensions'.

      I don't know what the name of the mutation operators should be.

      @totebo How do you add an extra tab - I have no idea.
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • totebototebo Member
      Also no idea! Meant next to "Main API", "Physics API", "Lua API" etc.
      My Gideros games: www.totebo.com
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    • keszeghkeszegh Member
      also "Labs" could/should be merged with "Plugins", doesn't it?

      Likes: antix

      Longtitle Productions, creator of
      Fragmenter - animated loop machine and IKONOMIKON - the memory game
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    • SinisterSoftSinisterSoft Maintainer
      I've written the docs for the enhancements. Hopefully @hgy29 can add them in the next build.
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • EricCarrEricCarr Member
      edited November 2017
      This is exciting! I love using += in other languages. It's finally coming to Gideros Lua. :D

      Likes: antix, SinisterSoft

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    • SinisterSoftSinisterSoft Maintainer
      With (a lot of) @hgy29 's help I've added some help text about the Lua enhancements...

      http://docs.giderosmobile.com/reference/enhancement

      Likes: totebo

      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • totebototebo Member
      Awesome! Neat and tidy.

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    • SinisterSoftSinisterSoft Maintainer
      New proper forum announcement post :)
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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    • piepie Member
      edited November 2017
      @SinisterSoft Univeral Bytecode :)

      p.s. great job, thanks!

      Likes: SinisterSoft

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    • SinisterSoftSinisterSoft Maintainer
      Well spotted. fixed for next update by @hgy29.
      Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
      https://deluxepixel.com
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