SUPER STRICT for LUA

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pgimeno
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Re: SUPER STRICT for LUA

Post by pgimeno »

ivan wrote: Mon Jan 11, 2021 6:32 pm I have changed the following patterns:

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hexp = "0x%x+[Pp][%-%+]?%x"
float = "%d*%.%d+[Ii]?"
The x can also be upper and lower case (same as in integers, by the way). The exponent can only be decimal digits. The pattern does not support decimal point in the mantissa, or more than one digit in the exponent.

You can use this pattern:

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hexp = "0[Xx]%x-%.?%x-[Pp][%-%+]?%d+"
It will accept invalid numbers like 0xp3 or 0x.p3, but it's not up to this kind of library to report syntax errors, so I guess it's OK. If you still want it to err for invalid cases, it can be properly processed with two patterns:

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hexp1 = "0[Xx]%x+%.?[Pp][%-%+]?%d+"  -- mantissa without decimals, point optional
hexp2 = "0[Xx]%x-%.%x+[Pp][%-%+]?%d+"  -- mantissa with decimals, point mandatory
All patterns untested.
grump
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Re: SUPER STRICT for LUA

Post by grump »

ivan wrote: Mon Jan 11, 2021 9:01 pm
I tried using it with a larger project, but it really doesn't like C modules. And C modules exporting globals is probably double the trouble.
I'll make if work if you show me a concrete example.
I recall you being a Windows guy, so I hope this will suffice because I couldn't test it in Windows. Don't run the zip, extract it first. It will fail when sstrict.lua is used, but work fine without it.

The "globals exported by C module" issue is not demonstrated by this, I don't have a lib ready that actually does that.

Also, this should work in main thread and worker threads:

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require('sstrict')
require('love.image')
local bit = require('bit')
Attachments
sstrictcmod.zip
(227.08 KiB) Downloaded 123 times
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ivan
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Re: SUPER STRICT for LUA

Post by ivan »

Thanks so much for the feedback everybody, I have pushed an update featuring the following changes:
1.added the new patterns by pgimeno (thanks!)
2.binary files are skipped (as requested by grump)
3.dofile support (this will need testing)
4.loadstring support
Note that [[double brackets]] can have any number of [===]equal signs[===] inside them
This turns out to be a difficult issue. I don't know if we can catch these cases using pattern matching.
The parser can now handle up to 3 equal signs but we will need a better solution in the long term.

PS. SUPERSTRICT now detects empty code blocks such as:

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local function oops()
  -- empty
end
local list = {1,2,3}
for _ in ipairs(list) do
  -- empty
end
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pgimeno
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Re: SUPER STRICT for LUA

Post by pgimeno »

ivan wrote: Tue Jan 12, 2021 8:07 am This turns out to be a difficult issue. I don't know if we can catch these cases using pattern matching.
The parser can now handle up to 3 equal signs but we will need a better solution in the long term.
They need special separate treatment. For example:

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  local startstring, laststart = script:find("^%[=*%[")
  if startstring then
    local nequals = laststart - startstring - 1
    local endstring = script:find("%]" .. ("="):rep(nequals) .. "%]")
    if endstring then
      return script:sub(1, endstring + nequals + 1)
    else
      error("String or comment not properly closed")
    end
  end
(untested)

I abuse that Lua feature sometimes, and I'm probably not alone, e.g. https://love2d.org/forums/viewtopic.php ... 61#p234861

By the way, it still does not accept integer hex numbers with an uppercase X, like this: VAR = 0X2 or VAR = 0X2ULL

Edit: This isn't correctly processed:

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print("a\"b")

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luajit: ./sstrict.lua:179: 
./test.lua:2: undefined variable 'a'
And Lua patterns aren't powerful enough to properly parse it, so quoted strings also need special treatment.

I think in the end grump is right, it's a can of worms.
Last edited by pgimeno on Wed Jan 13, 2021 1:22 pm, edited 1 time in total.
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ivan
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Re: SUPER STRICT for LUA

Post by ivan »

Hey, I have just pushed a fix for the uppercase issue.
Thanks for the heads up.

Also I have made SUPERSTRICT less verbose now.
Certain empty blocks are reported:

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local function boo(a, b)
  -- empty code block error
end
for i = 1, 100 do
  -- empty code block error
end
Others are allowed:

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local obj = {}
function obj:baz()
  -- allowed because it's inside an object
end
while myFunc() do
  -- allowed because of the call to myFunc()
end
When dealing with lists of variables, an error is reported ONLY if the entire list of variables is unused:

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local function getHeight()
  local w, h = love.graphics.getDimensions()
  return -- error because both w and h are unused
end
No error because one of the variables in the list (h) is used:

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local function getHeight()
  local w, h = love.graphics.getDimensions()
  return h -- w is unused but it's ok
end
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ivan
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Re: SUPER STRICT for LUA

Post by ivan »

SUPERSRTICT now finds too many values on the right-hand side during assignment.

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local a = 1, 2 -- too many values in assignment
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zorg
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Re: SUPER STRICT for LUA

Post by zorg »

ivan wrote: Tue Jan 12, 2021 12:33 pm Others are allowed:

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local obj = {}
function obj:baz()
  -- allowed because it's inside an object
end
while myFunc() do
  -- allowed because of the call to myFunc()
end
since : is just syntax sugar, are empty functions of this form allowed or not? i'd assume they are since they're in a table as well, due to the .

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function obj.baz(self_but_not_necessarily_called_self_specifically, other_params_or_maybe_not)
  -- ?
end
Me and my stuff :3True Neutral Aspirant. Why, yes, i do indeed enjoy sarcastically correcting others when they make the most blatant of spelling mistakes. No bullying or trolling the innocent tho.
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ivan
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Re: SUPER STRICT for LUA

Post by ivan »

Hey zorg. Thank you for taking a look!
Looking at the code I see that function() obj.baz end would raise an error.
The reason why I allowed function() obj:baz() end was because of inheritance where somebody could override the empty function.
After some additional thought, I realize that maybe this should be disallowed too.
It's not good design to have empty functions I think.
I'm not 100% sure so this question is open to debate.
grump
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Re: SUPER STRICT for LUA

Post by grump »

ivan wrote: Wed Jan 13, 2021 7:49 am It's not good design to have empty functions I think.
I'm not 100% sure so this question is open to debate.
I think you're getting a tiny bit overzealous there. An empty function doesn't happen by accident, and treating it like a bug is going one step too far.
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ivan
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Re: SUPER STRICT for LUA

Post by ivan »

grump wrote: Wed Jan 13, 2021 11:44 am I think you're getting a tiny bit overzealous there. An empty function doesn't happen by accident, and treating it like a bug is going one step too far.
Hehe, yea you're probably right.
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