Nice and concise.
Here's my more complex version, inspired by how python handles classes and descriptors: https://github.com/eric-wieser/pylua
There are some examples there at the bottom of the page.
Eric's Content
There have been 88 items by Eric (Search limited from 10-February 22)
#114972 A nice, small class implementation.
#100250 BasicUtils v1.5
But can you deepcopy while preserving references?
local t = {}
t.value = 1
t.self = t
local q = deepcopy(t)
assert(q.self == q)
#92914 Shorter if statement
print(random_var == 5 and "Hello World!" or "Bye World!")
#91959 Block API v0.7
I think you're missing a "return bobble" in there somewhere
#91085 adding object API functions to object metatables
tesla1889, on 25 February 2013 - 09:47 AM, said:
Eric, on 25 February 2013 - 07:26 AM, said:
That's not possible for tables, since you end up overwriting the methods with your keys.
so yes. you could. but that wouldnt help you at all
Ok, take this example:
local openDoorFor = {
Eric = true,
Notch = true
}
if openDoorFor[somePlayerName] then
-- ...
end
Ok, so what if `somePlayerName` is 'insert' or 'remove'. This is why raw tables cannot themselves have metatables.
#91034 [1.5] os.queueEvent("modem_message", ...) also fires rednet_message
You should never have to requeue events - use the parallel API instead, where all events are sent to each thread.
#91032 adding object API functions to object metatables
That's not possible for tables, since you end up overwriting the methods with your keys.
#90988 [1.48] os.queueEvent/os.pullEvent fail for 8-bit strings
Found another related bug in the file system:
fs.makeDir('d') -- empty directory
local h = fs.open('d/'..string.char(128), 'w') -- odd filename
assert(h == nil) -- which doesn't get created - fair enough
-- So there should be no files in the directory, right?
local files = fs.list('d')
assert(#files == 1) -- except there are
-- Can you guess what the name of the file is?
local file = files[1]
print(files[1]:byte(1, math.huge))
That outputs:239 190 128
#90983 reading pointers
TheOriginalBIT, on 25 February 2013 - 01:59 AM, said:
More accurately, Events don't work with string.dump
#90980 [1.48] os.queueEvent/os.pullEvent fail for 8-bit strings
This is the root cause of this "suggestion": http://www.computerc...net-being-crap/
Test #1: check that :byte and .char work as expected:
Test #2: Check that strings are preserved through events:
To summarize, either queueEvent or pullEvent fail to pass strings containing characters above character 127.
This bug is almost certainly present in 1.5 as well, although I haven't tested it.
Test #1: check that :byte and .char work as expected:
for i = 0, 255 do
local c = string.char(i)
local j = c:byte()
if j ~= i then
print(("FAIL: Converting %d from int->char->int gave %d"):format(i, j))
end
end
PassesTest #2: Check that strings are preserved through events:
for i = 0, 255 do
local c = string.char(i)
os.queueEvent('test', c)
local _, c2 = os.pullEvent('test')
assert(#c == 1 and #c2 == 1) -- to prove these are single-byte strings
local j = c2:byte()
if c ~= c2 then
print(("FAIL: Passing %d through an event gives %d"):format(i, j))
end
end
Fails:FAIL: Passing 128 through an event gives 239 FAIL: Passing 129 through an event gives 239 FAIL: Passing 130 through an event gives 239 ... FAIL: Passing 255 through an event gives 239
To summarize, either queueEvent or pullEvent fail to pass strings containing characters above character 127.
This bug is almost certainly present in 1.5 as well, although I haven't tested it.
#90953 reading pointers
String.dump(f) will allow you to send simple functions which contain no upvalues.
#90949 1.5 Causes "shell:149 No such method isPresent"
Have you checked line 149 of lua/rom/programs/shell to see if there's an obvious error?
#90463 [New Lua Function] os.getVersion (yes I know there is os.version)
Version identifiers are not decimals and should not be treated as such. Consider:
Keep it as a string, or switch to an array of integers.
1.0 1.1 1.2 ... 1.8 1.9 1.10 1.11Those are in order of increasing version, but not numeric or lexographic order.
Keep it as a string, or switch to an array of integers.
#86642 Split a string in two variables
CC's gmatch is in bios.lua (for reasons I don't fully understand), and falls back on :find (which is java-side)
#86641 need help with metatables
Your meteta les are irrelevant here. What you're seeing is standard pass-by-reference behaviour for tables.
t = {}
s = {test = "test"}
table.insert(t, s)
s.test = "changed"
print(t[0].test)
#86077 Split a string in two variables
local message, size, color = message:match('/(.+)-(.-)-(.-)')
#85970 Split a string in two variables
local command, args = message:match('/(.-) (.+)')
#85929 The HTTP API should allow us to set headers.
A related addition to the HTTP API would be to allow reading of response headers, most importantly status codes.
@raineth: Nice! (+1)
@raineth: Nice! (+1)
#85880 Extending Existing API's
Your first method should work just fine.
#83219 [API][MiscPeripherals] Music API (Iron Note Block)
Pro-tip: instead of
consider using:
Here's the same api, in half as many lines.
a=peripheral.wrap("top")
b=peripheral.wrap("bottom")
c=peripheral.wrap("front")
d=peripheral.wrap("back")
e=peripheral.wrap("left")
f=peripheral.wrap("right")
if a then
g=a
elseif b then
g=b
elseif c then
g=c
elseif d then
g=d
elseif e then
g=e
elseif f then
g=f
else
-- ...
consider using:
g = peripheral.wrap("top")
or peripheral.wrap("bottom")
or peripheral.wrap("front")
or peripheral.wrap("back")
or peripheral.wrap("left")
or peripheral.wrap("right")
if not g then
-- ...
Here's the same api, in half as many lines.
#80815 Creating a New Computercraft Function.
remiX, on 26 January 2013 - 10:52 AM, said:
elseif type(lengthOn) ~= "string" then error("Bad argument #3, number expected - got " .. type(lengthOn))
elseif type(lengthOff) ~= "string" then error("Bad argument #4, number expected - got " .. type(lengthOff))
elseif type(nTimes) ~= "string" then error("Bad argument #5, number expected - got " .. type(nTimes))
I would say avoid type checking where possible - it violates the principle of duck typing.
#80623 run functions of other files
No, you actually wouldnt even get "attempt to perform arithmetic __div on nil and nil". That code produces a syntax error, not a runtime error.
Put "3/4" in a file and run it (the CC Lua shell doesn't show this behavior) and you'll see what I mean.
Put "3/4" in a file and run it (the CC Lua shell doesn't show this behavior) and you'll see what I mean.
#80588 os.pullevent while thing?
What do you mean by "let them use the computer regulary"?
#80558 run functions of other files
sjele, on 26 January 2013 - 08:48 AM, said:
path/to/my/file.functionName()
That's a syntax error, since that's equivalent to (path/to/my) / ( file.functionName() ), which is an expression, not a statement (in the same way that 1 + 1 is not a valid line of lua code).
#79352 Octree - Efficient way of storing, and querying 3D data
BigSHinyToys, on 23 January 2013 - 09:08 AM, said:
NeverCast, on 23 January 2013 - 08:46 AM, said:
If this were me I would've just created a function that returns a unique key for x,y,z, and then dropped values in to the table with those keys.
It would automatically return nil if it didn't exist.
That said, the code is impressive.. and maybe one day it'll have a cause!
It would automatically return nil if it didn't exist.
That said, the code is impressive.. and maybe one day it'll have a cause!
local tTable = {}
local function get(x,y,z)
return tTable[table.concat({x,y,z},"-")]
end
local function set(x,y,z,val)
tTable[table.concat({x,y,z},"-")] = val
end
Or in a cooler way:
local grid_mt = {
__index = function(self, t)
return rawget(self, table.concat(t, "-"))
end,
__index = function(self, t, v)
return rawset(self, table.concat(t, "-"), v)
end
}
local grid1 = setmetatable({}, grid_mt)
local grid2 = setmetatable({}, grid_mt)
grid1[{1, 2, 3}] = 3
grid2[{4, 5, 6}] = grid1[{1, 2, 3}]
