Lua Five Three

wiki

Summaries of differences between 5.2 and 5.3 can be found here:

• http://www.lua.org/work/doc/#changes
• http://www.lua.org/work/doc/manual.html#8
• http://www.lua.org/wshop14/Ierusalimschy.pdf "Integers in Lua 5.3" Р. Иеруcалимский PUC-Rio
• https://devhacksandgoodies.wordpress.com/2014/05/06/whats-new-in-lua-5-3/ (old alpha work 2)

Announcements:

• LuaList:2013-07/msg00167.html 5.3.0(work1)
• LuaList:2014-03/msg00564.html 5.3.0(work2)
• LuaList:2014-06/msg00466.html 5.3.0(work3)
• LuaList:2014-07/msg00600.html 5.3.0(alpha)
• LuaList:2014-10/msg00182.html 5.3.0(beta)
• LuaList:2014-12/msg00201.html 5.3.0(rc1)
• LuaList:2014-12/msg00358.html 5.3.0(rc2)

Areas affected also described on the wiki include

• BitwiseOperators
  • http://www.lua.org/work/doc/manual.html#3.4.2
  • http://www.lua.org/work/doc/manual.html#2.4
• StructurePacking
  • http://www.lua.org/work/doc/manual.html#pdf-string.pack
  • http://www.lua.org/work/doc/manual.html#pdf-string.packsize
  • http://www.lua.org/work/doc/manual.html#pdf-string.unpack
• LuaUnicode
  • http://www.lua.org/work/doc/manual.html#6.5
• GeneralizedPairsAndIpairs "ipairs and the table library respect metamethods" (README)
• string.dump http://www.lua.org/work/doc/manual.html#pdf-string.dump strip would be usable in LuaCompilerInLua and was previously in LuaJit.

Other areas this page might address: LuaJIT? and LuaImplementations? IDE support?

table.move

table.move (a1, f, e, t [,a2]) http://www.lua.org/work/doc/manual.html#pdf-table.move

This new function does a copy of a range of values.

Design-wise, this function bears some resemblance to the C memmove [1] function but is not implemented in terms of it. The source and destination ranges may overlap (unlike the C memcpy).

table.move provides a convenient way to clear (all or some of) an array too:

table.move(a, #a+1, 2*#a, 1)

table.move was previously named table.copy in 5.3.0(alpha).

table.move is internally implemented with lua_geti/lua_seti [2][3] or (if t lacks __index/__newindex metamethods) lua_rawgeti/lua_rawseti [4]/[5]. (See checktab/aux_getn and tmove in ltablib.c.)

lua_rotate

void lua_rotate (lua_State *L, int idx, int n); https://www.lua.org/manual/5.3/manual.html#lua_rotate

Discussions:

• LuaList:2014-06/msg00466.html 5.3.0(work3), LuaList:2014-06/msg00508.html
• LuaList:2003-07/msg00379.html

Observe lua.h definitions of lua_insert and lua_remove in terms of lua_rotate:

#define lua_insert(L,idx)	lua_rotate(L, (idx), 1)
#define lua_remove(L,idx)	(lua_rotate(L, (idx), -1), lua_pop(L, 1))

arg

The readme says "arg table available to all code".

Discussions:

• LuaList:2014-08/msg00216.html
• LuaList:2014-06/msg00466.html 5.3.0(work3) "stand-alone interpreter creates 'arg' before running any code"

"userdata can have any Lua value as uservalue"

Discussions:

• LuaList:2013-12/msg00008.html