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Optional initialization for global declarations

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This commit is contained in:
Roberto Ierusalimschy
2025-07-08 13:33:57 -03:00
parent 8485687908
commit 942c10a5e3
7 changed files with 96 additions and 38 deletions
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18
manual/manual.of
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@@ -229,7 +229,7 @@ as the following example illustrates:
@verbatim{
X = 1 -- Ok, global by default
do
global Y -- voids implicit initial declaration
global Y -- voids the implicit initial declaration
Y = 1 -- Ok, Y declared as global
X = 1 -- ERROR, X not declared
end
@@ -269,7 +269,7 @@ print(x) --> 10 (the global one)
Notice that, in a declaration like @T{local x = x},
the new @id{x} being declared is not in scope yet,
and so the @id{x} in the left-hand side refers to the outside variable.
and so the @id{x} in the right-hand side refers to the outside variable.
Because of the @x{lexical scoping} rules,
local variables can be freely accessed by functions
@@ -1651,11 +1651,12 @@ Function calls are explained in @See{functioncall}.
@sect3{localvar| @title{Variable Declarations}
Local and global variables can be declared anywhere inside a block.
The declaration for locals can include an initialization:
The declaration can include an initialization:
@Produc{
@producname{stat}@producbody{@Rw{local}
attnamelist @bnfopt{@bnfter{=} explist}}
@producname{stat}@producbody{@Rw{global} attnamelist}
@producname{stat}@producbody{@Rw{global}
attnamelist @bnfopt{@bnfter{=} explist}}
}
If present, an initial assignment has the same semantics
of a multiple assignment @see{assignment}.
@@ -1712,7 +1713,8 @@ and a program that starts with any other global declaration
(e.g., @T{global none}) can only refer to declared variables.
Note that, for global variables,
the effect of any declaration is only syntactical:
the effect of any declaration is only syntactical
(except for the optional assignment):
@verbatim{
global X <const>, _G
X = 1 -- ERROR
@@ -3924,8 +3926,8 @@ This macro may evaluate its arguments more than once.
}
@APIEntry{unsigned (lua_numbertocstring) (lua_State *L, int idx,
char *buff);|
@APIEntry{unsigned lua_numbertocstring (lua_State *L, int idx,
char *buff);|
@apii{0,0,-}
Converts the number at acceptable index @id{idx} to a string
@@ -4050,7 +4052,7 @@ This function is equivalent to @Lid{lua_pushcclosure} with no upvalues.
}
@APIEntry{const char *(lua_pushexternalstring) (lua_State *L,
@APIEntry{const char *lua_pushexternalstring (lua_State *L,
const char *s, size_t len, lua_Alloc falloc, void *ud);|
@apii{0,1,m}