+
Lua 5.4 Reference Manual
+
Lua 5.4 Reference Manual
-Copyright © 2020–2023 Lua.org, PUC-Rio. +Copyright © 2020–2024 Lua.org, PUC-Rio. Freely available under the terms of the -Lua license. +Lua license.
+
Lua 5.4 Reference Manual
-Copyright © 2020–2023 Lua.org, PUC-Rio. +Copyright © 2020–2024 Lua.org, PUC-Rio. Freely available under the terms of the -Lua license. +Lua license.
@@ -391,7 +391,7 @@ Whenever there is an error, an error object is propagated with information about the error. Lua itself only generates errors whose error object is a string, -but programs may generate errors with +but programs can generate errors with any value as the error object. It is up to the Lua program or its host to handle such error objects. For historical reasons, @@ -401,7 +401,7 @@ even though it does not have to be a string.
When you use xpcall (or lua_pcall, in C)
-you may give a message handler
+you can give a message handler
to be called in case of errors.
This function is called with the original error object
and returns a new error object.
@@ -453,7 +453,7 @@ which is then called a metamethod.
In the previous example, the key is the string "__add"
and the metamethod is the function that performs the addition.
Unless stated otherwise,
-a metamethod may in fact be any callable value,
+a metamethod can in fact be any callable value,
which is either a function or a value with a __call metamethod.
@@ -1725,7 +1725,7 @@ labels in Lua are considered statements too:
A label is visible in the entire block where it is defined,
except inside nested functions.
-A goto may jump to any visible label as long as it does not
+A goto can jump to any visible label as long as it does not
enter into the scope of a local variable.
A label should not be declared
where a label with the same name is visible,
@@ -5571,7 +5571,7 @@ otherwise, returns NULL.
lua_toclose-[-0, +0, m] +[-0, +0, v]
void lua_toclose (lua_State *L, int index);
@@ -5591,6 +5591,11 @@ by any other function in the API except lua_settop.
+lua_closeslot
+This function raises an error if the value at the given slot
+neither has a __close metamethod nor is a false value.
+
+
This function should not be called for an index that is equal to or below an active to-be-closed slot. @@ -5664,6 +5669,12 @@ after its last character (as in C), but can contain other zeros in its body. +
+This function can raise memory errors only
+when converting a number to a string
+(as then it may create a new string).
+
+
@@ -11276,13 +11287,13 @@ The returned table can contain all the fields returned by what describing which fields to fill in.
The default for
@@ -11619,6 +11630,10 @@ Lua does not consult any environment variables.
In particular,
the values of
@@ -12033,13 +12048,12 @@ and LiteralString, see §3.1.)
-
what is to get all information available,
except the table of valid lines.
-If present,
-the option 'f'
+The option 'f'
adds a field named func with the function itself.
-If present,
-the option 'L'
-adds a field named activelines with the table of
-valid lines.
+The option 'L' adds a field named activelines
+with the table of valid lines,
+provided the function is a Lua function.
+If the function has no debug information,
+the table is empty.
package.path and package.cpath
are set with the default paths defined in luaconf.h.
+To signal to the libraries that this option is on,
+the stand-alone interpreter sets the field
+"LUA_NOENV" in the registry to a true value.
+Other libraries may consult this field for the same purpose.