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Small changes in the manual

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Roberto Ierusalimschy
2025-03-12 15:45:39 -03:00
parent ab66652b32
commit d9e0f64a5d
1 changed files with 22 additions and 16 deletions
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38
manual/manual.of
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@@ -2222,10 +2222,10 @@ f(3, 4, 5) a=3, b=4
f(r(), 10) a=1, b=10 f(r(), 10) a=1, b=10
f(r()) a=1, b=2 f(r()) a=1, b=2
g(3) a=3, b=nil, ... --> (nothing) g(3) a=3, b=nil, ... -> (nothing)
g(3, 4) a=3, b=4, ... --> (nothing) g(3, 4) a=3, b=4, ... -> (nothing)
g(3, 4, 5, 8) a=3, b=4, ... --> 5 8 g(3, 4, 5, 8) a=3, b=4, ... -> 5 8
g(5, r()) a=5, b=1, ... --> 2 3 g(5, r()) a=5, b=1, ... -> 2 3
} }
Results are returned using the @Rw{return} statement @see{control}. Results are returned using the @Rw{return} statement @see{control}.
@@ -7477,25 +7477,25 @@ then there is no replacement
Here are some examples: Here are some examples:
@verbatim{ @verbatim{
x = string.gsub("hello world", "(%w+)", "%1 %1") x = string.gsub("hello world", "(%w+)", "%1 %1")
--> x="hello hello world world" -- x="hello hello world world"
x = string.gsub("hello world", "%w+", "%0 %0", 1) x = string.gsub("hello world", "%w+", "%0 %0", 1)
--> x="hello hello world" -- x="hello hello world"
x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1") x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
--> x="world hello Lua from" -- x="world hello Lua from"
x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv) x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv)
--> x="home = /home/roberto, user = roberto" -- x="home = /home/roberto, user = roberto"
x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s) x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s)
return load(s)() return load(s)()
end) end)
--> x="4+5 = 9" -- x="4+5 = 9"
local t = {name="lua", version="5.4"} local t = {name="lua", version="5.4"}
x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t) x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t)
--> x="lua-5.4.tar.gz" -- x="lua-5.4.tar.gz"
} }
} }
@@ -9299,15 +9299,21 @@ the interpreter waits for its completion
by issuing a different prompt. by issuing a different prompt.
Note that, as each complete line is read as a new chunk, Note that, as each complete line is read as a new chunk,
local variables do not outlive lines: local variables do not outlive lines.
To steer clear of confusion,
the interpreter gives a warning if a line starts with the
reserved word @Rw{local}:
@verbatim{ @verbatim{
> x = 20 > x = 20 -- global 'x'
> local x = 10; print(x) --> 10 > local x = 10; print(x)
> print(x) --> 20 -- global 'x' --> warning: locals do not survive across lines in interactive mode
> do -- incomplete line --> 10
> print(x) -- back to global 'x'
--> 20
> do -- incomplete chunk
>> local x = 10; print(x) -- '>>' prompts for line completion >> local x = 10; print(x) -- '>>' prompts for line completion
>> print(x) >> print(x)
>> end -- line completed; Lua will run it as a single chunk >> end -- chunk completed
--> 10 --> 10
--> 10 --> 10
} }