Privately patching strings lib in Lua 5.2
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- Subject: Privately patching strings lib in Lua 5.2
- From: Andrew Starks <andrew.starks@...>
- Date: 2013年12月20日 09:58:01 -0600
```lua
_ENV = {
print = print, string = string, table = table, pairs = pairs, type = type
}
do
local _string = string
local concat = table.concat
string = {}
for m_name, m_func in pairs(_string) do
string[m_name] = m_func
end
function string:map(...)
local args = type(...) == "table" and (...) or {...}
return self .. concat(args, self)
end
end
--testing
--This is result that I want.
print(string.map("test","this", "that"))
-->testthistestthat
--This is the syntax that I want to use, but it doesn't work...
print(("test"):map("this", "that"))
--lua: ...src\testing\test_string_library_question.lua:23: attempt to
call method 'map' (a nil value)
```
If I skip the parts where I hide my change from the global
environment, then both function calls behave identically.
Is there a way to patch the `string` library so that the changes apply
to strings using the `self`/colon method, without patching `string`
globally? Debug library?
--Andrew