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- Subject: Re: Future plans for Lua and Unicode
- From: Dirk Laurie <dirk.laurie@...>
- Date: Thu, 5 Jul 2012 18:46:11 +0200
2012/7/5 Simon Orde <firstname.lastname@example.org>:
> … let my script-writers write in UTF-16 (or
> whatever) and save the code as UTF-8 to pass to Lua. This idea hadn't
> occurred to me. Without thinking about it too carefully, I'd been assuming
> that Lua expects code (e.g. as supplied in a C++ call to lua_load) to be in
> ANSI. But is your suggestion really always guaranteed to work - even in
> future versions of Lua? I have to admit, I can't instantly think of any
> reason why it shouldn't. Sorry to press you on this, but I have read
> "Programming in Lua" and I have the Lua Reference Manual, and I can't find
> anything relevant to this in either of them.
Lua expects code to be in ASCII except inside string literals.
In long strings (delimited by [[…]]) almost anything goes … with one
exception: end-of-line. Another system's EOL is converted to your
That is precisely the behaviour you want when the long string contains
some UTF-8 text; I can't speak for UTF-16. But it does mean that the
only way of reliably entering *arbitrary* strings as literals is to
enter them as short strings with non-ASCII characters escaped.