How to get char code in LUA?

Navid · June 17, 2020, 11:01pm

Hi friends
Is there any way to get Character code from string in defold using LUA? ( or just one char of string )
something like what this website do

Denis_Makhortov · June 17, 2020, 11:20pm

I think you need string.byte

Navid · June 17, 2020, 11:41pm

Thanks Denis
It works on english letters but for persian letters it’s different, it gives me just one part of the code, for example persian char “ا” ( alef ) ascii code is “216 167” but it gives me just “216” (first part).

print(string.byte( "ا"))

this function returns ascii code, anyway to get utf-8 or decimal? or converting ascii?

Denis_Makhortov · June 18, 2020, 12:20am

Try

local c = "ا"
print(string.byte(c,1,2))

britzl · June 18, 2020, 5:57am

There are UTF8 Lua modules you can look at:

github.com

britzl/gooey/blob/master/gooey/internal/utf8.lua

-- $Id: utf8.lua 179 2009-04-03 18:10:03Z pasta $
--
-- Provides UTF-8 aware string functions implemented in pure lua:
-- * utf8len(s)
-- * utf8sub(s, i, j)
-- * utf8reverse(s)
-- * utf8char(unicode)
-- * utf8unicode(s, i, j)
-- * utf8gensub(s, sub_len)
-- * utf8find(str, regex, init, plain)
-- * utf8match(str, regex, init)
-- * utf8gmatch(str, regex, all)
-- * utf8gsub(str, regex, repl, limit)
--
-- If utf8data.lua (containing the lower<->upper case mappings) is loaded, these
-- additional functions are available:
-- * utf8upper(s)
-- * utf8lower(s)
--
-- All functions behave as their non UTF-8 aware counterparts with the exception

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Navid · June 18, 2020, 6:51am

Thanks Friends, I’ll try them. I’m trying to use persian suitable and easy in defold without using any extra converter. I don’t know whats the correct way to achieve this but i try to find something.

britzl · June 18, 2020, 9:18am

I think the UTF 8 module I linked is the way to go if you need to manipulate strings with UTF8 encoded text. It will be able to deal with characters that take up more than a single byte.