Difference between revisions of "utf8"
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This library provides basic support for handling UTF-8 encoded strings. It provides all its functions inside the table returned by <code>require("utf8")</code>. This library does not provide any support for Unicode other than handling UTF-8 encoding. Any operation that needs the meaning of a character, such as character classification, is outside its scope. | This library provides basic support for handling UTF-8 encoded strings. It provides all its functions inside the table returned by <code>require("utf8")</code>. This library does not provide any support for Unicode other than handling UTF-8 encoding. Any operation that needs the meaning of a character, such as character classification, is outside its scope. | ||
− | + | == Examples == | |
+ | Print text the user writes, and erase it using the UTF-8 module. | ||
<source lang="lua"> | <source lang="lua"> | ||
local utf8 = require("utf8") | local utf8 = require("utf8") | ||
+ | |||
+ | function love.load() | ||
+ | text = "Type away! -- " | ||
+ | |||
+ | -- enable key repeat so backspace can be held down to trigger love.keypressed multiple times. | ||
+ | love.keyboard.setKeyRepeat(true) | ||
+ | end | ||
+ | |||
+ | function love.textinput(t) | ||
+ | text = text .. t | ||
+ | end | ||
+ | |||
+ | function love.keypressed(key) | ||
+ | if key == "backspace" then | ||
+ | -- get the byte offset to the last UTF-8 character in the string. | ||
+ | local byteoffset = utf8.offset(text, -1) | ||
+ | |||
+ | if byteoffset then | ||
+ | -- remove the last UTF-8 character. | ||
+ | -- string.sub operates on bytes rather than UTF-8 characters, so we couldn't do string.sub(text, 1, -2). | ||
+ | text = string.sub(text, 1, byteoffset - 1) | ||
+ | end | ||
+ | end | ||
+ | end | ||
+ | |||
+ | function love.draw() | ||
+ | love.graphics.printf(text, 0, 0, love.graphics.getWidth()) | ||
+ | end | ||
</source> | </source> | ||
Revision as of 07:12, 19 March 2015
Available since LÖVE 0.9.2 |
This module is not supported in earlier versions. |
This library provides basic support for handling UTF-8 encoded strings. It provides all its functions inside the table returned by require("utf8")
. This library does not provide any support for Unicode other than handling UTF-8 encoding. Any operation that needs the meaning of a character, such as character classification, is outside its scope.
Examples
Print text the user writes, and erase it using the UTF-8 module.
local utf8 = require("utf8")
function love.load()
text = "Type away! -- "
-- enable key repeat so backspace can be held down to trigger love.keypressed multiple times.
love.keyboard.setKeyRepeat(true)
end
function love.textinput(t)
text = text .. t
end
function love.keypressed(key)
if key == "backspace" then
-- get the byte offset to the last UTF-8 character in the string.
local byteoffset = utf8.offset(text, -1)
if byteoffset then
-- remove the last UTF-8 character.
-- string.sub operates on bytes rather than UTF-8 characters, so we couldn't do string.sub(text, 1, -2).
text = string.sub(text, 1, byteoffset - 1)
end
end
end
function love.draw()
love.graphics.printf(text, 0, 0, love.graphics.getWidth())
end
Reference Manual
For detailed usage, see the reference manual.
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