Utf8.widthindex

Returns the location, offset and width of the character at the given location in the UTF-8 string.

Syntax

int, int, int utf8.widthindex ( string input, int location [, bool ambi_is_double = false, int default_width = 0 ] )

Required Arguments

• input: A string character sequence

Optional Arguments

NOTE: When using optional arguments, you might need to supply all arguments before the one you wish to use. For more information on optional arguments, see optional arguments.

• ambi_is_double: A boolean, if set to true, ambiguous character's width is 2 (see example).
• default_width: An integer, if given, is used as width for unprintable characters.

Returns

Returns the given location, the offset in UTF-8 encoding (if cursor is in the middle of the wide char - offset will be 2) and the width of the character, otherwise only the location as integer will be returned.

Example

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Server

This example

local input = "днём"
local raw_width = utf8.width( input, true )

for location = 1, raw_width do
    print( utf8.widthindex( input, location, true ) )
end

Output (enhanced, not raw):

Character	Location	Offset	Width
д	1	1	2
д	1	2	2
н	2	1	2
н	2	2	2
ё	3	1	2
ё	3	2	2
м	4	1	2
м	4	2	2

See Also

• utf8.byte
• utf8.char
• utf8.charpos
• utf8.escape
• utf8.find
• utf8.fold
• utf8.gmatch
• utf8.gsub
• utf8.insert
• utf8.len
• utf8.lower
• utf8.match
• utf8.ncasecmp
• utf8.next
• utf8.remove
• utf8.reverse
• utf8.sub
• utf8.title
• utf8.upper
• utf8.width
• utf8.widthindex