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


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 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.


Click to collapse [-]

This example

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

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

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