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Calculates the width of UTF-8 strings with special/unprintable characters, which require special width treatment.


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

Required Arguments

  • input: A string character sequence OR a codepoint integer

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 below).
  • default_width: An integer, if given, is used as width for unprintable characters.


Returns the integer width of the input string OR the width of the codepoint integer.


Click to collapse [-]

This example shows the difference when ambi_is_double is set to false or true.

local input = "днём"
local disabled = utf8.width( input, false )
local enabled = utf8.width( input, true )

print( disabled, enabled ) -- 4, 8

See Also