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Available since: Gideros 2016.06
Class: utf8


Return the character index at given location in string s. this is a reverse operation of utf8.width(). this function return a index of location, and a offset in in UTF-8 encoding. e.g. if cursor is at the second column (middle) of the wide char, offset will be 2. the width of character at idx is returned, also.

(number) = utf8.widthindex(s,location,ambi_is_double,default_width)


s: (string)
location: (number)
ambi_is_double: (boolean) optional
default_width: (number) optional

Return values

Returns (number) character index at given location