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# -*- encoding: utf-8 -*-
require "unicode_utils/display_width"
module UnicodeUtils
# Get the width of +char+ when displayed with a fixed pitch font.
#
# Some code points (especially from east asian scripts) take the
# width of two characters, while others have no width.
#
# Examples:
#
# require "unicode_utils/char_display_width"
# UnicodeUtils.char_display_width("別") # => 2
# UnicodeUtils.char_display_width(0x308) # => 0
# UnicodeUtils.char_display_width("a") # => 1
#
# Performs the same logic as UnicodeUtils.display_width, but for a
# single code point.
def char_display_width(char)
cp = char.ord
# copied from display_width, keep in sync!
case UnicodeUtils.east_asian_width(cp)
when :Wide, :Fullwidth then 2
else GENERAL_CATEGORY_BASIC_WIDTH_MAP[UnicodeUtils.gc(cp)]
end
end
module_function :char_display_width
end
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