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Contents
require_relative 'display_width/constants'
require_relative 'display_width/index'
module Unicode
module DisplayWidth
DEPTHS = [0x10000, 0x1000, 0x100, 0x10].freeze
def self.of(string, ambiguous = 1, overwrite = {}, options = {})
res = string.codepoints.inject(0){ |total_width, codepoint|
index_or_value = INDEX
codepoint_depth_offset = codepoint
DEPTHS.each{ |depth|
index_or_value = index_or_value[codepoint_depth_offset / depth]
codepoint_depth_offset = codepoint_depth_offset % depth
break unless index_or_value.is_a? Array
}
width = index_or_value.is_a?(Array) ? index_or_value[codepoint_depth_offset] : index_or_value
width = ambiguous if width == :A
total_width + (overwrite[codepoint] || width || 1)
}
res -= emoji_extra_width_of(string) if options[:emoji]
res < 0 ? 0 : res
end
def self.emoji_extra_width_of(string, ambiguous = 1, overwrite = {}, _ = {})
require "unicode/emoji"
extra_width = 0
modifier_regex = /[#{ Unicode::Emoji::EMOJI_MODIFIERS.pack("U*") }]/
zwj_regex = /(?<=#{ [Unicode::Emoji::ZWJ].pack("U") })./
string.scan(Unicode::Emoji::REGEX){ |emoji|
extra_width += 2 * emoji.scan(modifier_regex).size
emoji.scan(zwj_regex){ |zwj_succ|
extra_width += self.of(zwj_succ, ambiguous, overwrite)
}
}
extra_width
end
end
end
# Allows you to opt-out of the default string extension. Will eventually be removed,
# so you must opt-in for the core extension by requiring 'display_width/string_ext'
unless defined?(Unicode::DisplayWidth::NO_STRING_EXT) && Unicode::DisplayWidth::NO_STRING_EXT
require_relative 'display_width/string_ext'
end
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