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Contents
# frozen_string_literal: true
require_relative "display_width/constants"
require_relative "display_width/index"
module Unicode
class 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, ambiguous, overwrite) 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
def initialize(ambiguous: 1, overwrite: {}, emoji: false)
@ambiguous = ambiguous
@overwrite = overwrite
@emoji = emoji
end
def get_config(**kwargs)
[
kwargs[:ambiguous] || @ambiguous,
kwargs[:overwrite] || @overwrite,
{ emoji: kwargs[:emoji] || @emoji },
]
end
def of(string, **kwargs)
self.class.of(string, *get_config(**kwargs))
end
end
end
Version data entries
19 entries across 15 versions & 7 rubygems