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module StringDirection
# Strategy to detect direction from the scripts to which string characters belong
class CharactersStrategy < Strategy
# Ignored characters: unicode marks, punctuations, symbols, separator and other general categories
IGNORED_CHARS = '\p{M}\p{P}\p{S}\p{Z}\p{C}'.freeze
# Inspect to wich scripts characters belongs and infer from them the string direction. right-to-left scripts are those in {Configuration#rtl_scripts}
#
# params [String] The string to inspect
# @return [String, nil]
def run(string)
string = string.to_s
if ltr_characters?(string) && rtl_characters?(string)
bidi
elsif ltr_characters?(string)
ltr
elsif rtl_characters?(string)
rtl
end
end
private
def rtl_regex
@rtl_regex ||= /[#{rtl_script_character_classes}]/
end
def ltr_regex
@ltr_regex ||= /[^#{rtl_script_character_classes}#{IGNORED_CHARS}]/
end
def rtl_characters?(string)
string.match(rtl_regex)
end
def ltr_characters?(string)
string.match(ltr_regex)
end
def rtl_script_character_classes
@rtl_script_character_classes ||= rtl_scripts.map { |script| "\\p{#{script}}" }.join
end
def rtl_scripts
StringDirection.configuration.rtl_scripts
end
end
end
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