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module StringDirection
# Strategy to decide direction between ltr or rtl in function of which is the main type
class DominantStrategy < CharactersStrategy
# Get the number of ltr and rtl characters in the supplied string and infer
# direction from the most common type. For this strategy the direction can
# be ltr or rtl, but never bidi. In case of draw it returns nil.
#
# params [String] The string to inspect
# @return [String, nil]
def run(string)
string = string.to_s
ltr_count = chars_count(string, ltr_regex)
rtl_count = chars_count(string, rtl_regex)
diff = ltr_count - rtl_count
return ltr if diff > 0
return rtl if diff < 0
nil
end
private
def chars_count(string, regex)
count = 0
string.scan(regex) { count += 1 }
count
end
end
end
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