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# Copyright (c) 2010, Diaspora Inc. This file is
# licensed under the Affero General Public License version 3 or later. See
# the COPYRIGHT file.
# Deeply inspired by https://gitorious.org/statusnet/mainline/blobs/master/plugins/DirectionDetector/DirectionDetectorPlugin.php
class String
def is_rtl?
return false if self.strip.empty?
count = 0
self.split(" ").each do |word|
if starts_with_rtl_char?(word)
count += 1
else
count -= 1
end
end
return true if count > 0 # more than half of the words are rtl words
return starts_with_rtl_char?(self) # otherwise let the first word decide
end
# Diaspora specific
def cleaned_is_rtl?
string = String.new(self)
[ /@[^ ]+|#[^ ]+/u, # mention, tag
/^RT[: ]{1}| RT | RT: |[♺♻:]/u # retweet
].each do |cleaner|
string.gsub!(cleaner, '')
end
string.is_rtl?
end
def starts_with_rtl_char?(string = self)
return false if string.strip.empty?
char = string.strip.unpack('U*').first
limits = [
[1536, 1791], # arabic, persian, urdu, kurdish, ...
[65136, 65279], # arabic peresent 2
[64336, 65023], # arabic peresent 1
[1424, 1535], # hebrew
[64256, 64335], # hebrew peresent
[1792, 1871], # syriac
[1920, 1983], # thaana
[1984, 2047], # nko
[11568, 11647] # tifinagh
]
limits.each do |limit|
return true if char >= limit[0] && char <= limit[1]
end
return false
end
end