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