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module MDUrl
module Decode
@@decodeCache = {};
DEFTAULT_CHARS = ';/?:@&=+$,#'
COMPONENT_CHARS = ''
#------------------------------------------------------------------------------
def self.getDecodeCache(exclude)
cache = @@decodeCache[exclude]
return cache if (cache)
cache = @@decodeCache[exclude] = []
(0...128).each do |i|
ch = i.chr
cache.push(ch)
end
(0...exclude.length).each do |i|
ch = exclude[i].ord
cache[ch] = '%' + ('0' + ch.to_s(16).upcase).slice(-2, 2)
end
return cache
end
# Decode percent-encoded string.
#------------------------------------------------------------------------------
def self.decode(string, exclude = nil)
if !exclude.is_a? String
exclude = DEFTAULT_CHARS
end
cache = getDecodeCache(exclude)
return string.gsub(/(%[a-f0-9]{2})+/i) do |seq|
result = ''
i = 0
l = seq.length
while i < l
b1 = seq.slice((i + 1)...(i + 3)).to_i(16)
if (b1 < 0x80)
result += cache[b1]
i += 3
next
end
if ((b1 & 0xE0) == 0xC0 && (i + 3 < l))
# 110xxxxx 10xxxxxx
b2 = seq.slice((i + 4)...(i + 6)).to_i(16)
if ((b2 & 0xC0) == 0x80)
char = ((b1 << 6) & 0x7C0) | (b2 & 0x3F)
if (char < 0x80)
result += "\ufffd\ufffd"
else
result += char.chr(Encoding::UTF_8)
end
i += 6
next
end
end
if ((b1 & 0xF0) == 0xE0 && (i + 6 < l))
# 1110xxxx 10xxxxxx 10xxxxxx
b2 = seq.slice((i + 4)...(i + 6)).to_i(16)
b3 = seq.slice((i + 7)...(i + 9)).to_i(16)
if ((b2 & 0xC0) == 0x80 && (b3 & 0xC0) == 0x80)
char = ((b1 << 12) & 0xF000) | ((b2 << 6) & 0xFC0) | (b3 & 0x3F)
if (char < 0x800 || (char >= 0xD800 && char <= 0xDFFF))
result += "\ufffd\ufffd\ufffd"
else
result += char.chr(Encoding::UTF_8)
end
i += 9
next
end
end
if ((b1 & 0xF8) == 0xF0 && (i + 9 < l))
# 111110xx 10xxxxxx 10xxxxxx 10xxxxxx
b2 = seq.slice((i + 4)...(i + 6)).to_i(16)
b3 = seq.slice((i + 7)...(i + 9)).to_i(16)
b4 = seq.slice((i + 10)...(i + 12)).to_i(16)
if ((b2 & 0xC0) == 0x80 && (b3 & 0xC0) == 0x80 && (b4 & 0xC0) == 0x80)
char = ((b1 << 18) & 0x1C0000) | ((b2 << 12) & 0x3F000) | ((b3 << 6) & 0xFC0) | (b4 & 0x3F)
if (char < 0x10000 || char > 0x10FFFF)
result += "\ufffd\ufffd\ufffd\ufffd"
else
# TODO don't know how to handle surrogate pairs properly.
char -= 0x10000
result += [0xD800 + (char >> 10), 0xDC00 + (char & 0x3FF)].map{|c| c.chr(Encoding::UTF_8)}.join
# high = ((char - 0x10000) / 0x400).floor + 0xD800
# low = ((char - 0x10000) % 0x400) + 0xDC00
# result += '\u' + [high, low].map { |x| x.to_s(16) }.join('\u').downcase
end
i += 12
next
end
end
result += "\ufffd"
i += 3
end
result
end
end
end
end
# https://gist.github.com/kreeger/4480326
# class Fixnum
# def to_surrogate_pair
# if self >= 0x10000 && self <= 0x10FFFF
# high = ((self - 0x10000) / 0x400).floor + 0xD800
# low = ((self - 0x10000) % 0x400) + 0xDC00
# end
# '\U' + [high, low].map { |x| x.to_s(16) }.join('\U').upcase
# end
#
# end
#
# class String
# def to_hex
# self.gsub('\U000', '0x').to_i(16)
# end
# end
#
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