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module MDUrl
module Encode
DEFAULT_CHARACTERS = ";/?:@&=+$,-_.!~*'()#"
COMPONENT_CHARACTERS = "-_.!~*'()"
@@encodeCache = {}
# Create a lookup array where anything but characters in `chars` string
# and alphanumeric chars is percent-encoded.
#------------------------------------------------------------------------------
def self.getEncodeCache(exclude)
cache = @@encodeCache[exclude]
return cache if (cache)
cache = @@encodeCache[exclude] = []
(0...128).each do |i|
ch = i.chr
if (/^[0-9a-z]$/i =~ ch)
# always allow unencoded alphanumeric characters
cache.push(ch)
else
cache.push('%' + ('0' + i.to_s(16).upcase).slice(-2, 2))
end
end
(0...exclude.length).each do |i|
cache[exclude[i].ord] = exclude[i]
end
return cache
end
# Encode unsafe characters with percent-encoding, skipping already
# encoded sequences.
#
# - string - string to encode
# - exclude - list of characters to ignore (in addition to a-zA-Z0-9)
# - keepEscaped - don't encode '%' in a correct escape sequence (default: true)
#------------------------------------------------------------------------------
def self.encode(string, exclude = nil, keepEscaped = nil)
result = ''
if !exclude.is_a? String
# encode(string, keepEscaped)
keepEscaped = exclude
exclude = DEFAULT_CHARACTERS
end
if keepEscaped == nil
keepEscaped = true
end
cache = getEncodeCache(exclude)
i = 0
l = string.length
while i < l
code = string[i].ord
if (keepEscaped && code == 0x25 && i + 2 < l) # %
if (/^[0-9a-f]{2}$/i =~ (string.slice((i + 1)...(i + 3))))
result += string.slice(i...(i + 3))
i += 3
next
end
end
if (code < 128)
result += cache[code]
i += 1
next
end
if (code >= 0xD800 && code <= 0xDFFF)
if (code >= 0xD800 && code <= 0xDBFF && i + 1 < l)
nextCode = string[i + 1].ord
if (nextCode >= 0xDC00 && nextCode <= 0xDFFF)
result += CGI::escape(string[i] + string[i + 1])
i += 2
next
end
end
result += '%EF%BF%BD'
i += 1
next
end
result += CGI::escape(string[i])
i += 1
end
return result
end
end
end
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