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require 'uri'
# Class representing one patch operation.
class PatchObj
attr_accessor :start1, :start2
attr_accessor :length1, :length2
attr_accessor :diffs
ENCODE_REGEX = %r{[^0-9A-Za-z_.;!~*'(),/?:@&=+$\#-]}
ESCAPED = /%[a-fA-F\d]{2}/
def self.uri_encode(str, unsafe = ENCODE_REGEX)
unless unsafe.is_a?(Regexp)
unsafe = Regexp.new("[#{Regexp.quote(unsafe)}]", false)
end
str.gsub(unsafe) do
us = ::Regexp.last_match(0)
tmp = ''
us.each_byte do |uc|
tmp << format('%%%02X', uc)
end
tmp
end.force_encoding(Encoding::US_ASCII)
end
def self.uri_decode(str)
enc = str.encoding
enc = Encoding::UTF_8 if enc == Encoding::US_ASCII
str.gsub(ESCAPED) { [::Regexp.last_match(0)[1, 2]].pack('H2').force_encoding(enc) }
end
def initialize
# Initializes with an empty list of diffs.
@start1 = nil
@start2 = nil
@length1 = 0
@length2 = 0
@diffs = []
end
# Emulate GNU diff's format
# Header: @@ -382,8 +481,9 @@
# Indices are printed as 1-based, not 0-based.
def to_s
if length1 == 0
coords1 = start1.to_s + ",0"
elsif length1 == 1
coords1 = (start1 + 1).to_s
else
coords1 = (start1 + 1).to_s + "," + length1.to_s
end
if length2 == 0
coords2 = start2.to_s + ",0"
elsif length2 == 1
coords2 = (start2 + 1).to_s
else
coords2 = (start2 + 1).to_s + "," + length2.to_s
end
text = '@@ -' + coords1 + ' +' + coords2 + " @@\n"
# Encode the body of the patch with %xx notation.
text += diffs.map do |op, data|
op = case op
when :insert; '+'
when :delete; '-'
when :equal ; ' '
end
op + PatchObj.uri_encode(data, /[^0-9A-Za-z_.;!~*'(),\/?:@&=+$\#-]/) + "\n"
end.join.gsub('%20', ' ')
return text
end
end
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