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module REXML
module Encoding
# ID ---> Encoding object
attr_reader :encoding
def encoding=(encoding)
if encoding.is_a?(String)
original_encoding = encoding
encoding = find_encoding(encoding)
unless encoding
raise ArgumentError, "Bad encoding name #{original_encoding}"
end
end
return false if defined?(@encoding) and encoding == @encoding
if encoding and encoding != ::Encoding::UTF_8
@encoding = encoding
else
@encoding = ::Encoding::UTF_8
end
true
end
def check_encoding(xml)
# We have to recognize UTF-16, LSB UTF-16, and UTF-8
if xml[0, 2] == "\xfe\xff"
xml[0, 2] = ""
::Encoding::UTF_16BE
elsif xml[0, 2] == "\xff\xfe"
xml[0, 2] = ""
::Encoding::UTF_16LE
else
if /\A\s*<\?xml\s+version\s*=\s*(['"]).*?\1
\s+encoding\s*=\s*(["'])(.*?)\2/mx =~ xml
encoding_name = $3
if /\Autf-16\z/i =~ encoding_name
::Encoding::UTF_16BE
else
find_encoding(encoding_name)
end
else
::Encoding::UTF_8
end
end
end
def encode(string)
string.encode(@encoding)
end
def decode(string)
string.encode(::Encoding::UTF_8, @encoding)
end
private
def find_encoding(name)
case name
when "UTF-16"
name = "UTF-16BE"
when /\Ashift-jis\z/i
name = "Shift_JIS"
when /\ACP-(\d+)\z/
name = "CP#{$1}"
end
::Encoding.find(name)
end
end
end
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