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module Rack::Accept
# Represents an HTTP Accept-Charset header according to the HTTP 1.1
# specification, and provides several convenience methods for determining
# acceptable character sets.
#
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.2
class Charset
include Header
# The name of this header.
def name
'Accept-Charset'
end
# Determines the quality factor (qvalue) of the given +charset+.
def qvalue(charset)
m = matches(charset)
if m.empty?
charset == 'iso-8859-1' ? 1 : 0
else
normalize_qvalue(@qvalues[m.first])
end
end
# Returns an array of character sets from this header that match the given
# +charset+, ordered by precedence.
def matches(charset)
values.select {|v|
v == charset || v == '*'
}.sort {|a, b|
# "*" gets least precedence, any others should be equal.
a == '*' ? 1 : (b == '*' ? -1 : 0)
}
end
end
end
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