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module Rack::Accept
# Represents an HTTP Accept-Language header according to the HTTP 1.1
# specification, and provides several convenience methods for determining
# acceptable content languages.
#
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4
class Language
include Header
attr_writer :first_level_match
# The name of this header.
def name
'Accept-Language'
end
# Determines the quality factor (qvalue) of the given +language+.
def qvalue(language)
return 1 if @qvalues.empty?
m = matches(language)
return 0 if m.empty?
normalize_qvalue(@qvalues[m.first])
end
# Returns an array of languages from this header that match the given
# +language+, ordered by precedence.
def matches(language)
values.select {|v|
v = v.match(/^(.+?)-/) ? $1 : v if @first_level_match
v == language || v == '*' || (language.match(/^(.+?)-/) && v == $1)
}.sort {|a, b|
# "*" gets least precedence, any others are compared based on length.
a == '*' ? -1 : (b == '*' ? 1 : a.length <=> b.length)
}.reverse
end
end
end
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