instiki/attic/vendor/plugins/HTML5lib/lib/html5/sniffer.rb

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module HTML5
module Sniffer
# 4.7.4
def html_or_feed str
s = str[0, 512] # steps 1, 2
pos = 0
while pos < s.length
case s[pos]
when ?\t, ?\ , ?\n, ?\r # 0x09, 0x20, 0x0A, 0x0D == tab, space, LF, CR
pos += 1
when ?< # 0x3C
pos += 1
if s[pos..pos+2] == "!--" # [0x21, 0x2D, 0x2D]
pos += 3
until s[pos..pos+2] == "-->" or pos >= s.length
pos += 1
end
pos += 3
elsif s[pos] == ?! # 0x21
pos += 1
until s[pos] == ?> or pos >= s.length # 0x3E
pos += 1
end
pos += 1
elsif s[pos] == ?? # 0x3F
until s[pos..pos+1] == "?>" or pos >= s.length # [0x3F, 0x3E]
pos += 1
end
pos += 2
elsif s[pos..pos+2] == "rss" # [0x72, 0x73, 0x73]
return "application/rss+xml"
elsif s[pos..pos+3] == "feed" # [0x66, 0x65, 0x65, 0x64]
return "application/atom+xml"
elsif s[pos..pos+6] == "rdf:RDF" # [0x72, 0x64, 0x66, 0x3A, 0x52, 0x44, 0x46]
raise NotImplementedError
end
else
break
end
end
"text/html"
end
end
end