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