Class: Negotiator

Inherits:
Object
  • Object
show all
Defined in:
lib/negotiator.rb

Constant Summary collapse

VERSION = 
"0.1"

Class Method Summary collapse

Class Method Details

.parse(h) ⇒ Object 



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# File 'lib/negotiator.rb', line 35

def self.parse(h)
  if !h
    h = "*/*"
  end

  qual = [{}, {}, 0.0]
  p = h.split(/,\s*/)
  for s in p
    t, st, q = parse_media_range(s)

    case true
    when t == "*"
      qual[2] = q
    when st == "*"
      qual[1][t] = q
    else
      qual[0]["#{t}/#{st}"] = q
    end
  end
  qual
end

.parse_media_range(s) ⇒ Object 



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# File 'lib/negotiator.rb', line 57

def self.parse_media_range(s)
  q = 1.0
  if s[";"]
    s, qs = s.split(/;\s*/)
    if qs.index("q=") == 0
      q = Float(qs[2,qs.length])
    end
  end

  t, st = s.split(/\//)
  return t, st, q
end

.pick(h, o) ⇒ Object 



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# File 'lib/negotiator.rb', line 4

def self.pick(h, o)
  r = parse(h)
  cand = []
  for s, q in o
    st = s.split(/\//)[0]
    case true
    when r[0].include?(s)
      q *= r[0][s]
    when r[1].include?(st)
      q *= r[1][st]
    else
      q *= r[2]
    end
    if q > 0
      cand << [s, q]
    end
  end

  if cand.empty?
    return nil
  end

  best = cand[0]
  for s, q in cand
    if q > best[1]
      best = [s, q]
    end
  end
  return best[0]
end