Module: Alt::URI::Algorithm

Defined in:
lib/rio/alturi/algorithm.rb

Class Method Summary collapse

Class Method Details

.authority_string(r) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 90

def self.authority_string(r)
  ( defined(r.userinfo) ? r.userinfo + "@"  : "") + 
    r.host +
    ( defined(r.port) ? ":" + r.port : "") 
end

.defined(el) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 99

def self.defined(el)
  !el.nil?
end

.dump_bufs(inp, out) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 278

def self.dump_bufs(inp,out)
  #printf("inp:[%-15s]  out:[%-15s]\n",inp,out)
end

.merge(base, r) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 170

def self.merge(base,r)
  if defined(base.authority) and base.path.empty?
    "/"
  else
    if npos = base.path.rindex("/")
      base.path[0,npos+1]
    else
      ""
    end
  end + r.path
end

.rel_path(path, base) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 22

def self.rel_path(path,base)
  bs = base.split("/",-1)
  pa = path.split("/",-1)
  bsize = bs.size
  psize = pa.size
  out = []
  (0...[bsize,psize].min).each do |i|
    out[0] = pa[i]
    if bs[i] != pa[i]
      i += 1
      out.unshift(*([".."] * (bsize - i)))
      out += pa[i,psize-1]
      return out.join("/")
    end
  end
  if bsize > psize
    out.unshift(*([".."] * (bsize - psize)))
  elsif psize > bsize
    out += pa[bsize,psize-bsize]
  end
  return out.join("/")
end

.relative(t, base) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 5

def self.relative(t,base)
  r = t.class.new
  if t.scheme != base.scheme
    r = t
  else
    if t.authority != base.authority
      r = t
    else
      r.path = rel_path(t.path,base.path)
      r.path = "." if r.path.empty?
      r.query = t.query
      r.fragment = t.fragment
    end
  end
  return r 
end

.remove_dot_segments(instr) ⇒ Object

  1. Finally, the output buffer is returned as the result of

    remove_dot_segments.



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# File 'lib/rio/alturi/algorithm.rb', line 224

def self.remove_dot_segments(instr)
  #    1.  The input buffer is initialized with the now-appended path
  #        components and the output buffer is initialized to the empty
  #        string.
  inp = instr.dup
  out = ""

  #    2.  While the input buffer is not empty, loop as follows:
  while !inp.empty?

    #        A.  If the input buffer begins with a prefix of "../" or "./",
    #            then remove that prefix from the input buffer; otherwise,
    unless inp.sub!( %r'^\.\.?/' , '')

      #        B.  if the input buffer begins with a prefix of "/./" or "/.",
      #            where "." is a complete path segment, then replace that
      #            prefix with "/" in the input buffer; otherwise,
      unless inp.sub!( %r'^/\.(/|\Z)' ,"/" )#

        #        C.  if the input buffer begins with a prefix of "/../" or "/..",
        #            where ".." is a complete path segment, then replace that
        #            prefix with "/" in the input buffer and remove the last
        #            segment and its preceding "/" (if any) from the output
        #            buffer; otherwise,
        if inp.sub!( %r'^/\.\.(/|\Z)' ,"/" )
          out.sub!(%r'/?[^/]*\Z',"")
        else

          #        D.  if the input buffer consists only of "." or "..", then remove
          #            that from the input buffer; otherwise,
          unless inp.sub!( /^\.\.?$/, "")

            #        E.  move the first path segment in the input buffer to the end of
            #            the output buffer, including the initial "/" character (if
            #            any) and any subsequent characters up to, but not including,
            #            the next "/" character or the end of the input buffer.
            inp.sub!( %r'^(/?[^/]*)' ) { |match|
              out << match
              ""
            }
            
          end
        end
      end
    end
  end

  #    3.  Finally, the output buffer is returned as the result of
  #        remove_dot_segments.
  out

end

.remove_dot_segments0(inp) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 282

def self.remove_dot_segments0(inp)
  out = ""
  while !inp.empty?
    unless inp.sub!( %r'^\.\.?/' , "")
      unless inp.sub!( %r'^/\.(/|\Z)' ,"/" )
        if inp.sub!( %r'^/\.\.(/|\Z)' ,"/" )
          out.sub!(%r'/?[^/]*\Z',"")
        else
          unless inp.sub!( /^\.\.?$/, "")
            inp.sub!( %r'^(/?[^/]*)' ) { |match|
              out << match
              ""
            }
            
          end
        end
      end
    end
  end
  out
end

.transform(r, base, strict = true) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 103

def self.transform(r,base,strict=true)

  #-- A non-strict parser may ignore a scheme in the reference
  #-- if it is identical to the base URI's scheme.
  #--
  if ((not strict) and (r.scheme == base.scheme))
    r.scheme = nil
  end

  t = r.class.new
  if defined(r.scheme) 
    t.scheme    = r.scheme;
    t.authority = r.authority;
    t.path      = remove_dot_segments(r.path);
    t.query     = r.query;
  else
    if defined(r.authority) 
      t.authority = r.authority;
      t.path      = remove_dot_segments(r.path);
      t.query     = r.query;
    else
      if (r.path == "") 
        t.path = base.path;
        
        if defined(r.query)
          t.query = r.query;
        else
          t.query = base.query;
        end
      else
        if (r.path.start_with?("/")) then
          t.path = remove_dot_segments(r.path);
        else
          t.path = merge(base, r);
          t.path = remove_dot_segments(t.path);
        end
        t.query = r.query;
      end
      t.authority = base.authority;
    end
    t.scheme = base.scheme;
  end
  t.fragment = r.fragment;

  return t
end

.uri_string(r) ⇒ Object 



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# File 'lib/rio/alturi/algorithm.rb', line 83

def self.uri_string(r)
  ( defined(r.scheme) ? r.scheme + ":"  : "") + 
    ( defined(r.authority) ? "//" + r.authority : "") + 
    r.path +
    ( defined(r.query) ? "?" + r.query : "") +
    ( defined(r.fragment) ? "#" + r.fragment : "") 
end