Module: Alt::URI::Algorithm

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

Class Method Summary collapse

Class Method Details

.authority_string(r) ⇒ Object 



79
80
81
82
83
 
# File 'lib/rio/alturi/algorithm.rb', line 79

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

.defined(el) ⇒ Object 



85
86
87
 
# File 'lib/rio/alturi/algorithm.rb', line 85

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

.dump_bufs(inp, out) ⇒ Object 



264
265
266
 
# File 'lib/rio/alturi/algorithm.rb', line 264

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

.merge(base, r) ⇒ Object 



156
157
158
159
160
161
162
163
164
165
166
 
# File 'lib/rio/alturi/algorithm.rb', line 156

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 



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# 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 



5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
 
# 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.



210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
 
# File 'lib/rio/alturi/algorithm.rb', line 210

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 



268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
 
# File 'lib/rio/alturi/algorithm.rb', line 268

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 



89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
 
# File 'lib/rio/alturi/algorithm.rb', line 89

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

return result



71
72
73
74
75
76
77
 
# File 'lib/rio/alturi/algorithm.rb', line 71

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