summaryrefslogtreecommitdiff
path: root/jni/ruby/lib/rexml/functions.rb
blob: 2010be14e0179a3b82b0f6cabe3d1a8a250d675d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
module REXML
  # If you add a method, keep in mind two things:
  # (1) the first argument will always be a list of nodes from which to
  # filter.  In the case of context methods (such as position), the function
  # should return an array with a value for each child in the array.
  # (2) all method calls from XML will have "-" replaced with "_".
  # Therefore, in XML, "local-name()" is identical (and actually becomes)
  # "local_name()"
  module Functions
    @@context = nil
    @@namespace_context = {}
    @@variables = {}

    def Functions::namespace_context=(x) ; @@namespace_context=x ; end
    def Functions::variables=(x) ; @@variables=x ; end
    def Functions::namespace_context ; @@namespace_context ; end
    def Functions::variables ; @@variables ; end

    def Functions::context=(value); @@context = value; end

    def Functions::text( )
      if @@context[:node].node_type == :element
        return @@context[:node].find_all{|n| n.node_type == :text}.collect{|n| n.value}
      elsif @@context[:node].node_type == :text
        return @@context[:node].value
      else
        return false
      end
    end

    # Returns the last node of the given list of nodes.
    def Functions::last( )
      @@context[:size]
    end

    def Functions::position( )
      @@context[:index]
    end

    # Returns the size of the given list of nodes.
    def Functions::count( node_set )
      node_set.size
    end

    # Since REXML is non-validating, this method is not implemented as it
    # requires a DTD
    def Functions::id( object )
    end

    # UNTESTED
    def Functions::local_name( node_set=nil )
      get_namespace( node_set ) do |node|
        return node.local_name
      end
    end

    def Functions::namespace_uri( node_set=nil )
      get_namespace( node_set ) {|node| node.namespace}
    end

    def Functions::name( node_set=nil )
      get_namespace( node_set ) do |node|
        node.expanded_name
      end
    end

    # Helper method.
    def Functions::get_namespace( node_set = nil )
      if node_set == nil
        yield @@context[:node] if defined? @@context[:node].namespace
      else
        if node_set.respond_to? :each
          node_set.each { |node| yield node if defined? node.namespace }
        elsif node_set.respond_to? :namespace
          yield node_set
        end
      end
    end

    # A node-set is converted to a string by returning the string-value of the
    # node in the node-set that is first in document order. If the node-set is
    # empty, an empty string is returned.
    #
    # A number is converted to a string as follows
    #
    # NaN is converted to the string NaN
    #
    # positive zero is converted to the string 0
    #
    # negative zero is converted to the string 0
    #
    # positive infinity is converted to the string Infinity
    #
    # negative infinity is converted to the string -Infinity
    #
    # if the number is an integer, the number is represented in decimal form
    # as a Number with no decimal point and no leading zeros, preceded by a
    # minus sign (-) if the number is negative
    #
    # otherwise, the number is represented in decimal form as a Number
    # including a decimal point with at least one digit before the decimal
    # point and at least one digit after the decimal point, preceded by a
    # minus sign (-) if the number is negative; there must be no leading zeros
    # before the decimal point apart possibly from the one required digit
    # immediately before the decimal point; beyond the one required digit
    # after the decimal point there must be as many, but only as many, more
    # digits as are needed to uniquely distinguish the number from all other
    # IEEE 754 numeric values.
    #
    # The boolean false value is converted to the string false. The boolean
    # true value is converted to the string true.
    #
    # An object of a type other than the four basic types is converted to a
    # string in a way that is dependent on that type.
    def Functions::string( object=nil )
      #object = @context unless object
      if object.instance_of? Array
        string( object[0] )
      elsif defined? object.node_type
        if object.node_type == :attribute
          object.value
        elsif object.node_type == :element || object.node_type == :document
          string_value(object)
        else
          object.to_s
        end
      elsif object.nil?
        return ""
      else
        object.to_s
      end
    end

    # A node-set is converted to a string by
    # returning the concatenation of the string-value
    # of each of the children of the node in the
    # node-set that is first in document order.
    # If the node-set is empty, an empty string is returned.
    def Functions::string_value( o )
      rv = ""
      o.children.each { |e|
        if e.node_type == :text
          rv << e.to_s
        elsif e.node_type == :element
          rv << string_value( e )
        end
      }
      rv
    end

    # UNTESTED
    def Functions::concat( *objects )
      objects.join
    end

    # Fixed by Mike Stok
    def Functions::starts_with( string, test )
      string(string).index(string(test)) == 0
    end

    # Fixed by Mike Stok
    def Functions::contains( string, test )
      string(string).include?(string(test))
    end

    # Kouhei fixed this
    def Functions::substring_before( string, test )
      ruby_string = string(string)
      ruby_index = ruby_string.index(string(test))
      if ruby_index.nil?
        ""
      else
        ruby_string[ 0...ruby_index ]
      end
    end

    # Kouhei fixed this too
    def Functions::substring_after( string, test )
      ruby_string = string(string)
      return $1 if ruby_string =~ /#{test}(.*)/
      ""
    end

    # Take equal portions of Mike Stok and Sean Russell; mix
    # vigorously, and pour into a tall, chilled glass.  Serves 10,000.
    def Functions::substring( string, start, length=nil )
      ruby_string = string(string)
      ruby_length = if length.nil?
                      ruby_string.length.to_f
                    else
                      number(length)
                    end
      ruby_start = number(start)

      # Handle the special cases
      return '' if (
        ruby_length.nan? or
        ruby_start.nan? or
        ruby_start.infinite?
      )

      infinite_length = ruby_length.infinite? == 1
      ruby_length = ruby_string.length if infinite_length

      # Now, get the bounds.  The XPath bounds are 1..length; the ruby bounds
      # are 0..length.  Therefore, we have to offset the bounds by one.
      ruby_start = ruby_start.round - 1
      ruby_length = ruby_length.round

      if ruby_start < 0
       ruby_length += ruby_start unless infinite_length
       ruby_start = 0
      end
      return '' if ruby_length <= 0
      ruby_string[ruby_start,ruby_length]
    end

    # UNTESTED
    def Functions::string_length( string )
      string(string).length
    end

    # UNTESTED
    def Functions::normalize_space( string=nil )
      string = string(@@context[:node]) if string.nil?
      if string.kind_of? Array
        string.collect{|x| string.to_s.strip.gsub(/\s+/um, ' ') if string}
      else
        string.to_s.strip.gsub(/\s+/um, ' ')
      end
    end

    # This is entirely Mike Stok's beast
    def Functions::translate( string, tr1, tr2 )
      from = string(tr1)
      to = string(tr2)

      # the map is our translation table.
      #
      # if a character occurs more than once in the
      # from string then we ignore the second &
      # subsequent mappings
      #
      # if a character maps to nil then we delete it
      # in the output.  This happens if the from
      # string is longer than the to string
      #
      # there's nothing about - or ^ being special in
      # http://www.w3.org/TR/xpath#function-translate
      # so we don't build ranges or negated classes

      map = Hash.new
      0.upto(from.length - 1) { |pos|
        from_char = from[pos]
        unless map.has_key? from_char
          map[from_char] =
          if pos < to.length
            to[pos]
          else
            nil
          end
        end
      }

      if ''.respond_to? :chars
        string(string).chars.collect { |c|
          if map.has_key? c then map[c] else c end
        }.compact.join
      else
        string(string).unpack('U*').collect { |c|
          if map.has_key? c then map[c] else c end
        }.compact.pack('U*')
      end
    end

    # UNTESTED
    def Functions::boolean( object=nil )
      if object.kind_of? String
        if object =~ /\d+/u
          return object.to_f != 0
        else
          return object.size > 0
        end
      elsif object.kind_of? Array
        object = object.find{|x| x and true}
      end
      return object ? true : false
    end

    # UNTESTED
    def Functions::not( object )
      not boolean( object )
    end

    # UNTESTED
    def Functions::true( )
      true
    end

    # UNTESTED
    def Functions::false(  )
      false
    end

    # UNTESTED
    def Functions::lang( language )
      lang = false
      node = @@context[:node]
      attr = nil
      until node.nil?
        if node.node_type == :element
          attr = node.attributes["xml:lang"]
          unless attr.nil?
            lang = compare_language(string(language), attr)
            break
          else
          end
        end
        node = node.parent
      end
      lang
    end

    def Functions::compare_language lang1, lang2
      lang2.downcase.index(lang1.downcase) == 0
    end

    # a string that consists of optional whitespace followed by an optional
    # minus sign followed by a Number followed by whitespace is converted to
    # the IEEE 754 number that is nearest (according to the IEEE 754
    # round-to-nearest rule) to the mathematical value represented by the
    # string; any other string is converted to NaN
    #
    # boolean true is converted to 1; boolean false is converted to 0
    #
    # a node-set is first converted to a string as if by a call to the string
    # function and then converted in the same way as a string argument
    #
    # an object of a type other than the four basic types is converted to a
    # number in a way that is dependent on that type
    def Functions::number( object=nil )
      object = @@context[:node] unless object
      case object
      when true
        Float(1)
      when false
        Float(0)
      when Array
        number(string( object ))
      when Numeric
        object.to_f
      else
        str = string( object )
        # If XPath ever gets scientific notation...
        #if str =~ /^\s*-?(\d*\.?\d+|\d+\.)([Ee]\d*)?\s*$/
        if str =~ /^\s*-?(\d*\.?\d+|\d+\.)\s*$/
          str.to_f
        else
          (0.0 / 0.0)
        end
      end
    end

    def Functions::sum( nodes )
      nodes = [nodes] unless nodes.kind_of? Array
      nodes.inject(0) { |r,n| r + number(string(n)) }
    end

    def Functions::floor( number )
      number(number).floor
    end

    def Functions::ceiling( number )
      number(number).ceil
    end

    def Functions::round( number )
      begin
        number(number).round
      rescue FloatDomainError
        number(number)
      end
    end

    def Functions::processing_instruction( node )
      node.node_type == :processing_instruction
    end

    def Functions::method_missing( id )
      puts "METHOD MISSING #{id.id2name}"
      XPath.match( @@context[:node], id.id2name )
    end
  end
end