/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classification.py
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revision 385 by jonathan, Mon Feb 3 11:43:56 2003 UTC revision 1912 by bh, Mon Nov 3 13:55:41 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
4  #  #
# Line 13  to data. This mapping can be specified i Line 13  to data. This mapping can be specified i
13  First, specific values can be associated with data.  First, specific values can be associated with data.
14  Second, ranges can be associated with data such that if  Second, ranges can be associated with data such that if
15  an input value falls with a range that data is returned.  an input value falls with a range that data is returned.
16  If no mapping can be found then a NullData data will  If no mapping can be found then default data will
17  be returned. Input values must be hashable objects  be returned. Input values must be hashable objects
18    
19  See the description of getProperties() for more information  See the description of FindGroup() for more information
20  on the mapping algorithm.  on the mapping algorithm.
21  """  """
22        
23    import copy, operator, types
24    
25  from Thuban import _  from Thuban import _
 from Thuban.Model.color import Color  
26    
27  from wxPython.wx import *  from messages import \
28        LAYER_PROJECTION_CHANGED, \
29        LAYER_LEGEND_CHANGED, \
30        LAYER_VISIBILITY_CHANGED,\
31        CLASS_CHANGED
32    
33    from Thuban.Model.color import Color, Transparent, Black
34    from Thuban.Model.range import Range
35    
36    import Thuban.Model.layer
37    
38    from Thuban.Lib.connector import Publisher
39    
40    class Classification(Publisher):
41        """Encapsulates the classification of layer.
42        
43        The Classification divides some kind of data into Groups which
44        are associated with properties. Later the properties can be
45        retrieved by matching data values to the appropriate group.
46        """
47    
48        def __init__(self):
49            """Initialize a classification."""
50    
51            self.__groups = []
52    
53            self.SetDefaultGroup(ClassGroupDefault())
54    
55        def __iter__(self):
56            return ClassIterator(self.__groups)
57    
58        def __deepcopy__(self, memo):
59            clazz = Classification()
60    
61            clazz.__groups[0] = copy.deepcopy(self.__groups[0])
62    
63            for i in range(1, len(self.__groups)):
64                clazz.__groups.append(copy.deepcopy(self.__groups[i]))
65    
66            return clazz
67    
68        def __SendNotification(self):
69            """Notify the layer that this class has changed."""
70            self.issue(CLASS_CHANGED)
71    
72        def __getattr__(self, attr):
73            """Generate the compiled classification on demand"""
74            if attr == "_compiled_classification":
75                self._compile_classification()
76                return self._compiled_classification
77            raise AttributeError(attr)
78    
79  # constants      def _compile_classification(self):
80  RANGE_MIN  = 0          """Generate the compiled classification
 RANGE_MAX  = 1  
 RANGE_DATA = 2  
81    
82  class Classification:          The compiled classification is a more compact representation of
83            the classification groups that is also more efficient for
84            performing the classification.
85    
86            The compiled classification is a list of tuples. The first
87            element of the tuple is a string which describes the rest of the
88            tuple. There are two kinds of tuples:
89    
90      def __init__(self, field = None):            'singletons'
         """Initialize a classification.  
91    
92             field -- the name of the data table field that              The second element of the tuple is a dictionary which
93                      is to be used to classify layer properties              combines several consecutive ClassGroupSingleton instances.
94                The dictionary maps the values of the singletons (as
95                returned by the GetValue() method) to the corresponding
96                group.
97    
98              'range'
99    
100                The tuple describes a ClassGroupRange instance. The tuples
101                second element is a tuple fo the form (lfunc, min, max,
102                rfunc, group) where group is the original group object,
103                lfunc and rfuct are comparison functions and min and max are
104                lower and upper bounds of the range. Given a value and such
105                a tuple the group matches if and only if
106    
107                    lfunc(min, value) and rfunc(max, value)
108    
109                is true.
110    
111            The compiled classification is bound to
112            self._compile_classification.
113          """          """
114            compiled = []
115          self.points = {}          for group in self.__groups[1:]:
116          self.ranges = []              if isinstance(group, ClassGroupSingleton):
117          self.setField(field)                  if not compiled or compiled[-1][0] != "singletons":
118          self.setNull(None)                      compiled.append(("singletons", {}))
119                    compiled[-1][1].setdefault(group.GetValue(), group)
120                elif isinstance(group, ClassGroupRange):
121                    left, min, max, right = group.GetRangeTuple()
122                    if left == "[":
123                        lfunc = operator.le
124                    elif left == "]":
125                        lfunc = operator.lt
126                    if right == "[":
127                        rfunc = operator.gt
128                    elif right == "]":
129                        rfunc = operator.ge
130                    compiled.append(("range", (lfunc, min, max, rfunc, group)))
131                else:
132                    raise TypeError("Unknown group type %s", group)
133            self._compiled_classification = compiled
134    
135        def _clear_compiled_classification(self):
136            """Reset the compiled classification.
137    
138            If will be created on demand when self._compiled_classification
139            is accessed again.
140    
141            Call this method whenever self.__groups is modified.
142            """
143            try:
144                del self._compiled_classification
145            except:
146                pass
147    
148        #
149        # these SetDefault* methods are really only provided for
150        # some backward compatibility. they should be considered
151        # for removal once all the classification code is finished.
152        #
153    
154        def SetDefaultFill(self, fill):
155            """Set the default fill color.
156    
157            fill -- a Color object.
158            """
159            self.GetDefaultGroup().GetProperties().SetFill(fill)
160            self.__SendNotification()
161            
162        def GetDefaultFill(self):
163            """Return the default fill color."""
164            return self.GetDefaultGroup().GetProperties().GetFill()
165            
166        def SetDefaultLineColor(self, color):
167            """Set the default line color.
168    
169            color -- a Color object.
170            """
171            self.GetDefaultGroup().GetProperties().SetLineColor(color)
172            self.__SendNotification()
173            
174        def GetDefaultLineColor(self):
175            """Return the default line color."""
176            return self.GetDefaultGroup().GetProperties().GetLineColor()
177                    
178      def setField(self, field):      def SetDefaultLineWidth(self, lineWidth):
179          """Set the name of the data table field to use.          """Set the default line width.
180            
181             field -- if None then all values map to NullData          lineWidth -- an integer > 0.
182          """          """
183            assert isinstance(lineWidth, types.IntType)
184            self.GetDefaultGroup().GetProperties().SetLineWidth(lineWidth)
185            self.__SendNotification()
186            
187        def GetDefaultLineWidth(self):
188            """Return the default line width."""
189            return self.GetDefaultGroup().GetProperties().GetLineWidth()
190            
191    
192          self.field = field      #
193        # The methods that manipulate self.__groups have to be kept in
194        # sync. We store the default group in index 0 to make it
195        # convienent to iterate over the classification's groups, but
196        # from the user's perspective the first (non-default) group is
197        # at index 0 and the DefaultGroup is a special entity.
198        #
199    
200      def setNull(self, data):      def SetDefaultGroup(self, group):
201          """Set the data to be used when a value can't be classified.          """Set the group to be used when a value can't be classified.
202    
203             data -- data that the value maps to. See class description.          group -- group that the value maps to.
204          """          """
205            assert isinstance(group, ClassGroupDefault)
206            if len(self.__groups) > 0:
207                self.__groups[0] = group
208            else:
209                self.__groups.append(group)
210            self.__SendNotification()
211    
212        def GetDefaultGroup(self):
213            """Return the default group."""
214            return self.__groups[0]
215    
216        def AppendGroup(self, item):
217            """Append a new ClassGroup item to the classification.
218    
219            item -- this must be a valid ClassGroup object
220            """
221    
222            self.InsertGroup(self.GetNumGroups(), item)
223    
224          self.NullData = data      def InsertGroup(self, index, group):
225            assert isinstance(group, ClassGroup)
226            self.__groups.insert(index + 1, group)
227            self._clear_compiled_classification()
228            self.__SendNotification()
229    
230        def RemoveGroup(self, index):
231            """Remove the classification group with the given index"""
232            self.__groups.pop(index + 1)
233            self._clear_compiled_classification()
234            self.__SendNotification()
235    
236        def ReplaceGroup(self, index, group):
237            assert isinstance(group, ClassGroup)
238            self.__groups[index + 1] = group
239            self._clear_compiled_classification()
240            self.__SendNotification()
241    
242        def GetGroup(self, index):
243            return self.__groups[index + 1]
244    
245        def GetNumGroups(self):
246            """Return the number of non-default groups in the classification."""
247            return len(self.__groups) - 1
248    
249      def getNull(self):      def FindGroup(self, value):
250          return self.NullData          """Return the group that matches the value.
251    
252      def addRange(self, min, max, data):          Groups are effectively checked in the order the were added to
253          """Add a new range to the classification.          the Classification.
254    
255             A range allows a value to be classified if it falls between          value -- the value to classify. If there is no mapping or value
256             min and max. Specifically, min <= value < max                   is None, return the default properties
257                    """
258             min -- the lower bound.  
259            if value is not None:
260                for typ, params in self._compiled_classification:
261                    if typ == "singletons":
262                        group = params.get(value)
263                        if group is not None:
264                            return group
265                    elif typ == "range":
266                        lfunc, min, max, rfunc, g = params
267                        if lfunc(min, value) and rfunc(max, value):
268                            return g
269    
270             max -- the upper bound.          return self.GetDefaultGroup()
271    
272             data -- data that the value maps to. See class description.      def GetProperties(self, value):
273            """Return the properties associated with the given value.
274          
275            Use this function rather than Classification.FindGroup().GetProperties()
276            since the returned group may be a ClassGroupMap which doesn't support
277            a call to GetProperties().
278          """          """
279    
280          if min >= max:          group = self.FindGroup(value)
281              raise ValueError(_("Range minimum >= maximum!"))          if isinstance(group, ClassGroupMap):
282          self.ranges.append([min, max, data])              return group.GetPropertiesFromValue(value)
283            else:
284                return group.GetProperties()
285    
286        def TreeInfo(self):
287            items = []
288    
289            def build_color_item(text, color):
290                if color is Transparent:
291                    return ("%s: %s" % (text, _("None")), None)
292    
293                return ("%s: (%.3f, %.3f, %.3f)" %
294                        (text, color.red, color.green, color.blue),
295                        color)
296    
297            def build_item(group, string):
298                label = group.GetLabel()
299                if label == "":
300                    label = string
301                else:
302                    label += " (%s)" % string
303    
304                props = group.GetProperties()
305                i = []
306                v = props.GetLineColor()
307                i.append(build_color_item(_("Line Color"), v))
308                v = props.GetLineWidth()
309                i.append(_("Line Width: %s") % v)
310                v = props.GetFill()
311                i.append(build_color_item(_("Fill"), v))
312                return (label, i)
313    
314            for p in self:
315                items.append(build_item(p, p.GetDisplayText()))
316    
317      def addPoint(self, value, data):          return (_("Classification"), items)
318          """Associate a single value with data.  
319    class ClassIterator:
320        """Allows the Groups in a Classifcation to be interated over.
321    
322             When this value is to be classified data will be returned.      The items are returned in the following order:
323            default data, singletons, ranges, maps
324        """
325    
326             value -- classification value.      def __init__(self, data): #default, points, ranges, maps):
327            """Constructor.
328    
329             data  -- data that the value maps to. See class description.          default -- the default group
330    
331            points -- a list of singleton groups
332    
333            ranges -- a list of range groups
334    
335            maps -- a list of map groups
336          """          """
337    
338          self.points[value] = data          self.data = data
339            self.data_index = 0
340    
341      def getProperties(self, value):      def __iter__(self):
342          """Return the associated data, or the NullData.          return self
343    
344             The following search technique is used:      def next(self):
345                 (1) if the field is None, return NullData          """Return the next item."""
                (2) check if the value exists as a single value  
                (3) check if the value falls within a range. Ranges  
                    are checked in the order they were added to  
                    the classification.  
346    
347             value -- the value to classify. If there is no mapping          if self.data_index >= len(self.data):
348                      return the NullData (which may be None)              raise StopIteration
349            else:
350                d = self.data[self.data_index]
351                self.data_index += 1
352                return d
353            
354    class ClassGroupProperties:
355        """Represents the properties of a single Classification Group.
356      
357        These are used when rendering a layer."""
358    
359        def __init__(self, props = None):
360            """Constructor.
361    
362            props -- a ClassGroupProperties object. The class is copied if
363                     prop is not None. Otherwise, a default set of properties
364                     is created such that: line color = Black, line width = 1,
365                     and fill color = Transparent
366          """          """
367    
368          if self.field is not None:          if props is not None:
369              #              self.SetProperties(props)
370              # first check the discrete values          else:
371              #              self.SetLineColor(Black)
372              if self.points.has_key(value):              self.SetLineWidth(1)
373                  return self.points[value]              self.SetFill(Transparent)
374    
375        def SetProperties(self, props):
376            """Set this class's properties to those in class props."""
377    
378            assert isinstance(props, ClassGroupProperties)
379            self.SetLineColor(props.GetLineColor())
380            self.SetLineWidth(props.GetLineWidth())
381            self.SetFill(props.GetFill())
382            
383        def GetLineColor(self):
384            """Return the line color as a Color object."""
385            return self.__stroke
386    
387              #      def SetLineColor(self, color):
388              # now check the ranges          """Set the line color.
             #  
             for p in self.ranges:  
                 if (p[RANGE_MIN] <= value) and (value < p[RANGE_MAX]):  
                     return p[RANGE_DATA]  
389    
390            color -- the color of the line. This must be a Color object.
391            """
392    
393          return self.NullData          self.__stroke = color
394    
395      def TreeInfo(self):      def GetLineWidth(self):
396          items = []          """Return the line width."""
397            return self.__strokeWidth
398    
399        def SetLineWidth(self, lineWidth):
400            """Set the line width.
401    
402            lineWidth -- the new line width. This must be > 0.
403            """
404            assert isinstance(lineWidth, types.IntType)
405            if (lineWidth < 1):
406                raise ValueError(_("lineWidth < 1"))
407    
408            self.__strokeWidth = lineWidth
409    
410        def GetFill(self):
411            """Return the fill color as a Color object."""
412            return self.__fill
413    
414        def SetFill(self, fill):
415            """Set the fill color.
416    
417            fill -- the color of the fill. This must be a Color object.
418            """
419    
420            self.__fill = fill
421    
422        def __eq__(self, other):
423            """Return true if 'props' has the same attributes as this class"""
424    
425          #          #
426          # shouldn't print anything if there are no classifications          # using 'is' over '==' results in a huge performance gain
427            # in the renderer
428          #          #
429            return isinstance(other, ClassGroupProperties)   \
430                and (self.__stroke is other.__stroke or      \
431                     self.__stroke == other.__stroke)        \
432                and (self.__fill is other.__fill or          \
433                     self.__fill == other.__fill)            \
434                and self.__strokeWidth == other.__strokeWidth
435    
436                def __ne__(self, other):
437          def color_string(color):          return not self.__eq__(other)
             if color is None:  
                 return "None"  
             return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
438    
439          if self.NullData is not None:      def __copy__(self):
440              i = []          return ClassGroupProperties(self)
             for key, value in self.NullData.items():  
                 if isinstance(value, Color):  
                     i.append((_("%s: %s") % (key, color_string(value)), value))  
                 else:  
                     i.append(_("%s: %s") % (key, value))  
             items.append((_("'NULL'"), i))  
441    
442          for name, data in self.points.items():      def __deepcopy__(self):
443              i = []          return ClassGroupProperties(self)
             for key, value in data.items():  
                 if isinstance(value, Color):  
                     i.append((_("%s: %s") % (key, color_string(value)), value))  
                 else:  
                     i.append(_("%s: %s") % (key, value))  
             items.append((_("%s") % name, i))  
444    
445          for p in self.ranges:      def __repr__(self):
446              i = []          return repr((self.__stroke, self.__strokeWidth, self.__fill))
447              data = p[RANGE_DATA]  
448              for key, value in data.items():  class ClassGroup:
449                  if isinstance(value, Color):      """A base class for all Groups within a Classification"""
450                      i.append((_("%s: %s") % (key, color_string(value)), value))  
451                  else:      def __init__(self, label = "", props = None, group = None):
452                      i.append(_("%s: %s") % (key, value))          """Constructor.
453              items.append((_("%s-%s") % (p[RANGE_MIN], p[RANGE_MAX], i)))  
454                  label -- A string representing the Group's label
455          return (_("Classifications"), items)          """
456    
457            if group is not None:
458                self.SetLabel(copy.copy(group.GetLabel()))
459                self.SetProperties(copy.copy(group.GetProperties()))
460                self.SetVisible(group.IsVisible())
461            else:
462                self.SetLabel(label)
463                self.SetProperties(props)
464                self.SetVisible(True)
465    
466        def GetLabel(self):
467            """Return the Group's label."""
468            return self.label
469    
470        def SetLabel(self, label):
471            """Set the Group's label.
472    
473            label -- a string representing the Group's label. This must
474                     not be None.
475            """
476            assert isinstance(label, types.StringTypes)
477            self.label = label
478    
479        def GetDisplayText(self):
480            assert False, "GetDisplay must be overridden by subclass!"
481            return ""
482    
483        def Matches(self, value):
484            """Determines if this Group is associated with the given value.
485    
486            Returns False. This needs to be overridden by all subclasses.
487            """
488            assert False, "GetMatches must be overridden by subclass!"
489            return False
490    
491        def GetProperties(self):
492            """Return the properties associated with the given value."""
493    
494            return self.prop
495    
496        def SetProperties(self, prop):
497            """Set the properties associated with this Group.
498    
499            prop -- a ClassGroupProperties object. if prop is None,
500                    a default set of properties is created.
501            """
502    
503            if prop is None: prop = ClassGroupProperties()
504            assert isinstance(prop, ClassGroupProperties)
505            self.prop = prop
506    
507        def IsVisible(self):
508            return self.visible
509    
510        def SetVisible(self, visible):
511            self.visible = visible
512    
513        def __eq__(self, other):
514            return isinstance(other, ClassGroup) \
515                and self.label == other.label \
516                and self.GetProperties() == other.GetProperties()
517    
518        def __ne__(self, other):
519            return not self.__eq__(other)
520    
521        def __repr__(self):
522            return repr(self.label) + ", " + repr(self.GetProperties())
523        
524    class ClassGroupSingleton(ClassGroup):
525        """A Group that is associated with a single value."""
526    
527        def __init__(self, value = 0, props = None, label = "", group = None):
528            """Constructor.
529    
530            value -- the associated value.
531    
532            prop -- a ClassGroupProperites object. If prop is None a default
533                     set of properties is created.
534    
535            label -- a label for this group.
536            """
537            ClassGroup.__init__(self, label, props, group)
538    
539            self.SetValue(value)
540    
541        def __copy__(self):
542            return ClassGroupSingleton(self.GetValue(),
543                                       self.GetProperties(),
544                                       self.GetLabel())
545    
546        def __deepcopy__(self, memo):
547            return ClassGroupSingleton(self.GetValue(), group = self)
548    
549        def GetValue(self):
550            """Return the associated value."""
551            return self.__value
552    
553        def SetValue(self, value):
554            """Associate this Group with the given value."""
555            self.__value = value
556    
557        def Matches(self, value):
558            """Determine if the given value matches the associated Group value."""
559    
560            """Returns True if the value matches, False otherwise."""
561    
562            return self.__value == value
563    
564        def GetDisplayText(self):
565            label = self.GetLabel()
566    
567            if label != "": return label
568    
569            return str(self.GetValue())
570    
571        def __eq__(self, other):
572            return ClassGroup.__eq__(self, other) \
573                and isinstance(other, ClassGroupSingleton) \
574                and self.__value == other.__value
575    
576        def __repr__(self):
577            return "(" + repr(self.__value) + ", " + ClassGroup.__repr__(self) + ")"
578    
579    class ClassGroupDefault(ClassGroup):
580        """The default Group. When values do not match any other
581           Group within a Classification, the properties from this
582           class are used."""
583    
584        def __init__(self, props = None, label = "", group = None):
585            """Constructor.
586    
587            prop -- a ClassGroupProperites object. If prop is None a default
588                     set of properties is created.
589    
590            label -- a label for this group.
591            """
592    
593            ClassGroup.__init__(self, label, props, group)
594    
595        def __copy__(self):
596            return ClassGroupDefault(self.GetProperties(), self.GetLabel())
597    
598        def __deepcopy__(self, memo):
599            return ClassGroupDefault(label = self.GetLabel(), group = self)
600    
601        def Matches(self, value):
602            return True
603    
604        def GetDisplayText(self):
605            label = self.GetLabel()
606    
607            if label != "": return label
608    
609            return _("DEFAULT")
610    
611        def __eq__(self, other):
612            return ClassGroup.__eq__(self, other) \
613                and isinstance(other, ClassGroupDefault) \
614                and self.GetProperties() == other.GetProperties()
615    
616        def __repr__(self):
617            return "(" + ClassGroup.__repr__(self) + ")"
618    
619    class ClassGroupRange(ClassGroup):
620        """A Group that represents a range of values that map to the same
621           set of properties."""
622    
623        def __init__(self, _range = (0,1), props = None, label = "", group=None):
624            """Constructor.
625    
626            The minumum value must be strictly less than the maximum.
627    
628            _range -- either a tuple (min, max) where min < max or
629                      a Range object
630    
631            prop -- a ClassGroupProperites object. If prop is None a default
632                     set of properties is created.
633    
634            label -- a label for this group.
635            """
636    
637            ClassGroup.__init__(self, label, props, group)
638            self.SetRange(_range)
639    
640        def __copy__(self):
641            return ClassGroupRange(self.__range,
642                                   props = self.GetProperties(),
643                                   label = self.GetLabel())
644    
645        def __deepcopy__(self, memo):
646            return ClassGroupRange(copy.copy(self.__range),
647                                   group = self)
648    
649        def GetMin(self):
650            """Return the range's minimum value."""
651            return self.__range.GetRange()[1]
652    
653        def SetMin(self, min):
654            """Set the range's minimum value.
655        
656            min -- the new minimum. Note that this must be less than the current
657                   maximum value. Use SetRange() to change both min and max values.
658            """
659        
660            self.SetRange((min, self.__range.GetRange()[2]))
661    
662        def GetMax(self):
663            """Return the range's maximum value."""
664            return self.__range.GetRange()[2]
665    
666        def SetMax(self, max):
667            """Set the range's maximum value.
668        
669            max -- the new maximum. Note that this must be greater than the current
670                   minimum value. Use SetRange() to change both min and max values.
671            """
672            self.SetRange((self.__range.GetRange()[1], max))
673    
674        def SetRange(self, _range):
675            """Set a new range.
676    
677            _range -- Either a tuple (min, max) where min < max or
678                      a Range object.
679    
680            Raises ValueError on error.
681            """
682    
683            if isinstance(_range, Range):
684                self.__range = _range
685            elif isinstance(_range, types.TupleType) and len(_range) == 2:
686                self.__range = Range(("[", _range[0], _range[1], "["))
687            else:
688                raise ValueError()
689    
690        def GetRange(self):
691            """Return the range as a string"""
692            return self.__range.string(self.__range.GetRange())
693    
694        def GetRangeTuple(self):
695            return self.__range.GetRange()
696    
697        def Matches(self, value):
698            """Determine if the given value lies with the current range.
699    
700            The following check is used: min <= value < max.
701            """
702    
703            return operator.contains(self.__range, value)
704    
705        def GetDisplayText(self):
706            label = self.GetLabel()
707    
708            if label != "": return label
709    
710            return self.__range.string(self.__range.GetRange())
711    
712        def __eq__(self, other):
713            return ClassGroup.__eq__(self, other) \
714                and isinstance(other, ClassGroupRange) \
715                and self.__range == other.__range
716    
717        def __repr__(self):
718            return "(" + str(self.__range) + ClassGroup.__repr__(self) + ")"
719    
720    class ClassGroupMap(ClassGroup):
721        """Currently, this class is not used."""
722    
723        FUNC_ID = "id"
724    
725        def __init__(self, map_type = FUNC_ID, func = None, prop = None, label=""):
726            ClassGroup.__init__(self, label)
727    
728            self.map_type = map_type
729            self.func = func
730    
731            if self.func is None:
732                self.func = func_id
733    
734        def Map(self, value):
735            return self.func(value)
736    
737        def GetProperties(self):
738            return None
739    
740        def GetPropertiesFromValue(self, value):
741            pass
742    
743        def GetDisplayText(self):
744            return "Map: " + self.map_type
745    
746        #
747        # built-in mappings
748        #
749        def func_id(value):
750            return value
751    
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