Class MapRule

source code

                   object --+                
                            |                
 base.structure.StructureBase --+            
                                |            
                   object --+   |            
                            |   |            
           base.common.Parser --+            
                                |            
base.structure.ParseableStructure --+        
                                    |        
             base.structure.Structure --+    
                                        |    
                         MappedExpression --+
                                            |
                                           MapRule

A mapping rule.

To specify the source of a mapping, you can either

• grab a value from what's emitted by the grammar or defined using var via

  the source attribute. The value given for source is converted to a python value and stored.

• or give a python expression in the body. In that case, no further type conversion will be attempted.

If neither source or a body is given, map uses the key attribute as its source attribute.

The map rule generates a key/value pair in the result record.