Member predicate StringOps :: ConcatenationNode :: getPreviousLeaf

Gets the leaf that is occurs immediately before this leaf in the concatenation tree, if any.

For example, y is the previous leaf from z in x + y + z.


                            
                                
                                    ConcatenationLeaf
                                
                                 
                            
                            
                                getPreviousLeaf
                            
                            
                                (
                                )