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annif.backend.mixins.ChunkingBackend._suggest()   A

↳ Parent: annif.backend.mixins

Complexity

Conditions 3

Size

Total Lines 15
Code Lines 15

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
eloc 15
dl 0
loc 15
rs 9.65
c 0
b 0
f 0
cc 3
nop 4
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"""Annif backend mixins that can be used to implement features"""
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import abc

            


            
                                                                                                            
                            
            
                                    
            
            

                
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from annif.suggestion import ListSuggestionResult

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class ChunkingBackend(metaclass=abc.ABCMeta):

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    """Annif backend mixin that implements chunking of input"""

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    @abc.abstractmethod

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    def _suggest_chunks(self, chunktexts, project):

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        """Suggest subjects for the chunked text; should be implemented by

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        the subclass inheriting this mixin"""

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        pass  # pragma: no cover

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    def _suggest(self, text, project, params):

            


            
                                                        
            
                                    
            
            

                
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        self.initialize()

            


            
                                                        
            
                                    
            
            

                
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        self.debug('Suggesting subjects for text "{}..." (len={})'.format(

            


            
                                                        
            
                                    
            
            

                
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            text[:20], len(text)))

            


            
                                                        
            
                                    
            
            

                
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        sentences = project.analyzer.tokenize_sentences(text)

            


            
                                                        
            
                                    
            
            

                
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        self.debug('Found {} sentences'.format(len(sentences)))

            


            
                                                        
            
                                    
            
            

                
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        chunksize = int(params['chunksize'])

            


            
                                                        
            
                                    
            
            

                
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        chunktexts = []

            


            
                                                        
            
                                    
            
            

                
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        for i in range(0, len(sentences), chunksize):

            


            
                                                        
            
                                    
            
            

                
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            chunktexts.append(' '.join(sentences[i:i + chunksize]))

            


            
                                                        
            
                                    
            
            

                
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        self.debug('Split sentences into {} chunks'.format(len(chunktexts)))

            


            
                                                        
            
                                    
            
            

                
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        if len(chunktexts) == 0:  # no input, empty result

            


            
                                                        
            
                                    
            
            

                
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            return ListSuggestionResult(

            


            
                                                        
            
                                    
            
            

                
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                hits=[], subject_index=project.subjects)

            


            
                                                        
            
                                    
            
            

                
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        return self._suggest_chunks(chunktexts, project)

            


            
                                                        
            
                                    
            
            

                
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