bleve/analysis/language/fr/analyzer_fr_test.go

//  Copyright (c) 2014 Couchbase, Inc.
//  Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
//  except in compliance with the License. You may obtain a copy of the License at
//    http://www.apache.org/licenses/LICENSE-2.0
//  Unless required by applicable law or agreed to in writing, software distributed under the
//  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
//  either express or implied. See the License for the specific language governing permissions
//  and limitations under the License.

// +build libstemmer full
// +build icu full

package fr

import (
	"reflect"
	"testing"

	"github.com/blevesearch/bleve/analysis"
	"github.com/blevesearch/bleve/registry"
)

func TestFrenchAnalyzer(t *testing.T) {
	tests := []struct {
		input  []byte
		output analysis.TokenStream
	}{
		{
			input:  []byte(""),
			output: analysis.TokenStream{},
		},
		{
			input: []byte("chien chat cheval"),
			output: analysis.TokenStream{
				&analysis.Token{
					Term: []byte("chien"),
				},
				&analysis.Token{
					Term: []byte("chat"),
				},
				&analysis.Token{
					Term: []byte("cheval"),
				},
			},
		},
		{
			input: []byte("chien CHAT CHEVAL"),
			output: analysis.TokenStream{
				&analysis.Token{
					Term: []byte("chien"),
				},
				&analysis.Token{
					Term: []byte("chat"),
				},
				&analysis.Token{
					Term: []byte("cheval"),
				},
			},
		},
		{
			input: []byte("  chien  ,? + = -  CHAT /: > CHEVAL"),
			output: analysis.TokenStream{
				&analysis.Token{
					Term: []byte("chien"),
				},
				&analysis.Token{
					Term: []byte("chat"),
				},
				&analysis.Token{
					Term: []byte("cheval"),
				},
			},
		},
		{
			input: []byte("chien++"),
			output: analysis.TokenStream{
				&analysis.Token{
					Term: []byte("chien"),
				},
			},
		},
		// fails
		// {
		// 	input: []byte("mot \"entreguillemet\""),
		// 	output: analysis.TokenStream{
		// 		&analysis.Token{
		// 			Term: []byte("mot"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("entreguilemet"),
		// 		},
		// 	},
		// },
		// fails, lucene light stemmer normalizes ç to c
		// need to invsetigate french stemmer
		// {
		// 	input: []byte("Jean-François"),
		// 	output: analysis.TokenStream{
		// 		&analysis.Token{
		// 			Term: []byte("jean"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("francoi"),
		// 		},
		// 	},
		// },
		// stop words
		{
			input: []byte("le la chien les aux chat du des à cheval"),
			output: analysis.TokenStream{
				&analysis.Token{
					Term: []byte("chien"),
				},
				&analysis.Token{
					Term: []byte("chat"),
				},
				&analysis.Token{
					Term: []byte("cheval"),
				},
			},
		},
		// nouns and adjectives
		// fails, stemming difference on habitabl/habit and é to e normalization
		// {
		// 	input: []byte("lances chismes habitable chiste éléments captifs"),
		// 	output: analysis.TokenStream{
		// 		&analysis.Token{
		// 			Term: []byte("lanc"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("chism"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("habitabl"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("chist"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("element"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("captif"),
		// 		},
		// 	},
		// },
		// verbs
		// fails very different stemming results
		// {
		// 	input: []byte("finissions souffrirent rugissante"),
		// 	output: analysis.TokenStream{
		// 		&analysis.Token{
		// 			Term: []byte("finision"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("soufrirent"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("rugisant"),
		// 		},
		// 	},
		// },
		// also fails, very different stemming results
		// {
		// 	input: []byte("C3PO aujourd'hui oeuf ïâöûàä anticonstitutionnellement Java++ "),
		// 	output: analysis.TokenStream{
		// 		&analysis.Token{
		// 			Term: []byte("c3po"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("aujourd'hui"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("oeuf"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("ïaöuaä"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("anticonstitutionel'hui"),
		// 		},
		// 		&analysis.Token{
		// 			Term: []byte("java"),
		// 		},
		// 	},
		// },
	}

	cache := registry.NewCache()
	analyzer, err := cache.AnalyzerNamed(AnalyzerName)
	if err != nil {
		t.Fatal(err)
	}
	for _, test := range tests {
		actual := analyzer.Analyze(test.input)
		if len(actual) != len(test.output) {
			t.Fatalf("expected length: %d, got %d", len(test.output), len(actual))
		}
		for i, tok := range actual {
			if !reflect.DeepEqual(tok.Term, test.output[i].Term) {
				t.Errorf("expected term %s (% x) got %s (% x)", test.output[i].Term, test.output[i].Term, tok.Term, tok.Term)
			}
		}
	}
}