Bug 1449038 - Add a simple weighted search to KeywordService

https://trello.com/c/2fFSJMX1
https://bugzilla.redhat.com/show_bug.cgi?id=1449038

dist/origin-web-common-services.js

@@ -2932,7 +2932,9 @@ angular.module('openshiftCommonServices')
 ;'use strict';
 
 angular.module("openshiftCommonServices")
-  .service("KeywordService", function(){
+  .service("KeywordService", function($filter) {
+
+    var displayName = $filter('displayName');
 
     var generateKeywords = function(filterText) {
       if (!filterText) {
@@ -2977,8 +2979,57 @@ angular.module("openshiftCommonServices")
       return filteredObjects;
     };
 
+    // Perform a simple weighted search.
+    // weightedSearch is like filterForKeywords, except each field has a weight
+    // and the result is a sorted array of matches. filterFields is an array of
+    // objects with keys `path` and `weight`.
+    var weightedSearch = function(objects, filterFields, keywords) {
+      if (_.isEmpty(keywords)) {
+        return [];
+      }
+
+      var results = [];
+      _.each(objects, function(object) {
+        // Keep a score for matches, weighted by field.
+        var score = 0;
+        _.each(keywords, function(regex) {
+          var matchesKeyword = false;
+          _.each(filterFields, function(field) {
+            var value = _.get(object, field.path);
+            if (!value) {
+              return;
+            }
+
+            if (regex.test(value)) {
+              // For each matching keyword, add the field weight to the score.
+              score += field.weight;
+              matchesKeyword = true;
+            }
+          });
+
+          if (!matchesKeyword) {
+            // We've missed a keyword. Set score to 0 and short circuit the loop.
+            score = 0;
+            return false;
+          }
+        });
+
+        if (score > 0) {
+          results.push({
+            object: object,
+            score: score
+          });
+        }
+      });
+
+      // Sort first by score, then by display name for items that have the same score.
+      var orderedResult = _.orderBy(results, ['score', displayName], ['desc', 'asc']);
+      return _.map(orderedResult, 'object');
+    };
+
     return {
       filterForKeywords: filterForKeywords,
+      weightedSearch: weightedSearch,
       generateKeywords: generateKeywords
     };
   });

dist/origin-web-common.js

@@ -5000,7 +5000,9 @@ angular.module('openshiftCommonServices')
 ;'use strict';
 
 angular.module("openshiftCommonServices")
-  .service("KeywordService", function(){
+  .service("KeywordService", ["$filter", function($filter) {
+
+    var displayName = $filter('displayName');
 
     var generateKeywords = function(filterText) {
       if (!filterText) {
@@ -5045,11 +5047,60 @@ angular.module("openshiftCommonServices")
       return filteredObjects;
     };
 
+    // Perform a simple weighted search.
+    // weightedSearch is like filterForKeywords, except each field has a weight
+    // and the result is a sorted array of matches. filterFields is an array of
+    // objects with keys `path` and `weight`.
+    var weightedSearch = function(objects, filterFields, keywords) {
+      if (_.isEmpty(keywords)) {
+        return [];
+      }
+
+      var results = [];
+      _.each(objects, function(object) {
+        // Keep a score for matches, weighted by field.
+        var score = 0;
+        _.each(keywords, function(regex) {
+          var matchesKeyword = false;
+          _.each(filterFields, function(field) {
+            var value = _.get(object, field.path);
+            if (!value) {
+              return;
+            }
+
+            if (regex.test(value)) {
+              // For each matching keyword, add the field weight to the score.
+              score += field.weight;
+              matchesKeyword = true;
+            }
+          });
+
+          if (!matchesKeyword) {
+            // We've missed a keyword. Set score to 0 and short circuit the loop.
+            score = 0;
+            return false;
+          }
+        });
+
+        if (score > 0) {
+          results.push({
+            object: object,
+            score: score
+          });
+        }
+      });
+
+      // Sort first by score, then by display name for items that have the same score.
+      var orderedResult = _.orderBy(results, ['score', displayName], ['desc', 'asc']);
+      return _.map(orderedResult, 'object');
+    };
+
     return {
       filterForKeywords: filterForKeywords,
+      weightedSearch: weightedSearch,
       generateKeywords: generateKeywords
     };
-  });
+  }]);
 ;'use strict';
 
 angular.module('openshiftCommonServices')

src/services/keyword.js

 'use strict';
 
 angular.module("openshiftCommonServices")
-  .service("KeywordService", function(){
+  .service("KeywordService", function($filter) {
+
+    var displayName = $filter('displayName');
 
     var generateKeywords = function(filterText) {
       if (!filterText) {
@@ -46,8 +48,57 @@ angular.module("openshiftCommonServices")
       return filteredObjects;
     };
 
+    // Perform a simple weighted search.
+    // weightedSearch is like filterForKeywords, except each field has a weight
+    // and the result is a sorted array of matches. filterFields is an array of
+    // objects with keys `path` and `weight`.
+    var weightedSearch = function(objects, filterFields, keywords) {
+      if (_.isEmpty(keywords)) {
+        return [];
+      }
+
+      var results = [];
+      _.each(objects, function(object) {
+        // Keep a score for matches, weighted by field.
+        var score = 0;
+        _.each(keywords, function(regex) {
+          var matchesKeyword = false;
+          _.each(filterFields, function(field) {
+            var value = _.get(object, field.path);
+            if (!value) {
+              return;
+            }
+
+            if (regex.test(value)) {
+              // For each matching keyword, add the field weight to the score.
+              score += field.weight;
+              matchesKeyword = true;
+            }
+          });
+
+          if (!matchesKeyword) {
+            // We've missed a keyword. Set score to 0 and short circuit the loop.
+            score = 0;
+            return false;
+          }
+        });
+
+        if (score > 0) {
+          results.push({
+            object: object,
+            score: score
+          });
+        }
+      });
+
+      // Sort first by score, then by display name for items that have the same score.
+      var orderedResult = _.orderBy(results, ['score', displayName], ['desc', 'asc']);
+      return _.map(orderedResult, 'object');
+    };
+
     return {
       filterForKeywords: filterForKeywords,
+      weightedSearch: weightedSearch,
       generateKeywords: generateKeywords
     };
   });

test/spec/services/keywordServiceSpec.js

@@ -107,4 +107,94 @@ describe('KeywordService', function() {
       expect(result).toEqual(mockData);
     });
   });
+
+  describe('#weightedSearch', function() {
+    var mockData = {
+      'sample-app': {
+        metadata: {
+          name: 'sample-app',
+          annotations: {
+            'openshift.io/display-name': 'Sample App',
+            'openshift.io/description': 'Sample app that uses Maria'
+          }
+        }
+      },
+      'maria-db': {
+        metadata: {
+          name: 'maria-db',
+          annotations: {
+            'openshift.io/display-name': 'Maria DB'
+          }
+        }
+      },
+      'mongo-db': {
+        metadata: {
+          name: 'mongo-db',
+          annotations: {
+            'openshift.io/display-name': 'Mongo DB',
+            tags: 'db'
+          }
+        }
+      }
+    };
+
+    it('should honor field weights', function() {
+      var keywords = KeywordService.generateKeywords('maria');
+      var result = KeywordService.weightedSearch(mockData, [{
+        path: 'metadata.annotations["openshift.io/display-name"]',
+        weight: 10
+      }, {
+        path: 'metadata.annotations["openshift.io/description"]',
+        weight: 2
+      }], keywords);
+      expect(result).toEqual([ mockData['maria-db'], mockData['sample-app'] ]);
+    });
+
+    it('should weight multiple matches higher', function() {
+      var keywords = KeywordService.generateKeywords('db');
+      var result = KeywordService.weightedSearch(mockData, [{
+        path: 'metadata.annotations["openshift.io/display-name"]',
+        weight: 10
+      }, {
+        path: 'metadata.annotations.tags',
+        weight: 2
+      }], keywords);
+      expect(result).toEqual([ mockData['mongo-db'], mockData['maria-db'] ]);
+    });
+
+    it('should match all keywords', function() {
+      var keywords = KeywordService.generateKeywords('maria db');
+      var result = KeywordService.weightedSearch(mockData, [{
+        path: 'metadata.annotations["openshift.io/display-name"]',
+        weight: 10
+      }, {
+        path: 'metadata.annotations["openshift.io/description"]',
+        weight: 2
+      }], keywords);
+      expect(result).toEqual([ mockData['maria-db'] ]);
+    });
+
+    it('should return an empty array when no keywords', function() {
+      var result = KeywordService.weightedSearch(mockData, [{
+        path: 'metadata.annotations["openshift.io/display-name"]',
+        weight: 10
+      }, {
+        path: 'metadata.annotations["openshift.io/description"]',
+        weight: 2
+      }], []);
+      expect(result.length).toEqual(0);
+    });
+
+    it('should return an empty array when no matches', function() {
+      var keywords = KeywordService.generateKeywords('MISSING');
+      var result = KeywordService.weightedSearch(mockData, [{
+        path: 'metadata.annotations["openshift.io/display-name"]',
+        weight: 10
+      }, {
+        path: 'metadata.annotations["openshift.io/description"]',
+        weight: 2
+      }], keywords);
+      expect(result.length).toEqual(0);
+    });
+  });
 });