Fuzzier search matching

-[] Backend
  -[] indexes e5.25
    -[x] wire up results: Contacts / Conversations / Messages actual: 3hr
    -[ ] group thread est: actual:
      -[x] group name actual: e.25
      -[ ] group member name: e.25
      -[ ] group member number: e.25
    -[ ] contact thread e.5
      -[ ] name
      -[ ] number
    -[ ] messages e1
      -[ ] content
-[] Frontend e10.75
  -[x] wire up VC's a.5
  -[x] show search results only when search box has content a.25
  -[] show search results: Contact / Conversation / Messages e2
   -[x] wire up matchs
   -[] style contact cell
   -[] style conversation cell
   -[] style messages cell
  -[] tapping thread search result takes you to conversation e1
  -[] tapping message search result takes you to message e1
  -[] show snippet text for matched message e1
  -[] highlight matched text in thread e3
  -[] go to next search result in thread e2
  -[] No Results page
  -[] Hide search unless pulled down

Signal/src/ViewControllers/HomeView/HomeViewController.m

@@ -311,7 +311,7 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
     searchController.view.frame = self.view.frame;
     [self.view addSubview:searchController.view];
     // TODO - better/more flexible way to pin below search bar?
-    [searchController.view autoPinEdgesToSuperviewEdgesWithInsets:UIEdgeInsetsMake(58, 0, 0, 0)];
+    [searchController.view autoPinEdgesToSuperviewEdgesWithInsets:UIEdgeInsetsMake(60, 0, 0, 0)];
     searchBar.delegate = searchController;
     
     OWSAssert(self.tableView.tableHeaderView == nil);

Signal/test/util/SearcherTest.swift

@@ -8,7 +8,7 @@ import XCTest
 
 class ConversationSearcherTest: XCTestCase {
 
-    // Mark: Dependencies
+    // MARK: - Dependencies
     var searcher: ConversationSearcher {
         return ConversationSearcher.shared
     }
@@ -17,68 +17,152 @@ class ConversationSearcherTest: XCTestCase {
         return OWSPrimaryStorage.shared().dbReadWriteConnection
     }
 
-    // Mark: Test Life Cycle
+    // MARK: - Test Life Cycle
 
     override func setUp() {
         super.setUp()
 
         FullTextSearchFinder.syncRegisterDatabaseExtension(storage: OWSPrimaryStorage.shared())
-    }
-
-    // Mark: Tests
-
-    func testSearchByGroupName() {
 
+        TSContactThread.removeAllObjectsInCollection()
         TSGroupThread.removeAllObjectsInCollection()
 
-        var bookClubThread: ThreadViewModel!
-        var snackClubThread: ThreadViewModel!
         self.dbConnection.readWrite { transaction in
             let bookModel = TSGroupModel(title: "Book Club", memberIds: [], image: nil, groupId: Randomness.generateRandomBytes(16))
             let bookClubGroupThread = TSGroupThread.getOrCreateThread(with: bookModel, transaction: transaction)
-            bookClubThread = ThreadViewModel(thread: bookClubGroupThread, transaction: transaction)
+            self.bookClubThread = ThreadViewModel(thread: bookClubGroupThread, transaction: transaction)
 
             let snackModel = TSGroupModel(title: "Snack Club", memberIds: [], image: nil, groupId: Randomness.generateRandomBytes(16))
             let snackClubGroupThread = TSGroupThread.getOrCreateThread(with: snackModel, transaction: transaction)
-            snackClubThread = ThreadViewModel(thread: snackClubGroupThread, transaction: transaction)
+            self.snackClubThread = ThreadViewModel(thread: snackClubGroupThread, transaction: transaction)
+
+            let aliceContactThread = TSContactThread.getOrCreateThread(withContactId: "+12345678900", transaction: transaction)
+            self.aliceThread = ThreadViewModel(thread: aliceContactThread, transaction: transaction)
+
+            let bobContactThread = TSContactThread.getOrCreateThread(withContactId: "+49030183000", transaction: transaction)
+            self.bobThread = ThreadViewModel(thread: bobContactThread, transaction: transaction)
         }
+    }
+
+    // MARK: - Fixtures
+
+    var bookClubThread: ThreadViewModel!
+    var snackClubThread: ThreadViewModel!
+
+    var aliceThread: ThreadViewModel!
+    var bobThread: ThreadViewModel!
+
+    // MARK: Tests
+
+    func testSearchByGroupName() {
+
+        var resultSet: SearchResultSet = .empty
 
         // No Match
-        let noMatch = resultSet(searchText: "asdasdasd")
-        XCTAssert(noMatch.conversations.isEmpty)
+        resultSet = getResultSet(searchText: "asdasdasd")
+        XCTAssert(resultSet.conversations.isEmpty)
 
         // Partial Match
-        let bookMatch = resultSet(searchText: "Book")
-        XCTAssert(bookMatch.conversations.count == 1)
-        if let foundThread: ThreadViewModel = bookMatch.conversations.first?.thread {
+        resultSet = getResultSet(searchText: "Book")
+        XCTAssert(resultSet.conversations.count == 1)
+        if let foundThread: ThreadViewModel = resultSet.conversations.first?.thread {
             XCTAssertEqual(bookClubThread, foundThread)
         } else {
             XCTFail("no thread found")
         }
 
-        let snackMatch = resultSet(searchText: "Snack")
-        XCTAssert(snackMatch.conversations.count == 1)
-        if let foundThread: ThreadViewModel = snackMatch.conversations.first?.thread {
+        resultSet = getResultSet(searchText: "Snack")
+        XCTAssert(resultSet.conversations.count == 1)
+        if let foundThread: ThreadViewModel = resultSet.conversations.first?.thread {
             XCTAssertEqual(snackClubThread, foundThread)
         } else {
             XCTFail("no thread found")
         }
 
         // Multiple Partial Matches
-        let multipleMatch = resultSet(searchText: "Club")
-        XCTAssert(multipleMatch.conversations.count == 2)
-        XCTAssert(multipleMatch.conversations.map { $0.thread }.contains(bookClubThread))
-        XCTAssert(multipleMatch.conversations.map { $0.thread }.contains(snackClubThread))
+        resultSet = getResultSet(searchText: "Club")
+        XCTAssertEqual(2, resultSet.conversations.count)
+        XCTAssert(resultSet.conversations.map { $0.thread }.contains(bookClubThread))
+        XCTAssert(resultSet.conversations.map { $0.thread }.contains(snackClubThread))
 
         // Match Name Exactly
-        let exactMatch = resultSet(searchText: "Book Club")
-        XCTAssert(exactMatch.conversations.count == 1)
-        XCTAssertEqual(bookClubThread, exactMatch.conversations.first!.thread)
+        resultSet = getResultSet(searchText: "Book Club")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(bookClubThread, resultSet.conversations.first!.thread)
+    }
+
+    func testSearchContactByNumber() {
+        var resultSet: SearchResultSet = .empty
+
+        // No match
+        resultSet = getResultSet(searchText: "+5551239999")
+        XCTAssertEqual(0, resultSet.conversations.count)
+
+        // Exact match
+        resultSet = getResultSet(searchText: "+12345678900")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+
+        // Partial match
+        resultSet = getResultSet(searchText: "+123456")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+
+        // Prefixes
+        resultSet = getResultSet(searchText: "12345678900")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+
+        resultSet = getResultSet(searchText: "49")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(bobThread, resultSet.conversations.first?.thread)
+
+        resultSet = getResultSet(searchText: "1-234-56")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+
+        resultSet = getResultSet(searchText: "123456")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+
+        resultSet = getResultSet(searchText: "1.234.56")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+    }
+
+    // TODO
+    func pending_testSearchContactByNumber() {
+        var resultSet: SearchResultSet = .empty
+
+        // Phone Number formatting should be forgiving
+        resultSet = getResultSet(searchText: "234.56")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+
+        resultSet = getResultSet(searchText: "234 56")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+    }
+
+    func testSearchContactByName() {
+        var resultSet: SearchResultSet = .empty
+
+        resultSet = getResultSet(searchText: "Alice")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(aliceThread, resultSet.conversations.first?.thread)
+
+        resultSet = getResultSet(searchText: "Bob")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(bobThread, resultSet.conversations.first?.thread)
+
+        resultSet = getResultSet(searchText: "Barker")
+        XCTAssertEqual(1, resultSet.conversations.count)
+        XCTAssertEqual(bobThread, resultSet.conversations.first?.thread)
     }
 
     // Mark: Helpers
 
-    private func resultSet(searchText: String) -> SearchResultSet {
+    private func getResultSet(searchText: String) -> SearchResultSet {
         var results: SearchResultSet!
         self.dbConnection.read { transaction in
             results = self.searcher.results(searchText: searchText, transaction: transaction)

SignalServiceKit/src/Storage/FullTextSearchFinder.swift

@@ -4,6 +4,20 @@
 
 import Foundation
 
+// Create a searchable index for objects of type T
+public class SearchIndexer<T> {
+
+    private let indexBlock: (T) -> String
+
+    public init(indexBlock: @escaping (T) -> String) {
+        self.indexBlock = indexBlock
+    }
+
+    public func index(_ item: T) -> String {
+        return indexBlock(item)
+    }
+}
+
 @objc
 public class FullTextSearchFinder: NSObject {
 
@@ -13,7 +27,13 @@ public class FullTextSearchFinder: NSObject {
             return
         }
 
-        ext.enumerateKeysAndObjects(matching: searchText) { (_, _, object, _) in
+        let normalized = FullTextSearchFinder.normalize(text: searchText)
+
+        // We want a forgiving query for phone numbers
+        // TODO a stricter "whole word" query for body text?
+        let prefixQuery = "*\(normalized)*"
+
+        ext.enumerateKeysAndObjects(matching: prefixQuery) { (_, _, object, _) in
             block(object)
         }
     }
@@ -22,9 +42,60 @@ public class FullTextSearchFinder: NSObject {
         return transaction.ext(FullTextSearchFinder.dbExtensionName) as? YapDatabaseFullTextSearchTransaction
     }
 
+    // Mark: Index Building
+
+    private class func normalize(text: String) -> String {
+        var normalized: String = text.trimmingCharacters(in: .whitespacesAndNewlines)
+
+        // Remove any phone number formatting from the search terms
+        let nonformattingScalars = normalized.unicodeScalars.lazy.filter {
+            !CharacterSet.punctuationCharacters.contains($0)
+        }
+
+        normalized = String(String.UnicodeScalarView(nonformattingScalars))
+
+        return normalized
+    }
+
+    private static let groupThreadIndexer: SearchIndexer<TSGroupThread> = SearchIndexer { (groupThread: TSGroupThread) in
+        let searchableContent = groupThread.groupModel.groupName ?? ""
+
+        // TODO member names, member numbers
+
+        return normalize(text: searchableContent)
+    }
+
+    private static let contactThreadIndexer: SearchIndexer<TSContactThread> = SearchIndexer { (contactThread: TSContactThread) in
+        let searchableContent =  contactThread.contactIdentifier()
+
+        // TODO contact name
+
+        return normalize(text: searchableContent)
+    }
+
+    private static let contactIndexer: SearchIndexer<String> = SearchIndexer { (recipientId: String) in
+
+        let searchableContent =  "\(recipientId)"
+
+        // TODO contact name
+
+        return normalize(text: searchableContent)
+    }
+
+    private class func indexContent(object: Any) -> String? {
+        if let groupThread = object as? TSGroupThread {
+            return self.groupThreadIndexer.index(groupThread)
+        } else if let contactThread = object as? TSContactThread {
+            return self.contactThreadIndexer.index(contactThread)
+        } else {
+            return nil
+        }
+    }
+
     // MARK: - Extension Registration
 
-    private static let dbExtensionName: String = "FullTextSearchFinderExtension"
+    // MJK - FIXME, remove dynamic name when done developing.
+    private static let dbExtensionName: String = "FullTextSearchFinderExtension\(Date())"
 
     @objc
     public class func asyncRegisterDatabaseExtension(storage: OWSStorage) {
@@ -37,18 +108,20 @@ public class FullTextSearchFinder: NSObject {
     }
 
     private class var dbExtensionConfig: YapDatabaseFullTextSearch {
+        // TODO is it worth doing faceted search, i.e. Author / Name / Content?
+        // seems unlikely that mobile users would use the "author: Alice" search syntax.
+        // so for now, everything searchable is jammed into a single column
         let contentColumnName = "content"
+
         let handler = YapDatabaseFullTextSearchHandler.withObjectBlock { (dict: NSMutableDictionary, _: String, _: String, object: Any) in
-            if let groupThread = object as? TSGroupThread {
-                dict[contentColumnName] = groupThread.groupModel.groupName
+            if let content: String = indexContent(object: object) {
+                dict[contentColumnName] = content
             }
         }
 
         // update search index on contact name changes?
         // update search index on message insertion?
 
-        // TODO is it worth doing faceted search, i.e. Author / Name / Content?
-        // seems unlikely that mobile users would use the "author: Alice" search syntax.
         return YapDatabaseFullTextSearch(columnNames: ["content"], handler: handler)
     }
 }