├── .gitignore ├── LICENSE ├── README.md ├── pom.xml └── src └── main └── java └── typeahead ├── Completions.kt └── UIMain.kt /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by .ignore support plugin (hsz.mobi) 2 | ### JetBrains template 3 | # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio 4 | 5 | *.iml 6 | 7 | ## Directory-based project format: 8 | .idea/ 9 | # if you remove the above rule, at least ignore the following: 10 | 11 | # User-specific stuff: 12 | # .idea/workspace.xml 13 | # .idea/tasks.xml 14 | # .idea/dictionaries 15 | 16 | # Sensitive or high-churn files: 17 | # .idea/dataSources.ids 18 | # .idea/dataSources.xml 19 | # .idea/sqlDataSources.xml 20 | # .idea/dynamic.xml 21 | # .idea/uiDesigner.xml 22 | 23 | # Gradle: 24 | # .idea/gradle.xml 25 | # .idea/libraries 26 | 27 | # Mongo Explorer plugin: 28 | # .idea/mongoSettings.xml 29 | 30 | ## File-based project format: 31 | *.ipr 32 | *.iws 33 | 34 | ## Plugin-specific files: 35 | 36 | # IntelliJ 37 | /out/ 38 | 39 | # mpeltonen/sbt-idea plugin 40 | .idea_modules/ 41 | 42 | # JIRA plugin 43 | atlassian-ide-plugin.xml 44 | 45 | # Crashlytics plugin (for Android Studio and IntelliJ) 46 | com_crashlytics_export_strings.xml 47 | crashlytics.properties 48 | crashlytics-build.properties 49 | ### Maven template 50 | target/ 51 | pom.xml.tag 52 | pom.xml.releaseBackup 53 | pom.xml.versionsBackup 54 | pom.xml.next 55 | release.properties 56 | dependency-reduced-pom.xml 57 | buildNumber.properties 58 | .mvn/timing.properties 59 | ### Java template 60 | *.class 61 | 62 | # Mobile Tools for Java (J2ME) 63 | .mtj.tmp/ 64 | 65 | # Package Files # 66 | *.jar 67 | *.war 68 | *.ear 69 | 70 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 71 | hs_err_pid* 72 | 73 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | This is the code written as part of the Kotlin functional programming webinar done on October 22nd 2015. 2 | 3 | Please note that this program is NOT COMPLETE. It requires an n-gram list in the form of a tab separated 4 | file, with the first column being a frequency and the rest being the words. You can get such files from 5 | 6 | http://www.ngrams.info 7 | 8 | but the redistribution requirements mean I cannot bundle them here. -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 4.0.0 6 | 7 | com.vinumeris 8 | kotlin-webinar 9 | 1.0-SNAPSHOT 10 | 11 | 12 | 13 | bintray 14 | bintray 15 | http://jcenter.bintray.com 16 | 17 | 18 | 19 | 20 | 21 | 22 | org.apache.maven.plugins 23 | maven-shade-plugin 24 | 2.3 25 | 26 | 27 | 28 | typeahead.UIMainKt 29 | 30 | 31 | 32 | 33 | 34 | 35 | org.jetbrains.kotlin 36 | kotlin-maven-plugin 37 | ${kotlin.version} 38 | 39 | 40 | compile 41 | compile 42 | 43 | compile 44 | 45 | 46 | 47 | src/main/java 48 | 49 | 50 | 51 | 52 | test-compile 53 | test-compile 54 | 55 | test-compile 56 | 57 | 58 | 59 | src/test/java 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | org.jetbrains.kotlin 70 | kotlin-stdlib 71 | ${kotlin.version} 72 | 73 | 74 | junit 75 | junit 76 | 4.12 77 | 78 | 79 | org.funktionale 80 | funktionale 81 | 0.6_M14 82 | 83 | 84 | org.reactfx 85 | reactfx 86 | 2.0-M4 87 | 88 | 89 | nl.komponents.kovenant 90 | kovenant-jfx 91 | [2.8.0,2.9.0) 92 | 93 | 94 | 95 | 0.14.451 96 | 97 | -------------------------------------------------------------------------------- /src/main/java/typeahead/Completions.kt: -------------------------------------------------------------------------------- 1 | package typeahead 2 | 3 | import org.junit.Test 4 | import java.util.* 5 | import kotlin.test.assertEquals 6 | 7 | data class NGram(val words: String, val freq: Int = -1) : Comparable { 8 | override fun compareTo(other: NGram): Int { 9 | val x = words.compareTo(other.words) 10 | if (x != 0 || freq == -1) 11 | return x 12 | else 13 | return freq.compareTo(other.freq) 14 | } 15 | } 16 | 17 | fun String.pairwise() = mapIndexed { index, char -> if (index + 1 <= lastIndex) "$char${this[index + 1]}" else "" }.dropLast(1) 18 | 19 | fun NavigableSet.complete(input: String): List { 20 | // Convert input into a sequence of pairs of all possible prefixes and suffixes 21 | // 22 | // "a vect" -> [ 23 | // a vect : 24 | // a vec : t 25 | // a ve : ct 26 | // ] 27 | 28 | val canonicalisedInput = input.toLowerCase() 29 | val seq = sequenceOf(canonicalisedInput.lastIndex + 1 downTo 0).map { 30 | canonicalisedInput.substring(0, it) to canonicalisedInput.substring(it) 31 | } 32 | fun NavigableSet.query(s: String) = tailSet(NGram(s)).headSet(NGram(s + Char.MAX_SURROGATE)) 33 | val queried = seq.map { query(it.first) to it.second } 34 | 35 | // [ 36 | // [] -> '' 37 | // [] -> 't' 38 | // [ "a very common thing", .... ] -> 'ct' 39 | // ... 40 | // [.....] -> 'a vect' 41 | // ] 42 | 43 | val matches = queried.dropWhile { it.first.isEmpty() } 44 | val (candidates, remaining) = matches.first() 45 | 46 | val charPairs = if (remaining.length() == 1) listOf(remaining) else remaining.pairwise() 47 | val prefix = input.substring(0, input.length() - remaining.length()) 48 | 49 | return candidates.filter { c -> 50 | val postfix = c.words.substring(prefix.length()) 51 | charPairs.map { pair -> 52 | when { 53 | pair.length() == 1 -> postfix.contains(pair) 54 | else -> postfix.indexOf(pair[0]).let { it > 0 && it < postfix.lastIndexOf(pair[1]) } 55 | } 56 | }.all { it } 57 | }.sortedByDescending { it.freq }.map { it.words } 58 | } 59 | 60 | class Test { 61 | val ngrams = TreeSet(setOf( 62 | NGram("whatever"), 63 | NGram("a very common thing", 3), 64 | NGram("a very common phrase", 2), 65 | NGram("a very good call", 1), 66 | NGram("welcome to the", 0), 67 | NGram("welcome to my", 0) 68 | )) 69 | 70 | @Test 71 | fun pairs() { 72 | assertEquals(listOf("he", "el", "ll", "lo"), "hello".pairwise()) 73 | } 74 | 75 | @Test 76 | fun basics() { 77 | assertEquals(listOf("welcome to my"), ngrams.complete("weltm")) 78 | assertEquals(listOf("a very common thing", "a very common phrase", "a very good call"), ngrams.complete("a ver")) 79 | assertEquals(listOf("a very common thing"), ngrams.complete("a vect")) 80 | } 81 | } 82 | -------------------------------------------------------------------------------- /src/main/java/typeahead/UIMain.kt: -------------------------------------------------------------------------------- 1 | package typeahead 2 | 3 | import javafx.application.Application 4 | import javafx.collections.FXCollections 5 | import javafx.geometry.Insets 6 | import javafx.scene.Scene 7 | import javafx.scene.control.ListView 8 | import javafx.scene.control.TextField 9 | import javafx.scene.layout.VBox 10 | import javafx.stage.Stage 11 | import nl.komponents.kovenant.async 12 | import nl.komponents.kovenant.jfx.configureKovenant 13 | import nl.komponents.kovenant.ui.successUi 14 | import org.reactfx.EventStreams 15 | import java.nio.file.Files 16 | import java.nio.file.Paths 17 | import java.time.Duration 18 | import java.util.concurrent.ConcurrentSkipListSet 19 | import java.util.concurrent.Executors 20 | import kotlin.concurrent.currentThread 21 | import kotlin.util.measureTimeMillis 22 | 23 | val thread = Executors.newSingleThreadExecutor() 24 | 25 | class App : Application() { 26 | val ngrams = ConcurrentSkipListSet() 27 | 28 | override fun start(stage: Stage) { 29 | configureKovenant() 30 | 31 | val edit = TextField() 32 | val completionsList = ListView() 33 | 34 | val vbox = VBox(edit, completionsList).apply { 35 | spacing = 15.0 36 | padding = Insets(15.0) 37 | } 38 | 39 | val edits = EventStreams.valuesOf(edit.textProperty()).forgetful() 40 | val fewerEdits = edits.successionEnds(Duration.ofMillis(100)).filter { it.isNotBlank() } 41 | 42 | val inBackground = fewerEdits.threadBridgeFromFx(thread) 43 | val completions = inBackground.map { ngrams.complete(it) } 44 | val inForeground = completions.threadBridgeToFx(thread) 45 | 46 | val lastResult = inForeground.map { FXCollections.observableList(it) }.toBinding(FXCollections.emptyObservableList()) 47 | completionsList.itemsProperty().bind(lastResult) 48 | 49 | val guard = edits.suspend() 50 | async { 51 | load() 52 | } successUi { 53 | guard.close() 54 | } fail { 55 | throw RuntimeException(it) 56 | } 57 | 58 | stage.scene = Scene(vbox) 59 | stage.show() 60 | } 61 | 62 | private fun load() { 63 | val path = Paths.get("words.txt") 64 | val t = measureTimeMillis { 65 | Files.lines(path).parallel().forEach { line -> 66 | val words = line.substringAfter('\t').replace('\t', ' ').toLowerCase() 67 | val freq = line.substringBefore('\t').toInt() 68 | ngrams.add(NGram(words, freq)) 69 | } 70 | } 71 | println("$currentThread: Loaded file in $t msec") 72 | } 73 | } 74 | 75 | fun main(args: Array) { 76 | Application.launch(App::class.java, *args) 77 | System.exit(0) 78 | } --------------------------------------------------------------------------------