1/* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package jdk.internal.jshell.tool; 27 28import java.util.List; 29import static java.util.Comparator.comparing; 30import java.util.Map; 31import java.util.function.BiPredicate; 32import java.util.function.Supplier; 33import static java.util.stream.Collectors.toList; 34import java.util.stream.Stream; 35import jdk.internal.jshell.tool.JShellTool.CompletionProvider; 36import jdk.jshell.SourceCodeAnalysis; 37import jdk.jshell.SourceCodeAnalysis.Suggestion; 38 39class ContinuousCompletionProvider implements CompletionProvider { 40 41 static final BiPredicate<String, String> STARTSWITH_MATCHER = String::startsWith; 42 static final BiPredicate<String, String> PERFECT_MATCHER = String::equals; 43 44 private final Supplier<Map<String, CompletionProvider>> wordCompletionProviderSupplier; 45 private final BiPredicate<String, String> matcher; 46 47 ContinuousCompletionProvider( 48 Map<String, CompletionProvider> wordCompletionProvider, 49 BiPredicate<String, String> matcher) { 50 this(() -> wordCompletionProvider, matcher); 51 } 52 53 ContinuousCompletionProvider( 54 Supplier<Map<String, CompletionProvider>> wordCompletionProviderSupplier, 55 BiPredicate<String, String> matcher) { 56 this.wordCompletionProviderSupplier = wordCompletionProviderSupplier; 57 this.matcher = matcher; 58 } 59 60 @Override 61 public List<Suggestion> completionSuggestions(String input, int cursor, int[] anchor) { 62 String prefix = input.substring(0, cursor); 63 int space = prefix.indexOf(' '); 64 65 Stream<SourceCodeAnalysis.Suggestion> result; 66 67 Map<String, CompletionProvider> wordCompletionProvider = wordCompletionProviderSupplier.get(); 68 69 if (space == (-1)) { 70 result = wordCompletionProvider.keySet().stream() 71 .distinct() 72 .filter(key -> key.startsWith(prefix)) 73 .map(key -> new JShellTool.ArgSuggestion(key + " ")); 74 anchor[0] = 0; 75 } else { 76 String rest = prefix.substring(space + 1); 77 String word = prefix.substring(0, space); 78 79 List<CompletionProvider> candidates = wordCompletionProvider.entrySet().stream() 80 .filter(e -> matcher.test(e.getKey(), word)) 81 .map(Map.Entry::getValue) 82 .collect(toList()); 83 if (candidates.size() == 1) { 84 result = candidates.get(0).completionSuggestions(rest, cursor - space - 1, anchor).stream(); 85 } else { 86 result = Stream.empty(); 87 } 88 anchor[0] += space + 1; 89 } 90 91 return result.sorted(comparing(Suggestion::continuation)) 92 .collect(toList()); 93 } 94 95} 96