langtools/src/jdk.jshell/share/classes/jdk/internal/jshell/tool/EditingHistory.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package jdk.internal.jshell.tool;

 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.ListIterator;
 import java.util.Set;
 import java.util.prefs.BackingStoreException;
 import java.util.prefs.Preferences;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;

 import jdk.internal.jline.console.history.History;
 import jdk.internal.jline.console.history.History.Entry;
 import jdk.internal.jline.console.history.MemoryHistory;
 import jdk.jshell.SourceCodeAnalysis.CompletionInfo;

 /*Public for tests (HistoryTest).
  */
 public abstract class EditingHistory implements History {

     private final Preferences prefs;
     private final History fullHistory;
     private History currentDelegate;

     protected EditingHistory(Preferences prefs) {
         this.prefs = prefs;
         this.fullHistory = new MemoryHistory();
         this.currentDelegate = fullHistory;
         load();
     }

     @Override
     public int size() {
         return currentDelegate.size();
     }

     @Override
     public boolean isEmpty() {
         return currentDelegate.isEmpty();
     }

     @Override
     public int index() {
         return currentDelegate.index();
     }

     @Override
     public void clear() {
         if (currentDelegate != fullHistory)
             throw new IllegalStateException("narrowed");
         currentDelegate.clear();
     }

     @Override
     public CharSequence get(int index) {
         return currentDelegate.get(index);
     }

     @Override
     public void add(CharSequence line) {
         NarrowingHistoryLine currentLine = null;
         int origIndex = fullHistory.index();
         int fullSize;
         try {
             fullHistory.moveToEnd();
             fullSize = fullHistory.index();
             if (currentDelegate == fullHistory) {
                 if (origIndex < fullHistory.index()) {
                     for (Entry entry : fullHistory) {
                         if (!(entry.value() instanceof NarrowingHistoryLine))
                             continue;
                         int[] cluster = ((NarrowingHistoryLine) entry.value()).span;
                         if (cluster[0] == origIndex && cluster[1] > cluster[0]) {
                             currentDelegate = new MemoryHistory();
                             for (int i = cluster[0]; i <= cluster[1]; i++) {
                                 currentDelegate.add(fullHistory.get(i));
                             }
                         }
                     }
                 }
             }
             fullHistory.moveToEnd();
             while (fullHistory.previous()) {
                 CharSequence c = fullHistory.current();
                 if (c instanceof NarrowingHistoryLine) {
                     currentLine = (NarrowingHistoryLine) c;
                     break;
                 }
             }
         } finally {
             fullHistory.moveTo(origIndex);
         }
         if (currentLine == null || currentLine.span[1] != (-1)) {
             line = currentLine = new NarrowingHistoryLine(line, fullSize);
         }
         StringBuilder complete = new StringBuilder();
         for (int i = currentLine.span[0]; i < fullSize; i++) {
             complete.append(fullHistory.get(i));
         }
         complete.append(line);
         if (analyzeCompletion(complete.toString()).completeness.isComplete) {
             currentLine.span[1] = fullSize; //TODO: +1?
             currentDelegate = fullHistory;
         }
         fullHistory.add(line);
     }

     protected abstract CompletionInfo analyzeCompletion(String input);

     @Override
     public void set(int index, CharSequence item) {
         if (currentDelegate != fullHistory)
             throw new IllegalStateException("narrowed");
         currentDelegate.set(index, item);
     }

     @Override
     public CharSequence remove(int i) {
         if (currentDelegate != fullHistory)
             throw new IllegalStateException("narrowed");
         return currentDelegate.remove(i);
     }

     @Override
     public CharSequence removeFirst() {
         if (currentDelegate != fullHistory)
             throw new IllegalStateException("narrowed");
         return currentDelegate.removeFirst();
     }

     @Override
     public CharSequence removeLast() {
         if (currentDelegate != fullHistory)
             throw new IllegalStateException("narrowed");
         return currentDelegate.removeLast();
     }

     @Override
     public void replace(CharSequence item) {
         if (currentDelegate != fullHistory)
             throw new IllegalStateException("narrowed");
         currentDelegate.replace(item);
     }

     @Override
     public ListIterator<Entry> entries(int index) {
         return currentDelegate.entries(index);
     }

     @Override
     public ListIterator<Entry> entries() {
         return currentDelegate.entries();
     }

     @Override
     public Iterator<Entry> iterator() {
         return currentDelegate.iterator();
     }

     @Override
     public CharSequence current() {
         return currentDelegate.current();
     }

     @Override
     public boolean previous() {
         return currentDelegate.previous();
     }

     @Override
     public boolean next() {
         return currentDelegate.next();
     }

     @Override
     public boolean moveToFirst() {
         return currentDelegate.moveToFirst();
     }

     @Override
     public boolean moveToLast() {
         return currentDelegate.moveToLast();
     }

     @Override
     public boolean moveTo(int index) {
         return currentDelegate.moveTo(index);
     }

     @Override
     public void moveToEnd() {
         currentDelegate.moveToEnd();
     }

     public boolean previousSnippet() {
         for (int i = index() - 1; i >= 0; i--) {
             if (get(i) instanceof NarrowingHistoryLine) {
                 moveTo(i);
                 return true;
             }
         }

         return false;
     }

     public boolean nextSnippet() {
         for (int i = index() + 1; i < size(); i++) {
             if (get(i) instanceof NarrowingHistoryLine) {
                 moveTo(i);
                 return true;
             }
         }

         if (index() < size()) {
             moveToEnd();
             return true;
         }

         return false;
     }

     private static final String HISTORY_LINE_PREFIX = "HISTORY_LINE_";
     private static final String HISTORY_SNIPPET_START = "HISTORY_SNIPPET";

     public final void load() {
         try {
             Set<Integer> snippetsStart = new HashSet<>();
             for (String start : prefs.get(HISTORY_SNIPPET_START, "").split(";")) {
                 if (!start.isEmpty())
                     snippetsStart.add(Integer.parseInt(start));
             }
             List<String> keys = Stream.of(prefs.keys()).sorted().collect(Collectors.toList());
             NarrowingHistoryLine currentHistoryLine = null;
             int currentLine = 0;
             for (String key : keys) {
                 if (!key.startsWith(HISTORY_LINE_PREFIX))
                     continue;
                 CharSequence line = prefs.get(key, "");
                 if (snippetsStart.contains(currentLine)) {
                     class PersistentNarrowingHistoryLine extends NarrowingHistoryLine implements PersistentEntryMarker {
                         public PersistentNarrowingHistoryLine(CharSequence delegate, int start) {
                             super(delegate, start);
                         }
                     }
                     line = currentHistoryLine = new PersistentNarrowingHistoryLine(line, currentLine);
                 } else {
                     class PersistentLine implements CharSequence, PersistentEntryMarker {
                         private final CharSequence delegate;
                         public PersistentLine(CharSequence delegate) {
                             this.delegate = delegate;
                         }
                         @Override public int length() {
                             return delegate.length();
                         }
                         @Override public char charAt(int index) {
                             return delegate.charAt(index);
                         }
                         @Override public CharSequence subSequence(int start, int end) {
                             return delegate.subSequence(start, end);
                         }
                         @Override public String toString() {
                             return delegate.toString();
                         }
                     }
                     line = new PersistentLine(line);
                 }
                 if (currentHistoryLine != null)
                     currentHistoryLine.span[1] = currentLine;
                 currentLine++;
                 fullHistory.add(line);
             }
             currentLine = 0;
         } catch (BackingStoreException ex) {
             throw new IllegalStateException(ex);
         }
     }

     public void save() {
         try {
             for (String key : prefs.keys()) {
                 if (key.startsWith(HISTORY_LINE_PREFIX))
                     prefs.remove(key);
             }
             Iterator<Entry> entries = fullHistory.iterator();
             if (entries.hasNext()) {
                 int len = (int) Math.ceil(Math.log10(fullHistory.size()+1));
                 String format = HISTORY_LINE_PREFIX + "%0" + len + "d";
                 StringBuilder snippetStarts = new StringBuilder();
                 String snippetStartDelimiter = "";
                 while (entries.hasNext()) {
                     Entry entry = entries.next();
                     prefs.put(String.format(format, entry.index()), entry.value().toString());
                     if (entry.value() instanceof NarrowingHistoryLine) {
                         snippetStarts.append(snippetStartDelimiter);
                         snippetStarts.append(entry.index());
                         snippetStartDelimiter = ";";
                     }
                 }
                 prefs.put(HISTORY_SNIPPET_START, snippetStarts.toString());
             }
         } catch (BackingStoreException ex) {
             throw new IllegalStateException(ex);
         }
     }

     public List<String> currentSessionEntries() {
         List<String> result = new ArrayList<>();

         for (Entry e : fullHistory) {
             if (!(e.value() instanceof PersistentEntryMarker)) {
                 result.add(e.value().toString());
             }
         }

         return result;
     }

     void fullHistoryReplace(String source) {
         fullHistory.replace(source);
     }

     private class NarrowingHistoryLine implements CharSequence {
         private final CharSequence delegate;
         private final int[] span;

         public NarrowingHistoryLine(CharSequence delegate, int start) {
             this.delegate = delegate;
             this.span = new int[] {start, -1};
         }

         @Override
         public int length() {
             return delegate.length();
         }

         @Override
         public char charAt(int index) {
             return delegate.charAt(index);
         }

         @Override
         public CharSequence subSequence(int start, int end) {
             return delegate.subSequence(start, end);
         }

         @Override
         public String toString() {
             return delegate.toString();
         }

     }

     private interface PersistentEntryMarker {}
 }
	/*
	* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package jdk.internal.jshell.tool;

	import java.util.ArrayList;
	import java.util.HashSet;
	import java.util.Iterator;
	import java.util.List;
	import java.util.ListIterator;
	import java.util.Set;
	import java.util.prefs.BackingStoreException;
	import java.util.prefs.Preferences;
	import java.util.stream.Collectors;
	import java.util.stream.Stream;

	import jdk.internal.jline.console.history.History;
	import jdk.internal.jline.console.history.History.Entry;
	import jdk.internal.jline.console.history.MemoryHistory;
	import jdk.jshell.SourceCodeAnalysis.CompletionInfo;

	/*Public for tests (HistoryTest).
	*/
	public abstract class EditingHistory implements History {

	private final Preferences prefs;
	private final History fullHistory;
	private History currentDelegate;

	protected EditingHistory(Preferences prefs) {
	this.prefs = prefs;
	this.fullHistory = new MemoryHistory();
	this.currentDelegate = fullHistory;
	load();
	}

	@Override
	public int size() {
	return currentDelegate.size();
	}

	@Override
	public boolean isEmpty() {
	return currentDelegate.isEmpty();
	}

	@Override
	public int index() {
	return currentDelegate.index();
	}

	@Override
	public void clear() {
	if (currentDelegate != fullHistory)
	throw new IllegalStateException("narrowed");
	currentDelegate.clear();
	}

	@Override
	public CharSequence get(int index) {
	return currentDelegate.get(index);
	}

	@Override
	public void add(CharSequence line) {
	NarrowingHistoryLine currentLine = null;
	int origIndex = fullHistory.index();
	int fullSize;
	try {
	fullHistory.moveToEnd();
	fullSize = fullHistory.index();
	if (currentDelegate == fullHistory) {
	if (origIndex < fullHistory.index()) {
	for (Entry entry : fullHistory) {
	if (!(entry.value() instanceof NarrowingHistoryLine))
	continue;
	int[] cluster = ((NarrowingHistoryLine) entry.value()).span;
	if (cluster[0] == origIndex && cluster[1] > cluster[0]) {
	currentDelegate = new MemoryHistory();
	for (int i = cluster[0]; i <= cluster[1]; i++) {
	currentDelegate.add(fullHistory.get(i));
	}
	}
	}
	}
	}
	fullHistory.moveToEnd();
	while (fullHistory.previous()) {
	CharSequence c = fullHistory.current();
	if (c instanceof NarrowingHistoryLine) {
	currentLine = (NarrowingHistoryLine) c;
	break;
	}
	}
	} finally {
	fullHistory.moveTo(origIndex);
	}
	if (currentLine == null \|\| currentLine.span[1] != (-1)) {
	line = currentLine = new NarrowingHistoryLine(line, fullSize);
	}
	StringBuilder complete = new StringBuilder();
	for (int i = currentLine.span[0]; i < fullSize; i++) {
	complete.append(fullHistory.get(i));
	}
	complete.append(line);
	if (analyzeCompletion(complete.toString()).completeness.isComplete) {
	currentLine.span[1] = fullSize; //TODO: +1?
	currentDelegate = fullHistory;
	}
	fullHistory.add(line);
	}

	protected abstract CompletionInfo analyzeCompletion(String input);

	@Override
	public void set(int index, CharSequence item) {
	if (currentDelegate != fullHistory)
	throw new IllegalStateException("narrowed");
	currentDelegate.set(index, item);
	}

	@Override
	public CharSequence remove(int i) {
	if (currentDelegate != fullHistory)
	throw new IllegalStateException("narrowed");
	return currentDelegate.remove(i);
	}

	@Override
	public CharSequence removeFirst() {
	if (currentDelegate != fullHistory)
	throw new IllegalStateException("narrowed");
	return currentDelegate.removeFirst();
	}

	@Override
	public CharSequence removeLast() {
	if (currentDelegate != fullHistory)
	throw new IllegalStateException("narrowed");
	return currentDelegate.removeLast();
	}

	@Override
	public void replace(CharSequence item) {
	if (currentDelegate != fullHistory)
	throw new IllegalStateException("narrowed");
	currentDelegate.replace(item);
	}

	@Override
	public ListIterator<Entry> entries(int index) {
	return currentDelegate.entries(index);
	}

	@Override
	public ListIterator<Entry> entries() {
	return currentDelegate.entries();
	}

	@Override
	public Iterator<Entry> iterator() {
	return currentDelegate.iterator();
	}

	@Override
	public CharSequence current() {
	return currentDelegate.current();
	}

	@Override
	public boolean previous() {
	return currentDelegate.previous();
	}

	@Override
	public boolean next() {
	return currentDelegate.next();
	}

	@Override
	public boolean moveToFirst() {
	return currentDelegate.moveToFirst();
	}

	@Override
	public boolean moveToLast() {
	return currentDelegate.moveToLast();
	}

	@Override
	public boolean moveTo(int index) {
	return currentDelegate.moveTo(index);
	}

	@Override
	public void moveToEnd() {
	currentDelegate.moveToEnd();
	}

	public boolean previousSnippet() {
	for (int i = index() - 1; i >= 0; i--) {
	if (get(i) instanceof NarrowingHistoryLine) {
	moveTo(i);
	return true;
	}
	}

	return false;
	}

	public boolean nextSnippet() {
	for (int i = index() + 1; i < size(); i++) {
	if (get(i) instanceof NarrowingHistoryLine) {
	moveTo(i);
	return true;
	}
	}

	if (index() < size()) {
	moveToEnd();
	return true;
	}

	return false;
	}

	private static final String HISTORY_LINE_PREFIX = "HISTORY_LINE_";
	private static final String HISTORY_SNIPPET_START = "HISTORY_SNIPPET";

	public final void load() {
	try {
	Set<Integer> snippetsStart = new HashSet<>();
	for (String start : prefs.get(HISTORY_SNIPPET_START, "").split(";")) {
	if (!start.isEmpty())
	snippetsStart.add(Integer.parseInt(start));
	}
	List<String> keys = Stream.of(prefs.keys()).sorted().collect(Collectors.toList());
	NarrowingHistoryLine currentHistoryLine = null;
	int currentLine = 0;
	for (String key : keys) {
	if (!key.startsWith(HISTORY_LINE_PREFIX))
	continue;
	CharSequence line = prefs.get(key, "");
	if (snippetsStart.contains(currentLine)) {
	class PersistentNarrowingHistoryLine extends NarrowingHistoryLine implements PersistentEntryMarker {
	public PersistentNarrowingHistoryLine(CharSequence delegate, int start) {
	super(delegate, start);
	}
	}
	line = currentHistoryLine = new PersistentNarrowingHistoryLine(line, currentLine);
	} else {
	class PersistentLine implements CharSequence, PersistentEntryMarker {
	private final CharSequence delegate;
	public PersistentLine(CharSequence delegate) {
	this.delegate = delegate;
	}
	@Override public int length() {
	return delegate.length();
	}
	@Override public char charAt(int index) {
	return delegate.charAt(index);
	}
	@Override public CharSequence subSequence(int start, int end) {
	return delegate.subSequence(start, end);
	}
	@Override public String toString() {
	return delegate.toString();
	}
	}
	line = new PersistentLine(line);
	}
	if (currentHistoryLine != null)
	currentHistoryLine.span[1] = currentLine;
	currentLine++;
	fullHistory.add(line);
	}
	currentLine = 0;
	} catch (BackingStoreException ex) {
	throw new IllegalStateException(ex);
	}
	}

	public void save() {
	try {
	for (String key : prefs.keys()) {
	if (key.startsWith(HISTORY_LINE_PREFIX))
	prefs.remove(key);
	}
	Iterator<Entry> entries = fullHistory.iterator();
	if (entries.hasNext()) {
	int len = (int) Math.ceil(Math.log10(fullHistory.size()+1));
	String format = HISTORY_LINE_PREFIX + "%0" + len + "d";
	StringBuilder snippetStarts = new StringBuilder();
	String snippetStartDelimiter = "";
	while (entries.hasNext()) {
	Entry entry = entries.next();
	prefs.put(String.format(format, entry.index()), entry.value().toString());
	if (entry.value() instanceof NarrowingHistoryLine) {
	snippetStarts.append(snippetStartDelimiter);
	snippetStarts.append(entry.index());
	snippetStartDelimiter = ";";
	}
	}
	prefs.put(HISTORY_SNIPPET_START, snippetStarts.toString());
	}
	} catch (BackingStoreException ex) {
	throw new IllegalStateException(ex);
	}
	}

	public List<String> currentSessionEntries() {
	List<String> result = new ArrayList<>();

	for (Entry e : fullHistory) {
	if (!(e.value() instanceof PersistentEntryMarker)) {
	result.add(e.value().toString());
	}
	}

	return result;
	}

	void fullHistoryReplace(String source) {
	fullHistory.replace(source);
	}

	private class NarrowingHistoryLine implements CharSequence {
	private final CharSequence delegate;
	private final int[] span;

	public NarrowingHistoryLine(CharSequence delegate, int start) {
	this.delegate = delegate;
	this.span = new int[] {start, -1};
	}

	@Override
	public int length() {
	return delegate.length();
	}

	@Override
	public char charAt(int index) {
	return delegate.charAt(index);
	}

	@Override
	public CharSequence subSequence(int start, int end) {
	return delegate.subSequence(start, end);
	}

	@Override
	public String toString() {
	return delegate.toString();
	}

	}

	private interface PersistentEntryMarker {}
	}