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//
// StatefulCompletionTextEditorExtension.cs
//
// Author:
// Michael Hutchinson <mhutchinson@novell.com>
//
// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//#define DEBUG_DOCUMENT_STATE_ENGINE_TRACKER
using System;
using System.Collections.Generic;
using Mono.TextEditor;
namespace MonoDevelop.Ide.Gui.Content
{
public class DocumentStateTracker<T> : IDisposable where T : IDocumentStateEngine
{
T currentEngine;
Stack<T> cachedEngines = new Stack<T> ();
TextEditorData editor;
public DocumentStateTracker (T engine, TextEditorData editor)
{
this.currentEngine = engine;
this.editor = editor;
editor.Document.TextReplaced += textChanged;
}
public void Dispose ()
{
editor.Document.TextReplaced -= textChanged;
}
public T Engine {
get { return currentEngine; }
}
void textChanged (object sender, DocumentChangeEventArgs args)
{
if (args.Offset< currentEngine.Position)
ResetEngineToPosition (args.Offset);
}
public void ResetEngineToPosition (int position)
{
bool gotCachedEngine = false;
while (cachedEngines.Count > 0) {
T topEngine = cachedEngines.Peek ();
if (topEngine.Position <= position) {
currentEngine = (T) topEngine.Clone ();
gotCachedEngine = true;
ConsoleWrite ("Recovered state engine #{0}", cachedEngines.Count);
break;
} else {
cachedEngines.Pop ();
}
}
if (!gotCachedEngine) {
ConsoleWrite ("Did not recover a state engine", cachedEngines.Count);
currentEngine.Reset ();
}
}
public void UpdateEngine ()
{
UpdateEngine (editor.Caret.Offset);
}
//Makes sure that the smart indent engine's cursor has caught up with the
//text editor's cursor.
//The engine can take some time to parse the file, and we need it to be snappy
//so we keep a stack of old engines (they're fairly lightweight) that we can clone
//in order to quickly catch up.
public void UpdateEngine (int position)
{
//bigger buffer means fewer saved stacks needed
const int BUFFER_SIZE = 2000;
ConsoleWrite ("moving backwards if currentEngine.Position {0} > position {1}", currentEngine.Position, position);
if (currentEngine.Position == position) {
//positions match, nothing to be done
return;
} else if (currentEngine.Position > position) {
//moving backwards, so reset from previous saved location
ResetEngineToPosition (position);
}
// get the engine caught up
int nextSave = (cachedEngines.Count == 0)? BUFFER_SIZE : cachedEngines.Peek ().Position + BUFFER_SIZE;
if (currentEngine.Position + 1 == position) {
char ch = editor.Document.GetCharAt (currentEngine.Position);
currentEngine.Push (ch);
ConsoleWrite ("pushing character '{0}'", ch);
if (currentEngine.Position == nextSave)
cachedEngines.Push ((T) currentEngine.Clone ());
} else {
//bulk copy characters in case buffer is unmanaged
//(faster if we reduce managed/unmanaged transitions)
while (currentEngine.Position < position) {
int endCut = currentEngine.Position + BUFFER_SIZE;
if (endCut > position)
endCut = position;
string buffer = editor.Document.GetTextBetween (currentEngine.Position, endCut);
ConsoleWrite ("getting buffer between {0} and {1}" /* '{2}'"*/, currentEngine.Position, endCut - 1, buffer);
foreach (char ch in buffer) {
currentEngine.Push (ch);
//ConsoleWrite ("pushing character '{0}'", ch);
if (currentEngine.Position == nextSave) {
cachedEngines.Push ((T) currentEngine.Clone ());
nextSave += BUFFER_SIZE;
}
}
}
}
ConsoleWrite ("Now state engine is at {0}, doc is at {1}", currentEngine.Position, position);
}
[System.Diagnostics.Conditional("DEBUG_DOCUMENT_STATE_ENGINE_TRACKER")]
void ConsoleWrite (string message, params object[] args)
{
System.Console.Write ("DocumentStateTracker: ");
try {
System.Console.WriteLine (message, args);
} catch (Exception e) {
System.Console.WriteLine("\nError: Exception while formatting '{0}' for an array with {1} elements", message, args == null ? 0 : args.Length);
System.Console.WriteLine(e);
}
}
}
public interface IDocumentStateEngine : ICloneable
{
int Position { get; }
void Push (char c);
void Reset ();
}
}
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