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//
// CacheIndentEngine.cs
//
// Author:
// Matej Miklečić <matej.miklecic@gmail.com>
//
// Copyright (c) 2013 Matej Miklečić (matej.miklecic@gmail.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.
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
namespace ICSharpCode.NRefactory6.CSharp
{
/// <summary>
/// Represents a decorator of an IStateMachineIndentEngine instance that provides
/// logic for reseting and updating the engine on text changed events.
/// </summary>
/// <remarks>
/// The decorator is based on periodical caching of the engine's state and
/// delegating all logic behind indentation to the currently active engine.
/// </remarks>
class CacheIndentEngine : IStateMachineIndentEngine
{
#region Properties
IStateMachineIndentEngine currentEngine;
Stack<IStateMachineIndentEngine> cachedEngines = new Stack<IStateMachineIndentEngine>();
#endregion
#region Constructors
/// <summary>
/// Creates a new CacheIndentEngine instance.
/// </summary>
/// <param name="decoratedEngine">
/// An instance of <see cref="IStateMachineIndentEngine"/> to which the
/// logic for indentation will be delegated.
/// </param>
/// <param name="cacheRate">
/// The number of chars between caching.
/// </param>
public CacheIndentEngine(IStateMachineIndentEngine decoratedEngine, int cacheRate = 2000)
{
this.currentEngine = decoratedEngine;
}
/// <summary>
/// Creates a new CacheIndentEngine instance from the given prototype.
/// </summary>
/// <param name="prototype">
/// A CacheIndentEngine instance.
/// </param>
public CacheIndentEngine(CacheIndentEngine prototype)
{
this.currentEngine = prototype.currentEngine.Clone();
}
#endregion
#region IDocumentIndentEngine
/// <inheritdoc />
public string ThisLineIndent {
get { return currentEngine.ThisLineIndent; }
}
/// <inheritdoc />
public string NextLineIndent {
get { return currentEngine.NextLineIndent; }
}
/// <inheritdoc />
public string CurrentIndent {
get { return currentEngine.CurrentIndent; }
}
/// <inheritdoc />
public bool NeedsReindent {
get { return currentEngine.NeedsReindent; }
}
/// <inheritdoc />
public int Offset {
get { return currentEngine.Offset; }
}
// /// <inheritdoc />
// public TextLocation Location {
// get { return currentEngine.Location; }
// }
/// <inheritdoc />
public bool EnableCustomIndentLevels
{
get { return currentEngine.EnableCustomIndentLevels; }
set { currentEngine.EnableCustomIndentLevels = value; }
}
/// <inheritdoc />
public void Push(char ch)
{
currentEngine.Push(ch);
}
/// <inheritdoc />
public void Reset()
{
currentEngine.Reset();
cachedEngines.Clear();
}
/// <summary>
/// Resets the engine to offset. Clears all cached engines after the given offset.
/// </summary>
public void ResetEngineToPosition(SourceText sourceText, int offset)
{
// We are already there
if (currentEngine.Offset <= offset)
return;
bool gotCachedEngine = false;
while (cachedEngines.Count > 0) {
var topEngine = cachedEngines.Peek();
if (topEngine.Offset <= offset) {
currentEngine = topEngine.Clone();
gotCachedEngine = true;
break;
} else {
cachedEngines.Pop();
}
}
if (!gotCachedEngine)
currentEngine.Reset();
}
/// <inheritdoc />
/// <remarks>
/// If the <paramref name="position"/> is negative, the engine will
/// update to: document.TextLength + (offset % document.TextLength+1)
/// Otherwise it will update to: offset % document.TextLength+1
/// </remarks>
public void Update(SourceText sourceText, int position)
{
const int BUFFER_SIZE = 2000;
if (currentEngine.Offset == position) {
//positions match, nothing to be done
return;
} else if (currentEngine.Offset > position) {
//moving backwards, so reset from previous saved location
ResetEngineToPosition(sourceText, position);
}
// get the engine caught up
int nextSave = (cachedEngines.Count == 0) ? BUFFER_SIZE : cachedEngines.Peek().Offset + BUFFER_SIZE;
if (currentEngine.Offset + 1 == position) {
char ch = sourceText[currentEngine.Offset];
currentEngine.Push(ch);
if (currentEngine.Offset == nextSave)
cachedEngines.Push(currentEngine.Clone());
} else {
//bulk copy characters in case buffer is unmanaged
//(faster if we reduce managed/unmanaged transitions)
while (currentEngine.Offset < position) {
int endCut = currentEngine.Offset + BUFFER_SIZE;
if (endCut > position)
endCut = position;
string buffer = sourceText.GetSubText(TextSpan.FromBounds(currentEngine.Offset, endCut)).ToString();
foreach (char ch in buffer) {
currentEngine.Push(ch);
//ConsoleWrite ("pushing character '{0}'", ch);
if (currentEngine.Offset == nextSave) {
cachedEngines.Push(currentEngine.Clone());
nextSave += BUFFER_SIZE;
}
}
}
}
}
//public IStateMachineIndentEngine GetEngine(int offset)
//{
// ResetEngineToPosition(offset);
// return currentEngine;
//}
#endregion
#region IClonable
/// <inheritdoc />
public IStateMachineIndentEngine Clone()
{
return new CacheIndentEngine(this);
}
/// <inheritdoc />
IDocumentIndentEngine IDocumentIndentEngine.Clone()
{
return Clone();
}
object ICloneable.Clone()
{
return Clone();
}
#endregion
#region IStateMachineIndentEngine
public bool IsInsidePreprocessorDirective {
get { return currentEngine.IsInsidePreprocessorDirective; }
}
public bool IsInsidePreprocessorComment {
get { return currentEngine.IsInsidePreprocessorComment; }
}
public bool IsInsideStringLiteral {
get { return currentEngine.IsInsideStringLiteral; }
}
public bool IsInsideVerbatimString {
get { return currentEngine.IsInsideVerbatimString; }
}
public bool IsInsideCharacter {
get { return currentEngine.IsInsideCharacter; }
}
public bool IsInsideString {
get { return currentEngine.IsInsideString; }
}
public bool IsInsideLineComment {
get { return currentEngine.IsInsideLineComment; }
}
public bool IsInsideMultiLineComment {
get { return currentEngine.IsInsideMultiLineComment; }
}
public bool IsInsideDocLineComment {
get { return currentEngine.IsInsideDocLineComment; }
}
public bool IsInsideComment {
get { return currentEngine.IsInsideComment; }
}
public bool IsInsideOrdinaryComment {
get { return currentEngine.IsInsideOrdinaryComment; }
}
public bool IsInsideOrdinaryCommentOrString {
get { return currentEngine.IsInsideOrdinaryCommentOrString; }
}
public bool LineBeganInsideVerbatimString {
get { return currentEngine.LineBeganInsideVerbatimString; }
}
public bool LineBeganInsideMultiLineComment {
get { return currentEngine.LineBeganInsideMultiLineComment; }
}
#endregion
}
/*
/ // <summary>
/// Represents a decorator of an IStateMachineIndentEngine instance that provides
/// logic for reseting and updating the engine on text changed events.
/// </summary>
/// <remarks>
/// The decorator is based on periodical caching of the engine's state and
/// delegating all logic behind indentation to the currently active engine.
/// </remarks>
class CacheIndentEngine : IStateMachineIndentEngine
{
#region Properties
/// <summary>
/// Represents the cache interval in number of chars pushed to the engine.
/// </summary>
/// <remarks>
/// When this many new chars are pushed to the engine, the currently active
/// engine gets cloned and added to the end of <see cref="cachedEngines"/>.
/// </remarks>
readonly int cacheRate;
/// <summary>
/// Determines how much memory to reserve on initialization for the
/// cached engines.
/// </summary>
const int cacheCapacity = 25;
/// <summary>
/// Currently active engine.
/// </summary>
/// <remarks>
/// Should be equal to the last engine in <see cref="cachedEngines"/>.
/// </remarks>
IStateMachineIndentEngine currentEngine;
/// <summary>
/// List of cached engines sorted ascending by
/// <see cref="IDocumentIndentEngine.Offset"/>.
/// </summary>
IStateMachineIndentEngine[] cachedEngines;
/// <summary>
/// The index of the last cached engine in cachedEngines.
/// </summary>
/// <remarks>
/// Should be equal to: currentEngine.Offset / CacheRate
/// </remarks>
int lastCachedEngine;
#endregion
#region Constructors
/// <summary>
/// Creates a new CacheIndentEngine instance.
/// </summary>
/// <param name="decoratedEngine">
/// An instance of <see cref="IStateMachineIndentEngine"/> to which the
/// logic for indentation will be delegated.
/// </param>
/// <param name="cacheRate">
/// The number of chars between caching.
/// </param>
public CacheIndentEngine(IStateMachineIndentEngine decoratedEngine, int cacheRate = 2000)
{
this.cachedEngines = new IStateMachineIndentEngine[cacheCapacity];
this.cachedEngines[0] = decoratedEngine.Clone();
this.currentEngine = this.cachedEngines[0].Clone();
this.cacheRate = cacheRate;
}
/// <summary>
/// Creates a new CacheIndentEngine instance from the given prototype.
/// </summary>
/// <param name="prototype">
/// A CacheIndentEngine instance.
/// </param>
public CacheIndentEngine(CacheIndentEngine prototype)
{
this.cachedEngines = new IStateMachineIndentEngine[prototype.cachedEngines.Length];
Array.Copy(prototype.cachedEngines, this.cachedEngines, prototype.cachedEngines.Length);
this.lastCachedEngine = prototype.lastCachedEngine;
this.currentEngine = prototype.currentEngine.Clone();
this.cacheRate = prototype.cacheRate;
}
#endregion
#region Methods
/// <summary>
/// Performs caching of the <see cref="CacheIndentEngine.currentEngine"/>.
/// </summary>
void cache()
{
if (currentEngine.Offset % cacheRate != 0)
{
throw new Exception("The current engine's offset is not divisable with the cacheRate.");
}
// determine the new current engine from cachedEngines
lastCachedEngine = currentEngine.Offset / cacheRate;
if (cachedEngines.Length < lastCachedEngine + 1)
{
Array.Resize(ref cachedEngines, lastCachedEngine * 2);
}
cachedEngines[lastCachedEngine] = currentEngine.Clone();
}
#endregion
#region IDocumentIndentEngine
/// <inheritdoc />
public IDocument Document
{
get { return currentEngine.Document; }
}
/// <inheritdoc />
public string ThisLineIndent
{
get { return currentEngine.ThisLineIndent; }
}
/// <inheritdoc />
public string NextLineIndent
{
get { return currentEngine.NextLineIndent; }
}
/// <inheritdoc />
public string CurrentIndent
{
get { return currentEngine.CurrentIndent; }
}
/// <inheritdoc />
public bool NeedsReindent
{
get { return currentEngine.NeedsReindent; }
}
/// <inheritdoc />
public int Offset
{
get { return currentEngine.Offset; }
}
/// <inheritdoc />
public TextLocation Location
{
get { return currentEngine.Location; }
}
/// <inheritdoc />
public void Push(char ch)
{
currentEngine.Push(ch);
if (currentEngine.Offset % cacheRate == 0)
{
cache();
}
}
/// <inheritdoc />
public void Reset()
{
currentEngine = cachedEngines[lastCachedEngine = 0];
}
/// <inheritdoc />
/// <remarks>
/// If the <paramref name="offset"/> is negative, the engine will
/// update to: document.TextLength + (offset % document.TextLength+1)
/// Otherwise it will update to: offset % document.TextLength+1
/// </remarks>
public void Update(int offset)
{
// map the given offset to the [0, document.TextLength] interval
// using modulo arithmetics
offset %= Document.TextLength + 1;
if (offset < 0)
{
offset += Document.TextLength + 1;
}
// check if the engine has to be updated to some previous offset
if (currentEngine.Offset > offset)
{
// replace the currentEngine with the first one whose offset
// is less then the given <paramref name="offset"/>
lastCachedEngine = offset / cacheRate;
currentEngine = cachedEngines[lastCachedEngine].Clone();
}
// update the engine to the given offset
while (Offset < offset)
{
Push(Document.GetCharAt(Offset));
}
}
public IStateMachineIndentEngine GetEngine(int offset)
{
// map the given offset to the [0, document.TextLength] interval
// using modulo arithmetics
offset %= Document.TextLength + 1;
if (offset < 0)
{
offset += Document.TextLength + 1;
}
// check if the engine has to be updated to some previous offset
if (currentEngine.Offset > offset)
{
// replace the currentEngine with the first one whose offset
// is less then the given <paramref name="offset"/>
lastCachedEngine = offset / cacheRate;
return cachedEngines[lastCachedEngine].Clone();
}
return currentEngine;
}
#endregion
#region IClonable
/// <inheritdoc />
public IStateMachineIndentEngine Clone()
{
return new CacheIndentEngine(this);
}
/// <inheritdoc />
IDocumentIndentEngine IDocumentIndentEngine.Clone()
{
return Clone();
}
object ICloneable.Clone()
{
return Clone();
}
#endregion
#region IStateMachineIndentEngine
public bool IsInsidePreprocessorDirective
{
get { return currentEngine.IsInsidePreprocessorDirective; }
}
public bool IsInsidePreprocessorComment
{
get { return currentEngine.IsInsidePreprocessorComment; }
}
public bool IsInsideStringLiteral
{
get { return currentEngine.IsInsideStringLiteral; }
}
public bool IsInsideVerbatimString
{
get { return currentEngine.IsInsideVerbatimString; }
}
public bool IsInsideCharacter
{
get { return currentEngine.IsInsideCharacter; }
}
public bool IsInsideString
{
get { return currentEngine.IsInsideString; }
}
public bool IsInsideLineComment
{
get { return currentEngine.IsInsideLineComment; }
}
public bool IsInsideMultiLineComment
{
get { return currentEngine.IsInsideMultiLineComment; }
}
public bool IsInsideDocLineComment
{
get { return currentEngine.IsInsideDocLineComment; }
}
public bool IsInsideComment
{
get { return currentEngine.IsInsideComment; }
}
public bool IsInsideOrdinaryComment
{
get { return currentEngine.IsInsideOrdinaryComment; }
}
public bool IsInsideOrdinaryCommentOrString
{
get { return currentEngine.IsInsideOrdinaryCommentOrString; }
}
public bool LineBeganInsideVerbatimString
{
get { return currentEngine.LineBeganInsideVerbatimString; }
}
public bool LineBeganInsideMultiLineComment
{
get { return currentEngine.LineBeganInsideMultiLineComment; }
}
#endregion
}
*/
}
|