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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using Tango.Scripting.Editors.Document;
namespace Tango.Scripting.Editors.Indentation.CSharp
{
/// <summary>
/// Smart indentation for C#.
/// </summary>
public class CSharpIndentationStrategy : DefaultIndentationStrategy
{
/// <summary>
/// Creates a new CSharpIndentationStrategy.
/// </summary>
public CSharpIndentationStrategy()
{
}
/// <summary>
/// Creates a new CSharpIndentationStrategy and initializes the settings using the text editor options.
/// </summary>
public CSharpIndentationStrategy(TextEditorOptions options)
{
this.IndentationString = options.IndentationString;
}
string indentationString = "\t";
/// <summary>
/// Gets/Sets the indentation string.
/// </summary>
public string IndentationString
{
get { return indentationString; }
set
{
if (string.IsNullOrEmpty(value))
throw new ArgumentException("Indentation string must not be null or empty");
indentationString = value;
}
}
/// <summary>
/// Performs indentation using the specified document accessor.
/// </summary>
/// <param name="document">Object used for accessing the document line-by-line</param>
/// <param name="keepEmptyLines">Specifies whether empty lines should be kept</param>
public void Indent(IDocumentAccessor document, bool keepEmptyLines)
{
if (document == null)
throw new ArgumentNullException("document");
IndentationSettings settings = new IndentationSettings();
settings.IndentString = this.IndentationString;
settings.LeaveEmptyLines = keepEmptyLines;
IndentationReformatter r = new IndentationReformatter();
r.Reformat(document, settings);
}
/// <inheritdoc cref="IIndentationStrategy.IndentLine"/>
public override void IndentLine(TextDocument document, DocumentLine line)
{
bool keepEmptyLines = true;
if (line.PreviousLine != null && line.NextLine != null)
{
string previous_text = document.GetText(line.PreviousLine.Offset, line.PreviousLine.Length);
string next_text = document.GetText(line.NextLine.Offset, line.NextLine.Length);
if (previous_text.Contains("{") && next_text.Contains("}") && previous_text.Length == next_text.Length)
{
keepEmptyLines = false;
}
}
int lineNr = line.LineNumber;
TextDocumentAccessor acc = new TextDocumentAccessor(document, lineNr, lineNr);
Indent(acc, keepEmptyLines);
string t = acc.Text;
if (t.Length == 0)
{
// use AutoIndentation for new lines in comments / verbatim strings.
base.IndentLine(document, line);
}
}
/// <inheritdoc cref="IIndentationStrategy.IndentLines"/>
public override void IndentLines(TextDocument document, int beginLine, int endLine)
{
Indent(new TextDocumentAccessor(document, beginLine, endLine), true);
}
}
}
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