299 lines
12 KiB
C#
299 lines
12 KiB
C#
// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using Unity.CodeEditor.Document;
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using Unity.CodeEditor.Utils;
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namespace Unity.CodeEditor.Editing
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{
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/// <summary>
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/// Base class for selections.
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/// </summary>
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internal abstract class Selection
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{
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/// <summary>
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/// Creates a new simple selection that selects the text from startOffset to endOffset.
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/// </summary>
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internal static Selection Create(TextArea textArea, int startOffset, int endOffset)
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{
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if (textArea == null)
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throw new ArgumentNullException(nameof(textArea));
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if (startOffset == endOffset)
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return textArea.EmptySelection;
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return new SimpleSelection(textArea,
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new TextViewPosition(textArea.Document.GetLocation(startOffset)),
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new TextViewPosition(textArea.Document.GetLocation(endOffset)));
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}
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internal static Selection Create(TextArea textArea, TextViewPosition start, TextViewPosition end)
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{
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if (textArea == null)
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throw new ArgumentNullException(nameof(textArea));
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if (textArea.Document.GetOffset(start.Location) == textArea.Document.GetOffset(end.Location) && start.VisualColumn == end.VisualColumn)
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return textArea.EmptySelection;
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return new SimpleSelection(textArea, start, end);
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}
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/// <summary>
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/// Creates a new simple selection that selects the text in the specified segment.
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/// </summary>
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internal static Selection Create(TextArea textArea, ISegment segment)
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{
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if (segment == null)
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throw new ArgumentNullException(nameof(segment));
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return Create(textArea, segment.Offset, segment.EndOffset);
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}
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internal TextArea TextArea { get; }
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/// <summary>
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/// Constructor for Selection.
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/// </summary>
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protected Selection(TextArea textArea)
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{
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TextArea = textArea ?? throw new ArgumentNullException(nameof(textArea));
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}
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/// <summary>
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/// Gets the start position of the selection.
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/// </summary>
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internal abstract TextViewPosition StartPosition { get; }
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/// <summary>
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/// Gets the end position of the selection.
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/// </summary>
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internal abstract TextViewPosition EndPosition { get; }
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/// <summary>
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/// Gets the selected text segments.
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/// </summary>
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internal abstract IEnumerable<SelectionSegment> Segments { get; }
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/// <summary>
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/// Gets the smallest segment that contains all segments in this selection.
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/// May return null if the selection is empty.
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/// </summary>
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internal abstract ISegment SurroundingSegment { get; }
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/// <summary>
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/// Replaces the selection with the specified text.
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/// </summary>
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internal abstract void ReplaceSelectionWithText(string newText);
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internal string AddSpacesIfRequired(string newText, TextViewPosition start, TextViewPosition end)
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{
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if (EnableVirtualSpace && InsertVirtualSpaces(newText, start, end))
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{
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var line = TextArea.Document.GetLineByNumber(start.Line);
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var lineText = TextArea.Document.GetText(line);
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var vLine = TextArea.TextView.GetOrConstructVisualLine(line);
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var colDiff = start.VisualColumn - vLine.VisualLengthWithEndOfLineMarker;
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if (colDiff > 0)
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{
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var additionalSpaces = "";
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if (!TextArea.Options.ConvertTabsToSpaces && lineText.Trim('\t').Length == 0)
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{
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var tabCount = colDiff / TextArea.Options.IndentationSize;
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additionalSpaces = new string('\t', tabCount);
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colDiff -= tabCount * TextArea.Options.IndentationSize;
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}
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additionalSpaces += new string(' ', colDiff);
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return additionalSpaces + newText;
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}
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}
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return newText;
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}
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private bool InsertVirtualSpaces(string newText, TextViewPosition start, TextViewPosition end)
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{
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return (!string.IsNullOrEmpty(newText) || !(IsInVirtualSpace(start) && IsInVirtualSpace(end)))
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&& newText != "\r\n"
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&& newText != "\n"
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&& newText != "\r";
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}
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private bool IsInVirtualSpace(TextViewPosition pos)
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{
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return pos.VisualColumn > TextArea.TextView.GetOrConstructVisualLine(TextArea.Document.GetLineByNumber(pos.Line)).VisualLength;
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}
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/// <summary>
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/// Updates the selection when the document changes.
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/// </summary>
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internal abstract Selection UpdateOnDocumentChange(DocumentChangeEventArgs e);
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/// <summary>
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/// Gets whether the selection is empty.
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/// </summary>
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internal virtual bool IsEmpty => Length == 0;
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/// <summary>
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/// Gets whether virtual space is enabled for this selection.
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/// </summary>
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internal virtual bool EnableVirtualSpace => TextArea.Options.EnableVirtualSpace;
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/// <summary>
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/// Gets the selection length.
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/// </summary>
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internal abstract int Length { get; }
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/// <summary>
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/// Returns a new selection with the changed end point.
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/// </summary>
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/// <exception cref="NotSupportedException">Cannot set endpoint for empty selection</exception>
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internal abstract Selection SetEndpoint(TextViewPosition endPosition);
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/// <summary>
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/// If this selection is empty, starts a new selection from <paramref name="startPosition"/> to
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/// <paramref name="endPosition"/>, otherwise, changes the endpoint of this selection.
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/// </summary>
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internal abstract Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition);
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/// <summary>
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/// Gets whether the selection is multi-line.
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/// </summary>
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internal virtual bool IsMultiline
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{
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get
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{
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var surroundingSegment = SurroundingSegment;
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if (surroundingSegment == null)
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return false;
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var start = surroundingSegment.Offset;
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var end = start + surroundingSegment.Length;
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var document = TextArea.Document;
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if (document == null)
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throw ThrowUtil.NoDocumentAssigned();
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return document.GetLineByOffset(start) != document.GetLineByOffset(end);
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}
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}
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/// <summary>
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/// Gets the selected text.
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/// </summary>
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internal virtual string GetText()
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{
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var document = TextArea.Document;
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if (document == null)
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throw ThrowUtil.NoDocumentAssigned();
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StringBuilder b = null;
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string text = null;
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foreach (var s in Segments)
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{
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if (text != null)
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{
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if (b == null)
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b = new StringBuilder(text);
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else
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b.Append(text);
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}
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text = document.GetText(s);
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}
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if (b != null)
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{
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if (text != null) b.Append(text);
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return b.ToString();
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}
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else
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{
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return text ?? string.Empty;
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}
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}
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// TODO: html
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/// <summary>
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/// Creates a HTML fragment for the selected text.
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/// </summary>
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//public string CreateHtmlFragment(HtmlOptions options)
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//{
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// if (options == null)
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// throw new ArgumentNullException("options");
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// IHighlighter highlighter = textArea.GetService(typeof(IHighlighter)) as IHighlighter;
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// StringBuilder html = new StringBuilder();
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// bool first = true;
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// foreach (ISegment selectedSegment in this.Segments) {
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// if (first)
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// first = false;
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// else
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// html.AppendLine("<br>");
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// html.Append(HtmlClipboard.CreateHtmlFragment(textArea.Document, highlighter, selectedSegment, options));
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// }
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// return html.ToString();
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//}
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/// <inheritdoc/>
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public abstract override bool Equals(object obj);
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/// <inheritdoc/>
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public abstract override int GetHashCode();
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/// <summary>
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/// Gets whether the specified offset is included in the selection.
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/// </summary>
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/// <returns>True, if the selection contains the offset (selection borders inclusive);
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/// otherwise, false.</returns>
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internal virtual bool Contains(int offset)
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{
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if (IsEmpty)
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{
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return false;
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}
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return SurroundingSegment.Contains(offset, 0) &&
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Segments.Any(s => s.Contains(offset, 0));
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}
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// TODO: clipboard
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///// <summary>
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///// Creates a data object containing the selection's text.
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///// </summary>
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//public virtual DataObject CreateDataObject(TextArea textArea)
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//{
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// DataObject data = new DataObject();
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// // Ensure we use the appropriate newline sequence for the OS
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// string text = TextUtilities.NormalizeNewLines(GetText(), Environment.NewLine);
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// // Enable drag/drop to Word, Notepad++ and others
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// if (EditingCommandHandler.ConfirmDataFormat(textArea, data, DataFormats.UnicodeText)) {
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// data.SetText(text);
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// }
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// // Enable drag/drop to SciTe:
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// // We cannot use SetText, thus we need to use typeof(string).FullName as data format.
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// // new DataObject(object) calls SetData(object), which in turn calls SetData(Type, data),
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// // which then uses Type.FullName as format.
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// // We immitate that behavior here as well:
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// if (EditingCommandHandler.ConfirmDataFormat(textArea, data, typeof(string).FullName)) {
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// data.SetData(typeof(string).FullName, text);
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// }
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// // Also copy text in HTML format to clipboard - good for pasting text into Word
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// // or to the SharpDevelop forums.
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// if (EditingCommandHandler.ConfirmDataFormat(textArea, data, DataFormats.Html)) {
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// HtmlClipboard.SetHtml(data, CreateHtmlFragment(new HtmlOptions(textArea.Options)));
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// }
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// return data;
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//}
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}
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}
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