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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 System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using Tango.Scripting.Editors.Document;
using Tango.Scripting.Editors.Utils;
namespace Tango.Scripting.Editors.Highlighting
{
/// <summary>
/// Represents a highlighted document line.
/// </summary>
public class HighlightedLine
{
/// <summary>
/// Creates a new HighlightedLine instance.
/// </summary>
public HighlightedLine(TextDocument document, DocumentLine documentLine)
{
if (document == null)
throw new ArgumentNullException("document");
if (!document.Lines.Contains(documentLine))
throw new ArgumentException("Line is null or not part of document");
this.Document = document;
this.DocumentLine = documentLine;
this.Sections = new NullSafeCollection<HighlightedSection>();
}
/// <summary>
/// Gets the document associated with this HighlightedLine.
/// </summary>
public TextDocument Document { get; private set; }
/// <summary>
/// Gets the document line associated with this HighlightedLine.
/// </summary>
public DocumentLine DocumentLine { get; private set; }
/// <summary>
/// Gets the highlighted sections.
/// The sections are not overlapping, but they may be nested.
/// In that case, outer sections come in the list before inner sections.
/// The sections are sorted by start offset.
/// </summary>
public IList<HighlightedSection> Sections { get; private set; }
/// <summary>
/// Gets the default color of all text outside a <see cref="HighlightedSection"/>.
/// </summary>
public HighlightingColor DefaultTextColor { get; set; }
sealed class HtmlElement : IComparable<HtmlElement>
{
internal readonly int Offset;
internal readonly int Nesting;
internal readonly bool IsEnd;
internal readonly HighlightingColor Color;
public HtmlElement(int offset, int nesting, bool isEnd, HighlightingColor color)
{
this.Offset = offset;
this.Nesting = nesting;
this.IsEnd = isEnd;
this.Color = color;
}
public int CompareTo(HtmlElement other)
{
int r = Offset.CompareTo(other.Offset);
if (r != 0)
return r;
if (IsEnd != other.IsEnd) {
if (IsEnd)
return -1;
else
return 1;
} else {
if (IsEnd)
return other.Nesting.CompareTo(Nesting);
else
return Nesting.CompareTo(other.Nesting);
}
}
}
/// <summary>
/// Produces HTML code for the line, with <span class="colorName"> tags.
/// </summary>
public string ToHtml(HtmlOptions options)
{
int startOffset = this.DocumentLine.Offset;
return ToHtml(startOffset, startOffset + this.DocumentLine.Length, options);
}
/// <summary>
/// Produces HTML code for a section of the line, with <span class="colorName"> tags.
/// </summary>
public string ToHtml(int startOffset, int endOffset, HtmlOptions options)
{
if (options == null)
throw new ArgumentNullException("options");
int documentLineStartOffset = this.DocumentLine.Offset;
int documentLineEndOffset = documentLineStartOffset + this.DocumentLine.Length;
if (startOffset < documentLineStartOffset || startOffset > documentLineEndOffset)
throw new ArgumentOutOfRangeException("startOffset", startOffset, "Value must be between " + documentLineStartOffset + " and " + documentLineEndOffset);
if (endOffset < startOffset || endOffset > documentLineEndOffset)
throw new ArgumentOutOfRangeException("endOffset", endOffset, "Value must be between startOffset and " + documentLineEndOffset);
ISegment requestedSegment = new SimpleSegment(startOffset, endOffset - startOffset);
List<HtmlElement> elements = new List<HtmlElement>();
for (int i = 0; i < this.Sections.Count; i++) {
HighlightedSection s = this.Sections[i];
if (s.GetOverlap(requestedSegment).Length > 0) {
elements.Add(new HtmlElement(s.Offset, i, false, s.Color));
elements.Add(new HtmlElement(s.Offset + s.Length, i, true, s.Color));
}
}
elements.Sort();
TextDocument document = this.Document;
StringWriter w = new StringWriter(CultureInfo.InvariantCulture);
int textOffset = startOffset;
foreach (HtmlElement e in elements) {
int newOffset = Math.Min(e.Offset, endOffset);
if (newOffset > startOffset) {
HtmlClipboard.EscapeHtml(w, document.GetText(textOffset, newOffset - textOffset), options);
}
textOffset = Math.Max(textOffset, newOffset);
if (options.ColorNeedsSpanForStyling(e.Color)) {
if (e.IsEnd) {
w.Write("</span>");
} else {
w.Write("<span");
options.WriteStyleAttributeForColor(w, e.Color);
w.Write('>');
}
}
}
HtmlClipboard.EscapeHtml(w, document.GetText(textOffset, endOffset - textOffset), options);
return w.ToString();
}
/// <inheritdoc/>
public override string ToString()
{
return "[" + GetType().Name + " " + ToHtml(new HtmlOptions()) + "]";
}
}
}
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