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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.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;
namespace Tango.Scripting.Editors.Highlighting
{
/// <summary>
/// Takes a series of highlighting commands and stores them.
/// Later, it can build inline objects (for use with WPF TextBlock) from the commands.
/// </summary>
/// <remarks>
/// This class is not used in AvalonEdit - but it is useful for someone who wants to put a HighlightedLine
/// into a TextBlock.
/// In SharpDevelop, we use it to provide syntax highlighting inside the search results pad.
/// </remarks>
public sealed class HighlightedInlineBuilder
{
sealed class HighlightingState
{
internal Brush Foreground;
internal Brush Background;
internal FontFamily Family;
internal FontWeight? Weight;
internal FontStyle? Style;
public HighlightingState Clone()
{
return new HighlightingState {
Foreground = this.Foreground,
Background = this.Background,
Family = this.Family,
Weight = this.Weight,
Style = this.Style
};
}
}
readonly string text;
List<int> stateChangeOffsets = new List<int>();
List<HighlightingState> stateChanges = new List<HighlightingState>();
int GetIndexForOffset(int offset)
{
if (offset < 0 || offset > text.Length)
throw new ArgumentOutOfRangeException("offset");
int index = stateChangeOffsets.BinarySearch(offset);
if (index < 0) {
index = ~index;
if (offset < text.Length) {
stateChanges.Insert(index, stateChanges[index - 1].Clone());
stateChangeOffsets.Insert(index, offset);
}
}
return index;
}
/// <summary>
/// Creates a new HighlightedInlineBuilder instance.
/// </summary>
public HighlightedInlineBuilder(string text)
{
if (text == null)
throw new ArgumentNullException("text");
this.text = text;
stateChangeOffsets.Add(0);
stateChanges.Add(new HighlightingState());
}
HighlightedInlineBuilder(string text, int[] offsets, HighlightingState[] states)
{
this.text = text;
stateChangeOffsets.AddRange(offsets);
stateChanges.AddRange(states);
}
/// <summary>
/// Gets the text.
/// </summary>
public string Text {
get { return text; }
}
/// <summary>
/// Applies the properties from the HighlightingColor to the specified text segment.
/// </summary>
public void SetHighlighting(int offset, int length, HighlightingColor color)
{
if (color == null)
throw new ArgumentNullException("color");
if (color.Foreground == null && color.FontStyle == null && color.FontWeight == null) {
// Optimization: don't split the HighlightingState when we're not changing
// any property. For example, the "Punctuation" color in C# is
// empty by default.
return;
}
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++) {
HighlightingState state = stateChanges[i];
if (color.Foreground != null)
state.Foreground = color.Foreground.GetBrush(null);
if (color.Background != null)
state.Background = color.Background.GetBrush(null);
if (color.FontStyle != null)
state.Style = color.FontStyle;
if (color.FontWeight != null)
state.Weight = color.FontWeight;
}
}
/// <summary>
/// Sets the foreground brush on the specified text segment.
/// </summary>
public void SetForeground(int offset, int length, Brush brush)
{
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++) {
stateChanges[i].Foreground = brush;
}
}
/// <summary>
/// Sets the background brush on the specified text segment.
/// </summary>
public void SetBackground(int offset, int length, Brush brush)
{
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++) {
stateChanges[i].Background = brush;
}
}
/// <summary>
/// Sets the font weight on the specified text segment.
/// </summary>
public void SetFontWeight(int offset, int length, FontWeight weight)
{
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++) {
stateChanges[i].Weight = weight;
}
}
/// <summary>
/// Sets the font style on the specified text segment.
/// </summary>
public void SetFontStyle(int offset, int length, FontStyle style)
{
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++) {
stateChanges[i].Style = style;
}
}
/// <summary>
/// Sets the font family on the specified text segment.
/// </summary>
public void SetFontFamily(int offset, int length, FontFamily family)
{
int startIndex = GetIndexForOffset(offset);
int endIndex = GetIndexForOffset(offset + length);
for (int i = startIndex; i < endIndex; i++) {
stateChanges[i].Family = family;
}
}
/// <summary>
/// Creates WPF Run instances that can be used for TextBlock.Inlines.
/// </summary>
public Run[] CreateRuns()
{
Run[] runs = new Run[stateChanges.Count];
for (int i = 0; i < runs.Length; i++) {
int startOffset = stateChangeOffsets[i];
int endOffset = i + 1 < stateChangeOffsets.Count ? stateChangeOffsets[i + 1] : text.Length;
Run r = new Run(text.Substring(startOffset, endOffset - startOffset));
HighlightingState state = stateChanges[i];
if (state.Foreground != null)
r.Foreground = state.Foreground;
if (state.Background != null)
r.Background = state.Background;
if (state.Weight != null)
r.FontWeight = state.Weight.Value;
if (state.Family != null)
r.FontFamily = state.Family;
if (state.Style != null)
r.FontStyle = state.Style.Value;
runs[i] = r;
}
return runs;
}
/// <summary>
/// Clones this HighlightedInlineBuilder.
/// </summary>
public HighlightedInlineBuilder Clone()
{
return new HighlightedInlineBuilder(this.text,
stateChangeOffsets.ToArray(),
stateChanges.Select(sc => sc.Clone()).ToArray());
}
}
}
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