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78 lines (66 loc) · 2.42 KB
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// Copyright (c) Alexandre Mutel. All rights reserved.
// This file is licensed under the BSD-Clause 2 license.
// See the license.txt file in the project root for more information.
using Markdig.Helpers;
using Markdig.Syntax;
namespace Markdig.Renderers;
/// <summary>
/// A base class for rendering <see cref="Block" /> and <see cref="Syntax.Inlines.Inline" /> Markdown objects.
/// </summary>
/// <typeparam name="TRenderer">The type of the renderer.</typeparam>
/// <typeparam name="TObject">The type of the object.</typeparam>
/// <seealso cref="IMarkdownObjectRenderer" />
public abstract class MarkdownObjectRenderer<TRenderer, TObject> : IMarkdownObjectRenderer where TRenderer : RendererBase where TObject : MarkdownObject
{
private OrderedList<TryWriteDelegate>? _tryWriters;
/// <summary>
/// Performs the markdown object renderer operation.
/// </summary>
protected MarkdownObjectRenderer() { }
/// <summary>
/// Represents the bool type.
/// </summary>
public delegate bool TryWriteDelegate(TRenderer renderer, TObject obj);
/// <summary>
/// Performs the accept operation.
/// </summary>
public bool Accept(RendererBase renderer, Type objectType)
{
return typeof(TObject).IsAssignableFrom(objectType);
}
/// <summary>
/// Writes the object to the specified renderer.
/// </summary>
public virtual void Write(RendererBase renderer, MarkdownObject obj)
{
var typedRenderer = (TRenderer)renderer;
var typedObj = (TObject)obj;
if (_tryWriters is not null && TryWrite(typedRenderer, typedObj))
{
return;
}
Write(typedRenderer, typedObj);
}
private bool TryWrite(TRenderer renderer, TObject obj)
{
for (int i = 0; i < _tryWriters!.Count; i++)
{
var tryWriter = _tryWriters[i];
if (tryWriter(renderer, obj))
{
return true;
}
}
return false;
}
/// <summary>
/// Gets the optional writers attached to this instance.
/// </summary>
public OrderedList<TryWriteDelegate> TryWriters => _tryWriters ??= new();
/// <summary>
/// Writes the specified Markdown object to the renderer.
/// </summary>
/// <param name="renderer">The renderer.</param>
/// <param name="obj">The markdown object.</param>
protected abstract void Write(TRenderer renderer, TObject obj);
}