91 lines
2.9 KiB
C#
91 lines
2.9 KiB
C#
// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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using System;
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using System.IO;
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using System.Threading;
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using Markdig;
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using Markdig.Renderers;
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using Markdig.Syntax;
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namespace Microsoft.PowerShell.MarkdownRender
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{
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/// <summary>
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/// Renderer for adding VT100 escape sequences for items in a list block.
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/// </summary>
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internal class ListItemBlockRenderer : VT100ObjectRenderer<ListItemBlock>
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{
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protected override void Write(VT100Renderer renderer, ListItemBlock obj)
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{
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var parent = obj.Parent as ListBlock;
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if (parent != null)
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{
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if (!parent.IsOrdered)
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{
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foreach (var line in obj)
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{
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RenderWithIndent(renderer, line, parent.BulletType, 0);
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}
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}
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}
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}
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private void RenderWithIndent(VT100Renderer renderer, MarkdownObject block, char listBullet, int indentLevel)
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{
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// Indent left by 2 for each level on list.
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string indent = Padding(indentLevel * 2);
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var paragraphBlock = block as ParagraphBlock;
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if (paragraphBlock != null)
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{
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renderer.Write(indent).Write(listBullet).Write(" ").Write(paragraphBlock.Inline);
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}
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else
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{
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// If there is a sublist, the block is a ListBlock instead of ParagraphBlock.
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var subList = block as ListBlock;
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if (subList != null)
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{
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foreach (var subListItem in subList)
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{
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var subListItemBlock = subListItem as ListItemBlock;
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if (subListItemBlock != null)
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{
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foreach (var line in subListItemBlock)
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{
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// Increment indent level for sub list.
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RenderWithIndent(renderer, line, listBullet, indentLevel + 1);
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}
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}
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}
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}
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}
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}
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// Typical padding is at most a screen's width, any more than that and we won't bother caching.
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private const int IndentCacheMax = 120;
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private static readonly string[] IndentCache = new string[IndentCacheMax];
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internal static string Padding(int countOfSpaces)
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{
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if (countOfSpaces >= IndentCacheMax)
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{
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return new string(' ', countOfSpaces);
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}
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var result = IndentCache[countOfSpaces];
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if (result == null)
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{
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Interlocked.CompareExchange(ref IndentCache[countOfSpaces], new string(' ', countOfSpaces), comparand : null);
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result = IndentCache[countOfSpaces];
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}
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return result;
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}
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}
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}
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