mirror of
https://github.com/MindWorkAI/AI-Studio.git
synced 2025-02-05 22:29:07 +00:00
501 lines
14 KiB
C#
501 lines
14 KiB
C#
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using Markdig.Extensions.Mathematics;
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using Markdig.Extensions.Tables;
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using Markdig.Syntax;
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using Markdig.Syntax.Inlines;
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using Microsoft.AspNetCore.Components.Routing;
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using Microsoft.AspNetCore.Components.Web;
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// ReSharper disable MemberCanBePrivate.Global
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namespace MudBlazor;
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public class MudMarkdown : ComponentBase, IDisposable
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{
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protected IMudMarkdownThemeService? ThemeService;
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protected MarkdownPipeline? Pipeline;
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protected bool EnableLinkNavigation;
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protected int ElementIndex;
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/// <summary>
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/// Markdown text to be rendered in the component.
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/// </summary>
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[Parameter]
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public string Value { get; set; } = string.Empty;
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/// <summary>
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/// Minimum width (in pixels) for a table cell.<br/>
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/// If <see langword="null" /> or negative the minimum width is not applied.
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/// </summary>
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[Parameter]
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public int? TableCellMinWidth { get; set; }
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/// <summary>
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/// Command which is invoked when a link is clicked.<br/>
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/// If <see langword="null" /> a link is opened in the browser.
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/// </summary>
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[Parameter]
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public ICommand? LinkCommand { get; set; }
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/// <summary>
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/// Theme of the code block.<br/>
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/// Browse available themes here: https://highlightjs.org/static/demo/
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/// </summary>
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[Parameter]
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public CodeBlockTheme CodeBlockTheme { get; set; }
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/// <summary>
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/// Override the original URL address of the <see cref="LinkInline"/>.<br/>
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/// If a function is not provided <see cref="LinkInline.Url"/> is used
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/// </summary>
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[Parameter]
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public Func<LinkInline, string?>? OverrideLinkUrl { get; set; }
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/// <summary>
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/// Typography variant to use for Heading Level 1-6.<br/>
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/// If a function is not provided a default typo for each level is set (e.g. for <h1> it will be <see cref="Typo.h1"/>, etc.)
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/// </summary>
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[Parameter]
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public Func<Typo, Typo>? OverrideHeaderTypo { get; set; }
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/// <summary>
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/// Override default styling of the markdown component
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/// </summary>
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[Parameter]
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public MudMarkdownStyling Styling { get; set; } = new();
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[Parameter]
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public MarkdownPipeline? MarkdownPipeline { get; set; }
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[Inject]
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protected NavigationManager? NavigationManager { get; init; }
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[Inject]
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protected IJSRuntime JsRuntime { get; init; } = default!;
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[Inject]
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protected IServiceProvider? ServiceProvider { get; init; }
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public virtual void Dispose()
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{
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if (NavigationManager != null)
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NavigationManager.LocationChanged -= NavigationManagerOnLocationChanged;
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if (ThemeService != null)
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ThemeService.CodeBlockThemeChanged -= OnCodeBlockThemeChanged;
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GC.SuppressFinalize(this);
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}
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protected override void BuildRenderTree(RenderTreeBuilder builder)
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{
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if (string.IsNullOrEmpty(Value))
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return;
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ElementIndex = 0;
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var pipeline = GetMarkdownPipeLine();
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var parsedText = Markdown.Parse(Value, pipeline);
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if (parsedText.Count == 0)
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return;
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builder.OpenElement(ElementIndex++, "article");
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builder.AddAttribute(ElementIndex++, "class", "mud-markdown-body");
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RenderMarkdown(parsedText, builder);
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builder.CloseElement();
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}
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protected override void OnInitialized()
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{
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base.OnInitialized();
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ThemeService = ServiceProvider?.GetService<IMudMarkdownThemeService>();
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if (ThemeService != null)
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ThemeService.CodeBlockThemeChanged += OnCodeBlockThemeChanged;
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}
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protected override void OnAfterRender(bool firstRender)
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{
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if (!firstRender || !EnableLinkNavigation || NavigationManager == null)
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return;
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var args = new LocationChangedEventArgs(NavigationManager.Uri, true);
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NavigationManagerOnLocationChanged(NavigationManager, args);
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NavigationManager.LocationChanged += NavigationManagerOnLocationChanged;
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}
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protected virtual void RenderMarkdown(ContainerBlock container, RenderTreeBuilder builder)
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{
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for (var i = 0; i < container.Count; i++)
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{
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switch (container[i])
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{
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case ParagraphBlock paragraph:
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{
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RenderParagraphBlock(paragraph, builder);
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break;
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}
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case HeadingBlock heading:
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{
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var typo = (Typo)heading.Level;
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typo = OverrideHeaderTypo?.Invoke(typo) ?? typo;
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EnableLinkNavigation = true;
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var id = heading.BuildIdString();
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RenderParagraphBlock(heading, builder, typo, id);
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break;
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}
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case QuoteBlock quote:
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{
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builder.OpenElement(ElementIndex++, "blockquote");
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RenderMarkdown(quote, builder);
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builder.CloseElement();
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break;
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}
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case Table table:
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{
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RenderTable(table, builder);
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break;
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}
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case ListBlock list:
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{
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RenderList(list, builder);
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break;
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}
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case ThematicBreakBlock:
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{
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builder.OpenComponent<MudDivider>(ElementIndex++);
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builder.CloseComponent();
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break;
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}
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case FencedCodeBlock code:
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{
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var text = code.CreateCodeBlockText();
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// Necessary to prevent Blazor from crashing when the code block is empty.
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// It seems that Blazor does not like empty attributes.
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if(string.IsNullOrWhiteSpace(text))
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break;
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builder.OpenComponent<MudCodeHighlight>(ElementIndex++);
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builder.AddAttribute(ElementIndex++, nameof(MudCodeHighlight.Text), text);
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builder.AddAttribute(ElementIndex++, nameof(MudCodeHighlight.Language), code.Info ?? string.Empty);
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builder.AddAttribute(ElementIndex++, nameof(MudCodeHighlight.Theme), CodeBlockTheme);
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builder.CloseComponent();
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break;
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}
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case HtmlBlock html:
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{
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if (html.TryGetDetails(out var detailsData))
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RenderDetailsHtml(builder, detailsData.Header, detailsData.Content);
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else
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RenderHtml(builder, html.Lines);
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break;
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}
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default:
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{
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OnRenderMarkdownBlockDefault(container[i]);
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break;
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}
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}
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}
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}
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/// <summary>
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/// Renders a markdown block which is not covered by the switch-case block in <see cref="RenderMarkdown"/>
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/// </summary>
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protected virtual void OnRenderMarkdownBlockDefault(Markdig.Syntax.Block block)
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{
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}
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protected virtual void RenderParagraphBlock(LeafBlock paragraph, RenderTreeBuilder builder, Typo typo = Typo.body1, string? id = null)
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{
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if (paragraph.Inline == null)
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return;
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builder.OpenComponent<MudText>(ElementIndex++);
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if (!string.IsNullOrEmpty(id))
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builder.AddAttribute(ElementIndex++, "id", id);
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builder.AddAttribute(ElementIndex++, nameof(MudText.Typo), typo);
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builder.AddAttribute(ElementIndex++, nameof(MudText.ChildContent), (RenderFragment)(contentBuilder => RenderInlines(paragraph.Inline, contentBuilder)));
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builder.CloseComponent();
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}
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protected virtual void RenderInlines(ContainerInline inlines, RenderTreeBuilder builder)
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{
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foreach (var inline in inlines)
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{
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switch (inline)
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{
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case LiteralInline x:
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{
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builder.AddContent(ElementIndex++, x.Content);
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break;
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}
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case HtmlInline x:
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{
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builder.AddMarkupContent(ElementIndex++, x.Tag);
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break;
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}
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case LineBreakInline:
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{
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builder.OpenElement(ElementIndex++, "br");
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builder.CloseElement();
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break;
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}
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case CodeInline x:
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{
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builder.OpenElement(ElementIndex++, "code");
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builder.AddContent(ElementIndex++, x.Content);
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builder.CloseElement();
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break;
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}
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case EmphasisInline x:
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{
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if (!x.TryGetEmphasisElement(out var elementName))
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continue;
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builder.OpenElement(ElementIndex++, elementName);
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RenderInlines(x, builder);
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builder.CloseElement();
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break;
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}
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case LinkInline x:
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{
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var url = OverrideLinkUrl?.Invoke(x) ?? x.Url;
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if (x.IsImage)
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{
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var alt = x
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.OfType<LiteralInline>()
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.Select(static x => x.Content);
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builder.OpenComponent<MudImage>(ElementIndex++);
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builder.AddAttribute(ElementIndex++, nameof(MudImage.Class), "rounded-lg");
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builder.AddAttribute(ElementIndex++, nameof(MudImage.Src), url);
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builder.AddAttribute(ElementIndex++, nameof(MudImage.Alt), string.Join(null, alt));
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builder.AddAttribute(ElementIndex++, nameof(MudImage.Elevation), 25);
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builder.CloseComponent();
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}
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else if (LinkCommand == null)
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{
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builder.OpenComponent<MudLink>(ElementIndex++);
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builder.AddAttribute(ElementIndex++, nameof(MudLink.Href), url);
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builder.AddAttribute(ElementIndex++, nameof(MudLink.ChildContent), (RenderFragment)(linkBuilder => RenderInlines(x, linkBuilder)));
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if (url.IsExternalUri(NavigationManager?.BaseUri))
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{
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builder.AddAttribute(ElementIndex++, nameof(MudLink.Target), "_blank");
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builder.AddAttribute(ElementIndex++, "rel", "noopener noreferrer");
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}
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// (prevent scrolling to the top of the page)
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// custom implementation only for links on the same page
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else if (url?.StartsWith('#') ?? false)
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{
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builder.AddEventPreventDefaultAttribute(ElementIndex++, "onclick", true);
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builder.AddAttribute(ElementIndex++, "onclick", EventCallback.Factory.Create<MouseEventArgs>(this, () =>
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{
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if (NavigationManager == null)
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return;
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var uriBuilder = new UriBuilder(NavigationManager.Uri)
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{
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Fragment = url,
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};
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var args = new LocationChangedEventArgs(uriBuilder.Uri.AbsoluteUri, true);
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NavigationManagerOnLocationChanged(NavigationManager, args);
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}));
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}
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builder.CloseComponent();
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}
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else
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{
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builder.OpenComponent<MudLinkButton>(ElementIndex++);
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builder.AddAttribute(ElementIndex++, nameof(MudLinkButton.Command), LinkCommand);
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builder.AddAttribute(ElementIndex++, nameof(MudLinkButton.CommandParameter), url);
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builder.AddAttribute(ElementIndex++, nameof(MudLinkButton.ChildContent), (RenderFragment)(linkBuilder => RenderInlines(x, linkBuilder)));
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builder.CloseComponent();
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}
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break;
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}
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case MathInline x:
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{
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builder.OpenComponent<MudMathJax>(ElementIndex++);
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builder.AddAttribute(ElementIndex++, nameof(MudMathJax.Delimiter), x.GetDelimiter());
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builder.AddAttribute(ElementIndex++, nameof(MudMathJax.Value), x.Content);
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builder.CloseComponent();
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break;
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}
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default:
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{
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OnRenderInlinesDefault(inline, builder);
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break;
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}
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}
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}
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}
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/// <summary>
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/// Renders inline block which is not covered by the switch-case block in <see cref="RenderInlines"/>
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/// </summary>
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protected virtual void OnRenderInlinesDefault(Inline inline, RenderTreeBuilder builder)
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{
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}
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protected virtual void RenderTable(Table table, RenderTreeBuilder builder)
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{
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// First child is columns
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if (table.Count < 2)
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return;
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builder.OpenComponent<MudSimpleTable>(ElementIndex++);
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builder.AddAttribute(ElementIndex++, nameof(MudSimpleTable.Style), "overflow-x: auto;");
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builder.AddAttribute(ElementIndex++, nameof(MudSimpleTable.Striped), Styling.Table.IsStriped);
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builder.AddAttribute(ElementIndex++, nameof(MudSimpleTable.Bordered), Styling.Table.IsBordered);
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builder.AddAttribute(ElementIndex++, nameof(MudSimpleTable.Elevation), Styling.Table.Elevation);
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builder.AddAttribute(ElementIndex++, nameof(MudSimpleTable.ChildContent), (RenderFragment)(contentBuilder =>
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{
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// thread
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contentBuilder.OpenElement(ElementIndex++, "thead");
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RenderTableRow((TableRow)table[0], "th", contentBuilder, TableCellMinWidth);
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contentBuilder.CloseElement();
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// tbody
|
|||
|
|
contentBuilder.OpenElement(ElementIndex++, "tbody");
|
|||
|
|
for (var j = 1; j < table.Count; j++)
|
|||
|
|
{
|
|||
|
|
RenderTableRow((TableRow)table[j], "td", contentBuilder);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
contentBuilder.CloseElement();
|
|||
|
|
}));
|
|||
|
|
builder.CloseComponent();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
protected virtual void RenderTableRow(TableRow row, string cellElementName, RenderTreeBuilder builder, int? minWidth = null)
|
|||
|
|
{
|
|||
|
|
builder.OpenElement(ElementIndex++, "tr");
|
|||
|
|
|
|||
|
|
for (var j = 0; j < row.Count; j++)
|
|||
|
|
{
|
|||
|
|
var cell = (TableCell)row[j];
|
|||
|
|
builder.OpenElement(ElementIndex++, cellElementName);
|
|||
|
|
|
|||
|
|
if (minWidth is > 0)
|
|||
|
|
builder.AddAttribute(ElementIndex++, "style", $"min-width:{minWidth}px");
|
|||
|
|
|
|||
|
|
if (cell.Count != 0 && cell[0] is ParagraphBlock paragraphBlock)
|
|||
|
|
RenderParagraphBlock(paragraphBlock, builder);
|
|||
|
|
|
|||
|
|
builder.CloseElement();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
builder.CloseElement();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
protected virtual void RenderList(ListBlock list, RenderTreeBuilder builder)
|
|||
|
|
{
|
|||
|
|
if (list.Count == 0)
|
|||
|
|
return;
|
|||
|
|
|
|||
|
|
var elementName = list.IsOrdered ? "ol" : "ul";
|
|||
|
|
var orderStart = list.OrderedStart.ParseOrDefault();
|
|||
|
|
|
|||
|
|
builder.OpenElement(ElementIndex++, elementName);
|
|||
|
|
|
|||
|
|
if (orderStart > 1)
|
|||
|
|
{
|
|||
|
|
builder.AddAttribute(ElementIndex++, "start", orderStart);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
for (var i = 0; i < list.Count; i++)
|
|||
|
|
{
|
|||
|
|
var block = (ListItemBlock)list[i];
|
|||
|
|
|
|||
|
|
for (var j = 0; j < block.Count; j++)
|
|||
|
|
{
|
|||
|
|
switch (block[j])
|
|||
|
|
{
|
|||
|
|
case ListBlock x:
|
|||
|
|
{
|
|||
|
|
RenderList(x, builder);
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
case ParagraphBlock x:
|
|||
|
|
{
|
|||
|
|
builder.OpenElement(ElementIndex++, "li");
|
|||
|
|
RenderParagraphBlock(x, builder);
|
|||
|
|
builder.CloseElement();
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
default:
|
|||
|
|
{
|
|||
|
|
OnRenderListDefault(block[j], builder);
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
builder.CloseElement();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Renders a markdown block which is not covered by the switch-case block in <see cref="RenderList"/>
|
|||
|
|
/// </summary>
|
|||
|
|
protected virtual void OnRenderListDefault(Markdig.Syntax.Block block, RenderTreeBuilder builder)
|
|||
|
|
{
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
protected virtual void RenderDetailsHtml(in RenderTreeBuilder builder, in string header, in string content)
|
|||
|
|
{
|
|||
|
|
var headerHtml = Markdown.Parse(header, Pipeline);
|
|||
|
|
var contentHtml = Markdown.Parse(content);
|
|||
|
|
|
|||
|
|
builder.OpenComponent<MudMarkdownDetails>(ElementIndex++);
|
|||
|
|
builder.AddAttribute(ElementIndex++, nameof(MudMarkdownDetails.TitleContent), (RenderFragment)(titleBuilder => RenderMarkdown(headerHtml, titleBuilder)));
|
|||
|
|
builder.AddAttribute(ElementIndex++, nameof(MudMarkdownDetails.ChildContent), (RenderFragment)(contentBuilder => RenderMarkdown(contentHtml, contentBuilder)));
|
|||
|
|
builder.CloseComponent();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
protected virtual void RenderHtml(in RenderTreeBuilder builder, in StringLineGroup lines)
|
|||
|
|
{
|
|||
|
|
var markupString = new MarkupString(lines.ToString());
|
|||
|
|
builder.AddContent(ElementIndex, markupString);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
private async void NavigationManagerOnLocationChanged(object? sender, LocationChangedEventArgs e)
|
|||
|
|
{
|
|||
|
|
var idFragment = new Uri(e.Location, UriKind.Absolute).Fragment;
|
|||
|
|
if (!idFragment.StartsWith('#') || idFragment.Length < 2)
|
|||
|
|
return;
|
|||
|
|
|
|||
|
|
idFragment = idFragment[1..];
|
|||
|
|
|
|||
|
|
await JsRuntime.InvokeVoidAsync("scrollToElementId", idFragment)
|
|||
|
|
.ConfigureAwait(false);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
private void OnCodeBlockThemeChanged(object? sender, CodeBlockTheme e) =>
|
|||
|
|
CodeBlockTheme = e;
|
|||
|
|
|
|||
|
|
private MarkdownPipeline GetMarkdownPipeLine()
|
|||
|
|
{
|
|||
|
|
if (MarkdownPipeline != null)
|
|||
|
|
return MarkdownPipeline;
|
|||
|
|
|
|||
|
|
return Pipeline ??= new MarkdownPipelineBuilder()
|
|||
|
|
.UseAdvancedExtensions()
|
|||
|
|
.Build();
|
|||
|
|
}
|
|||
|
|
}
|