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898 lines
27 KiB
C#
898 lines
27 KiB
C#
1 month ago
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Web;
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namespace TinyChat.Messages.Formatting;
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/// <summary>
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/// Renders message content as simplified HTML, supporting only specified HTML tags.
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/// Markdown is converted to HTML where supported, otherwise stripped to plain text.
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/// </summary>
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/// <remarks>
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/// Initializes a new instance of the <see cref="SimplifiedHtmlMessageFormatter"/> class.
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/// </remarks>
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/// <param name="supportedTags">Array of supported HTML tag names (e.g., "b", "i", "a", "ul"). Case-insensitive.</param>
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public partial class SimplifiedHtmlMessageFormatter(params string[] supportedTags) : IMessageFormatter
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{
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[GeneratedRegex(@"<([a-z][a-z0-9]*)\b[^>]*>(.*?)</\1>", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Singleline)]
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private static partial Regex HtmlTagsRegex();
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[GeneratedRegex(@"<([a-z][a-z0-9]*)\b[^>]*/>", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex SelfClosingHtmlTagsRegex();
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[GeneratedRegex(@"<!--[\s\S]*?-->", RegexOptions.Compiled)]
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private static partial Regex HtmlCommentsRegex();
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[GeneratedRegex(@"!\[([^\]]*)\]\(([^\)]+)\)", RegexOptions.Compiled)]
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private static partial Regex MarkdownImagesRegex();
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[GeneratedRegex(@"\[([^\]]+)\]\(([^\)]+)\)", RegexOptions.Compiled)]
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private static partial Regex MarkdownLinksRegex();
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[GeneratedRegex(@"^(#{1,6})\s+(.+)$", RegexOptions.Compiled | RegexOptions.Multiline)]
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private static partial Regex MarkdownHeadersRegex();
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[GeneratedRegex(@"(\*\*\*|___)(.*?)\1", RegexOptions.Compiled)]
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private static partial Regex MarkdownBoldItalicRegex();
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[GeneratedRegex(@"(\*\*|__)(.*?)\1", RegexOptions.Compiled)]
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private static partial Regex MarkdownBoldRegex();
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[GeneratedRegex(@"(\*|_)(.*?)\1", RegexOptions.Compiled)]
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private static partial Regex MarkdownItalicRegex();
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[GeneratedRegex(@"~~(.*?)~~", RegexOptions.Compiled)]
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private static partial Regex MarkdownStrikethroughRegex();
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[GeneratedRegex(@"`([^`]*)`", RegexOptions.Compiled)]
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private static partial Regex MarkdownInlineCodeRegex();
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[GeneratedRegex(@"```(?:\w+)?(?:\s*\n)?([\s\S]*?)```", RegexOptions.Compiled)]
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private static partial Regex MarkdownCodeBlockRegex();
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[GeneratedRegex(@"^[-*+]\s+(.+)$", RegexOptions.Compiled | RegexOptions.Multiline)]
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private static partial Regex MarkdownUnorderedListRegex();
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[GeneratedRegex(@"^\d+\.\s+(.+)$", RegexOptions.Compiled | RegexOptions.Multiline)]
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private static partial Regex MarkdownOrderedListRegex();
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[GeneratedRegex(@"^>\s+(.+)$", RegexOptions.Compiled | RegexOptions.Multiline)]
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private static partial Regex MarkdownBlockquoteRegex();
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[GeneratedRegex(@"<ul[^>]*>(.*?)</ul>", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Singleline)]
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private static partial Regex HtmlUnorderedListRegex();
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[GeneratedRegex(@"<ol[^>]*>(.*?)</ol>", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Singleline)]
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private static partial Regex HtmlOrderedListRegex();
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[GeneratedRegex(@"<li[^>]*>(.*?)</li>", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.Singleline)]
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private static partial Regex HtmlListItemRegex();
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[GeneratedRegex(@"<span\s+style=['""]color:\s*([^'""]+)['""]>([^<]+)</span>", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex HtmlColorSpanRegex();
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[GeneratedRegex(@"<span\s+style=['""]background-color:\s*([^'""]+)['""]>([^<]+)</span>", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex HtmlBackColorSpanRegex();
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[GeneratedRegex(@"href=['""]([^'""]+)['""]", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex HrefAttributeRegex();
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[GeneratedRegex(@"src=['""]([^'""]+)['""]", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex SrcAttributeRegex();
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[GeneratedRegex(@"alt=['""]([^'""]*)['""]", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex AltAttributeRegex();
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[GeneratedRegex(@"<font=""([^""]+)"">", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex FontDevExpressFormatRegex();
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[GeneratedRegex(@"face=['""]([^'""]+)['""]", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex FontFaceAttributeRegex();
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[GeneratedRegex(@"<size=([+-]?\d+)>", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex SizeAttributeRegex();
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[GeneratedRegex(@"<color=([^>]+)>", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex ColorAttributeRegex();
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[GeneratedRegex(@"<backcolor=([^>]+)>", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex BackColorAttributeRegex();
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[GeneratedRegex(@"rgba?\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)(?:\s*,\s*(\d+(?:\.\d+)?))?\s*\)", RegexOptions.Compiled | RegexOptions.IgnoreCase)]
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private static partial Regex RgbColorRegex();
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private readonly HashSet<string> _supportedTags = new(supportedTags.Select(NormalizeTag), StringComparer.OrdinalIgnoreCase);
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// Tag mappings from markdown/HTML to canonical HTML tags
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private static readonly Dictionary<string, string> _tagAliases = new(StringComparer.OrdinalIgnoreCase)
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{
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{ "strong", "b" },
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{ "em", "i" },
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{ "del", "s" },
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{ "strike", "s" }
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};
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/// <summary>
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/// Default monospace font family for code blocks and inline code.
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/// </summary>
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public string DefaultCodeFontName { get; set; } = "Consolas";
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/// <summary>
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/// Renders the message content as simplified HTML.
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/// </summary>
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/// <param name="content">The message content to format.</param>
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/// <returns>HTML representation of the content with only supported tags.</returns>
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public string Format(IChatMessageContent content)
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{
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if (content is StringMessageContent stringContent)
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return Format(stringContent.ToString());
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throw new NotSupportedException($"Only {nameof(StringMessageContent)} is supported by {nameof(SimplifiedHtmlMessageFormatter)}.");
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}
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/// <summary>
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/// Renders the message content as simplified HTML.
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/// </summary>
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/// <param name="content">The message content to format.</param>
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/// <returns>HTML representation of the content with only supported tags.</returns>
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public string Format(string content)
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{
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var text = content ?? string.Empty;
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// Step 1: Remove HTML comments
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text = HtmlCommentsRegex().Replace(text, string.Empty);
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// Step 2: Convert color/backcolor span tags to DevExpress format (BEFORE processing HTML tags)
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text = ConvertColorSpansToDevExpressFormat(text);
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// Step 3: Convert supported Markdown to HTML
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text = ConvertMarkdownToHtml(text);
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// Step 4: Process HTML tags (keep supported, strip unsupported)
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text = ProcessHtmlTags(text);
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return text.Trim();
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}
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private string ConvertMarkdownToHtml(string text)
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{
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// Process code blocks first (before other conversions)
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// Code blocks are formatted with font tags and line breaks if font is supported
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text = MarkdownCodeBlockRegex().Replace(text, match =>
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{
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var codeContent = match.Groups[1].Value;
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if (codeContent.EndsWith('\n'))
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codeContent = codeContent[..^1];
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var escapedCode = HttpUtility.HtmlEncode(codeContent);
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// DevExpress doesn't decode " in AllowHtmlString mode, so we need to convert it back
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escapedCode = escapedCode.Replace(""", "\"");
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// Render with font tag if supported, otherwise just plain text
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if (IsSupported("font") && !string.IsNullOrWhiteSpace(DefaultCodeFontName))
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{
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// Don't use HtmlAttributeEncode for font name - DevExpress uses special syntax
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var fontFace = DefaultCodeFontName.Replace("\"", """);
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// Add line breaks before and after code block
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return $"\n<font=\"{fontFace}\">{escapedCode}</font>\n";
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}
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else
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{
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// Fallback to plain text with line breaks
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return $"\n{escapedCode}\n";
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}
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});
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// Process inline code
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// Inline code is formatted with font tags if font is supported
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text = MarkdownInlineCodeRegex().Replace(text, match =>
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{
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var codeContent = match.Groups[1].Value;
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var escapedCode = HttpUtility.HtmlEncode(codeContent);
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// DevExpress doesn't decode " in AllowHtmlString mode, so we need to convert it back
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escapedCode = escapedCode.Replace(""", "\"");
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// Render with font tag if supported, otherwise just plain text
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if (IsSupported("font") && !string.IsNullOrWhiteSpace(DefaultCodeFontName))
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{
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// Don't use HtmlAttributeEncode for font name - DevExpress uses special syntax
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var fontFace = DefaultCodeFontName.Replace("\"", """);
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return $"<font=\"{fontFace}\">{escapedCode}</font>";
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}
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else
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{
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// Fallback to plain text
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return escapedCode;
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}
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});
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// Process images
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if (IsSupported("img"))
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{
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text = MarkdownImagesRegex().Replace(text, match =>
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{
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var alt = HttpUtility.HtmlAttributeEncode(match.Groups[1].Value);
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var src = HttpUtility.HtmlAttributeEncode(match.Groups[2].Value);
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return $"<img src=\"{src}\" alt=\"{alt}\">";
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});
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}
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else
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{
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text = MarkdownImagesRegex().Replace(text, "$1");
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}
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// Process links
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if (IsSupported("a"))
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{
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text = MarkdownLinksRegex().Replace(text, match =>
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{
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var linkText = match.Groups[1].Value;
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// Recursively process formatting in link text
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linkText = ProcessInlineFormatting(linkText);
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var url = HttpUtility.HtmlAttributeEncode(match.Groups[2].Value);
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return $"<a href=\"{url}\">{linkText}</a>";
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});
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}
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else
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{
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text = MarkdownLinksRegex().Replace(text, match =>
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{
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var linkText = match.Groups[1].Value;
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return ProcessInlineFormatting(linkText);
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});
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}
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// Process headers - convert to size+bold instead of h1-h6 tags
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text = MarkdownHeadersRegex().Replace(text, match =>
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{
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var level = match.Groups[1].Value.Length;
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var headerText = match.Groups[2].Value;
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var tag = $"h{level}";
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var processedText = ProcessInlineFormatting(headerText);
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// First check if the h1-h6 tag is supported
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if (IsSupported(tag))
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{
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return $"<{tag}>{processedText}</{tag}>";
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}
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// If h-tag not supported, use size+bold format (DevExpress style)
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var hasBold = IsSupported("b");
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var hasSize = IsSupported("size");
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if (!hasBold && !hasSize)
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return processedText;
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var result = processedText;
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if (hasBold)
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result = $"<b>{result}</b>";
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if (hasSize && level < 6)
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{
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var sizeIncrease = 6 - level; // h1=+5, h2=+4, h3=+3, h4=+2, h5=+1
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result = $"<size=+{sizeIncrease}>{result}</size>";
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}
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return result;
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});
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// Process blockquotes
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if (IsSupported("blockquote"))
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{
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text = MarkdownBlockquoteRegex().Replace(text, match =>
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{
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var quoteText = ProcessInlineFormatting(match.Groups[1].Value);
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return $"<blockquote>{quoteText}</blockquote>";
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});
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}
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// Process lists BEFORE inline formatting to preserve markers
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if (IsSupported("ul") && IsSupported("li"))
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{
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text = ConvertUnorderedLists(text);
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}
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if (IsSupported("ol") && IsSupported("li"))
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{
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text = ConvertOrderedLists(text);
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}
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// Process inline formatting (bold, italic, strikethrough) AFTER lists
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text = ProcessInlineFormatting(text);
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return text;
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}
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private string ProcessInlineFormatting(string text)
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{
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// Process bold+italic (***) first to handle triple asterisks correctly
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if (IsSupported("b") && IsSupported("i"))
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{
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text = MarkdownBoldItalicRegex().Replace(text, "<b><i>$2</i></b>");
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}
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else if (IsSupported("b"))
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{
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// If only bold is supported, treat *** as bold
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text = MarkdownBoldItalicRegex().Replace(text, "<b>$2</b>");
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}
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else if (IsSupported("i"))
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{
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// If only italic is supported, treat *** as italic
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text = MarkdownBoldItalicRegex().Replace(text, "<i>$2</i>");
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}
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else
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{
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// Neither supported, strip
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text = MarkdownBoldItalicRegex().Replace(text, "$2");
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}
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// Process bold (before italic to handle *** correctly)
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if (IsSupported("b"))
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{
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text = MarkdownBoldRegex().Replace(text, match =>
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{
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var content = match.Groups[2].Value;
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// Recursively process inner content
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content = ProcessInlineFormattingWithoutBold(content);
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return $"<b>{content}</b>";
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});
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}
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else
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{
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text = MarkdownBoldRegex().Replace(text, match =>
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{
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var content = match.Groups[2].Value;
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return ProcessInlineFormattingWithoutBold(content);
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});
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}
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// Process italic
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if (IsSupported("i"))
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{
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text = MarkdownItalicRegex().Replace(text, "<i>$2</i>");
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}
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else
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{
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text = MarkdownItalicRegex().Replace(text, "$2");
|
||
|
|
}
|
||
|
|
|
||
|
|
// Process strikethrough
|
||
|
|
if (IsSupported("s"))
|
||
|
|
{
|
||
|
|
text = MarkdownStrikethroughRegex().Replace(text, "<s>$1</s>");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
text = MarkdownStrikethroughRegex().Replace(text, "$1");
|
||
|
|
}
|
||
|
|
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
private string ProcessInlineFormattingWithoutBold(string text)
|
||
|
|
{
|
||
|
|
// Process italic
|
||
|
|
if (IsSupported("i"))
|
||
|
|
{
|
||
|
|
text = MarkdownItalicRegex().Replace(text, "<i>$2</i>");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
text = MarkdownItalicRegex().Replace(text, "$2");
|
||
|
|
}
|
||
|
|
|
||
|
|
// Process strikethrough
|
||
|
|
if (IsSupported("s"))
|
||
|
|
{
|
||
|
|
text = MarkdownStrikethroughRegex().Replace(text, "<s>$1</s>");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
text = MarkdownStrikethroughRegex().Replace(text, "$1");
|
||
|
|
}
|
||
|
|
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
private string ConvertUnorderedLists(string text)
|
||
|
|
{
|
||
|
|
var lines = text.Split('\n');
|
||
|
|
var result = new StringBuilder();
|
||
|
|
var inList = false;
|
||
|
|
|
||
|
|
for (var i = 0; i < lines.Length; i++)
|
||
|
|
{
|
||
|
|
var line = lines[i];
|
||
|
|
var match = MarkdownUnorderedListRegex().Match(line);
|
||
|
|
|
||
|
|
if (match.Success)
|
||
|
|
{
|
||
|
|
if (!inList)
|
||
|
|
{
|
||
|
|
result.Append("<ul>");
|
||
|
|
inList = true;
|
||
|
|
}
|
||
|
|
var itemText = match.Groups[1].Value;
|
||
|
|
// Process inline formatting in list items
|
||
|
|
itemText = ProcessInlineFormatting(itemText);
|
||
|
|
result.Append($"<li>{itemText}</li>");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (inList)
|
||
|
|
{
|
||
|
|
result.Append("</ul>\n");
|
||
|
|
inList = false;
|
||
|
|
}
|
||
|
|
result.Append(line);
|
||
|
|
|
||
|
|
// Add newline if not last line
|
||
|
|
if (i < lines.Length - 1)
|
||
|
|
result.Append('\n');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (inList)
|
||
|
|
result.Append("</ul>");
|
||
|
|
|
||
|
|
return result.ToString();
|
||
|
|
}
|
||
|
|
|
||
|
|
private string ConvertOrderedLists(string text)
|
||
|
|
{
|
||
|
|
var lines = text.Split('\n');
|
||
|
|
var result = new StringBuilder();
|
||
|
|
var inList = false;
|
||
|
|
|
||
|
|
for (var i = 0; i < lines.Length; i++)
|
||
|
|
{
|
||
|
|
var line = lines[i];
|
||
|
|
var match = MarkdownOrderedListRegex().Match(line);
|
||
|
|
|
||
|
|
if (match.Success)
|
||
|
|
{
|
||
|
|
if (!inList)
|
||
|
|
{
|
||
|
|
result.Append("<ol>");
|
||
|
|
inList = true;
|
||
|
|
}
|
||
|
|
var itemText = match.Groups[1].Value;
|
||
|
|
// Process inline formatting in list items
|
||
|
|
itemText = ProcessInlineFormatting(itemText);
|
||
|
|
result.Append($"<li>{itemText}</li>");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (inList)
|
||
|
|
{
|
||
|
|
result.Append("</ol>\n");
|
||
|
|
inList = false;
|
||
|
|
}
|
||
|
|
result.Append(line);
|
||
|
|
|
||
|
|
// Add newline if not last line
|
||
|
|
if (i < lines.Length - 1)
|
||
|
|
result.Append('\n');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (inList)
|
||
|
|
result.Append("</ol>");
|
||
|
|
|
||
|
|
return result.ToString();
|
||
|
|
}
|
||
|
|
|
||
|
|
private string ProcessHtmlTags(string text)
|
||
|
|
{
|
||
|
|
// Convert HTML lists to plain text BEFORE processing other tags
|
||
|
|
text = ConvertHtmlListsIfNotSupported(text);
|
||
|
|
|
||
|
|
bool changed;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
changed = false;
|
||
|
|
var originalText = text;
|
||
|
|
|
||
|
|
// Process regular paired tags
|
||
|
|
text = HtmlTagsRegex().Replace(text, match =>
|
||
|
|
{
|
||
|
|
var tagName = match.Groups[1].Value;
|
||
|
|
var content = match.Groups[2].Value;
|
||
|
|
var normalizedTag = NormalizeTag(tagName);
|
||
|
|
|
||
|
|
// Always recursively process content first to handle nested tags
|
||
|
|
var processedContent = ProcessHtmlTagsInner(content);
|
||
|
|
|
||
|
|
// Handle special conversions for HTML tags
|
||
|
|
|
||
|
|
// Convert <code> and <pre> to <font> if font is supported but code/pre are not
|
||
|
|
if ((normalizedTag == "code" || normalizedTag == "pre") && !IsSupported(normalizedTag) && IsSupported("font") && !string.IsNullOrWhiteSpace(DefaultCodeFontName))
|
||
|
|
{
|
||
|
|
// Don't use HtmlAttributeEncode for font name - DevExpress uses special syntax
|
||
|
|
var fontFace = DefaultCodeFontName.Replace("\"", """);
|
||
|
|
// Don't double-encode - content is already processed
|
||
|
|
return $"<font=\"{fontFace}\">{processedContent}</font>";
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert h1-h6 tags to size+bold if h-tags not supported but size/b are
|
||
|
|
if (normalizedTag.Length == 2 && normalizedTag[0] == 'h' && char.IsDigit(normalizedTag[1]))
|
||
|
|
{
|
||
|
|
var level = int.Parse(normalizedTag[1].ToString());
|
||
|
|
|
||
|
|
if (!IsSupported(normalizedTag))
|
||
|
|
{
|
||
|
|
// If h-tag not supported, use size+bold format (DevExpress style)
|
||
|
|
var hasBold = IsSupported("b");
|
||
|
|
var hasSize = IsSupported("size");
|
||
|
|
|
||
|
|
if (!hasBold && !hasSize)
|
||
|
|
return processedContent;
|
||
|
|
|
||
|
|
var result = processedContent;
|
||
|
|
|
||
|
|
if (hasBold)
|
||
|
|
result = $"<b>{result}</b>";
|
||
|
|
|
||
|
|
if (hasSize && level < 6)
|
||
|
|
{
|
||
|
|
var sizeIncrease = 6 - level; // h1=+5, h2=+4, h3=+3, h4=+2, h5=+1
|
||
|
|
result = $"<size=+{sizeIncrease}>{result}</size>";
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (IsSupported(normalizedTag))
|
||
|
|
{
|
||
|
|
// For specific tags, keep only essential attributes
|
||
|
|
var attributes = "";
|
||
|
|
|
||
|
|
if (normalizedTag == "a")
|
||
|
|
{
|
||
|
|
// Extract href attribute only
|
||
|
|
var hrefMatch = HrefAttributeRegex().Match(match.Value);
|
||
|
|
if (hrefMatch.Success)
|
||
|
|
attributes = $" href=\"{hrefMatch.Groups[1].Value}\"";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "img")
|
||
|
|
{
|
||
|
|
// Extract src and alt attributes only
|
||
|
|
var srcMatch = SrcAttributeRegex().Match(match.Value);
|
||
|
|
var altMatch = AltAttributeRegex().Match(match.Value);
|
||
|
|
|
||
|
|
if (srcMatch.Success)
|
||
|
|
attributes += $" src=\"{srcMatch.Groups[1].Value}\"";
|
||
|
|
if (altMatch.Success)
|
||
|
|
attributes += $" alt=\"{altMatch.Groups[1].Value}\"";
|
||
|
|
|
||
|
|
attributes = attributes.Trim();
|
||
|
|
if (attributes.Length > 0)
|
||
|
|
attributes = " " + attributes;
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "font")
|
||
|
|
{
|
||
|
|
// DevExpress uses <font="FontName"> syntax instead of <font face="FontName">
|
||
|
|
// Extract both face attribute and the simplified DevExpress format
|
||
|
|
var devExpressMatch = FontDevExpressFormatRegex().Match(match.Value);
|
||
|
|
var faceMatch = FontFaceAttributeRegex().Match(match.Value);
|
||
|
|
|
||
|
|
if (devExpressMatch.Success)
|
||
|
|
attributes = $"=\"{devExpressMatch.Groups[1].Value}\"";
|
||
|
|
else if (faceMatch.Success)
|
||
|
|
attributes = $"=\"{faceMatch.Groups[1].Value}\"";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "size")
|
||
|
|
{
|
||
|
|
// Extract size value (e.g., <size=+3>)
|
||
|
|
var sizeMatch = SizeAttributeRegex().Match(match.Value);
|
||
|
|
if (sizeMatch.Success)
|
||
|
|
attributes = $"={sizeMatch.Groups[1].Value}";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "color")
|
||
|
|
{
|
||
|
|
// Extract color value (e.g., <color=red> or <color=#FF0000>)
|
||
|
|
var colorMatch = ColorAttributeRegex().Match(match.Value);
|
||
|
|
if (colorMatch.Success)
|
||
|
|
attributes = $"={colorMatch.Groups[1].Value}";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "backcolor")
|
||
|
|
{
|
||
|
|
// Extract backcolor value
|
||
|
|
var backcolorMatch = BackColorAttributeRegex().Match(match.Value);
|
||
|
|
if (backcolorMatch.Success)
|
||
|
|
attributes = $"={backcolorMatch.Groups[1].Value}";
|
||
|
|
}
|
||
|
|
|
||
|
|
if (normalizedTag == "size" || normalizedTag == "color" || normalizedTag == "backcolor")
|
||
|
|
{
|
||
|
|
return $"<{normalizedTag}{attributes}>{processedContent}</{normalizedTag}>";
|
||
|
|
}
|
||
|
|
|
||
|
|
return $"<{normalizedTag}{attributes}>{processedContent}</{normalizedTag}>";
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Strip tag but keep processed content
|
||
|
|
return processedContent;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
// Process self-closing tags
|
||
|
|
text = SelfClosingHtmlTagsRegex().Replace(text, match =>
|
||
|
|
{
|
||
|
|
var tagName = match.Groups[1].Value;
|
||
|
|
var normalizedTag = NormalizeTag(tagName);
|
||
|
|
|
||
|
|
if (IsSupported(normalizedTag))
|
||
|
|
{
|
||
|
|
return match.Value; // Keep the tag as-is with attributes for self-closing tags like <br/>
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return string.Empty; // Remove unsupported self-closing tags
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
if (text != originalText)
|
||
|
|
changed = true;
|
||
|
|
|
||
|
|
} while (changed);
|
||
|
|
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
private string ConvertHtmlListsIfNotSupported(string text)
|
||
|
|
{
|
||
|
|
// We need to process nested lists from innermost to outermost
|
||
|
|
// So we keep replacing until no more <ul> or <ol> tags are found
|
||
|
|
var changed = true;
|
||
|
|
while (changed)
|
||
|
|
{
|
||
|
|
var originalText = text;
|
||
|
|
|
||
|
|
// Convert unordered lists <ul> to "- " prefixed items if ul/li not supported
|
||
|
|
if (!IsSupported("ul") || !IsSupported("li"))
|
||
|
|
{
|
||
|
|
text = HtmlUnorderedListRegex().Replace(text, match =>
|
||
|
|
{
|
||
|
|
var listContent = match.Groups[1].Value;
|
||
|
|
var items = HtmlListItemRegex().Matches(listContent);
|
||
|
|
// Strip HTML tags from list items when converting to plain text
|
||
|
|
var result = string.Join("\n", items.Cast<Match>().Select(m => $"- {StripHtmlTags(m.Groups[1].Value.Trim())}"));
|
||
|
|
return result;
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert ordered lists <ol> to numbered items if ol/li not supported
|
||
|
|
if (!IsSupported("ol") || !IsSupported("li"))
|
||
|
|
{
|
||
|
|
text = HtmlOrderedListRegex().Replace(text, match =>
|
||
|
|
{
|
||
|
|
var listContent = match.Groups[1].Value;
|
||
|
|
var items = HtmlListItemRegex().Matches(listContent);
|
||
|
|
// Strip HTML tags from list items when converting to plain text
|
||
|
|
var result = string.Join("\n", items.Cast<Match>().Select((m, i) => $"{i + 1}. {StripHtmlTags(m.Groups[1].Value.Trim())}"));
|
||
|
|
return result;
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
changed = text != originalText;
|
||
|
|
}
|
||
|
|
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static string StripHtmlTags(string text)
|
||
|
|
{
|
||
|
|
// Recursively strip all HTML tags but keep content
|
||
|
|
var changed = true;
|
||
|
|
while (changed)
|
||
|
|
{
|
||
|
|
var originalText = text;
|
||
|
|
|
||
|
|
// Replace tags with their content
|
||
|
|
text = HtmlTagsRegex().Replace(text, "$2");
|
||
|
|
|
||
|
|
// Remove self-closing tags
|
||
|
|
text = SelfClosingHtmlTagsRegex().Replace(text, string.Empty);
|
||
|
|
|
||
|
|
changed = text != originalText;
|
||
|
|
}
|
||
|
|
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
private string ConvertColorSpansToDevExpressFormat(string text)
|
||
|
|
{
|
||
|
|
// Convert HTML <span style="color:xxx"> to DevExpress <color=xxx>
|
||
|
|
if (IsSupported("color"))
|
||
|
|
{
|
||
|
|
text = HtmlColorSpanRegex().Replace(text, match =>
|
||
|
|
{
|
||
|
|
var color = ParseColorValue(match.Groups[1].Value);
|
||
|
|
var content = match.Groups[2].Value;
|
||
|
|
return $"<color={color}>{content}</color>";
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert HTML <span style="background-color:xxx"> to DevExpress <backcolor=xxx>
|
||
|
|
if (IsSupported("backcolor"))
|
||
|
|
{
|
||
|
|
text = HtmlBackColorSpanRegex().Replace(text, match =>
|
||
|
|
{
|
||
|
|
var color = ParseColorValue(match.Groups[1].Value);
|
||
|
|
var content = match.Groups[2].Value;
|
||
|
|
return $"<backcolor={color}>{content}</backcolor>";
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static string ParseColorValue(string colorValue)
|
||
|
|
{
|
||
|
|
// Normalize color value - keep as is (named colors, hex, rgb)
|
||
|
|
// DevExpress supports: red, #FF0000, 255,0,0, 255,255,0,0 (ARGB)
|
||
|
|
colorValue = colorValue.Trim();
|
||
|
|
|
||
|
|
// If it's rgb() or rgba() format, extract values
|
||
|
|
var rgbMatch = RgbColorRegex().Match(colorValue);
|
||
|
|
if (rgbMatch.Success)
|
||
|
|
{
|
||
|
|
var r = rgbMatch.Groups[1].Value;
|
||
|
|
var g = rgbMatch.Groups[2].Value;
|
||
|
|
var b = rgbMatch.Groups[3].Value;
|
||
|
|
var a = rgbMatch.Groups[4].Success ? rgbMatch.Groups[4].Value : null;
|
||
|
|
|
||
|
|
if (a != null)
|
||
|
|
{
|
||
|
|
// Convert alpha from 0-1 or 0-255 to 0-255
|
||
|
|
var alphaValue = double.Parse(a);
|
||
|
|
if (alphaValue <= 1.0)
|
||
|
|
alphaValue *= 255;
|
||
|
|
return $"{(int)alphaValue},{r},{g},{b}";
|
||
|
|
}
|
||
|
|
|
||
|
|
return $"{r},{g},{b}";
|
||
|
|
}
|
||
|
|
|
||
|
|
return colorValue;
|
||
|
|
}
|
||
|
|
|
||
|
|
private string ProcessHtmlTagsInner(string content)
|
||
|
|
{
|
||
|
|
// Single pass recursive processing for nested tags
|
||
|
|
var processed = HtmlTagsRegex().Replace(content, match =>
|
||
|
|
{
|
||
|
|
var tagName = match.Groups[1].Value;
|
||
|
|
var innerContent = match.Groups[2].Value;
|
||
|
|
var normalizedTag = NormalizeTag(tagName);
|
||
|
|
|
||
|
|
// Recursively process inner content
|
||
|
|
var processedInner = ProcessHtmlTagsInner(innerContent);
|
||
|
|
|
||
|
|
// Handle special conversions for HTML tags (same as in ProcessHtmlTags)
|
||
|
|
|
||
|
|
// Convert <code> and <pre> to <font> if font is supported but code/pre are not
|
||
|
|
if ((normalizedTag == "code" || normalizedTag == "pre") && !IsSupported(normalizedTag) && IsSupported("font") && !string.IsNullOrWhiteSpace(DefaultCodeFontName))
|
||
|
|
{
|
||
|
|
// Don't use HtmlAttributeEncode for font name - DevExpress uses special syntax
|
||
|
|
var fontFace = DefaultCodeFontName.Replace("\"", """);
|
||
|
|
return $"<font=\"{fontFace}\">{processedInner}</font>";
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert h1-h6 tags to size+bold if h-tags not supported but size/b are
|
||
|
|
if (normalizedTag.Length == 2 && normalizedTag[0] == 'h' && char.IsDigit(normalizedTag[1]))
|
||
|
|
{
|
||
|
|
var level = int.Parse(normalizedTag[1].ToString());
|
||
|
|
|
||
|
|
if (!IsSupported(normalizedTag))
|
||
|
|
{
|
||
|
|
// If h-tag not supported, use size+bold format (DevExpress style)
|
||
|
|
var hasBold = IsSupported("b");
|
||
|
|
var hasSize = IsSupported("size");
|
||
|
|
|
||
|
|
if (!hasBold && !hasSize)
|
||
|
|
return processedInner;
|
||
|
|
|
||
|
|
var result = processedInner;
|
||
|
|
|
||
|
|
if (hasBold)
|
||
|
|
result = $"<b>{result}</b>";
|
||
|
|
|
||
|
|
if (hasSize && level < 6)
|
||
|
|
{
|
||
|
|
var sizeIncrease = 6 - level; // h1=+5, h2=+4, h3=+3, h4=+2, h5=+1
|
||
|
|
result = $"<size=+{sizeIncrease}>{result}</size>";
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (IsSupported(normalizedTag))
|
||
|
|
{
|
||
|
|
// For nested tags, extract and keep essential attributes
|
||
|
|
var attributes = "";
|
||
|
|
|
||
|
|
if (normalizedTag == "a")
|
||
|
|
{
|
||
|
|
var hrefMatch = HrefAttributeRegex().Match(match.Value);
|
||
|
|
if (hrefMatch.Success)
|
||
|
|
attributes = $" href=\"{hrefMatch.Groups[1].Value}\"";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "img")
|
||
|
|
{
|
||
|
|
var srcMatch = SrcAttributeRegex().Match(match.Value);
|
||
|
|
var altMatch = AltAttributeRegex().Match(match.Value);
|
||
|
|
|
||
|
|
if (srcMatch.Success)
|
||
|
|
attributes += $" src=\"{srcMatch.Groups[1].Value}\"";
|
||
|
|
if (altMatch.Success)
|
||
|
|
attributes += $" alt=\"{altMatch.Groups[1].Value}\"";
|
||
|
|
|
||
|
|
attributes = attributes.Trim();
|
||
|
|
if (attributes.Length > 0)
|
||
|
|
attributes = " " + attributes;
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "font")
|
||
|
|
{
|
||
|
|
var devExpressMatch = FontDevExpressFormatRegex().Match(match.Value);
|
||
|
|
var faceMatch = FontFaceAttributeRegex().Match(match.Value);
|
||
|
|
|
||
|
|
if (devExpressMatch.Success)
|
||
|
|
attributes = $"=\"{devExpressMatch.Groups[1].Value}\"";
|
||
|
|
else if (faceMatch.Success)
|
||
|
|
attributes = $"=\"{faceMatch.Groups[1].Value}\"";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "size")
|
||
|
|
{
|
||
|
|
var sizeMatch = SizeAttributeRegex().Match(match.Value);
|
||
|
|
if (sizeMatch.Success)
|
||
|
|
attributes = $"={sizeMatch.Groups[1].Value}";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "color")
|
||
|
|
{
|
||
|
|
var colorMatch = ColorAttributeRegex().Match(match.Value);
|
||
|
|
if (colorMatch.Success)
|
||
|
|
attributes = $"={colorMatch.Groups[1].Value}";
|
||
|
|
}
|
||
|
|
else if (normalizedTag == "backcolor")
|
||
|
|
{
|
||
|
|
var backcolorMatch = BackColorAttributeRegex().Match(match.Value);
|
||
|
|
if (backcolorMatch.Success)
|
||
|
|
attributes = $"={backcolorMatch.Groups[1].Value}";
|
||
|
|
}
|
||
|
|
|
||
|
|
if (normalizedTag == "size" || normalizedTag == "color" || normalizedTag == "backcolor")
|
||
|
|
{
|
||
|
|
return $"<{normalizedTag}{attributes}>{processedInner}</{normalizedTag}>";
|
||
|
|
}
|
||
|
|
|
||
|
|
return $"<{normalizedTag}{attributes}>{processedInner}</{normalizedTag}>";
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Strip tag but keep content
|
||
|
|
return processedInner;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
return processed;
|
||
|
|
}
|
||
|
|
|
||
|
|
private bool IsSupported(string tag)
|
||
|
|
{
|
||
|
|
return _supportedTags.Contains(NormalizeTag(tag));
|
||
|
|
}
|
||
|
|
|
||
|
|
private static string NormalizeTag(string tag)
|
||
|
|
{
|
||
|
|
if (_tagAliases.TryGetValue(tag, out var normalized))
|
||
|
|
return normalized;
|
||
|
|
return tag.ToLowerInvariant();
|
||
|
|
}
|
||
|
|
}
|