114 lines
No EOL
2.2 KiB
C#
114 lines
No EOL
2.2 KiB
C#
using AngleSharp.Dom;
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using AngleSharp.Html.Dom;
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using Iceshrimp.Backend.Core.Database.Tables;
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namespace Iceshrimp.Backend.Core.Helpers.LibMfm.Parsing;
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internal class HtmlParser(IEnumerable<Note.MentionedUser> mentions)
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{
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internal string? ParseNode(INode node)
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{
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if (node.NodeType is NodeType.Text)
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return node.TextContent;
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if (node.NodeType is NodeType.Comment or NodeType.Document)
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return null;
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switch (node.NodeName)
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{
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case "BR":
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{
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return "\n";
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}
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case "A":
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{
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if (node is HtmlElement el)
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{
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var href = el.GetAttribute("href");
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if (href == null) return $"<plain>{el.TextContent}</plain>";
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if (el.ClassList.Contains("u-url") && el.ClassList.Contains("mention"))
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{
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var mention = mentions.FirstOrDefault(p => p.Uri == href || p.Url == href);
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return mention != null
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? $"@{mention.Username}@{mention.Host}"
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: $"<plain>{el.TextContent}</plain>";
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}
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return $"[{el.TextContent}]({href})";
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}
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return node.TextContent;
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}
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case "H1":
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{
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return $"【{ParseChildren(node)}】\n";
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}
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case "B":
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case "STRONG":
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{
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return $"**{ParseChildren(node)}**";
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}
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case "SMALL":
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{
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return $"<small>{ParseChildren(node)}</small>";
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}
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case "S":
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case "DEL":
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{
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return $"~~{ParseChildren(node)}~~";
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}
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case "I":
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case "EM":
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{
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return $"*{ParseChildren(node)}*";
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}
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case "PRE":
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{
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return node.ChildNodes is [{ NodeName: "CODE" }]
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? $"\n```\n{string.Join(null, node.ChildNodes[0].TextContent)}\n```\n"
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: ParseChildren(node);
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}
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case "CODE":
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{
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return $"`{ParseChildren(node)}`";
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}
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case "BLOCKQUOTE":
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{
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return node.TextContent.Length > 0
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? $"\n> {string.Join("\n> ", node.TextContent.Split("\n"))}"
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: null;
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}
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case "P":
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case "H2":
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case "H3":
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case "H4":
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case "H5":
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case "H6":
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{
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return $"\n\n{ParseChildren(node)}";
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}
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case "DIV":
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case "HEADER":
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case "FOOTER":
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case "ARTICLE":
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case "LI":
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case "DT":
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case "DD":
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{
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return $"\n{ParseChildren(node)}";
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}
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default:
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{
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return ParseChildren(node);
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}
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}
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}
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private string ParseChildren(INode node)
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{
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return string.Join(null, node.ChildNodes.Select(ParseNode));
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}
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} |