104 lines
2.9 KiB
C#
104 lines
2.9 KiB
C#
using Markdig.Helpers;
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using Markdig.Parsers;
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using Markdig.Syntax.Inlines;
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namespace MfGames.Markdown.Extensions;
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public class WikiLinkInlineParser : InlineParser
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{
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private readonly WikiLinkOptions options;
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public WikiLinkInlineParser(WikiLinkOptions options)
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{
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this.options = options;
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this.OpeningCharacters = new[] { '[' };
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}
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/// <inheritdoc />
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public override bool Match(InlineProcessor processor, ref StringSlice slice)
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{
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// We are looking for the `[[` opening for the tag and that the first
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// one isn't escaped.
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if (IsNotDelimiter(slice, '['))
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{
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return false;
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}
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// We need to loop over the entire link, including the `[[` and `]]`
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// while keeping track since we'll swallow additional characters beyond
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// the link.
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int linkStart = slice.Start;
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int linkEnd = slice.Start;
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slice.Start += 2;
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// Our content starts after the double '[['.
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int contentStart = slice.Start;
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// We need to find the end of the link (the `]]`).
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while (IsNotDelimiter(slice, ']'))
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{
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slice.NextChar();
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linkEnd = slice.Start;
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}
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// Pull out the components before we adjust for the ']]' for the end.
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int contentEnd = linkEnd;
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// Finish skipping over the `]]`.
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slice.NextChar();
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slice.NextChar();
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// Format the label and the URL.
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string content = slice.Text.Substring(contentStart, contentEnd - contentStart);
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string[] contentParts = content.Split('|', 2);
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string label = contentParts.Last();
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string url = this.options.GetUrl(contentParts.First());
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// Add in any trailing components. This merges the `'s` from
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// `[[Dale]]'s` into the label.
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while (this.options.IsTrailingLink(slice.CurrentChar))
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{
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label += slice.CurrentChar;
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slice.NextChar();
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linkEnd++;
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}
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// Create the link that we're replacing.
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WikiLink link =
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new()
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{
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Span =
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{
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Start = processor.GetSourcePosition(linkStart, out int line, out int column),
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},
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Line = line,
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Column = column,
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Url = url,
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IsClosed = true,
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};
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link.AppendChild(
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new LiteralInline()
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{
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Line = line,
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Column = column,
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Content = new StringSlice(label),
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IsClosed = true,
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}
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);
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// Replace the inline and then indicate we have a match.
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processor.Inline = link;
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return true;
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}
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private static bool IsNotDelimiter(StringSlice slice, char delimiter)
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{
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return slice.CurrentChar != delimiter
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|| slice.PeekChar() != delimiter
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|| slice.PeekCharExtra(-1) == '\\';
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}
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}
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