96 lines
2.4 KiB
C#
96 lines
2.4 KiB
C#
using Markdig.Helpers;
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using Markdig.Parsers;
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namespace OliverBooth.Markdown.Timestamp;
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/// <summary>
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/// Represents a Markdown inline parser that matches Discord-style timestamps.
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/// </summary>
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public sealed class TimestampInlineParser : InlineParser
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="TimestampInlineParser" /> class.
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/// </summary>
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public TimestampInlineParser()
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{
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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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// Previous char must be a space
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if (!slice.PeekCharExtra(-1).IsWhiteSpaceOrZero())
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{
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return false;
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}
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ReadOnlySpan<char> span = slice.Text.AsSpan(slice.Start, slice.Length);
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if (!TryConsumeTimestamp(span, out ReadOnlySpan<char> rawTimestamp, out char format))
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{
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return false;
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}
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if (!long.TryParse(rawTimestamp, out long timestamp))
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{
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return false;
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}
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bool hasFormat = format != '\0';
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processor.Inline = new TimestampInline
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{
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Format = (TimestampFormat)format,
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Timestamp = DateTimeOffset.FromUnixTimeSeconds(timestamp)
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};
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int paddingCount = hasFormat ? 6 : 4; // <t:*> or optionally <t:*:*>
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slice.Start += rawTimestamp.Length + paddingCount;
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return true;
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}
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private bool TryConsumeTimestamp(ReadOnlySpan<char> source,
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out ReadOnlySpan<char> timestamp,
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out char format)
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{
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timestamp = default;
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format = default;
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if (!source.StartsWith("<t:"))
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{
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return false;
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}
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timestamp = source[3..];
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if (timestamp.IndexOf('>') == -1)
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{
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timestamp = default;
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return false;
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}
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int delimiterIndex = timestamp.IndexOf(':');
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if (delimiterIndex == 0)
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{
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// invalid format <t::*>
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timestamp = default;
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return false;
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}
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if (delimiterIndex == -1)
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{
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// no format, default to relative
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format = 'R';
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timestamp = timestamp[..^1]; // trim >
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}
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else
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{
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// use specified format
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format = timestamp[^2];
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timestamp = timestamp[..^3];
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}
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return true;
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}
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}
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