85 lines
2.6 KiB
C#
85 lines
2.6 KiB
C#
using ProSol.Html.Contracts.Data;
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using ProSol.Html.Contracts.Operations;
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using ProSol.Html.Data;
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using ProSol.Html.Messaging;
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namespace ProSol.Html;
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/// <summary>
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/// Processes the html input, provides push-notifications when html tag met for <see cref="IObserver<TagsProviderMessage"/>.
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/// </summary>
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/// <remarks>
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/// Push-notification happens only when the closing tag met, so it contains the full data on tag.
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/// </remarks>
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public class TagsProvider : IFilteredObservable<TagsProviderMessage>
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{
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readonly HistoryTracker historyTracker = new();
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readonly Broadcaster broadcaster = new();
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public void Process(ReadOnlySpan<char> html)
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{
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var charsProcessed = TagsNavigator.GetNextTagIndex(html);
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do
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{
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var currentHtml = html[charsProcessed..];
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Process(currentHtml, charsProcessed);
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historyTracker.Update(currentHtml, charsProcessed);
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charsProcessed += Proceed(currentHtml);
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} while (charsProcessed < html.Length);
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broadcaster.OnCompleted();
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}
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public IDisposable Subscribe(IObserver<TagsProviderMessage> observer)
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=> broadcaster.Subscribe(observer);
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public IDisposable Subscribe(IObserver<TagsProviderMessage> observer, params string[] tagNames)
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=> broadcaster.Subscribe(observer, tagNames);
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void Process(ReadOnlySpan<char> currentHtml, int charsProcessed)
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{
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if (TagDetector.Detect(currentHtml) != TagKind.Closing)
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{
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return;
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}
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var latestTag = historyTracker.History.LastOrDefault();
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if (latestTag == null)
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{
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// TODO: log a warning here!
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return;
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}
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var tag = currentHtml.Clip("<", ">");
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var tagLength = charsProcessed + tag.Length;
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var range = latestTag.TagOffset..tagLength;
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var innerRange = latestTag.InnerOffset switch
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{
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null => 0..0,
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var o => o.Value..charsProcessed
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};
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var processedTag = new ProcessedTag(latestTag.TagInfo, range, innerRange);
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OnProcessedTagMet(processedTag);
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}
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void OnProcessedTagMet(ProcessedTag value)
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{
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var history = historyTracker
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.History
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.Select(x => x.TagInfo);
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var message = new TagsProviderMessage(
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[..history],
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value);
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broadcaster.OnNext(message, value.TagInfo.Name);
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}
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static int Proceed(ReadOnlySpan<char> currentHtml)
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=> TagDetector.Detect(currentHtml) switch
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{
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TagKind.Comment => TagsNavigator.SkipComment(currentHtml),
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_ => 1 + TagsNavigator.GetNextTagIndex(currentHtml[1..])
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};
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}
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