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Move markdown parsing logic outside control thread #2099

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merged 3 commits into from
Apr 15, 2020
Merged

Move markdown parsing logic outside control thread #2099

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962e60e
Move markdown parsing logic outside control thread
veleek Apr 12, 2020
14a371a
Update MarkdownPreviewHandlerControl.cs
veleek Apr 13, 2020
6601554
Remove trailing whitespace.
veleek Apr 15, 2020
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64 changes: 34 additions & 30 deletions src/modules/previewpane/MarkdownPreviewHandler/MarkdownPreviewHandlerControl.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,8 @@
// See the LICENSE file in the project root for more information.

using System;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using Common;
Expand Down Expand Up @@ -73,28 +70,29 @@ public MarkdownPreviewHandlerControl()
/// <param name="dataSource">Path to the file.</param>
public override void DoPreview<T>(T dataSource)
{
this.InvokeOnControlThread(() =>
if (!(dataSource is string filePath))
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{
try
{
this.infoBarDisplayed = false;
throw new ArgumentException($"{nameof(dataSource)} for {nameof(MarkdownPreviewHandler)} must be a string but was a '{typeof(T)}'");
}

StringBuilder sb = new StringBuilder();
string filePath = dataSource as string;
string fileText = File.ReadAllText(filePath);
this.extension.BaseUrl = Path.GetDirectoryName(filePath);
this.infoBarDisplayed = false;

Regex rgx = new Regex(@"<[ ]*img.*>");
if (rgx.IsMatch(fileText))
{
this.infoBarDisplayed = true;
}
try
{
string fileText = File.ReadAllText(filePath);
Regex imageTagRegex = new Regex(@"<[ ]*img.*>");
if (imageTagRegex.IsMatch(fileText))
{
this.infoBarDisplayed = true;
}

MarkdownPipeline pipeline = this.pipelineBuilder.Build();
string parsedMarkdown = Markdown.ToHtml(fileText, pipeline);
sb.AppendFormat("{0}{1}{2}", this.htmlHeader, parsedMarkdown, this.htmlFooter);
string markdownHTML = sb.ToString();
this.extension.BaseUrl = Path.GetDirectoryName(filePath);
MarkdownPipeline pipeline = this.pipelineBuilder.Build();
string parsedMarkdown = Markdown.ToHtml(fileText, pipeline);
string markdownHTML = $"{this.htmlHeader}{parsedMarkdown}{this.htmlFooter}";

this.InvokeOnControlThread(() =>
{
this.browser = new WebBrowserExt
{
DocumentText = markdownHTML,
Expand All @@ -109,24 +107,30 @@ public override void DoPreview<T>(T dataSource)
if (this.infoBarDisplayed)
{
this.infoBar = this.GetTextBoxControl(Resources.BlockedImageInfoText);
this.Resize += this.FormResized;
this.Controls.Add(this.infoBar);
}
});

this.Resize += this.FormResized;
base.DoPreview(dataSource);
MarkdownTelemetry.Log.MarkdownFilePreviewed();
}
catch (Exception e)
MarkdownTelemetry.Log.MarkdownFilePreviewed();
}
catch (Exception e)
{
MarkdownTelemetry.Log.MarkdownFilePreviewError(e.Message);

this.InvokeOnControlThread(() =>
{
MarkdownTelemetry.Log.MarkdownFilePreviewError(e.Message);
this.Controls.Clear();
this.infoBarDisplayed = true;
this.infoBar = this.GetTextBoxControl(Resources.MarkdownNotPreviewedError);
this.Resize += this.FormResized;
this.Controls.Clear();
this.Controls.Add(this.infoBar);
base.DoPreview(dataSource);
}
});
});
}
finally
{
base.DoPreview(dataSource);
}
}

/// <summary>
Expand Down