private void SetHeadersValue(StringParameters strParams, string tagName, bool value)
{
switch (tagName.ToLower())
{
case "h1":
strParams.H1 = value;
return;
case "h2":
strParams.H2 = value;
return;
case "h3":
strParams.H3 = value;
return;
case "h4":
strParams.H4 = value;
return;
case "h5":
strParams.H5 = value;
return;
case "h6":
strParams.H6 = value;
return;
}
}
private double GetFontSize(StringParameters strParams)
{
if (strParams.H1)
{
return(_appSettings.FontSizeH1);
}
if (strParams.H2)
{
return(_appSettings.FontSizeH2);
}
if (strParams.H3)
{
return(_appSettings.FontSizeH3);
}
if (strParams.H4)
{
return(_appSettings.FontSizeH4);
}
if (strParams.H5)
{
return(_appSettings.FontSizeH5);
}
if (strParams.H6)
{
return(_appSettings.FontSizeH6);
}
return(_appSettings.FontSize);
}
private bool IsHtmlHeader(StringParameters strParams)
{
return(strParams.H1 ||
strParams.H2 ||
strParams.H3 ||
strParams.H4 ||
strParams.H5 ||
strParams.H6);
}
public List <Paragraph> GetParagraphs(string html, out IList <Image> images)
{
if (html == null)
{
images = new Image[0];
return(new List <Paragraph>());
}
var allParagraphs = new List <Paragraph>();
try
{
var parser = new HtmlParser();
var lexemes = parser.Parse(html);
var paragraph = new Paragraph {
TextAlignment = _appSettings.TextAlignment
};
allParagraphs.Add(paragraph);
for (int lexemeIndex = 0; lexemeIndex < lexemes.Length; lexemeIndex++)
{
var lexeme = lexemes[lexemeIndex];
var literalLexeme = lexeme as LiteralLexeme;
if (literalLexeme != null)
{
paragraph.Inlines.Add(new Run {
Text = literalLexeme.Text, FontSize = _appSettings.FontSize
});
continue;
}
var tagLexeme = (HtmlTagLexeme)lexeme;
if (String.Equals(tagLexeme.Name, "br", StringComparison.OrdinalIgnoreCase))
{
paragraph.Inlines.Add(new LineBreak());
continue;
}
TryAddYoutubeVideo(tagLexeme, paragraph.Inlines);
if (String.Equals(tagLexeme.Name, "img", StringComparison.OrdinalIgnoreCase))
{
AddImage(paragraph.Inlines, tagLexeme, null);
continue;
}
if (tagLexeme.IsOpen && !tagLexeme.IsClose)
{
//paragraph = new Paragraph { TextAlignment = _appSettings.TextAlignment };
//allParagraphs.Add(paragraph);
var closeIndex = GetCloseIndex(lexemeIndex, lexemes);
if (closeIndex != -1)
{
var strParams = new StringParameters();
AddBeginEnd(paragraph.Inlines, lexemes, lexemeIndex, closeIndex, strParams);
lexemeIndex = closeIndex;
}
}
}
images = _allImages;
return(allParagraphs);
}
catch (Exception e)
{
_telemetry.TrackException(e);
images = _allImages;
return(new List <Paragraph>());
}
}
private void AddBeginEnd(InlineCollection inlines, ILexeme[] lexemes, int lexemeIndex, int closeIndex, StringParameters strParams)
{
var startL = (HtmlTagLexeme)lexemes[lexemeIndex];
if (String.Equals(startL.Name, "p", StringComparison.OrdinalIgnoreCase))
{
inlines.Add(new LineBreak());
}
if (String.Equals(startL.Name, "li", StringComparison.OrdinalIgnoreCase))
{
inlines.Add(new Run()
{
Text = "• ", FontSize = _appSettings.FontSize
});
}
if (String.Equals(startL.Name, "div", StringComparison.OrdinalIgnoreCase))
{
inlines.Add(new LineBreak());
}
if (String.Equals(startL.Name, "a", StringComparison.OrdinalIgnoreCase))
{
string href;
if (startL.Attributes.TryGetValue("href", out href))
{
// skip Inoreader AD
if (href.StartsWith(@"https://www.inoreader.com/b/", StringComparison.OrdinalIgnoreCase))
{
return;
}
Uri tmp;
if (Uri.TryCreate(href, UriKind.Absolute, out tmp))
{
strParams.NavigateUri = href;
}
}
}
if (String.Equals(startL.Name, "strong", StringComparison.OrdinalIgnoreCase))
{
strParams.Bold = true;
}
SetHeadersValue(strParams, startL.Name, true);
if (String.Equals(startL.Name, "em", StringComparison.OrdinalIgnoreCase))
{
strParams.Italic = true;
}
if (String.Equals(startL.Name, "i", StringComparison.OrdinalIgnoreCase))
{
strParams.Italic = true;
}
TryAddYoutubeVideo(startL, inlines);
for (int index = lexemeIndex + 1; index < closeIndex; index++)
{
var lexeme = lexemes[index];
var literalLexeme = lexeme as LiteralLexeme;
if (literalLexeme != null)
{
var fontSize = GetFontSize(strParams);
if (String.IsNullOrWhiteSpace(strParams.NavigateUri))
{
var item = new Run {
Text = literalLexeme.Text, FontSize = fontSize
};
if (IsHtmlHeader(strParams))
{
item.FontWeight = FontWeights.Bold;
}
if (strParams.Italic)
{
item.FontStyle = FontStyle.Italic;
}
inlines.Add(item);
}
else
{
var navigateUri = new Uri(strParams.NavigateUri);
var hyperlink = new Hyperlink {
NavigateUri = navigateUri
};
hyperlink.Inlines.Add(new Run {
Text = literalLexeme.Text, FontSize = _appSettings.FontSize
});
inlines.Add(hyperlink);
inlines.Add(new Run {
Text = " ", FontSize = _appSettings.FontSize
});
}
continue;
}
var tagLexeme = (HtmlTagLexeme)lexeme;
if (String.Equals(tagLexeme.Name, "br", StringComparison.OrdinalIgnoreCase))
{
inlines.Add(new LineBreak());
continue;
}
if (String.Equals(tagLexeme.Name, "img", StringComparison.OrdinalIgnoreCase) &&
tagLexeme.IsOpen &&
tagLexeme.IsClose)
{
AddImage(inlines, tagLexeme, strParams.NavigateUri);
}
TryAddYoutubeVideo(tagLexeme, inlines);
if (tagLexeme.IsOpen && !tagLexeme.IsClose)
{
var closeIndex2 = GetCloseIndex(index, lexemes);
if (closeIndex2 != -1)
{
AddBeginEnd(inlines, lexemes, index, closeIndex2, strParams);
index = closeIndex2;
}
}
}
SetHeadersValue(strParams, startL.Name, false);
if (String.Equals(startL.Name, "em", StringComparison.OrdinalIgnoreCase))
{
strParams.Italic = false;
}
if (String.Equals(startL.Name, "i", StringComparison.OrdinalIgnoreCase))
{
strParams.Italic = false;
}
if (String.Equals(startL.Name, "p", StringComparison.OrdinalIgnoreCase))
{
inlines.Add(new LineBreak());
}
if (String.Equals(startL.Name, "li", StringComparison.OrdinalIgnoreCase))
{
inlines.Add(new LineBreak());
}
if (String.Equals(startL.Name, "div", StringComparison.OrdinalIgnoreCase))
{
inlines.Add(new LineBreak());
}
if (String.Equals(startL.Name, "a", StringComparison.OrdinalIgnoreCase))
{
strParams.NavigateUri = null;
}
if (String.Equals(startL.Name, "strong", StringComparison.OrdinalIgnoreCase))
{
strParams.Bold = false;
}
}