/// <summary>
/// </summary>
/// <param name="entities"></param>
private void RemoveOverlappingEntities(List <TweetEntity> entities)
{
// Sort by index
entities.Sort(new StartIndexComparer());
// Remove overlapping entities.
// Two entities overlap only when one is URL and the other is hashtag/mention
// which is a part of the URL. When it happens, we choose URL over hashtag/mention
// by selecting the one with smaller start index.
List <TweetEntity> toRemove = new List <TweetEntity>();
if (entities.Count > 0)
{
IEnumerator <TweetEntity> it = entities.GetEnumerator();
it.MoveNext();
TweetEntity prev = it.Current;
while (it.MoveNext())
{
TweetEntity cur = it.Current;
if (prev.End > cur.Start)
{
toRemove.Add(cur);
}
else
{
prev = cur;
}
}
foreach (TweetEntity remove in toRemove)
{
entities.Remove(remove);
}
}
}
/// <summary>
/// </summary>
/// <param name="entity"></param>
/// <param name="text"></param>
/// <param name="builder"></param>
public void LinkToCashtag(TweetEntity entity, string text, StringBuilder builder)
{
string cashtag = entity.Value;
IDictionary <string, string> attrs = new Dictionary <string, string>();
attrs["href"] = CashtagUrlBase + cashtag;
attrs["title"] = "$" + cashtag;
attrs["class"] = CashtagClass;
LinkToTextWithSymbol(entity, "$", cashtag, attrs, builder);
}
/// <summary>
/// </summary>
/// <param name="entity"></param>
/// <param name="symbol"></param>
/// <param name="text"></param>
/// <param name="attributes"></param>
/// <param name="builder"></param>
public void LinkToTextWithSymbol(TweetEntity entity, string symbol, string text, IDictionary <string, string> attributes, StringBuilder builder)
{
string taggedSymbol = string.IsNullOrWhiteSpace(SymbolTag) ? symbol : string.Format("<{0}>{1}</{0}>", SymbolTag, symbol);
text = EscapeHTML(text);
string taggedText = string.IsNullOrWhiteSpace(TextWithSymbolTag) ? text : string.Format("<{0}>{1}</{0}>", TextWithSymbolTag, text);
bool includeSymbol = UsernameIncludeSymbol || !TwitterRegex.AT_SIGNS.IsMatch(symbol);
if (includeSymbol)
{
LinkToText(entity, taggedSymbol + taggedText, attributes, builder);
}
else
{
builder.Append(taggedSymbol);
LinkToText(entity, taggedText, attributes, builder);
}
}
/// <summary>
/// </summary>
/// <param name="entity"></param>
/// <param name="text"></param>
/// <param name="builder"></param>
public void LinkToHashtag(TweetEntity entity, string text, StringBuilder builder)
{
// Get the original hash char from text as it could be a full-width char.
string hashChar = text.Substring(entity.Start, 1);
string hashtag = entity.Value;
IDictionary <string, string> attrs = new Dictionary <string, string>();
attrs["href"] = HashtagUrlBase + hashtag;
attrs["title"] = "#" + hashtag;
if (TwitterRegex.RTL_CHARACTERS.IsMatch(text))
{
attrs["class"] = HashtagClass + " rtl";
}
else
{
attrs["class"] = HashtagClass;
}
LinkToTextWithSymbol(entity, hashChar, hashtag, attrs, builder);
}
/// <summary>
/// </summary>
/// <param name="entity"></param>
/// <param name="text"></param>
/// <param name="attributes"></param>
/// <param name="builder"></param>
public void LinkToText(TweetEntity entity, string text, IDictionary <string, string> attributes, StringBuilder builder)
{
if (NoFollow)
{
attributes["rel"] = "nofollow";
}
if (LinkAttributeModifier != null)
{
LinkAttributeModifier.Modify(entity, attributes);
}
if (LinkTextModifier != null)
{
text = LinkTextModifier.Modify(entity, text);
}
// append <a> tag
builder.Append("<a");
foreach (var entry in attributes)
{
builder.Append(" ").Append(EscapeHTML(entry.Key)).Append("=\"").Append(EscapeHTML(entry.Value)).Append("\"");
}
builder.Append(">").Append(text).Append("</a>");
}
/// <summary>
/// </summary>
/// <param name="entity"></param>
/// <param name="text"></param>
/// <param name="builder"></param>
public void LinkToMentionAndList(TweetEntity entity, string text, StringBuilder builder)
{
string mention = entity.Value;
// Get the original at char from text as it could be a full-width char.
string atChar = text.Substring(entity.Start, 1);
IDictionary <string, string> attrs = new Dictionary <string, string>();
if (entity.ListSlug != null)
{
mention += entity.ListSlug;
attrs["class"] = ListClass;
attrs["href"] = ListUrlBase + mention;
}
else
{
attrs["class"] = UsernameClass;
attrs["href"] = UsernameUrlBase + mention;
}
LinkToTextWithSymbol(entity, atChar, mention, attrs, builder);
}
/// <summary>
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public override bool Equals(object obj)
{
if (this == obj)
{
return(true);
}
if (!(obj is TweetEntity))
{
return(false);
}
TweetEntity other = (TweetEntity)obj;
if (Type.Equals(other.Type) &&
Start == other.Start &&
End == other.End &&
Value.Equals(other.Value))
{
return(true);
}
return(false);
}
/// <summary>
/// </summary>
/// <param name="entity"></param>
/// <param name="text"></param>
/// <param name="builder"></param>
public void LinkTorUrl(TweetEntity entity, string text, StringBuilder builder)
{
string url = entity.Value;
string linkText = EscapeHTML(url);
if (entity.DisplayUrl != null && entity.ExpandedUrl != null)
{
// Goal: If a user copies and pastes a tweet containing t.co'ed link, the resulting paste
// should contain the full original URL (expanded_url), not the display URL.
//
// Method: Whenever possible, we actually emit HTML that contains expanded_url, and use
// font-size:0 to hide those parts that should not be displayed (because they are not part of display_url).
// Elements with font-size:0 get copied even though they are not visible.
// Note that display:none doesn't work here. Elements with display:none don't get copied.
//
// Additionally, we want to *display* ellipses, but we don't want them copied. To make this happen we
// wrap the ellipses in a tco-ellipsis class and provide an onCopy handler that sets display:none on
// everything with the tco-ellipsis class.
//
// As an example: The user tweets "hi http://longdomainname.com/foo"
// This gets shortened to "hi http://t.co/xyzabc", with display_url = "…nname.com/foo"
// This will get rendered as:
// <span class='tco-ellipsis'> <!-- This stuff should get displayed but not copied -->
// …
// <!-- There's a chance the onCopy event handler might not fire. In case that happens,
// we include an here so that the … doesn't bump up against the URL and ruin it.
// The is inside the tco-ellipsis span so that when the onCopy handler *does*
// fire, it doesn't get copied. Otherwise the copied text would have two spaces in a row,
// e.g. "hi http://longdomainname.com/foo".
// <span style='font-size:0'> </span>
// </span>
// <span style='font-size:0'> <!-- This stuff should get copied but not displayed -->
// http://longdomai
// </span>
// <span class='js-display-url'> <!-- This stuff should get displayed *and* copied -->
// nname.com/foo
// </span>
// <span class='tco-ellipsis'> <!-- This stuff should get displayed but not copied -->
// <span style='font-size:0'> </span>
// …
// </span>
//
// Exception: pic.twitter.com images, for which expandedUrl = "https://twitter.com/#!/username/status/1234/photo/1
// For those URLs, display_url is not a substring of expanded_url, so we don't do anything special to render the elided parts.
// For a pic.twitter.com URL, the only elided part will be the "https://", so this is fine.
string displayURLSansEllipses = entity.DisplayUrl.Replace("…", "");
int diplayURLIndexInExpandedURL = entity.ExpandedUrl.IndexOf(displayURLSansEllipses);
if (diplayURLIndexInExpandedURL != -1)
{
string beforeDisplayURL = entity.ExpandedUrl.Substring(0, diplayURLIndexInExpandedURL);
string afterDisplayURL = entity.ExpandedUrl.Substring(diplayURLIndexInExpandedURL + displayURLSansEllipses.Length);
string precedingEllipsis = entity.DisplayUrl.StartsWith("…") ? "…" : "";
string followingEllipsis = entity.DisplayUrl.EndsWith("…") ? "…" : "";
string invisibleSpan = "<span " + InvisibleTagAttrs + ">";
StringBuilder sb = new StringBuilder("<span class='tco-ellipsis'>");
sb.Append(precedingEllipsis);
sb.Append(invisibleSpan).Append(" </span></span>");
sb.Append(invisibleSpan).Append(EscapeHTML(beforeDisplayURL)).Append("</span>");
sb.Append("<span class='js-display-url'>").Append(EscapeHTML(displayURLSansEllipses)).Append("</span>");
sb.Append(invisibleSpan).Append(EscapeHTML(afterDisplayURL)).Append("</span>");
sb.Append("<span class='tco-ellipsis'>").Append(invisibleSpan).Append(" </span>").Append(followingEllipsis).Append("</span>");
linkText = sb.ToString();
}
else
{
linkText = entity.DisplayUrl;
}
}
IDictionary <string, string> attrs = new Dictionary <string, string>();
attrs["href"] = url;
if (!string.IsNullOrWhiteSpace(entity.DisplayUrl) && !string.IsNullOrWhiteSpace(entity.ExpandedUrl))
{
attrs["title"] = entity.ExpandedUrl;
}
if (!string.IsNullOrWhiteSpace(UrlClass))
{
attrs["class"] = UrlClass;
}
if (!string.IsNullOrWhiteSpace(UrlTarget))
{
attrs["target"] = UrlTarget;
}
LinkToText(entity, linkText, attrs, builder);
}
