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08 Mar 2015 by Super Human
Convert url in text to hyperlink with option to add nofollow attributeFind all Urls in plain text and replace them with HTML hyper links. This should allow adding a nofollow attribute, and an option of link opening in a new window.
Contract
IStringUtilities
string ConvertPlainTextUrlsToHtmlHyperlinks(string input, HyperlinkOptions options = HyperlinkOptions.None);
Models
public enum HyperlinkOptions
{
None = 0,
OpenInNewWindow = 1,
NoFollow = 2
}
Test Cases
NoOptions_ShouldParseLinkWithoutAdditionalAttributes
Created By Super Human
public void NoOptions_ShouldParseLinkWithoutAdditionalAttributes(IStringUtilities util)
{
string test = @"This is a test for problem definition at http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096";
var result = util.ConvertPlainTextUrlsToHtmlHyperlinks(test, HyperlinkOptions.None);
var doc = new XmlDocument();
doc.LoadXml(result.Replace("This is a test for problem definition at ", String.Empty));
Assert.AreEqual("a", doc.FirstChild.Name);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.Attributes["href"].Value);
Assert.AreEqual(null, doc.FirstChild.Attributes["rel"]);
Assert.AreEqual(null, doc.FirstChild.Attributes["target"]);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.InnerText);
}
NoFollowOption_ShouldParseLinkWithNoFollowAttribute
Created By Super Human
public void NoFollowOption_ShouldParseLinkWithNoFollowAttribute(IStringUtilities util)
{
string test = @"This is a test for problem definition at http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096";
var result = util.ConvertPlainTextUrlsToHtmlHyperlinks(test, HyperlinkOptions.NoFollow);
var doc = new XmlDocument();
doc.LoadXml(result.Replace("This is a test for problem definition at ", String.Empty));
Assert.AreEqual("a", doc.FirstChild.Name);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.Attributes["href"].Value);
Assert.AreEqual("nofollow", doc.FirstChild.Attributes["rel"].Value);
Assert.AreEqual(null, doc.FirstChild.Attributes["target"]);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.InnerText);
}
NewWindowOption_ShouldParseLinkWithBlankTargetAttribute
Created By Super Human
public void NewWindowOption_ShouldParseLinkWithBlankTargetAttribute(IStringUtilities util)
{
string test = @"This is a test for problem definition at http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096";
var result = util.ConvertPlainTextUrlsToHtmlHyperlinks(test, HyperlinkOptions.OpenInNewWindow);
var doc = new XmlDocument();
doc.LoadXml(result.Replace("This is a test for problem definition at ", String.Empty));
Assert.AreEqual("a", doc.FirstChild.Name);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.Attributes["href"].Value);
Assert.AreEqual(null, doc.FirstChild.Attributes["rel"]);
Assert.AreEqual("_blank", doc.FirstChild.Attributes["target"].Value);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.InnerText);
}
NewWindowAndNoFollow_ShouldParseLinkWithTargetAndRelAttributes
Created By Super Human
public void NewWindowAndNoFollow_ShouldParseLinkWithTargetAndRelAttributes(IStringUtilities util)
{
string test = @"This is a test for problem definition at http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096";
var result = util.ConvertPlainTextUrlsToHtmlHyperlinks(test, HyperlinkOptions.OpenInNewWindow | HyperlinkOptions.NoFollow);
var doc = new XmlDocument();
doc.LoadXml(result.Replace("This is a test for problem definition at ", String.Empty));
Assert.AreEqual("a", doc.FirstChild.Name);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.Attributes["href"].Value);
Assert.AreEqual("nofollow", doc.FirstChild.Attributes["rel"].Value);
Assert.AreEqual("_blank", doc.FirstChild.Attributes["target"].Value);
Assert.AreEqual("http://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.InnerText);
}
ShouldParseHttpsLink
Created By Super Human
public void ShouldParseHttpsLink(IStringUtilities util)
{
string test = @"This is a test for problem definition at https://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096";
var result = util.ConvertPlainTextUrlsToHtmlHyperlinks(test, HyperlinkOptions.None);
var doc = new XmlDocument();
doc.LoadXml(result.Replace("This is a test for problem definition at ", String.Empty));
Assert.AreEqual("a", doc.FirstChild.Name);
Assert.AreEqual("https://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.Attributes["href"].Value);
Assert.AreEqual(null, doc.FirstChild.Attributes["rel"]);
Assert.AreEqual(null, doc.FirstChild.Attributes["target"]);
Assert.AreEqual("https://www.volatileread.com/UtilityLibrary/EditDefinition?id=2096", doc.FirstChild.InnerText);
}
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08 Mar 2015 by Super Human
public class Solution : IStringUtilities
{
public string ConvertPlainTextUrlsToHtmlHyperlinks(string input, HyperlinkOptions options = HyperlinkOptions.None)
{
Regex r = new Regex("(https?://[^ ]+)");
var target = (options & HyperlinkOptions.OpenInNewWindow) == HyperlinkOptions.OpenInNewWindow ?
" target='_blank'" : String.Empty;
var noFollow = (options & HyperlinkOptions.NoFollow) == HyperlinkOptions.NoFollow ?
" rel='nofollow'" : String.Empty;
return r.Replace(input, String.Format("<a href=\"$1\"{0}{1}>$1</a>", target, noFollow));
}
}
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Test Case Run Summary
NoOptions_ShouldParseLinkWithoutAdditionalAttributes
NoFollowOption_ShouldParseLinkWithNoFollowAttribute
NewWindowOption_ShouldParseLinkWithBlankTargetAttribute
NewWindowAndNoFollow_ShouldParseLinkWithTargetAndRelAttributes
ShouldParseHttpsLink
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Comments
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08 Mar 2015 by Super Human
public class Solution : IStringUtilities
{
public string ConvertPlainTextUrlsToHtmlHyperlinks(string input, HyperlinkOptions options = HyperlinkOptions.None)
{
var regex =
@"((www\.|(http|https|ftp|news|file)+\:\/\/)[_.a-z0-9-]+\.[a-z0-9\/_:@=.+?,##%&~-]*[^.|\'|\# |!|\(|?|,| |>|<|;|\)])";
Regex r = new Regex(regex, RegexOptions.IgnoreCase);
var target = (options & HyperlinkOptions.OpenInNewWindow) == HyperlinkOptions.OpenInNewWindow ?
" target='_blank'" : String.Empty;
var noFollow = (options & HyperlinkOptions.NoFollow) == HyperlinkOptions.NoFollow ?
" rel='nofollow'" : String.Empty;
return r.Replace(input, String.Format("<a href=\"$1\"{0}{1}>$1</a>",target, noFollow));
}
}
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Test Case Run Summary
NoOptions_ShouldParseLinkWithoutAdditionalAttributes
NoFollowOption_ShouldParseLinkWithNoFollowAttribute
NewWindowOption_ShouldParseLinkWithBlankTargetAttribute
NewWindowAndNoFollow_ShouldParseLinkWithTargetAndRelAttributes
ShouldParseHttpsLink
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| download solution | ||||
| Try this Solution | ||||
|
Comments
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