Problem of the Day
A new programming or logic puzzle every Mon-Fri

Today's objective marks the beginning of our Twitter killering app...or you know just a fun little project. Given a string of text parse out the hashtags and the links. If you're up for the challenge or just want some super duper bonus points build your solution in to the Markdown parser you built earlier this week.

Sample input:

#solving problems like a boss http://www.problemotd.com/problem/vigenere-cipher/?show=1#33 #problemotd

Sample output:

<a href="https://twitter.com/search?q=%23solving&src=hash">#solving</a> problems like a boss <a href="http://www.problemotd.com/problem/vigenere-cipher/?show=1#33">http://www.problemotd.com/problem/vigenere-cipher/?show=1#33</a> <a href="https://twitter.com/search?q=%23problemotd&src=hash">#problemotd</a>

Comments:

• Efraya - 10 years, 9 months ago

  using System;
  using System.Collections.Generic;
  using System.IO;
  using System.Linq;
  
  namespace Markdown_Parser
  {
      class Program
      {
          static void Main(string[] args)
          {
              if(args.Any() == false || args.Count() > 1
                  || args[0].EndsWith(".txt") == false)
              {
                  Console.WriteLine("Supply a .txt file to get a markdown parser");
                  Console.ReadKey();
              }
  
              List<string> inFile = File.ReadAllLines(args[0]).ToList();
              List<string> outFile = new List<string>();
  
              bool startedList = false;
  
              foreach(string line in inFile)
              {
                  if (startedList && line.StartsWith("* ") == false)
                  {
                      startedList = false;
                      outFile.Add("</ul>");
                  }
                  if(line.StartsWith("#"))
                  {
                      if (line.StartsWith("## "))
                      {
                          outFile.Add(string.Format("<h2>{0}</h2>", line.TrimStart("## ".ToCharArray())));
                      }
                      else //I have a hashtag
                      {
                          string[] items = line.Split(' ');
                          string hashTag = items[0];
  
                          outFile.Add(string.Format("<a href=\"https://twitter.com/search?q=%23solving&src=hash\">{0}</a>{1}", 
                                                      hashTag, line.Replace(hashTag,string.Empty)));
                      }
                  }
                  else if(string.IsNullOrEmpty(line))
                  {
                      outFile.Add(string.Empty);
                  }
                  else if(line.StartsWith("* "))
                  {
                      if(startedList == false)
                      {
                          startedList = true;
                          outFile.Add("<ul>");
                      }
                      else
                      {
                          outFile.Add(string.Format("\t<li>{0}</li>", line.TrimStart("* ".ToCharArray())));
                      }
                  }
                  else
                  {
                      //Have a URL or normal text
                      outFile.Add(Uri.IsWellFormedUriString(line, UriKind.Absolute) ? string.Format("<a href=\"{0}\">{0}</a>", line) 
                                                                                      : string.Format("<p>{0}</p>", line));
                  }
              }
  
              outFile.ForEach(Console.WriteLine);
              Console.ReadKey();
          }
      }
  }
  

  reply permalink

• Anonymous - 10 years, 9 months ago

  primitive haskell solution

  import System.IO

  main = do inp <- getLine putStrLn (cmain inp)

  cmain :: String -> String cmain a = convert (words a)

  convert :: [String] -> String convert [] = [] convert (x:xs) = check x ++ " " ++ convert xs

  check :: String -> String check a@(x:xs) = if x == '#' then conv a else a

  conv :: String -> String conv a@(x:xs) = "<a href=\"https://twitter.com/search?q=%23" ++ xs ++ "&src=hash\">" ++ a ++ "</a>"

  reply permalink

• Anonymous - 10 years, 9 months ago

  "Welcome to Problem Of The Day: where the problems are made up and the points don't matter!"

  reply permalink

• Anonymous - 10 years, 7 months ago

  I wanted to try a regex solution. Here is one that is tested extensively using the single example in my Chrome console:

  var str = "#solving problems like a boss http://www.problemotd.com/problem/vigenere-cipher/?show=1#33 #problemotd"
  var hashtags = str.match(new RegExp("(#[a-zA-Z]+\W?)", "g"));
  var urls = str.match(new RegExp("(http[s]?://[a-zA-Z0-9\./?#&-=]+\W?)", "g"))
  for (var i = 0; i < urls.length; i++) { str = str.replace(urls[i], '<a href="' + urls[i] + '">' + urls[i] + '</a>'); }
  "#solving problems like a boss <a href="http://www.problemotd.com/problem/vigenere-cipher/?show=1#33">http://www.problemotd.com/problem/vigenere-cipher/?show=1#33</a> #problemotd"
  for (var i = 0; i < hashtags.length; i++) { str = str.replace(hashtags[i], '<a href="https://twitter.com/search?q=%23' + hashtags[i].substr(1) + '&src=hash">' + hashtags[i] + '</a>'); }
  "<a href="https://twitter.com/search?q=%23solving&src=hash">#solving</a> problems like a boss <a href="http://www.problemotd.com/problem/vigenere-cipher/?show=1#33">http://www.problemotd.com/problem/vigenere-cipher/?show=1#33</a> <a href="https://twitter.com/search?q=%23problemotd&src=hash">#problemotd</a>"
  

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