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

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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