bin/cas-web from MatteoRagni/cas-rb

bin/cas-web
Summary

Maintainability

Test Coverage

Issues
#!/usr/bin/env ruby

# Spawns a web server for my smbolic computations. Each class is expanded
# with a new to_latex method

WEBPAGE = <<-EOS
<html>
  <head>
    <style>
      * {
        font-family: monospace;
      }

      body {
        height: 100%;
        margin:0;
        padding-left: 50px;
        padding-right: 50px;
        padding-top: 20px;
        padding-bottom: 20px;
      }

      h1 {
        border-bottom: 1px solid #555;
        width: 100%;
        padding-bottom: 15px;
      }

      .container {
        padding: 30px;
        width: 100%;
        margin-left: 50px;
        margin-right: 50px;
        margin-top: 30px;
        margin-bottom: 50px;
      }

      .code-input {
        width: 100%;
        background-color: #eee;
        border: 1px solid #555;
        margin-top: 15px;
        margin-bottom: 15px;
        padding: 15px;
      }

      .latex-response,
      .code-response {
        padding-top: 20px;
        padding-bottom: 20px;
        padding-left: 15px;
        padding-right: 15px;
        margin-top: 10px;
        margin-bottom: 10px;
        border: 1px solid #333;
      }
    </style>
  </head>
  <body>
    <div classs="container">
      <h1>Mr.CAS web console</h1>
      <div id="space">
        <textarea rows="1" class="code-input"> </textarea>
      </div>
      <hr>
      <p>Copyright 2016 - <a href="mailto:info@ragni.me">Matteo Ragni</a> - <a href="http://www.unitn.it">University of Trento</a> - <a href="https://github.com/MatteoRagni/cas-rb">Mr.CAS homepage</a></p>
    </div>

    <script
      type="text/javascript" async
      src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML">
    </script>
    <script>
      document.body.addEventListener('keypress', function(e) {
        if (e.key == "Enter" && e.ctrlKey) {
          var els = document.getElementsByTagName("textarea");
          els = els[els.length - 1];
          var cmd = els.value.replace(/\\+/g, '%2B');

          // console.log(cmd);
          els.disabled = true;
          var xhttp =  new XMLHttpRequest();

          xhttp.onreadystatechange = function() {
            if (xhttp.readyState == 4 && xhttp.status == 200) {
              document.getElementById("space").insertAdjacentHTML("beforeend", xhttp.responseText);
              MathJax.Hub.Typeset();
              var els = document.getElementsByTagName("textarea");
              els[els.length - 1].focus();
            }
          };

          xhttp.open("post", document.URL+"/input", true);
          xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
          xhttp.send("command="+encodeURI(cmd));
        }
      });
    </script>
  </body>
</html>
EOS

NEWLINE = <<-EOS
<p class="%%TYPE%%">%%VALUE%%</p>
<textarea rows="1" class="code-input"></textarea>
EOS

require 'Mr.CAS'
require 'sinatra'

module SandBox;
  include CAS

  def self.run
    $bind = binding()
  end
end
SandBox.run


get '/' do
  WEBPAGE
end

post '/input' do
  begin
    cmd = params[:command].gsub("%2B", "+")
    r = $bind.eval(cmd)
    if r.respond_to? :to_latex
      NEWLINE.gsub("%%TYPE%%", "latex-response").gsub("%%VALUE%%", "$$#{r.to_latex}$$")
    else
      NEWLINE.gsub("%%TYPE%%", "code-response").gsub("%%VALUE%%", "#{r.inspect}")
    end
  rescue Exception => e
    NEWLINE.gsub("%%TYPE%%", "code-response").gsub("%%VALUE%%", "ERROR: #{e}")
  end
end