| <html> |
| <head> |
| <title> |
| Emscripten: CubeScript |
| </title> |
| <script src="cubescript.js"></script> |
| <script> |
| // print function which the cubescript engine will call |
| function print(text) { |
| document.getElementById('output').innerHTML += text + '<br>'; |
| printed = true; |
| } |
| |
| function execute(text) { |
| printed = false; |
| executeCS(text); |
| if (!printed) { |
| print('<small><i>(no output)</i></small>'); |
| } |
| } |
| </script> |
| </head> |
| <body onload="document.getElementById('the_input').focus()"> |
| <p> |
| This is an <a href="http://emscripten.org">Emscriptened</a> <a href="http://sauerbraten.org/docs/config.html#cubescript">CubeScript</a> engine. |
| The CubeScript engine from <a href="http://sauerbraten.org">Sauerbraten</a>, which is about 2,500 lines of C++, was compiled by |
| <a href="http://llvm.org/cmds/llvmgcc.html">llvm-gcc</a> into <a href="http://llvm.org/">LLVM</a> bitcode, |
| which was translated by Emscripten into JavaScript, which |
| you can run in your browser here. In other words, it's a script engine (for one language, and written in C++) running in another script engine |
| (the JavaScript engine in your browser, which is incidentally also written in C++, most likely). |
| </p> |
| </p> |
| Why? <i>[insert Internet meme joke here]</i> Seriously, though, this is a test of the capabilities of |
| <a href="http://emscripten.org">Emscripten</a>, since the CubeScript engine uses fairly complicated C++ (even stuff like |
| manually copying vtable pointers), and since compiling an actual, complete script engine seems like a useful milestone. |
| Also, it's a potential first step |
| towards bringing <a href="http://www.syntensity.com">Syntensity</a> (which is based on Sauerbraten) to the web. |
| </p> |
| <hr> |
| <p> |
| <b>Instructions</b>: For example, try entering the following commands in the input field below: |
| <ul> |
| <li><div style="font-family: Courier New,Courier,monospace;">echo Hello world</div></li> |
| <li><div style="font-family: Courier New,Courier,monospace;">x = 3 </div> <small><i>(note the spaces around the '=')</i></small></li> |
| <li><div style="font-family: Courier New,Courier,monospace;">echo $x</div></li> |
| <li><div style="font-family: Courier New,Courier,monospace;">echo Another number: (+ $x (* 5 10)) </div><small><i>(note the prefix notation, that is the same as <b>$x + (5*10)</b>)</i></small></li> |
| <li><div style="font-family: Courier New,Courier,monospace;">if (> $x 2) [ echo "x is bigger than 2" ] [ echo "x is not bigger than 2" ]</div></li> |
| </ul> |
| Check out the CubeScript <a href="http://sauerbraten.org/docs/config.html#cubescript">docs</a> or |
| <a href="http://cube.wikispaces.com/Cubescript+Tutorial">tutorial</a> |
| for more (but, they mainly talk about using CubeScript in Sauerbraten itself - much like most |
| JavaScript tutorials talk about using JavaScript in a web browser). |
| </p> |
| <hr> |
| <!-- Call the cubescript engine's execute() function --> |
| <form onsubmit="execute(the_input.value); the_input.value = ''; return false"> |
| <b>Enter some CubeScript</b>: |
| <input type="text" id="the_input"> |
| <input type="submit" value="execute"> |
| </form> |
| <hr> |
| <div id="output" style="font-family: Courier New,Courier,monospace;"></div> |
| </body> |
| </html> |
| |
