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<html>
<head>
<title>
Emscripten: Python
</title>
<link id="bespin_base" href="skywriter/"/>
<script src="skywriter/BespinEmbedded.js"></script>
<style type="text/css">
.bespin {
width: 80%;
height: 30%;
}
</style>
<!-- Changes from automatically generated code: arguments and run(), and in _PyRun_SimpleStringFlags, add
if(!this.RAN_ALREADY){this.RAN_ALREADY=true;throw "halting, since this is the first run" } -->
<script src="python.js"></script>
<script>
// print function which the Python engine will call
var lines = [], printed = false;
function print(text) {
lines.push(text);
printed = true;
}
function execute(text) {
lines = [];
printed = false;
var element = document.getElementById('output');
if (!element) return; // perhaps during startup
var ptr = Module.Pointer_make(Module.intArrayFromString(text), 0, 2); // leak!
try {
Module._PyRun_SimpleStringFlags(ptr, 0);
} catch(e) {
if (e === 'halting, since this is the first run') return;
element.innerHTML = 'JS crash: |<b>' + e + '</b>|. Please let us know about this problem!<hr>' + element.innerHTML;
return;
}
if (printed) {
element.innerHTML = lines.map(function(line) { return line.replace('<', '<', 'g') }).join('<br>') + '<hr>' + element.innerHTML;
} else {
element.innerHTML = '<small><i>(no output)</i></small><hr>' + element.innerHTML;
}
}
var editor;
function doRun() {
args = ['-S', '-c', 'print ""'];
try {
Module.run(args);
} catch (e) {
if (e !== 'halting, since this is the first run') throw e;
}
execute("");
setTimeout(function() {
if (!bespin.useBespin) setTimeout(arguments.callee, 10);
bespin.useBespin(document.getElementById('the_input'), { "stealFocus":true, "syntax": "python" }).then(function(env) {
editor = env.editor;
});
}, 10);
}
</script>
</head>
<body onload="doRun(); document.getElementById('the_input').focus()">
<p>
This is CPython, the standard <a href="http://www.python.org">Python</a> implementation, compiled from C to
JavaScript using <a href="http://emscripten.org">Emscripten</a>,
running in your browser (without any plugins).
</p>
<p>
<ul>
<li>Most core language stuff should work, except for importing non-static modules (in other words, <code>import sys</code> will
work, but other modules won't).</li>
<li>Please report bugs if you find them!</li>
<li>Note that this is an unoptimized build (see <a href="http://code.google.com/p/emscripten/issues/detail?id=8">issue 8</a>),
so it may run slowly. Speed may depend on the browser - Chrome 8 in particular is slow, dunno why (maybe
<a href="http://code.google.com/p/v8/issues/detail?id=947">V8 issue 947</a>?). Firefox 4 beta 7+ is recommended.</li>
<li>The editor is <a href="https://mozillalabs.com/skywriter/">Skywriter</a>.
</ul>
</p>
<hr>
<!-- Call Python's execution function -->
<form onsubmit="execute(editor.value); return false">
<b>Enter some Python</b>:
<input type="submit" value="execute">
<div id="the_input">import sys
print 'Hello world! This is Python {} on {}'.format(sys.version, sys.platform)
print 'Here are some numbers:', [2*x for x in range(5)][:4]
</div>
</form>
<hr>
<div id="output" style="font-family: Courier New,Courier,monospace;"></div>
</body>
</html>
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