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<html>
<head>
<title>
Python on the Web
</title>
<link id="bespin_base" href="skywriter/"/>
<script src="skywriter/BespinEmbedded.js"></script>
<style type="text/css">
.bespin {
width: 80%;
height: 30%;
}
</style>
<!--
The attached python.js (or python.cc.js) is CPython 2.7.1, licensed under
the PSF: http://docs.python.org/license.html
Additional steps to create this demo:
* Compile with _PyRun_SimpleStringFlags exported in EXPORTED_FUNCTIONS
* Find the actual name of that function (closure changes it, see .vars), and use it as per the XXX comment below.
-->
<script>
var Module = {
noInitialRun: true
};
</script>
<script src="python.cc.js"></script>
<script>
var orig = Module._PyRun_SimpleStringFlags;
var RAN_ALREADY;
QDb = function() { // XXX Have the actual name here! See comment above.
if(!RAN_ALREADY) {
RAN_ALREADY = true;
throw "halting, since this is the first run";
}
orig.apply(null, arguments);
}
// print function which the Python engine will call
var lines = [], printed = false;
function print(text, force) {
//force = true; // XXX - for debugging
lines.push(text);
printed = true;
if (force) {
var element = document.getElementById('output');
element.value = text;
}
}
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, 'i8'); // leak!
try {
Module._PyRun_SimpleStringFlags(ptr, 0);
} catch(e) {
if (e === 'halting, since this is the first run') {
return;
}
element.value = 'JS crash:\n\n' + e + '\n\nPlease let us know about this problem!\n' + element.value;
return;
}
if (printed) {
element.value = element.value + lines.join('\n') + '\n';
// scroll down
var len = element.textLength;
element.setSelectionRange(len-1, len);
}
}
var editor;
function doRun() {
args = ['-S', '-c', 'print 5'];
try {
Module.run(args);
} catch (e) {
if (e !== 'halting, since this is the first run') {
throw e;
}
}
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()">
<h1>Python on the Web</h1>
<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). It is both a tech demo and also a usable tool, for example, to
assist in teaching people Python by just visiting a website (instead of installing Python locally).
</p>
<p>
Notes:
<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>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 %s, here are some numbers:' % raw_input('What is your name?'), [2*x for x in range(5)][:4]
print 'This is Python {} on {}'.format(sys.version, sys.platform)
</div>
</form>
<hr>
<textarea id="output" style="font-family: monospace; width: 80%" rows="8" readonly></textarea>
</body>
</html>
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