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hello_world.js
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81 lines (65 loc) · 2.18 KB
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// Copyright 2013 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
// *** Environment setup code ***
var arguments_ = [];
var ENVIRONMENT_IS_NODE = typeof process === 'object';
var ENVIRONMENT_IS_WEB = typeof window === 'object';
var ENVIRONMENT_IS_WORKER = typeof importScripts === 'function';
var ENVIRONMENT_IS_SHELL = !ENVIRONMENT_IS_WEB && !ENVIRONMENT_IS_NODE && !ENVIRONMENT_IS_WORKER;
if (ENVIRONMENT_IS_NODE) {
// Expose functionality in the same simple way that the shells work
// Note that we pollute the global namespace here, otherwise we break in node
print = function(x) {
process['stdout'].write(x + '\n');
};
printErr = function(x) {
process['stderr'].write(x + '\n');
};
var nodeFS = require('fs');
read = function(filename) {
var ret = nodeFS['readFileSync'](filename).toString();
if (!ret && filename[0] != '/') {
filename = __dirname.split('/').slice(0, -1).join('/') + '/src/' + filename;
ret = nodeFS['readFileSync'](filename).toString();
}
return ret;
};
arguments_ = process['argv'].slice(2);
} else if (ENVIRONMENT_IS_SHELL) {
// Polyfill over SpiderMonkey/V8 differences
if (!this['read']) {
this['read'] = function(f) { snarf(f) };
}
if (typeof scriptArgs != 'undefined') {
arguments_ = scriptArgs;
} else if (typeof arguments != 'undefined') {
arguments_ = arguments;
}
} else if (ENVIRONMENT_IS_WEB) {
this['print'] = printErr = function(x) {
console.log(x);
};
this['read'] = function(url) {
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
xhr.send(null);
return xhr.responseText;
};
if (this['arguments']) {
arguments_ = arguments;
}
} else if (ENVIRONMENT_IS_WORKER) {
// We can do very little here...
} else {
throw 'Unknown runtime environment. Where are we?';
}
if (typeof printErr === 'undefined') {
this['printErr'] = function(){};
}
if (typeof print === 'undefined') {
this['print'] = printErr;
}
// *** Environment setup code ***
print('hello, world!');