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drift/extras/flutter_web_worker_example/web/sql-wasm.js

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// We are modularizing this manually because the current modularize setting in Emscripten has some issues:
// https://github.com/kripken/emscripten/issues/5820
// In addition, When you use emcc's modularization, it still expects to export a global object called `Module`,
// which is able to be used/called before the WASM is loaded.
// The modularization below exports a promise that loads and resolves to the actual sql.js module.
// That way, this module can't be used before the WASM is finished loading.
// We are going to define a function that a user will call to start loading initializing our Sql.js library
// However, that function might be called multiple times, and on subsequent calls, we don't actually want it to instantiate a new instance of the Module
// Instead, we want to return the previously loaded module
// TODO: Make this not declare a global if used in the browser
var initSqlJsPromise = undefined;
var initSqlJs = function (moduleConfig) {
if (initSqlJsPromise){
return initSqlJsPromise;
}
// If we're here, we've never called this function before
initSqlJsPromise = new Promise(function (resolveModule, reject) {
// We are modularizing this manually because the current modularize setting in Emscripten has some issues:
// https://github.com/kripken/emscripten/issues/5820
// The way to affect the loading of emcc compiled modules is to create a variable called `Module` and add
// properties to it, like `preRun`, `postRun`, etc
// We are using that to get notified when the WASM has finished loading.
// Only then will we return our promise
// If they passed in a moduleConfig object, use that
// Otherwise, initialize Module to the empty object
var Module = typeof moduleConfig !== 'undefined' ? moduleConfig : {};
// EMCC only allows for a single onAbort function (not an array of functions)
// So if the user defined their own onAbort function, we remember it and call it
var originalOnAbortFunction = Module['onAbort'];
Module['onAbort'] = function (errorThatCausedAbort) {
reject(new Error(errorThatCausedAbort));
if (originalOnAbortFunction){
originalOnAbortFunction(errorThatCausedAbort);
}
};
Module['postRun'] = Module['postRun'] || [];
Module['postRun'].push(function () {
// When Emscripted calls postRun, this promise resolves with the built Module
resolveModule(Module);
});
// There is a section of code in the emcc-generated code below that looks like this:
// (Note that this is lowercase `module`)
// if (typeof module !== 'undefined') {
// module['exports'] = Module;
// }
// When that runs, it's going to overwrite our own modularization export efforts in shell-post.js!
// The only way to tell emcc not to emit it is to pass the MODULARIZE=1 or MODULARIZE_INSTANCE=1 flags,
// but that carries with it additional unnecessary baggage/bugs we don't want either.
// So, we have three options:
// 1) We undefine `module`
// 2) We remember what `module['exports']` was at the beginning of this function and we restore it later
// 3) We write a script to remove those lines of code as part of the Make process.
//
// Since those are the only lines of code that care about module, we will undefine it. It's the most straightforward
// of the options, and has the side effect of reducing emcc's efforts to modify the module if its output were to change in the future.
// That's a nice side effect since we're handling the modularization efforts ourselves
module = undefined;
// The emcc-generated code and shell-post.js code goes below,
// meaning that all of it runs inside of this promise. If anything throws an exception, our promise will abort
var e;e||(e=typeof Module !== 'undefined' ? Module : {});null;
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var xb=e.__get_tzname=function(){return(xb=e.__get_tzname=e.asm.Fa).apply(null,arguments)},vb=e.__get_daylight=function(){return(vb=e.__get_daylight=e.asm.Ga).apply(null,arguments)},ub=e.__get_timezone=function(){return(ub=e.__get_timezone=e.asm.Ha).apply(null,arguments)},oa=e.stackSave=function(){return(oa=e.stackSave=e.asm.Ia).apply(null,arguments)},qa=e.stackRestore=function(){return(qa=e.stackRestore=e.asm.Ja).apply(null,arguments)},y=e.stackAlloc=function(){return(y=e.stackAlloc=e.asm.Ka).apply(null,
arguments)},gd=e._memalign=function(){return(gd=e._memalign=e.asm.La).apply(null,arguments)};e.cwrap=function(a,b,c,d){c=c||[];var f=c.every(function(g){return"number"===g});return"string"!==b&&f&&!d?Qa(a):function(){return Ra(a,b,c,arguments)}};e.UTF8ToString=A;e.stackSave=oa;e.stackRestore=qa;e.stackAlloc=y;var jd;gb=function kd(){jd||ld();jd||(gb=kd)};
function ld(){function a(){if(!jd&&(jd=!0,e.calledRun=!0,!Pa)){e.noFSInit||Uc||(Uc=!0,Tc(),e.stdin=e.stdin,e.stdout=e.stdout,e.stderr=e.stderr,e.stdin?Vc("stdin",e.stdin):ic("/dev/tty","/dev/stdin"),e.stdout?Vc("stdout",null,e.stdout):ic("/dev/tty","/dev/stdout"),e.stderr?Vc("stderr",null,e.stderr):ic("/dev/tty1","/dev/stderr"),u("/dev/stdin","r"),u("/dev/stdout","w"),u("/dev/stderr","w"));nb(ab);Sb=!1;nb(bb);if(e.onRuntimeInitialized)e.onRuntimeInitialized();if(e.postRun)for("function"==typeof e.postRun&&
(e.postRun=[e.postRun]);e.postRun.length;){var b=e.postRun.shift();cb.unshift(b)}nb(cb)}}if(!(0<eb)){if(e.preRun)for("function"==typeof e.preRun&&(e.preRun=[e.preRun]);e.preRun.length;)db();nb($a);0<eb||(e.setStatus?(e.setStatus("Running..."),setTimeout(function(){setTimeout(function(){e.setStatus("")},1);a()},1)):a())}}e.run=ld;if(e.preInit)for("function"==typeof e.preInit&&(e.preInit=[e.preInit]);0<e.preInit.length;)e.preInit.pop()();noExitRuntime=!0;ld();
// The shell-pre.js and emcc-generated code goes above
return Module;
}); // The end of the promise being returned
return initSqlJsPromise;
} // The end of our initSqlJs function
// This bit below is copied almost exactly from what you get when you use the MODULARIZE=1 flag with emcc
// However, we don't want to use the emcc modularization. See shell-pre.js
if (typeof exports === 'object' && typeof module === 'object'){
module.exports = initSqlJs;
// This will allow the module to be used in ES6 or CommonJS
module.exports.default = initSqlJs;
}
else if (typeof define === 'function' && define['amd']) {
define([], function() { return initSqlJs; });
}
else if (typeof exports === 'object'){
exports["Module"] = initSqlJs;
}
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