1/* extern-post-js.js must be appended to the resulting sqlite3.js
2   file. It gets its name from being used as the value for the
3   --extern-post-js=... Emscripten flag. Note that this code, unlike
4   most of the associated JS code, runs outside of the
5   Emscripten-generated module init scope, in the current
6   global scope. */
7(function(){
8  /**
9     In order to hide the sqlite3InitModule()'s resulting Emscripten
10     module from downstream clients (and simplify our documentation by
11     being able to elide those details), we rewrite
12     sqlite3InitModule() to return the sqlite3 object.
13
14     Unfortunately, we cannot modify the module-loader/exporter-based
15     impls which Emscripten installs at some point in the file above
16     this.
17  */
18  const originalInit = self.sqlite3InitModule;
19  if(!originalInit){
20    throw new Error("Expecting self.sqlite3InitModule to be defined by the Emscripten build.");
21  }
22  /**
23     We need to add some state which our custom Module.locateFile()
24     can see, but an Emscripten limitation currently prevents us from
25     attaching it to the sqlite3InitModule function object:
26
27     https://github.com/emscripten-core/emscripten/issues/18071
28
29     The only(?) current workaround is to temporarily stash this state
30     into the global scope and delete it when sqlite3InitModule()
31     is called.
32  */
33  const initModuleState = self.sqlite3InitModuleState = Object.assign(Object.create(null),{
34    moduleScript: self?.document?.currentScript,
35    isWorker: ('undefined' !== typeof WorkerGlobalScope),
36    location: self.location,
37    urlParams: new URL(self.location.href).searchParams
38  });
39  initModuleState.debugModule =
40    (new URL(self.location.href).searchParams).has('sqlite3.debugModule')
41    ? (...args)=>console.warn('sqlite3.debugModule:',...args)
42    : ()=>{};
43
44  if(initModuleState.urlParams.has('sqlite3.dir')){
45    initModuleState.sqlite3Dir = initModuleState.urlParams.get('sqlite3.dir') +'/';
46  }else if(initModuleState.moduleScript){
47    const li = initModuleState.moduleScript.src.split('/');
48    li.pop();
49    initModuleState.sqlite3Dir = li.join('/') + '/';
50  }
51
52  self.sqlite3InitModule = (...args)=>{
53    //console.warn("Using replaced sqlite3InitModule()",self.location);
54    return originalInit(...args).then((EmscriptenModule)=>{
55      if(self.window!==self &&
56         (EmscriptenModule['ENVIRONMENT_IS_PTHREAD']
57          || EmscriptenModule['_pthread_self']
58          || 'function'===typeof threadAlert
59          || self.location.pathname.endsWith('.worker.js')
60         )){
61        /** Workaround for wasmfs-generated worker, which calls this
62            routine from each individual thread and requires that its
63            argument be returned. All of the criteria above are fragile,
64            based solely on inspection of the offending code, not public
65            Emscripten details. */
66        return EmscriptenModule;
67      }
68      EmscriptenModule.sqlite3.scriptInfo = initModuleState;
69      //console.warn("sqlite3.scriptInfo =",EmscriptenModule.sqlite3.scriptInfo);
70      const f = EmscriptenModule.sqlite3.asyncPostInit;
71      delete EmscriptenModule.sqlite3.asyncPostInit;
72      return f();
73    }).catch((e)=>{
74      console.error("Exception loading sqlite3 module:",e);
75      throw e;
76    });
77  };
78  self.sqlite3InitModule.ready = originalInit.ready;
79
80  if(self.sqlite3InitModuleState.moduleScript){
81    const sim = self.sqlite3InitModuleState;
82    let src = sim.moduleScript.src.split('/');
83    src.pop();
84    sim.scriptDir = src.join('/') + '/';
85  }
86  initModuleState.debugModule('sqlite3InitModuleState =',initModuleState);
87  if(0){
88    console.warn("Replaced sqlite3InitModule()");
89    console.warn("self.location.href =",self.location.href);
90    if('undefined' !== typeof document){
91      console.warn("document.currentScript.src =",
92                   document?.currentScript?.src);
93    }
94  }
95  /* Replace the various module exports performed by the Emscripten
96     glue... */
97  if (typeof exports === 'object' && typeof module === 'object')
98    module.exports = sqlite3InitModule;
99  else if (typeof exports === 'object')
100    exports["sqlite3InitModule"] = sqlite3InitModule;
101  /* AMD modules get injected in a way we cannot override,
102     so we can't handle those here. */
103})();
104