1 files changed, 126 insertions, 0 deletions
diff --git a/ext/wasm/api/extern-post-js.c-pp.js b/ext/wasm/api/extern-post-js.c-pp.js
new file mode 100644
index 0000000..63e5505
--- /dev/null
+++ b/ext/wasm/api/extern-post-js.c-pp.js
@@ -0,0 +1,126 @@
+
+/* ^^^^ ACHTUNG: blank line at the start is necessary because
+   Emscripten will not add a newline in some cases and we need
+   a blank line for a sed-based kludge for the ES6 build. */
+/* extern-post-js.js must be appended to the resulting sqlite3.js
+   file. It gets its name from being used as the value for the
+   --extern-post-js=... Emscripten flag. Note that this code, unlike
+   most of the associated JS code, runs outside of the
+   Emscripten-generated module init scope, in the current
+   global scope. */
+//#if target=es6-module
+const toExportForESM =
+//#endif
+(function(){
+  /**
+     In order to hide the sqlite3InitModule()'s resulting
+     Emscripten module from downstream clients (and simplify our
+     documentation by being able to elide those details), we hide that
+     function and expose a hand-written sqlite3InitModule() to return
+     the sqlite3 object (most of the time).
+
+     Unfortunately, we cannot modify the module-loader/exporter-based
+     impls which Emscripten installs at some point in the file above
+     this.
+  */
+  const originalInit = sqlite3InitModule;
+  if(!originalInit){
+    throw new Error("Expecting globalThis.sqlite3InitModule to be defined by the Emscripten build.");
+  }
+  /**
+     We need to add some state which our custom Module.locateFile()
+     can see, but an Emscripten limitation currently prevents us from
+     attaching it to the sqlite3InitModule function object:
+
+     https://github.com/emscripten-core/emscripten/issues/18071
+
+     The only(?) current workaround is to temporarily stash this state
+     into the global scope and delete it when sqlite3InitModule()
+     is called.
+  */
+  const initModuleState = globalThis.sqlite3InitModuleState = Object.assign(Object.create(null),{
+    moduleScript: globalThis?.document?.currentScript,
+    isWorker: ('undefined' !== typeof WorkerGlobalScope),
+    location: globalThis.location,
+    urlParams:  globalThis?.location?.href
+      ? new URL(globalThis.location.href).searchParams
+      : new URLSearchParams()
+  });
+  initModuleState.debugModule =
+    initModuleState.urlParams.has('sqlite3.debugModule')
+    ? (...args)=>console.warn('sqlite3.debugModule:',...args)
+    : ()=>{};
+
+  if(initModuleState.urlParams.has('sqlite3.dir')){
+    initModuleState.sqlite3Dir = initModuleState.urlParams.get('sqlite3.dir') +'/';
+  }else if(initModuleState.moduleScript){
+    const li = initModuleState.moduleScript.src.split('/');
+    li.pop();
+    initModuleState.sqlite3Dir = li.join('/') + '/';
+  }
+
+  globalThis.sqlite3InitModule = function ff(...args){
+    //console.warn("Using replaced sqlite3InitModule()",globalThis.location);
+    return originalInit(...args).then((EmscriptenModule)=>{
+//#if wasmfs
+      if('undefined'!==typeof WorkerGlobalScope &&
+         EmscriptenModule['ENVIRONMENT_IS_PTHREAD']){
+        /** Workaround for wasmfs-generated worker, which calls this
+            routine from each individual thread and requires that its
+            argument be returned. The conditional criteria above are
+            fragile, based solely on inspection of the offending code,
+            not public Emscripten details. */
+        //console.warn("sqlite3InitModule() returning E-module.",EmscriptenModule);
+        return EmscriptenModule;
+      }
+//#endif
+      //console.warn("sqlite3InitModule() returning sqlite3 object.");
+      const s = EmscriptenModule.sqlite3;
+      s.scriptInfo = initModuleState;
+      //console.warn("sqlite3.scriptInfo =",s.scriptInfo);
+      if(ff.__isUnderTest) s.__isUnderTest = true;
+      const f = s.asyncPostInit;
+      delete s.asyncPostInit;
+      return f();
+    }).catch((e)=>{
+      console.error("Exception loading sqlite3 module:",e);
+      throw e;
+    });
+  };
+  globalThis.sqlite3InitModule.ready = originalInit.ready;
+
+  if(globalThis.sqlite3InitModuleState.moduleScript){
+    const sim = globalThis.sqlite3InitModuleState;
+    let src = sim.moduleScript.src.split('/');
+    src.pop();
+    sim.scriptDir = src.join('/') + '/';
+  }
+  initModuleState.debugModule('sqlite3InitModuleState =',initModuleState);
+  if(0){
+    console.warn("Replaced sqlite3InitModule()");
+    console.warn("globalThis.location.href =",globalThis.location.href);
+    if('undefined' !== typeof document){
+      console.warn("document.currentScript.src =",
+                   document?.currentScript?.src);
+    }
+  }
+//#ifnot target=es6-module
+// Emscripten does not inject these module-loader bits in ES6 module
+// builds and including them here breaks JS bundlers, so elide them
+// from ESM builds.
+  /* Replace the various module exports performed by the Emscripten
+     glue... */
+  if (typeof exports === 'object' && typeof module === 'object'){
+    module.exports = sqlite3InitModule;
+  }else if (typeof exports === 'object'){
+    exports["sqlite3InitModule"] = sqlite3InitModule;
+  }
+  /* AMD modules get injected in a way we cannot override,
+     so we can't handle those here. */
+//#endif // !target=es6-module
+  return globalThis.sqlite3InitModule /* required for ESM */;
+})();
+//#if target=es6-module
+sqlite3InitModule = toExportForESM;
+export default sqlite3InitModule;
+//#endif