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Apply considerable acrobatics to get the JS/WASM deliverables building to and loadable from a directory other than the one which contains the app-level code. Requires an only-slightly-leaky abstraction of passing a URL argument when loading sqlite3.js but provides much greater flexibility in where the JS/WASM files are located.

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FossilOrigin-Name: 6d468dab9eb84d4548f68014959f02fe4f66455472ff24fe729382bb2972e3d1
This commit is contained in:
stephan
2022-10-19 04:44:58 +00:00
parent 71de8e0241
commit cd0df83c15
27 changed files with 250 additions and 76 deletions
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44
ext/wasm/api/pre-js.js
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@ -4,9 +4,49 @@
This file is intended to be prepended to the sqlite3.js build using
Emscripten's --pre-js=THIS_FILE flag (or equivalent).
*/
// See notes in extern-post-js.js
const sqlite3InitModuleState = self.sqlite3InitModuleState || Object.create(null);
delete self.sqlite3InitModuleState;
/**
This custom locateFile() tries to figure out where to load `path`
from. The intent is to provide a way for foo/bar/X.js loaded from a
Worker constructor or importScripts() to be able to resolve
foo/bar/X.wasm (in the latter case, with some help):
1) If URL param named the same as `path` is set, it is returned.
2) If sqlite3InitModuleState.sqlite3Dir is set, then (thatName + path)
is returned (note that it's assumed to end with '/').
3) If this code is running in the main UI thread AND it was loaded
from a SCRIPT tag, the directory part of that URL is used
as the prefix. (This form of resolution unfortunately does not
function for scripts loaded via importScripts().)
4) If none of the above apply, (prefix+path) is returned.
*/
Module['locateFile'] = function(path, prefix) {
return prefix + path;
};
let theFile;
const up = this.urlParams;
if(0){
console.warn("locateFile(",arguments[0], ',', arguments[1],")",
'self.location =',self.location,
'sqlite3InitModuleState.scriptDir =',this.scriptDir,
'up.entries() =',Array.from(up.entries()));
}
if(up.has(path)){
theFile = up.get(path);
}else if(this.sqlite3Dir){
theFile = this.sqlite3Dir + path;
}else if(this.scriptDir){
theFile = this.scriptDir + path;
}else{
theFile = prefix + path;
}
return theFile;
}.bind(sqlite3InitModuleState);
/**
Bug warning: this xInstantiateWasm bit must remain disabled