[experiments/rust/wasm] Add a WASM test page.

As soon as `esbuild` supports `new URL(…, import.meta.url)`
(evanw/esbuild#795), I want to include a tiny
bit of Rust WASM in the published library to see how much of the
ecosystem can handle it.

rome.json

@@ -22,7 +22,8 @@
       "./src/cubing/search/search-worker-inside-generated-string.js",
       "./src/cubing/vendor/gpl/cs0x7f/**/*",
       "./src/cubing/vendor/mpl/twsearch/*.js",
-      "./src/cubing/vendor/mpl/xyzzy/*.js"
+      "./src/cubing/vendor/mpl/xyzzy/*.js",
+      "./src/sites/experiments.cubing.net/cubing.js/rust/wasm/*.js"
     ]
   },
   "formatter": {
@@ -32,7 +33,8 @@
       "./src/cubing/search/search-worker-inside-generated-string.js",
       "./src/cubing/vendor/gpl/cs0x7f/**/*",
       "./src/cubing/vendor/mpl/twsearch/*.js",
-      "./src/cubing/vendor/mpl/xyzzy/*.js"
+      "./src/cubing/vendor/mpl/xyzzy/*.js",
+      "./src/sites/experiments.cubing.net/cubing.js/rust/wasm/*.js"
     ]
   }
 }

src/sites/experiments.cubing.net/cubing.js/index.html

@@ -162,6 +162,7 @@ <h2>Dev Apps & Demos</h2>
       🖼
       <a href="./svg-state-editor/">svg-state-editor</a>
     </div>
+    <div>🦀 <a href="./rust/wasm/">rust/wasm</a></div>
     <div>📃 <a href="./stub/">stub</a></div>
     <hr>
     <div>

src/sites/experiments.cubing.net/cubing.js/rust/wasm/.htaccess

@@ -0,0 +1,2 @@
+# Dreamhost 🤨
+AddType application/wasm .wasm

src/sites/experiments.cubing.net/cubing.js/rust/wasm/hello_wasm.d.ts

@@ -0,0 +1,47 @@
+/* tslint:disable */
+/* eslint-disable */
+/**
+*/
+export function greet(): void;
+/**
+*/
+export function internal_init(): void;
+/**
+* @param {string} alg_str
+* @returns {string}
+*/
+export function invert_alg(alg_str: string): string;
+
+export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
+
+export interface InitOutput {
+  readonly memory: WebAssembly.Memory;
+  readonly invert_alg: (a: number, b: number, c: number) => void;
+  readonly greet: () => void;
+  readonly internal_init: () => void;
+  readonly __wbindgen_add_to_stack_pointer: (a: number) => number;
+  readonly __wbindgen_malloc: (a: number) => number;
+  readonly __wbindgen_realloc: (a: number, b: number, c: number) => number;
+  readonly __wbindgen_free: (a: number, b: number) => void;
+}
+
+export type SyncInitInput = BufferSource | WebAssembly.Module;
+/**
+* Instantiates the given `module`, which can either be bytes or
+* a precompiled `WebAssembly.Module`.
+*
+* @param {SyncInitInput} module
+*
+* @returns {InitOutput}
+*/
+export function initSync(module: SyncInitInput): InitOutput;
+
+/**
+* If `module_or_path` is {RequestInfo} or {URL}, makes a request and
+* for everything else, calls `WebAssembly.instantiate` directly.
+*
+* @param {InitInput | Promise<InitInput>} module_or_path
+*
+* @returns {Promise<InitOutput>}
+*/
+export default function init (module_or_path?: InitInput | Promise<InitInput>): Promise<InitOutput>;

src/sites/experiments.cubing.net/cubing.js/rust/wasm/hello_wasm.js

@@ -0,0 +1,273 @@
+// Mangled so that bundlers don't try to inline the source.
+const node_fs_promises_mangled = "node:-fs/pr-omises";
+const node_fs_promises_unmangled = () => node_fs_promises_mangled.replace(/-/g, "");
+
+let wasm;
+
+const cachedTextDecoder = new TextDecoder('utf-8', { ignoreBOM: true, fatal: true });
+
+cachedTextDecoder.decode();
+
+let cachedUint8Memory0 = null;
+
+function getUint8Memory0() {
+    if (cachedUint8Memory0 === null || cachedUint8Memory0.byteLength === 0) {
+        cachedUint8Memory0 = new Uint8Array(wasm.memory.buffer);
+    }
+    return cachedUint8Memory0;
+}
+
+function getStringFromWasm0(ptr, len) {
+    return cachedTextDecoder.decode(getUint8Memory0().subarray(ptr, ptr + len));
+}
+
+const heap = new Array(128).fill(undefined);
+
+heap.push(undefined, null, true, false);
+
+let heap_next = heap.length;
+
+function addHeapObject(obj) {
+    if (heap_next === heap.length) heap.push(heap.length + 1);
+    const idx = heap_next;
+    heap_next = heap[idx];
+
+    heap[idx] = obj;
+    return idx;
+}
+
+function getObject(idx) { return heap[idx]; }
+
+function dropObject(idx) {
+    if (idx < 132) return;
+    heap[idx] = heap_next;
+    heap_next = idx;
+}
+
+function takeObject(idx) {
+    const ret = getObject(idx);
+    dropObject(idx);
+    return ret;
+}
+/**
+*/
+export function greet() {
+    wasm.greet();
+}
+
+/**
+*/
+export function internal_init() {
+    wasm.internal_init();
+}
+
+let WASM_VECTOR_LEN = 0;
+
+const cachedTextEncoder = new TextEncoder('utf-8');
+
+const encodeString = (typeof cachedTextEncoder.encodeInto === 'function'
+    ? function (arg, view) {
+    return cachedTextEncoder.encodeInto(arg, view);
+}
+    : function (arg, view) {
+    const buf = cachedTextEncoder.encode(arg);
+    view.set(buf);
+    return {
+        read: arg.length,
+        written: buf.length
+    };
+});
+
+function passStringToWasm0(arg, malloc, realloc) {
+
+    if (realloc === undefined) {
+        const buf = cachedTextEncoder.encode(arg);
+        const ptr = malloc(buf.length);
+        getUint8Memory0().subarray(ptr, ptr + buf.length).set(buf);
+        WASM_VECTOR_LEN = buf.length;
+        return ptr;
+    }
+
+    let len = arg.length;
+    let ptr = malloc(len);
+
+    const mem = getUint8Memory0();
+
+    let offset = 0;
+
+    for (; offset < len; offset++) {
+        const code = arg.charCodeAt(offset);
+        if (code > 0x7F) break;
+        mem[ptr + offset] = code;
+    }
+
+    if (offset !== len) {
+        if (offset !== 0) {
+            arg = arg.slice(offset);
+        }
+        ptr = realloc(ptr, len, len = offset + arg.length * 3);
+        const view = getUint8Memory0().subarray(ptr + offset, ptr + len);
+        const ret = encodeString(arg, view);
+
+        offset += ret.written;
+    }
+
+    WASM_VECTOR_LEN = offset;
+    return ptr;
+}
+
+let cachedInt32Memory0 = null;
+
+function getInt32Memory0() {
+    if (cachedInt32Memory0 === null || cachedInt32Memory0.byteLength === 0) {
+        cachedInt32Memory0 = new Int32Array(wasm.memory.buffer);
+    }
+    return cachedInt32Memory0;
+}
+/**
+* @param {string} alg_str
+* @returns {string}
+*/
+export function invert_alg(alg_str) {
+    try {
+        const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
+        const ptr0 = passStringToWasm0(alg_str, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len0 = WASM_VECTOR_LEN;
+        wasm.invert_alg(retptr, ptr0, len0);
+        var r0 = getInt32Memory0()[retptr / 4 + 0];
+        var r1 = getInt32Memory0()[retptr / 4 + 1];
+        var r2 = getInt32Memory0()[retptr / 4 + 2];
+        var r3 = getInt32Memory0()[retptr / 4 + 3];
+        var ptr1 = r0;
+        var len1 = r1;
+        if (r3) {
+            ptr1 = 0; len1 = 0;
+            throw takeObject(r2);
+        }
+        return getStringFromWasm0(ptr1, len1);
+    } finally {
+        wasm.__wbindgen_add_to_stack_pointer(16);
+        wasm.__wbindgen_free(ptr1, len1);
+    }
+}
+
+async function load(module, imports) {
+    if (typeof Response === 'function' && module instanceof Response) {
+        if (typeof WebAssembly.instantiateStreaming === 'function') {
+            try {
+                return await WebAssembly.instantiateStreaming(module, imports);
+
+            } catch (e) {
+                if (module.headers.get('Content-Type') != 'application/wasm') {
+                    console.warn("`WebAssembly.instantiateStreaming` failed because your server does not serve wasm with `application/wasm` MIME type. Falling back to `WebAssembly.instantiate` which is slower. Original error:\n", e);
+
+                } else {
+                    throw e;
+                }
+            }
+        }
+
+        const bytes = await module.arrayBuffer();
+        return await WebAssembly.instantiate(bytes, imports);
+
+    } else {
+        const instance = await WebAssembly.instantiate(module, imports);
+
+        if (instance instanceof WebAssembly.Instance) {
+            return { instance, module };
+
+        } else {
+            return instance;
+        }
+    }
+}
+
+function getImports() {
+    const imports = {};
+    imports.wbg = {};
+    imports.wbg.__wbg_alert_8755b7883b6ce0ef = function(arg0, arg1) {
+        alert(getStringFromWasm0(arg0, arg1));
+    };
+    imports.wbg.__wbindgen_string_new = function(arg0, arg1) {
+        const ret = getStringFromWasm0(arg0, arg1);
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_new_abda76e883ba8a5f = function() {
+        const ret = new Error();
+        return addHeapObject(ret);
+    };
+    imports.wbg.__wbg_stack_658279fe44541cf6 = function(arg0, arg1) {
+        const ret = getObject(arg1).stack;
+        const ptr0 = passStringToWasm0(ret, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
+        const len0 = WASM_VECTOR_LEN;
+        getInt32Memory0()[arg0 / 4 + 1] = len0;
+        getInt32Memory0()[arg0 / 4 + 0] = ptr0;
+    };
+    imports.wbg.__wbg_error_f851667af71bcfc6 = function(arg0, arg1) {
+        try {
+            console.error(getStringFromWasm0(arg0, arg1));
+        } finally {
+            wasm.__wbindgen_free(arg0, arg1);
+        }
+    };
+    imports.wbg.__wbindgen_object_drop_ref = function(arg0) {
+        takeObject(arg0);
+    };
+
+    return imports;
+}
+
+function initMemory(imports, maybe_memory) {
+
+}
+
+function finalizeInit(instance, module) {
+    wasm = instance.exports;
+    init.__wbindgen_wasm_module = module;
+    cachedInt32Memory0 = null;
+    cachedUint8Memory0 = null;
+
+
+    return wasm;
+}
+
+function initSync(module) {
+    const imports = getImports();
+
+    initMemory(imports);
+
+    if (!(module instanceof WebAssembly.Module)) {
+        module = new WebAssembly.Module(module);
+    }
+
+    const instance = new WebAssembly.Instance(module, imports);
+
+    return finalizeInit(instance, module);
+}
+
+async function init(input) {
+    if (typeof input === 'undefined') {
+        input = new URL('hello_wasm_bg.wasm', import.meta.url);
+    }
+    const imports = getImports();
+
+    if (typeof input === 'string' || (typeof Request === 'function' && input instanceof Request) || (typeof URL === 'function' && input instanceof URL)) {
+        try {
+            input = await fetch(input);
+        } catch (e) {
+            if (!(e instanceof TypeError)) {
+                throw e;
+            }
+            input = await (await import(node_fs_promises_unmangled())).readFile(input);
+        }
+    }
+
+    initMemory(imports);
+
+    const { instance, module } = await load(await input, imports);
+
+    return finalizeInit(instance, module);
+}
+
+export { initSync }
+export default init;