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| 1 | +# await: *await*, loading |
| 2 | + |
| 3 | +require 'await' |
| 4 | + |
| 5 | +class RubyEngine |
| 6 | + class CRubyWASI < RubyEngine |
| 7 | + REQUIRED_SCRIPTS = [ |
| 8 | + { |
| 9 | + src: "https://cdn.jsdelivr.net/npm/ruby-head-wasm-wasi@0.5.0/dist/index.umd.js", |
| 10 | + integrity: "sha256-EVJ2qiXD74E5qZpFm9MMNqOf5Buo+P2VQKiqOzOKGpg=", |
| 11 | + crossorigin: "anonymous" |
| 12 | + }, |
| 13 | + { |
| 14 | + src: "https://cdn.jsdelivr.net/npm/@wasmer/wasmfs@0.12.0/lib/index.iife.js", |
| 15 | + integrity: "sha256-sOd4ekxVsN4PXhR+cn/4uNAxeQOJRcsaW5qalYfvkTw=", |
| 16 | + crossorigin: "anonymous" |
| 17 | + }, |
| 18 | + { |
| 19 | + src: "https://cdn.jsdelivr.net/npm/@wasmer/wasi@0.12.0/lib/index.iife.js", |
| 20 | + integrity: "sha256-FslFp/Vq4bDf2GXu+9QyBEDLtEWO3fkMjpyOaJMHJT8=", |
| 21 | + crossorigin: "anonymous" |
| 22 | + } |
| 23 | + ] |
| 24 | + |
| 25 | + def initialize(ruby_wasm_url, version) |
| 26 | + @ruby_wasm_url = ruby_wasm_url |
| 27 | + @version = version |
| 28 | + end |
| 29 | + |
| 30 | + def name |
| 31 | + "CRuby #{@version}" |
| 32 | + end |
| 33 | + |
| 34 | + def engine_id |
| 35 | + "cruby-#{@version}" |
| 36 | + end |
| 37 | + |
| 38 | + # Below functions will be compiled as async functions |
| 39 | + def self.inject_scripts |
| 40 | + @injected ||= begin |
| 41 | + REQUIRED_SCRIPTS.map do |script| |
| 42 | + promise = PromiseV2.new |
| 43 | + script = $document.create_element("script", attrs: script) |
| 44 | + script.on("load") { promise.resolve } |
| 45 | + script.on("error") { promise.reject(StandardError.new("failed to load #{script[:src]}")) } |
| 46 | + $document.head << script |
| 47 | + promise |
| 48 | + end.each_await(&:itself) |
| 49 | + true |
| 50 | + end |
| 51 | + end |
| 52 | + |
| 53 | + def wasm_module |
| 54 | + @module ||= begin |
| 55 | + response = `fetch(#{@ruby_wasm_url})`.await |
| 56 | + buffer = `response.arrayBuffer()`.await |
| 57 | + `WebAssembly.compile(buffer)`.await |
| 58 | + end |
| 59 | + end |
| 60 | + |
| 61 | + def run(source) |
| 62 | + `var $WASI, $WasmFs, $RubyVM` |
| 63 | + wasmInstance, wasmModule, vm, wasi, imports = nil |
| 64 | + |
| 65 | + loading("downloading scripts") { CRubyWASI.inject_scripts.await } |
| 66 | + |
| 67 | + loading("early load") do |
| 68 | + `$WASI = window["WASI"].WASI` |
| 69 | + `$WasmFs = window["WasmFs"].WasmFs` |
| 70 | + `$RubyVM = window["ruby-wasm-wasi"].RubyVM` |
| 71 | + |
| 72 | + wasmFs = `new $WasmFs()` |
| 73 | + originalWriteSync = `wasmFs.fs.writeSync.bind(wasmFs.fs)` |
| 74 | + textDecoder = `new TextDecoder("utf-8")` |
| 75 | + %x{ |
| 76 | + wasmFs.fs.writeSync = (fd, buffer, offset, length, position) => { |
| 77 | + const text = textDecoder.decode(buffer); |
| 78 | + if (fd == 1 || fd == 2) { |
| 79 | + #{@writer.print_to_output(`text`, "")}; |
| 80 | + } |
| 81 | + return originalWriteSync(fd, buffer, offset, length, position); |
| 82 | + }; |
| 83 | + } |
| 84 | + |
| 85 | + vm = `new $RubyVM()` |
| 86 | + wasi = `new $WASI({ |
| 87 | + bindings: { ...$WASI.defaultBindings, fs: wasmFs.fs }, |
| 88 | + })` |
| 89 | + imports = `{ wasi_snapshot_preview1: wasi.wasiImport }` |
| 90 | + `vm.addToImports(imports)` |
| 91 | + end |
| 92 | + |
| 93 | + loading("downloading ruby") do |
| 94 | + wasmModule = wasm_module.await |
| 95 | + end |
| 96 | + |
| 97 | + loading("instantiating") do |
| 98 | + wasmInstance = `WebAssembly.instantiate(wasmModule, imports)`.await |
| 99 | + end |
| 100 | + |
| 101 | + loading("initializing") do await |
| 102 | + `vm.setInstance(wasmInstance)`.await |
| 103 | + `wasi.setMemory(wasmInstance.exports.memory)` |
| 104 | + `vm.initialize()` |
| 105 | + end |
| 106 | + |
| 107 | + yield `vm.eval(source).toString()` |
| 108 | + rescue JS::Error => err |
| 109 | + @writer.log_error(err) |
| 110 | + end |
| 111 | + end |
| 112 | +end |
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