mirror of
https://github.com/roc-lang/roc.git
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58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
async function roc_web_platform_run(wasm_filename, callback) {
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const decoder = new TextDecoder();
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let memory_bytes;
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let exit_code;
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function js_display_roc_string(str_bytes, str_len) {
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const utf8_bytes = memory_bytes.subarray(str_bytes, str_bytes + str_len);
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const js_string = decoder.decode(utf8_bytes);
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callback(js_string);
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}
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const importObj = {
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wasi_snapshot_preview1: {
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proc_exit: (code) => {
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if (code !== 0) {
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console.error(`Exited with code ${code}`);
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}
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exit_code = code;
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},
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fd_write: (x) => { console.error(`fd_write not supported: ${x}`); }
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},
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env: {
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js_display_roc_string,
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roc_panic: (_pointer, _tag_id) => {
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throw "Roc panicked!";
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},
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},
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};
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let wasm;
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const response = await fetch(wasm_filename);
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if (WebAssembly.instantiateStreaming) {
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// streaming API has better performance if available
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wasm = await WebAssembly.instantiateStreaming(response, importObj);
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} else {
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const module_bytes = await response.arrayBuffer();
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wasm = await WebAssembly.instantiate(module_bytes, importObj);
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}
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memory_bytes = new Uint8Array(wasm.instance.exports.memory.buffer);
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try {
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wasm.instance.exports._start();
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} catch (e) {
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const is_ok = e.message === "unreachable" && exit_code === 0;
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if (!is_ok) {
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console.error(e);
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}
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}
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}
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if (typeof module !== "undefined") {
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module.exports = {
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roc_web_platform_run,
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};
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}
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