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if (typeof msgpackr === 'undefined') {
throw new Error(
'msgpackr library not loaded. ' +
'Check that the script tag for msgpackr is present and loads correctly.'
);
}
// Buffer/Window/Tabpage handles come back as msgpack EXT values.
// - Type code: not fixed across builds, so read it from
// nvim_get_api_info()'s types metadata at runtime instead of
// hardcoding it.
// - Payload: itself a variable length msgpack integer,
// so it needs a real unpack call, not a fixed width DataView read.
function registerNvimHandleTypes(types) {
for (const [name, info] of Object.entries(types)) {
msgpackr.addExtension({
type: info.id,
unpack(payload) {
return { __nvimType: name, id: msgpackr.unpack(payload) };
},
pack(value) {
return msgpackr.pack(value.id);
},
});
console.log(`[msgpack] registered Nvim EXT type ${info.id} -> ${name}`);
}
}
const MsgpackCodec = {
encode(value) {
const encoded = msgpackr.pack(value);
const prefix = Array.from(encoded.slice(0, Math.min(encoded.length, 8)))
.map(b => b.toString(16).padStart(2, '0'))
.join(' ');
console.log(`[MsgpackCodec.encode] ${encoded.length} bytes, prefix: ${prefix}`);
return encoded;
},
decodeMultiple(bytes) {
const messages = [];
let consumed = 0;
try {
msgpackr.unpackMultiple(bytes, (value, start, end) => {
messages.push(value);
consumed = end;
});
consumed = bytes.length;
} catch (e) {
if (!isIncompleteDataError(e)) {
console.error('[MsgpackCodec.decodeMultiple] fatal decode error', e, 'consumed so far:', consumed);
throw e;
}
}
return { messages, consumed };
},
};
function isIncompleteDataError(e) {
return /unexpected end|incomplete|out of bounds|out of range/i.test(e?.message || '');
}
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