[v5] batch-style still has a text limit of 5000 chars

[songkeys]

There is still a text limit in batch-style RPC mode from v5.

If the character length exceeds 5000 characters, an error will occur:

TypeError: Cannot read property '1' of null
Url: https://translate.google.com/_/TranslateWebserverUi/data/batchexecute?rpcids=MkEWBc&f.sid=3349740657455987534&bl=boq_translate-webserver_20210128.12_p0&hl=en-US&soc-app=1&soc-platform=1&soc-device=1&_reqid=9513&rt=c
    at ....../node_modules/@vitalets/google-translate-api/index.js:90:21
    at processTicksAndRejections (internal/process/task_queues.js:93:5) {
  code: 'BAD_NETWORK'
}

It happens with this line:

google-translate-api/index.js

Line 90 in bba1605

if (json[1][0][0][5] === undefined) {

[vitalets]

It seems this is a restriction of Google translation API itself.
Could you try splitting text by chunks as suggested in #20?

[songkeys]

Yes. Splitting text does solve the problem. The previous implementation allows only around 3000 characters. And the new one is 5000, which is also the one of web version. Seems reasonable.
I take it this new batch-style just adds up another 2000 of limit? Is there any other difference?

[vitalets]

@songkeys I think we can only check differences on practice. As I didn't find any docs on this RPC API and current implementation was reverse engIneered in this article.

Anyway, I've added note about maximum text length to readme. Thanks!

[vkedwardli]

In the website, there is a pagination system splitting each 5000 chars

"5,000 character limit. Use the arrows to translate more"

I think this is the hard limit.