LGLS665 limiting file characters both txt and js

I am making a mod for a game and it has reached over a thousand lines (Right now one big switch statement) my issue is it cuts the file short after a specific amount of characters in the javascript file. Someone said that a javascript file has no limits and it doesnt seem to on my desktop but on my android it limits my file. It cuts the file in the middle of the switch statement and wont let me type or continue. I opened it in every text editor I could find and none of them showed the file or would allow me to edit it. Why is there a limit on my android for text files and js files? What can I do to prevent it?