Incremental Lexical analysis for custom language plugin

Hello,

I am building a custom language plugin. The lexer for the language is already implemented, unfortunately, it does not have an interface that Idea expects (in Lexer.java). I wanted to know specifically about the incremental relexing requirement (for syntax highlighting).

• If we are hand writing the lexer, do we have to incorporate specific incremental lexing algorithms, in order to keep relexing times low? What is peoples' experience here?

thanks
Siddharth