How to syntax-highlight a part of file in a different syntax?

Question

I installed bnf.vim (highlights BNF grammar files).

Suppose I have a comment in my code:

/* 

 :=  | h
 := a | b |          


        

Answer 1

My use case was highlighting an inline Lambda function in a CloudFormation template. Using the above-mentioned SyntaxRange plugin, I added this to my .vimrc:

autocmd Syntax * call SyntaxRange#Include('vim: set ft=js:','vim: set ft=js:','javascript')

And then in my template:

  Function:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: myFunction
      Code:
        ZipFile:
          !Sub |
            // vim: set ft=js:

            const aws = require('aws-sdk');
            const aws4 = require('aws4');
            const https = require('https');
            const zlib = require('zlib');

            ...

            // vim: set ft=js:

# vim: set ft=yaml: