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

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

Suppose I have a comment in my code:

/* 

 :=  | h
 := a | b |


                      
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                  逝去的感伤        
                
              
                            
                2021-02-08 03:05
              
            
            
                                                                       
You can use my SyntaxRange plugin for that.

Either explicitly assign the range, e.g.

:10,20SyntaxInclude bnf


or automatically based on the delimiting patterns:

:call SyntaxRange#Include('<BNF>', '</BNF>', 'bnf')

                                                                        
                                                        
            
            
              
                
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                  后悔当初        
                
              
                            
                2021-02-08 03:09
              
            
            
                                                                       
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:

                                                                        
                                                        
            
            
              
                
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                  清酒与你        
                
              
                            
                2021-02-08 03:14
              
            
            
                                                                       
for many file types vim will use the heredoc names as a clue. For example in php files I'm often creating here docs thus:

<?php 

$my_html = <<<html 
<h1>Solar</h1> 
<p>Is <em>good</em></p> 
html; 

$my_js = <<<javascript 
alert('yeah baby'); 
javascript; 

$my_sql = <<<sql 
SELECT user 
FROM mytable 
WHERE energy = 'solar'; 
sql; 


works beautifully, with only problem being that indentation is problematic (the closing marker cannot have preceding spaces)
                                                                        
                                                        
            
            
              
                
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