gistfile1.txt

%lex                                                                                                                                                                                     
                                                                                                                                                                                         
%%                                                                                                                                                                                       
                                                                                                                                                                                         
\n+        { process.stdout.write('[ENDLINE(S)]\n'); return 'ENDLINE'; }                                                                                                                 
<<EOF>>    { process.stdout.write('[EOF]'); return 'EOF'; }                                                                                                                              
                                                                                                                                                                                         
(.*?)":"   { process.stdout.write('[KEY]'); return 'KEY'; }                                                                                                                              
\s         { process.stdout.write('[SPACE]'); return 'SPACE'; }                                                                                                                          
[^\Z|\n]+  { process.stdout.write('[VALUE]'); return 'VALUE'; }                                                                                                                          
                                                                                                                                                                                         
/lex                                                                                                                                                                                     
                                                                                                                                                                                         
%%                                                                                                                                                                                       
                                                                                                                                                                                         
start                                                                                                                                                                                    
  : KEY SPACE VALUE ENDLINE                                                                                                                                                              
  | VALUE ENDLINE                                                                                                                                                                        
  | KEY SPACE VALUE EOF                                                                                                                                                                  
  ;  

gistfile2.txt

var input = 'amount: 200 ml   \n' +                                                                                                                                                      
            'size:300\n' +                                                                                                                                                               
            '\n' +                                                                                                                                                                       
            'This is just a comment I made.\n' +                                                                                                                                         
            'temp: 20celsius';                                                                                                                                                           
                                                                                                                                                                                         
var output = [                                                                                                                                                                           
  [                                                                                                                                                                                      
    { key: 'amount', value: '200 ml' },                                                                                                                                                  
    { key: 'size', value: '300 ml' },                                                                                                                                                    
  ],                                                                                                                                                                                     
                                                                                                                                                                                         
  '\n',                                                                                                                                                                                  
  'This is a comment',                                                                                                                                                                   
  '\n',                                                                                                                                                                                  
                                                                                                                                                                                         
  [                                                                                                                                                                                      
    { key: 'temp', value: '20celsius' },                                                                                                                                                 
  ],                                                                                                                                                                                     
];