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HTML

              
                <!-- Put your template between the section tags! Normally Vash uses script tags
with type="text/vash", but codepen doesn't like those... -->
<section id="entry" type="text/vash">
  <p>Vash knows that vash@planetgunsmoke.com is an email
    address and not an expression.</p>
  
  <p>Here is a list of characters:</p>
  <ul>
    @model.somearr.forEach(function(name){ <li>@name</li> })
  </ul>
  
  <h@model.heading>Tags can be programmatic</h@model.heading>
  
  
  @function img(src, alt){
    <img width="300" src="@src" alt="@alt" title="@alt" />
  }
  <p>Macros are totally cool too!</p>
  <p>@img('https://24.media.tumblr.com/tumblr_m42ox3jXDQ1rulyf2o1_500.jpg', 'The $$60 Humanoid Typhoon')</p>

</section>

<!-- put json here to populate the "model" -->
<section id="model-json">
{ 
  "what": "odel says",
  "heading": 5,
  "somearr": ["Vash", "Meryll", "Milly", "Wolfwood"]
}
</section>

<!-- ignore below, these are just for output -->
<section id="lexer-tokens">
  <h1>Lexer Tokens</h1><pre></pre>
</section>
<section id="parse-tree">
  <h1>Parse Tree</h1><pre></pre>
</section>
<section id="output">
  <h1>Output</h1><div></div>
</section>
<section id="tpl-tostring">
  <h1>Template Decompiled</h1><pre></pre>
</section>
              
            
!

CSS

              
                * { font-size: 0.9em; }
section { float: left; min-width: 350px; overflow: hidden; }

#output { float: right; }
.error { padding: 5px; background-color: #B90606; color: white; }

#tpl-tostring { clear: both; }

#entry, #model-json { display: none; }
              
            
!

JS

              
                vash.config.debug = false;

var input = $('#entry').html()

//////////////////////////////////////////////////
// Shortcuts
var htmlesc = function(str){ return vash.helpers.escape(str).toString(); }
    ,lineesc = function( input ){ return input.replace('\n', '\\n') }
    
//////////////////////////////////////////////////
// Show tokens via lexer
var l = new vash.VLexer( input )
    ,tok
    ,tokens = []

while( (tok = l.advance()) ) { tokens.push( tok ); }
var escaped = tokens.map(function(tok){ return htmlesc( lineesc(tok.toString()) ); });
$('#lexer-tokens pre').html( escaped.join('\n') );

//////////////////////////////////////////////////
// use token in parser, and show parse tree
var  p = new vash.VParser( tokens.reverse(), vash.config )

try {
  var ast = p.parse();
} catch(e) {
  $('#entry').before( '<pre class="error">' + htmlesc( e.message ) + '</pre>' );
}

var c = new vash.VCompiler( ast, input );

$('#parse-tree pre').html( htmlesc( ast.toTreeString() ) );

//////////////////////////////////////////////////
// Show output using #model-json
try {
  var tpl = vash.compile( input )
  $('#tpl-tostring pre').html( htmlesc(tpl.toString()) );
  var output = tpl( JSON.parse( $('#model-json').html() ) || {} );
  
  $('#output div').html( output.toString() );
} catch(e){
  $('#entry').before( '<pre class="error">' + htmlesc( e.message ) + '</pre>' );
}


              
            
!
999px

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