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morrelinko/yield-extension.js

Created November 22, 2017 16:29
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Nunjucks 'yield' Extension (One liner block expressions)
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yield-extension.js
'use strict'
class YieldExtension {
get tags () {
return ['yield']
}
parse (parser, nodes, lexer) {
let tag = parser.nextToken()
parser.skipSymbol(tag.value)
let node = new nodes.Block(tag.lineno, tag.colno)
node.name = parser.parsePrimary()
node.body = new nodes.NodeList(0, 0, [new nodes.Output(0, 0, [parser.parsePrimary()])])
parser.advanceAfterBlockEnd(tag.value)
return node
}
}
module.exports = YieldExtension
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morrelinko commented Nov 22, 2017 •
edited
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How to use

Before (using blocks)

<!-- Parent Template -->
<html>
<head>
    <title> 
        {% block title %} 
        {% endblock %}
    </title>
</head>
</html>
<!-- Child template -->

{% block title %}Home Page{% endblock %}

Now (with Yield)

<!-- Parent Template -->
<html>
<head>
    <title> {% yield title '' %} </title>
</head>
</html>
<!-- Child template -->

{% yield title 'Home Page' %}

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