symfony every block with spaceless - php

Question

How i can wrap every block code with spaceless to crop whitespaces from my twig/html
for example now i have:
{% block content %}
<div class="box clearfix clearall">
<div class="ct colcontainer">
<div class="col-1">
<div class="chars">
<table class="layout data-char">
<thead>
blabla
{% endblock %}
And when symfony try to render it, i want that symfony saw
{% block content %}
{% spaceless %}
<div class="box clearfix clearall">
<div class="ct colcontainer">
<div class="col-1">
<div class="chars">
<table class="layout data-char">
<thead>
blabla
{% endspaceless %}
{% endblock %}

Answer 1

Define a custom Twig tag (the copy-and-paste way)
You can define a custom Twig tag spacelessblock which combines block and spaceless. Then you can use {% spacelessblock xyz %}…{% endspacelessblock %} in your templates. Here is how you do it the quick and dirty (copy and paste) way.
A new Twig node
First, define a class Twig_Node_SpacelessBlock (e.g. in the Extension directory of your bundle):
class Twig_Node_SpacelessBlock extends \Twig_Node_Block
{
public function __construct($name, Twig_NodeInterface $body, $lineno, $tag = null)
{
parent::__construct(array('body' => $body), array('name' => $name), $lineno, $tag);
}
public function compile(Twig_Compiler $compiler)
{
// top part of Block.compile
$compiler
->addDebugInfo($this)
->write(sprintf("public function block_%s(\$context, array \$blocks = array())\n", $this->getAttribute('name')), "{\n")
->indent()
;
// the content of the body is treated like in Spaceless.compile
$compiler
->write("ob_start();\n")
->subcompile($this->getNode('body'))
->write("echo trim(preg_replace('/>\s+</', '><', ob_get_clean()));\n")
;
// bottom part of Block.compile
$compiler
->outdent()
->write("}\n\n")
;
}
}
A new Twig token parser
Our new Twig node needs to be built somewhere whenever Twig finds a {% spacelessblock xyz %} in a template. For that, we need a token parser which we call Twig_TokenParser_SpacelessBlock. We basically copy and paste Twig_TokenParser_Block:
class Twig_TokenParser_SpacelessBlock extends \Twig_TokenParser
{
public function parse(Twig_Token $token)
{
// …
$this->parser->setBlock($name, $block = new Twig_Node_SpacelessBlock($name, new Twig_Node(array()), $lineno));
// …
}
public function decideBlockEnd(Twig_Token $token)
{
return $token->test('endspacelessblock');
}
public function getTag()
{
return 'spacelessblock';
}
}
Tell Twig about it
In your extension class:
class Extension extends \Twig_Extension
{
public function getTokenParsers()
{
return array(
new Twig_TokenParser_SpacelessBlock(),
);
}
}
Tell Symfony about it
If not already done, add the following to your your services.yml:
services:
# …
my.extension:
class: Acme\MyBundle\Extension\Extension
tags:
- { name: twig.extension }
Better alternatives
Preprocessor
A better way would be to use a preprocessor to simply replace
{% spacelessblock xyz %}
…
{% endspacelessblock %}
by
{% block xyz %}{% spaceless %}
…
{% endspaceless %}{% endblock %}
which reuses all the code that already has been written in the Twig project, including possible changes.