pop-css

• Overview
• Install
• Quickstart
• Selectors
• Media Queries
• Comments
• Parse CSS
• Minify

Overview

pop-css provides the ability to create new CSS files as well as parse existing ones. There is support for a number of CSS-based features such as media queries, comments and even minification.

pop-css is a component of the Pop PHP Framework.

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Install

Install pop-css using Composer.

composer require popphp/pop-css

Or, require it in your composer.json file

"require": {
    "popphp/pop-css" : "^2.0.1"
}

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Quickstart

In creating CSS, you will use the main CSS object and create and add selector, media and comment objects to it to build your CSS.

use Pop\Css\Css;
use Pop\Css\Selector;

$css = new Css();

$html = new Selector('html');
$html->setProperties([
    'margin'           => 0,
    'padding'          => 0,
    'background-color' => '#fff',
    'font-family'      => 'Arial, sans-serif'
]);

$login = new Selector('#login');
$login->setProperty('margin', 0)
    ->setProperty('padding', 0);

$css->addSelectors([$html, $login]);

echo $css;

The above code will produce:

html {
    margin: 0;
    padding: 0;
    background-color: #fff;
    font-family: Arial, sans-serif;
}

#login {
    margin: 0;
    padding: 0;
}

Rendering the CSS can happen a number of ways:

Call the render method

$cssString = $css->render();

Call a string function

echo $css;

Write to file

$css->writeToFile(__DIR__ . '/styles.css');

The main CSS object's constructor is also flexible and other CSS-related objects can be injected into it:

use Pop\Css\Css;
use Pop\Css\Selector;

$html = new Selector('html');
$html->setProperties([
    'margin'           => 0,
    'padding'          => 0,
    'background-color' => '#fff',
    'font-family'      => 'Arial, sans-serif'
]);

$login = new Selector('#login');
$login->setProperty('margin', 0)
    ->setProperty('padding', 0);

$css = new Css($html, $login);

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Selectors

The selector object is the main object in which to define the various selectors and add them to the main CSS object. The selector constructor accepts any valid CSS selector.

use Pop\Css\Css;
use Pop\Css\Selector;

$css = new Css();

// Element selector
$html = new Selector('p');
$html->setProperties([
    'margin'      => 0,
    'padding'     => '3px',
    'color'       => '#555',
    'font-family' => 'Arial, sans-serif'
]);

// ID selector
$login = new Selector('#login');
$login->setProperty('margin', 0)
    ->setProperty('padding', 0);

// Class selector
$bold = new Selector('.bold');
$bold->setProperty('font-weight', 'bold');

$css->addSelectors([$html, $login, $bold]);

echo $css;

The above code will produce:

p {
    margin: 0;
    padding: 3px;
    color: #555;
    font-family: Arial, sans-serif;
}

#login {
    margin: 0;
    padding: 0;
}

.bold {
    font-weight: bold;
}

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Media Queries

Media queries can be created as separate objects that contain their own selector objects. They are then added to the main CSS object.

use Pop\Css\Css;
use Pop\Css\Selector;
use Pop\Css\Media;

$css = new Css();

$html = new Selector('html');
$html->setProperties([
    'margin'  => 0,
    'padding' => 0,
    'background-color' => '#fff',
    'font-family' => 'Arial, sans-serif'
]);

$login = new Selector('#login');
$login->setProperty('margin', 0);
$login->setProperty('padding', 0);
$login->setProperty('width', '50%');

$p = new Selector('p');
$p->setProperty('margin', 0);
$p->setProperty('padding', 0);
$p->setProperty('width', '50%');

$media = new Media('screen');
$media->setFeature('max-width', '480px');
$media['#login'] = new Selector();
$media['#login']->setProperty('width', '75%');
$media['p'] = new Selector();
$media['p']->setProperty('width', '75%');

$css->addSelectors([$html, $login, $p])
    ->addMedia($media);

echo $css;

The above code will produce:

html {
    margin: 0;
    padding: 0;
    background-color: #fff;
    font-family: Arial, sans-serif;
}

p {
    margin: 0;
    padding: 0;
    width: 50%;
}

#login {
    margin: 0;
    padding: 0;
    width: 50%;
}

@media screen and (max-width: 480px) {
    p {
        width: 75%;
    }
    
    #login {
        width: 75%;
    }
}

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Comments

Comments can be added in a number of places. They can be added to the top of the main CSS content, to the top of a selector or to the top of a media query.

use Pop\Css\Css;
use Pop\Css\Selector;
use Pop\Css\Media;

$css = new Css();
$css->addComment('This is a global comment');

$html = new Selector('html');
$html->setProperties([
    'margin'  => 0,
    'padding' => 0,
    'background-color' => '#fff',
    'font-family' => 'Arial, sans-serif'
]);

$p = new Selector('p');
$p->setProperty('margin', 0);
$p->setProperty('padding', 0);
$p->setProperty('width', '50%');
$p->addComment('This is a comment for the P selector');

$media = new Media('screen');
$media->setFeature('max-width', '480px');
$media['html'] = new Selector();
$media['html']->setProperty('padding', '1%');
$media['html']->addComment('This is a comment for the HTML selector in the media query');
$media->addComment('This is a comment for the media query');

$css->addSelectors([$html, $p])
    ->addMedia($media);

echo $css;

The above code will produce:

/*
 * This is a global comment
 */
html {
    margin: 0;
    padding: 0;
    background-color: #fff;
    font-family: Arial, sans-serif;
}

/*
 * This is a comment for the P selector
 */
p {
    margin: 0;
    padding: 0;
    width: 50%;
}

/*
 * This is a comment for the media query
 */
@media screen and (max-width: 480px) {
    /*
     * This is a comment for the HTML selector in the media query
     */
    html {
        padding: 1%;
    }
}

Comments can be tailored with the $wrap and $trailingNewLine properties that can be passed into the comment constructor. If the $wrap is set to 0, it will force a single-line comment.

use Pop\Css\Css;
use Pop\Css\Selector;

$p = new Selector('p');
$p->setProperty('margin', 0);
$p->setProperty('padding', 0);
$p->setProperty('width', '50%');
$p->addComment('This is a comment for the P selector', 0, false);

$css = new Css($p);
echo $css;

The above code will produce:

/* This is a comment for the P selector */
p {
    margin: 0;
    padding: 0;
    width: 50%;
}

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Parse CSS

You can parse CSS with the following methods:

use Pop\Css\Css;

$css = Css::parseFile('path/to/styles.css');

$css = Css::parseString($cssString);

$css = Css::parseUri('http://www.domain.com/css/styles.css');

In each case, it will return a CSS object populated with the related CSS objects from the content of the source.

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Minify

Setting the minify property on the main CSS object will perform a basic minification of the CSS content.

use Pop\Css\Css;
use Pop\Css\Selector;
use Pop\Css\Media;

$css = new Css();
$css->addComment('This is a global comment');

$html = new Selector('html');
$html->setProperties([
    'margin'  => 0,
    'padding' => 0,
    'background-color' => '#fff',
    'font-family' => 'Arial, sans-serif'
]);

$p = new Selector('p');
$p->setProperty('margin', 0);
$p->setProperty('padding', 0);
$p->setProperty('width', '50%');

$media = new Media('screen');
$media->setFeature('max-width', '480px');
$media['html'] = new Selector();
$media['html']->setProperty('padding', '1%');

$css->addSelectors([$html, $p])
    ->addMedia($media);

$css->minify(true);

echo $css;

The above code will produce:

html{margin:0;padding:0;background-color:#fff;font-family:Arial, sans-serif;}p{margin:0;padding:0;width:50%;} @media screen and (max-width: 480px) {html{padding:1%;}}

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