├── .gitignore ├── .travis.yml ├── LICENSE ├── README.md ├── composer.json ├── phpunit.xml ├── src ├── CssTreeShaking.php └── ShakingInterface.php └── tests └── ShackingTest.php /.gitignore: -------------------------------------------------------------------------------- 1 | .idea 2 | vendor 3 | composer.lock 4 | clover.xml 5 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: php 2 | 3 | php: 4 | - '7.0' 5 | 6 | before_script: 7 | - composer install 8 | 9 | script: ./vendor/bin/phpunit 10 | 11 | after_success: 12 | - bash <(curl -s https://codecov.io/bash) 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. This 15 | General Public License applies to most of the Free Software 16 | Foundation's software and to any other program whose authors commit to 17 | using it. (Some other Free Software Foundation software is covered by 18 | the GNU Lesser General Public License instead.) You can apply it to 19 | your programs, too. 20 | 21 | When we speak of free software, we are referring to freedom, not 22 | price. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | 294 | Copyright (C) 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | , 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | CSS Tree Shaking 2 | ================ 3 | 4 | [![Build Status](https://travis-ci.org/Drupal-Jedi/css-tree-shaking.svg?branch=master)](https://travis-ci.org/Drupal-Jedi/css-tree-shaking) [![codecov](https://codecov.io/gh/Drupal-Jedi/css-tree-shaking/branch/master/graph/badge.svg)](https://codecov.io/gh/Drupal-Jedi/css-tree-shaking) [![Maintainability](https://api.codeclimate.com/v1/badges/f04970e2df024e38b46b/maintainability)](https://codeclimate.com/github/Drupal-Jedi/css-tree-shaking/maintainability) [![Total Downloads](https://poser.pugx.org/drupalJedi/css-tree-shaking/downloads)](https://packagist.org/packages/drupalJedi/css-tree-shaking) 5 | 6 | Helps you to eliminate the portions of CSS you aren't using. Usually should be used to generate AMP pages, where is the fixed limit for maximum styles size. 7 | 8 | Installation 9 | ------------ 10 | 11 | ``` 12 | composer require drupaljedi/css-tree-shaking 13 | ``` 14 | 15 | Usage 16 | ----- 17 | Pretty simple to use, just create the object and shake it :) 18 | ```php 19 | shakeIt(); 27 | ``` 28 | Where `$html` is raw HTML with inliny styles. 29 | 30 | By default, styles will be shaken only if the limit (50kb) is exceeded. 31 | If you want to shake the styles in any case, just call the `shakeIt()` with a `TRUE` argument: 32 | ```php 33 | $optimizedHtml = $cssShaker->shakeIt(TRUE); 34 | ``` 35 | 36 | Features 37 | -------- 38 | 39 | * PSR-4 autoloading compliant structure 40 | * Easy to use to any framework or even a plain php file 41 | -------------------------------------------------------------------------------- /composer.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "drupaljedi/css-tree-shaking", 3 | "description": "Helps you to eliminate the portions of CSS you aren't using. Usually should be used to generate AMP pages, where is the fixed limit for maximum styles size.", 4 | "license": "GPL-2.0-or-later", 5 | "authors": [ 6 | { 7 | "name": "Dmitry Kiselev", 8 | "email": "kiselev.d@i20.biz" 9 | } 10 | ], 11 | "type": "library", 12 | "require": { 13 | "php": ">=7.0", 14 | "ext-dom": "*", 15 | "sabberworm/php-css-parser": "^8.2", 16 | "symfony/css-selector": "^3", 17 | "symfony/dom-crawler": "~3.0|~4.0" 18 | }, 19 | "autoload": { 20 | "psr-4": { 21 | "DrupalJedi\\": "src/" 22 | } 23 | }, 24 | "require-dev": { 25 | "phpunit/phpunit": "^6" 26 | } 27 | } 28 | -------------------------------------------------------------------------------- /phpunit.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | tests 5 | 6 | 7 | 8 | 9 | src 10 | 11 | 12 | 13 | 14 | 15 | 16 | -------------------------------------------------------------------------------- /src/CssTreeShaking.php: -------------------------------------------------------------------------------- 1 | html = new Crawler($html); 60 | $this->stylesLimit = $stylesLimit; 61 | } 62 | 63 | /** 64 | * @inheritDoc 65 | */ 66 | public function shouldBeShacken(): bool { 67 | $totalSize = 0; 68 | 69 | if (!$this->getStyles()) { 70 | $this->extractStyles(); 71 | } 72 | 73 | foreach ($this->getStyles() as $style) { 74 | $totalSize += \strlen($style->nodeValue); 75 | } 76 | 77 | return $totalSize >= $this->stylesLimit; 78 | } 79 | 80 | /** 81 | * @inheritDoc 82 | */ 83 | public function shakeIt(bool $force = FALSE): string { 84 | $this->extractStyles(); 85 | 86 | // No styles found, return the initial HTML. 87 | if (!$this->getStyles()) { 88 | return $this->exportHtml(); 89 | } 90 | 91 | // Styles are fit into the limit. Shaking is not needed. 92 | if (!($this->shouldBeShacken() || $force)) { 93 | return $this->exportHtml(); 94 | } 95 | 96 | foreach ($this->getStyles() as $style) { 97 | $cssParser = new Parser($style->nodeValue); 98 | $parsedCss = $cssParser->parse(); 99 | 100 | $this->processStyles($parsedCss); 101 | 102 | $style->nodeValue = $parsedCss->render(OutputFormat::createCompact()); 103 | } 104 | 105 | return $this->exportHtml(); 106 | } 107 | 108 | /** 109 | * @inheritDoc 110 | */ 111 | public function exportHtml(): string { 112 | /** @var \DOMElement $element */ 113 | $element = $this->html->getNode(0); 114 | $doctype = ''; 115 | 116 | return $doctype . $element->parentNode->saveHTML($element); 117 | } 118 | 119 | /** 120 | * Process css blocks. 121 | * 122 | * @param \Sabberworm\CSS\CSSList\CSSBlockList $parsedCss 123 | * Parsed CSS. 124 | * 125 | * @codeCoverageIgnore 126 | */ 127 | protected function processStyles(CSSBlockList $parsedCss) { 128 | foreach ($parsedCss->getContents() as $content) { 129 | if ($content instanceof CSSBlockList) { 130 | $this->processCssBlockList($content, $parsedCss); 131 | } 132 | elseif ($content instanceof DeclarationBlock) { 133 | $this->processDeclarationBlock($content, $parsedCss); 134 | } 135 | } 136 | } 137 | 138 | /** 139 | * Process list of css blocks. 140 | * 141 | * @param \Sabberworm\CSS\CSSList\CSSBlockList $content 142 | * Parsed CSS for processing. 143 | * @param \Sabberworm\CSS\CSSList\CSSBlockList $parsedCss 144 | * Resulted parsed CSS. 145 | * 146 | * @codeCoverageIgnore 147 | */ 148 | protected function processCssBlockList(CSSBlockList $content, CSSBlockList $parsedCss) { 149 | $this->processStyles($content); 150 | if (!$content->getContents()) { 151 | $parsedCss->remove($content); 152 | } 153 | } 154 | 155 | /** 156 | * Process selectors inside block. 157 | * 158 | * @param \Sabberworm\CSS\RuleSet\DeclarationBlock $block 159 | * CSS block with selectors. 160 | * @param \Sabberworm\CSS\CSSList\CSSBlockList $parsedCss 161 | * Parsed CSS document. 162 | * 163 | * @codeCoverageIgnore 164 | */ 165 | protected function processDeclarationBlock(DeclarationBlock $block, CSSBlockList $parsedCss) { 166 | if (!$block->getRules()) { 167 | $parsedCss->remove($block); 168 | } 169 | 170 | foreach ($block->getSelectors() as $selector) { 171 | $rawSelector = \explode(':', $selector->getSelector())[0]; 172 | 173 | // Delete duplicated classes from selector, ex: ".ex-class.ex-class". 174 | $rawSelector = \preg_replace('/(\.[^\.\ \{\,\:\;]+)\1+/', '$1', $rawSelector); 175 | 176 | // Found a dead css, remove the selector. 177 | if (!$this->html->filter($rawSelector)->count()) { 178 | $block->removeSelector($selector); 179 | } 180 | } 181 | 182 | if (!$block->getSelectors()) { 183 | $parsedCss->remove($block); 184 | } 185 | } 186 | 187 | /** 188 | * @inheritDoc 189 | * 190 | * @codeCoverageIgnore 191 | */ 192 | public function getStyles() { 193 | return $this->styles; 194 | } 195 | 196 | /** 197 | * @inheritDoc 198 | */ 199 | public function extractStyles() { 200 | if (!$this->getStyles()) { 201 | $this->html->filter('style:not([amp-boilerplate])')->each(function ($style) { 202 | /** @var \Symfony\Component\DomCrawler\Crawler $style */ 203 | $node = $style->getNode(0); 204 | if ($node->nodeValue) { 205 | $this->styles[] = $node; 206 | } 207 | }); 208 | } 209 | } 210 | 211 | } 212 | -------------------------------------------------------------------------------- /src/ShakingInterface.php: -------------------------------------------------------------------------------- 1 | assertSame($expected, $shaker->shouldBeShacken()); 28 | } 29 | 30 | /** 31 | * Testing, that styles can be extracted from html. 32 | * 33 | * @dataProvider getExtractStylesData 34 | * @covers \DrupalJedi\CssTreeShaking::extractStyles 35 | * 36 | * @param string $source 37 | * Source HTML. 38 | * @param bool $expected 39 | * Expected test result for current source. 40 | */ 41 | public function testExtractStyles(string $source, bool $expected) { 42 | 43 | $shaker = new CssTreeShaking($source); 44 | $shaker->extractStyles(); 45 | 46 | $styles = $shaker->getStyles(); 47 | 48 | $this->assertSame($expected, (bool) $styles); 49 | } 50 | 51 | /** 52 | * Testing, that styles shaked successfuly. 53 | * 54 | * @dataProvider getShakeItData 55 | * @covers \DrupalJedi\CssTreeShaking::shakeIt 56 | * 57 | * @param string $source 58 | * Source HTML. 59 | * @param string $expectedStyles 60 | * Expected styles, that should be kept. 61 | * @param bool $force 62 | * Use force mode or not. 63 | */ 64 | public function testShakeIt(string $source, string $expectedStyles, bool $force) { 65 | $shaker = new CssTreeShaking($source); 66 | $shaker->shakeIt($force); 67 | $styles = ''; 68 | 69 | foreach ($shaker->getStyles() as $style) { 70 | $styles .= $style->nodeValue; 71 | } 72 | 73 | $this->assertSame($expectedStyles, $styles); 74 | } 75 | 76 | /** 77 | * Testing, that HTML can be exported. 78 | * 79 | * @dataProvider getExportHtmlData 80 | * @covers \DrupalJedi\CssTreeShaking::exportHtml 81 | * 82 | * @param string $source 83 | * Source HTML. 84 | * @param string $expectedHTML 85 | * Expected styles, that should be kept. 86 | */ 87 | public function testExportHtml(string $source, string $expectedHTML) { 88 | $shaker = new CssTreeShaking($source); 89 | 90 | $this->assertSame($expectedHTML, $shaker->exportHtml()); 91 | } 92 | 93 | /** 94 | * Provide dummy html pages for testing. 95 | * 96 | * @return array 97 | * Dummy HTML pages for shaking. 98 | */ 99 | public function getShakeItData(): array { 100 | return [ 101 | [ 102 | '', 103 | 'body{display:inline-block;}', 104 | TRUE, 105 | ], 106 | [ 107 | '', 108 | '', 109 | TRUE, 110 | ], 111 | [ 112 | '', 113 | '', 114 | TRUE, 115 | ], 116 | [ 117 | '', 118 | '', 119 | TRUE, 120 | ], 121 | [ 122 | '', 123 | 'body{display:inline-block;}', 124 | TRUE, 125 | ], 126 | [ 127 | '', 128 | '.missed-class{color:red;}body{display:inline-block;}', 129 | FALSE, 130 | ], 131 | [ 132 | '', 133 | 'body{display:inline-block;}.missed-class{color:red;}', 134 | FALSE, 135 | ], 136 | [ 137 | '
', 138 | 'body{display:inline-block;}#num1{color:red;}', 139 | TRUE, 140 | ], 141 | [ 142 | '
', 143 | 'body{display:inline-block;}#num1{color:red;}', 144 | TRUE, 145 | ], 146 | [ 147 | '
', 148 | '', 149 | TRUE, 150 | ], 151 | [ 152 | '
', 153 | '@media screen and (max-width: 1000px){body{color:green;}}', 154 | TRUE, 155 | ], 156 | [ 157 | '
', 158 | 'body{color:green;}', 159 | TRUE, 160 | ], 161 | [ 162 | '
', 163 | '', 164 | TRUE, 165 | ], 166 | [ 167 | '
', 168 | '@keyframes anim1{from{opacity:0;}to{opacity:.5;}}@media (min-width: 600px){@keyframes anim1{from{opacity:.5;}to{opacity:1;}}}', 169 | TRUE, 170 | ], 171 | [ 172 | '
', 173 | '', 174 | TRUE, 175 | ], 176 | [ 177 | '
test
', 178 | '@media screen and ( max-width: 640px ){div > span{font-style:normal;}}', 179 | TRUE, 180 | ], 181 | [ 182 | '
test
', 183 | '@media screen and ( max-width: 640px ){@keyframes anim1{from{opacity:0;}to{opacity:.5;}}}', 184 | TRUE, 185 | ], 186 | [ 187 | '
', 188 | '@supports (--a:0){.post table .cell::after{color:red;}}', 189 | TRUE, 190 | ], 191 | [ 192 | '
', 193 | '', 194 | TRUE, 195 | ], 196 | [ 197 | '
', 198 | '', 199 | TRUE, 200 | ] 201 | ]; 202 | } 203 | 204 | /** 205 | * Provide dummy html pages for testing. 206 | * 207 | * @return array 208 | * Dummy HTML pages for extracting. 209 | */ 210 | public function getExtractStylesData(): array { 211 | return [ 212 | [ 213 | '', 214 | FALSE 215 | ], 216 | [ 217 | '', 218 | FALSE 219 | ], 220 | [ 221 | '', 222 | FALSE 223 | ], 224 | [ 225 | '', 226 | TRUE 227 | ], 228 | ]; 229 | } 230 | 231 | /** 232 | * Provide dummy html pages for testing. 233 | * 234 | * @return array 235 | * Dummy HTML pages for checking. 236 | */ 237 | public function getShouldBeShackenData(): array { 238 | return [ 239 | [ 240 | '', 241 | 50000, 242 | FALSE, 243 | ], 244 | [ 245 | '', 246 | 50000, 247 | TRUE, 248 | ], 249 | [ 250 | '', 251 | 100, 252 | TRUE 253 | ], 254 | ]; 255 | } 256 | 257 | /** 258 | * Provide dummy html pages for testing. 259 | * 260 | * @return array 261 | * Dummy HTML pages for checking. 262 | */ 263 | public function getExportHtmlData(): array { 264 | return [ 265 | [ 266 | '', 267 | ' 268 | 269 | 270 | ' 271 | ], 272 | [ 273 | '', 274 | ' 275 | 276 | 277 | 278 | ', 279 | ], 280 | [ 281 | '', 282 | ' 283 | 284 | 285 | 286 | ', 287 | ], 288 | ]; 289 | } 290 | 291 | } 292 | --------------------------------------------------------------------------------