CssToInlineStyles::inlineCssOnElement() - Code Metrics - Inspection of "Ensure correct ordering of styles" - tijsverkoyen/CssToInlineStyles - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#159)

unknown

created 2016-09-15 23:11 UTC

CssToInlineStyles::inlineCssOnElement() B

↳ Parent: CssToInlineStyles

Complexity

Conditions	6
Paths	13

Size

Total Lines	28
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	28
rs	8.439
c	0
b	0
f	0
cc	6
eloc	16
nc	13
nop	2

<?php

namespace TijsVerkoyen\CssToInlineStyles;

use Symfony\Component\CssSelector\CssSelector;
use Symfony\Component\CssSelector\CssSelectorConverter;
use Symfony\Component\CssSelector\Exception\ExceptionInterface;
use TijsVerkoyen\CssToInlineStyles\Css\Processor;
use TijsVerkoyen\CssToInlineStyles\Css\Property\Processor as PropertyProcessor;
use TijsVerkoyen\CssToInlineStyles\Css\Rule\Rule;

class CssToInlineStyles
{
    private $cssConverter;

    public function __construct()
    {
        if (class_exists('Symfony\Component\CssSelector\CssSelectorConverter')) {
            $this->cssConverter = new CssSelectorConverter();
        }
    }

    /**
     * Will inline the $css into the given $html
     *
     * Remark: if the html contains <style>-tags those will be used, the rules
     * in $css will be appended.
     *
     * @param string $html
     * @param string $css
     * @return string
     */
    public function convert($html, $css = null)
    {
        $document = $this->createDomDocumentFromHtml($html);
        $processor = new Processor();

        // get all styles from the style-tags
        $rules = $processor->getRules(
            $processor->getCssFromStyleTags($html)
        );

        if ($css !== null) {
            $rules = $processor->getRules($css, $rules);
        }

        $document = $this->inline($document, $rules);

        return $this->getHtmlFromDocument($document);
    }

    /**
     * Inle the given properties on an given DOMElement
     *
     * @param \DOMElement             $element
     * @param Css\Property\Property[] $properties
     * @return \DOMElement
     */
    public function inlineCssOnElement(\DOMElement $element, array $properties)
    {
        if (empty($properties)) {
            return $element;
        }

        $cssProperties = array();
        $cssInlineProperties = array();
        $inlineProperties = $this->getInlineStyles($element);

        foreach ($inlineProperties as $property) {
            $cssInlineProperties[$property->getName()] = $property;
        }

        foreach ($properties as $property) {
            if (!isset($cssInlineProperties[$property->getName()])) {
                $cssProperties[$property->getName()] = $property;
            }
        }

        $rules = array();
        foreach (array_merge($cssProperties, $cssInlineProperties) as $property) {
            $rules[] = $property->toString();
        }
        $element->setAttribute('style', implode(' ', $rules));

        return $element;
    }

    /**
     * Get the current inline styles for a given DOMElement
     *
     * @param \DOMElement $element
     * @return Css\Property\Property[]
     */
    public function getInlineStyles(\DOMElement $element)
    {
        $processor = new PropertyProcessor();

        return $processor->convertArrayToObjects(
            $processor->splitIntoSeparateProperties(
                $element->getAttribute('style')
            )
        );
    }

    /**
     * @param string $html
     * @return \DOMDocument
     */
    protected function createDomDocumentFromHtml($html)
    {
        $document = new \DOMDocument('1.0', 'UTF-8');
        $internalErrors = libxml_use_internal_errors(true);
        $document->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
        libxml_use_internal_errors($internalErrors);
        $document->formatOutput = true;

        return $document;
    }

    /**
     * @param \DOMDocument $document
     * @return string
     */
    protected function getHtmlFromDocument(\DOMDocument $document)
    {
        // retrieve the document element
        // we do it this way to preserve the utf-8 encoding
        $htmlElement = $document->documentElement;
        $html = $document->saveHTML($htmlElement);
        $html = trim($html);

        // retrieve the doctype
        $document->removeChild($htmlElement);
        $doctype = $document->saveHTML();
        $doctype = trim($doctype);

        // if it is the html5 doctype convert it to lowercase
        if ($doctype === '<!DOCTYPE html>') {
            $doctype = strtolower($doctype);
        }

        return $doctype."\n".$html;
    }

    /**
     * @param \DOMDocument    $document
     * @param Css\Rule\Rule[] $rules
     * @return \DOMDocument
     */
    protected function inline(\DOMDocument $document, array $rules)
    {
        if (empty($rules)) {
            return $document;
        }

        $xPath = new \DOMXPath($document);
        foreach ($rules as $rule) {
            try {
                if (null !== $this->cssConverter) {
                    $expression = $this->cssConverter->toXPath($rule->getSelector());
                } else {
                    // Compatibility layer for Symfony 2.7 and older
                    $expression = CssSelector::toXPath($rule->getSelector());
                }
            } catch (ExceptionInterface $e) {
                continue;
            }

            $elements = $xPath->query($expression);

            if ($elements === false) {
                continue;
            }

            foreach ($elements as $element) {
                $this->calculatePropertiesToBeApplied($element, $rule->getProperties());
            }
        }

        $elements = $xPath->query('//*[@data-css-to-inline-styles]');

        foreach ($elements as $element) {
            $propertiesToBeApplied = $element->attributes->getNamedItem('data-css-to-inline-styles');
            $element->removeAttribute('data-css-to-inline-styles');

            if ($propertiesToBeApplied !== null) {
                $properties = unserialize(base64_decode($propertiesToBeApplied->value));
                $this->inlineCssOnElement($element, $properties);
            }
        }

        return $document;
    }

    /**
     * Store the calculated values in a temporary data-attribute
     *
     * @param \DOMElement             $element
     * @param Css\Property\Property[] $properties
     * @return \DOMElement
     */
    private function calculatePropertiesToBeApplied(
        \DOMElement $element,
        array $properties
    ) {
        if (empty($properties)) {
            return $element;
        }

        $cssProperties = array();
        $currentStyles = $element->attributes->getNamedItem('data-css-to-inline-styles');

        if ($currentStyles !== null) {
            $currentProperties = unserialize(
                base64_decode(
                    $currentStyles->value
                )
            );

            foreach ($currentProperties as $property) {
                $cssProperties[$property->getName()] = $property;
            }
        }

        foreach ($properties as $property) {
            if (isset($cssProperties[$property->getName()])) {
                $existingProperty = $cssProperties[$property->getName()];

                if (
                    ($existingProperty->isImportant() && $property->isImportant()) &&
                    ($existingProperty->getOriginalSpecificity()->compareTo($property->getOriginalSpecificity()) <= 0)
                ) {
                    // if both the properties are important we should use the specificity
                    $cssProperties[$property->getName()] = $property;
                } elseif (!$existingProperty->isImportant() && $property->isImportant()) {
                    // if the existing property is not important but the new one is, it should be overruled
                    $cssProperties[$property->getName()] = $property;
                } elseif (
                    !$existingProperty->isImportant() &&
                    ($existingProperty->getOriginalSpecificity()->compareTo($property->getOriginalSpecificity()) <= 0)
                ) {
                    // if the existing property is not important we should check the specificity
                    $cssProperties[$property->getName()] = $property;
                }
            } else {
                $cssProperties[$property->getName()] = $property;
            }
        }

        $element->setAttribute(
            'data-css-to-inline-styles',
            base64_encode(
                serialize(
                    array_values($cssProperties)
                )
            )
        );

        return $element;
    }
}


1			<?php
2
3			namespace TijsVerkoyen\CssToInlineStyles;
4
5			use Symfony\Component\CssSelector\CssSelector;
6			use Symfony\Component\CssSelector\CssSelectorConverter;
7			use Symfony\Component\CssSelector\Exception\ExceptionInterface;
8			use TijsVerkoyen\CssToInlineStyles\Css\Processor;
9			use TijsVerkoyen\CssToInlineStyles\Css\Property\Processor as PropertyProcessor;
10			use TijsVerkoyen\CssToInlineStyles\Css\Rule\Rule;
11
12			class CssToInlineStyles
13			{
14			private $cssConverter;
15
16			public function __construct()
17			{
18			if (class_exists('Symfony\Component\CssSelector\CssSelectorConverter')) {
19			$this->cssConverter = new CssSelectorConverter();
20			}
21			}
22
23			/**
24			* Will inline the $css into the given $html
25			*
26			* Remark: if the html contains <style>-tags those will be used, the rules
27			* in $css will be appended.
28			*
29			* @param string $html
30			* @param string $css
31			* @return string
32			*/
33			public function convert($html, $css = null)
34			{
35			$document = $this->createDomDocumentFromHtml($html);
36			$processor = new Processor();
37
38			// get all styles from the style-tags
39			$rules = $processor->getRules(
40			$processor->getCssFromStyleTags($html)
41			);
42
43			if ($css !== null) {
44			$rules = $processor->getRules($css, $rules);
45			}
46
47			$document = $this->inline($document, $rules);
48
49			return $this->getHtmlFromDocument($document);
50			}
51
52			/**
53			* Inle the given properties on an given DOMElement
54			*
55			* @param \DOMElement $element
56			* @param Css\Property\Property[] $properties
57			* @return \DOMElement
58			*/
59			public function inlineCssOnElement(\DOMElement $element, array $properties)
60			{
61			if (empty($properties)) {
62			return $element;
63			}
64
65			$cssProperties = array();
66			$cssInlineProperties = array();
67			$inlineProperties = $this->getInlineStyles($element);
68
69			foreach ($inlineProperties as $property) {
70			$cssInlineProperties[$property->getName()] = $property;
71			}
72
73			foreach ($properties as $property) {
74			if (!isset($cssInlineProperties[$property->getName()])) {
75			$cssProperties[$property->getName()] = $property;
76			}
77			}
78
79			$rules = array();
80			foreach (array_merge($cssProperties, $cssInlineProperties) as $property) {
81			$rules[] = $property->toString();
82			}
83			$element->setAttribute('style', implode(' ', $rules));
84
85			return $element;
86			}
87
88			/**
89			* Get the current inline styles for a given DOMElement
90			*
91			* @param \DOMElement $element
92			* @return Css\Property\Property[]
93			*/
94			public function getInlineStyles(\DOMElement $element)
95			{
96			$processor = new PropertyProcessor();
97
98			return $processor->convertArrayToObjects(
99			$processor->splitIntoSeparateProperties(
100			$element->getAttribute('style')
101			)
102			);
103			}
104
105			/**
106			* @param string $html
107			* @return \DOMDocument
108			*/
109			protected function createDomDocumentFromHtml($html)
110			{
111			$document = new \DOMDocument('1.0', 'UTF-8');
112			$internalErrors = libxml_use_internal_errors(true);
113			$document->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
114			libxml_use_internal_errors($internalErrors);
115			$document->formatOutput = true;
116
117			return $document;
118			}
119
120			/**
121			* @param \DOMDocument $document
122			* @return string
123			*/
124			protected function getHtmlFromDocument(\DOMDocument $document)
125			{
126			// retrieve the document element
127			// we do it this way to preserve the utf-8 encoding
128			$htmlElement = $document->documentElement;
129			$html = $document->saveHTML($htmlElement);
130			$html = trim($html);
131
132			// retrieve the doctype
133			$document->removeChild($htmlElement);
134			$doctype = $document->saveHTML();
135			$doctype = trim($doctype);
136
137			// if it is the html5 doctype convert it to lowercase
138			if ($doctype === '<!DOCTYPE html>') {
139			$doctype = strtolower($doctype);
140			}
141
142			return $doctype."\n".$html;
143			}
144
145			/**
146			* @param \DOMDocument $document
147			* @param Css\Rule\Rule[] $rules
148			* @return \DOMDocument
149			*/
150			protected function inline(\DOMDocument $document, array $rules)
151			{
152			if (empty($rules)) {
153			return $document;
154			}
155
156			$xPath = new \DOMXPath($document);
157			foreach ($rules as $rule) {
158			try {
159			if (null !== $this->cssConverter) {
160			$expression = $this->cssConverter->toXPath($rule->getSelector());
161			} else {
162			// Compatibility layer for Symfony 2.7 and older
163			$expression = CssSelector::toXPath($rule->getSelector());
164			}
165			} catch (ExceptionInterface $e) {
166			continue;
167			}
168
169			$elements = $xPath->query($expression);
170
171			if ($elements === false) {
172			continue;
173			}
174
175			foreach ($elements as $element) {
176			$this->calculatePropertiesToBeApplied($element, $rule->getProperties());
177			}
178			}
179
180			$elements = $xPath->query('//*[@data-css-to-inline-styles]');
181
182			foreach ($elements as $element) {
183			$propertiesToBeApplied = $element->attributes->getNamedItem('data-css-to-inline-styles');
184			$element->removeAttribute('data-css-to-inline-styles');
185
186			if ($propertiesToBeApplied !== null) {
187			$properties = unserialize(base64_decode($propertiesToBeApplied->value));
188			$this->inlineCssOnElement($element, $properties);
189			}
190			}
191
192			return $document;
193			}
194
195			/**
196			* Store the calculated values in a temporary data-attribute
197			*
198			* @param \DOMElement $element
199			* @param Css\Property\Property[] $properties
200			* @return \DOMElement
201			*/
202			private function calculatePropertiesToBeApplied(
203			\DOMElement $element,
204			array $properties
205			) {
206			if (empty($properties)) {
207			return $element;
208			}
209
210			$cssProperties = array();
211			$currentStyles = $element->attributes->getNamedItem('data-css-to-inline-styles');
212
213			if ($currentStyles !== null) {
214			$currentProperties = unserialize(
215			base64_decode(
216			$currentStyles->value
217			)
218			);
219
220			foreach ($currentProperties as $property) {
221			$cssProperties[$property->getName()] = $property;
222			}
223			}
224
225			foreach ($properties as $property) {
226			if (isset($cssProperties[$property->getName()])) {
227			$existingProperty = $cssProperties[$property->getName()];
228
229			if (
230			($existingProperty->isImportant() && $property->isImportant()) &&
231			($existingProperty->getOriginalSpecificity()->compareTo($property->getOriginalSpecificity()) <= 0)
232			) {
233			// if both the properties are important we should use the specificity
234			$cssProperties[$property->getName()] = $property;
235			} elseif (!$existingProperty->isImportant() && $property->isImportant()) {
236			// if the existing property is not important but the new one is, it should be overruled
237			$cssProperties[$property->getName()] = $property;
238			} elseif (
239			!$existingProperty->isImportant() &&
240			($existingProperty->getOriginalSpecificity()->compareTo($property->getOriginalSpecificity()) <= 0)
241			) {
242			// if the existing property is not important we should check the specificity
243			$cssProperties[$property->getName()] = $property;
244			}
245			} else {
246			$cssProperties[$property->getName()] = $property;
247			}
248			}
249
250			$element->setAttribute(
251			'data-css-to-inline-styles',
252			base64_encode(
253			serialize(
254			array_values($cssProperties)
255			)
256			)
257			);
258
259			return $element;
260			}
261			}
262

tijsverkoyen / CssToInlineStyles

Pull Request — master (#159)

CssToInlineStyles::inlineCssOnElement() B

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