GoogleFontsOptimizer::hasHtmlTag() - Code Metrics - Inspection of "start pulling stuff out to see how to reduce compl..." - zytzagoo/wp-google-fonts-optimizer - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( e3de86...7a576b )

by zyt

created 2017-10-20 15:42 UTC

GoogleFontsOptimizer::hasHtmlTag() A

↳ Parent: GoogleFontsOptimizer::getFontsArray()

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	1
nc	1
nop	1
dl	0
loc	3
ccs	3
cts	3
cp	1
crap	1
rs	10
c	0
b	0
f	0

<?php

namespace ZWF;

use ZWF\GoogleFontsOptimizerUtils as Utils;

class GoogleFontsOptimizer
{
    const FILTER_MARKUP_TYPE  = 'zwf_gfo_markup_type';
    const DEFAULT_MARKUP_TYPE = 'link'; // Anything else generates the WebFont script loader

    const FILTER_OPERATION_MODE  = 'zwf_gfo_mode';
    const DEFAULT_OPERATION_MODE = 'enqueued_styles_only';

    const FILTER_OB_CLEANER  = 'zwf_gfo_clean_ob';
    const DEFAULT_OB_CLEANER = false;

    protected $candidates = [];

    protected $enqueued = [];

    /**
     * Like the wind.
     * Main entry point when hooked/called from WP action.
     *
     * @return void
     */
    public function run()
    {
        $mode = apply_filters(self::FILTER_OPERATION_MODE, self::DEFAULT_OPERATION_MODE);

        switch ($mode) {
            case 'markup':
                /**
                 * Scan and optimize requests found in the markup (uses more
                 * memory but works on [almost] any theme)
                 */
                add_action('template_redirect', [$this, 'startBuffering'], 11);
                break;

            case self::DEFAULT_OPERATION_MODE:
            default:
                /**
                 * Scan only things added via wp_enqueue_style (uses slightly
                 * less memory usually, but requires a decently coded theme)
                 */
                add_filter('print_styles_array', [$this, 'processStylesHandles']);
                break;
        }
    }

    /**
     * Returns true when an array isn't empty and has enough elements.
     *
     * @param array $candidates
     *
     * @return bool
     */
    protected function hasEnoughElements(array $candidates = [])
    {
        $enough = true;

        if (empty($candidates) || count($candidates) < 2) {
            $enough = false;
        }

        return $enough;
    }

    /**
     * Callback to hook into `wp_print_styles`.
     * It processes enqueued styles and combines any multiple google fonts
     * requests into a single one (and removes the enqueued styles handles
     * and replaces them with a single combined enqueued style request/handle).
     *
     * TODO/FIXME: Investigate how this works out when named deps are used somewhere?
     *
     * @param array $handles
     *
     * @return array
     */
    public function processStylesHandles(array $handles)
    {
        $candidate_handles = $this->findCandidateHandles($handles);

        // Bail if we don't have anything that makes sense for us to continue
        if (! $this->hasEnoughElements($candidate_handles)) {
            return $handles;
        }

        // Set the list of found urls we matched
        $this->setCandidates(array_values($candidate_handles));

        // Get fonts array data from candidates
        $fonts_array = $this->getFontsArray($this->getCandidates());
        if (isset($fonts_array['complete'])) {
            $combined_font_url = Utils::buildGoogleFontsUrlFromFontsArray($fonts_array);
            $handle_name       = 'zwf-gfo-combined';
            $this->enqueueStyle($handle_name, $combined_font_url);
            $handles[] = $handle_name;
        }

        if (isset($fonts_array['partial'])) {
            $cnt = 0;
            foreach ($fonts_array['partial']['url'] as $url) {
                $cnt++;
                $handle_name = 'zwf-gfo-combined-txt-' . $cnt;
                $this->enqueueStyle($handle_name, $url);
                $handles[] = $handle_name;
            }
        }

        // Remove/dequeue the ones we just combined above
        $this->dequeueStyleHandles($candidate_handles);

        // Removes processed handles from originally given $handles
        $handles = array_diff($handles, array_keys($candidate_handles));

        return $handles;
    }

    /**
     * Given a list of WP style handles return a new "named map" of handles
     * we care about along with their urls.
     *
     * TODO/FIXME: See if named deps will need to be taken care of...
     *
     * @codeCoverageIgnore
     *
     * @param array $handles
     *
     * @return array
     */
    public function findCandidateHandles(array $handles)
    {
        $handler           = /** @scrutinizer ignore-call */ \wp_styles();
        $candidate_handles = [];

        foreach ($handles as $handle) {
            $dep = $handler->query($handle, 'registered');
            if ($dep) {
                $url = $dep->src;
                if (Utils::isGoogleWebFontUrl($url)) {
                    $candidate_handles[$handle] = $url;
                }
            }
        }

        return $candidate_handles;
    }

    /**
     * Dequeue given `$handles`.
     *
     * @param array $handles
     *
     * @return void
     */
    public function dequeueStyleHandles(array $handles)
    {
        foreach ($handles as $handle => $url) {
            // @codeCoverageIgnoreStart
            if (function_exists('\wp_deregister_style')) {
                /** @scrutinizer ignore-call */
                \wp_deregister_style($handle);
            }
            if (function_exists('\wp_dequeue_style')) {
                /** @scrutinizer ignore-call */
                \wp_dequeue_style($handle);
            }
            // @codeCoverageIgnoreEnd
            unset($this->enqueued[$handle]);
        }
    }

    /**
     * Enqueues a given style using `\wp_enqueue_style()` and keeps it in
     * our own `$enqueued` list for reference.
     *
     * @param string $handle
     * @param string $url
     * @param array $deps
     * @param string|null $version
     *
     * @return void
     */
    public function enqueueStyle($handle, $url, $deps = [], $version = null)
    {
        // @codeCoverageIgnoreStart
        if (function_exists('\wp_enqueue_style')) {
            /** @scrutinizer ignore-call */
            \wp_enqueue_style($handle, $url, $deps, $version);
        }
        // @codeCoverageIgnoreEnd

        $this->enqueued[$handle] = $url;
    }

    /**
     * Get the entire list of enqueued styles or a specific one if $handle is specified.
     *
     * @param string|null $handle Style "slug"
     *
     * @return array|string
     */
    public function getEnqueued($handle = null)
    {
        $data = $this->enqueued;

        if (null !== $handle && isset($this->enqueued[$handle])) {
            $data = $this->enqueued[$handle];
        }

        return $data;
    }

    /**
     * Callback to invoke in oder to modify google fonts found in the HTML markup.
     * Returns modified markup in which multiple google fonts requests are
     * combined into a single one (if multiple requests are found).
     *
     * @param string $markup
     *
     * @return string
     */
    public function processMarkup($markup)
    {
        $hrefs = $this->parseMarkupForHrefs($markup);
        if (! empty($hrefs)) {
            $this->setCandidates($hrefs);
        }

        // See if we found anything
        $candidates = $this->getCandidates();

        // Bail and return original markup unmodified if we don't have things to do
        if (! $this->hasEnoughElements($candidates)) {
            return $markup;
        }

        // Process what we found and modify original markup with our replacement
        $fonts_array = $this->getFontsArray($candidates);
        $font_markup = $this->buildFontsMarkup($fonts_array);
        $markup      = $this->modifyMarkup($markup, $font_markup, $fonts_array['links']);

        return $markup;
    }

    /**
     * Given a string of $markup, returns an array of hrefs we're interested in.
     *
     * @param string $markup
     *
     * @return array
     */
    protected function parseMarkupForHrefs($markup)
    {
        $dom = new \DOMDocument();
        // @codingStandardsIgnoreLine
        /** @scrutinizer ignore-unhandled */ @$dom->loadHTML($markup);
        // Looking for all <link> elements
        $links = $dom->getElementsByTagName('link');
        $hrefs = $this->filterHrefsFromCandidateLinkNodes($links);

        return $hrefs;
    }

    /**
     * Returns the list of google web fonts stylesheet hrefs found.
     *
     * @param \DOMNodeList $nodes
     *
     * @return array
     */
    protected function filterHrefsFromCandidateLinkNodes(\DOMNodeList $nodes)
    {
        $hrefs = [];

        foreach ($nodes as $node) {
            if ($this->isCandidateLink($node)) {
                $hrefs[] = $node->getAttribute('href');
            }
        }

        return $hrefs;
    }

    /**
     * Returns true if given DOMNode is a stylesheet and points to a Google Web Fonts url.
     *
     * @param \DOMNode $node
     *
     * @return bool
     */
    protected function isCandidateLink(\DOMNode $node)
    {
        $rel  = $node->getAttribute('rel');
        $href = $node->getAttribute('href');

        return ('stylesheet' === $rel && Utils::isGoogleWebFontUrl($href));
    }

    /**
     * Modifies given $markup to include given $font_markup in the <head>.
     * Also removes any existing stylesheets containing the given $font_links (if found).
     *
     * @param string $markup
     * @param string $font_markup
     * @param array $font_links
     *
     * @return string
     */
    public function modifyMarkup($markup, $font_markup, array $font_links)
    {
        $new_markup = $markup;

        // Remove existing stylesheets
        foreach ($font_links as $font_link) {
            $font_link = preg_quote($font_link, '/');

            // Tweak back what DOMDocument replaces sometimes
            $font_link = str_replace('&#038;', '&', $font_link);
            // This adds an extra capturing group in the pattern actually
            $font_link = str_replace('&', '(&|&#038;|&amp;)', $font_link);
            // Match this url's link tag, including optional newlines at the end of the string
            $pattern = '/<link([^>]*?)href[\s]?=[\s]?[\'\"\\\]*' . $font_link . '([^>]*?)>([\s]+)?/is';
            // Now replace
            $new_markup = preg_replace($pattern, '', $new_markup);
        }

        // Adding the font markup to top of <head> for now
        // TODO/FIXME: This could easily break when someone uses `<head>` in HTML comments and such?
        $new_markup = str_ireplace('<head>', '<head>' . $font_markup, trim($new_markup));

        return $new_markup;
    }

    public function startBuffering()
    {
        $started = false;

        if ($this->shouldBuffer()) {
            /**
             * N.B.
             * In theory, others might've already started buffering before us,
             * which can prevent us from getting the markup.
             * If that becomes an issue, we can call shouldCleanOutputBuffers()
             * and cleanOutputBuffers() here before starting our buffering.
             */

            // Start our own buffering
            $started = ob_start([$this, 'endBuffering']);
        }

        return $started;
    }

    public function endBuffering($markup)
    {
        // Bail early on things we don't want to parse
        if (! $this->isMarkupDoable($markup)) {
            return $markup;
        }

        return $this->processMarkup($markup);
    }

    /**
     * Determines whether the current WP request should be buffered.
     *
     * @return bool
     * @codeCoverageIgnore
     */
    protected function shouldBuffer()
    {
        $buffer = true;

        if ($buffer && function_exists('\is_admin') && /** @scrutinizer ignore-call */ is_admin()) {
            $buffer = false;
        }

        if ($buffer && function_exists('\is_feed') && /** @scrutinizer ignore-call */ is_feed()) {
            $buffer = false;
        }

        if ($buffer && defined('\DOING_AJAX')) {
            $buffer = false;
        }

        if ($buffer && defined('\DOING_CRON')) {
            $buffer = false;
        }

        if ($buffer && defined('\WP_CLI')) {
            $buffer = false;
        }

        if ($buffer && defined('\APP_REQUEST')) {
            $buffer = false;
        }

        if ($buffer && defined('\XMLRPC_REQUEST')) {
            $buffer = false;
        }

        if ($buffer && defined('\SHORTINIT') && \SHORTINIT) {

            $buffer = false;
        }

        return $buffer;
    }

    /**
     * @codeCoverageIgnore
     */
    protected function shouldCleanOutputBuffers()
    {
        return apply_filters(self::FILTER_OB_CLEANER, self::DEFAULT_OB_CLEANER);
    }

    /**
     * @codeCoverageIgnore
     */
    protected function cleanOutputBuffers()
    {
        while (ob_get_level() > 0) {
            ob_end_clean();
        }
    }

    /**
     * Returns true if given markup should be processed.
     *
     * @param string $content
     *
     * @return bool
     */
    protected function isMarkupDoable($content)
    {
        $html  = Utils::hasHtmlTag($content);
        $html5 = Utils::hasHtml5Doctype($content);
        $xsl   = Utils::hasXslStylesheet($content);

        return (($html || $html5) && ! $xsl);
    }

    /**
     * @param array $urls
     */
    public function setCandidates(array $urls = [])
    {
        $this->candidates = $urls;
    }

    /**
     * @return array
     */
    public function getCandidates()
    {
        return $this->candidates;
    }

    /**
     * Given a list of google fonts urls it returns another array of data
     * representing found families/sizes/subsets/urls.
     *
     * @param array $candidates
     *
     * @return array
     */
    protected function getFontsArray(array $candidates = [])
    {
        $fonts = [];

        foreach ($candidates as $candidate) {
            $fonts['links'][] = $candidate;

            $params = [];
            parse_str(parse_url($candidate, PHP_URL_QUERY), $params);

            if (isset($params['text'])) {
                // Fonts with character limitations are segregated into
                // under 'partial' (when `text` query param is used)
                $font_family                = explode(':', $params['family']);
                $fonts['partial']['name'][] = $font_family[0];
                $fonts['partial']['url'][]  = Utils::httpsify($candidate);
            } else {
                $fontstrings = $this->buildFontStringsFromQueryParams($params);
                foreach ($fontstrings as $font) {
                    $fonts['complete'][] = $font;
                }
            }
        }

        return $fonts;
    }

    /**
     * Looks for and parses the `family` query string value into a string
     * that Google Fonts expects (family, weights and subsets separated by
     * a semicolon).
     *
     * @param array $params
     *
     * @return array
     */
    protected function buildFontStringsFromQueryParams(array $params)
    {
        $fonts = [];

        foreach (explode('|', $params['family']) as $family) {
            $font = $this->parseFontStringFamilyParam($family, $params);
            if (! empty($font)) {
                $fonts[] = $font;
            }
        }

        return $fonts;
    }

    /**
     * @param string $family
     * @param array $params
     *
     * @return string
     */
    protected function parseFontStringFamilyParam($family, array $params)
    {
        $subset = false;
        $family = explode(':', $family);

        if (isset($params['subset'])) {
            // Use the found subset query parameter
            $subset = $params['subset'];
        } elseif (isset($family[2])) {
            // Use the subset in the family string if present
            $subset = $family[2];
        }

        // $family can have a lot of thing specified with separators etc.
        $parts = $this->buildFontStringParts($family, $subset);
        $font  = implode(':', $parts);

        return $font;
    }

    /**
     * Makes sure we only include what we needValidate and return needed font parts data.
     *
     * @param array $family
     * @param bool $subset
     *
     * @return array
     */
    protected function buildFontStringParts(array $family, $subset = false)
    {
        $parts = [];

        // First part is the font name, which should always be present
        $parts[] = $family[0];

        // Check if sizes are specified
        if (isset($family[1]) && strlen($family[1]) > 0) {
            $parts[] = $family[1];
        }

        // Add the subset if specified
        if ($subset) {
            $parts[] = $subset;
        }

        return $parts;
    }

    /**
     * Given data from `getFontsArray()` builds HTML markup for found google fonts.
     *
     * @param array $fonts_array
     *
     * @return string
     */
    protected function buildFontsMarkup(array $fonts_array)
    {
        $markup_type = apply_filters(self::FILTER_MARKUP_TYPE, self::DEFAULT_MARKUP_TYPE);
        if ('link' === $markup_type) {
            // Build standard link markup
            $markup = Utils::buildFontsMarkupLinks($fonts_array);
        } else {
            // Bulding WebFont script loader
            $markup = Utils::buildFontsMarkupScript($fonts_array);
        }

        return $markup;
    }
}


1		<?php
2
3		namespace ZWF;
4
5		use ZWF\GoogleFontsOptimizerUtils as Utils;
6
7		class GoogleFontsOptimizer
8		{
9		const FILTER_MARKUP_TYPE = 'zwf_gfo_markup_type';
10		const DEFAULT_MARKUP_TYPE = 'link'; // Anything else generates the WebFont script loader
11
12		const FILTER_OPERATION_MODE = 'zwf_gfo_mode';
13		const DEFAULT_OPERATION_MODE = 'enqueued_styles_only';
14
15		const FILTER_OB_CLEANER = 'zwf_gfo_clean_ob';
16		const DEFAULT_OB_CLEANER = false;
17
18		protected $candidates = [];
19
20		protected $enqueued = [];
21
22		/**
23		* Like the wind.
24		* Main entry point when hooked/called from WP action.
25		*
26		* @return void
27		*/
28	3	public function run()
29	3	{
30	3	$mode = apply_filters(self::FILTER_OPERATION_MODE, self::DEFAULT_OPERATION_MODE);
31
32		switch ($mode) {
33	3	case 'markup':
34		/**
35		* Scan and optimize requests found in the markup (uses more
36		* memory but works on [almost] any theme)
37		*/
38	1	add_action('template_redirect', [$this, 'startBuffering'], 11);
39	1	break;
40
41	2	case self::DEFAULT_OPERATION_MODE:
42		default:
43		/**
44		* Scan only things added via wp_enqueue_style (uses slightly
45		* less memory usually, but requires a decently coded theme)
46		*/
47	2	add_filter('print_styles_array', [$this, 'processStylesHandles']);
48	2	break;
49		}
50	3	}
51
52		/**
53		* Returns true when an array isn't empty and has enough elements.
54		*
55		* @param array $candidates
56		*
57		* @return bool
58		*/
59	6	protected function hasEnoughElements(array $candidates = [])
60	6	{
61	6	$enough = true;
62
63	6	if (empty($candidates) \|\| count($candidates) < 2) {
64	2	$enough = false;
65		}
66
67	6	return $enough;
68		}
69
70		/**
71		* Callback to hook into `wp_print_styles`.
72		* It processes enqueued styles and combines any multiple google fonts
73		* requests into a single one (and removes the enqueued styles handles
74		* and replaces them with a single combined enqueued style request/handle).
75		*
76		* TODO/FIXME: Investigate how this works out when named deps are used somewhere?
77		*
78		* @param array $handles
79		*
80		* @return array
81		*/
82	2	public function processStylesHandles(array $handles)
83	2	{
84	2	$candidate_handles = $this->findCandidateHandles($handles);
85
86		// Bail if we don't have anything that makes sense for us to continue
87	2	if (! $this->hasEnoughElements($candidate_handles)) {
88	1	return $handles;
89		}
90
91		// Set the list of found urls we matched
92	1	$this->setCandidates(array_values($candidate_handles));
93
94		// Get fonts array data from candidates
95	1	$fonts_array = $this->getFontsArray($this->getCandidates());
96	1	if (isset($fonts_array['complete'])) {
97	1	$combined_font_url = Utils::buildGoogleFontsUrlFromFontsArray($fonts_array);
98	1	$handle_name = 'zwf-gfo-combined';
99	1	$this->enqueueStyle($handle_name, $combined_font_url);
100	1	$handles[] = $handle_name;
101		}
102
103	1	if (isset($fonts_array['partial'])) {
104	1	$cnt = 0;
105	1	foreach ($fonts_array['partial']['url'] as $url) {
106	1	$cnt++;
107	1	$handle_name = 'zwf-gfo-combined-txt-' . $cnt;
108	1	$this->enqueueStyle($handle_name, $url);
109	1	$handles[] = $handle_name;
110		}
111		}
112
113		// Remove/dequeue the ones we just combined above
114	1	$this->dequeueStyleHandles($candidate_handles);
115
116		// Removes processed handles from originally given $handles
117	1	$handles = array_diff($handles, array_keys($candidate_handles));
118
119	1	return $handles;
120		}
121
122		/**
123		* Given a list of WP style handles return a new "named map" of handles
124		* we care about along with their urls.
125		*
126		* TODO/FIXME: See if named deps will need to be taken care of...
127		*
128		* @codeCoverageIgnore
129		*
130		* @param array $handles
131		*
132		* @return array
133		*/
134		public function findCandidateHandles(array $handles)
135		{
136		$handler = /** @scrutinizer ignore-call */ \wp_styles();
137		$candidate_handles = [];
138
139		foreach ($handles as $handle) {
140		$dep = $handler->query($handle, 'registered');
141		if ($dep) {
142		$url = $dep->src;
143		if (Utils::isGoogleWebFontUrl($url)) {
144		$candidate_handles[$handle] = $url;
145		}
146		}
147		}
148
149		return $candidate_handles;
150		}
151
152		/**
153		* Dequeue given `$handles`.
154		*
155		* @param array $handles
156		*
157		* @return void
158		*/
159	1	public function dequeueStyleHandles(array $handles)
160	1	{
161	1	foreach ($handles as $handle => $url) {
162		// @codeCoverageIgnoreStart
163		if (function_exists('\wp_deregister_style')) {
164		/** @scrutinizer ignore-call */
165		\wp_deregister_style($handle);
166		}
167		if (function_exists('\wp_dequeue_style')) {
168		/** @scrutinizer ignore-call */
169		\wp_dequeue_style($handle);
170		}
171		// @codeCoverageIgnoreEnd
172	1	unset($this->enqueued[$handle]);
173		}
174	1	}
175
176		/**
177		* Enqueues a given style using `\wp_enqueue_style()` and keeps it in
178		* our own `$enqueued` list for reference.
179		*
180		* @param string $handle
181		* @param string $url
182		* @param array $deps
183		* @param string\|null $version
184		*
185		* @return void
186		*/
187	1	public function enqueueStyle($handle, $url, $deps = [], $version = null)
188	1	{
189		// @codeCoverageIgnoreStart
190		if (function_exists('\wp_enqueue_style')) {
191		/** @scrutinizer ignore-call */
192		\wp_enqueue_style($handle, $url, $deps, $version);
193		}
194		// @codeCoverageIgnoreEnd
195
196	1	$this->enqueued[$handle] = $url;
197	1	}
198
199		/**
200		* Get the entire list of enqueued styles or a specific one if $handle is specified.
201		*
202		* @param string\|null $handle Style "slug"
203		*
204		* @return array\|string
205		*/
206	1	public function getEnqueued($handle = null)
207	1	{
208	1	$data = $this->enqueued;
209
210	1	if (null !== $handle && isset($this->enqueued[$handle])) {
211	1	$data = $this->enqueued[$handle];
212		}
213
214	1	return $data;
215		}
216
217		/**
218		* Callback to invoke in oder to modify google fonts found in the HTML markup.
219		* Returns modified markup in which multiple google fonts requests are
220		* combined into a single one (if multiple requests are found).
221		*
222		* @param string $markup
223		*
224		* @return string
225		*/
226	4	public function processMarkup($markup)
227	4	{
228	4	$hrefs = $this->parseMarkupForHrefs($markup);
229	4	if (! empty($hrefs)) {
230	4	$this->setCandidates($hrefs);
231		}
232
233		// See if we found anything
234	4	$candidates = $this->getCandidates();
235
236		// Bail and return original markup unmodified if we don't have things to do
237	4	if (! $this->hasEnoughElements($candidates)) {
238	1	return $markup;
239		}
240
241		// Process what we found and modify original markup with our replacement
242	4	$fonts_array = $this->getFontsArray($candidates);
243	4	$font_markup = $this->buildFontsMarkup($fonts_array);
244	4	$markup = $this->modifyMarkup($markup, $font_markup, $fonts_array['links']);
245
246	4	return $markup;
247		}
248
249		/**
250		* Given a string of $markup, returns an array of hrefs we're interested in.
251		*
252		* @param string $markup
253		*
254		* @return array
255		*/
256	4	protected function parseMarkupForHrefs($markup)
257	4	{
258	4	$dom = new \DOMDocument();
259		// @codingStandardsIgnoreLine
260	4	/** @scrutinizer ignore-unhandled */ @$dom->loadHTML($markup);
261		// Looking for all <link> elements
262	4	$links = $dom->getElementsByTagName('link');
263	4	$hrefs = $this->filterHrefsFromCandidateLinkNodes($links);
264
265	4	return $hrefs;
266		}
267
268		/**
269		* Returns the list of google web fonts stylesheet hrefs found.
270		*
271		* @param \DOMNodeList $nodes
272		*
273		* @return array
274		*/
275	4	protected function filterHrefsFromCandidateLinkNodes(\DOMNodeList $nodes)
276	4	{
277	4	$hrefs = [];
278
279	4	foreach ($nodes as $node) {
280	4	if ($this->isCandidateLink($node)) {
281	4	$hrefs[] = $node->getAttribute('href');
282		}
283		}
284
285	4	return $hrefs;
286		}
287
288		/**
289		* Returns true if given DOMNode is a stylesheet and points to a Google Web Fonts url.
290		*
291		* @param \DOMNode $node
292		*
293		* @return bool
294		*/
295	4	protected function isCandidateLink(\DOMNode $node)
296	4	{
297	4	$rel = $node->getAttribute('rel');
298	4	$href = $node->getAttribute('href');
299
300	4	return ('stylesheet' === $rel && Utils::isGoogleWebFontUrl($href));
301		}
302
303		/**
304		* Modifies given $markup to include given $font_markup in the <head>.
305		* Also removes any existing stylesheets containing the given $font_links (if found).
306		*
307		* @param string $markup
308		* @param string $font_markup
309		* @param array $font_links
310		*
311		* @return string
312		*/
313	4	public function modifyMarkup($markup, $font_markup, array $font_links)
314	4	{
315	4	$new_markup = $markup;
316
317		// Remove existing stylesheets
318	4	foreach ($font_links as $font_link) {
319	4	$font_link = preg_quote($font_link, '/');
320
321		// Tweak back what DOMDocument replaces sometimes
322	4	$font_link = str_replace('&', '&', $font_link);
323		// This adds an extra capturing group in the pattern actually
324	4	$font_link = str_replace('&', '(&\|&\|&)', $font_link);
325		// Match this url's link tag, including optional newlines at the end of the string
326	4	$pattern = '/<link([^>]?)href[\s]?=[\s]?[\'\"\\\]' . $font_link . '([^>]*?)>([\s]+)?/is';
327		// Now replace
328	4	$new_markup = preg_replace($pattern, '', $new_markup);
329		}
330
331		// Adding the font markup to top of <head> for now
332		// TODO/FIXME: This could easily break when someone uses `<head>` in HTML comments and such?
333	4	$new_markup = str_ireplace('<head>', '<head>' . $font_markup, trim($new_markup));
334
335	4	return $new_markup;
336		}
337
338	1	public function startBuffering()
339	1	{
340	1	$started = false;
341
342	1	if ($this->shouldBuffer()) {
343		/**
344		* N.B.
345		* In theory, others might've already started buffering before us,
346		* which can prevent us from getting the markup.
347		* If that becomes an issue, we can call shouldCleanOutputBuffers()
348		* and cleanOutputBuffers() here before starting our buffering.
349		*/
350
351		// Start our own buffering
352	1	$started = ob_start([$this, 'endBuffering']);
353		}
354
355	1	return $started;
356		}
357
358	2	public function endBuffering($markup)
359	2	{
360		// Bail early on things we don't want to parse
361	2	if (! $this->isMarkupDoable($markup)) {
362	2	return $markup;
363		}
364
365	1	return $this->processMarkup($markup);
366		}
367
368		/**
369		* Determines whether the current WP request should be buffered.
370		*
371		* @return bool
372		* @codeCoverageIgnore
373		*/
374		protected function shouldBuffer()
375		{
376		$buffer = true;
377
378		if ($buffer && function_exists('\is_admin') && /** @scrutinizer ignore-call */ is_admin()) {
379		$buffer = false;
380		}
381
382		if ($buffer && function_exists('\is_feed') && /** @scrutinizer ignore-call */ is_feed()) {
383		$buffer = false;
384		}
385
386		if ($buffer && defined('\DOING_AJAX')) {
387		$buffer = false;
388		}
389
390		if ($buffer && defined('\DOING_CRON')) {
391		$buffer = false;
392		}
393
394		if ($buffer && defined('\WP_CLI')) {
395		$buffer = false;
396		}
397
398		if ($buffer && defined('\APP_REQUEST')) {
399		$buffer = false;
400		}
401
402		if ($buffer && defined('\XMLRPC_REQUEST')) {
403		$buffer = false;
404		}
405
406		if ($buffer && defined('\SHORTINIT') && \SHORTINIT) {
		1 ignored issue – show Bug introduced 2017-10-19 13:57 UTC by Report Bug Copy Issue Report The constant `SHORTINIT` was not found. Maybe you did not declare it correctly or list all dependencies? Loading history...
407		$buffer = false;
408		}
409
410		return $buffer;
411		}
412
413		/**
414		* @codeCoverageIgnore
415		*/
416		protected function shouldCleanOutputBuffers()
417		{
418		return apply_filters(self::FILTER_OB_CLEANER, self::DEFAULT_OB_CLEANER);
419		}
420
421		/**
422		* @codeCoverageIgnore
423		*/
424		protected function cleanOutputBuffers()
425		{
426		while (ob_get_level() > 0) {
427		ob_end_clean();
428		}
429		}
430
431		/**
432		* Returns true if given markup should be processed.
433		*
434		* @param string $content
435		*
436		* @return bool
437		*/
438	2	protected function isMarkupDoable($content)
439	2	{
440	2	$html = Utils::hasHtmlTag($content);
441	2	$html5 = Utils::hasHtml5Doctype($content);
442	2	$xsl = Utils::hasXslStylesheet($content);
443
444	2	return (($html \|\| $html5) && ! $xsl);
445		}
446
447		/**
448		* @param array $urls
449		*/
450	5	public function setCandidates(array $urls = [])
451	5	{
452	5	$this->candidates = $urls;
453	5	}
454
455		/**
456		* @return array
457		*/
458	5	public function getCandidates()
459	5	{
460	5	return $this->candidates;
461		}
462
463		/**
464		* Given a list of google fonts urls it returns another array of data
465		* representing found families/sizes/subsets/urls.
466		*
467		* @param array $candidates
468		*
469		* @return array
470		*/
471	5	protected function getFontsArray(array $candidates = [])
472	5	{
473	5	$fonts = [];
474
475	5	foreach ($candidates as $candidate) {
476	5	$fonts['links'][] = $candidate;
477
478	5	$params = [];
479	5	parse_str(parse_url($candidate, PHP_URL_QUERY), $params);
480
481	5	if (isset($params['text'])) {
482		// Fonts with character limitations are segregated into
483		// under 'partial' (when `text` query param is used)
484	3	$font_family = explode(':', $params['family']);
485	3	$fonts['partial']['name'][] = $font_family[0];
486	3	$fonts['partial']['url'][] = Utils::httpsify($candidate);
487		} else {
488	5	$fontstrings = $this->buildFontStringsFromQueryParams($params);
489	5	foreach ($fontstrings as $font) {
490	5	$fonts['complete'][] = $font;
491		}
492		}
493		}
494
495	5	return $fonts;
496		}
497
498		/**
499		* Looks for and parses the `family` query string value into a string
500		* that Google Fonts expects (family, weights and subsets separated by
501		* a semicolon).
502		*
503		* @param array $params
504		*
505		* @return array
506		*/
507	5	protected function buildFontStringsFromQueryParams(array $params)
508	5	{
509	5	$fonts = [];
510
511	5	foreach (explode('\|', $params['family']) as $family) {
512	5	$font = $this->parseFontStringFamilyParam($family, $params);
513	5	if (! empty($font)) {
514	5	$fonts[] = $font;
515		}
516		}
517
518	5	return $fonts;
519		}
520
521		/**
522		* @param string $family
523		* @param array $params
524		*
525		* @return string
526		*/
527	5	protected function parseFontStringFamilyParam($family, array $params)
528	5	{
529	5	$subset = false;
530	5	$family = explode(':', $family);
531
532	5	if (isset($params['subset'])) {
533		// Use the found subset query parameter
534	4	$subset = $params['subset'];
535	3	} elseif (isset($family[2])) {
536		// Use the subset in the family string if present
537	1	$subset = $family[2];
538		}
539
540		// $family can have a lot of thing specified with separators etc.
541	5	$parts = $this->buildFontStringParts($family, $subset);
542	5	$font = implode(':', $parts);
543
544	5	return $font;
545		}
546
547		/**
548		* Makes sure we only include what we needValidate and return needed font parts data.
549		*
550		* @param array $family
551		* @param bool $subset
552		*
553		* @return array
554		*/
555	5	protected function buildFontStringParts(array $family, $subset = false)
556	5	{
557	5	$parts = [];
558
559		// First part is the font name, which should always be present
560	5	$parts[] = $family[0];
561
562		// Check if sizes are specified
563	5	if (isset($family[1]) && strlen($family[1]) > 0) {
564	4	$parts[] = $family[1];
565		}
566
567		// Add the subset if specified
568	5	if ($subset) {
569	4	$parts[] = $subset;
570		}
571
572	5	return $parts;
573		}
574
575		/**
576		* Given data from `getFontsArray()` builds HTML markup for found google fonts.
577		*
578		* @param array $fonts_array
579		*
580		* @return string
581		*/
582	4	protected function buildFontsMarkup(array $fonts_array)
583	4	{
584	4	$markup_type = apply_filters(self::FILTER_MARKUP_TYPE, self::DEFAULT_MARKUP_TYPE);
585	4	if ('link' === $markup_type) {
586		// Build standard link markup
587	2	$markup = Utils::buildFontsMarkupLinks($fonts_array);
588		} else {
589		// Bulding WebFont script loader
590	2	$markup = Utils::buildFontsMarkupScript($fonts_array);
591		}
592
593	4	return $markup;
594		}
595		}
596

zytzagoo / wp-google-fonts-optimizer

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