VueJs::getTemplateFakeJs() - Code Metrics - Inspection of "Add support for translation extraction from VueJs..." - oscarotero/Gettext - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#178)

by Mārtiņš

created 2018-04-29 22:09 UTC

VueJs::getTemplateFakeJs() A

↳ Parent: VueJs

Complexity

Conditions	2
Paths	2

Size

Total Lines	14
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
eloc	7
nc	2
nop	1
dl	0
loc	14
rs	9.4285
c	0
b	0
f	0

<?php

namespace Gettext\Extractors;

use DOMAttr;
use DOMDocument;
use DOMElement;
use Gettext\Translations;
use Gettext\Utils\VueJsFunctionScanner;

/**
 * Class to get gettext strings from VueJS template files.
 */
class VueJs extends JsCode implements ExtractorInterface
{
    /**
     * @inheritdoc
     * @throws \Exception
     */
    public static function fromString($string, Translations $translations, array $options = [])
    {
        $options += self::$options;

        // Ok, this is the weirdest hack, but let me explain:
        // On Linux (Mac is fine), when converting HTML to DOM, new lines get trimmed after the first tag.
        // So if there are new lines between <template> and next element, they are lost
        // So we insert a "." which is a text node, and it will prevent that newlines are stripped between elements.
        // Same thing happens between template and script tag.
        $string = str_replace('<template>', '<template>.', $string);
        $string = str_replace('</template>', '</template>.', $string);

        // Normalize newlines
        $string = str_replace(["\r\n", "\n\r", "\r"], "\n", $string);

        // VueJS files are valid HTML files, we will operate with the DOM here
        $dom = self::convertHtmlToDom($string);

        // Parse the script part as a regular JS code
        $script = $dom->getElementsByTagName('script')->item(0);
        if ($script) {
            self::getScriptTranslationsFromString($script->textContent, $translations, $options, $script->getLineNo());
        }

        // Template part is parsed separately, all variables will be extracted
        // and handled as a regular JS code
        $template = $dom->getElementsByTagName('template')->item(0);
        if ($template) {
            self::getTemplateTranslations($template, $translations, $options, $template->getLineNo());
        }
    }

    /**
     * @param string $html
     * @return DOMDocument
     */
    private static function convertHtmlToDom($html)
    {
        $dom = new DOMDocument;

        libxml_use_internal_errors(true);
        $dom->loadHTML($html);

        libxml_clear_errors();

        return $dom;
    }

    /**
     * Extract translations from script part
     *
     * @param string $scriptContents Only script tag contents, not the whole template
     * @param Translations $translations
     * @param array $options
     * @param int $lineOffset Number of lines the script is offset in the vue template file
     * @throws \Exception
     */
    private static function getScriptTranslationsFromString(
        $scriptContents,
        Translations $translations,
        array $options = [],
        $lineOffset = 0
    ) {
        $functions = new VueJsFunctionScanner($scriptContents);
        $functions->lineOffset = $lineOffset;
        $functions->saveGettextFunctions($translations, $options);
    }

    /**
     * Parse template to extract all translations (element content and dynamic element attributes)
     *
     * @param DOMElement $dom
     * @param Translations $translations
     * @param array $options
     * @param int $lineOffset Line number where the template part starts in the vue file
     * @throws \Exception
     */
    private static function getTemplateTranslations(
        DOMElement $dom,
        Translations $translations,
        array $options,
        $lineOffset = 0
    ) {
        // Build a JS string from all template attribute expressions
        $fakeAttributeJs = self::getTemplateAttributeFakeJs($dom);

        // 1 line offset is necessary because parent template element was ignored when converting to DOM
        self::getScriptTranslationsFromString($fakeAttributeJs, $translations, $options, $lineOffset);

        // Build a JS string from template element content expressions
        $fakeTemplateJs = self::getTemplateFakeJs($dom);
        self::getScriptTranslationsFromString($fakeTemplateJs, $translations, $options, $lineOffset);
    }

    /**
     * Extract JS expressions from element attribute bindings (excluding text within elements)
     * For example: <span :title="__('extract this')"> skip element content </span>
     *
     * @param DOMElement $dom
     * @return string JS code
     */
    private static function getTemplateAttributeFakeJs(DOMElement $dom)
    {
        $expressionsByLine = self::getVueAttributeExpressions($dom);

        $maxLines = max(array_keys($expressionsByLine));
        $fakeJs = '';

        for ($line = 1; $line <= $maxLines; $line++) {
            if (isset($expressionsByLine[$line])) {
                $fakeJs .= implode("; ", $expressionsByLine[$line]);
            }
            $fakeJs .= "\n";
        }

        return $fakeJs;
    }

    /**
     * Loop DOM element recursively and parse out all dynamic vue attributes which are basically JS expressions
     *
     * @param DOMElement $dom
     * @param array $expressionByLine [lineNumber => [jsExpression, ..], ..]
     * @return array [lineNumber => [jsExpression, ..], ..]
     */
    private static function getVueAttributeExpressions(DOMElement $dom, array &$expressionByLine = [])
    {
        $children = $dom->childNodes;

        for ($i = 0; $i < $children->length; $i++) {
            $node = $children->item($i);

            if (!($node instanceof DOMElement)) {
                continue;
            }

            $attrList = $node->attributes;

            for ($j = 0; $j < $attrList->length; $j++) {

                /** @var DOMAttr $domAttr */
                $domAttr = $attrList->item($j);

                // Check if this is a dynamic vue attribute
                if (strpos($domAttr->name, ':') === 0 || strpos($domAttr->name, 'v-bind:') === 0) {
                    $line = $domAttr->getLineNo();
                    $expressionByLine += [$line => []];
                    $expressionByLine[$line][] = $domAttr->value;
                }
            }

            if ($node->hasChildNodes()) {
                $expressionByLine = self::getVueAttributeExpressions($node, $expressionByLine);
            }
        }

        return $expressionByLine;
    }

    /**
     * Extract JS expressions from within template elements (excluding attributes)
     * For example: <span :title="skip attributes"> {{__("extract element content")}} </span>
     *
     * @param DOMElement $dom
     * @return string JS code
     */
    private static function getTemplateFakeJs(DOMElement $dom)
    {
        $fakeJs = '';
        $lines = explode("\n", $dom->textContent);

        // Build a fake JS file from template by extracting JS expressions within each template line
        foreach ($lines as $line) {
            $expressionMatched = self::parseOneTemplateLine($line);

            $fakeJs .= implode("; ", $expressionMatched) . "\n";
        }

        return $fakeJs;
    }

    /**
     * Match JS expressions in a template line
     *
     * @param string $line
     * @return string[]
     */
    private static function parseOneTemplateLine($line)
    {
        $line = trim($line);

        if (!$line) {
            return [];
        }

        $regex = '#\{\{(.*?)\}\}#';

        preg_match_all($regex, $line, $matches);

        $matched = array_map(function ($v) {
            return trim($v, '\'"{}');
        }, $matches[1]);

        return $matched;
    }
}


1			<?php
2
3			namespace Gettext\Extractors;
4
5			use DOMAttr;
6			use DOMDocument;
7			use DOMElement;
8			use Gettext\Translations;
9			use Gettext\Utils\VueJsFunctionScanner;
10
11			/**
12			* Class to get gettext strings from VueJS template files.
13			*/
14			class VueJs extends JsCode implements ExtractorInterface
15			{
16			/**
17			* @inheritdoc
18			* @throws \Exception
19			*/
20			public static function fromString($string, Translations $translations, array $options = [])
21			{
22			$options += self::$options;
23
24			// Ok, this is the weirdest hack, but let me explain:
25			// On Linux (Mac is fine), when converting HTML to DOM, new lines get trimmed after the first tag.
26			// So if there are new lines between <template> and next element, they are lost
27			// So we insert a "." which is a text node, and it will prevent that newlines are stripped between elements.
28			// Same thing happens between template and script tag.
29			$string = str_replace('<template>', '<template>.', $string);
30			$string = str_replace('</template>', '</template>.', $string);
31
32			// Normalize newlines
33			$string = str_replace(["\r\n", "\n\r", "\r"], "\n", $string);
34
35			// VueJS files are valid HTML files, we will operate with the DOM here
36			$dom = self::convertHtmlToDom($string);
37
38			// Parse the script part as a regular JS code
39			$script = $dom->getElementsByTagName('script')->item(0);
40			if ($script) {
41			self::getScriptTranslationsFromString($script->textContent, $translations, $options, $script->getLineNo());
42			}
43
44			// Template part is parsed separately, all variables will be extracted
45			// and handled as a regular JS code
46			$template = $dom->getElementsByTagName('template')->item(0);
47			if ($template) {
48			self::getTemplateTranslations($template, $translations, $options, $template->getLineNo());
49			}
50			}
51
52			/**
53			* @param string $html
54			* @return DOMDocument
55			*/
56			private static function convertHtmlToDom($html)
57			{
58			$dom = new DOMDocument;
59
60			libxml_use_internal_errors(true);
61			$dom->loadHTML($html);
62
63			libxml_clear_errors();
64
65			return $dom;
66			}
67
68			/**
69			* Extract translations from script part
70			*
71			* @param string $scriptContents Only script tag contents, not the whole template
72			* @param Translations $translations
73			* @param array $options
74			* @param int $lineOffset Number of lines the script is offset in the vue template file
75			* @throws \Exception
76			*/
77			private static function getScriptTranslationsFromString(
78			$scriptContents,
79			Translations $translations,
80			array $options = [],
81			$lineOffset = 0
82			) {
83			$functions = new VueJsFunctionScanner($scriptContents);
84			$functions->lineOffset = $lineOffset;
85			$functions->saveGettextFunctions($translations, $options);
86			}
87
88			/**
89			* Parse template to extract all translations (element content and dynamic element attributes)
90			*
91			* @param DOMElement $dom
92			* @param Translations $translations
93			* @param array $options
94			* @param int $lineOffset Line number where the template part starts in the vue file
95			* @throws \Exception
96			*/
97			private static function getTemplateTranslations(
98			DOMElement $dom,
99			Translations $translations,
100			array $options,
101			$lineOffset = 0
102			) {
103			// Build a JS string from all template attribute expressions
104			$fakeAttributeJs = self::getTemplateAttributeFakeJs($dom);
105
106			// 1 line offset is necessary because parent template element was ignored when converting to DOM
107			self::getScriptTranslationsFromString($fakeAttributeJs, $translations, $options, $lineOffset);
108
109			// Build a JS string from template element content expressions
110			$fakeTemplateJs = self::getTemplateFakeJs($dom);
111			self::getScriptTranslationsFromString($fakeTemplateJs, $translations, $options, $lineOffset);
112			}
113
114			/**
115			* Extract JS expressions from element attribute bindings (excluding text within elements)
116			* For example: <span :title="__('extract this')"> skip element content </span>
117			*
118			* @param DOMElement $dom
119			* @return string JS code
120			*/
121			private static function getTemplateAttributeFakeJs(DOMElement $dom)
122			{
123			$expressionsByLine = self::getVueAttributeExpressions($dom);
124
125			$maxLines = max(array_keys($expressionsByLine));
126			$fakeJs = '';
127
128			for ($line = 1; $line <= $maxLines; $line++) {
129			if (isset($expressionsByLine[$line])) {
130			$fakeJs .= implode("; ", $expressionsByLine[$line]);
131			}
132			$fakeJs .= "\n";
133			}
134
135			return $fakeJs;
136			}
137
138			/**
139			* Loop DOM element recursively and parse out all dynamic vue attributes which are basically JS expressions
140			*
141			* @param DOMElement $dom
142			* @param array $expressionByLine [lineNumber => [jsExpression, ..], ..]
143			* @return array [lineNumber => [jsExpression, ..], ..]
144			*/
145			private static function getVueAttributeExpressions(DOMElement $dom, array &$expressionByLine = [])
146			{
147			$children = $dom->childNodes;
148
149			for ($i = 0; $i < $children->length; $i++) {
150			$node = $children->item($i);
151
152			if (!($node instanceof DOMElement)) {
153			continue;
154			}
155
156			$attrList = $node->attributes;
157
158			for ($j = 0; $j < $attrList->length; $j++) {
			0 ignored issues – show Bug introduced 2018-04-29 13:11 UTC by Report Bug Copy Issue Report The property `length` does not seem to exist in `DOMNamedNodeMap`. An attempt at access to an undefined property has been detected. This may either be a typographical error or the property has been renamed but there are still references to its old name. If you really want to allow access to undefined properties, you can define magic methods to allow access. See the php core documentation on Overloading. Loading history...
159			/** @var DOMAttr $domAttr */
160			$domAttr = $attrList->item($j);
161
162			// Check if this is a dynamic vue attribute
163			if (strpos($domAttr->name, ':') === 0 \|\| strpos($domAttr->name, 'v-bind:') === 0) {
164			$line = $domAttr->getLineNo();
165			$expressionByLine += [$line => []];
166			$expressionByLine[$line][] = $domAttr->value;
167			}
168			}
169
170			if ($node->hasChildNodes()) {
171			$expressionByLine = self::getVueAttributeExpressions($node, $expressionByLine);
172			}
173			}
174
175			return $expressionByLine;
176			}
177
178			/**
179			* Extract JS expressions from within template elements (excluding attributes)
180			* For example: <span :title="skip attributes"> {{__("extract element content")}} </span>
181			*
182			* @param DOMElement $dom
183			* @return string JS code
184			*/
185			private static function getTemplateFakeJs(DOMElement $dom)
186			{
187			$fakeJs = '';
188			$lines = explode("\n", $dom->textContent);
189
190			// Build a fake JS file from template by extracting JS expressions within each template line
191			foreach ($lines as $line) {
192			$expressionMatched = self::parseOneTemplateLine($line);
193
194			$fakeJs .= implode("; ", $expressionMatched) . "\n";
195			}
196
197			return $fakeJs;
198			}
199
200			/**
201			* Match JS expressions in a template line
202			*
203			* @param string $line
204			* @return string[]
205			*/
206			private static function parseOneTemplateLine($line)
207			{
208			$line = trim($line);
209
210			if (!$line) {
211			return [];
212			}
213
214			$regex = '#\{\{(.*?)\}\}#';
215
216			preg_match_all($regex, $line, $matches);
217
218			$matched = array_map(function ($v) {
219			return trim($v, '\'"{}');
220			}, $matches[1]);
221
222			return $matched;
223			}
224			}
225

oscarotero / Gettext

Pull Request — master (#178)

VueJs::getTemplateFakeJs() A

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