mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-06-21 04:01:36 +02:00
0d27f32cc9
In some situations, a caption is used in place of a value in the alt attribute, and in others an image may be cosmetic and not in need of an alt attribute value (though the alt attribute must still be rendered in this case).
92 lines
2.2 KiB
PHP
92 lines
2.2 KiB
PHP
<?php
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namespace SilverStripe\View;
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use InvalidArgumentException;
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use SilverStripe\Core\Config\Configurable;
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use SilverStripe\Core\Convert;
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/**
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* HTML Helper class
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*/
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class HTML
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{
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use Configurable;
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/**
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* List of HTML5 void elements
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*
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* @see https://www.w3.org/TR/html51/syntax.html#void-elements
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* @config
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* @var array
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*/
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private static $void_elements = [
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'area',
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'base',
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'br',
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'col',
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'embed',
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'hr',
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'img',
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'input',
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'keygen',
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'link',
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'menuitem',
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'meta',
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'param',
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'source',
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'track',
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'wbr'
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];
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/**
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* List of attributes that should be rendered even if they contain no value
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*
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* @config
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* @var array
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*/
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private static $legal_empty_attributes = [
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'alt',
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];
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/**
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* Construct and return HTML tag.
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*
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* @param string $tag
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* @param array $attributes
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* @param string $content Content to use between two tags. Not valid for void elements (e.g. link)
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* @return string
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*/
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public static function createTag($tag, $attributes, $content = null)
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{
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$tag = strtolower($tag);
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// Build list of arguments
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$legalEmptyAttributes = static::config()->get('legal_empty_attributes');
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$preparedAttributes = '';
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foreach ($attributes as $attributeKey => $attributeValue) {
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$whitelisted = in_array($attributeKey, $legalEmptyAttributes);
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// Only set non-empty strings (ensures strlen(0) > 0)
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if (strlen($attributeValue) > 0 || $whitelisted) {
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$preparedAttributes .= sprintf(
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' %s="%s"',
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$attributeKey,
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Convert::raw2att($attributeValue)
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);
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}
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}
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// Check void element type
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if (in_array($tag, static::config()->get('void_elements'))) {
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if ($content) {
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throw new InvalidArgumentException("Void element \"{$tag}\" cannot have content");
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}
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return "<{$tag}{$preparedAttributes} />";
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}
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// Closed tag type
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return "<{$tag}{$preparedAttributes}>{$content}</{$tag}>";
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}
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}
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