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<?php
/**
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
* @since Stud.IP 5.5
*/
class HTMLAttributes implements Stringable, ArrayAccess
{
protected static $handlers = [
'class' => [self::class, 'handleCSSClass'],
'style' => [self::class, 'handleCSSStyle'],
];
public static function from(array $attributes): HTMLAttributes
{
return new static($attributes);
}
public static function merge(array ...$attr): HTMLAttributes
{
$result = new static(array_pop($attr));
foreach ($attr as $a) {
$result->addAttributes($a);
}
return $result;
}
public static function addHandler(string $key, callable $handler): void
{
$key = self::sanitizeKey($key);
self::$handlers[$key] = $handler;
}
public static function removeHandler(string $key): void
{
$key = self::sanitizeKey($key);
if (isset(self::$handlers[$key])) {
unset(self::$handlers[$key]);
}
}
public static function sanitizeKey(string $key): string
{
return strtolower(trim($key));
}
public static function handleCSSClass($value, string $previous, bool $replace = false): string
{
$classes = [];
if (!$replace) {
$classes = explode(' ', $previous);
$classes = array_filter($classes);
}
foreach ((array) $value as $class) {
if (!in_array($class, $classes)) {
$classes[] = $class;
}
}
return implode(' ', $classes);
}
public static function parseCSSStyles(string $style): array
{
$temp = explode(';', $style);
$temp = array_filter($temp);
$styles = [];
foreach ($temp as $item) {
[$k, $v] = array_map('trim', explode(':', $item, 2));
$styles[$k] = $v;
}
return $styles;
}
public static function renderCSSStyles(array $styles): string
{
$rows = [];
foreach ($styles as $key => $value) {
$rows[] = "{$key}:{$value}";
}
return implode(';', $rows);
}
public static function handleCSSStyle($value, string $previous, bool $replace = false): string
{
$styles = array_merge(
$replace ? [] : self::parseCSSStyles($previous),
self::parseCSSStyles($value)
);
return self::renderCSSStyles($styles);
}
protected $attributes = [];
final public function __construct(array $attributes = [])
{
$this->addAttributes($attributes);
}
public function isAttributeValid($value, ?string $key = null): bool
{
return isset($value) && $value !== false;
}
public function hasAttribute(string $key): bool
{
$key = $this->sanitizeKey($key);
return isset($this->attributes[$key]);
}
public function setAttribute(string $key, $value): void
{
$this->addAttribute($key, $value, true);
}
public function addAttribute(string $key, $value, bool $replace = false): bool
{
$key = $this->sanitizeKey($key);
if (!$this->isAttributeValid($value, $key)) {
return false;
}
if (isset(self::$handlers[$key])) {
$this->attributes[$key] = self::$handlers[$key]($value, $this->attributes[$key] ?? '', $replace);
} else {
$this->attributes[$key] = $value;
}
return true;
}
public function setAttributes(array $attributes): void
{
$this->addAttributes($attributes, true);
}
public function addAttributes(array $attributes, bool $replace = false): void
{
foreach ($attributes as $key => $value) {
$this->addAttribute($key, $value, $replace);
}
}
public function getAttribute(string $key)
{
if (!$this->hasAttribute($key)) {
return null;
}
$key = $this->sanitizeKey($key);
return $this->attributes[$key];
}
public function getAttributes(): array
{
return $this->attributes;
}
public function removeAttribute(string $key): bool
{
if (!$this->hasAttribute($key)) {
return false;
}
$key = $this->sanitizeKey($key);
unset($this->attributes[$key]);
return true;
}
public function asString(): string
{
// Filter empty attributes
$attributes = array_filter($this->attributes, function ($value) {
return isset($value) && $value !== false;
});
// Actual conversion
$result = [];
foreach ($attributes as $key => $value) {
if ($value === true) {
$result[] = htmlReady($key);
} else {
$result[] = sprintf('%s="%s"', htmlReady($key), htmlReady($value));
}
}
return implode(' ', $result);
}
public function __toString(): string
{
return $this->asString();
}
# ArrayAccess
public function offsetExists($offset): bool
{
return $this->hasAttribute($offset);
}
public function offsetGet($offset): mixed
{
return $this->getAttribute($offset);
}
public function offsetSet($offset, $value): void
{
$this->addAttribute($offset, $value);
}
public function offsetUnset($offset): void
{
$this->removeAttribute($offset);
}
}
|
