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<?php
namespace Fisharebest\Webtrees;
use Fisharebest\Webtrees\Encodings\UTF8;
use InvalidArgumentException;
use Normalizer;
use Stringable;
/**
* User submitted text.
*/
final readonly class Text implements Stringable
{
private string $text;
public function __construct(string $text)
{
// Replace invalid UTF-8 characters with the Unicode replacement character.
$text = mb_convert_encoding($text, 'UTF-8', 'UTF-8');
// Replace combining characters with their precomposed equivalents.
$this->text = Normalizer::normalize($text, Normalizer::FORM_C);
}
public function text(): string
{
return $this->text;
}
/**
* Substring function that does not break grapheme clusters or combining diacritics.
*/
public function substr(int $offset, int $length): self
{
// If the offset points to the middle of a grapheme cluster or combining diacritic, then move it.
if ($offset < 0) {
$offset = mb_strlen(grapheme_extract($this->text, mb_strlen($this->text) + $offset, GRAPHEME_EXTR_MAXCHARS));
} else {
$offset = mb_strlen(grapheme_extract($this->text, $offset, GRAPHEME_EXTR_MAXCHARS));
}
$text = grapheme_extract($this->text, $offset, $length);
if ($text === false) {
// Should never happen, as we validated the text in the constructor.
$text = UTF8::REPLACEMENT_CHARACTER;
}
return new self($text);
}
/**
* Truncate to fit in a database field.
* Do not split any combining characters or grapheme clusters.
*/
public function truncate(int $length): string
{
$text = grapheme_extract($this->text, $length, GRAPHEME_EXTR_MAXCHARS);
if ($text === false) {
// Should never happen, as we validated the text in the constructor.
$text = UTF8::REPLACEMENT_CHARACTER;
}
return $text;
}
public function lengthBytes(): int
{
return strlen($this->text);
}
public function lengthChars(): int
{
return mb_strlen($this->text);
}
public function lengthGraphemes(): int
{
return grapheme_strlen($this->text);
}
public function __toString(): string
{
return $this->text;
}
}
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