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<?php
namespace Laravel\Prompts\Concerns;
use InvalidArgumentException;
trait Truncation
{
/**
* Truncate a value with an ellipsis if it exceeds the given width.
*/
protected function truncate(string $string, int $width): string
{
if ($width <= 0) {
throw new InvalidArgumentException("Width [{$width}] must be greater than zero.");
}
return mb_strwidth($string) <= $width ? $string : (mb_strimwidth($string, 0, $width - 1).'…');
}
/**
* Multi-byte version of wordwrap.
*
* @param non-empty-string $break
*/
protected function mbWordwrap(
string $string,
int $width = 75,
string $break = "\n",
bool $cut_long_words = false
): string {
$lines = explode($break, $string);
$result = [];
foreach ($lines as $originalLine) {
if (mb_strwidth($originalLine) <= $width) {
$result[] = $originalLine;
continue;
}
$words = explode(' ', $originalLine);
$line = null;
$lineWidth = 0;
if ($cut_long_words) {
foreach ($words as $index => $word) {
$characters = mb_str_split($word);
$strings = [];
$str = '';
foreach ($characters as $character) {
$tmp = $str.$character;
if (mb_strwidth($tmp) > $width) {
$strings[] = $str;
$str = $character;
} else {
$str = $tmp;
}
}
if ($str !== '') {
$strings[] = $str;
}
$words[$index] = implode(' ', $strings);
}
$words = explode(' ', implode(' ', $words));
}
foreach ($words as $word) {
$tmp = ($line === null) ? $word : $line.' '.$word;
// Look for zero-width joiner characters (combined emojis)
preg_match('/\p{Cf}/u', $word, $joinerMatches);
$wordWidth = count($joinerMatches) > 0 ? 2 : mb_strwidth($word);
$lineWidth += $wordWidth;
if ($line !== null) {
// Space between words
$lineWidth += 1;
}
if ($lineWidth <= $width) {
$line = $tmp;
} else {
$result[] = $line;
$line = $word;
$lineWidth = $wordWidth;
}
}
if ($line !== '') {
$result[] = $line;
}
$line = null;
}
return implode($break, $result);
}
}
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