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<?php /* * This file is part of Psy Shell. * * (c) 2012-2026 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. / namespace Psy\Readline\Interactive\Layout; use Symfony\Component\Console\Formatter\OutputFormatterInterface; use Symfony\Component\Console\Helper\Helper; /* * Display-width string helpers for terminal rendering and navigation. * * Width modes: * - width: plain text width, no formatting/ANSI stripping. * - widthWithoutFormatting: parse formatter tags, then measure visible width. * - widthWithoutAnsi: strip ANSI/control sequences from rendered output. / class DisplayString { /* * ANSI/control-sequence regexes for rendered terminal output. / private const ANSI_CSI_RX = '/\x1B\[[0-9;?][ -\/][@-~]/'; private const ANSI_OSC_RX = '/\x1B\][^\x07\x1B](?:\x07\|\x1B\\\\)/'; /** * Measure plain text width with no stripping. / /* @var bool\|null / private static $hasHelperWidth; public static function width(string $text): int { // Helper::width() added in Symfony 5.3; fall back to strlen() for older versions. if (self::$hasHelperWidth ?? (self::$hasHelperWidth = \method_exists(Helper::class, 'width'))) { return Helper::width($text); } / @phan-suppress-next-line PhanDeprecatedFunction BC fallback for Symfony < 5.3. / return Helper::strlen($text); } /* * Measure width after applying/removing formatter markup. * * Use this for strings that intentionally contain formatter tags like * "<info>...</info>" and should be measured by their rendered width. / public static function widthWithoutFormatting(string $text, OutputFormatterInterface $formatter): int { return self::width(Helper::removeDecoration($formatter, $text)); } /* * Measure width from already-rendered terminal output. * * This strips ANSI/control sequences only; it does not parse formatter * markup like "<info>...</info>". / public static function widthWithoutAnsi(string $text): int { return self::width(self::stripAnsi($text)); } /* * Resolve the code-point offset for a target display width. * * The returned offset is always on a grapheme boundary. / public static function offsetForWidth(string $text, int $targetWidth): int { if ($targetWidth <= 0 \|\| $text === '') { return 0; } $offset = 0; $width = 0; foreach (self::graphemes($text) as $grapheme) { $graphemeWidth = self::width($grapheme); if ($width + $graphemeWidth > $targetWidth) { break; } $width += $graphemeWidth; $offset += \mb_strlen($grapheme); } return $offset; } /* * Truncate text to a maximum display width with optional ellipsis. / public static function truncate(string $text, int $maxWidth, bool $withEllipsis = false): string { if ($maxWidth <= 0 \|\| $text === '') { return ''; } if (self::width($text) <= $maxWidth) { return $text; } if (!$withEllipsis \|\| $maxWidth <= 3) { return Helper::substr($text, 0, $maxWidth); } $targetWidth = $maxWidth - 3; $offset = self::offsetForWidth($text, $targetWidth); return \mb_substr($text, 0, $offset).'...'; } /* * Iterate grapheme clusters in a string. * * @return string[] / private static function graphemes(string $text): array { if (\preg_match_all('/\X/u', $text, $matches) > 0) { return $matches[0]; } // Fallback to individual code points when grapheme matching fails. $length = \mb_strlen($text); $chars = []; for ($i = 0; $i < $length; $i++) { $chars[] = \mb_substr($text, $i, 1); } return $chars; } /* * Remove terminal ANSI/control sequences from rendered text. */ private static function stripAnsi(string $text): string { return \preg_replace([self::ANSI_CSI_RX, self::ANSI_OSC_RX], '', $text) ?? $text; } }

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