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<?php |
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/** |
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* (c) Steve Nebes <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace SN\RangeDifferencer; |
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/** |
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* TextLineLCS |
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*/ |
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class TextLineLCS extends AbstractLCS |
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{ |
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/** @var TextLine[] */ |
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private $lines1 = []; |
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/** @var TextLine[] */ |
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private $lines2 = []; |
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/** @var TextLine[][] */ |
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private $lcs = []; |
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/** |
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* Default values. |
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* |
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* @param TextLine[] $lines1 |
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* @param TextLine[] $lines2 |
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*/ |
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public function __construct(array $lines1, array $lines2) |
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{ |
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$this->lines1 = $lines1; |
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$this->lines2 = $lines2; |
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} |
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/** |
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* @return TextLine[][] |
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*/ |
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public function getResult(): array |
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{ |
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$length = $this->getLength(); |
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$result = array_fill(0, 2, null); |
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if (0 === $length) { |
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return $result; |
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} |
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$result[0] = $this->compactAndShiftLCS($this->lcs[0], $length, $this->lines1); |
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$result[1] = $this->compactAndShiftLCS($this->lcs[1], $length, $this->lines2); |
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return $result; |
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} |
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/** |
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* @return int |
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*/ |
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protected function getLength1(): int |
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{ |
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return \count($this->lines1); |
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} |
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/** |
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* @return int |
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*/ |
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protected function getLength2(): int |
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{ |
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return \count($this->lines2); |
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} |
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/** |
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* @param int $i1 |
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* @param int $i2 |
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* @return bool |
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*/ |
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protected function isRangeEqual(int $i1, int $i2): bool |
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{ |
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return $this->lines1[$i1]->isSameText($this->lines2[$i2]); |
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} |
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/** |
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* @param int $sl1 |
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* @param int $sl2 |
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*/ |
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protected function setLcs(int $sl1, int $sl2): void |
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{ |
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$this->lcs[0][$sl1] = $this->lines1[$sl1]; |
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$this->lcs[1][$sl1] = $this->lines2[$sl2]; |
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} |
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/** |
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* @param int $lcsLength |
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*/ |
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protected function initializeLcs(int $lcsLength): void |
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{ |
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$this->lcs = array_fill(0, 2, array_fill(0, $lcsLength, null)); |
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} |
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/** |
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* @param TextLine[] $lcsSide |
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* @param int $len |
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* @param TextLine[] $original |
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* @return array |
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*/ |
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private function compactAndShiftLCS(array &$lcsSide, int $len, array &$original): array |
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{ |
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/** @var TextLine[] $result */ |
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$result = array_fill(0, $len, null); |
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if (0 === $len) { |
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return $result; |
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} |
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$j = 0; |
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while (null === $lcsSide[$j]) { |
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$j++; |
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} |
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$result[0] = $lcsSide[$j]; |
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$j++; |
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for ($i = 1; $i < $len; $i++) { |
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while (null === $lcsSide[$j]) { |
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$j++; |
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} |
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if ($original[$result[$i - 1]->getLineNumber() + 1]->isSameText($lcsSide[$j])) { |
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$result[$i] = $original[$result[$i - 1]->getLineNumber() + 1]; |
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} else { |
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$result[$i] = $lcsSide[$j]; |
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} |
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$j++; |
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} |
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return $result; |
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} |
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/** |
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* @param string $text |
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* @return TextLine[] |
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*/ |
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public static function getTextLines(string $text): array |
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{ |
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$lines = []; |
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$begin = 0; |
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$end = static::getEOL($text, 0); |
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$lineNum = 0; |
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while (-1 !== $end) { |
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$lines[] = new TextLine($lineNum++, \mb_substr($text, $begin, $end - $begin)); |
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$begin = $end + 1; |
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$end = static::getEOL($text, $begin); |
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if ($end === $begin && "\r" === \mb_substr($text, $begin - 1, 1) && "\n" === \mb_substr($text, $begin, 1)) { |
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// We have \r followed by \n, skip it. |
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$begin = $end + 1; |
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$end = static::getEOL($text, $begin); |
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} |
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} |
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$lines[] = new TextLine($lineNum, \mb_substr($text, $begin)); |
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return $lines; |
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} |
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/** |
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* @param string $text |
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* @param int $start |
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* @return int |
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*/ |
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private static function getEOL(string $text, int $start): int |
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{ |
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$max = \mb_strlen($text); |
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for ($i = $start; $i < $max; $i++) { |
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$c = \mb_substr($text, $i, 1); |
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if ("\n" === $c || "\r" === $c) { |
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return $i; |
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} |
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} |
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return -1; |
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} |
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} |
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snebes /
range-differencer
