Added Laravel project

This commit is contained in:
2017-09-17 00:35:10 +02:00
parent a3c19304d5
commit ecf605b8f5
6246 changed files with 682270 additions and 2 deletions

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
final class Chunk
{
/**
* @var int
*/
private $start;
/**
* @var int
*/
private $startRange;
/**
* @var int
*/
private $end;
/**
* @var int
*/
private $endRange;
/**
* @var array
*/
private $lines;
public function __construct(int $start = 0, int $startRange = 1, int $end = 0, int $endRange = 1, array $lines = [])
{
$this->start = $start;
$this->startRange = $startRange;
$this->end = $end;
$this->endRange = $endRange;
$this->lines = $lines;
}
public function getStart(): int
{
return $this->start;
}
public function getStartRange(): int
{
return $this->startRange;
}
public function getEnd(): int
{
return $this->end;
}
public function getEndRange(): int
{
return $this->endRange;
}
public function getLines(): array
{
return $this->lines;
}
public function setLines(array $lines)
{
$this->lines = $lines;
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
final class Diff
{
/**
* @var string
*/
private $from;
/**
* @var string
*/
private $to;
/**
* @var Chunk[]
*/
private $chunks;
/**
* @param string $from
* @param string $to
* @param Chunk[] $chunks
*/
public function __construct(string $from, string $to, array $chunks = [])
{
$this->from = $from;
$this->to = $to;
$this->chunks = $chunks;
}
public function getFrom(): string
{
return $this->from;
}
public function getTo(): string
{
return $this->to;
}
/**
* @return Chunk[]
*/
public function getChunks(): array
{
return $this->chunks;
}
/**
* @param Chunk[] $chunks
*/
public function setChunks(array $chunks)
{
$this->chunks = $chunks;
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
use SebastianBergmann\Diff\Output\DiffOutputBuilderInterface;
use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;
/**
* Diff implementation.
*/
final class Differ
{
/**
* @var DiffOutputBuilderInterface
*/
private $outputBuilder;
/**
* @param DiffOutputBuilderInterface $outputBuilder
*
* @throws InvalidArgumentException
*/
public function __construct($outputBuilder = null)
{
if ($outputBuilder instanceof DiffOutputBuilderInterface) {
$this->outputBuilder = $outputBuilder;
} elseif (null === $outputBuilder) {
$this->outputBuilder = new UnifiedDiffOutputBuilder;
} elseif (\is_string($outputBuilder)) {
// PHPUnit 6.1.4, 6.2.0, 6.2.1, 6.2.2, and 6.2.3 support
// @see https://github.com/sebastianbergmann/phpunit/issues/2734#issuecomment-314514056
// @deprecated
$this->outputBuilder = new UnifiedDiffOutputBuilder($outputBuilder);
} else {
throw new InvalidArgumentException(
\sprintf(
'Expected builder to be an instance of DiffOutputBuilderInterface, <null> or a string, got %s.',
\is_object($outputBuilder) ? 'instance of "' . \get_class($outputBuilder) . '"' : \gettype($outputBuilder) . ' "' . $outputBuilder . '"'
)
);
}
}
/**
* Returns the diff between two arrays or strings as string.
*
* @param array|string $from
* @param array|string $to
* @param LongestCommonSubsequenceCalculator|null $lcs
*
* @return string
*/
public function diff($from, $to, LongestCommonSubsequenceCalculator $lcs = null): string
{
$from = $this->validateDiffInput($from);
$to = $this->validateDiffInput($to);
$diff = $this->diffToArray($from, $to, $lcs);
return $this->outputBuilder->getDiff($diff);
}
/**
* Casts variable to string if it is not a string or array.
*
* @param mixed $input
*
* @return string
*/
private function validateDiffInput($input): string
{
if (!\is_array($input) && !\is_string($input)) {
return (string) $input;
}
return $input;
}
/**
* Returns the diff between two arrays or strings as array.
*
* Each array element contains two elements:
* - [0] => mixed $token
* - [1] => 2|1|0
*
* - 2: REMOVED: $token was removed from $from
* - 1: ADDED: $token was added to $from
* - 0: OLD: $token is not changed in $to
*
* @param array|string $from
* @param array|string $to
* @param LongestCommonSubsequenceCalculator $lcs
*
* @return array
*/
public function diffToArray($from, $to, LongestCommonSubsequenceCalculator $lcs = null): array
{
if (\is_string($from)) {
$from = $this->splitStringByLines($from);
} elseif (!\is_array($from)) {
throw new \InvalidArgumentException('"from" must be an array or string.');
}
if (\is_string($to)) {
$to = $this->splitStringByLines($to);
} elseif (!\is_array($to)) {
throw new \InvalidArgumentException('"to" must be an array or string.');
}
list($from, $to, $start, $end) = self::getArrayDiffParted($from, $to);
if ($lcs === null) {
$lcs = $this->selectLcsImplementation($from, $to);
}
$common = $lcs->calculate(\array_values($from), \array_values($to));
$diff = [];
foreach ($start as $token) {
$diff[] = [$token, 0 /* OLD */];
}
\reset($from);
\reset($to);
foreach ($common as $token) {
while (($fromToken = \reset($from)) !== $token) {
$diff[] = [\array_shift($from), 2 /* REMOVED */];
}
while (($toToken = \reset($to)) !== $token) {
$diff[] = [\array_shift($to), 1 /* ADDED */];
}
$diff[] = [$token, 0 /* OLD */];
\array_shift($from);
\array_shift($to);
}
while (($token = \array_shift($from)) !== null) {
$diff[] = [$token, 2 /* REMOVED */];
}
while (($token = \array_shift($to)) !== null) {
$diff[] = [$token, 1 /* ADDED */];
}
foreach ($end as $token) {
$diff[] = [$token, 0 /* OLD */];
}
if ($this->detectUnmatchedLineEndings($diff)) {
\array_unshift($diff, ["#Warning: Strings contain different line endings!\n", 3]);
}
return $diff;
}
/**
* Checks if input is string, if so it will split it line-by-line.
*
* @param string $input
*
* @return array
*/
private function splitStringByLines(string $input): array
{
return \preg_split('/(.*\R)/', $input, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
}
/**
* @param array $from
* @param array $to
*
* @return LongestCommonSubsequenceCalculator
*/
private function selectLcsImplementation(array $from, array $to): LongestCommonSubsequenceCalculator
{
// We do not want to use the time-efficient implementation if its memory
// footprint will probably exceed this value. Note that the footprint
// calculation is only an estimation for the matrix and the LCS method
// will typically allocate a bit more memory than this.
$memoryLimit = 100 * 1024 * 1024;
if ($this->calculateEstimatedFootprint($from, $to) > $memoryLimit) {
return new MemoryEfficientLongestCommonSubsequenceCalculator;
}
return new TimeEfficientLongestCommonSubsequenceCalculator;
}
/**
* Calculates the estimated memory footprint for the DP-based method.
*
* @param array $from
* @param array $to
*
* @return int|float
*/
private function calculateEstimatedFootprint(array $from, array $to)
{
$itemSize = PHP_INT_SIZE === 4 ? 76 : 144;
return $itemSize * \min(\count($from), \count($to)) ** 2;
}
/**
* Returns true if line ends don't match in a diff.
*
* @param array $diff
*
* @return bool
*/
private function detectUnmatchedLineEndings(array $diff): bool
{
$newLineBreaks = ['' => true];
$oldLineBreaks = ['' => true];
foreach ($diff as $entry) {
if (0 === $entry[1]) { /* OLD */
$ln = $this->getLinebreak($entry[0]);
$oldLineBreaks[$ln] = true;
$newLineBreaks[$ln] = true;
} elseif (1 === $entry[1]) { /* ADDED */
$newLineBreaks[$this->getLinebreak($entry[0])] = true;
} elseif (2 === $entry[1]) { /* REMOVED */
$oldLineBreaks[$this->getLinebreak($entry[0])] = true;
}
}
// if either input or output is a single line without breaks than no warning should be raised
if (['' => true] === $newLineBreaks || ['' => true] === $oldLineBreaks) {
return false;
}
// two way compare
foreach ($newLineBreaks as $break => $set) {
if (!isset($oldLineBreaks[$break])) {
return true;
}
}
foreach ($oldLineBreaks as $break => $set) {
if (!isset($newLineBreaks[$break])) {
return true;
}
}
return false;
}
private function getLinebreak($line): string
{
if (!\is_string($line)) {
return '';
}
$lc = \substr($line, -1);
if ("\r" === $lc) {
return "\r";
}
if ("\n" !== $lc) {
return '';
}
if ("\r\n" === \substr($line, -2)) {
return "\r\n";
}
return "\n";
}
private static function getArrayDiffParted(array &$from, array &$to): array
{
$start = [];
$end = [];
\reset($to);
foreach ($from as $k => $v) {
$toK = \key($to);
if ($toK === $k && $v === $to[$k]) {
$start[$k] = $v;
unset($from[$k], $to[$k]);
} else {
break;
}
}
\end($from);
\end($to);
do {
$fromK = \key($from);
$toK = \key($to);
if (null === $fromK || null === $toK || \current($from) !== \current($to)) {
break;
}
\prev($from);
\prev($to);
$end = [$fromK => $from[$fromK]] + $end;
unset($from[$fromK], $to[$toK]);
} while (true);
return [$from, $to, $start, $end];
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
interface Exception
{
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
class InvalidArgumentException extends \InvalidArgumentException implements Exception
{
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
final class Line
{
const ADDED = 1;
const REMOVED = 2;
const UNCHANGED = 3;
/**
* @var int
*/
private $type;
/**
* @var string
*/
private $content;
public function __construct(int $type = self::UNCHANGED, string $content = '')
{
$this->type = $type;
$this->content = $content;
}
public function getContent(): string
{
return $this->content;
}
public function getType(): int
{
return $this->type;
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
interface LongestCommonSubsequenceCalculator
{
/**
* Calculates the longest common subsequence of two arrays.
*
* @param array $from
* @param array $to
*
* @return array
*/
public function calculate(array $from, array $to): array;
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
final class MemoryEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
{
/**
* {@inheritdoc}
*/
public function calculate(array $from, array $to): array
{
$cFrom = \count($from);
$cTo = \count($to);
if ($cFrom === 0) {
return [];
}
if ($cFrom === 1) {
if (\in_array($from[0], $to, true)) {
return [$from[0]];
}
return [];
}
$i = (int) ($cFrom / 2);
$fromStart = \array_slice($from, 0, $i);
$fromEnd = \array_slice($from, $i);
$llB = $this->length($fromStart, $to);
$llE = $this->length(\array_reverse($fromEnd), \array_reverse($to));
$jMax = 0;
$max = 0;
for ($j = 0; $j <= $cTo; $j++) {
$m = $llB[$j] + $llE[$cTo - $j];
if ($m >= $max) {
$max = $m;
$jMax = $j;
}
}
$toStart = \array_slice($to, 0, $jMax);
$toEnd = \array_slice($to, $jMax);
return \array_merge(
$this->calculate($fromStart, $toStart),
$this->calculate($fromEnd, $toEnd)
);
}
private function length(array $from, array $to): array
{
$current = \array_fill(0, \count($to) + 1, 0);
$cFrom = \count($from);
$cTo = \count($to);
for ($i = 0; $i < $cFrom; $i++) {
$prev = $current;
for ($j = 0; $j < $cTo; $j++) {
if ($from[$i] === $to[$j]) {
$current[$j + 1] = $prev[$j] + 1;
} else {
$current[$j + 1] = \max($current[$j], $prev[$j + 1]);
}
}
}
return $current;
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff\Output;
abstract class AbstractChunkOutputBuilder implements DiffOutputBuilderInterface
{
/**
* Takes input of the diff array and returns the common parts.
* Iterates through diff line by line.
*
* @param array $diff
* @param int $lineThreshold
*
* @return array
*/
protected function getCommonChunks(array $diff, int $lineThreshold = 5): array
{
$diffSize = \count($diff);
$capturing = false;
$chunkStart = 0;
$chunkSize = 0;
$commonChunks = [];
for ($i = 0; $i < $diffSize; ++$i) {
if ($diff[$i][1] === 0 /* OLD */) {
if ($capturing === false) {
$capturing = true;
$chunkStart = $i;
$chunkSize = 0;
} else {
++$chunkSize;
}
} elseif ($capturing !== false) {
if ($chunkSize >= $lineThreshold) {
$commonChunks[$chunkStart] = $chunkStart + $chunkSize;
}
$capturing = false;
}
}
if ($capturing !== false && $chunkSize >= $lineThreshold) {
$commonChunks[$chunkStart] = $chunkStart + $chunkSize;
}
return $commonChunks;
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff\Output;
/**
* Builds a diff string representation in a loose unified diff format
* listing only changes lines. Does not include line numbers.
*/
final class DiffOnlyOutputBuilder implements DiffOutputBuilderInterface
{
/**
* @var string
*/
private $header;
public function __construct(string $header = "--- Original\n+++ New\n")
{
$this->header = $header;
}
public function getDiff(array $diff): string
{
$buffer = \fopen('php://memory', 'r+b');
if ('' !== $this->header) {
\fwrite($buffer, $this->header);
if ("\n" !== \substr($this->header, -1, 1)) {
\fwrite($buffer, "\n");
}
}
foreach ($diff as $diffEntry) {
if ($diffEntry[1] === 1 /* ADDED */) {
\fwrite($buffer, '+' . $diffEntry[0]);
} elseif ($diffEntry[1] === 2 /* REMOVED */) {
\fwrite($buffer, '-' . $diffEntry[0]);
} elseif ($diffEntry[1] === 3 /* WARNING */) {
\fwrite($buffer, ' ' . $diffEntry[0]);
continue; // Warnings should not be tested for line break, it will always be there
} else { /* Not changed (old) 0 */
continue; // we didn't write the non changs line, so do not add a line break either
}
$lc = \substr($diffEntry[0], -1);
if ($lc !== "\n" && $lc !== "\r") {
\fwrite($buffer, "\n"); // \No newline at end of file
}
}
$diff = \stream_get_contents($buffer, -1, 0);
\fclose($buffer);
return $diff;
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff\Output;
/**
* Defines how an output builder should take a generated
* diff array and return a string representation of that diff.
*/
interface DiffOutputBuilderInterface
{
public function getDiff(array $diff): string;
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff\Output;
/**
* Builds a diff string representation in unified diff format in chunks.
*/
final class UnifiedDiffOutputBuilder extends AbstractChunkOutputBuilder
{
/**
* @var string
*/
private $header;
/**
* @var bool
*/
private $addLineNumbers;
public function __construct(string $header = "--- Original\n+++ New\n", bool $addLineNumbers = false)
{
$this->header = $header;
$this->addLineNumbers = $addLineNumbers;
}
public function getDiff(array $diff): string
{
$buffer = \fopen('php://memory', 'r+b');
if ('' !== $this->header) {
\fwrite($buffer, $this->header);
if ("\n" !== \substr($this->header, -1, 1)) {
\fwrite($buffer, "\n");
}
}
$this->writeDiffChunked($buffer, $diff, $this->getCommonChunks($diff));
$diff = \stream_get_contents($buffer, -1, 0);
\fclose($buffer);
return $diff;
}
// `old` is an array with key => value pairs . Each pair represents a start and end index of `diff`
// of a list of elements all containing `same` (0) entries.
private function writeDiffChunked($output, array $diff, array $old)
{
$upperLimit = \count($diff);
$start = 0;
$fromStart = 0;
$toStart = 0;
if (\count($old)) { // no common parts, list all diff entries
\reset($old);
// iterate the diff, go from chunk to chunk skipping common chunk of lines between those
do {
$commonStart = \key($old);
$commonEnd = \current($old);
if ($commonStart !== $start) {
list($fromRange, $toRange) = $this->getChunkRange($diff, $start, $commonStart);
$this->writeChunk($output, $diff, $start, $commonStart, $fromStart, $fromRange, $toStart, $toRange);
$fromStart += $fromRange;
$toStart += $toRange;
}
$start = $commonEnd + 1;
$commonLength = $commonEnd - $commonStart + 1; // calculate number of non-change lines in the common part
$fromStart += $commonLength;
$toStart += $commonLength;
} while (false !== \next($old));
\end($old); // short cut for finding possible last `change entry`
$tmp = \key($old);
\reset($old);
if ($old[$tmp] === $upperLimit - 1) {
$upperLimit = $tmp;
}
}
if ($start < $upperLimit - 1) { // check for trailing (non) diff entries
do {
--$upperLimit;
} while (isset($diff[$upperLimit][1]) && $diff[$upperLimit][1] === 0);
++$upperLimit;
list($fromRange, $toRange) = $this->getChunkRange($diff, $start, $upperLimit);
$this->writeChunk($output, $diff, $start, $upperLimit, $fromStart, $fromRange, $toStart, $toRange);
}
}
private function writeChunk(
$output,
array $diff,
int $diffStartIndex,
int $diffEndIndex,
int $fromStart,
int $fromRange,
int $toStart,
int $toRange
) {
if ($this->addLineNumbers) {
\fwrite($output, '@@ -' . (1 + $fromStart));
if ($fromRange > 1) {
\fwrite($output, ',' . $fromRange);
}
\fwrite($output, ' +' . (1 + $toStart));
if ($toRange > 1) {
\fwrite($output, ',' . $toRange);
}
\fwrite($output, " @@\n");
} else {
\fwrite($output, "@@ @@\n");
}
for ($i = $diffStartIndex; $i < $diffEndIndex; ++$i) {
if ($diff[$i][1] === 1 /* ADDED */) {
\fwrite($output, '+' . $diff[$i][0]);
} elseif ($diff[$i][1] === 2 /* REMOVED */) {
\fwrite($output, '-' . $diff[$i][0]);
} else { /* Not changed (old) 0 or Warning 3 */
\fwrite($output, ' ' . $diff[$i][0]);
}
$lc = \substr($diff[$i][0], -1);
if ($lc !== "\n" && $lc !== "\r") {
\fwrite($output, "\n"); // \No newline at end of file
}
}
}
private function getChunkRange(array $diff, int $diffStartIndex, int $diffEndIndex): array
{
$toRange = 0;
$fromRange = 0;
for ($i = $diffStartIndex; $i < $diffEndIndex; ++$i) {
if ($diff[$i][1] === 1) { // added
++$toRange;
} elseif ($diff[$i][1] === 2) { // removed
++$fromRange;
} elseif ($diff[$i][1] === 0) { // same
++$fromRange;
++$toRange;
}
}
return [$fromRange, $toRange];
}
}

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<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
/**
* Unified diff parser.
*/
final class Parser
{
/**
* @param string $string
*
* @return Diff[]
*/
public function parse(string $string): array
{
$lines = \preg_split('(\r\n|\r|\n)', $string);
if (!empty($lines) && $lines[\count($lines) - 1] === '') {
\array_pop($lines);
}
$lineCount = \count($lines);
$diffs = [];
$diff = null;
$collected = [];
for ($i = 0; $i < $lineCount; ++$i) {
if (\preg_match('(^---\\s+(?P<file>\\S+))', $lines[$i], $fromMatch) &&
\preg_match('(^\\+\\+\\+\\s+(?P<file>\\S+))', $lines[$i + 1], $toMatch)) {
if ($diff !== null) {
$this->parseFileDiff($diff, $collected);
$diffs[] = $diff;
$collected = [];
}
$diff = new Diff($fromMatch['file'], $toMatch['file']);
++$i;
} else {
if (\preg_match('/^(?:diff --git |index [\da-f\.]+|[+-]{3} [ab])/', $lines[$i])) {
continue;
}
$collected[] = $lines[$i];
}
}
if ($diff !== null && \count($collected)) {
$this->parseFileDiff($diff, $collected);
$diffs[] = $diff;
}
return $diffs;
}
private function parseFileDiff(Diff $diff, array $lines)
{
$chunks = [];
$chunk = null;
foreach ($lines as $line) {
if (\preg_match('/^@@\s+-(?P<start>\d+)(?:,\s*(?P<startrange>\d+))?\s+\+(?P<end>\d+)(?:,\s*(?P<endrange>\d+))?\s+@@/', $line, $match)) {
$chunk = new Chunk(
(int) $match['start'],
isset($match['startrange']) ? \max(1, (int) $match['startrange']) : 1,
(int) $match['end'],
isset($match['endrange']) ? \max(1, (int) $match['endrange']) : 1
);
$chunks[] = $chunk;
$diffLines = [];
continue;
}
if (\preg_match('/^(?P<type>[+ -])?(?P<line>.*)/', $line, $match)) {
$type = Line::UNCHANGED;
if ($match['type'] === '+') {
$type = Line::ADDED;
} elseif ($match['type'] === '-') {
$type = Line::REMOVED;
}
$diffLines[] = new Line($type, $match['line']);
if (null !== $chunk) {
$chunk->setLines($diffLines);
}
}
}
$diff->setChunks($chunks);
}
}

View File

@@ -0,0 +1,66 @@
<?php declare(strict_types=1);
/*
* This file is part of sebastian/diff.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\Diff;
final class TimeEfficientLongestCommonSubsequenceCalculator implements LongestCommonSubsequenceCalculator
{
/**
* {@inheritdoc}
*/
public function calculate(array $from, array $to): array
{
$common = [];
$fromLength = \count($from);
$toLength = \count($to);
$width = $fromLength + 1;
$matrix = new \SplFixedArray($width * ($toLength + 1));
for ($i = 0; $i <= $fromLength; ++$i) {
$matrix[$i] = 0;
}
for ($j = 0; $j <= $toLength; ++$j) {
$matrix[$j * $width] = 0;
}
for ($i = 1; $i <= $fromLength; ++$i) {
for ($j = 1; $j <= $toLength; ++$j) {
$o = ($j * $width) + $i;
$matrix[$o] = \max(
$matrix[$o - 1],
$matrix[$o - $width],
$from[$i - 1] === $to[$j - 1] ? $matrix[$o - $width - 1] + 1 : 0
);
}
}
$i = $fromLength;
$j = $toLength;
while ($i > 0 && $j > 0) {
if ($from[$i - 1] === $to[$j - 1]) {
$common[] = $from[$i - 1];
--$i;
--$j;
} else {
$o = ($j * $width) + $i;
if ($matrix[$o - $width] > $matrix[$o - 1]) {
--$j;
} else {
--$i;
}
}
}
return \array_reverse($common);
}
}