<?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;

use function array_merge;
use function array_splice;
use function count;
use function fclose;
use function fopen;
use function fwrite;
use function is_bool;
use function is_int;
use function is_string;
use function max;
use function min;
use function sprintf;
use function stream_get_contents;
use function substr;
use SebastianBergmann\Diff\ConfigurationException;
use SebastianBergmann\Diff\Differ;

/**
 * Strict Unified diff output builder.
 *
 * Generates (strict) Unified diff's (unidiffs) with hunks.
 */
final class StrictUnifiedDiffOutputBuilder implements DiffOutputBuilderInterface
{
    private static $default = [
        'collapseRanges'      => true, // ranges of length one are rendered with the trailing `,1`
        'commonLineThreshold' => 6,    // number of same lines before ending a new hunk and creating a new one (if needed)
        'contextLines'        => 3,    // like `diff:  -u, -U NUM, --unified[=NUM]`, for patch/git apply compatibility best to keep at least @ 3
        'fromFile'            => null,
        'fromFileDate'        => null,
        'toFile'              => null,
        'toFileDate'          => null,
    ];

    /**
     * @var bool
     */
    private $changed;

    /**
     * @var bool
     */
    private $collapseRanges;

    /**
     * @var int >= 0
     */
    private $commonLineThreshold;

    /**
     * @var string
     */
    private $header;

    /**
     * @var int >= 0
     */
    private $contextLines;

    public function __construct(array $options = [])
    {
        $options = array_merge(self::$default, $options);

        if (!is_bool($options['collapseRanges'])) {
            throw new ConfigurationException('collapseRanges', 'a bool', $options['collapseRanges']);
        }

        if (!is_int($options['contextLines']) || $options['contextLines'] < 0) {
            throw new ConfigurationException('contextLines', 'an int >= 0', $options['contextLines']);
        }

        if (!is_int($options['commonLineThreshold']) || $options['commonLineThreshold'] <= 0) {
            throw new ConfigurationException('commonLineThreshold', 'an int > 0', $options['commonLineThreshold']);
        }

        $this->assertString($options, 'fromFile');
        $this->assertString($options, 'toFile');
        $this->assertStringOrNull($options, 'fromFileDate');
        $this->assertStringOrNull($options, 'toFileDate');

        $this->header = sprintf(
            "--- %s%s\n+++ %s%s\n",
            $options['fromFile'],
            null === $options['fromFileDate'] ? '' : "\t" . $options['fromFileDate'],
            $options['toFile'],
            null === $options['toFileDate'] ? '' : "\t" . $options['toFileDate']
        );

        $this->collapseRanges      = $options['collapseRanges'];
        $this->commonLineThreshold = $options['commonLineThreshold'];
        $this->contextLines        = $options['contextLines'];
    }

    public function getDiff(array $diff): string
    {
        if (0 === count($diff)) {
            return '';
        }

        $this->changed = false;

        $buffer = fopen('php://memory', 'r+b');
        fwrite($buffer, $this->header);

        $this->writeDiffHunks($buffer, $diff);

        if (!$this->changed) {
            fclose($buffer);

            return '';
        }

        $diff = stream_get_contents($buffer, -1, 0);

        fclose($buffer);

        // If the last char is not a linebreak: add it.
        // This might happen when both the `from` and `to` do not have a trailing linebreak
        $last = substr($diff, -1);

        return "\n" !== $last && "\r" !== $last
            ? $diff . "\n"
            : $diff;
    }

    private function writeDiffHunks($output, array $diff): void
    {
        // detect "No newline at end of file" and insert into `$diff` if needed

        $upperLimit = count($diff);

        if (0 === $diff[$upperLimit - 1][1]) {
            $lc = substr($diff[$upperLimit - 1][0], -1);

            if ("\n" !== $lc) {
                array_splice($diff, $upperLimit, 0, [["\n\\ No newline at end of file\n", Differ::NO_LINE_END_EOF_WARNING]]);
            }
        } else {
            // search back for the last `+` and `-` line,
            // check if has trailing linebreak, else add under it warning under it
            $toFind = [1 => true, 2 => true];

            for ($i = $upperLimit - 1; $i >= 0; --$i) {
                if (isset($toFind[$diff[$i][1]])) {
                    unset($toFind[$diff[$i][1]]);
                    $lc = substr($diff[$i][0], -1);

                    if ("\n" !== $lc) {
                        array_splice($diff, $i + 1, 0, [["\n\\ No newline at end of file\n", Differ::NO_LINE_END_EOF_WARNING]]);
                    }

                    if (!count($toFind)) {
                        break;
                    }
                }
            }
        }

        // write hunks to output buffer

        $cutOff      = max($this->commonLineThreshold, $this->contextLines);
        $hunkCapture = false;
        $sameCount   = $toRange = $fromRange = 0;
        $toStart     = $fromStart = 1;
        $i           = 0;

        /** @var int $i */
        foreach ($diff as $i => $entry) {
            if (0 === $entry[1]) { // same
                if (false === $hunkCapture) {
                    ++$fromStart;
                    ++$toStart;

                    continue;
                }

                ++$sameCount;
                ++$toRange;
                ++$fromRange;

                if ($sameCount === $cutOff) {
                    $contextStartOffset = ($hunkCapture - $this->contextLines) < 0
                        ? $hunkCapture
                        : $this->contextLines;

                    // note: $contextEndOffset = $this->contextLines;
                    //
                    // because we never go beyond the end of the diff.
                    // with the cutoff/contextlines here the follow is never true;
                    //
                    // if ($i - $cutOff + $this->contextLines + 1 > \count($diff)) {
                    //    $contextEndOffset = count($diff) - 1;
                    // }
                    //
                    // ; that would be true for a trailing incomplete hunk case which is dealt with after this loop

                    $this->writeHunk(
                        $diff,
                        $hunkCapture - $contextStartOffset,
                        $i - $cutOff + $this->contextLines + 1,
                        $fromStart - $contextStartOffset,
                        $fromRange - $cutOff + $contextStartOffset + $this->contextLines,
                        $toStart - $contextStartOffset,
                        $toRange - $cutOff + $contextStartOffset + $this->contextLines,
                        $output
                    );

                    $fromStart += $fromRange;
                    $toStart += $toRange;

                    $hunkCapture = false;
                    $sameCount   = $toRange = $fromRange = 0;
                }

                continue;
            }

            $sameCount = 0;

            if ($entry[1] === Differ::NO_LINE_END_EOF_WARNING) {
                continue;
            }

            $this->changed = true;

            if (false === $hunkCapture) {
                $hunkCapture = $i;
            }

            if (Differ::ADDED === $entry[1]) { // added
                ++$toRange;
            }

            if (Differ::REMOVED === $entry[1]) { // removed
                ++$fromRange;
            }
        }

        if (false === $hunkCapture) {
            return;
        }

        // we end here when cutoff (commonLineThreshold) was not reached, but we where capturing a hunk,
        // do not render hunk till end automatically because the number of context lines might be less than the commonLineThreshold

        $contextStartOffset = $hunkCapture - $this->contextLines < 0
            ? $hunkCapture
            : $this->contextLines;

        // prevent trying to write out more common lines than there are in the diff _and_
        // do not write more than configured through the context lines
        $contextEndOffset = min($sameCount, $this->contextLines);

        $fromRange -= $sameCount;
        $toRange -= $sameCount;

        $this->writeHunk(
            $diff,
            $hunkCapture - $contextStartOffset,
            $i - $sameCount + $contextEndOffset + 1,
            $fromStart - $contextStartOffset,
            $fromRange + $contextStartOffset + $contextEndOffset,
            $toStart - $contextStartOffset,
            $toRange + $contextStartOffset + $contextEndOffset,
            $output
        );
    }

    private function writeHunk(
        array $diff,
        int $diffStartIndex,
        int $diffEndIndex,
        int $fromStart,
        int $fromRange,
        int $toStart,
        int $toRange,
        $output
    ): void {
        fwrite($output, '@@ -' . $fromStart);

        if (!$this->collapseRanges || 1 !== $fromRange) {
            fwrite($output, ',' . $fromRange);
        }

        fwrite($output, ' +' . $toStart);

        if (!$this->collapseRanges || 1 !== $toRange) {
            fwrite($output, ',' . $toRange);
        }

        fwrite($output, " @@\n");

        for ($i = $diffStartIndex; $i < $diffEndIndex; ++$i) {
            if ($diff[$i][1] === Differ::ADDED) {
                $this->changed = true;
                fwrite($output, '+' . $diff[$i][0]);
            } elseif ($diff[$i][1] === Differ::REMOVED) {
                $this->changed = true;
                fwrite($output, '-' . $diff[$i][0]);
            } elseif ($diff[$i][1] === Differ::OLD) {
                fwrite($output, ' ' . $diff[$i][0]);
            } elseif ($diff[$i][1] === Differ::NO_LINE_END_EOF_WARNING) {
                $this->changed = true;
                fwrite($output, $diff[$i][0]);
            }
            //} elseif ($diff[$i][1] === Differ::DIFF_LINE_END_WARNING) { // custom comment inserted by PHPUnit/diff package
                //  skip
            //} else {
                //  unknown/invalid
            //}
        }
    }

    private function assertString(array $options, string $option): void
    {
        if (!is_string($options[$option])) {
            throw new ConfigurationException($option, 'a string', $options[$option]);
        }
    }

    private function assertStringOrNull(array $options, string $option): void
    {
        if (null !== $options[$option] && !is_string($options[$option])) {
            throw new ConfigurationException($option, 'a string or <null>', $options[$option]);
        }
    }
}

• [F] AbstractChunkOutputBuilder.php
  Delete
• [F] DiffOnlyOutputBuilder.php
  Delete
• [F] DiffOutputBuilderInterface.php
  Delete
• [F] StrictUnifiedDiffOutputBuilder.php
  Delete
• [F] UnifiedDiffOutputBuilder.php
  Delete

Service Section

Our Services: Streamlining Your Payment Experience with Excellence

Discover how our services are designed to enhance your NFC Pay experience with convenience, security, and innovative solutions. From managing transactions to secure payments, we are dedicated to providing seamless support every step of the way.

Secure Card Storage

Easily save your credit and debit card details within our app for quick and secure transactions. This feature ensures that your payment information is protected with advanced encryption and can be used for future purchases with just a tap.

Effortless Money Transfers

Transfer funds quickly and securely between users with our streamlined money transfer service. Simply select the recipient, enter the amount, and authorize the transaction for instant, hassle-free transfers.

Merchant Account Setup

Activate your merchant account effortlessly to start receiving payments. Our intuitive setup process ensures that you can begin accepting transactions smoothly, helping your business thrive with minimal setup time.

Real-Time Transaction Tracking

Keep track of all your transactions in real time through our app. Monitor payment statuses, view transaction history, and manage your account efficiently, ensuring complete control over your financial activities.

Customer Support

Our dedicated support team is available to assist you with any queries or issues. Whether you need help with setting up your account or resolving transaction-related questions, we’re here to provide prompt and reliable assistance.