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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\Utils;
trait UnifiedDiffAssertTrait
{
/**
* @param string $diff
*
* @throws \UnexpectedValueException
*/
public function assertValidUnifiedDiffFormat(string $diff): void
{
if ('' === $diff) {
$this->addToAssertionCount(1);
return;
}
// test diff ends with a line break
$last = \substr($diff, -1);
if ("\n" !== $last && "\r" !== $last) {
throw new \UnexpectedValueException(\sprintf('Expected diff to end with a line break, got "%s".', $last));
}
$lines = \preg_split('/(.*\R)/', $diff, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
$lineCount = \count($lines);
$lineNumber = $diffLineFromNumber = $diffLineToNumber = 1;
$fromStart = $fromTillOffset = $toStart = $toTillOffset = -1;
$expectHunkHeader = true;
// check for header
if ($lineCount > 1) {
$this->unifiedDiffAssertLinePrefix($lines[0], 'Line 1.');
$this->unifiedDiffAssertLinePrefix($lines[1], 'Line 2.');
if ('---' === \substr($lines[0], 0, 3)) {
if ('+++' !== \substr($lines[1], 0, 3)) {
throw new \UnexpectedValueException(\sprintf("Line 1 indicates a header, so line 2 must start with \"+++\".\nLine 1: \"%s\"\nLine 2: \"%s\".", $lines[0], $lines[1]));
}
$this->unifiedDiffAssertHeaderLine($lines[0], '--- ', 'Line 1.');
$this->unifiedDiffAssertHeaderLine($lines[1], '+++ ', 'Line 2.');
$lineNumber = 3;
}
}
$endOfLineTypes = [];
$diffClosed = false;
// assert format of lines, get all hunks, test the line numbers
for (; $lineNumber <= $lineCount; ++$lineNumber) {
if ($diffClosed) {
throw new \UnexpectedValueException(\sprintf('Unexpected line as 2 "No newline" markers have found, ". Line %d.', $lineNumber));
}
$line = $lines[$lineNumber - 1]; // line numbers start by 1, array index at 0
$type = $this->unifiedDiffAssertLinePrefix($line, \sprintf('Line %d.', $lineNumber));
if ($expectHunkHeader && '@' !== $type && '\\' !== $type) {
throw new \UnexpectedValueException(\sprintf('Expected hunk start (\'@\'), got "%s". Line %d.', $type, $lineNumber));
}
if ('@' === $type) {
if (!$expectHunkHeader) {
throw new \UnexpectedValueException(\sprintf('Unexpected hunk start (\'@\'). Line %d.', $lineNumber));
}
$previousHunkFromEnd = $fromStart + $fromTillOffset;
$previousHunkTillEnd = $toStart + $toTillOffset;
[$fromStart, $fromTillOffset, $toStart, $toTillOffset] = $this->unifiedDiffAssertHunkHeader($line, \sprintf('Line %d.', $lineNumber));
// detect overlapping hunks
if ($fromStart < $previousHunkFromEnd) {
throw new \UnexpectedValueException(\sprintf('Unexpected new hunk; "from" (\'-\') start overlaps previous hunk. Line %d.', $lineNumber));
}
if ($toStart < $previousHunkTillEnd) {
throw new \UnexpectedValueException(\sprintf('Unexpected new hunk; "to" (\'+\') start overlaps previous hunk. Line %d.', $lineNumber));
}
/* valid states; hunks touches against each other:
$fromStart === $previousHunkFromEnd
$toStart === $previousHunkTillEnd
*/
$diffLineFromNumber = $fromStart;
$diffLineToNumber = $toStart;
$expectHunkHeader = false;
continue;
}
if ('-' === $type) {
if (isset($endOfLineTypes['-'])) {
throw new \UnexpectedValueException(\sprintf('Not expected from (\'-\'), already closed by "\\ No newline at end of file". Line %d.', $lineNumber));
}
++$diffLineFromNumber;
} elseif ('+' === $type) {
if (isset($endOfLineTypes['+'])) {
throw new \UnexpectedValueException(\sprintf('Not expected to (\'+\'), already closed by "\\ No newline at end of file". Line %d.', $lineNumber));
}
++$diffLineToNumber;
} elseif (' ' === $type) {
if (isset($endOfLineTypes['-'])) {
throw new \UnexpectedValueException(\sprintf('Not expected same (\' \'), \'-\' already closed by "\\ No newline at end of file". Line %d.', $lineNumber));
}
if (isset($endOfLineTypes['+'])) {
throw new \UnexpectedValueException(\sprintf('Not expected same (\' \'), \'+\' already closed by "\\ No newline at end of file". Line %d.', $lineNumber));
}
++$diffLineFromNumber;
++$diffLineToNumber;
} elseif ('\\' === $type) {
if (!isset($lines[$lineNumber - 2])) {
throw new \UnexpectedValueException(\sprintf('Unexpected "\\ No newline at end of file", it must be preceded by \'+\' or \'-\' line. Line %d.', $lineNumber));
}
$previousType = $this->unifiedDiffAssertLinePrefix($lines[$lineNumber - 2], \sprintf('Preceding line of "\\ No newline at end of file" of unexpected format. Line %d.', $lineNumber));
if (isset($endOfLineTypes[$previousType])) {
throw new \UnexpectedValueException(\sprintf('Unexpected "\\ No newline at end of file", "%s" was already closed. Line %d.', $type, $lineNumber));
}
$endOfLineTypes[$previousType] = true;
$diffClosed = \count($endOfLineTypes) > 1;
} else {
// internal state error
throw new \RuntimeException(\sprintf('Unexpected line type "%s" Line %d.', $type, $lineNumber));
}
$expectHunkHeader =
$diffLineFromNumber === ($fromStart + $fromTillOffset)
&& $diffLineToNumber === ($toStart + $toTillOffset)
;
}
if (
$diffLineFromNumber !== ($fromStart + $fromTillOffset)
&& $diffLineToNumber !== ($toStart + $toTillOffset)
) {
throw new \UnexpectedValueException(\sprintf('Unexpected EOF, number of lines in hunk "from" (\'-\')) and "to" (\'+\') mismatched. Line %d.', $lineNumber));
}
if ($diffLineFromNumber !== ($fromStart + $fromTillOffset)) {
throw new \UnexpectedValueException(\sprintf('Unexpected EOF, number of lines in hunk "from" (\'-\')) mismatched. Line %d.', $lineNumber));
}
if ($diffLineToNumber !== ($toStart + $toTillOffset)) {
throw new \UnexpectedValueException(\sprintf('Unexpected EOF, number of lines in hunk "to" (\'+\')) mismatched. Line %d.', $lineNumber));
}
$this->addToAssertionCount(1);
}
/**
* @param string $line
* @param string $message
*
* @return string '+', '-', '@', ' ' or '\'
*/
private function unifiedDiffAssertLinePrefix(string $line, string $message): string
{
$this->unifiedDiffAssertStrLength($line, 2, $message); // 2: line type indicator ('+', '-', ' ' or '\') and a line break
$firstChar = $line[0];
if ('+' === $firstChar || '-' === $firstChar || '@' === $firstChar || ' ' === $firstChar) {
return $firstChar;
}
if ("\\ No newline at end of file\n" === $line) {
return '\\';
}
throw new \UnexpectedValueException(\sprintf('Expected line to start with \'@\', \'-\' or \'+\', got "%s". %s', $line, $message));
}
private function unifiedDiffAssertStrLength(string $line, int $min, string $message): void
{
$length = \strlen($line);
if ($length < $min) {
throw new \UnexpectedValueException(\sprintf('Expected string length of minimal %d, got %d. %s', $min, $length, $message));
}
}
/**
* Assert valid unified diff header line
*
* Samples:
* - "+++ from1.txt\t2017-08-24 19:51:29.383985722 +0200"
* - "+++ from1.txt"
*
* @param string $line
* @param string $start
* @param string $message
*/
private function unifiedDiffAssertHeaderLine(string $line, string $start, string $message): void
{
if (0 !== \strpos($line, $start)) {
throw new \UnexpectedValueException(\sprintf('Expected header line to start with "%s", got "%s". %s', $start . ' ', $line, $message));
}
// sample "+++ from1.txt\t2017-08-24 19:51:29.383985722 +0200\n"
$match = \preg_match(
"/^([^\t]*)(?:[\t]([\\S].*[\\S]))?\n$/",
\substr($line, 4), // 4 === string length of "+++ " / "--- "
$matches
);
if (1 !== $match) {
throw new \UnexpectedValueException(\sprintf('Header line does not match expected pattern, got "%s". %s', $line, $message));
}
// $file = $matches[1];
if (\count($matches) > 2) {
$this->unifiedDiffAssertHeaderDate($matches[2], $message);
}
}
private function unifiedDiffAssertHeaderDate(string $date, string $message): void
{
// sample "2017-08-24 19:51:29.383985722 +0200"
$match = \preg_match(
'/^([\d]{4})-([01]?[\d])-([0123]?[\d])(:? [\d]{1,2}:[\d]{1,2}(?::[\d]{1,2}(:?\.[\d]+)?)?(?: ([\+\-][\d]{4}))?)?$/',
$date,
$matches
);
if (1 !== $match || ($matchesCount = \count($matches)) < 4) {
throw new \UnexpectedValueException(\sprintf('Date of header line does not match expected pattern, got "%s". %s', $date, $message));
}
// [$full, $year, $month, $day, $time] = $matches;
}
/**
* @param string $line
* @param string $message
*
* @return int[]
*/
private function unifiedDiffAssertHunkHeader(string $line, string $message): array
{
if (1 !== \preg_match('#^@@ -([\d]+)((?:,[\d]+)?) \+([\d]+)((?:,[\d]+)?) @@\n$#', $line, $matches)) {
throw new \UnexpectedValueException(
\sprintf(
'Hunk header line does not match expected pattern, got "%s". %s',
$line,
$message
)
);
}
return [
(int) $matches[1],
empty($matches[2]) ? 1 : (int) \substr($matches[2], 1),
(int) $matches[3],
empty($matches[4]) ? 1 : (int) \substr($matches[4], 1),
];
}
}