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<?php /** * SCSSPHP * * @copyright 2012-2020 Leaf Corcoran * * @license http://opensource.org/licenses/MIT MIT * * @link http://scssphp.github.io/scssphp / namespace ScssPhp\ScssPhp\Parser; use ScssPhp\ScssPhp\Ast\Sass\Expression; use ScssPhp\ScssPhp\Ast\Sass\Interpolation; use ScssPhp\ScssPhp\Util\Character; use ScssPhp\ScssPhp\Util\IterableUtil; use SourceSpan\FileLocation; use SourceSpan\FileSpan; use SourceSpan\SourceLocation; /* * A class that can map locations in a string generated from an {@see Interpolation} * to the original source code in the interpolation. * * @internal / final class InterpolationMap { private readonly Interpolation $interpolation; /* * Locations in the generated string. * * Each of these indicates the location in the generated string that * corresponds to the end of the component at the same index of * {@see $interpolation->getContents()}. Its length is always one less than * {@see $interpolation->getContents()} because the last element always ends the string. * * @var list<SourceLocation> / private readonly array $targetLocations; /* * @param list<SourceLocation> $targetLocations / public function __construct(Interpolation $interpolation, array $targetLocations) { $this->interpolation = $interpolation; $this->targetLocations = $targetLocations; $expectedLocations = max(0, \count($interpolation->getContents()) - 1); if (\count($targetLocations) !== $expectedLocations) { $interpolationParts = \count($interpolation->getContents()); throw new \InvalidArgumentException("InterpolationMap must have $expectedLocations targetLocations if the interpolation has $interpolationParts components."); } } public function mapException(FormatException $error): FormatException { if (\count($this->interpolation->getContents()) === 0) { return new FormatException($error->getMessage(), $this->interpolation->getSpan(), $error); } $target = $error->getSpan(); $source = $this->mapSpan($target); $startIndex = $this->indexInContents($target->getStart()); $endIndex = $this->indexInContents($target->getEnd()); if (!IterableUtil::any(array_slice($this->interpolation->getContents(), $startIndex, $endIndex - $startIndex + 1), fn ($content) => $content instanceof Expression)) { return new FormatException($error->getMessage(), $source, $error); } return new MultiSourceFormatException($error->getMessage(), $source, '', ['error in interpolated output' => $target], $error); } public function mapSpan(FileSpan $target): FileSpan { $start = $this->mapLocation($target->getStart()); $end = $this->mapLocation($target->getEnd()); if ($start instanceof FileSpan) { if ($end instanceof FileSpan) { return $start->expand($end); } return $this->interpolation->getSpan()->getFile()->span($this->expandInterpolationSpanLeft($start->getStart()), $end->getOffset()); } if ($end instanceof FileSpan) { return $this->interpolation->getSpan()->getFile()->span($start->getOffset(), $this->expandInterpolationSpanRight($end->getEnd())); } return $this->interpolation->getSpan()->getFile()->span($start->getOffset(), $end->getOffset()); } /* * @return FileSpan\|FileLocation / private function mapLocation(SourceLocation $target): object { if (\count($this->interpolation->getContents()) === 0) { return $this->interpolation->getSpan(); } $index = $this->indexInContents($target); $components = $this->interpolation->getContents(); if ($components[$index] instanceof Expression) { return $components[$index]->getSpan(); } if ($index === 0) { $previousLocation = $this->interpolation->getSpan()->getStart(); } else { $previousComponent = $components[$index - 1]; \assert($previousComponent instanceof Expression); $previousLocation = $this->interpolation->getSpan()->getFile()->location($this->expandInterpolationSpanRight($previousComponent->getSpan()->getEnd())); } $offsetInString = $target->getOffset() - ($index === 0 ? 0 : $this->targetLocations[$index - 1]->getOffset()); return $previousLocation->getFile()->location($previousLocation->getOffset() + $offsetInString); } /* * @return int<0, max> / private function indexInContents(SourceLocation $target): int { foreach ($this->targetLocations as $i => $location) { if ($target->getOffset() < $location->getOffset()) { return $i; } } \assert(\count($this->interpolation->getContents()) > 0); return \count($this->interpolation->getContents()) - 1; } /* * Given the start of a {@see FileSpan} covering an interpolated expression, returns * the offset of the interpolation's opening `#`. * * Note that this can be tricked by a `#{` that appears within a single-line * comment before the expression, but since it's only used for error * reporting that's probably fine. / private function expandInterpolationSpanLeft(FileLocation $start): int { $source = $start->getFile()->getString(); $i = $start->getOffset() - 1; while ($i >= 0) { $prev = $source[$i--]; if ($prev === '{') { if ($source[$i] === '#') { break; } } elseif ($prev === '/') { $second = $source[$i--]; if ($second === '') { while ($i >= 0) { $char = $source[$i--]; if ($char !== '') { continue; } do { $char = $source[$i--]; } while ($char === '' && $i >= 0); if ($char === '/') { break; } } } } } return $i; } /** * Given the end of a {@see FileSpan} covering an interpolated expression, returns * the offset of the interpolation's closing `}`. / private function expandInterpolationSpanRight(FileLocation $end): int { $source = $end->getFile()->getString(); $i = $end->getOffset(); while ($i < \strlen($source)) { $next = $source[$i++]; if ($next === '}') { break; } if ($next === '/') { $second = $source[$i++]; if ($second === '/') { while (!Character::isNewline($source[$i++] ?? null)) { // Move forward } } elseif ($second === '') { while (true) { $char = $source[$i++] ?? null; if ($char !== '') { continue; } do { $char = $source[$i++] ?? null; } while ($char === ''); if ($char === '/') { break; } } } } } return $i; } }

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