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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Yaml; use Symfony\Component\Yaml\Exception\ParseException; use Symfony\Component\Yaml\Tag\TaggedValue; /** * Parser parses YAML strings to convert them to PHP arrays. * * @author Fabien Potencier <fabien@symfony.com> * * @final */ class Parser { public const TAG_PATTERN = '(?P<tag>![\w!.\/:-]+)'; public const BLOCK_SCALAR_HEADER_PATTERN = '(?P<separator>\||>)(?P<modifiers>\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P<comments> +#.*)?'; public const REFERENCE_PATTERN = '#^&(?P<ref>[^ ]++) *+(?P<value>.*)#u'; private ?string $filename = null; private int $offset = 0; private int $numberOfParsedLines = 0; private ?int $totalNumberOfLines = null; private array $lines = []; private int $currentLineNb = -1; private string $currentLine = ''; private array $refs = []; private array $skippedLineNumbers = []; private array $locallySkippedLineNumbers = []; private array $refsBeingParsed = []; /** * Parses a YAML file into a PHP value. * * @param string $filename The path to the YAML file to be parsed * @param int-mask-of<Yaml::PARSE_*> $flags A bit field of Yaml::PARSE_* constants to customize the YAML parser behavior * * @throws ParseException If the file could not be read or the YAML is not valid */ public function parseFile(string $filename, int $flags = 0): mixed { if (!is_file($filename)) { throw new ParseException(\sprintf('File "%s" does not exist.', $filename)); } if (!is_readable($filename)) { throw new ParseException(\sprintf('File "%s" cannot be read.', $filename)); } $this->filename = $filename; try { return $this->parse(file_get_contents($filename), $flags); } finally { $this->filename = null; } } /** * Parses a YAML string to a PHP value. * * @param string $value A YAML string * @param int-mask-of<Yaml::PARSE_*> $flags A bit field of Yaml::PARSE_* constants to customize the YAML parser behavior * * @throws ParseException If the YAML is not valid */ public function parse(string $value, int $flags = 0): mixed { if (false === preg_match('//u', $value)) { throw new ParseException('The YAML value does not appear to be valid UTF-8.', -1, null, $this->filename); } $this->refs = []; try { $data = $this->doParse($value, $flags); } finally { $this->refsBeingParsed = []; $this->offset = 0; $this->lines = []; $this->currentLine = ''; $this->numberOfParsedLines = 0; $this->refs = []; $this->skippedLineNumbers = []; $this->locallySkippedLineNumbers = []; $this->totalNumberOfLines = null; } return $data; } private function doParse(string $value, int $flags): mixed { $this->currentLineNb = -1; $this->currentLine = ''; $value = $this->cleanup($value); $this->lines = explode("\n", $value); $this->numberOfParsedLines = \count($this->lines); $this->locallySkippedLineNumbers = []; $this->totalNumberOfLines ??= $this->numberOfParsedLines; if (!$this->moveToNextLine()) { return null; } $data = []; $context = null; $allowOverwrite = false; while ($this->isCurrentLineEmpty()) { if (!$this->moveToNextLine()) { return null; } } // Resolves the tag and returns if end of the document if (null !== ($tag = $this->getLineTag($this->currentLine, $flags, false)) && !$this->moveToNextLine()) { return new TaggedValue($tag, ''); } do { if ($this->isCurrentLineEmpty()) { continue; } // tab? if ("\t" === $this->currentLine[0]) { throw new ParseException('A YAML file cannot contain tabs as indentation.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } Inline::initialize($flags, $this->getRealCurrentLineNb(), $this->filename); $isRef = $mergeNode = false; if ('-' === $this->currentLine[0] && self::preg_match('#^\-((?P<leadspaces>\s+)(?P<value>.+))?$#u', rtrim($this->currentLine), $values)) { if ($context && 'mapping' == $context) { throw new ParseException('You cannot define a sequence item when in a mapping.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } $context = 'sequence'; if (isset($values['value']) && '&' === $values['value'][0] && self::preg_match(self::REFERENCE_PATTERN, $values['value'], $matches)) { $isRef = $matches['ref']; $this->refsBeingParsed[] = $isRef; $values['value'] = $matches['value']; } if (isset($values['value'][1]) && '?' === $values['value'][0] && ' ' === $values['value'][1]) { throw new ParseException('Complex mappings are not supported.', $this->getRealCurrentLineNb() + 1, $this->currentLine); } // array if (isset($values['value']) && str_starts_with(ltrim($values['value'], ' '), '-')) { // Inline first child $currentLineNumber = $this->getRealCurrentLineNb(); $sequenceIndentation = \strlen($values['leadspaces']) + 1; $sequenceYaml = substr($this->currentLine, $sequenceIndentation); $sequenceYaml .= "\n".$this->getNextEmbedBlock($sequenceIndentation, true); $data[] = $this->parseBlock($currentLineNumber, rtrim($sequenceYaml), $flags); } elseif (!isset($values['value']) || '' == trim($values['value'], ' ') || str_starts_with(ltrim($values['value'], ' '), '#')) { $data[] = $this->parseBlock($this->getRealCurrentLineNb() + 1, $this->getNextEmbedBlock(null, true) ?? '', $flags); } elseif (null !== $subTag = $this->getLineTag(ltrim($values['value'], ' '), $flags)) { $data[] = new TaggedValue( $subTag, $this->parseBlock($this->getRealCurrentLineNb() + 1, $this->getNextEmbedBlock(null, true), $flags) ); } else { if ( isset($values['leadspaces']) && ( '!' === $values['value'][0] || self::preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\{\[].*?) *\:(\s+(?P<value>.+?))?\s*$#u', $this->trimTag($values['value']), $matches) ) ) { $block = $values['value']; if ($this->isNextLineIndented() || isset($matches['value']) && '>-' === $matches['value']) { $block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + \strlen($values['leadspaces']) + 1); } $data[] = $this->parseBlock($this->getRealCurrentLineNb(), $block, $flags); } else { $data[] = $this->parseValue($values['value'], $flags, $context); } } if ($isRef) { $this->refs[$isRef] = end($data); array_pop($this->refsBeingParsed); } } elseif ( self::preg_match('#^(?P<key>(?:![^\s]++\s++)?(?:'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\[\{!].*?)) *\:(( |\t)++(?P<value>.+))?$#u', rtrim($this->currentLine), $values) && (!str_contains($values['key'], ' #') || \in_array($values['key'][0], ['"', "'"])) ) { if ($context && 'sequence' == $context) { throw new ParseException('You cannot define a mapping item when in a sequence.', $this->currentLineNb + 1, $this->currentLine, $this->filename); } $context = 'mapping'; try { $key = Inline::parseScalar($values['key']); } catch (ParseException $e) { $e->setParsedLine($this->getRealCurrentLineNb() + 1); $e->setSnippet($this->currentLine); throw $e; } if (!\is_string($key) && !\is_int($key)) { throw new ParseException((is_numeric($key) ? 'Numeric' : 'Non-string').' keys are not supported. Quote your evaluable mapping keys instead.', $this->getRealCurrentLineNb() + 1, $this->currentLine); } // Convert float keys to strings, to avoid being converted to integers by PHP if (\is_float($key)) { $key = (string) $key; } if ('<<' === $key && (!isset($values['value']) || '&' !== $values['value'][0] || !self::preg_match('#^&(?P<ref>[^ ]+)#u', $values['value'], $refMatches))) { $mergeNode = true; $allowOverwrite = true; if (isset($values['value'][0]) && '*' === $values['value'][0]) { $refName = substr(rtrim($values['value']), 1); if (!\array_key_exists($refName, $this->refs)) { if (false !== $pos = array_search($refName, $this->refsBeingParsed, true)) { throw new ParseException(\sprintf('Circular reference [%s] detected for reference "%s".', implode(', ', array_merge(\array_slice($this->refsBeingParsed, $pos), [$refName])), $refName), $this->currentLineNb + 1, $this->currentLine, $this->filename); } throw new ParseException(\sprintf('Reference "%s" does not exist.', $refName), $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } $refValue = $this->refs[$refName]; if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && $refValue instanceof \stdClass) { $refValue = (array) $refValue; } if (!\is_array($refValue)) { throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } $data += $refValue; // array union } else { if (isset($values['value']) && '' !== $values['value']) { $value = $values['value']; } else { $value = $this->getNextEmbedBlock(); } $parsed = $this->parseBlock($this->getRealCurrentLineNb() + 1, $value, $flags); if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && $parsed instanceof \stdClass) { $parsed = (array) $parsed; } if (!\is_array($parsed)) { throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } if (isset($parsed[0])) { // If the value associated with the merge key is a sequence, then this sequence is expected to contain mapping nodes // and each of these nodes is merged in turn according to its order in the sequence. Keys in mapping nodes earlier // in the sequence override keys specified in later mapping nodes. foreach ($parsed as $parsedItem) { if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && $parsedItem instanceof \stdClass) { $parsedItem = (array) $parsedItem; } if (!\is_array($parsedItem)) { throw new ParseException('Merge items must be arrays.', $this->getRealCurrentLineNb() + 1, $parsedItem, $this->filename); } $data += $parsedItem; // array union } } else { // If the value associated with the key is a single mapping node, each of its key/value pairs is inserted into the // current mapping, unless the key already exists in it. $data += $parsed; // array union } } } elseif ('<<' !== $key && isset($values['value']) && '&' === $values['value'][0] && self::preg_match(self::REFERENCE_PATTERN, $values['value'], $matches)) { $isRef = $matches['ref']; $this->refsBeingParsed[] = $isRef; $values['value'] = $matches['value']; } $subTag = null; if ($mergeNode) { // Merge keys } elseif (!isset($values['value']) || '' === $values['value'] || str_starts_with($values['value'], '#') || (null !== $subTag = $this->getLineTag($values['value'], $flags)) || '<<' === $key) { // hash // if next line is less indented or equal, then it means that the current value is null if (!$this->isNextLineIndented() && !$this->isNextLineUnIndentedCollection()) { // Spec: Keys MUST be unique; first one wins. // But overwriting is allowed when a merge node is used in current block. if ($allowOverwrite || !isset($data[$key])) { if (!$allowOverwrite && \array_key_exists($key, $data)) { trigger_deprecation('symfony/yaml', '7.2', 'Duplicate key "%s" detected on line %d whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated and will throw a ParseException in 8.0.', $key, $this->getRealCurrentLineNb() + 1); } if (null !== $subTag) { $data[$key] = new TaggedValue($subTag, ''); } else { $data[$key] = null; } } else { throw new ParseException(\sprintf('Duplicate key "%s" detected.', $key), $this->getRealCurrentLineNb() + 1, $this->currentLine); } } else { // remember the parsed line number here in case we need it to provide some contexts in error messages below $realCurrentLineNbKey = $this->getRealCurrentLineNb(); $value = $this->parseBlock($this->getRealCurrentLineNb() + 1, $this->getNextEmbedBlock(), $flags); if ('<<' === $key) { $this->refs[$refMatches['ref']] = $value; if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && $value instanceof \stdClass) { $value = (array) $value; } $data += $value; } elseif ($allowOverwrite || !isset($data[$key])) { if (!$allowOverwrite && \array_key_exists($key, $data)) { trigger_deprecation('symfony/yaml', '7.2', 'Duplicate key "%s" detected on line %d whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated and will throw a ParseException in 8.0.', $key, $this->getRealCurrentLineNb() + 1); } // Spec: Keys MUST be unique; first one wins. // But overwriting is allowed when a merge node is used in current block. if (null !== $subTag) { $data[$key] = new TaggedValue($subTag, $value); } else { $data[$key] = $value; } } else { throw new ParseException(\sprintf('Duplicate key "%s" detected.', $key), $realCurrentLineNbKey + 1, $this->currentLine); } } } else { $value = $this->parseValue(rtrim($values['value']), $flags, $context); // Spec: Keys MUST be unique; first one wins. // But overwriting is allowed when a merge node is used in current block. if ($allowOverwrite || !isset($data[$key])) { if (!$allowOverwrite && \array_key_exists($key, $data)) { trigger_deprecation('symfony/yaml', '7.2', 'Duplicate key "%s" detected on line %d whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated and will throw a ParseException in 8.0.', $key, $this->getRealCurrentLineNb() + 1); } $data[$key] = $value; } else { throw new ParseException(\sprintf('Duplicate key "%s" detected.', $key), $this->getRealCurrentLineNb() + 1, $this->currentLine); } } if ($isRef) { $this->refs[$isRef] = $data[$key]; array_pop($this->refsBeingParsed); } } elseif ('"' === $this->currentLine[0] || "'" === $this->currentLine[0]) { if (null !== $context) { throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } try { return Inline::parse($this->lexInlineQuotedString(), $flags, $this->refs); } catch (ParseException $e) { $e->setParsedLine($this->getRealCurrentLineNb() + 1); $e->setSnippet($this->currentLine); throw $e; } } elseif ('{' === $this->currentLine[0]) { if (null !== $context) { throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } try { $parsedMapping = Inline::parse($this->lexInlineMapping(), $flags, $this->refs); while ($this->moveToNextLine()) { if (!$this->isCurrentLineEmpty()) { throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } } return $parsedMapping; } catch (ParseException $e) { $e->setParsedLine($this->getRealCurrentLineNb() + 1); $e->setSnippet($this->currentLine); throw $e; } } elseif ('[' === $this->currentLine[0]) { if (null !== $context) { throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } try { $parsedSequence = Inline::parse($this->lexInlineSequence(), $flags, $this->refs); while ($this->moveToNextLine()) { if (!$this->isCurrentLineEmpty()) { throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } } return $parsedSequence; } catch (ParseException $e) { $e->setParsedLine($this->getRealCurrentLineNb() + 1); $e->setSnippet($this->currentLine); throw $e; } } else { // multiple documents are not supported if ('---' === $this->currentLine) { throw new ParseException('Multiple documents are not supported.', $this->currentLineNb + 1, $this->currentLine, $this->filename); } if (isset($this->currentLine[1]) && '?' === $this->currentLine[0] && ' ' === $this->currentLine[1]) { throw new ParseException('Complex mappings are not supported.', $this->getRealCurrentLineNb() + 1, $this->currentLine); } // 1-liner optionally followed by newline(s) if (\is_string($value) && $this->lines[0] === trim($value)) { try { $value = Inline::parse($this->lines[0], $flags, $this->refs); } catch (ParseException $e) { $e->setParsedLine($this->getRealCurrentLineNb() + 1); $e->setSnippet($this->currentLine); throw $e; } return $value; } // try to parse the value as a multi-line string as a last resort if (0 === $this->currentLineNb) { $previousLineWasNewline = false; $previousLineWasTerminatedWithBackslash = false; $value = ''; foreach ($this->lines as $line) { $trimmedLine = trim($line); if ('#' === ($trimmedLine[0] ?? '')) { continue; } // If the indentation is not consistent at offset 0, it is to be considered as a ParseError if (0 === $this->offset && isset($line[0]) && ' ' === $line[0]) { throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } if (str_contains($line, ': ')) { throw new ParseException('Mapping values are not allowed in multi-line blocks.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } if ('' === $trimmedLine) { $value .= "\n"; } elseif (!$previousLineWasNewline && !$previousLineWasTerminatedWithBackslash) { $value .= ' '; } if ('' !== $trimmedLine && str_ends_with($line, '\\')) { $value .= ltrim(substr($line, 0, -1)); } elseif ('' !== $trimmedLine) { $value .= $trimmedLine; } if ('' === $trimmedLine) { $previousLineWasNewline = true; $previousLineWasTerminatedWithBackslash = false; } elseif (str_ends_with($line, '\\')) { $previousLineWasNewline = false; $previousLineWasTerminatedWithBackslash = true; } else { $previousLineWasNewline = false; $previousLineWasTerminatedWithBackslash = false; } } try { return Inline::parse(trim($value)); } catch (ParseException) { // fall-through to the ParseException thrown below } } throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } } while ($this->moveToNextLine()); if (null !== $tag) { $data = new TaggedValue($tag, $data); } if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && 'mapping' === $context && !\is_object($data)) { $object = new \stdClass(); foreach ($data as $key => $value) { $object->$key = $value; } $data = $object; } return $data ?: null; } private function parseBlock(int $offset, string $yaml, int $flags): mixed { $skippedLineNumbers = $this->skippedLineNumbers; foreach ($this->locallySkippedLineNumbers as $lineNumber) { if ($lineNumber < $offset) { continue; } $skippedLineNumbers[] = $lineNumber; } $parser = new self(); $parser->offset = $offset; $parser->totalNumberOfLines = $this->totalNumberOfLines; $parser->skippedLineNumbers = $skippedLineNumbers; $parser->refs = &$this->refs; $parser->refsBeingParsed = $this->refsBeingParsed; return $parser->doParse($yaml, $flags); } /** * Returns the current line number (takes the offset into account). * * @internal */ public function getRealCurrentLineNb(): int { $realCurrentLineNumber = $this->currentLineNb + $this->offset; foreach ($this->skippedLineNumbers as $skippedLineNumber) { if ($skippedLineNumber > $realCurrentLineNumber) { break; } ++$realCurrentLineNumber; } return $realCurrentLineNumber; } private function getCurrentLineIndentation(): int { if (' ' !== ($this->currentLine[0] ?? '')) { return 0; } return \strlen($this->currentLine) - \strlen(ltrim($this->currentLine, ' ')); } /** * Returns the next embed block of YAML. * * @param int|null $indentation The indent level at which the block is to be read, or null for default * @param bool $inSequence True if the enclosing data structure is a sequence * * @throws ParseException When indentation problem are detected */ private function getNextEmbedBlock(?int $indentation = null, bool $inSequence = false): string { $oldLineIndentation = $this->getCurrentLineIndentation(); if (!$this->moveToNextLine()) { return ''; } if (null === $indentation) { $newIndent = null; $movements = 0; do { $EOF = false; // empty and comment-like lines do not influence the indentation depth if ($this->isCurrentLineEmpty() || $this->isCurrentLineComment()) { $EOF = !$this->moveToNextLine(); if (!$EOF) { ++$movements; } } else { $newIndent = $this->getCurrentLineIndentation(); } } while (!$EOF && null === $newIndent); for ($i = 0; $i < $movements; ++$i) { $this->moveToPreviousLine(); } $unindentedEmbedBlock = $this->isStringUnIndentedCollectionItem(); if (!$this->isCurrentLineEmpty() && 0 === $newIndent && !$unindentedEmbedBlock) { throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } } else { $newIndent = $indentation; } $data = []; if ($this->getCurrentLineIndentation() >= $newIndent) { $data[] = substr($this->currentLine, $newIndent ?? 0); } elseif ($this->isCurrentLineEmpty() || $this->isCurrentLineComment()) { $data[] = $this->currentLine; } else { $this->moveToPreviousLine(); return ''; } if ($inSequence && $oldLineIndentation === $newIndent && isset($data[0][0]) && '-' === $data[0][0]) { // the previous line contained a dash but no item content, this line is a sequence item with the same indentation // and therefore no nested list or mapping $this->moveToPreviousLine(); return ''; } $isItUnindentedCollection = $this->isStringUnIndentedCollectionItem(); $isItComment = $this->isCurrentLineComment(); while ($this->moveToNextLine()) { if ($isItComment && !$isItUnindentedCollection) { $isItUnindentedCollection = $this->isStringUnIndentedCollectionItem(); $isItComment = $this->isCurrentLineComment(); } $indent = $this->getCurrentLineIndentation(); if ($isItUnindentedCollection && !$this->isCurrentLineEmpty() && !$this->isStringUnIndentedCollectionItem() && $newIndent === $indent) { $this->moveToPreviousLine(); break; } if ($this->isCurrentLineBlank()) { $data[] = substr($this->currentLine, $newIndent ?? 0); continue; } if ($indent >= $newIndent) { $data[] = substr($this->currentLine, $newIndent ?? 0); } elseif ($this->isCurrentLineComment()) { $data[] = $this->currentLine; } elseif (0 == $indent) { $this->moveToPreviousLine(); break; } else { throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename); } } return implode("\n", $data); } private function hasMoreLines(): bool { return (\count($this->lines) - 1) > $this->currentLineNb; } /** * Moves the parser to the next line. */ private function moveToNextLine(): bool { if ($this->currentLineNb >= $this->numberOfParsedLines - 1) { return false; } $this->currentLine = $this->lines[++$this->currentLineNb]; return true; } /** * Moves the parser to the previous line. */ private function moveToPreviousLine(): bool { if ($this->currentLineNb < 1) { return false; } $this->currentLine = $this->lines[--$this->currentLineNb]; return true; } /** * Parses a YAML value. * * @param string $value A YAML value * @param int $flags A bit field of Yaml::PARSE_* constants to customize the YAML parser behavior * @param string $context The parser context (either sequence or mapping) * * @throws ParseException When reference does not exist */ private function parseValue(string $value, int $flags, string $context): mixed { if (str_starts_with($value, '*')) { if (false !== $pos = strpos($value, '#')) { $value = substr($value, 1, $pos - 2); } else { $value = substr($value, 1); } if (!\array_key_exists($value, $this->refs)) { if (false !== $pos = array_search($value, $this->refsBeingParsed, true)) { throw new ParseException(\sprintf('Circular reference [%s] detected for reference "%s".', implode(', ', array_merge(\array_slice($this->refsBeingParsed, $pos), [$value])), $value), $this->currentLineNb + 1, $this->currentLine, $this->filename); } throw new ParseException(\sprintf('Reference "%s" does not exist.', $value), $this->currentLineNb + 1, $this->currentLine, $this->filename); } return $this->refs[$value]; } if (\in_array($value[0], ['!', '|', '>'], true) && self::preg_match('/^(?:'.self::TAG_PATTERN.' +)?'.self::BLOCK_SCALAR_HEADER_PATTERN.'$/', $value, $matches)) { $modifiers = $matches['modifiers'] ?? ''; $data = $this->parseBlockScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), abs((int) $modifiers)); if ('' !== $matches['tag'] && '!' !== $matches['tag']) { if ('!!binary' === $matches['tag']) { return Inline::evaluateBinaryScalar($data); } return new TaggedValue(substr($matches['tag'], 1), $data); } return $data; } try { if ('' !== $value && '{' === $value[0]) { $cursor = \strlen(rtrim($this->currentLine)) - \strlen(rtrim($value)); return Inline::parse($this->lexInlineMapping($cursor), $flags, $this->refs); } elseif ('' !== $value && '[' === $value[0]) { $cursor = \strlen(rtrim($this->currentLine)) - \strlen(rtrim($value)); return Inline::parse($this->lexInlineSequence($cursor), $flags, $this->refs); } switch ($value[0] ?? '') { case '"': case "'": $cursor = \strlen(rtrim($this->currentLine)) - \strlen(rtrim($value)); $parsedValue = Inline::parse($this->lexInlineQuotedString($cursor), $flags, $this->refs); if (isset($this->currentLine[$cursor]) && preg_replace('/\s*(#.*)?$/A', '', substr($this->currentLine, $cursor))) { throw new ParseException(\sprintf('Unexpected characters near "%s".', substr($this->currentLine, $cursor))); } return $parsedValue; default: $lines = []; while ($this->moveToNextLine()) { // unquoted strings end before the first unindented line if (0 === $this->getCurrentLineIndentation()) { $this->moveToPreviousLine(); break; } $lines[] = trim($this->currentLine); } for ($i = 0, $linesCount = \count($lines), $previousLineBlank = false; $i < $linesCount; ++$i) { if ('' === $lines[$i]) { $value .= "\n"; $previousLineBlank = true; } elseif ($previousLineBlank) { $value .= $lines[$i]; $previousLineBlank = false; } else { $value .= ' '.$lines[$i]; $previousLineBlank = false; } } Inline::$parsedLineNumber = $this->getRealCurrentLineNb(); $parsedValue = Inline::parse($value, $flags, $this->refs); if ('mapping' === $context && \is_string($parsedValue) && '"' !== $value[0] && "'" !== $value[0] && '[' !== $value[0] && '{' !== $value[0] && '!' !== $value[0] && str_contains($parsedValue, ': ')) { throw new ParseException('A colon cannot be used in an unquoted mapping value.', $this->getRealCurrentLineNb() + 1, $value, $this->filename); } return $parsedValue; } } catch (ParseException $e) { $e->setParsedLine($this->getRealCurrentLineNb() + 1); $e->setSnippet($this->currentLine); throw $e; } } /** * Parses a block scalar. * * @param string $style The style indicator that was used to begin this block scalar (| or >) * @param string $chomping The chomping indicator that was used to begin this block scalar (+ or -) * @param int $indentation The indentation indicator that was used to begin this block scalar */ private function parseBlockScalar(string $style, string $chomping = '', int $indentation = 0): string { $notEOF = $this->moveToNextLine(); if (!$notEOF) { return ''; } $isCurrentLineBlank = $this->isCurrentLineBlank(); $blockLines = []; // leading blank lines are consumed before determining indentation while ($notEOF && $isCurrentLineBlank) { // newline only if not EOF if ($notEOF = $this->moveToNextLine()) { $blockLines[] = ''; $isCurrentLineBlank = $this->isCurrentLineBlank(); } } // determine indentation if not specified if (0 === $indentation) { $currentLineLength = \strlen($this->currentLine); for ($i = 0; $i < $currentLineLength && ' ' === $this->currentLine[$i]; ++$i) { ++$indentation; } } if ($indentation > 0) { $pattern = \sprintf('/^ {%d}(.*)$/', $indentation); while ( $notEOF && ( $isCurrentLineBlank || self::preg_match($pattern, $this->currentLine, $matches) ) ) { if ($isCurrentLineBlank && \strlen($this->currentLine) > $indentation) { $blockLines[] = substr($this->currentLine, $indentation); } elseif ($isCurrentLineBlank) { $blockLines[] = ''; } else { $blockLines[] = $matches[1]; } // newline only if not EOF if ($notEOF = $this->moveToNextLine()) { $isCurrentLineBlank = $this->isCurrentLineBlank(); } } } elseif ($notEOF) { $blockLines[] = ''; } if ($notEOF) { $blockLines[] = ''; $this->moveToPreviousLine(); } elseif (!$this->isCurrentLineLastLineInDocument()) { $blockLines[] = ''; } // folded style if ('>' === $style) { $text = ''; $previousLineIndented = false; $previousLineBlank = false; for ($i = 0, $blockLinesCount = \count($blockLines); $i < $blockLinesCount; ++$i) { if ('' === $blockLines[$i]) { $text .= "\n"; $previousLineIndented = false; $previousLineBlank = true; } elseif (' ' === $blockLines[$i][0]) { $text .= "\n".$blockLines[$i]; $previousLineIndented = true; $previousLineBlank = false; } elseif ($previousLineIndented) { $text .= "\n".$blockLines[$i]; $previousLineIndented = false; $previousLineBlank = false; } elseif ($previousLineBlank || 0 === $i) { $text .= $blockLines[$i]; $previousLineIndented = false; $previousLineBlank = false; } else { $text .= ' '.$blockLines[$i]; $previousLineIndented = false; $previousLineBlank = false; } } } else { $text = implode("\n", $blockLines); } // deal with trailing newlines if ('' === $chomping) { $text = preg_replace('/\n+$/', "\n", $text); } elseif ('-' === $chomping) { $text = preg_replace('/\n+$/', '', $text); } return $text; } /** * Returns true if the next line is indented. */ private function isNextLineIndented(): bool { $currentIndentation = $this->getCurrentLineIndentation(); $movements = 0; do { $EOF = !$this->moveToNextLine(); if (!$EOF) { ++$movements; } } while (!$EOF && ($this->isCurrentLineEmpty() || $this->isCurrentLineComment())); if ($EOF) { for ($i = 0; $i < $movements; ++$i) { $this->moveToPreviousLine(); } return false; } $ret = $this->getCurrentLineIndentation() > $currentIndentation; for ($i = 0; $i < $movements; ++$i) { $this->moveToPreviousLine(); } return $ret; } private function isCurrentLineEmpty(): bool { return $this->isCurrentLineBlank() || $this->isCurrentLineComment(); } private function isCurrentLineBlank(): bool { return '' === $this->currentLine || '' === trim($this->currentLine, ' '); } private function isCurrentLineComment(): bool { // checking explicitly the first char of the trim is faster than loops or strpos $ltrimmedLine = '' !== $this->currentLine && ' ' === $this->currentLine[0] ? ltrim($this->currentLine, ' ') : $this->currentLine; return '' !== $ltrimmedLine && '#' === $ltrimmedLine[0]; } private function isCurrentLineLastLineInDocument(): bool { return ($this->offset + $this->currentLineNb) >= ($this->totalNumberOfLines - 1); } private function cleanup(string $value): string { $value = str_replace(["\r\n", "\r"], "\n", $value); // strip YAML header $count = 0; $value = preg_replace('#^\%YAML[: ][\d\.]+.*\n#u', '', $value, -1, $count); $this->offset += $count; // remove leading comments $trimmedValue = preg_replace('#^(\#.*?\n)+#s', '', $value, -1, $count); if (1 === $count) { // items have been removed, update the offset $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n"); $value = $trimmedValue; } // remove start of the document marker (---) $trimmedValue = preg_replace('#^\-\-\-.*?\n#s', '', $value, -1, $count); if (1 === $count) { // items have been removed, update the offset $this->offset += substr_count($value, "\n") - substr_count($trimmedValue, "\n"); $value = $trimmedValue; // remove end of the document marker (...) $value = preg_replace('#\.\.\.\s*$#', '', $value); } return $value; } private function isNextLineUnIndentedCollection(): bool { $currentIndentation = $this->getCurrentLineIndentation(); $movements = 0; do { $EOF = !$this->moveToNextLine(); if (!$EOF) { ++$movements; } } while (!$EOF && ($this->isCurrentLineEmpty() || $this->isCurrentLineComment())); if ($EOF) { return false; } $ret = $this->getCurrentLineIndentation() === $currentIndentation && $this->isStringUnIndentedCollectionItem(); for ($i = 0; $i < $movements; ++$i) { $this->moveToPreviousLine(); } return $ret; } private function isStringUnIndentedCollectionItem(): bool { return '-' === rtrim($this->currentLine) || str_starts_with($this->currentLine, '- '); } /** * A local wrapper for "preg_match" which will throw a ParseException if there * is an internal error in the PCRE engine. * * This avoids us needing to check for "false" every time PCRE is used * in the YAML engine * * @throws ParseException on a PCRE internal error * * @internal */ public static function preg_match(string $pattern, string $subject, ?array &$matches = null, int $flags = 0, int $offset = 0): int { if (false === $ret = preg_match($pattern, $subject, $matches, $flags, $offset)) { throw new ParseException(preg_last_error_msg()); } return $ret; } /** * Trim the tag on top of the value. * * Prevent values such as "!foo {quz: bar}" to be considered as * a mapping block. */ private function trimTag(string $value): string { if ('!' === $value[0]) { return ltrim(substr($value, 1, strcspn($value, " \r\n", 1)), ' '); } return $value; } private function getLineTag(string $value, int $flags, bool $nextLineCheck = true): ?string { if ('' === $value || '!' !== $value[0] || 1 !== self::preg_match('/^'.self::TAG_PATTERN.' *( +#.*)?$/', $value, $matches)) { return null; } if ($nextLineCheck && !$this->isNextLineIndented()) { return null; } $tag = substr($matches['tag'], 1); // Built-in tags if ($tag && '!' === $tag[0]) { throw new ParseException(\sprintf('The built-in tag "!%s" is not implemented.', $tag), $this->getRealCurrentLineNb() + 1, $value, $this->filename); } if (Yaml::PARSE_CUSTOM_TAGS & $flags) { return $tag; } throw new ParseException(\sprintf('Tags support is not enabled. You must use the flag "Yaml::PARSE_CUSTOM_TAGS" to use "%s".', $matches['tag']), $this->getRealCurrentLineNb() + 1, $value, $this->filename); } private function lexInlineQuotedString(int &$cursor = 0): string { $quotation = $this->currentLine[$cursor]; $value = $quotation; ++$cursor; $previousLineWasNewline = true; $previousLineWasTerminatedWithBackslash = false; $lineNumber = 0; do { if (++$lineNumber > 1) { $cursor += strspn($this->currentLine, ' ', $cursor); } if ($this->isCurrentLineBlank()) { $value .= "\n"; } elseif (!$previousLineWasNewline && !$previousLineWasTerminatedWithBackslash) { $value .= ' '; } for (; \strlen($this->currentLine) > $cursor; ++$cursor) { switch ($this->currentLine[$cursor]) { case '\\': if ("'" === $quotation) { $value .= '\\'; } elseif (isset($this->currentLine[++$cursor])) { $value .= '\\'.$this->currentLine[$cursor]; } break; case $quotation: ++$cursor; if ("'" === $quotation && isset($this->currentLine[$cursor]) && "'" === $this->currentLine[$cursor]) { $value .= "''"; break; } return $value.$quotation; default: $value .= $this->currentLine[$cursor]; } } if ($this->isCurrentLineBlank()) { $previousLineWasNewline = true; $previousLineWasTerminatedWithBackslash = false; } elseif ('\\' === $this->currentLine[-1]) { $previousLineWasNewline = false; $previousLineWasTerminatedWithBackslash = true; } else { $previousLineWasNewline = false; $previousLineWasTerminatedWithBackslash = false; } if ($this->hasMoreLines()) { $cursor = 0; } } while ($this->moveToNextLine()); throw new ParseException('Malformed inline YAML string.'); } private function lexUnquotedString(int &$cursor): string { $offset = $cursor; while ($cursor < \strlen($this->currentLine)) { if (\in_array($this->currentLine[$cursor], ['[', ']', '{', '}', ',', ':'], true)) { break; } if (\in_array($this->currentLine[$cursor], [' ', "\t"], true) && '#' === ($this->currentLine[$cursor + 1] ?? '')) { break; } ++$cursor; } if ($cursor === $offset) { throw new ParseException('Malformed unquoted YAML string.'); } return substr($this->currentLine, $offset, $cursor - $offset); } private function lexInlineMapping(int &$cursor = 0, bool $consumeUntilEol = true): string { return $this->lexInlineStructure($cursor, '}', $consumeUntilEol); } private function lexInlineSequence(int &$cursor = 0, bool $consumeUntilEol = true): string { return $this->lexInlineStructure($cursor, ']', $consumeUntilEol); } private function lexInlineStructure(int &$cursor, string $closingTag, bool $consumeUntilEol = true): string { $value = $this->currentLine[$cursor]; ++$cursor; do { $this->consumeWhitespaces($cursor); while (isset($this->currentLine[$cursor])) { switch ($this->currentLine[$cursor]) { case '"': case "'": $value .= $this->lexInlineQuotedString($cursor); break; case ':': case ',': $value .= $this->currentLine[$cursor]; ++$cursor; break; case '{': $value .= $this->lexInlineMapping($cursor, false); break; case '[': $value .= $this->lexInlineSequence($cursor, false); break; case $closingTag: $value .= $this->currentLine[$cursor]; ++$cursor; if ($consumeUntilEol && isset($this->currentLine[$cursor]) && ($whitespaces = strspn($this->currentLine, ' ', $cursor) + $cursor) < \strlen($this->currentLine) && '#' !== $this->currentLine[$whitespaces]) { throw new ParseException(\sprintf('Unexpected token "%s".', trim(substr($this->currentLine, $cursor)))); } return $value; case '#': break 2; default: $value .= $this->lexUnquotedString($cursor); } if ($this->consumeWhitespaces($cursor)) { $value .= ' '; } } if ($this->hasMoreLines()) { $cursor = 0; } } while ($this->moveToNextLine()); throw new ParseException('Malformed inline YAML string.'); } private function consumeWhitespaces(int &$cursor): bool { $whitespacesConsumed = 0; do { $whitespaceOnlyTokenLength = strspn($this->currentLine, " \t", $cursor); $whitespacesConsumed += $whitespaceOnlyTokenLength; $cursor += $whitespaceOnlyTokenLength; if (isset($this->currentLine[$cursor])) { return 0 < $whitespacesConsumed; } if ($this->hasMoreLines()) { $cursor = 0; } } while ($this->moveToNextLine()); return 0 < $whitespacesConsumed; } }
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