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Parser.php
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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 $filename;
private $offset = 0;
private $numberOfParsedLines = 0;
private $totalNumberOfLines;
private $lines = [];
private $currentLineNb = -1;
private $currentLine = '';
private $refs = [];
private $skippedLineNumbers = [];
private $locallySkippedLineNumbers = [];
private $refsBeingParsed = [];
/**
* Parses a YAML file into a PHP value.
*
* @param string $filename The path to the YAML file to be parsed
* @param int $flags A bit field of Yaml::PARSE_* constants to customize the YAML parser behavior
*
* @return mixed
*
* @throws ParseException If the file could not be read or the YAML is not valid
*/
public function parseFile(string $filename, int $flags = 0)
{
if (!is_file($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 $flags A bit field of Yaml::PARSE_* constants to customize the YAML parser behavior
*
* @return mixed
*
* @throws ParseException If the YAML is not valid
*/
public function parse(string $value, int $flags = 0)
{
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 = [];
$mbEncoding = null;
if (2 /* MB_OVERLOAD_STRING */ & (int) \ini_get('mbstring.func_overload')) {
$mbEncoding = mb_internal_encoding();
mb_internal_encoding('UTF-8');
}
try {
$data = $this->doParse($value, $flags);
} finally {
if (null !== $mbEncoding) {
mb_internal_encoding($mbEncoding);
}
$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)
{
$this->currentLineNb = -1;
$this->currentLine = '';
$value = $this->cleanup($value);
$this->lines = explode("\n", $value);
$this->numberOfParsedLines = \count($this->lines);
$this->locallySkippedLineNumbers = [];
if (null === $this->totalNumberOfLines) {
$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']) && 0 === strpos(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($values['value'], ' ') || 0 === strpos(ltrim($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.'|(?:!?!php/const:)?[^ \'"\[\{!].*?)) *\:(( |\t)++(?P<value>.+))?$#u', rtrim($this->currentLine), $values)
&& (false === strpos($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']) || '' === $values['value'] || 0 === strpos($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 (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])) {
// 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])) {
$data[$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, $this->filename);
}
if ($deprecatedUsage = (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 === $this->offset && !$deprecatedUsage && isset($line[0]) && ' ' === $line[0]) {
throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine, $this->filename);
}
if (false !== strpos($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 ('' !== $trimmedLine && '\\' === substr($line, -1)) {
$value .= ltrim(substr($line, 0, -1));
} elseif ('' !== $trimmedLine) {
$value .= $trimmedLine;
}
if ('' === $trimmedLine) {
$previousLineWasNewline = true;
$previousLineWasTerminatedWithBackslash = false;
} elseif ('\\' === substr($line, -1)) {
$previousLineWasNewline = false;
$previousLineWasTerminatedWithBackslash = true;
} else {
$previousLineWasNewline = false;
$previousLineWasTerminatedWithBackslash = false;
}
}
try {
return Inline::parse(trim($value));
} catch (ParseException $e) {
// 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 = $object;
}
return empty($data) ? null : $data;
}
private function parseBlock(int $offset, string $yaml, int $flags)
{
$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 $realCurrentLineNumber;
}
/**
* Returns the current line indentation.
*/
private function getCurrentLineIndentation(): int
{
if (' ' !== ($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)
*
* @return mixed
*
* @throws ParseException When reference does not exist
*/
private function parseValue(string $value, int $flags, string $context)
{
if (0 === strpos($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] && '!' !== $value[0] && false !== strpos($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[] = '';
$this->moveToPreviousLine();
} elseif (!$notEOF && !$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;
}
/**
* Returns true if the current line is blank or if it is a comment line.
*/
private function isCurrentLineEmpty(): bool
{
return $this->isCurrentLineBlank() || $this->isCurrentLineComment();
}
/**
* Returns true if the current line is blank.
*/
private function isCurrentLineBlank(): bool
{
return '' === $this->currentLine || '' === trim($this->currentLine, ' ');
}
/**
* Returns true if the current line is a comment line.
*/
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);
}
/**
* Cleanups a YAML string to be parsed.
*
* @param string $value The input YAML string
*/
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;
}
/**
* Returns true if the next line starts unindented collection.
*/
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 $ret;
}
/**
* Returns true if the string is un-indented collection item.
*/
private function isStringUnIndentedCollectionItem(): bool
{
return '-' === rtrim($this->currentLine) || 0 === strpos($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
*
* @see preg_last_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)) {
switch (preg_last_error()) {
case \PREG_INTERNAL_ERROR:
$error = 'Internal PCRE error.';
break;
case \PREG_BACKTRACK_LIMIT_ERROR:
$error = 'pcre.backtrack_limit reached.';
break;
case \PREG_RECURSION_LIMIT_ERROR:
$error = 'pcre.recursion_limit reached.';
break;
case \PREG_BAD_UTF8_ERROR:
$error = 'Malformed UTF-8 data.';
break;
case \PREG_BAD_UTF8_OFFSET_ERROR:
$error = 'Offset doesn\'t correspond to the begin of a valid UTF-8 code point.';
break;
default:
$error = 'Error.';
}
throw new ParseException($error);
}
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;
$cursor += strcspn($this->currentLine, '[]{},: ', $cursor);
if ($cursor === $offset) {
throw new ParseException('Malformed unquoted YAML string.');
}
return substr($this->currentLine, $offset, $cursor - $offset);
}
private function lexInlineMapping(int &$cursor = 0): string
{
return $this->lexInlineStructure($cursor, '}');
}
private function lexInlineSequence(int &$cursor = 0): string
{
return $this->lexInlineStructure($cursor, ']');
}
private function lexInlineStructure(int &$cursor, string $closingTag): 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);
break;
case '[':
$value .= $this->lexInlineSequence($cursor);
break;
case $closingTag:
$value .= $this->currentLine[$cursor];
++$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, ' ', $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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