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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>
*/
class Parser
{
const TAG_PATTERN = '(?P<tag>![\w!.\/:-]+)';
const BLOCK_SCALAR_HEADER_PATTERN = '(?P<separator>\||>)(?P<modifiers>\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P<comments> +#.*)?';
private $offset = 0;
private $totalNumberOfLines;
private $lines = array();
private $currentLineNb = -1;
private $currentLine = '';
private $refs = array();
private $skippedLineNumbers = array();
private $locallySkippedLineNumbers = array();
public function __construct()
{
if (func_num_args() > 0) {
@trigger_error(sprintf('The constructor arguments $offset, $totalNumberOfLines, $skippedLineNumbers of %s are deprecated and will be removed in 4.0', self::class), E_USER_DEPRECATED);
$this->offset = func_get_arg(0);
if (func_num_args() > 1) {
$this->totalNumberOfLines = func_get_arg(1);
}
if (func_num_args() > 2) {
$this->skippedLineNumbers = func_get_arg(2);
}
}
}
/**
* Parses a YAML string to a PHP value.
*
* @param string $value A YAML string
* @param int $flags A bit field of PARSE_* constants to customize the YAML parser behavior
*
* @return mixed A PHP value
*
* @throws ParseException If the YAML is not valid
*/
public function parse($value, $flags = 0)
{
if (is_bool($flags)) {
@trigger_error('Passing a boolean flag to toggle exception handling is deprecated since version 3.1 and will be removed in 4.0. Use the Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE flag instead.', E_USER_DEPRECATED);
if ($flags) {
$flags = Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE;
} else {
$flags = 0;
}
}
if (func_num_args() >= 3) {
@trigger_error('Passing a boolean flag to toggle object support is deprecated since version 3.1 and will be removed in 4.0. Use the Yaml::PARSE_OBJECT flag instead.', E_USER_DEPRECATED);
if (func_get_arg(2)) {
$flags |= Yaml::PARSE_OBJECT;
}
}
if (func_num_args() >= 4) {
@trigger_error('Passing a boolean flag to toggle object for map support is deprecated since version 3.1 and will be removed in 4.0. Use the Yaml::PARSE_OBJECT_FOR_MAP flag instead.', E_USER_DEPRECATED);
if (func_get_arg(3)) {
$flags |= Yaml::PARSE_OBJECT_FOR_MAP;
}
}
if (false === preg_match('//u', $value)) {
throw new ParseException('The YAML value does not appear to be valid UTF-8.');
}
$this->refs = array();
$mbEncoding = null;
$e = null;
$data = 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);
} catch (\Exception $e) {
} catch (\Throwable $e) {
}
if (null !== $mbEncoding) {
mb_internal_encoding($mbEncoding);
}
$this->lines = array();
$this->currentLine = '';
$this->refs = array();
$this->skippedLineNumbers = array();
$this->locallySkippedLineNumbers = array();
if (null !== $e) {
throw $e;
}
return $data;
}
private function doParse($value, $flags)
{
$this->currentLineNb = -1;
$this->currentLine = '';
$value = $this->cleanup($value);
$this->lines = explode("\n", $value);
$this->locallySkippedLineNumbers = array();
if (null === $this->totalNumberOfLines) {
$this->totalNumberOfLines = count($this->lines);
}
if (!$this->moveToNextLine()) {
return null;
}
$data = array();
$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);
}
$isRef = $mergeNode = false;
if (self::preg_match('#^\-((?P<leadspaces>\s+)(?P<value>.+))?$#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);
}
$context = 'sequence';
if (isset($values['value']) && self::preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#u', $values['value'], $matches)) {
$isRef = $matches['ref'];
$values['value'] = $matches['value'];
}
if (isset($values['value'][1]) && '?' === $values['value'][0] && ' ' === $values['value'][1]) {
@trigger_error('Starting an unquoted string with a question mark followed by a space is deprecated since version 3.3 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', E_USER_DEPRECATED);
}
// array
if (!isset($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'])
&& self::preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\{\[].*?) *\:(\s+(?P<value>.+?))?\s*$#u', $this->trimTag($values['value']), $matches)
) {
// this is a compact notation element, add to next block and parse
$block = $values['value'];
if ($this->isNextLineIndented()) {
$block .= "\n".$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);
}
} elseif (
self::preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|(?:![^\s]++\s++)?[^ \'"\[\{!].*?) *\:(\s++(?P<value>.+))?$#u', rtrim($this->currentLine), $values)
&& (false === strpos($values['key'], ' #') || in_array($values['key'][0], array('"', "'")))
) {
if ($context && 'sequence' == $context) {
throw new ParseException('You cannot define a mapping item when in a sequence', $this->currentLineNb + 1, $this->currentLine);
}
$context = 'mapping';
// force correct settings
Inline::parse(null, $flags, $this->refs);
try {
Inline::$parsedLineNumber = $this->getRealCurrentLineNb();
$i = 0;
$key = Inline::parseScalar($values['key'], 0, null, $i, !(Yaml::PARSE_KEYS_AS_STRINGS & $flags));
} catch (ParseException $e) {
$e->setParsedLine($this->getRealCurrentLineNb() + 1);
$e->setSnippet($this->currentLine);
throw $e;
}
if (!(Yaml::PARSE_KEYS_AS_STRINGS & $flags) && !is_string($key)) {
@trigger_error('Implicit casting of incompatible mapping keys to strings is deprecated since version 3.3 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0. Pass the PARSE_KEYS_AS_STRING flag to explicitly enable the type casts.', E_USER_DEPRECATED);
}
// Convert float keys to strings, to avoid being converted to integers by PHP
if (is_float($key)) {
$key = (string) $key;
}
if ('<<' === $key) {
$mergeNode = true;
$allowOverwrite = true;
if (isset($values['value']) && 0 === strpos($values['value'], '*')) {
$refName = substr(rtrim($values['value']), 1);
if (!array_key_exists($refName, $this->refs)) {
throw new ParseException(sprintf('Reference "%s" does not exist.', $refName), $this->getRealCurrentLineNb() + 1, $this->currentLine);
}
$refValue = $this->refs[$refName];
if (!is_array($refValue)) {
throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
}
$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, $flags);
if (!is_array($parsed)) {
throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
}
if (isset($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 $parsedItem) {
if (!is_array($parsedItem)) {
throw new ParseException('Merge items must be arrays.', $this->getRealCurrentLineNb() + 1, $parsedItem);
}
$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 += $parsed; // array union
}
}
} elseif (isset($values['value']) && self::preg_match('#^&(?P<ref>[^ ]++) *+(?P<value>.*)#u', $values['value'], $matches)) {
$isRef = $matches['ref'];
$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'], $flags))) {
// hash
// if next line is less indented or equal, then it means that the current value is null
if (!$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 {
@trigger_error(sprintf('Duplicate key "%s" detected on line %d whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated since version 3.2 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', $key, $this->getRealCurrentLineNb() + 1), E_USER_DEPRECATED);
}
} 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(), $flags);
// Spec: Keys MUST be unique; first one wins.
// But overwriting is allowed when a merge node is used in current block.
if ($allowOverwrite || !isset($data[$key])) {
if (null !== $subTag) {
$data[$key] = new TaggedValue($subTag, $value);
} else {
$data[$key] = $value;
}
} else {
@trigger_error(sprintf('Duplicate key "%s" detected on line %d whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated since version 3.2 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', $key, $realCurrentLineNbKey + 1), E_USER_DEPRECATED);
}
}
} 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 {
@trigger_error(sprintf('Duplicate key "%s" detected on line %d whilst parsing YAML. Silent handling of duplicate mapping keys in YAML is deprecated since version 3.2 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', $key, $this->getRealCurrentLineNb() + 1), E_USER_DEPRECATED);
}
}
if ($isRef) {
$this->refs[$isRef] = $data[$key];
}
} else {
// multiple documents are not supported
if ('---' === $this->currentLine) {
throw new ParseException('Multiple documents are not supported.', $this->currentLineNb + 1, $this->currentLine);
}
if (isset($this->currentLine[1]) && '?' === $this->currentLine[0] && ' ' === $this->currentLine[1]) {
@trigger_error('Starting an unquoted string with a question mark followed by a space is deprecated since version 3.3 and will throw \Symfony\Component\Yaml\Exception\ParseException in 4.0.', E_USER_DEPRECATED);
}
// 1-liner optionally followed by newline(s)
if (is_string($value) && $this->lines[0] === trim($value)) {
try {
Inline::$parsedLineNumber = $this->getRealCurrentLineNb();
$value = Inline::parse($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) {
$parseError = false;
$previousLineWasNewline = false;
$value = '';
foreach ($this->lines as $line) {
try {
$parsedLine = Inline::parse($line, $flags, $this->refs);
if (!is_string($parsedLine)) {
$parseError = true;
break;
}
if ('' === trim($parsedLine)) {
$value .= "\n";
$previousLineWasNewline = true;
} elseif ($previousLineWasNewline) {
$value .= trim($parsedLine);
$previousLineWasNewline = false;
} else {
$value .= ' '.trim($parsedLine);
$previousLineWasNewline = false;
}
} catch (ParseException $e) {
$parseError = true;
break;
}
}
if (!$parseError) {
return trim($value);
}
}
throw new ParseException('Unable to parse.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
}
} while ($this->moveToNextLine());
if (null !== $tag) {
$data = new TaggedValue($tag, $data);
}
if (Yaml::PARSE_OBJECT_FOR_MAP & $flags && !is_object($data) && 'mapping' === $context) {
$object = new \stdClass();
foreach ($data as $key => $value) {
$object->$key = $value;
}
$data = $object;
}
return empty($data) ? null : $data;
}
private function parseBlock($offset, $yaml, $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;
return $parser->doParse($yaml, $flags);
}
/**
* Returns the current line number (takes the offset into account).
*
* @return int The current line number
*/
private function getRealCurrentLineNb()
{
$realCurrentLineNumber = $this->currentLineNb + $this->offset;
foreach ($this->skippedLineNumbers as $skippedLineNumber) {
if ($skippedLineNumber > $realCurrentLineNumber) {
break;
}
++$realCurrentLineNumber;
}
return $realCurrentLineNumber;
}
/**
* Returns the current line indentation.
*
* @return int The current line indentation
*/
private function getCurrentLineIndentation()
{
return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' '));
}
/**
* Returns the next embed block of YAML.
*
* @param int $indentation The indent level at which the block is to be read, or null for default
* @param bool $inSequence True if the enclosing data structure is a sequence
*
* @return string A YAML string
*
* @throws ParseException When indentation problem are detected
*/
private function getNextEmbedBlock($indentation = null, $inSequence = false)
{
$oldLineIndentation = $this->getCurrentLineIndentation();
$blockScalarIndentations = array();
if ($this->isBlockScalarHeader()) {
$blockScalarIndentations[] = $oldLineIndentation;
}
if (!$this->moveToNextLine()) {
return;
}
if (null === $indentation) {
$newIndent = $this->getCurrentLineIndentation();
$unindentedEmbedBlock = $this->isStringUnIndentedCollectionItem();
if (!$this->isCurrentLineEmpty() && 0 === $newIndent && !$unindentedEmbedBlock) {
throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
}
} else {
$newIndent = $indentation;
}
$data = array();
if ($this->getCurrentLineIndentation() >= $newIndent) {
$data[] = substr($this->currentLine, $newIndent);
} 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 = $this->isStringUnIndentedCollectionItem();
if (empty($blockScalarIndentations) && $this->isBlockScalarHeader()) {
$blockScalarIndentations[] = $this->getCurrentLineIndentation();
}
$previousLineIndentation = $this->getCurrentLineIndentation();
while ($this->moveToNextLine()) {
$indent = $this->getCurrentLineIndentation();
// terminate all block scalars that are more indented than the current line
if (!empty($blockScalarIndentations) && $indent < $previousLineIndentation && trim($this->currentLine) !== '') {
foreach ($blockScalarIndentations as $key => $blockScalarIndentation) {
if ($blockScalarIndentation >= $indent) {
unset($blockScalarIndentations[$key]);
}
}
}
if (empty($blockScalarIndentations) && !$this->isCurrentLineComment() && $this->isBlockScalarHeader()) {
$blockScalarIndentations[] = $indent;
}
$previousLineIndentation = $indent;
if ($isItUnindentedCollection && !$this->isCurrentLineEmpty() && !$this->isStringUnIndentedCollectionItem() && $newIndent === $indent) {
$this->moveToPreviousLine();
break;
}
if ($this->isCurrentLineBlank()) {
$data[] = substr($this->currentLine, $newIndent);
continue;
}
// we ignore "comment" lines only when we are not inside a scalar block
if (empty($blockScalarIndentations) && $this->isCurrentLineComment()) {
// remember ignored comment lines (they are used later in nested
// parser calls to determine real line numbers)
//
// CAUTION: beware to not populate the global property here as it
// will otherwise influence the getRealCurrentLineNb() call here
// for consecutive comment lines and subsequent embedded blocks
$this->locallySkippedLineNumbers[] = $this->getRealCurrentLineNb();
continue;
}
if ($indent >= $newIndent) {
$data[] = substr($this->currentLine, $newIndent);
} elseif (0 == $indent) {
$this->moveToPreviousLine();
break;
} else {
throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine);
}
}
return implode("\n", $data);
}
/**
* Moves the parser to the next line.
*
* @return bool
*/
private function moveToNextLine()
{
if ($this->currentLineNb >= count($this->lines) - 1) {
return false;
}
$this->currentLine = $this->lines[++$this->currentLineNb];
return true;
}
/**
* Moves the parser to the previous line.
*
* @return bool
*/
private function moveToPreviousLine()
{
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 PARSE_* constants to customize the YAML parser behavior
* @param string $context The parser context (either sequence or mapping)
*
* @return mixed A PHP value
*
* @throws ParseException When reference does not exist
*/
private function parseValue($value, $flags, $context)
{
if (0 === strpos($value, '*')) {
if (false !== $pos = strpos($value, '#')) {
$value = substr($value, 1, $pos - 2);
} else {
$value = substr($value, 1);
}
if (!array_key_exists($value, $this->refs)) {
throw new ParseException(sprintf('Reference "%s" does not exist.', $value), $this->currentLineNb + 1, $this->currentLine);
}
return $this->refs[$value];
}
if (self::preg_match('/^(?:'.self::TAG_PATTERN.' +)?'.self::BLOCK_SCALAR_HEADER_PATTERN.'$/', $value, $matches)) {
$modifiers = isset($matches['modifiers']) ? $matches['modifiers'] : '';
$data = $this->parseBlockScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), (int) abs($modifiers));
if ('' !== $matches['tag']) {
if ('!!binary' === $matches['tag']) {
return Inline::evaluateBinaryScalar($data);
} elseif ('!' !== $matches['tag']) {
@trigger_error(sprintf('Using the custom tag "%s" for the value "%s" is deprecated since version 3.3. It will be replaced by an instance of %s in 4.0.', $matches['tag'], $data, TaggedValue::class), E_USER_DEPRECATED);
}
}
return $data;
}
try {
$quotation = '' !== $value && ('"' === $value[0] || "'" === $value[0]) ? $value[0] : null;
// do not take following lines into account when the current line is a quoted single line value
if (null !== $quotation && self::preg_match('/^'.$quotation.'.*'.$quotation.'(\s*#.*)?$/', $value)) {
return Inline::parse($value, $flags, $this->refs);
}
while ($this->moveToNextLine()) {
// unquoted strings end before the first unindented line
if (null === $quotation && $this->getCurrentLineIndentation() === 0) {
$this->moveToPreviousLine();
break;
}
$value .= ' '.trim($this->currentLine);
// quoted string values end with a line that is terminated with the quotation character
if ('' !== $this->currentLine && substr($this->currentLine, -1) === $quotation) {
break;
}
}
Inline::$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.');
}
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 $indentation The indentation indicator that was used to begin this block scalar
*
* @return string The text value
*/
private function parseBlockScalar($style, $chomping = '', $indentation = 0)
{
$notEOF = $this->moveToNextLine();
if (!$notEOF) {
return '';
}
$isCurrentLineBlank = $this->isCurrentLineBlank();
$blockLines = array();
// leading blank lines are consumed before determining indentation
while ($notEOF && $isCurrentLineBlank) {
// newline only if not EOF
if ($notEOF = $this->moveToNextLine()) {
$blockLines[] = '';
$isCurrentLineBlank = $this->isCurrentLineBlank();
}
}
// determine indentation if not specified
if (0 === $indentation) {
if (self::preg_match('/^ +/', $this->currentLine, $matches)) {
$indentation = strlen($matches[0]);
}
}
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.
*
* @return bool Returns true if the next line is indented, false otherwise
*/
private function isNextLineIndented()
{
$currentIndentation = $this->getCurrentLineIndentation();
$EOF = !$this->moveToNextLine();
while (!$EOF && $this->isCurrentLineEmpty()) {
$EOF = !$this->moveToNextLine();
}
if ($EOF) {
return false;
}
$ret = $this->getCurrentLineIndentation() > $currentIndentation;
$this->moveToPreviousLine();
return $ret;
}
/**
* Returns true if the current line is blank or if it is a comment line.
*
* @return bool Returns true if the current line is empty or if it is a comment line, false otherwise
*/
private function isCurrentLineEmpty()
{
return $this->isCurrentLineBlank() || $this->isCurrentLineComment();
}
/**
* Returns true if the current line is blank.
*
* @return bool Returns true if the current line is blank, false otherwise
*/
private function isCurrentLineBlank()
{
return '' == trim($this->currentLine, ' ');
}
/**
* Returns true if the current line is a comment line.
*
* @return bool Returns true if the current line is a comment line, false otherwise
*/
private function isCurrentLineComment()
{
//checking explicitly the first char of the trim is faster than loops or strpos
$ltrimmedLine = ltrim($this->currentLine, ' ');
return '' !== $ltrimmedLine && $ltrimmedLine[0] === '#';
}
private function isCurrentLineLastLineInDocument()
{
return ($this->offset + $this->currentLineNb) >= ($this->totalNumberOfLines - 1);
}
/**
* Cleanups a YAML string to be parsed.
*
* @param string $value The input YAML string
*
* @return string A cleaned up YAML string
*/
private function cleanup($value)
{
$value = str_replace(array("\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, $count);
if ($count == 1) {
// 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, $count);
if ($count == 1) {
// 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.
*
* @return bool Returns true if the next line starts unindented collection, false otherwise
*/
private function isNextLineUnIndentedCollection()
{
$currentIndentation = $this->getCurrentLineIndentation();
$notEOF = $this->moveToNextLine();
while ($notEOF && $this->isCurrentLineEmpty()) {
$notEOF = $this->moveToNextLine();
}
if (false === $notEOF) {
return false;
}
$ret = $this->getCurrentLineIndentation() === $currentIndentation && $this->isStringUnIndentedCollectionItem();
$this->moveToPreviousLine();
return $ret;
}
/**
* Returns true if the string is un-indented collection item.
*
* @return bool Returns true if the string is un-indented collection item, false otherwise
*/
private function isStringUnIndentedCollectionItem()
{
return '-' === rtrim($this->currentLine) || 0 === strpos($this->currentLine, '- ');
}
/**
* Tests whether or not the current line is the header of a block scalar.
*
* @return bool
*/
private function isBlockScalarHeader()
{
return (bool) self::preg_match('~'.self::BLOCK_SCALAR_HEADER_PATTERN.'$~', $this->currentLine);
}
/**
* A local wrapper for `preg_match` which will throw a ParseException if there
* is an internal error in the PCRE engine.
*
* This avoids us needing to check for "false" every time PCRE is used
* in the YAML engine
*
* @throws ParseException on a PCRE internal error
*
* @see preg_last_error()
*
* @internal
*/
public static function preg_match($pattern, $subject, &$matches = null, $flags = 0, $offset = 0)
{
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 $ret;
}
/**
* Trim the tag on top of the value.
*
* Prevent values such as `!foo {quz: bar}` to be considered as
* a mapping block.
*/
private function trimTag($value)
{
if ('!' === $value[0]) {
return ltrim(substr($value, 1, strcspn($value, " \r\n", 1)), ' ');
}
return $value;
}
private function getLineTag($value, $flags, $nextLineCheck = true)
{
if ('' === $value || '!' !== $value[0] || 1 !== self::preg_match('/^'.self::TAG_PATTERN.' *( +#.*)?$/', $value, $matches)) {
return;
}
if ($nextLineCheck && !$this->isNextLineIndented()) {
return;
}
$tag = substr($matches['tag'], 1);
// Built-in tags
if ($tag && '!' === $tag[0]) {
throw new ParseException(sprintf('The built-in tag "!%s" is not implemented.', $tag));
}
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']));
}
}