diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Yaml/Parser.php --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/vendor/symfony/src/Symfony/Component/Yaml/Parser.php Sat Sep 24 15:40:41 2011 +0200 @@ -0,0 +1,556 @@ + + * + * 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; + +/** + * Parser parses YAML strings to convert them to PHP arrays. + * + * @author Fabien Potencier + */ +class Parser +{ + private $offset = 0; + private $lines = array(); + private $currentLineNb = -1; + private $currentLine = ''; + private $refs = array(); + + /** + * Constructor + * + * @param integer $offset The offset of YAML document (used for line numbers in error messages) + */ + public function __construct($offset = 0) + { + $this->offset = $offset; + } + + /** + * Parses a YAML string to a PHP value. + * + * @param string $value A YAML string + * + * @return mixed A PHP value + * + * @throws ParseException If the YAML is not valid + */ + public function parse($value) + { + $this->currentLineNb = -1; + $this->currentLine = ''; + $this->lines = explode("\n", $this->cleanup($value)); + + if (function_exists('mb_detect_encoding') && false === mb_detect_encoding($value, 'UTF-8', true)) { + throw new ParseException('The YAML value does not appear to be valid UTF-8.'); + } + + if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) { + $mbEncoding = mb_internal_encoding(); + mb_internal_encoding('UTF-8'); + } + + $data = array(); + while ($this->moveToNextLine()) { + 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 = $isInPlace = $isProcessed = false; + if (preg_match('#^\-((?P\s+)(?P.+?))?\s*$#u', $this->currentLine, $values)) { + if (isset($values['value']) && preg_match('#^&(?P[^ ]+) *(?P.*)#u', $values['value'], $matches)) { + $isRef = $matches['ref']; + $values['value'] = $matches['value']; + } + + // array + if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#')) { + $c = $this->getRealCurrentLineNb() + 1; + $parser = new Parser($c); + $parser->refs =& $this->refs; + $data[] = $parser->parse($this->getNextEmbedBlock()); + } else { + if (isset($values['leadspaces']) + && ' ' == $values['leadspaces'] + && preg_match('#^(?P'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\{\[].*?) *\:(\s+(?P.+?))?\s*$#u', $values['value'], $matches) + ) { + // this is a compact notation element, add to next block and parse + $c = $this->getRealCurrentLineNb(); + $parser = new Parser($c); + $parser->refs =& $this->refs; + + $block = $values['value']; + if (!$this->isNextLineIndented()) { + $block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + 2); + } + + $data[] = $parser->parse($block); + } else { + $data[] = $this->parseValue($values['value']); + } + } + } else if (preg_match('#^(?P'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\[\{].*?) *\:(\s+(?P.+?))?\s*$#u', $this->currentLine, $values)) { + try { + $key = Inline::parseScalar($values['key']); + } catch (ParseException $e) { + $e->setParsedLine($this->getRealCurrentLineNb() + 1); + $e->setSnippet($this->currentLine); + + throw $e; + } + + if ('<<' === $key) { + if (isset($values['value']) && '*' === substr($values['value'], 0, 1)) { + $isInPlace = substr($values['value'], 1); + if (!array_key_exists($isInPlace, $this->refs)) { + throw new ParseException(sprintf('Reference "%s" does not exist.', $isInPlace), $this->getRealCurrentLineNb() + 1, $this->currentLine); + } + } else { + if (isset($values['value']) && $values['value'] !== '') { + $value = $values['value']; + } else { + $value = $this->getNextEmbedBlock(); + } + $c = $this->getRealCurrentLineNb() + 1; + $parser = new Parser($c); + $parser->refs =& $this->refs; + $parsed = $parser->parse($value); + + $merged = array(); + if (!is_array($parsed)) { + throw new ParseException('YAML merge keys used with a scalar value instead of an array.', $this->getRealCurrentLineNb() + 1, $this->currentLine); + } else if (isset($parsed[0])) { + // Numeric array, merge individual elements + foreach (array_reverse($parsed) as $parsedItem) { + if (!is_array($parsedItem)) { + throw new ParseException('Merge items must be arrays.', $this->getRealCurrentLineNb() + 1, $parsedItem); + } + $merged = array_merge($parsedItem, $merged); + } + } else { + // Associative array, merge + $merged = array_merge($merged, $parsed); + } + + $isProcessed = $merged; + } + } else if (isset($values['value']) && preg_match('#^&(?P[^ ]+) *(?P.*)#u', $values['value'], $matches)) { + $isRef = $matches['ref']; + $values['value'] = $matches['value']; + } + + if ($isProcessed) { + // Merge keys + $data = $isProcessed; + // hash + } else if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#')) { + // if next line is less indented or equal, then it means that the current value is null + if ($this->isNextLineIndented()) { + $data[$key] = null; + } else { + $c = $this->getRealCurrentLineNb() + 1; + $parser = new Parser($c); + $parser->refs =& $this->refs; + $data[$key] = $parser->parse($this->getNextEmbedBlock()); + } + } else { + if ($isInPlace) { + $data = $this->refs[$isInPlace]; + } else { + $data[$key] = $this->parseValue($values['value']); + } + } + } else { + // 1-liner followed by newline + if (2 == count($this->lines) && empty($this->lines[1])) { + try { + $value = Inline::parse($this->lines[0]); + } catch (ParseException $e) { + $e->setParsedLine($this->getRealCurrentLineNb() + 1); + $e->setSnippet($this->currentLine); + + throw $e; + } + + if (is_array($value)) { + $first = reset($value); + if (is_string($first) && '*' === substr($first, 0, 1)) { + $data = array(); + foreach ($value as $alias) { + $data[] = $this->refs[substr($alias, 1)]; + } + $value = $data; + } + } + + if (isset($mbEncoding)) { + mb_internal_encoding($mbEncoding); + } + + return $value; + } + + 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: + $error = 'Unable to parse.'; + } + + throw new ParseException($error, $this->getRealCurrentLineNb() + 1, $this->currentLine); + } + + if ($isRef) { + $this->refs[$isRef] = end($data); + } + } + + if (isset($mbEncoding)) { + mb_internal_encoding($mbEncoding); + } + + return empty($data) ? null : $data; + } + + /** + * Returns the current line number (takes the offset into account). + * + * @return integer The current line number + */ + private function getRealCurrentLineNb() + { + return $this->currentLineNb + $this->offset; + } + + /** + * Returns the current line indentation. + * + * @return integer The current line indentation + */ + private function getCurrentLineIndentation() + { + return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' ')); + } + + /** + * Returns the next embed block of YAML. + * + * @param integer $indentation The indent level at which the block is to be read, or null for default + * + * @return string A YAML string + * + * @throws ParseException When indentation problem are detected + */ + private function getNextEmbedBlock($indentation = null) + { + $this->moveToNextLine(); + + if (null === $indentation) { + $newIndent = $this->getCurrentLineIndentation(); + + if (!$this->isCurrentLineEmpty() && 0 == $newIndent) { + throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine); + } + } else { + $newIndent = $indentation; + } + + $data = array(substr($this->currentLine, $newIndent)); + + while ($this->moveToNextLine()) { + if ($this->isCurrentLineEmpty()) { + if ($this->isCurrentLineBlank()) { + $data[] = substr($this->currentLine, $newIndent); + } + + continue; + } + + $indent = $this->getCurrentLineIndentation(); + + if (preg_match('#^(?P *)$#', $this->currentLine, $match)) { + // empty line + $data[] = $match['text']; + } else if ($indent >= $newIndent) { + $data[] = substr($this->currentLine, $newIndent); + } else if (0 == $indent) { + $this->moveToPreviousLine(); + + break; + } else { + throw new ParseException('Indentation problem.', $this->getRealCurrentLineNb() + 1, $this->currentLine); + } + } + + return implode("\n", $data); + } + + /** + * Moves the parser to the next line. + * + * @return Boolean + */ + private function moveToNextLine() + { + if ($this->currentLineNb >= count($this->lines) - 1) { + return false; + } + + $this->currentLine = $this->lines[++$this->currentLineNb]; + + return true; + } + + /** + * Moves the parser to the previous line. + */ + private function moveToPreviousLine() + { + $this->currentLine = $this->lines[--$this->currentLineNb]; + } + + /** + * Parses a YAML value. + * + * @param string $value A YAML value + * + * @return mixed A PHP value + * + * @throws ParseException When reference does not exist + */ + private function parseValue($value) + { + if ('*' === substr($value, 0, 1)) { + 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->currentLine); + } + + return $this->refs[$value]; + } + + if (preg_match('/^(?P\||>)(?P\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P +#.*)?$/', $value, $matches)) { + $modifiers = isset($matches['modifiers']) ? $matches['modifiers'] : ''; + + return $this->parseFoldedScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), intval(abs($modifiers))); + } + + try { + return Inline::parse($value); + } catch (ParseException $e) { + $e->setParsedLine($this->getRealCurrentLineNb() + 1); + $e->setSnippet($this->currentLine); + + throw $e; + } + } + + /** + * Parses a folded scalar. + * + * @param string $separator The separator that was used to begin this folded scalar (| or >) + * @param string $indicator The indicator that was used to begin this folded scalar (+ or -) + * @param integer $indentation The indentation that was used to begin this folded scalar + * + * @return string The text value + */ + private function parseFoldedScalar($separator, $indicator = '', $indentation = 0) + { + $separator = '|' == $separator ? "\n" : ' '; + $text = ''; + + $notEOF = $this->moveToNextLine(); + + while ($notEOF && $this->isCurrentLineBlank()) { + $text .= "\n"; + + $notEOF = $this->moveToNextLine(); + } + + if (!$notEOF) { + return ''; + } + + if (!preg_match('#^(?P'.($indentation ? str_repeat(' ', $indentation) : ' +').')(?P.*)$#u', $this->currentLine, $matches)) { + $this->moveToPreviousLine(); + + return ''; + } + + $textIndent = $matches['indent']; + $previousIndent = 0; + + $text .= $matches['text'].$separator; + while ($this->currentLineNb + 1 < count($this->lines)) { + $this->moveToNextLine(); + + if (preg_match('#^(?P {'.strlen($textIndent).',})(?P.+)$#u', $this->currentLine, $matches)) { + if (' ' == $separator && $previousIndent != $matches['indent']) { + $text = substr($text, 0, -1)."\n"; + } + $previousIndent = $matches['indent']; + + $text .= str_repeat(' ', $diff = strlen($matches['indent']) - strlen($textIndent)).$matches['text'].($diff ? "\n" : $separator); + } else if (preg_match('#^(?P *)$#', $this->currentLine, $matches)) { + $text .= preg_replace('#^ {1,'.strlen($textIndent).'}#', '', $matches['text'])."\n"; + } else { + $this->moveToPreviousLine(); + + break; + } + } + + if (' ' == $separator) { + // replace last separator by a newline + $text = preg_replace('/ (\n*)$/', "\n$1", $text); + } + + switch ($indicator) { + case '': + $text = preg_replace('#\n+$#s', "\n", $text); + break; + case '+': + break; + case '-': + $text = preg_replace('#\n+$#s', '', $text); + break; + } + + return $text; + } + + /** + * Returns true if the next line is indented. + * + * @return Boolean Returns true if the next line is indented, false otherwise + */ + private function isNextLineIndented() + { + $currentIndentation = $this->getCurrentLineIndentation(); + $notEOF = $this->moveToNextLine(); + + while ($notEOF && $this->isCurrentLineEmpty()) { + $notEOF = $this->moveToNextLine(); + } + + if (false === $notEOF) { + return false; + } + + $ret = false; + if ($this->getCurrentLineIndentation() <= $currentIndentation) { + $ret = true; + } + + $this->moveToPreviousLine(); + + return $ret; + } + + /** + * Returns true if the current line is blank or if it is a comment line. + * + * @return Boolean Returns true if the current line is empty or if it is a comment line, false otherwise + */ + private function isCurrentLineEmpty() + { + return $this->isCurrentLineBlank() || $this->isCurrentLineComment(); + } + + /** + * Returns true if the current line is blank. + * + * @return Boolean Returns true if the current line is blank, false otherwise + */ + private function isCurrentLineBlank() + { + return '' == trim($this->currentLine, ' '); + } + + /** + * Returns true if the current line is a comment line. + * + * @return Boolean 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[0] === '#'; + } + + /** + * 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", $value); + + if (!preg_match("#\n$#", $value)) { + $value .= "\n"; + } + + // strip YAML header + $count = 0; + $value = preg_replace('#^\%YAML[: ][\d\.]+.*\n#su', '', $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 (...) + $value = preg_replace('#\.\.\.\s*$#s', '', $value); + } + + return $value; + } +}