588 lines
16 KiB
PHP
588 lines
16 KiB
PHP
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<?php
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namespace Symfony\Components\Yaml;
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/*
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* This file is part of the symfony package.
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* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Parser parses YAML strings to convert them to PHP arrays.
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*
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* @package symfony
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* @subpackage yaml
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* @author Fabien Potencier <fabien.potencier@symfony-project.com>
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*/
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class Parser
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{
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protected $offset = 0;
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protected $lines = array();
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protected $currentLineNb = -1;
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protected $currentLine = '';
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protected $refs = array();
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/**
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* Constructor
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*
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* @param integer $offset The offset of YAML document (used for line numbers in error messages)
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*/
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public function __construct($offset = 0)
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{
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$this->offset = $offset;
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}
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/**
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* Parses a YAML string to a PHP value.
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*
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* @param string $value A YAML string
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*
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* @return mixed A PHP value
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*
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* @throws \InvalidArgumentException If the YAML is not valid
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*/
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public function parse($value)
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{
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$this->currentLineNb = -1;
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$this->currentLine = '';
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$this->lines = explode("\n", $this->cleanup($value));
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$data = array();
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while ($this->moveToNextLine())
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{
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if ($this->isCurrentLineEmpty())
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{
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continue;
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}
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// tab?
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if (preg_match('#^\t+#', $this->currentLine))
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{
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throw new ParserException(sprintf('A YAML file cannot contain tabs as indentation at line %d (%s).', $this->getRealCurrentLineNb() + 1, $this->currentLine));
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}
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$isRef = $isInPlace = $isProcessed = false;
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if (preg_match('#^\-((?P<leadspaces>\s+)(?P<value>.+?))?\s*$#', $this->currentLine, $values))
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{
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if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#', $values['value'], $matches))
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{
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$isRef = $matches['ref'];
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$values['value'] = $matches['value'];
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}
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// array
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if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#'))
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{
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$c = $this->getRealCurrentLineNb() + 1;
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$parser = new Parser($c);
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$parser->refs =& $this->refs;
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$data[] = $parser->parse($this->getNextEmbedBlock());
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}
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else
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{
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if (isset($values['leadspaces'])
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&& ' ' == $values['leadspaces']
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&& preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"\{].*?) *\:(\s+(?P<value>.+?))?\s*$#', $values['value'], $matches))
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{
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// this is a compact notation element, add to next block and parse
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$c = $this->getRealCurrentLineNb();
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$parser = new Parser($c);
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$parser->refs =& $this->refs;
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$block = $values['value'];
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if (!$this->isNextLineIndented())
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{
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$block .= "\n".$this->getNextEmbedBlock($this->getCurrentLineIndentation() + 2);
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}
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$data[] = $parser->parse($block);
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}
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else
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{
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$data[] = $this->parseValue($values['value']);
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}
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}
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}
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else if (preg_match('#^(?P<key>'.Inline::REGEX_QUOTED_STRING.'|[^ \'"].*?) *\:(\s+(?P<value>.+?))?\s*$#', $this->currentLine, $values))
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{
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$key = Inline::parseScalar($values['key']);
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if ('<<' === $key)
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{
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if (isset($values['value']) && '*' === substr($values['value'], 0, 1))
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{
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$isInPlace = substr($values['value'], 1);
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if (!array_key_exists($isInPlace, $this->refs))
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{
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throw new ParserException(sprintf('Reference "%s" does not exist at line %s (%s).', $isInPlace, $this->getRealCurrentLineNb() + 1, $this->currentLine));
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}
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}
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else
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{
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if (isset($values['value']) && $values['value'] !== '')
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{
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$value = $values['value'];
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}
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else
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{
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$value = $this->getNextEmbedBlock();
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}
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$c = $this->getRealCurrentLineNb() + 1;
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$parser = new Parser($c);
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$parser->refs =& $this->refs;
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$parsed = $parser->parse($value);
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$merged = array();
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if (!is_array($parsed))
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{
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throw new ParserException(sprintf("YAML merge keys used with a scalar value instead of an array at line %s (%s)", $this->getRealCurrentLineNb() + 1, $this->currentLine));
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}
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else if (isset($parsed[0]))
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{
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// Numeric array, merge individual elements
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foreach (array_reverse($parsed) as $parsedItem)
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{
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if (!is_array($parsedItem))
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{
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throw new ParserException(sprintf("Merge items must be arrays at line %s (%s).", $this->getRealCurrentLineNb() + 1, $parsedItem));
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}
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$merged = array_merge($parsedItem, $merged);
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}
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}
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else
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{
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// Associative array, merge
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$merged = array_merge($merge, $parsed);
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}
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$isProcessed = $merged;
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}
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}
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else if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#', $values['value'], $matches))
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{
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$isRef = $matches['ref'];
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$values['value'] = $matches['value'];
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}
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if ($isProcessed)
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{
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// Merge keys
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$data = $isProcessed;
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}
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// hash
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else if (!isset($values['value']) || '' == trim($values['value'], ' ') || 0 === strpos(ltrim($values['value'], ' '), '#'))
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{
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// if next line is less indented or equal, then it means that the current value is null
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if ($this->isNextLineIndented())
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{
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$data[$key] = null;
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}
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else
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{
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$c = $this->getRealCurrentLineNb() + 1;
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$parser = new Parser($c);
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$parser->refs =& $this->refs;
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$data[$key] = $parser->parse($this->getNextEmbedBlock());
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}
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}
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else
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{
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if ($isInPlace)
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{
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$data = $this->refs[$isInPlace];
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}
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else
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{
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$data[$key] = $this->parseValue($values['value']);
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}
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}
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}
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else
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{
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// 1-liner followed by newline
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if (2 == count($this->lines) && empty($this->lines[1]))
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{
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$value = Inline::load($this->lines[0]);
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if (is_array($value))
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{
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$first = reset($value);
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if ('*' === substr($first, 0, 1))
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{
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$data = array();
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foreach ($value as $alias)
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{
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$data[] = $this->refs[substr($alias, 1)];
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}
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$value = $data;
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}
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}
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return $value;
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}
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switch (preg_last_error())
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{
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case PREG_INTERNAL_ERROR:
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$error = 'Internal PCRE error on line';
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break;
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case PREG_BACKTRACK_LIMIT_ERROR:
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$error = 'pcre.backtrack_limit reached on line';
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break;
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case PREG_RECURSION_LIMIT_ERROR:
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$error = 'pcre.recursion_limit reached on line';
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break;
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case PREG_BAD_UTF8_ERROR:
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$error = 'Malformed UTF-8 data on line';
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break;
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case PREG_BAD_UTF8_OFFSET_ERROR:
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$error = 'Offset doesn\'t correspond to the begin of a valid UTF-8 code point on line';
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break;
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default:
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$error = 'Unable to parse line';
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}
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throw new ParserException(sprintf('%s %d (%s).', $error, $this->getRealCurrentLineNb() + 1, $this->currentLine));
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}
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if ($isRef)
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{
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$this->refs[$isRef] = end($data);
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}
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}
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return empty($data) ? null : $data;
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}
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/**
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* Returns the current line number (takes the offset into account).
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*
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* @return integer The current line number
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*/
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protected function getRealCurrentLineNb()
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{
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return $this->currentLineNb + $this->offset;
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}
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/**
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* Returns the current line indentation.
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*
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* @return integer The current line indentation
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*/
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protected function getCurrentLineIndentation()
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{
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return strlen($this->currentLine) - strlen(ltrim($this->currentLine, ' '));
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}
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/**
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* Returns the next embed block of YAML.
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*
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* @param integer $indentation The indent level at which the block is to be read, or null for default
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*
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* @return string A YAML string
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*/
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protected function getNextEmbedBlock($indentation = null)
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{
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$this->moveToNextLine();
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if (null === $indentation)
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{
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$newIndent = $this->getCurrentLineIndentation();
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if (!$this->isCurrentLineEmpty() && 0 == $newIndent)
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{
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throw new ParserException(sprintf('Indentation problem at line %d (%s)', $this->getRealCurrentLineNb() + 1, $this->currentLine));
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}
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}
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else
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{
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$newIndent = $indentation;
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}
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$data = array(substr($this->currentLine, $newIndent));
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while ($this->moveToNextLine())
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{
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if ($this->isCurrentLineEmpty())
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{
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if ($this->isCurrentLineBlank())
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{
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$data[] = substr($this->currentLine, $newIndent);
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}
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continue;
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}
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$indent = $this->getCurrentLineIndentation();
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if (preg_match('#^(?P<text> *)$#', $this->currentLine, $match))
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{
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// empty line
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$data[] = $match['text'];
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}
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else if ($indent >= $newIndent)
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{
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$data[] = substr($this->currentLine, $newIndent);
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}
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else if (0 == $indent)
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{
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$this->moveToPreviousLine();
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break;
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}
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else
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{
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throw new ParserException(sprintf('Indentation problem at line %d (%s)', $this->getRealCurrentLineNb() + 1, $this->currentLine));
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}
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}
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return implode("\n", $data);
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}
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/**
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* Moves the parser to the next line.
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*/
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protected function moveToNextLine()
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{
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if ($this->currentLineNb >= count($this->lines) - 1)
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{
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return false;
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}
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$this->currentLine = $this->lines[++$this->currentLineNb];
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return true;
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}
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/**
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* Moves the parser to the previous line.
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*/
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protected function moveToPreviousLine()
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{
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$this->currentLine = $this->lines[--$this->currentLineNb];
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}
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/**
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* Parses a YAML value.
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*
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* @param string $value A YAML value
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*
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* @return mixed A PHP value
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*/
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protected function parseValue($value)
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{
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if ('*' === substr($value, 0, 1))
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{
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if (false !== $pos = strpos($value, '#'))
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{
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$value = substr($value, 1, $pos - 2);
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}
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else
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{
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$value = substr($value, 1);
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}
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if (!array_key_exists($value, $this->refs))
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{
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throw new ParserException(sprintf('Reference "%s" does not exist (%s).', $value, $this->currentLine));
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}
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return $this->refs[$value];
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}
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if (preg_match('/^(?P<separator>\||>)(?P<modifiers>\+|\-|\d+|\+\d+|\-\d+|\d+\+|\d+\-)?(?P<comments> +#.*)?$/', $value, $matches))
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{
|
||
|
|
$modifiers = isset($matches['modifiers']) ? $matches['modifiers'] : '';
|
||
|
|
|
||
|
|
return $this->parseFoldedScalar($matches['separator'], preg_replace('#\d+#', '', $modifiers), intval(abs($modifiers)));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return Inline::load($value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 $indentation The indentation that was used to begin this folded scalar
|
||
|
|
*
|
||
|
|
* @return string The text value
|
||
|
|
*/
|
||
|
|
protected function parseFoldedScalar($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<indent>'.($indentation ? str_repeat(' ', $indentation) : ' +').')(?P<text>.*)$#', $this->currentLine, $matches))
|
||
|
|
{
|
||
|
|
$this->moveToPreviousLine();
|
||
|
|
|
||
|
|
return '';
|
||
|
|
}
|
||
|
|
|
||
|
|
$textIndent = $matches['indent'];
|
||
|
|
$previousIndent = 0;
|
||
|
|
|
||
|
|
$text .= $matches['text'].$separator;
|
||
|
|
while ($this->currentLineNb + 1 < count($this->lines))
|
||
|
|
{
|
||
|
|
$this->moveToNextLine();
|
||
|
|
|
||
|
|
if (preg_match('#^(?P<indent> {'.strlen($textIndent).',})(?P<text>.+)$#', $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" : $separator);
|
||
|
|
}
|
||
|
|
else if (preg_match('#^(?P<text> *)$#', $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
|
||
|
|
*/
|
||
|
|
protected 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
|
||
|
|
*/
|
||
|
|
protected function isCurrentLineEmpty()
|
||
|
|
{
|
||
|
|
return $this->isCurrentLineBlank() || $this->isCurrentLineComment();
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns true if the current line is blank.
|
||
|
|
*
|
||
|
|
* @return Boolean Returns true if the current line is blank, false otherwise
|
||
|
|
*/
|
||
|
|
protected function isCurrentLineBlank()
|
||
|
|
{
|
||
|
|
return '' == trim($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
|
||
|
|
*/
|
||
|
|
protected 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 $value The input YAML string
|
||
|
|
*
|
||
|
|
* @return string A cleaned up YAML string
|
||
|
|
*/
|
||
|
|
protected function cleanup($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#s', '', $value, -1, $count);
|
||
|
|
$this->offset += $count;
|
||
|
|
|
||
|
|
// remove leading comments and/or ---
|
||
|
|
$trimmedValue = preg_replace('#^((\#.*?\n)|(\-\-\-.*?\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;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $value;
|
||
|
|
}
|
||
|
|
}
|