/** * Parses a YAML string to a PHP value. * * @param string A YAML string * * @return mixed A PHP value */ public function parse($value) { $this->value = $this->cleanup($value); $this->currentLineNb = -1; $this->currentLine = ''; $this->lines = explode("\n", $this->value); $data = array(); while ($this->moveToNextLine()) { if ($this->isCurrentLineEmpty()) { continue; } // tab? if (preg_match('#^\\t+#', $this->currentLine)) { throw new InvalidArgumentException(sprintf('A YAML file cannot contain tabs as indentation at line %d (%s).', $this->getRealCurrentLineNb() + 1, $this->currentLine)); } $isRef = $isInPlace = $isProcessed = false; if (preg_match('#^\\-(\\s+(?P<value>.+?))?\\s*$#', $this->currentLine, $values)) { if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#', $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; $parser = new YamlParser($c); $parser->refs =& $this->refs; $data[] = $parser->parse($this->getNextEmbedBlock()); } else { if (preg_match('/^([^ ]+)\\: +({.*?)$/', $values['value'], $matches)) { $data[] = array($matches[1] => YamlInline::load($matches[2])); } else { $data[] = $this->parseValue($values['value']); } } } else { if (preg_match('#^(?P<key>[^ ].*?) *\\:(\\s+(?P<value>.+?))?\\s*$#', $this->currentLine, $values)) { $key = YamlInline::parseScalar($values['key']); 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 InvalidArgumentException(sprintf('Reference "%s" does not exist at line %s (%s).', $isInPlace, $this->getRealCurrentLineNb() + 1, $this->currentLine)); } } else { if (isset($values['value']) && $values['value'] !== '') { $value = $values['value']; } else { $value = $this->getNextEmbedBlock(); } $c = $this->getRealCurrentLineNb() + 1; $parser = new YamlParser($c); $parser->refs =& $this->refs; $parsed = $parser->parse($value); $merged = array(); if (!is_array($parsed)) { throw new InvalidArgumentException(sprintf("YAML merge keys used with a scalar value instead of an array at line %s (%s)", $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 InvalidArgumentException(sprintf("Merge items must be arrays at line %s (%s).", $this->getRealCurrentLineNb() + 1, $parsedItem)); } $merged = array_merge($parsedItem, $merged); } } else { // Associative array, merge $merged = array_merge($merge, $parsed); } } $isProcessed = $merged; } } else { if (isset($values['value']) && preg_match('#^&(?P<ref>[^ ]+) *(?P<value>.*)#', $values['value'], $matches)) { $isRef = $matches['ref']; $values['value'] = $matches['value']; } } if ($isProcessed) { // Merge keys $data = $isProcessed; } else { if (!isset($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; $parser = new YamlParser($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 { // one liner? if (1 == count(explode("\n", rtrim($this->value, "\n")))) { $value = YamlInline::load($this->lines[0]); if (is_array($value)) { $first = reset($value); if ('*' === substr($first, 0, 1)) { $data = array(); foreach ($value as $alias) { $data[] = $this->refs[substr($alias, 1)]; } $value = $data; } } return $value; } throw new InvalidArgumentException(sprintf('Unable to parse line %d (%s).', $this->getRealCurrentLineNb() + 1, $this->currentLine)); } } if ($isRef) { $this->refs[$isRef] = end($data); } } return empty($data) ? null : $data; }