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<?php |
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namespace SPSS\Sav\Record; |
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use SPSS\Buffer; |
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use SPSS\Exception; |
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use SPSS\Sav\Record; |
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use SPSS\Utils; |
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/** |
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* The value label records documented in this section are used for numeric and short string variables only. |
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* Long string variables may have value labels, but their value labels are recorded using a different record type |
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* |
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* @see \SPSS\Sav\Record\Info\LongStringValueLabels |
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*/ |
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class ValueLabel extends Record |
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{ |
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const TYPE = 3; |
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const LABEL_MAX_LENGTH = 255; |
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/** |
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* @var array |
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*/ |
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public $labels = []; |
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/** |
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* @var array |
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* A list of dictionary indexes of variables to which to apply the value labels |
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* String variables wider than 8 bytes may not be specified in this list. |
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*/ |
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public $indexes = []; |
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/** |
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* @var Variable[] |
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*/ |
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protected $variables = []; |
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/** |
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* @param array $variables |
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*/ |
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public function setVariables($variables) |
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{ |
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$this->variables = $variables; |
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} |
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/** |
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* @param Buffer $buffer |
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* @throws Exception |
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*/ |
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public function read(Buffer $buffer) |
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{ |
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/** @var int $labelCount Number of value labels present in this record. */ |
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$labelCount = $buffer->readInt(); |
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for ($i = 0; $i < $labelCount; $i++) { |
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// A numeric value or a short string value padded as necessary to 8 bytes in length. |
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$value = $buffer->readDouble(); |
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$labelLength = ord($buffer->read(1)); |
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$label = $buffer->readString(Utils::roundUp($labelLength + 1, 8) - 1); |
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$this->labels[] = [ |
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'value' => $value, |
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'label' => rtrim($label), |
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]; |
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} |
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// The value label variables record is always immediately followed after a value label record. |
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$recType = $buffer->readInt(); |
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if ($recType != 4) { |
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throw new Exception( |
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sprintf('Error reading Variable Index record: bad record type [%s]. Expecting Record Type 4.', $recType) |
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); |
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} |
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// Number of variables that the associated value labels from the value label record are to be applied. |
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$varCount = $buffer->readInt(); |
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for ($i = 0; $i < $varCount; $i++) { |
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$varIndex = $buffer->readInt() - 1; |
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// Decode values for short variables |
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if (isset($this->variables[$varIndex])) { |
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$varWidth = $this->variables[$varIndex]->width; |
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if ($varWidth > 0) { |
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foreach ($this->labels as $labelIdx => $label) { |
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$this->labels[$labelIdx]['value'] = rtrim(Utils::doubleToString($label['value'])); |
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} |
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} |
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} |
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$this->indexes[] = $varIndex; |
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} |
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} |
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/** |
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* @param Buffer $buffer |
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*/ |
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public function write(Buffer $buffer) |
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{ |
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$convertToDouble = false; |
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$varIndex = reset($this->indexes); |
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if ($varIndex !== false && isset($this->variables[$varIndex - 1])) { |
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$varWidth = $this->variables[$varIndex - 1]->width; |
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$convertToDouble = $varWidth > 0; |
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} |
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// Value label record. |
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$buffer->writeInt(self::TYPE); |
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$buffer->writeInt(count($this->labels)); |
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foreach ($this->labels as $item) { |
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$labelLength = min(mb_strlen($item['label']), self::LABEL_MAX_LENGTH); |
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$label = mb_substr($item['label'], 0, $labelLength); |
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$labelLengthBytes = mb_strlen($label, '8bit'); |
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while ($labelLengthBytes > 255) { |
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// Strip one char, can be multiple bytes |
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$label = mb_substr($label, 0, -1); |
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$labelLengthBytes = mb_strlen($label, '8bit'); |
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} |
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if ($convertToDouble) { |
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$item['value'] = Utils::stringToDouble($item['value']); |
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} |
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$buffer->writeDouble($item['value']); |
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$buffer->write(chr($labelLengthBytes)); |
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$buffer->writeString($label, Utils::roundUp($labelLengthBytes + 1, 8) - 1); |
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} |
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// Value label variable record. |
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$buffer->writeInt(4); |
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$buffer->writeInt(count($this->indexes)); |
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foreach ($this->indexes as $varIndex) { |
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$buffer->writeInt($varIndex); |
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} |
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} |
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} |
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collecthor /
spss
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