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<?php declare(strict_types=1); |
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namespace JSKOS; |
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/** |
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* Provide consistent JSON(-LD) serializing. |
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*/ |
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abstract class PrettyJsonSerializable implements \JsonSerializable |
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{ |
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const DEFAULT_CONTEXT = 'https://gbv.github.io/jskos/context.json'; |
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/** |
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* Returns data which should be serialized to JSON. |
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* |
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* Delegates to jsonLDSerialize which can be called with a JSON-LD context URL. |
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*/ |
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public function jsonSerialize() |
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{ |
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return $this->jsonLDSerialize(); |
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} |
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/** |
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* Returns data which should be serialized to JSON. |
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* |
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* Include all non-null members and the JSON-LD context (`@context`). |
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* Keys are sorted by Unicode codepoint for stable output. |
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* |
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* @param string $context optional JSON-LD context URL. Use empty string to omit. |
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*/ |
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public function jsonLDSerialize(string $context=self::DEFAULT_CONTEXT) |
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{ |
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$json = [ ]; |
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foreach ($this as $key => $value) { |
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if (isset($value)) { |
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if ($value instanceof PrettyJsonSerializable) { |
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$value = $value->jsonLDSerialize(''); |
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} elseif (is_array($value) and !count(array_filter(array_keys($value), 'is_string'))) { |
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$a = []; |
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foreach ($value as $m) { |
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if ($m instanceof PrettyJsonSerializable) { |
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$m = $m->jsonLDSerialize(''); |
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} |
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$a[] = $m; |
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} |
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$value = $a; |
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} |
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$json[$key] = $value; |
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} |
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} |
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if ($context) { |
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$json['@context'] = $context; |
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$types = defined(get_called_class().'::TYPES') ? static::TYPES : []; |
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if (property_exists($this, 'type') and count($types)) { |
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if (isset($json['type'])) { |
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if (empty(array_intersect($json['type'], $types))) { |
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array_unshift($json['type'], $types[0]); |
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} |
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} else { |
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$json['type'] = [$types[0]]; |
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} |
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} |
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} |
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ksort($json); |
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return $json; |
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} |
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/** |
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* Serialize to JSON in string context. |
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*/ |
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public function __toString() |
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{ |
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return json_encode($this, JSON_UNESCAPED_SLASHES); |
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} |
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/** |
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* Serialize to pretty-printed JSON. |
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*/ |
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public function json() |
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{ |
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return json_encode($this, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES); |
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} |
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} |
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gbv /
jskos-php
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