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<?php |
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/* |
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* Copyright (c) Nate Brunette. |
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* Distributed under the MIT License (http://opensource.org/licenses/MIT) |
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*/ |
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declare(strict_types=1); |
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namespace Tebru\Gson\Internal; |
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use JsonSerializable; |
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use Tebru\Gson\Element\JsonArray; |
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use Tebru\Gson\Element\JsonElement; |
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use Tebru\Gson\Element\JsonNull; |
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use Tebru\Gson\Element\JsonObject; |
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use Tebru\Gson\Element\JsonPrimitive; |
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use Tebru\Gson\JsonWritable; |
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/** |
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* Class JsonElementWriter |
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* |
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* @author Nate Brunette <[email protected]> |
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*/ |
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final class JsonElementWriter extends JsonWriter implements JsonSerializable |
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{ |
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/** |
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* Begin writing array |
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* |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function beginArray(): JsonWritable |
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{ |
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if ($this->stackSize > 0 && $this->stackStates[$this->stackSize - 1] === self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call beginArray() before name() during object serialization'); |
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} |
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$array = new JsonArray(); |
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$this->push($array); |
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$this->stack[] = $array; |
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$this->stackStates[$this->stackSize] = self::STATE_ARRAY; |
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$this->stackSize++; |
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$this->pathIndices[$this->pathIndex++]++; |
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$this->pathIndices[$this->pathIndex] = -1; |
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return $this; |
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} |
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/** |
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* End writing array |
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* |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function endArray(): JsonWritable |
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{ |
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if ($this->stackSize === 0 || $this->stackStates[$this->stackSize - 1] !== self::STATE_ARRAY) { |
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$this->assertionFailed('Cannot call endArray() if not serializing array'); |
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} |
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\array_pop($this->stack); |
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$this->stackSize--; |
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$this->pathIndex--; |
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return $this; |
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} |
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/** |
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* Begin writing object |
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* |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function beginObject(): JsonWritable |
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{ |
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if ($this->stackSize > 0 && $this->stackStates[$this->stackSize - 1] === self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call beginObject() before name() during object serialization'); |
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} |
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$class = new JsonObject(); |
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$this->push($class); |
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$this->stack[$this->stackSize] = $class; |
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$this->stackStates[$this->stackSize] = self::STATE_OBJECT_NAME; |
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$this->stackSize++; |
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$this->pathIndices[$this->pathIndex++]++; |
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$this->pathIndices[$this->pathIndex] = -1; |
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return $this; |
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} |
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/** |
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* End writing object |
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* |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function endObject(): JsonWritable |
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{ |
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if ($this->stackSize === 0 || $this->stackStates[$this->stackSize - 1] !== self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call endObject() if not serializing object'); |
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} |
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\array_pop($this->stack); |
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$this->stackSize--; |
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$this->pathNames[$this->pathIndex--] = null; |
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return $this; |
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} |
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/** |
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* Write an integer value |
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* |
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* @param int $value |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function writeInteger(int $value): JsonWritable |
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{ |
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if ($this->stackSize > 0 && $this->stackStates[$this->stackSize - 1] === self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call writeInteger() before name() during object serialization'); |
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} |
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$this->pathIndices[$this->pathIndex]++; |
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return $this->push(JsonPrimitive::create($value)); |
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} |
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/** |
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* Write a float value |
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* |
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* @param float $value |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function writeFloat(float $value): JsonWritable |
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{ |
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if ($this->stackSize > 0 && $this->stackStates[$this->stackSize - 1] === self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call writeFloat() before name() during object serialization'); |
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} |
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$this->pathIndices[$this->pathIndex]++; |
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return $this->push(JsonPrimitive::create($value)); |
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} |
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/** |
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* Write a string value |
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* |
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* @param string $value |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function writeString(string $value): JsonWritable |
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{ |
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if ($this->stackSize > 0 && $this->stackStates[$this->stackSize - 1] === self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call writeString() before name() during object serialization'); |
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} |
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$this->pathIndices[$this->pathIndex]++; |
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return $this->push(JsonPrimitive::create($value)); |
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} |
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/** |
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* Write a boolean value |
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* |
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* @param boolean $value |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function writeBoolean(bool $value): JsonWritable |
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{ |
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if ($this->stackSize > 0 && $this->stackStates[$this->stackSize - 1] === self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call writeBoolean() before name() during object serialization'); |
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} |
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$this->pathIndices[$this->pathIndex]++; |
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return $this->push(JsonPrimitive::create($value)); |
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} |
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/** |
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* Write a null value if we are serializing nulls, otherwise |
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* skip the value. If this is a property value, that property |
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* should be skipped as well. |
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* |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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public function writeNull(): JsonWritable |
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{ |
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if ($this->stackSize > 0 && $this->stackStates[$this->stackSize - 1] === self::STATE_OBJECT_NAME) { |
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$this->assertionFailed('Cannot call writeNull() before name() during object serialization'); |
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} |
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if ($this->serializeNull) { |
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$this->pathIndices[$this->pathIndex]++; |
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return $this->push(new JsonNull()); |
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} |
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// if we're not serializing nulls |
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if (null !== $this->pendingName) { |
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$this->stackStates[$this->stackSize - 1] = self::STATE_OBJECT_NAME; |
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$this->pendingName = null; |
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} |
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return $this; |
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} |
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/** |
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* Specify data which should be serialized to JSON |
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* |
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* @return mixed |
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*/ |
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public function jsonSerialize() |
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{ |
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if (null === $this->result) { |
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return null; |
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} |
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return $this->result->jsonSerialize(); |
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} |
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/** |
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* Get the result as a json element |
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* |
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* @return JsonElement |
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*/ |
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public function toJsonElement(): JsonElement |
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{ |
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return $this->result; |
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} |
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/** |
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* Push a value to the result or current array/object |
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* |
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* @param JsonElement $value |
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* @return JsonWritable |
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* @throws \LogicException |
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*/ |
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private function push(JsonElement $value): JsonWritable |
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{ |
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if (0 === $this->stackSize) { |
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if (null !== $this->result) { |
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$this->assertionFailed('Attempting to write two different types'); |
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} |
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$this->result = $value; |
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return $this; |
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} |
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switch ($this->stackStates[$this->stackSize - 1]) { |
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case self::STATE_OBJECT_VALUE: |
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/** @var JsonObject $element */ |
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$element = $this->stack[$this->stackSize - 1]; |
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$element->add($this->pendingName, $value); |
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$this->stackStates[$this->stackSize - 1] = self::STATE_OBJECT_NAME; |
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$this->pendingName = null; |
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break; |
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case self::STATE_ARRAY: |
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/** @var JsonArray $element */ |
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$element = $this->stack[$this->stackSize - 1]; |
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$element->addJsonElement($value); |
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$this->stackStates[$this->stackSize - 1] = self::STATE_ARRAY; |
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break; |
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} |
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return $this; |
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} |
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} |
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