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<?php |
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namespace BitWasp\Bitcoin\Script\Factory; |
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use BitWasp\Bitcoin\Math\Math; |
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use BitWasp\Bitcoin\Script\Interpreter\Number; |
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use BitWasp\Bitcoin\Script\Opcodes; |
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use BitWasp\Bitcoin\Script\Script; |
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use BitWasp\Bitcoin\Script\ScriptInterface; |
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use BitWasp\Bitcoin\Serializable; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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class ScriptCreator |
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{ |
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/** |
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* @var string |
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*/ |
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private $script = ''; |
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/** |
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* @var Opcodes |
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*/ |
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private $opcodes; |
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/** |
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* @var Math |
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*/ |
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private $math; |
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/** |
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* @param Math $math |
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* @param Opcodes $opcodes |
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* @param BufferInterface|null $buffer |
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*/ |
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public function __construct(Math $math, Opcodes $opcodes, BufferInterface $buffer = null) |
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{ |
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if ($buffer !== null) { |
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$this->script = $buffer->getBinary(); |
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} |
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$this->math = $math; |
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$this->opcodes = $opcodes; |
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} |
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/** |
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* @param int[]|\BitWasp\Bitcoin\Script\Interpreter\Number[]|BufferInterface[] $sequence |
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* @return $this |
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*/ |
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public function sequence(array $sequence) |
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{ |
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$new = new self($this->math, $this->opcodes, null); |
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foreach ($sequence as $operation) { |
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if (is_int($operation)) { |
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if (!$this->opcodes->offsetExists($operation)) { |
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throw new \RuntimeException('Unknown opcode'); |
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} |
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$new->script .= chr($operation); |
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} elseif ($operation instanceof Number) { |
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$new->push($operation->getBuffer()); |
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} elseif ($operation instanceof BufferInterface) { |
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$new->push($operation); |
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} elseif ($operation instanceof ScriptInterface) { |
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$new->concat($operation); |
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} else { |
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throw new \RuntimeException('Value must be an opcode/BufferInterface/Number'); |
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} |
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} |
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$this->concat($new->getScript()); |
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return $this; |
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} |
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/** |
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* Add an opcode to the script |
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* |
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* @param string $name |
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* @return $this |
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*/ |
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public function op($name) |
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{ |
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$code = $this->opcodes->getOpByName($name); |
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$this->script .= chr($code); |
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return $this; |
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} |
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/** |
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* Push data into the stack. |
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* |
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* @param $data |
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* @return $this |
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* @throws \Exception |
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*/ |
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public function push(BufferInterface $data) |
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{ |
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$length = $data->getSize(); |
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if ($length < Opcodes::OP_PUSHDATA1) { |
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$this->script .= pack('C', $length) . $data->getBinary(); |
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} else { |
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if ($length <= 0xff) { |
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$lengthSize = 1; |
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$code = 'C'; |
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} elseif ($length <= 0xffff) { |
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$lengthSize = 2; |
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$code = 'S'; |
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} else { |
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$lengthSize = 4; |
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$code = 'V'; |
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} |
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$opCode = constant("BitWasp\\Bitcoin\\Script\\Opcodes::OP_PUSHDATA" . $lengthSize); |
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$this->script .= pack('C', $opCode) . pack($code, $length) . $data->getBinary(); |
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} |
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return $this; |
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} |
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/** |
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* @param int $n |
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* @return $this |
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*/ |
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public function int($n) |
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{ |
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if ($n === 0) { |
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$this->script .= chr(Opcodes::OP_0); |
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} else if ($n === -1 || ($n >= 1 && $n <= 16)) { |
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$this->script .= chr(\BitWasp\Bitcoin\Script\encodeOpN($n)); |
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} else { |
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$this->push(Number::int($n)->getBuffer()); |
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} |
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return $this; |
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} |
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/** |
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* @param Serializable $object |
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* @return $this |
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*/ |
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public function pushSerializable(Serializable $object) |
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{ |
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$this->push($object->getBuffer()); |
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return $this; |
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} |
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/** |
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* @param ScriptInterface $script |
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* @return $this |
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*/ |
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public function concat(ScriptInterface $script) |
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{ |
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$this->script .= $script->getBinary(); |
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return $this; |
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} |
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/** |
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* @return ScriptInterface |
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*/ |
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public function getScript() |
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{ |
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return new Script(new Buffer($this->script, null, $this->math), $this->opcodes); |
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} |
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} |
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Bit-Wasp /
bitcoin-php
