Parser::rewind() - Code Metrics - Inspection of "Adding signing/verification tests" - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#333)

by thomas

created 2016-07-01 13:30 UTC

Parser::rewind() A

↳ Parent: Parser

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	3
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	2
nc	1
nop	0
dl	0
loc	4
ccs	3
cts	3
cp	1
crap	1
rs	10
c	0
b	0
f	0

<?php

namespace BitWasp\Bitcoin\Script\Parser;

use BitWasp\Bitcoin\Script\Opcodes;
use BitWasp\Bitcoin\Math\Math;
use BitWasp\Bitcoin\Script\ScriptInterface;
use BitWasp\Buffertools\Buffer;
use BitWasp\Buffertools\BufferInterface;

class Parser implements \Iterator
{
    /**
     * @var Math
     */
    private $math;

    /**
     * @var BufferInterface
     */
    private $empty;

    /**
     * @var ScriptInterface
     */
    private $script;

    /**
     * @var int
     */
    private $position = 0;

    /**
     * @var int
     */
    private $end = 0;

    /**
     * @var int
     */
    private $execPtr = 0;

    /**
     * @var string
     */
    private $data = '';

    /**
     * @var Operation[]
     */
    private $array = array();

    /**
     * ScriptParser constructor.
     * @param Math $math
     * @param ScriptInterface $script
     */
    public function __construct(Math $math, ScriptInterface $script)
    {
        $this->math = $math;
        $buffer = $script->getBuffer();
        $this->data = $buffer->getBinary();
        $this->end = $buffer->getSize();
        $this->script = $script;
        $this->empty = new Buffer('', 0, $math);
    }

    /**
     * @return int
     */
    public function getPosition()
    {
        return $this->position;
    }

    /**
     * @param string $packFormat
     * @param integer $strSize
     * @return array|bool
     */
    private function unpackSize($packFormat, $strSize)
    {
        if ($this->end - $this->position < $strSize) {
            return false;
        }

        $size = unpack($packFormat, substr($this->data, $this->position, $strSize));
        $size = $size[1];
        $this->position += $strSize;

        return $size;
    }

    /**
     * @param int $ptr
     * @return Operation
     */
    private function doNext($ptr)
    {
        if ($this->position >= $this->end) {
            throw new \RuntimeException('Position exceeds end of script!');
        }

        $opCode = ord($this->data[$this->position++]);
        $pushData = $this->empty;
        $dataSize = 0;

        if ($opCode <= Opcodes::OP_PUSHDATA4) {
            if ($opCode < Opcodes::OP_PUSHDATA1) {
                $dataSize = $opCode;
            } else if ($opCode === Opcodes::OP_PUSHDATA1) {
                $dataSize = $this->unpackSize('C', 1);
            } else if ($opCode === Opcodes::OP_PUSHDATA2) {
                $dataSize = $this->unpackSize('v', 2);
            } else {
                $dataSize = $this->unpackSize('V', 4);
            }

            $delta = ($this->end - $this->position);
            if ($dataSize === false || $delta < 0 || $delta < $dataSize) {
                throw new \RuntimeException('Failed to unpack data from Script');
            }

            if ($dataSize > 0) {
                $pushData = new Buffer(substr($this->data, $this->position, $dataSize), $dataSize, $this->math);
            }

            $this->position += $dataSize;
        }

        $this->array[$ptr] = new Operation($opCode, $pushData, $dataSize);

        return $this->array[$ptr];
    }

    /**
     *
     */
    public function rewind()
    {
        $this->execPtr = 0;
    }

    /**
     * @return Operation
     */
    public function current()
    {
        if (isset($this->array[$this->execPtr])) {
            $exec = $this->array[$this->execPtr];
        } else {
            $exec = $this->doNext($this->execPtr);
        }

        return $exec;
    }

    /**
     * @return int
     */
    public function key()
    {
        return $this->execPtr;
    }

    /**
     * @return Operation
     */
    public function next()
    {
        $ptr = $this->execPtr;
        if (isset($this->array[$ptr])) {
            $this->execPtr++;
            return $this->array[$ptr];
        }

        return null;
    }

    /**
     * @return bool
     */
    public function valid()
    {
        return isset($this->array[$this->execPtr]) || $this->position < $this->end;
    }

    /**
     * @return Operation[]
     */
    public function decode()
    {
        $result = [];
        foreach ($this as $operation) {
            $result[] = $operation;
        }

        return $result;
    }

    /**
     * @return string
     */
    public function getHumanReadable()
    {
        return implode(' ', array_map(
            function (Operation $operation) {
                return $operation->isPush()
                    ? $operation->getData()->getHex()
                    : $this->script->getOpcodes()->getOp($operation->getOp());
            },
            $this->decode()
        ));
    }
}


1		<?php
2
3		namespace BitWasp\Bitcoin\Script\Parser;
4
5		use BitWasp\Bitcoin\Script\Opcodes;
6		use BitWasp\Bitcoin\Math\Math;
7		use BitWasp\Bitcoin\Script\ScriptInterface;
8		use BitWasp\Buffertools\Buffer;
9		use BitWasp\Buffertools\BufferInterface;
10
11		class Parser implements \Iterator
12		{
13		/**
14		* @var Math
15		*/
16		private $math;
17
18		/**
19		* @var BufferInterface
20		*/
21		private $empty;
22
23		/**
24		* @var ScriptInterface
25		*/
26		private $script;
27
28		/**
29		* @var int
30		*/
31		private $position = 0;
32
33		/**
34		* @var int
35		*/
36		private $end = 0;
37
38		/**
39		* @var int
40		*/
41		private $execPtr = 0;
42
43		/**
44		* @var string
45		*/
46		private $data = '';
47
48		/**
49		* @var Operation[]
50		*/
51		private $array = array();
52
53		/**
54		* ScriptParser constructor.
55		* @param Math $math
56		* @param ScriptInterface $script
57		*/
58	3864	public function __construct(Math $math, ScriptInterface $script)
59		{
60	3864	$this->math = $math;
61	3864	$buffer = $script->getBuffer();
62	3864	$this->data = $buffer->getBinary();
63	3864	$this->end = $buffer->getSize();
64	3864	$this->script = $script;
65	3864	$this->empty = new Buffer('', 0, $math);
66	3864	}
67
68		/**
69		* @return int
70		*/
71	3	public function getPosition()
72		{
73	3	return $this->position;
74		}
75
76		/**
77		* @param string $packFormat
78		* @param integer $strSize
79		* @return array\|bool
80		*/
81	120	private function unpackSize($packFormat, $strSize)
82		{
83	120	if ($this->end - $this->position < $strSize) {
84		return false;
85		}
86
87	120	$size = unpack($packFormat, substr($this->data, $this->position, $strSize));
88	120	$size = $size[1];
89	120	$this->position += $strSize;
90
91	120	return $size;
92		}
93
94		/**
95		* @param int $ptr
96		* @return Operation
97		*/
98	3825	private function doNext($ptr)
99		{
100	3825	if ($this->position >= $this->end) {
101		throw new \RuntimeException('Position exceeds end of script!');
102		}
103
104	3825	$opCode = ord($this->data[$this->position++]);
105	3825	$pushData = $this->empty;
106	3825	$dataSize = 0;
107
108	3825	if ($opCode <= Opcodes::OP_PUSHDATA4) {
109	2808	if ($opCode < Opcodes::OP_PUSHDATA1) {
110	2745	$dataSize = $opCode;
111	1912	} else if ($opCode === Opcodes::OP_PUSHDATA1) {
112	63	$dataSize = $this->unpackSize('C', 1);
113	101	} else if ($opCode === Opcodes::OP_PUSHDATA2) {
114	45	$dataSize = $this->unpackSize('v', 2);
115	30	} else {
116	18	$dataSize = $this->unpackSize('V', 4);
117		}
118
119	2808	$delta = ($this->end - $this->position);
120	2808	if ($dataSize === false \|\| $delta < 0 \|\| $delta < $dataSize) {
121	12	throw new \RuntimeException('Failed to unpack data from Script');
122		}
123
124	2799	if ($dataSize > 0) {
125	2040	$pushData = new Buffer(substr($this->data, $this->position, $dataSize), $dataSize, $this->math);
126	1360	}
127
128	2799	$this->position += $dataSize;
129	1866	}
130
131	3816	$this->array[$ptr] = new Operation($opCode, $pushData, $dataSize);
132
133	3816	return $this->array[$ptr];
134		}
135
136		/**
137		*
138		*/
139	3843	public function rewind()
140		{
141	3843	$this->execPtr = 0;
142	3843	}
143
144		/**
145		* @return Operation
146		*/
147	3825	public function current()
148		{
149	3825	if (isset($this->array[$this->execPtr])) {
150		$exec = $this->array[$this->execPtr];
151		} else {
152	3825	$exec = $this->doNext($this->execPtr);
153		}
154
155	3816	return $exec;
156		}
157
158		/**
159		* @return int
160		*/
161		public function key()
162		{
163		return $this->execPtr;
164		}
165
166		/**
167		* @return Operation
168		*/
169	3735	public function next()
170		{
171	3735	$ptr = $this->execPtr;
172	3735	if (isset($this->array[$ptr])) {
173	3717	$this->execPtr++;
174	3717	return $this->array[$ptr];
175		}
176
177	18	return null;
178		}
179
180		/**
181		* @return bool
182		*/
183	3843	public function valid()
184		{
185	3843	return isset($this->array[$this->execPtr]) \|\| $this->position < $this->end;
186		}
187
188		/**
189		* @return Operation[]
190		*/
191	2001	public function decode()
192		{
193	2001	$result = [];
194	2001	foreach ($this as $operation) {
195	1983	$result[] = $operation;
196	1334	}
197
198	2001	return $result;
199		}
200
201		/**
202		* @return string
203		*/
204	351	public function getHumanReadable()
205		{
206	351	return implode(' ', array_map(
207	351	function (Operation $operation) {
208	351	return $operation->isPush()
209	304	? $operation->getData()->getHex()
210	351	: $this->script->getOpcodes()->getOp($operation->getOp());
211	351	},
212	351	$this->decode()
213	234	));
214		}
215		}
216

Bit-Wasp / bitcoin-php

Pull Request — master (#333)

Parser::rewind() A

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