Parser::rewind() - Code Metrics - Inspection of "Have Parser / Operation store pushdata size" - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#192)

by thomas

created 2015-11-23 01:08 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	1
Bugs	0	Features	0

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

<?php

namespace BitWasp\Bitcoin\Script\Parser;

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

class Parser implements \Iterator
{
    /**
     * @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 = Bitcoin::getMath();
class MyClass { }

$x = new MyClass();
$x->foo = true;
        $buffer = $script->getBuffer();
        $this->data = $buffer->getBinary();
        $this->end = $buffer->getSize();
class Id
{
    public $id;

    public function __construct($id)
    {
        $this->id = $id;
    }

}

class Account
{
    /** @var  Id $id */
    public $id;
}

$account_id = false;

if (starsAreRight()) {
    $account_id = new Id(42);
}

$account = new Account();
if ($account instanceof Id)
{
    $account->id = $account_id;
}
        $this->script = $script;
class MyClass { }

$x = new MyClass();
$x->foo = true;
    }

    /**
     * @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 $size
     * @return bool
     */
    private function validateSize($size)
    {
        $pdif = ($this->end - $this->position);
        $a = $pdif < 0;
        $b = $pdif < $size;
        $r = !($a || $b);

        return $r;
    }

    /**
     * @param int $ptr
     * @return Operation
     */
    private function doNext($ptr)
    {
        if ($this->math->cmp($this->position, $this->end) >= 0) {
            throw new \RuntimeException('Position exceeds end of script!');
        }

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

        if ($opCode === Opcodes::OP_0) {
            $pushData = new Buffer('', 0);
        } elseif ($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);
            }

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

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

            $this->position += $dataSize;
        }

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

        return $result;
    }

    /**
     *
     */
    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;
    }

    /**
     * returns a mix of Buffer objects and strings
     *
     * @return Buffer[]|string[]
     */
    public function parse()
    {
        $data = array();

        $it = $this;
        foreach ($it as $exec) {
            $opCode = $exec->getOp();
            if ($opCode == 0) {
                $push = Buffer::hex('00', 1, $this->math);
            } elseif ($opCode <= 78) {
                $push = $exec->getData();
            } else {
                // None of these are pushdatas, so just an opcode
                $push = $this->script->getOpcodes()->getOp($opCode);
            }

            $data[] = $push;
        }

        return $data;
    }

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

        return $result;
    }

    /**
     * @return string
     */
    public function getHumanReadable()
    {
        $parse = $this->parse();

        $array = array_map(
            function ($value) {
                return ($value instanceof Buffer)
                    ? $value->getHex()
                    : $value;
            },
            $parse
        );

        return implode(' ', $array);
    }
}


1		<?php
2
3		namespace BitWasp\Bitcoin\Script\Parser;
4
5		use BitWasp\Bitcoin\Bitcoin;
6		use BitWasp\Bitcoin\Script\Opcodes;
7		use BitWasp\Bitcoin\Math\Math;
8		use BitWasp\Bitcoin\Script\ScriptInterface;
9		use BitWasp\Buffertools\Buffer;
10
11		class Parser implements \Iterator
12		{
13		/**
14		* @var int
15		*/
16		private $position = 0;
17
18		/**
19		* @var int
20		*/
21		private $end = 0;
22
23		/**
24		* @var int
25		*/
26		private $execPtr = 0;
27
28		/**
29		* @var string
30		*/
31		private $data = '';
32
33		/**
34		* @var Operation[]
35		*/
36		private $array = array();
37
38		/**
39		* ScriptParser constructor.
40		* @param Math $math
41		* @param ScriptInterface $script
42		*/
43	1125	public function __construct(Math $math, ScriptInterface $script)
		0 ignored issues – show Unused Code introduced 2015-11-22 19:28 UTC by Report Bug Copy Issue Report The parameter `$math` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
44		{
45	1125	$this->math = Bitcoin::getMath();
		0 ignored issues – show Bug introduced 2015-11-22 19:28 UTC by Report Bug Copy Issue Report The property `math` does not exist. Did you maybe forget to declare it? In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code: class MyClass { } $x = new MyClass(); $x->foo = true; Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: class MyClass { public $foo; } $x = new MyClass(); $x->foo = true; Loading history...
46	1125	$buffer = $script->getBuffer();
47	1125	$this->data = $buffer->getBinary();
48	1125	$this->end = $buffer->getSize();
		0 ignored issues – show Documentation Bug introduced 2015-11-22 19:28 UTC by Report Bug Copy Issue Report It seems like `$buffer->getSize()` can also be of type `string`. However, the property `$end` is declared as type `integer`. Maybe add an additional type check? Our type inference engine has found a suspicous assignment of a value to a property. This check raises an issue when a value that can be of a mixed type is assigned to a property that is type hinted more strictly. For example, imagine you have a variable `$accountId` that can either hold an Id object or false (if there is no account id yet). Your code now assigns that value to the `id` property of an instance of the `Account` class. This class holds a proper account, so the id value must no longer be false. Either this assignment is in error or a type check should be added for that assignment. class Id { public $id; public function __construct($id) { $this->id = $id; } } class Account { /** @var Id $id */ public $id; } $account_id = false; if (starsAreRight()) { $account_id = new Id(42); } $account = new Account(); if ($account instanceof Id) { $account->id = $account_id; } Loading history...
49	1125	$this->script = $script;
		0 ignored issues – show Bug introduced 2015-11-22 19:28 UTC by Report Bug Copy Issue Report The property `script` does not exist. Did you maybe forget to declare it? In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code: class MyClass { } $x = new MyClass(); $x->foo = true; Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: class MyClass { public $foo; } $x = new MyClass(); $x->foo = true; Loading history...
50	1125	}
51
52		/**
53		* @return int
54		*/
55		public function getPosition()
56		{
57		return $this->position;
58		}
59
60		/**
61		* @param string $packFormat
62		* @param integer $strSize
63		* @return array\|bool
64		*/
65	54	private function unpackSize($packFormat, $strSize)
66		{
67	54	if ($this->end - $this->position < $strSize) {
68		return false;
69		}
70	54	$size = unpack($packFormat, substr($this->data, $this->position, $strSize));
71	54	$size = $size[1];
72	54	$this->position += $strSize;
73
74	54	return $size;
75		}
76
77		/**
78		* @param int $size
79		* @return bool
80		*/
81	633	private function validateSize($size)
82		{
83	633	$pdif = ($this->end - $this->position);
84	633	$a = $pdif < 0;
85	633	$b = $pdif < $size;
86	633	$r = !($a \|\| $b);
87
88	633	return $r;
89		}
90
91		/**
92		* @param int $ptr
93		* @return Operation
94		*/
95	1041	private function doNext($ptr)
96		{
97	1041	if ($this->math->cmp($this->position, $this->end) >= 0) {
98		throw new \RuntimeException('Position exceeds end of script!');
99		}
100
101	1041	$opCode = ord($this->data[$this->position++]);
102	1041	$pushData = null;
103	1041	$dataSize = 0;
104
105	1041	if ($opCode === Opcodes::OP_0) {
106	210	$pushData = new Buffer('', 0);
107	1041	} elseif ($opCode <= Opcodes::OP_PUSHDATA4) {
108	633	if ($opCode < Opcodes::OP_PUSHDATA1) {
109	609	$dataSize = $opCode;
110	633	} else if ($opCode === Opcodes::OP_PUSHDATA1) {
111	30	$dataSize = $this->unpackSize('C', 1);
112	54	} else if ($opCode === Opcodes::OP_PUSHDATA2) {
113	12	$dataSize = $this->unpackSize('v', 2);
114	12	} else {
115	12	$dataSize = $this->unpackSize('V', 4);
116		}
117
118	633	if ($dataSize === false \|\| $this->validateSize($dataSize) === false) {
119		throw new \RuntimeException('Failed to unpack data from Script');
120		}
121
122	633	$pushData = new Buffer(substr($this->data, $this->position, $dataSize), $dataSize, $this->math);
123
124	633	$this->position += $dataSize;
125	633	}
126
127	1041	$this->array[$ptr] = $result = new Operation($opCode, $pushData, $dataSize);
128
129	1041	return $result;
130		}
131
132		/**
133		*
134		*/
135	1083	public function rewind()
136		{
137	1083	$this->execPtr = 0;
138	1083	}
139
140		/**
141		* @return Operation
142		*/
143	1041	public function current()
144		{
145	1041	if (isset($this->array[$this->execPtr])) {
146		$exec = $this->array[$this->execPtr];
147		} else {
148	1041	$exec = $this->doNext($this->execPtr);
149		}
150
151	1041	return $exec;
152		}
153
154		/**
155		* @return int
156		*/
157		public function key()
158		{
159		return $this->execPtr;
160		}
161
162		/**
163		* @return Operation
164		*/
165	1065	public function next()
166		{
167	1065	$ptr = $this->execPtr;
168	1065	if (isset($this->array[$ptr])) {
169	1029	$this->execPtr++;
170	1029	return $this->array[$ptr];
171		}
172
173	36	return null;
174		}
175
176		/**
177		* @return bool
178		*/
179	1083	public function valid()
180		{
181	1083	return isset($this->array[$this->execPtr]) \|\| $this->position < $this->end;
182		}
183
184		/**
185		* returns a mix of Buffer objects and strings
186		*
187		* @return Buffer[]\|string[]
188		*/
189	915	public function parse()
190		{
191	915	$data = array();
192
193	915	$it = $this;
194	915	foreach ($it as $exec) {
195	903	$opCode = $exec->getOp();
196	903	if ($opCode == 0) {
197	162	$push = Buffer::hex('00', 1, $this->math);
198	903	} elseif ($opCode <= 78) {
199	519	$push = $exec->getData();
200	519	} else {
201		// None of these are pushdatas, so just an opcode
202	843	$push = $this->script->getOpcodes()->getOp($opCode);
203		}
204
205	897	$data[] = $push;
206	909	}
207
208	909	return $data;
209		}
210
211		/**
212		* @return Operation[]
213		*/
214	687	public function decode()
215		{
216	687	$result = [];
217	687	foreach ($this as $operation) {
218	651	$result[] = $operation;
219	687	}
220
221	687	return $result;
222		}
223
224		/**
225		* @return string
226		*/
227	672	public function getHumanReadable()
228		{
229	672	$parse = $this->parse();
230
231	672	$array = array_map(
232	672	function ($value) {
233	672	return ($value instanceof Buffer)
234	672	? $value->getHex()
235	672	: $value;
236	672	},
237		$parse
238	672	);
239
240	672	return implode(' ', $array);
241		}
242		}
243

Bit-Wasp / bitcoin-php

Pull Request — master (#192)

Parser::rewind() A

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