Parser::doNext() - Code Metrics - Inspection of "New Stack class" - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#191)

by thomas

created 2015-11-22 18:33 UTC

Parser::doNext() D

↳ Parent: Parser

Complexity

Conditions	9
Paths	11

Size

Total Lines	34
Code Lines	22

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	21
CRAP Score	9.0533

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	34
ccs	21
cts	23
cp	0.913
rs	4.9091
cc	9
eloc	22
nc	11
nop	1
crap	9.0533

<?php

namespace BitWasp\Bitcoin\Script\Parser;

use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Script\Opcodes;
use BitWasp\Bitcoin\Script\Parser\Operation;
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 - $this->position);
        return ! ($pdif < 0 || $pdif < $size);
    }

    /**
     * @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;

        if ($opCode === Opcodes::OP_0) {
            $pushData = new Buffer('', 0);
        } elseif ($opCode <= Opcodes::OP_PUSHDATA4) {
            if ($opCode < Opcodes::OP_PUSHDATA1) {
                $size = $opCode;
            } else if ($opCode === Opcodes::OP_PUSHDATA1) {
                $size = $this->unpackSize('C', 1);
            } else if ($opCode === Opcodes::OP_PUSHDATA2) {
                $size = $this->unpackSize('v', 2);
            } else {
                $size = $this->unpackSize('V', 4);
            }

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

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

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

        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 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\Script\Parser\Operation;
8		use BitWasp\Bitcoin\Math\Math;
9		use BitWasp\Bitcoin\Script\ScriptInterface;
10		use BitWasp\Buffertools\Buffer;
11
12		class Parser implements \Iterator
13		{
14		/**
15		* @var int
16		*/
17		private $position = 0;
18
19		/**
20		* @var int
21		*/
22		private $end = 0;
23
24		/**
25		* @var int
26		*/
27		private $execPtr = 0;
28
29		/**
30		* @var string
31		*/
32		private $data = '';
33
34		/**
35		* @var Operation[]
36		*/
37		private $array = array();
38
39		/**
40		* ScriptParser constructor.
41		* @param Math $math
42		* @param ScriptInterface $script
43		*/
44	1827	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...
45		{
46	1827	$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...
47	1827	$buffer = $script->getBuffer();
48	1827	$this->data = $buffer->getBinary();
49	1827	$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...
50	1827	$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...
51	1827	}
52
53		/**
54		* @return int
55		*/
56		public function getPosition()
57		{
58		return $this->position;
59		}
60
61		/**
62		* @param string $packFormat
63		* @param integer $strSize
64		* @return array\|bool
65		*/
66	54	private function unpackSize($packFormat, $strSize)
67		{
68	54	if ($this->end - $this->position < $strSize) {
69		return false;
70		}
71	54	$size = unpack($packFormat, substr($this->data, $this->position, $strSize));
72	54	$size = $size[1];
73	54	$this->position += $strSize;
74
75	54	return $size;
76		}
77
78		/**
79		* @param int $size
80		* @return bool
81		*/
82	651	private function validateSize($size)
83		{
84	651	$pdif = ($this->end - $this->position);
85	651	return ! ($pdif < 0 \|\| $pdif < $size);
86		}
87
88		/**
89		* @param int $ptr
90		* @return Operation
91		*/
92	1737	private function doNext($ptr)
93		{
94	1737	if ($this->math->cmp($this->position, $this->end) >= 0) {
95		throw new \RuntimeException('Position exceeds end of script!');
96		}
97
98	1737	$opCode = ord($this->data[$this->position++]);
99	1737	$pushData = null;
100
101	1737	if ($opCode === Opcodes::OP_0) {
102	216	$pushData = new Buffer('', 0);
103	1737	} elseif ($opCode <= Opcodes::OP_PUSHDATA4) {
104	651	if ($opCode < Opcodes::OP_PUSHDATA1) {
105	627	$size = $opCode;
106	651	} else if ($opCode === Opcodes::OP_PUSHDATA1) {
107	30	$size = $this->unpackSize('C', 1);
108	54	} else if ($opCode === Opcodes::OP_PUSHDATA2) {
109	12	$size = $this->unpackSize('v', 2);
110	12	} else {
111	12	$size = $this->unpackSize('V', 4);
112		}
113
114	651	if ($size === false \|\| $this->validateSize($size) === false) {
115		throw new \RuntimeException('Failed to unpack data from Script');
116		}
117
118	651	$pushData = new Buffer(substr($this->data, $this->position, $size), $size, $this->math);
119	651	$this->position += $size;
120	651	}
121
122	1737	$this->array[$ptr] = $result = new Operation($opCode, $pushData);
123
124	1737	return $result;
125		}
126
127		/**
128		*
129		*/
130	1791	public function rewind()
131		{
132	1791	$this->execPtr = 0;
133	1791	}
134
135		/**
136		* @return Operation
137		*/
138	1737	public function current()
139		{
140	1737	if (isset($this->array[$this->execPtr])) {
141		$exec = $this->array[$this->execPtr];
142		} else {
143	1737	$exec = $this->doNext($this->execPtr);
144		}
145
146	1737	return $exec;
147		}
148
149		/**
150		* @return int
151		*/
152		public function key()
153		{
154		return $this->execPtr;
155		}
156
157		/**
158		* @return Operation
159		*/
160	1089	public function next()
161		{
162	1089	$ptr = $this->execPtr;
163	1089	if (isset($this->array[$ptr])) {
164	1053	$this->execPtr++;
165	1053	return $this->array[$ptr];
166		}
167
168	36	return null;
169		}
170
171		/**
172		* @return bool
173		*/
174	1791	public function valid()
175		{
176	1791	return isset($this->array[$this->execPtr]) \|\| $this->position < $this->end;
177		}
178
179		/**
180		* returns a mix of Buffer objects and strings
181		*
182		* @return Buffer[]\|string[]
183		*/
184	1023	public function parse()
185		{
186	1023	$data = array();
187
188	1023	$it = $this;
189	1023	foreach ($it as $exec) {
190	987	$opCode = $exec->getOp();
191	987	if ($opCode == 0) {
192	186	$push = Buffer::hex('00', 1, $this->math);
193	987	} elseif ($opCode <= 78) {
194	597	$push = $exec->getData();
195	597	} else {
196		// None of these are pushdatas, so just an opcode
197	921	$push = $this->script->getOpcodes()->getOp($opCode);
198		}
199
200	981	$data[] = $push;
201	1017	}
202
203	1017	return $data;
204		}
205
206		/**
207		* @return string
208		*/
209	672	public function getHumanReadable()
210		{
211	672	$parse = $this->parse();
212
213	672	$array = array_map(
214	672	function ($value) {
215	672	return ($value instanceof Buffer)
216	672	? $value->getHex()
217	672	: $value;
218	672	},
219		$parse
220	672	);
221
222	672	return implode(' ', $array);
223		}
224		}
225

Bit-Wasp / bitcoin-php

Pull Request — master (#191)

Parser::doNext() D

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