TokenStream::readNext() - Code Metrics - Inspection of "Better structure" - koesie10/LuaSerializer - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 0f10a6...8f1e95 )

by Koen

created 2015-12-22 11:51 UTC

TokenStream::readNext() C

↳ Parent: TokenStream

Complexity

Conditions	8
Paths	8

Size

Total Lines	27
Code Lines	19

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	16
CRAP Score	8.512

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	27
ccs	16
cts	20
cp	0.8
rs	5.3846
cc	8
eloc	19
nc	8
nop	0
crap	8.512

<?php

namespace Vlaswinkel\Lua;

/**
 * Class TokenStream
 *
 * @see     http://lisperator.net/pltut/parser/token-stream
 *
 * @author  Koen Vlaswinkel <[email protected]>
 * @package Vlaswinkel\Lua
 */
class TokenStream {
    private $current = null;
    /**
     * @var InputStream
     */
    private $input;

    /**
     * TokenStream constructor.
     *
     * @param InputStream $input
     */
    public function __construct(InputStream $input) {
        $this->input = $input;
    }

    /**
     * @return Token
     */
    public function next() {
        $token         = $this->current;
        $this->current = null;
        if ($token) {
            return $token;
        }
        return $this->readNext();
    }

    /**
     * @return bool
     */
    public function eof() {
        return $this->peek() == null;
    }

    /**
     * @return Token

     */
    public function peek() {
        if ($this->current) {
            return $this->current;
        }
        $this->current = $this->readNext();
        return $this->current;
    }

    /**
     * @param string $msg
     *
     * @throws ParseException
     */
    public function error($msg) {
        $this->input->error($msg);
    }

    /**
     * @return Token

     * @throws ParseException
     */
    protected function readNext() {
        $this->readWhile([$this, 'isWhitespace']);
        if ($this->input->eof()) {
            return null;
        }
        $char = $this->input->peek();
        if ($char == "--") {
            $this->skipComment();
            return $this->readNext();
        }
        if ($char == '"') {
            return $this->readDoubleQuotedString();
        }
        if ($char == '\'') {
            return $this->readSingleQuotedString();
        }
        if ($this->isDigit($char)) {
            return $this->readNumber();
        }
        if ($this->isStartIdentifierCharacter($char)) {
            return $this->readIdentifier();
        }
        if ($this->isPunctuation($char)) {
            return $this->readPunctuation();
        }
        $this->input->error('Cannot handle character: ' . $char . ' (ord: ' . ord($char) . ')');
    }

    protected function skipComment() {
        $this->readWhile(
            function ($char) {
                return $char != "\n";
            }
        );
        $this->input->next();
    }

    /**
     * @return Token
     */
    protected function readDoubleQuotedString() {
        return new Token(Token::TYPE_STRING, $this->readEscaped('"'));
    }

    /**
     * @return Token
     */
    protected function readSingleQuotedString() {
        return new Token(Token::TYPE_STRING, $this->readEscaped('\''));
    }

    /**
     * @param string $end
     *
     * @return string
     */
    protected function readEscaped($end) {
        $escaped = false;
        $str     = "";
        $this->input->next();
        while (!$this->input->eof()) {
            $char = $this->input->next();
            if ($escaped) {
                $str .= $char;
                $escaped = false;
            } else {
                if ($char == "\\") {
                    $escaped = true;
                } else {
                    if ($char == $end) {
                        break;
                    } else {
                        $str .= $char;
                    }
                }
            }
        }
        return $str;
    }

    /**
     * @return Token
     */
    protected function readNumber() {
        $hasDot = false;
        $number = $this->readWhile(
            function ($char) use (&$hasDot) {
                if ($char == '.') {
                    if ($hasDot) {
                        return false;
                    }
                    $hasDot = true;
                    return true;
                }
                return $this->isDigit($char);
            }
        );
        return new Token(Token::TYPE_NUMBER, $hasDot ? floatval($number) : intval($number));
    }

    /**
     * @return Token
     */
    protected function readIdentifier() {
        $first      = false;
        $identifier = $this->readWhile(
            function ($char) use (&$first) {
                if ($first) {
                    $first = false;
                    return $this->isStartIdentifierCharacter($char);
                }
                return $this->isIdentifierCharacter($char);
            }
        );
        if ($this->isKeyword($identifier)) {
            return new Token(Token::TYPE_KEYWORD, $identifier);
        }
        return new Token(Token::TYPE_IDENTIFIER, $identifier);
    }

    /**
     * @return Token
     */
    protected function readPunctuation() {
        return new Token(Token::TYPE_PUNCTUATION, $this->input->next());
    }

    /**
     * @param callable $predicate
     *
     * @return string
     */
    protected function readWhile(callable $predicate) {
        $str = "";
        while (!$this->input->eof() && call_user_func($predicate, $this->input->peek())) {
            $str .= $this->input->next();
        }
        return $str;
    }

    protected function isWhitespace($char) {
        return strpos(" \t\n\r", $char) !== false;
    }

    /**
     * @param string $char
     *
     * @return bool
     */
    protected function isDigit($char) {
        return is_numeric($char);
    }

    /**
     * @param string $char
     *
     * @return bool
     */
    protected function isStartIdentifierCharacter($char) {
        return preg_match('/[a-zA-Z_]/', $char) === 1;
    }

    /**
     * @param string $char
     *
     * @return bool
     */
    protected function isIdentifierCharacter($char) {
        return preg_match('/[a-zA-Z0-9_]/', $char) === 1;
    }

    /**
     * @param string $char
     *
     * @return bool
     */
    protected function isPunctuation($char) {
        return strpos(",{}=[]", $char) !== false;
    }

    /**
     * @param string $text
     *
     * @return bool
     */
    protected function isKeyword($text) {
        return in_array($text, Lua::$luaKeywords);
    }
}

1		<?php
2
3		namespace Vlaswinkel\Lua;
4
5		/**
6		* Class TokenStream
7		*
8		* @see http://lisperator.net/pltut/parser/token-stream
9		*
10		* @author Koen Vlaswinkel <[email protected]>
11		* @package Vlaswinkel\Lua
12		*/
13		class TokenStream {
14		private $current = null;
15		/**
16		* @var InputStream
17		*/
18		private $input;
19
20		/**
21		* TokenStream constructor.
22		*
23		* @param InputStream $input
24		*/
25	21	public function __construct(InputStream $input) {
26	21	$this->input = $input;
27	21	}
28
29		/**
30		* @return Token
31		*/
32	21	public function next() {
33	21	$token = $this->current;
34	21	$this->current = null;
35	21	if ($token) {
36	13	return $token;
37		}
38	8	return $this->readNext();
39		}
40
41		/**
42		* @return bool
43		*/
44	6	public function eof() {
45	6	return $this->peek() == null;
46		}
47
48		/**
49		* @return Token
		0 ignored issues – show Documentation introduced 2015-12-22 12:03 UTC by Report Bug Copy Issue Report Should the return type not be `Token\|null`? This check compares the return type specified in the `@return` annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch. Loading history...
50		*/
51	13	public function peek() {
52	13	if ($this->current) {
53	13	return $this->current;
54		}
55	13	$this->current = $this->readNext();
56	13	return $this->current;
57		}
58
59		/**
60		* @param string $msg
61		*
62		* @throws ParseException
63		*/
64	1	public function error($msg) {
65	1	$this->input->error($msg);
66		}
67
68		/**
69		* @return Token
		0 ignored issues – show Documentation introduced 2015-12-22 12:03 UTC by Report Bug Copy Issue Report Should the return type not be `Token\|null`? This check compares the return type specified in the `@return` annotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch. Loading history...
70		* @throws ParseException
71		*/
72	21	protected function readNext() {
73	21	$this->readWhile([$this, 'isWhitespace']);
74	21	if ($this->input->eof()) {
75		return null;
76		}
77	21	$char = $this->input->peek();
78	21	if ($char == "--") {
79		$this->skipComment();
80		return $this->readNext();
81		}
82	21	if ($char == '"') {
83	8	return $this->readDoubleQuotedString();
84		}
85	18	if ($char == '\'') {
86	1	return $this->readSingleQuotedString();
87		}
88	17	if ($this->isDigit($char)) {
89	6	return $this->readNumber();
90		}
91	13	if ($this->isStartIdentifierCharacter($char)) {
92	9	return $this->readIdentifier();
93		}
94	9	if ($this->isPunctuation($char)) {
95	8	return $this->readPunctuation();
96		}
97	1	$this->input->error('Cannot handle character: ' . $char . ' (ord: ' . ord($char) . ')');
98		}
99
100		protected function skipComment() {
101		$this->readWhile(
102		function ($char) {
103		return $char != "\n";
104		}
105		);
106		$this->input->next();
107		}
108
109		/**
110		* @return Token
111		*/
112	8	protected function readDoubleQuotedString() {
113	8	return new Token(Token::TYPE_STRING, $this->readEscaped('"'));
114		}
115
116		/**
117		* @return Token
118		*/
119	1	protected function readSingleQuotedString() {
120	1	return new Token(Token::TYPE_STRING, $this->readEscaped('\''));
121		}
122
123		/**
124		* @param string $end
125		*
126		* @return string
127		*/
128	9	protected function readEscaped($end) {
129	9	$escaped = false;
130	9	$str = "";
131	9	$this->input->next();
132	9	while (!$this->input->eof()) {
133	9	$char = $this->input->next();
134	9	if ($escaped) {
135		$str .= $char;
136		$escaped = false;
137		} else {
138	9	if ($char == "\\") {
139		$escaped = true;
140		} else {
141	9	if ($char == $end) {
142	9	break;
143		} else {
144	9	$str .= $char;
145		}
146		}
147		}
148	9	}
149	9	return $str;
150		}
151
152		/**
153		* @return Token
154		*/
155	6	protected function readNumber() {
156	6	$hasDot = false;
157	6	$number = $this->readWhile(
158		function ($char) use (&$hasDot) {
159	6	if ($char == '.') {
160	1	if ($hasDot) {
161		return false;
162		}
163	1	$hasDot = true;
164	1	return true;
165		}
166	6	return $this->isDigit($char);
167		}
168	6	);
169	6	return new Token(Token::TYPE_NUMBER, $hasDot ? floatval($number) : intval($number));
170		}
171
172		/**
173		* @return Token
174		*/
175	9	protected function readIdentifier() {
176	9	$first = false;
177	9	$identifier = $this->readWhile(
178	9	function ($char) use (&$first) {
179	9	if ($first) {
180		$first = false;
181		return $this->isStartIdentifierCharacter($char);
182		}
183	9	return $this->isIdentifierCharacter($char);
184		}
185	9	);
186	9	if ($this->isKeyword($identifier)) {
187	3	return new Token(Token::TYPE_KEYWORD, $identifier);
188		}
189	6	return new Token(Token::TYPE_IDENTIFIER, $identifier);
190		}
191
192		/**
193		* @return Token
194		*/
195	8	protected function readPunctuation() {
196	8	return new Token(Token::TYPE_PUNCTUATION, $this->input->next());
197		}
198
199		/**
200		* @param callable $predicate
201		*
202		* @return string
203		*/
204	21	protected function readWhile(callable $predicate) {
205	21	$str = "";
206	21	while (!$this->input->eof() && call_user_func($predicate, $this->input->peek())) {
207	13	$str .= $this->input->next();
208	13	}
209	21	return $str;
210		}
211
212	21	protected function isWhitespace($char) {
213	21	return strpos(" \t\n\r", $char) !== false;
214		}
215
216		/**
217		* @param string $char
218		*
219		* @return bool
220		*/
221	17	protected function isDigit($char) {
222	17	return is_numeric($char);
223		}
224
225		/**
226		* @param string $char
227		*
228		* @return bool
229		*/
230	13	protected function isStartIdentifierCharacter($char) {
231	13	return preg_match('/[a-zA-Z_]/', $char) === 1;
232		}
233
234		/**
235		* @param string $char
236		*
237		* @return bool
238		*/
239	9	protected function isIdentifierCharacter($char) {
240	9	return preg_match('/[a-zA-Z0-9_]/', $char) === 1;
241		}
242
243		/**
244		* @param string $char
245		*
246		* @return bool
247		*/
248	9	protected function isPunctuation($char) {
249	9	return strpos(",{}=[]", $char) !== false;
250		}
251
252		/**
253		* @param string $text
254		*
255		* @return bool
256		*/
257	9	protected function isKeyword($text) {
258	9	return in_array($text, Lua::$luaKeywords);
259		}
260		}

koesie10 / LuaSerializer

Push — master ( 0f10a6...8f1e95 )

TokenStream::readNext() C

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