CssTranslator::xpath() - Code Metrics - Inspection of "1.20 pre release." - servo-php/fluidxml - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — master ( 60319d...b48e8d )

by Daniele

created 2016-02-21 01:42 UTC

CssTranslator::xpath() B

↳ Parent: CssTranslator

Complexity

Conditions	4
Paths	2

Size

Total Lines	27
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes	3
Bugs	0	Features	0

Metric	Value
c	3
b	0
f	0
dl	0
loc	27
rs	8.5806
cc	4
eloc	17
nc	2
nop	1

<?php

namespace FluidXml;

class CssTranslator
{
        const TOKEN = '/{([[:alpha:]]+)(\d+)}/i';
        const MAP = [
                // Empty part of #id and .class
                [ '(?<=^|\s)      # The begining or an empty space.
                   (?=[.#\[])     # . | # | [',
                  '*',
                  'TAG',
                  false ],
                // #id
                [ '\#
                   ([\w\-]+)',
                  '[@id="\1"]',
                  'ID',
                  false ],
                // .class
                [ '\.
                   ([\w\-]+)',
                  '[ contains( concat(" ", normalize-space(@class), " "), concat(" ", "\1", " ") ) ]',
                  'CLASS',
                  false ],
                // [attr]
                [ '\[
                   ([\w\-]+)
                   \]',
                  '[@\1]',
                  'ATTR',
                  false ],
                // [attr="val"]
                [ '\[
                   ([\w\-]+)
                   =["\']
                   (.*)
                   ["\']
                   \]',
                  '[@\1="\2"]',
                  'ATTR',
                  false ],
                // ns|A
                [ '([\w\-]+)
                   \|
                   (?=\w)       # A namespace must be followed at least by a character.',
                  '\1:',
                  'NS',
                  false ],
                // :root
                [ ':root\b',
                  '/*',
                  'TAG',
                  false ],
                // A
                [ '(?<=^|\s|\})
                   ( [\w\-]+ | \* )',
                  '\1',
                  'TAG',
                  false ],
                // Aggregates the components of a tag in an expression.
                [ '({NS\d+})?
                   ({TAG\d+})
                   ((?:{ATTR\d+})*|)
                   ((?:{ID\d+})*|)
                   ((?:{CLASS\d+})*|)',
                  '\1\2\3\4\5',
                  'EXP',
                  false ],
                [ '({EXP\d+})
                   :first-child',
                  '*[1]/self::\1',
                  'EXP',
                  false ],
                // {} + {}
                [ '({EXP\d+})
                   \s* \+ \s*
                   ({EXP\d+})',
                  '\1/following-sibling::*[1]/self::\2',
                  'EXP',
                  true ],
                // {} ~ {}
                [ '({EXP\d+})
                   \s* \~ \s*
                   ({EXP\d+})',
                  '\1/following-sibling::*/self::\2',
                  'EXP',
                  true ],
                // {} > {}
                [ '({EXP\d+})
                   \s* > \s*
                   ({EXP\d+})',
                  '\1/\2',
                  'EXP',
                  true ],
                // {} {}
                [ '({EXP\d+})
                   \s+
                   ({EXP\d+})',
                  '\1//\2',
                  'EXP',
                  true ],
                // {}, {}
                [ '({EXP\d+})
                   \s* , \s*
                   ({EXP\d+})',
                  '\1|\2',
                  'EXP',
                  true ]
        ];

        public static function xpath($css)
        {
                $xpath = $css;

                $stack = [];
                $index = 0;

                foreach (self::MAP as $o) {
                        // The regexes have a common wrapper.
                        list($search, $replace, $id, $repeat) = $o;
                        $search = "/{$search}/xi";

                        do {
                                $prev_xpath = $xpath;
                                self::tokenize($search, $replace, $id, $xpath, $stack, $index);
                        } while ($repeat && $xpath !== $prev_xpath);
                }

                self::translateStack($stack, $xpath);

                $xpath = \trim($xpath);
                $xpath = ".//$xpath";
                $xpath = \str_replace('|', '|.//',   $xpath);
                $xpath = \str_replace('.///', '/', $xpath);

                return $xpath;
        }

        protected static function tokenize($search, $replace, $id, &$xpath, &$stack, &$index)
        {
                // The search can return 0, 1 or more fund patterns.
                $matches_count = \preg_match_all($search, $xpath, $matches, \PREG_SET_ORDER | \PREG_OFFSET_CAPTURE);

                // \PREG_OFFSET_CAPTURE calculates offsets starting from the begining of the string $xpath.
                // Rewriting $xpath from left (first matches) creates a mismatch between the calculated offsets
                // and the actual ones. This problem can be avoided rewriting $xpath from right (last matches).
                for ($i = $matches_count - 1; $i >= 0; --$i) {
                        $match = $matches[$i];

                        // The count of the groups must exclude the entire recognized string entry.
                        $groups_count = \count($match) - 1;

                        // $match[0] is the entire recognized string.
                        // $match[>0] are the captured groups.
                        // $match[n][0] is the actual string.
                        // $match[n][1] is the position of the string.
                        list($pattern, $pattern_pos) = $match[0];

                        $xpath = \substr_replace($xpath, "{{$id}{$index}}", $pattern_pos, \strlen($pattern));

                        $groups_values = [];
                        for ($ii = 1; $ii <= $groups_count; ++$ii) {
                                // 0 is the group value, 1 is the group position.
                                $groups_values[$ii] = $match[$ii][0];
                        }

                        $stack[$index] = [$replace, $groups_values, $pattern];
                        ++$index;
                }
        }

        protected static function translateStack(&$stack, &$xpath)
        {
                do {
                        $matches_count = \preg_match_all(self::TOKEN, $xpath, $matches, \PREG_SET_ORDER);

                        for ($i = 0; $i < $matches_count; ++$i) {
                                list($pattern, $type, $id) = $matches[$i];
<?php

function returnThreeValues() {
    return array('a', 'b', 'c');
}

list($a, $b, $c) = returnThreeValues();

print $a . " - " . $c;

                                $id = \intval($id);

                                list($replace, $groups) = $stack[$id];

                                foreach ($groups as $k => $v) {
                                        $replace = \str_replace("\\$k", $v, $replace);
                                }

                                $xpath = \str_replace("{{$type}{$id}}", $replace, $xpath);
                        }
                } while ($matches_count > 0);
        }
}


1			<?php
2
3			namespace FluidXml;
4
5			class CssTranslator
6			{
7			const TOKEN = '/{([[:alpha:]]+)(\d+)}/i';
8			const MAP = [
9			// Empty part of #id and .class
10			[ '(?<=^\|\s) # The begining or an empty space.
11			(?=[.#\[]) # . \| # \| [',
12			'*',
13			'TAG',
14			false ],
15			// #id
16			[ '\#
17			([\w\-]+)',
18			'[@id="\1"]',
19			'ID',
20			false ],
21			// .class
22			[ '\.
23			([\w\-]+)',
24			'[ contains( concat(" ", normalize-space(@class), " "), concat(" ", "\1", " ") ) ]',
25			'CLASS',
26			false ],
27			// [attr]
28			[ '\[
29			([\w\-]+)
30			\]',
31			'[@\1]',
32			'ATTR',
33			false ],
34			// [attr="val"]
35			[ '\[
36			([\w\-]+)
37			=["\']
38			(.*)
39			["\']
40			\]',
41			'[@\1="\2"]',
42			'ATTR',
43			false ],
44			// ns\|A
45			[ '([\w\-]+)
46			\\|
47			(?=\w) # A namespace must be followed at least by a character.',
48			'\1:',
49			'NS',
50			false ],
51			// :root
52			[ ':root\b',
53			'/*',
54			'TAG',
55			false ],
56			// A
57			[ '(?<=^\|\s\|\})
58			( [\w\-]+ \| \* )',
59			'\1',
60			'TAG',
61			false ],
62			// Aggregates the components of a tag in an expression.
63			[ '({NS\d+})?
64			({TAG\d+})
65			((?:{ATTR\d+})*\|)
66			((?:{ID\d+})*\|)
67			((?:{CLASS\d+})*\|)',
68			'\1\2\3\4\5',
69			'EXP',
70			false ],
71			[ '({EXP\d+})
72			:first-child',
73			'*[1]/self::\1',
74			'EXP',
75			false ],
76			// {} + {}
77			[ '({EXP\d+})
78			\s* \+ \s*
79			({EXP\d+})',
80			'\1/following-sibling::*[1]/self::\2',
81			'EXP',
82			true ],
83			// {} ~ {}
84			[ '({EXP\d+})
85			\s* \~ \s*
86			({EXP\d+})',
87			'\1/following-sibling::*/self::\2',
88			'EXP',
89			true ],
90			// {} > {}
91			[ '({EXP\d+})
92			\s* > \s*
93			({EXP\d+})',
94			'\1/\2',
95			'EXP',
96			true ],
97			// {} {}
98			[ '({EXP\d+})
99			\s+
100			({EXP\d+})',
101			'\1//\2',
102			'EXP',
103			true ],
104			// {}, {}
105			[ '({EXP\d+})
106			\s* , \s*
107			({EXP\d+})',
108			'\1\|\2',
109			'EXP',
110			true ]
111			];
112
113			public static function xpath($css)
114			{
115			$xpath = $css;
116
117			$stack = [];
118			$index = 0;
119
120			foreach (self::MAP as $o) {
121			// The regexes have a common wrapper.
122			list($search, $replace, $id, $repeat) = $o;
123			$search = "/{$search}/xi";
124
125			do {
126			$prev_xpath = $xpath;
127			self::tokenize($search, $replace, $id, $xpath, $stack, $index);
128			} while ($repeat && $xpath !== $prev_xpath);
129			}
130
131			self::translateStack($stack, $xpath);
132
133			$xpath = \trim($xpath);
134			$xpath = ".//$xpath";
135			$xpath = \str_replace('\|', '\|.//', $xpath);
136			$xpath = \str_replace('.///', '/', $xpath);
137
138			return $xpath;
139			}
140
141			protected static function tokenize($search, $replace, $id, &$xpath, &$stack, &$index)
142			{
143			// The search can return 0, 1 or more fund patterns.
144			$matches_count = \preg_match_all($search, $xpath, $matches, \PREG_SET_ORDER \| \PREG_OFFSET_CAPTURE);
145
146			// \PREG_OFFSET_CAPTURE calculates offsets starting from the begining of the string $xpath.
147			// Rewriting $xpath from left (first matches) creates a mismatch between the calculated offsets
148			// and the actual ones. This problem can be avoided rewriting $xpath from right (last matches).
149			for ($i = $matches_count - 1; $i >= 0; --$i) {
150			$match = $matches[$i];
151
152			// The count of the groups must exclude the entire recognized string entry.
153			$groups_count = \count($match) - 1;
154
155			// $match[0] is the entire recognized string.
156			// $match[>0] are the captured groups.
157			// $match[n][0] is the actual string.
158			// $match[n][1] is the position of the string.
159			list($pattern, $pattern_pos) = $match[0];
160
161			$xpath = \substr_replace($xpath, "{{$id}{$index}}", $pattern_pos, \strlen($pattern));
162
163			$groups_values = [];
164			for ($ii = 1; $ii <= $groups_count; ++$ii) {
165			// 0 is the group value, 1 is the group position.
166			$groups_values[$ii] = $match[$ii][0];
167			}
168
169			$stack[$index] = [$replace, $groups_values, $pattern];
170			++$index;
171			}
172			}
173
174			protected static function translateStack(&$stack, &$xpath)
175			{
176			do {
177			$matches_count = \preg_match_all(self::TOKEN, $xpath, $matches, \PREG_SET_ORDER);
178
179			for ($i = 0; $i < $matches_count; ++$i) {
180			list($pattern, $type, $id) = $matches[$i];
			0 ignored issues – show Unused Code introduced 2016-02-21 01:50 UTC by Report Bug Copy Issue Report The assignment to `$pattern` is unused. Consider omitting it like so `list($first,,$third)`. This checks looks for assignemnts to variables using the `list(...)` function, where not all assigned variables are subsequently used. Consider the following code example. <?php function returnThreeValues() { return array('a', 'b', 'c'); } list($a, $b, $c) = returnThreeValues(); print $a . " - " . $c; Only the variables `$a` and `$c` are used. There was no need to assign `$b`. Instead, the list call could have been. list($a,, $c) = returnThreeValues(); Loading history...
181
182			$id = \intval($id);
183
184			list($replace, $groups) = $stack[$id];
185
186			foreach ($groups as $k => $v) {
187			$replace = \str_replace("\\$k", $v, $replace);
188			}
189
190			$xpath = \str_replace("{{$type}{$id}}", $replace, $xpath);
191			}
192			} while ($matches_count > 0);
193			}
194			}
195

servo-php / fluidxml

Push — master ( 60319d...b48e8d )

CssTranslator::xpath() B

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