HTMLPurifier_EntityParser::substituteNonSpecialEntities() - Code Metrics - Inspection of "Merge pull request #1492 from mambax7/feature/HTML..." - XOOPS/XoopsCore25 - Measure and Improve Code Quality continuously with Scrutinizer

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by Michael

created 2025-01-05 17:32 UTC

substituteNonSpecialEntities() A

↳ Parent: HTMLPurifier_EntityParser

Complexity

Conditions	1
Paths	1

Size

Total Lines	7
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	4
dl	0
loc	7
rs	10
c	0
b	0
f	0
cc	1
nc	1
nop	1

<?php

// if want to implement error collecting here, we'll need to use some sort
// of global data (probably trigger_error) because it's impossible to pass
// $config or $context to the callback functions.

/**
 * Handles referencing and derefencing character entities
 */
class HTMLPurifier_EntityParser
{
    /**
     * Reference to entity lookup table.
     * @type HTMLPurifier_EntityLookup
     */
    protected $_entity_lookup;

    /**
     * Callback regex string for entities in text.
     * @type string
     */
    protected $_textEntitiesRegex;

    /**
     * Callback regex string for entities in attributes.
     * @type string
     */
    protected $_attrEntitiesRegex;

    /**
     * Tests if the beginning of a string is a semi-optional regex
     */
    protected $_semiOptionalPrefixRegex;

    public function __construct() {
        // From
        // http://stackoverflow.com/questions/15532252/why-is-reg-being-rendered-as-without-the-bounding-semicolon
        $semi_optional = "quot|QUOT|lt|LT|gt|GT|amp|AMP|AElig|Aacute|Acirc|Agrave|Aring|Atilde|Auml|COPY|Ccedil|ETH|Eacute|Ecirc|Egrave|Euml|Iacute|Icirc|Igrave|Iuml|Ntilde|Oacute|Ocirc|Ograve|Oslash|Otilde|Ouml|REG|THORN|Uacute|Ucirc|Ugrave|Uuml|Yacute|aacute|acirc|acute|aelig|agrave|aring|atilde|auml|brvbar|ccedil|cedil|cent|copy|curren|deg|divide|eacute|ecirc|egrave|eth|euml|frac12|frac14|frac34|iacute|icirc|iexcl|igrave|iquest|iuml|laquo|macr|micro|middot|nbsp|not|ntilde|oacute|ocirc|ograve|ordf|ordm|oslash|otilde|ouml|para|plusmn|pound|raquo|reg|sect|shy|sup1|sup2|sup3|szlig|thorn|times|uacute|ucirc|ugrave|uml|uuml|yacute|yen|yuml";

        // NB: three empty captures to put the fourth match in the right
        // place
        $this->_semiOptionalPrefixRegex = "/&()()()($semi_optional)/";

        $this->_textEntitiesRegex =
            '/&(?:' .
            // hex
            '[#]x([a-fA-F0-9]+);?|' .
            // dec
            '[#]0*(\d+);?|' .
            // string (mandatory semicolon)
            // NB: order matters: match semicolon preferentially
            '([A-Za-z_:][A-Za-z0-9.\-_:]*);|' .
            // string (optional semicolon)
            "($semi_optional)" .
            ')/';

        $this->_attrEntitiesRegex =
            '/&(?:' .
            // hex
            '[#]x([a-fA-F0-9]+);?|' .
            // dec
            '[#]0*(\d+);?|' .
            // string (mandatory semicolon)
            // NB: order matters: match semicolon preferentially
            '([A-Za-z_:][A-Za-z0-9.\-_:]*);|' .
            // string (optional semicolon)
            // don't match if trailing is equals or alphanumeric (URL
            // like)
            "($semi_optional)(?![=;A-Za-z0-9])" .
            ')/';

    }

    /**
     * Substitute entities with the parsed equivalents.  Use this on
     * textual data in an HTML document (as opposed to attributes.)
     *
     * @param string $string String to have entities parsed.
     * @return string Parsed string.
     */
    public function substituteTextEntities($string)
    {
        return preg_replace_callback(
            $this->_textEntitiesRegex,
            array($this, 'entityCallback'),
            $string
        );
    }

    /**
     * Substitute entities with the parsed equivalents.  Use this on
     * attribute contents in documents.
     *
     * @param string $string String to have entities parsed.
     * @return string Parsed string.
     */
    public function substituteAttrEntities($string)
    {
        return preg_replace_callback(
            $this->_attrEntitiesRegex,
            array($this, 'entityCallback'),
            $string
        );
    }

    /**
     * Callback function for substituteNonSpecialEntities() that does the work.
     *
     * @param array $matches PCRE matches array, with 0 the entire match, and
     *                       either index 1, 2 or 3 set with a hex value, dec value,
     *                       or string (respectively).
     * @return string Replacement string.
     */

    protected function entityCallback($matches)
    {
        $entity = $matches[0];
        $hex_part = isset($matches[1]) ? $matches[1] : null;
        $dec_part = isset($matches[2]) ? $matches[2] : null;
        $named_part = empty($matches[3]) ? (empty($matches[4]) ? "" : $matches[4]) : $matches[3];
        if ($hex_part !== null && $hex_part !== "") {
            return HTMLPurifier_Encoder::unichr(hexdec($hex_part));
        } elseif ($dec_part !== null && $dec_part !== "") {
            return HTMLPurifier_Encoder::unichr((int)$dec_part);
        } else {
            if (!$this->_entity_lookup) {
                $this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
            }
            if (isset($this->_entity_lookup->table[$named_part])) {
                return $this->_entity_lookup->table[$named_part];
            } else {
                // exact match didn't match anything, so test if
                // any of the semicolon optional match the prefix.
                // Test that this is an EXACT match is important to
                // prevent infinite loop
                if (!empty($matches[3])) {
                    return preg_replace_callback(
                        $this->_semiOptionalPrefixRegex,
                        array($this, 'entityCallback'),
                        $entity
                    );
                }
                return $entity;
            }
        }
    }

    // LEGACY CODE BELOW

    /**
     * Callback regex string for parsing entities.
     * @type string
     */
    protected $_substituteEntitiesRegex =
        '/&(?:[#]x([a-fA-F0-9]+)|[#]0*(\d+)|([A-Za-z_:][A-Za-z0-9.\-_:]*));?/';
    //     1. hex             2. dec      3. string (XML style)

    /**
     * Decimal to parsed string conversion table for special entities.
     * @type array
     */
    protected $_special_dec2str =
        array(
            34 => '"',
            38 => '&',
            39 => "'",
            60 => '<',
                    62 => '>'
        );

    /**
     * Stripped entity names to decimal conversion table for special entities.
     * @type array
     */
    protected $_special_ent2dec =
        array(
            'quot' => 34,
            'amp' => 38,
            'lt' => 60,
                    'gt'   => 62
        );

    /**
     * Substitutes non-special entities with their parsed equivalents. Since
     * running this whenever you have parsed character is t3h 5uck, we run
     * it before everything else.
     *
     * @param string $string String to have non-special entities parsed.
     * @return string Parsed string.
     */
    public function substituteNonSpecialEntities($string)
    {
        // it will try to detect missing semicolons, but don't rely on it
        return preg_replace_callback(
            $this->_substituteEntitiesRegex,
            array($this, 'nonSpecialEntityCallback'),
            $string
        );
    }

    /**
     * Callback function for substituteNonSpecialEntities() that does the work.
     *
     * @param array $matches PCRE matches array, with 0 the entire match, and
     *                       either index 1, 2 or 3 set with a hex value, dec value,
     *                       or string (respectively).
     * @return string Replacement string.
     */

    protected function nonSpecialEntityCallback($matches)
    {
        // replaces all but big five
        $entity = $matches[0];
        $is_num = (@$matches[0][1] === '#');
        if ($is_num) {
            $is_hex = (@$entity[2] === 'x');
            $code = $is_hex ? hexdec($matches[1]) : (int)$matches[2];
            // abort for special characters
            if (isset($this->_special_dec2str[$code])) {
                return $entity;
            }
            return HTMLPurifier_Encoder::unichr($code);
        } else {
            if (isset($this->_special_ent2dec[$matches[3]])) {
                return $entity;
            }
            if (!$this->_entity_lookup) {
                $this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
            }
            if (isset($this->_entity_lookup->table[$matches[3]])) {
                return $this->_entity_lookup->table[$matches[3]];
            } else {
                return $entity;
            }
        }
    }

    /**
     * Substitutes only special entities with their parsed equivalents.
     *
     * @notice We try to avoid calling this function because otherwise, it
     * would have to be called a lot (for every parsed section).
     *
     * @param string $string String to have non-special entities parsed.
     * @return string Parsed string.
     */
    public function substituteSpecialEntities($string)
    {
        return preg_replace_callback(
            $this->_substituteEntitiesRegex,
            array($this, 'specialEntityCallback'),
            $string
        );
    }

    /**
     * Callback function for substituteSpecialEntities() that does the work.
     *
     * This callback has same syntax as nonSpecialEntityCallback().
     *
     * @param array $matches PCRE-style matches array, with 0 the entire match, and
     *                       either index 1, 2 or 3 set with a hex value, dec value,
     *                       or string (respectively).
     * @return string Replacement string.
     */
    protected function specialEntityCallback($matches)
    {
        $entity = $matches[0];
        $is_num = (@$matches[0][1] === '#');
        if ($is_num) {
            $is_hex = (@$entity[2] === 'x');
            $int = $is_hex ? hexdec($matches[1]) : (int)$matches[2];
            return isset($this->_special_dec2str[$int]) ?
                $this->_special_dec2str[$int] :
                $entity;
        } else {
            return isset($this->_special_ent2dec[$matches[3]]) ?
                $this->_special_dec2str[$this->_special_ent2dec[$matches[3]]] :
                $entity;
        }
    }
}

// vim: et sw=4 sts=4


1			<?php
2
3			// if want to implement error collecting here, we'll need to use some sort
4			// of global data (probably trigger_error) because it's impossible to pass
5			// $config or $context to the callback functions.
6
7			/**
8			* Handles referencing and derefencing character entities
9			*/
10			class HTMLPurifier_EntityParser
11			{
12			/**
13			* Reference to entity lookup table.
14			* @type HTMLPurifier_EntityLookup
15			*/
16			protected $_entity_lookup;
17
18			/**
19			* Callback regex string for entities in text.
20			* @type string
21			*/
22			protected $_textEntitiesRegex;
23
24			/**
25			* Callback regex string for entities in attributes.
26			* @type string
27			*/
28			protected $_attrEntitiesRegex;
29
30			/**
31			* Tests if the beginning of a string is a semi-optional regex
32			*/
33			protected $_semiOptionalPrefixRegex;
34
35			public function __construct() {
36			// From
37			// http://stackoverflow.com/questions/15532252/why-is-reg-being-rendered-as-without-the-bounding-semicolon
38			$semi_optional = "quot\|QUOT\|lt\|LT\|gt\|GT\|amp\|AMP\|AElig\|Aacute\|Acirc\|Agrave\|Aring\|Atilde\|Auml\|COPY\|Ccedil\|ETH\|Eacute\|Ecirc\|Egrave\|Euml\|Iacute\|Icirc\|Igrave\|Iuml\|Ntilde\|Oacute\|Ocirc\|Ograve\|Oslash\|Otilde\|Ouml\|REG\|THORN\|Uacute\|Ucirc\|Ugrave\|Uuml\|Yacute\|aacute\|acirc\|acute\|aelig\|agrave\|aring\|atilde\|auml\|brvbar\|ccedil\|cedil\|cent\|copy\|curren\|deg\|divide\|eacute\|ecirc\|egrave\|eth\|euml\|frac12\|frac14\|frac34\|iacute\|icirc\|iexcl\|igrave\|iquest\|iuml\|laquo\|macr\|micro\|middot\|nbsp\|not\|ntilde\|oacute\|ocirc\|ograve\|ordf\|ordm\|oslash\|otilde\|ouml\|para\|plusmn\|pound\|raquo\|reg\|sect\|shy\|sup1\|sup2\|sup3\|szlig\|thorn\|times\|uacute\|ucirc\|ugrave\|uml\|uuml\|yacute\|yen\|yuml";
39
40			// NB: three empty captures to put the fourth match in the right
41			// place
42			$this->_semiOptionalPrefixRegex = "/&()()()($semi_optional)/";
43
44			$this->_textEntitiesRegex =
45			'/&(?:' .
46			// hex
47			'[#]x([a-fA-F0-9]+);?\|' .
48			// dec
49			'[#]0*(\d+);?\|' .
50			// string (mandatory semicolon)
51			// NB: order matters: match semicolon preferentially
52			'([A-Za-z_:][A-Za-z0-9.\-_:]*);\|' .
53			// string (optional semicolon)
54			"($semi_optional)" .
55			')/';
56
57			$this->_attrEntitiesRegex =
58			'/&(?:' .
59			// hex
60			'[#]x([a-fA-F0-9]+);?\|' .
61			// dec
62			'[#]0*(\d+);?\|' .
63			// string (mandatory semicolon)
64			// NB: order matters: match semicolon preferentially
65			'([A-Za-z_:][A-Za-z0-9.\-_:]*);\|' .
66			// string (optional semicolon)
67			// don't match if trailing is equals or alphanumeric (URL
68			// like)
69			"($semi_optional)(?![=;A-Za-z0-9])" .
70			')/';
71
72			}
73
74			/**
75			* Substitute entities with the parsed equivalents. Use this on
76			* textual data in an HTML document (as opposed to attributes.)
77			*
78			* @param string $string String to have entities parsed.
79			* @return string Parsed string.
80			*/
81			public function substituteTextEntities($string)
82			{
83			return preg_replace_callback(
84			$this->_textEntitiesRegex,
85			array($this, 'entityCallback'),
86			$string
87			);
88			}
89
90			/**
91			* Substitute entities with the parsed equivalents. Use this on
92			* attribute contents in documents.
93			*
94			* @param string $string String to have entities parsed.
95			* @return string Parsed string.
96			*/
97			public function substituteAttrEntities($string)
98			{
99			return preg_replace_callback(
100			$this->_attrEntitiesRegex,
101			array($this, 'entityCallback'),
102			$string
103			);
104			}
105
106			/**
107			* Callback function for substituteNonSpecialEntities() that does the work.
108			*
109			* @param array $matches PCRE matches array, with 0 the entire match, and
110			* either index 1, 2 or 3 set with a hex value, dec value,
111			* or string (respectively).
112			* @return string Replacement string.
113			*/
114
115			protected function entityCallback($matches)
116			{
117			$entity = $matches[0];
118			$hex_part = isset($matches[1]) ? $matches[1] : null;
119			$dec_part = isset($matches[2]) ? $matches[2] : null;
120			$named_part = empty($matches[3]) ? (empty($matches[4]) ? "" : $matches[4]) : $matches[3];
121			if ($hex_part !== null && $hex_part !== "") {
122			return HTMLPurifier_Encoder::unichr(hexdec($hex_part));
123			} elseif ($dec_part !== null && $dec_part !== "") {
124			return HTMLPurifier_Encoder::unichr((int)$dec_part);
125			} else {
126			if (!$this->_entity_lookup) {
127			$this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
128			}
129			if (isset($this->_entity_lookup->table[$named_part])) {
130			return $this->_entity_lookup->table[$named_part];
131			} else {
132			// exact match didn't match anything, so test if
133			// any of the semicolon optional match the prefix.
134			// Test that this is an EXACT match is important to
135			// prevent infinite loop
136			if (!empty($matches[3])) {
137			return preg_replace_callback(
138			$this->_semiOptionalPrefixRegex,
139			array($this, 'entityCallback'),
140			$entity
141			);
142			}
143			return $entity;
144			}
145			}
146			}
147
148			// LEGACY CODE BELOW
149
150			/**
151			* Callback regex string for parsing entities.
152			* @type string
153			*/
154			protected $_substituteEntitiesRegex =
155			'/&(?:[#]x([a-fA-F0-9]+)\|[#]0(\d+)\|([A-Za-z_:][A-Za-z0-9.\-_:]));?/';
156			// 1. hex 2. dec 3. string (XML style)
157
158			/**
159			* Decimal to parsed string conversion table for special entities.
160			* @type array
161			*/
162			protected $_special_dec2str =
163			array(
164			34 => '"',
165			38 => '&',
166			39 => "'",
167			60 => '<',
168			62 => '>'
169			);
170
171			/**
172			* Stripped entity names to decimal conversion table for special entities.
173			* @type array
174			*/
175			protected $_special_ent2dec =
176			array(
177			'quot' => 34,
178			'amp' => 38,
179			'lt' => 60,
180			'gt' => 62
181			);
182
183			/**
184			* Substitutes non-special entities with their parsed equivalents. Since
185			* running this whenever you have parsed character is t3h 5uck, we run
186			* it before everything else.
187			*
188			* @param string $string String to have non-special entities parsed.
189			* @return string Parsed string.
190			*/
191			public function substituteNonSpecialEntities($string)
192			{
193			// it will try to detect missing semicolons, but don't rely on it
194			return preg_replace_callback(
195			$this->_substituteEntitiesRegex,
196			array($this, 'nonSpecialEntityCallback'),
197			$string
198			);
199			}
200
201			/**
202			* Callback function for substituteNonSpecialEntities() that does the work.
203			*
204			* @param array $matches PCRE matches array, with 0 the entire match, and
205			* either index 1, 2 or 3 set with a hex value, dec value,
206			* or string (respectively).
207			* @return string Replacement string.
208			*/
209
210			protected function nonSpecialEntityCallback($matches)
211			{
212			// replaces all but big five
213			$entity = $matches[0];
214			$is_num = (@$matches[0][1] === '#');
215			if ($is_num) {
216			$is_hex = (@$entity[2] === 'x');
217			$code = $is_hex ? hexdec($matches[1]) : (int)$matches[2];
218			// abort for special characters
219			if (isset($this->_special_dec2str[$code])) {
220			return $entity;
221			}
222			return HTMLPurifier_Encoder::unichr($code);
223			} else {
224			if (isset($this->_special_ent2dec[$matches[3]])) {
225			return $entity;
226			}
227			if (!$this->_entity_lookup) {
228			$this->_entity_lookup = HTMLPurifier_EntityLookup::instance();
229			}
230			if (isset($this->_entity_lookup->table[$matches[3]])) {
231			return $this->_entity_lookup->table[$matches[3]];
232			} else {
233			return $entity;
234			}
235			}
236			}
237
238			/**
239			* Substitutes only special entities with their parsed equivalents.
240			*
241			* @notice We try to avoid calling this function because otherwise, it
242			* would have to be called a lot (for every parsed section).
243			*
244			* @param string $string String to have non-special entities parsed.
245			* @return string Parsed string.
246			*/
247			public function substituteSpecialEntities($string)
248			{
249			return preg_replace_callback(
250			$this->_substituteEntitiesRegex,
251			array($this, 'specialEntityCallback'),
252			$string
253			);
254			}
255
256			/**
257			* Callback function for substituteSpecialEntities() that does the work.
258			*
259			* This callback has same syntax as nonSpecialEntityCallback().
260			*
261			* @param array $matches PCRE-style matches array, with 0 the entire match, and
262			* either index 1, 2 or 3 set with a hex value, dec value,
263			* or string (respectively).
264			* @return string Replacement string.
265			*/
266			protected function specialEntityCallback($matches)
267			{
268			$entity = $matches[0];
269			$is_num = (@$matches[0][1] === '#');
270			if ($is_num) {
271			$is_hex = (@$entity[2] === 'x');
272			$int = $is_hex ? hexdec($matches[1]) : (int)$matches[2];
273			return isset($this->_special_dec2str[$int]) ?
274			$this->_special_dec2str[$int] :
275			$entity;
276			} else {
277			return isset($this->_special_ent2dec[$matches[3]]) ?
278			$this->_special_dec2str[$this->_special_ent2dec[$matches[3]]] :
279			$entity;
280			}
281			}
282			}
283
284			// vim: et sw=4 sts=4
285

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substituteNonSpecialEntities() A

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