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Laurent LE CORRE
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Apache License
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<?xml version="1.0"?>
<ruleset name="cssjanus">
<rule ref="PSR2">
<exclude name="Generic.WhiteSpace.DisallowTabIndent" />
<exclude name="PSR1.Classes.ClassDeclaration.MissingNamespace" />
<exclude name="PSR1.Classes.ClassDeclaration.MultipleClasses" />
<exclude name="PSR2.Classes.ClassDeclaration.OpenBraceNewLine" />
<exclude name="Squiz.Functions.MultiLineFunctionDeclaration.BraceOnSameLine" />
</rule>
<rule ref="Generic.WhiteSpace.ScopeIndent">
<properties>
<property name="tabIndent" value="true" />
</properties>
</rule>
<file>.</file>
<exclude-pattern>vendor</exclude-pattern>
</ruleset>

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<?php
/**
* PHP port of CSSJanus.
* https://github.com/cssjanus/php-cssjanus
*
* Copyright 2008 Google Inc.
* Copyright 2010 Roan Kattouw
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @file
*/
/**
* This is a PHP port of CSSJanus, a utility that transforms CSS style sheets
* written for LTR to RTL.
*
* Original code: http://code.google.com/p/cssjanus/source/browse/trunk/cssjanus.py
*
* @author Lindsey Simon <elsigh@google.com>
* @author Roan Kattouw
*/
class CSSJanus {
// Patterns defined as null are built dynamically by buildPatterns()
private static $patterns = array(
'tmpToken' => '`TMP`',
'nonAscii' => '[\200-\377]',
'unicode' => '(?:(?:\\[0-9a-f]{1,6})(?:\r\n|\s)?)',
'num' => '(?:[0-9]*\.[0-9]+|[0-9]+)',
'unit' => '(?:em|ex|px|cm|mm|in|pt|pc|deg|rad|grad|ms|s|hz|khz|%)',
'body_selector' => 'body\s*{\s*',
'direction' => 'direction\s*:\s*',
'escape' => null,
'nmstart' => null,
'nmchar' => null,
'ident' => null,
'quantity' => null,
'possibly_negative_quantity' => null,
'color' => null,
'url_special_chars' => '[!#$%&*-~]',
'valid_after_uri_chars' => '[\'\"]?\s*',
'url_chars' => null,
'lookahead_not_open_brace' => null,
'lookahead_not_closing_paren' => null,
'lookahead_for_closing_paren' => null,
'lookahead_not_letter' => '(?![a-zA-Z])',
'lookbehind_not_letter' => '(?<![a-zA-Z])',
'chars_within_selector' => '[^\}]*?',
'noflip_annotation' => '\/\*\!?\s*@noflip\s*\*\/',
'noflip_single' => null,
'noflip_class' => null,
'comment' => '/\/\*[^*]*\*+([^\/*][^*]*\*+)*\//',
'direction_ltr' => null,
'direction_rtl' => null,
'left' => null,
'right' => null,
'left_in_url' => null,
'right_in_url' => null,
'ltr_in_url' => null,
'rtl_in_url' => null,
'cursor_east' => null,
'cursor_west' => null,
'four_notation_quantity' => null,
'four_notation_color' => null,
'border_radius' => null,
'box_shadow' => null,
'text_shadow1' => null,
'text_shadow2' => null,
'bg_horizontal_percentage' => null,
'bg_horizontal_percentage_x' => null,
'suffix' => '(\s*(?:!important\s*)?[;}])'
);
/**
* Build patterns we can't define above because they depend on other patterns.
*/
private static function buildPatterns() {
if (!is_null(self::$patterns['escape'])) {
// Patterns have already been built
return;
}
// @codingStandardsIgnoreStart Generic.Files.LineLength.TooLong
$patterns =& self::$patterns;
$patterns['escape'] = "(?:{$patterns['unicode']}|\\[^\r\n\f0-9a-f])";
$patterns['nmstart'] = "(?:[_a-z]|{$patterns['nonAscii']}|{$patterns['escape']})";
$patterns['nmchar'] = "(?:[_a-z0-9-]|{$patterns['nonAscii']}|{$patterns['escape']})";
$patterns['ident'] = "-?{$patterns['nmstart']}{$patterns['nmchar']}*";
$patterns['quantity'] = "{$patterns['num']}(?:\s*{$patterns['unit']}|{$patterns['ident']})?";
$patterns['possibly_negative_quantity'] = "((?:-?{$patterns['quantity']})|(?:inherit|auto))";
$patterns['color'] = "(#?{$patterns['nmchar']}+|(?:rgba?|hsla?)\([ \d.,%-]+\))";
$patterns['url_chars'] = "(?:{$patterns['url_special_chars']}|{$patterns['nonAscii']}|{$patterns['escape']})*";
$patterns['lookahead_not_open_brace'] = "(?!({$patterns['nmchar']}|\r?\n|\s|#|\:|\.|\,|\+|>|\(|\)|\[|\]|=|\*=|~=|\^=|'[^']*'])*?{)";
$patterns['lookahead_not_closing_paren'] = "(?!{$patterns['url_chars']}?{$patterns['valid_after_uri_chars']}\))";
$patterns['lookahead_for_closing_paren'] = "(?={$patterns['url_chars']}?{$patterns['valid_after_uri_chars']}\))";
$patterns['noflip_single'] = "/({$patterns['noflip_annotation']}{$patterns['lookahead_not_open_brace']}[^;}]+;?)/i";
$patterns['noflip_class'] = "/({$patterns['noflip_annotation']}{$patterns['chars_within_selector']}})/i";
$patterns['direction_ltr'] = "/({$patterns['direction']})ltr/i";
$patterns['direction_rtl'] = "/({$patterns['direction']})rtl/i";
$patterns['left'] = "/{$patterns['lookbehind_not_letter']}(left){$patterns['lookahead_not_letter']}{$patterns['lookahead_not_closing_paren']}{$patterns['lookahead_not_open_brace']}/i";
$patterns['right'] = "/{$patterns['lookbehind_not_letter']}(right){$patterns['lookahead_not_letter']}{$patterns['lookahead_not_closing_paren']}{$patterns['lookahead_not_open_brace']}/i";
$patterns['left_in_url'] = "/{$patterns['lookbehind_not_letter']}(left){$patterns['lookahead_for_closing_paren']}/i";
$patterns['right_in_url'] = "/{$patterns['lookbehind_not_letter']}(right){$patterns['lookahead_for_closing_paren']}/i";
$patterns['ltr_in_url'] = "/{$patterns['lookbehind_not_letter']}(ltr){$patterns['lookahead_for_closing_paren']}/i";
$patterns['rtl_in_url'] = "/{$patterns['lookbehind_not_letter']}(rtl){$patterns['lookahead_for_closing_paren']}/i";
$patterns['cursor_east'] = "/{$patterns['lookbehind_not_letter']}([ns]?)e-resize/";
$patterns['cursor_west'] = "/{$patterns['lookbehind_not_letter']}([ns]?)w-resize/";
$patterns['four_notation_quantity_props'] = "((?:margin|padding|border-width)\s*:\s*)";
$patterns['four_notation_quantity'] = "/{$patterns['four_notation_quantity_props']}{$patterns['possibly_negative_quantity']}(\s+){$patterns['possibly_negative_quantity']}(\s+){$patterns['possibly_negative_quantity']}(\s+){$patterns['possibly_negative_quantity']}{$patterns['suffix']}/i";
$patterns['four_notation_color'] = "/((?:-color|border-style)\s*:\s*){$patterns['color']}(\s+){$patterns['color']}(\s+){$patterns['color']}(\s+){$patterns['color']}{$patterns['suffix']}/i";
// border-radius: <length or percentage>{1,4} [optional: / <length or percentage>{1,4} ]
$patterns['border_radius'] = '/(border-radius\s*:\s*)' . $patterns['possibly_negative_quantity']
. '(?:(?:\s+' . $patterns['possibly_negative_quantity'] . ')(?:\s+' . $patterns['possibly_negative_quantity'] . ')?(?:\s+' . $patterns['possibly_negative_quantity'] . ')?)?'
. '(?:(?:(?:\s*\/\s*)' . $patterns['possibly_negative_quantity'] . ')(?:\s+' . $patterns['possibly_negative_quantity'] . ')?(?:\s+' . $patterns['possibly_negative_quantity'] . ')?(?:\s+' . $patterns['possibly_negative_quantity'] . ')?)?' . $patterns['suffix']
. '/i';
$patterns['box_shadow'] = "/(box-shadow\s*:\s*(?:inset\s*)?){$patterns['possibly_negative_quantity']}/i";
$patterns['text_shadow1'] = "/(text-shadow\s*:\s*){$patterns['possibly_negative_quantity']}(\s*){$patterns['color']}/i";
$patterns['text_shadow2'] = "/(text-shadow\s*:\s*){$patterns['color']}(\s*){$patterns['possibly_negative_quantity']}/i";
$patterns['text_shadow3'] = "/(text-shadow\s*:\s*){$patterns['possibly_negative_quantity']}/i";
$patterns['bg_horizontal_percentage'] = "/(background(?:-position)?\s*:\s*(?:[^:;}\s]+\s+)*?)({$patterns['quantity']})/i";
$patterns['bg_horizontal_percentage_x'] = "/(background-position-x\s*:\s*)(-?{$patterns['num']}%)/i";
$patterns['translate_x'] = "/(transform\s*:[^;]*)(translateX\s*\(\s*){$patterns['possibly_negative_quantity']}(\s*\))/i";
$patterns['translate'] = "/(transform\s*:[^;]*)(translate\s*\(\s*){$patterns['possibly_negative_quantity']}((?:\s*,\s*{$patterns['possibly_negative_quantity']}){0,2}\s*\))/i";
// @codingStandardsIgnoreEnd
}
/**
* Transform an LTR stylesheet to RTL
* @param string $css Stylesheet to transform
* @param array|bool $options Options array or value of transformDirInUrl option (back-compat)
* @param bool $options['transformDirInUrl'] Transform directions in URLs (ltr/rtl). Default: false.
* @param bool $options['transformEdgeInUrl'] Transform edges in URLs (left/right). Default: false.
* @param bool $transformEdgeInUrl [optional] For back-compat
* @return string Transformed stylesheet
*/
public static function transform($css, $options = array(), $transformEdgeInUrl = false) {
if (!is_array($options)) {
$options = array(
'transformDirInUrl' => (bool)$options,
'transformEdgeInUrl' => (bool)$transformEdgeInUrl,
);
}
// Defaults
$options += array(
'transformDirInUrl' => false,
'transformEdgeInUrl' => false,
);
// We wrap tokens in ` , not ~ like the original implementation does.
// This was done because ` is not a legal character in CSS and can only
// occur in URLs, where we escape it to %60 before inserting our tokens.
$css = str_replace('`', '%60', $css);
self::buildPatterns();
// Tokenize single line rules with /* @noflip */
$noFlipSingle = new CSSJanusTokenizer(self::$patterns['noflip_single'], '`NOFLIP_SINGLE`');
$css = $noFlipSingle->tokenize($css);
// Tokenize class rules with /* @noflip */
$noFlipClass = new CSSJanusTokenizer(self::$patterns['noflip_class'], '`NOFLIP_CLASS`');
$css = $noFlipClass->tokenize($css);
// Tokenize comments
$comments = new CSSJanusTokenizer(self::$patterns['comment'], '`C`');
$css = $comments->tokenize($css);
// LTR->RTL fixes start here
$css = self::fixDirection($css);
if ($options['transformDirInUrl']) {
$css = self::fixLtrRtlInURL($css);
}
if ($options['transformEdgeInUrl']) {
$css = self::fixLeftRightInURL($css);
}
$css = self::fixLeftAndRight($css);
$css = self::fixCursorProperties($css);
$css = self::fixFourPartNotation($css);
$css = self::fixBorderRadius($css);
$css = self::fixBackgroundPosition($css);
$css = self::fixShadows($css);
$css = self::fixTranslate($css);
// Detokenize stuff we tokenized before
$css = $comments->detokenize($css);
$css = $noFlipClass->detokenize($css);
$css = $noFlipSingle->detokenize($css);
return $css;
}
/**
* Replace direction: ltr; with direction: rtl; and vice versa.
*
* The original implementation only does this inside body selectors
* and misses "body\n{\ndirection:ltr;\n}". This function does not have
* these problems.
*
* See https://code.google.com/p/cssjanus/issues/detail?id=15
*
* @param $css string
* @return string
*/
private static function fixDirection($css) {
$css = preg_replace(
self::$patterns['direction_ltr'],
'$1' . self::$patterns['tmpToken'],
$css
);
$css = preg_replace(self::$patterns['direction_rtl'], '$1ltr', $css);
$css = str_replace(self::$patterns['tmpToken'], 'rtl', $css);
return $css;
}
/**
* Replace 'ltr' with 'rtl' and vice versa in background URLs
* @param $css string
* @return string
*/
private static function fixLtrRtlInURL($css) {
$css = preg_replace(self::$patterns['ltr_in_url'], self::$patterns['tmpToken'], $css);
$css = preg_replace(self::$patterns['rtl_in_url'], 'ltr', $css);
$css = str_replace(self::$patterns['tmpToken'], 'rtl', $css);
return $css;
}
/**
* Replace 'left' with 'right' and vice versa in background URLs
* @param $css string
* @return string
*/
private static function fixLeftRightInURL($css) {
$css = preg_replace(self::$patterns['left_in_url'], self::$patterns['tmpToken'], $css);
$css = preg_replace(self::$patterns['right_in_url'], 'left', $css);
$css = str_replace(self::$patterns['tmpToken'], 'right', $css);
return $css;
}
/**
* Flip rules like left: , padding-right: , etc.
* @param $css string
* @return string
*/
private static function fixLeftAndRight($css) {
if (extension_loaded('mbstring')) {
mb_internal_encoding("UTF-8");
mb_regex_encoding("UTF-8");
$css = mb_eregi_replace(
trim(rtrim(self::$patterns['left'], 'i'), '/'),
self::$patterns['tmpToken'],
$css
);
$css = mb_eregi_replace(
trim(rtrim(self::$patterns['right'], 'i'), '/'),
'left',
$css
);
} else {
$css = preg_replace(self::$patterns['left'], self::$patterns['tmpToken'], $css);
$css = preg_replace(self::$patterns['right'], 'left', $css);
}
$css = str_replace(self::$patterns['tmpToken'], 'right', $css);
return $css;
}
/**
* Flip East and West in rules like cursor: nw-resize;
* @param $css string
* @return string
*/
private static function fixCursorProperties($css) {
$css = preg_replace(
self::$patterns['cursor_east'],
'$1' . self::$patterns['tmpToken'],
$css
);
$css = preg_replace(self::$patterns['cursor_west'], '$1e-resize', $css);
$css = str_replace(self::$patterns['tmpToken'], 'w-resize', $css);
return $css;
}
/**
* Swap the second and fourth parts in four-part notation rules like
* padding: 1px 2px 3px 4px;
*
* Unlike the original implementation, this function doesn't suffer from
* the bug where whitespace is not preserved when flipping four-part rules
* and four-part color rules with multiple whitespace characters between
* colors are not recognized.
* See https://code.google.com/p/cssjanus/issues/detail?id=16
* @param $css string
* @return string
*/
private static function fixFourPartNotation($css) {
$css = preg_replace(self::$patterns['four_notation_quantity'], '$1$2$3$8$5$6$7$4$9', $css);
$css = preg_replace(self::$patterns['four_notation_color'], '$1$2$3$8$5$6$7$4$9', $css);
return $css;
}
/**
* Swaps appropriate corners in border-radius values.
*
* @param $css string
* @return string
*/
private static function fixBorderRadius($css) {
return preg_replace_callback(
self::$patterns['border_radius'],
array('self', 'calculateBorderRadius'),
$css
);
}
/**
* Callback for fixBorderRadius()
* @param $matches array
* @return string
*/
private static function calculateBorderRadius($matches) {
$pre = $matches[1];
$firstGroup = array_filter(array_slice($matches, 2, 4), function ($match) {
return $match !== '';
});
$secondGroup = array_filter(array_slice($matches, 6, 4), function ($match) {
return $match !== '';
});
$post = $matches[10] ?: '';
if ($secondGroup) {
$values = self::flipBorderRadiusValues($firstGroup)
. ' / ' . self::flipBorderRadiusValues($secondGroup);
} else {
$values = self::flipBorderRadiusValues($firstGroup);
}
return $pre . $values . $post;
}
/**
* Callback for fixBorderRadius()
* @param array $values Matched values
* @return string Flipped values
*/
private static function flipBorderRadiusValues($values) {
switch (count($values)) {
case 4:
$values = array($values[1], $values[0], $values[3], $values[2]);
break;
case 3:
$values = array($values[1], $values[0], $values[1], $values[2]);
break;
case 2:
$values = array($values[1], $values[0]);
break;
case 1:
$values = array($values[0]);
break;
}
return implode(' ', $values);
}
/**
* Flips the sign of a CSS value, possibly with a unit.
*
* We can't just negate the value with unary minus due to the units.
*
* @param $cssValue string
* @return string
*/
private static function flipSign($cssValue) {
// Don't mangle zeroes
if (floatval($cssValue) === 0.0) {
return $cssValue;
} elseif ($cssValue[0] === '-') {
return substr($cssValue, 1);
} else {
return "-" . $cssValue;
}
}
/**
* Negates horizontal offset in box-shadow and text-shadow rules.
*
* @param $css string
* @return string
*/
private static function fixShadows($css) {
$css = preg_replace_callback(self::$patterns['box_shadow'], function ($matches) {
return $matches[1] . self::flipSign($matches[2]);
}, $css);
$css = preg_replace_callback(self::$patterns['text_shadow1'], function ($matches) {
return $matches[1] . $matches[2] . $matches[3] . self::flipSign($matches[4]);
}, $css);
$css = preg_replace_callback(self::$patterns['text_shadow2'], function ($matches) {
return $matches[1] . $matches[2] . $matches[3] . self::flipSign($matches[4]);
}, $css);
$css = preg_replace_callback(self::$patterns['text_shadow3'], function ($matches) {
return $matches[1] . self::flipSign($matches[2]);
}, $css);
return $css;
}
/**
* Negates horizontal offset in tranform: translate()
*
* @param $css string
* @return string
*/
private static function fixTranslate($css) {
$css = preg_replace_callback(self::$patterns['translate'], function ($matches) {
return $matches[1] . $matches[2] . self::flipSign($matches[3]) . $matches[4];
}, $css);
$css = preg_replace_callback(self::$patterns['translate_x'], function ($matches) {
return $matches[1] . $matches[2] . self::flipSign($matches[3]) . $matches[4];
}, $css);
return $css;
}
/**
* Flip horizontal background percentages.
* @param $css string
* @return string
*/
private static function fixBackgroundPosition($css) {
$replaced = preg_replace_callback(
self::$patterns['bg_horizontal_percentage'],
array('self', 'calculateNewBackgroundPosition'),
$css
);
if ($replaced !== null) {
// preg_replace_callback() sometimes returns null
$css = $replaced;
}
$replaced = preg_replace_callback(
self::$patterns['bg_horizontal_percentage_x'],
array('self', 'calculateNewBackgroundPosition'),
$css
);
if ($replaced !== null) {
$css = $replaced;
}
return $css;
}
/**
* Callback for fixBackgroundPosition()
* @param $matches array
* @return string
*/
private static function calculateNewBackgroundPosition($matches) {
$value = $matches[2];
if (substr($value, -1) === '%') {
$idx = strpos($value, '.');
if ($idx !== false) {
$len = strlen($value) - $idx - 2;
$value = number_format(100 - (float)$value, $len) . '%';
} else {
$value = (100 - (float)$value) . '%';
}
}
return $matches[1] . $value;
}
}
/**
* Utility class used by CSSJanus that tokenizes and untokenizes things we want
* to protect from being janused.
* @author Roan Kattouw
*/
class CSSJanusTokenizer {
private $regex;
private $token;
private $originals;
/**
* Constructor
* @param string $regex Regular expression whose matches to replace by a token.
* @param string $token Token
*/
public function __construct($regex, $token) {
$this->regex = $regex;
$this->token = $token;
$this->originals = array();
}
/**
* Replace all occurrences of $regex in $str with a token and remember
* the original strings.
* @param string $str to tokenize
* @return string Tokenized string
*/
public function tokenize($str) {
return preg_replace_callback($this->regex, array($this, 'tokenizeCallback'), $str);
}
/**
* @param $matches array
* @return string
*/
private function tokenizeCallback($matches) {
$this->originals[] = $matches[0];
return $this->token;
}
/**
* Replace tokens with their originals. If multiple strings were tokenized, it's important they be
* detokenized in exactly the SAME ORDER.
* @param string $str previously run through tokenize()
* @return string Original string
*/
public function detokenize($str) {
// PHP has no function to replace only the first occurrence or to
// replace occurrences of the same string with different values,
// so we use preg_replace_callback() even though we don't really need a regex
return preg_replace_callback(
'/' . preg_quote($this->token, '/') . '/',
array($this, 'detokenizeCallback'),
$str
);
}
/**
* @param $matches
* @return mixed
*/
private function detokenizeCallback($matches) {
$retval = current($this->originals);
next($this->originals);
return $retval;
}
}