--- /dev/null
+<?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) {
+ $css = preg_replace(self::$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;
+ }
+}
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