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Diffstat (limited to 'vendor/cssjanus/cssjanus/src/CSSJanus.php')
| -rw-r--r-- | vendor/cssjanus/cssjanus/src/CSSJanus.php | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/vendor/cssjanus/cssjanus/src/CSSJanus.php b/vendor/cssjanus/cssjanus/src/CSSJanus.php new file mode 100644 index 00000000..d81aa2bb --- /dev/null +++ b/vendor/cssjanus/cssjanus/src/CSSJanus.php @@ -0,0 +1,454 @@ +<?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, + ); + + /** + * 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']}(\s*(?:!important\s*)?[;}])/i"; + $patterns['four_notation_color'] = "/((?:-color|border-style)\s*:\s*){$patterns['color']}(\s+){$patterns['color']}(\s+){$patterns['color']}(\s+){$patterns['color']}(\s*(?:!important\s*)?[;}])/i"; + $patterns['border_radius'] = "/(border-radius\s*:\s*)([^;}]*)/"; + $patterns['box_shadow'] = "/(box-shadow\s*:\s*(?:inset\s*)?){$patterns['possibly_negative_quantity']}/i"; + $patterns['text_shadow1'] = "/(text-shadow\s*:\s*){$patterns['color']}(\s*){$patterns['possibly_negative_quantity']}/i"; + $patterns['text_shadow2'] = "/(text-shadow\s*:\s*){$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"; + // @codingStandardsIgnoreEnd + + } + + /** + * Transform an LTR stylesheet to RTL + * @param string $css stylesheet to transform + * @param $swapLtrRtlInURL Boolean: If true, swap 'ltr' and 'rtl' in URLs + * @param $swapLeftRightInURL Boolean: If true, swap 'left' and 'right' in URLs + * @return string Transformed stylesheet + */ + public static function transform($css, $swapLtrRtlInURL = false, $swapLeftRightInURL = 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 ($swapLtrRtlInURL) { + $css = self::fixLtrRtlInURL($css); + } + + if ($swapLeftRightInURL) { + $css = self::fixLeftRightInURL($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); + + // 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) { + $css = preg_replace_callback(self::$patterns['border_radius'], function ($matches) { + $pre = $matches[1]; + $values = $matches[2]; + $numValues = count(preg_split('/\s+/', trim($values))); + switch ($numValues) { + case 4: + $values = preg_replace('/^(\S+)(\s*)(\S+)(\s*)(\S+)(\s*)(\S+)/', '$3$2$1$4$7$6$5', $values); + break; + case 3: + case 2: + $values = preg_replace('/^(\S+)(\s*)(\S+)/', '$3$2$1', $values); + break; + } + return $pre . $values; + }, $css); + + return $css; + } + + /** + * Negates horizontal offset in box-shadow and text-shadow rules. + * + * @param $css string + * @return string + */ + private static function fixShadows($css) { + // 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.) + $flipSign = function ($cssValue) { + // Don't mangle zeroes + if (floatval($cssValue) === 0.0) { + return $cssValue; + } elseif ($cssValue[0] === '-') { + return substr($cssValue, 1); + } else { + return "-" . $cssValue; + } + }; + + $css = preg_replace_callback(self::$patterns['box_shadow'], function ($matches) use ($flipSign) { + return $matches[1] . $flipSign($matches[2]); + }, $css); + + $css = preg_replace_callback(self::$patterns['text_shadow1'], function ($matches) use ($flipSign) { + return $matches[1] . $matches[2] . $matches[3] . $flipSign($matches[4]); + }, $css); + + $css = preg_replace_callback(self::$patterns['text_shadow2'], function ($matches) use ($flipSign) { + return $matches[1] . $flipSign($matches[2]); + }, $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 - $value, $len) . '%'; + } else { + $value = (100 - $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; + } +} |