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<?php |
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/** |
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* This file is part of PHP-Typography. |
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* |
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* Copyright 2014-2018 Peter Putzer. |
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* Copyright 2009-2011 KINGdesk, LLC. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* |
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* *** |
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* |
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* @package mundschenk-at/php-typography |
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* @license http://www.gnu.org/licenses/gpl-2.0.html |
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*/ |
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namespace PHP_Typography; |
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/** |
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* Common regular expression components. |
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* |
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* @since 5.0.0 |
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*/ |
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abstract class RE { |
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/** |
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* Find the HTML character representation for the following characters: |
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* tab | line feed | carriage return | space | non-breaking space | ethiopic wordspace |
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* ogham space mark | en quad space | em quad space | en-space | three-per-em space |
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* four-per-em space | six-per-em space | figure space | punctuation space | em-space |
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* thin space | hair space | narrow no-break space |
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* medium mathematical space | ideographic space |
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* Some characters are used inside words, we will not count these as a space for the purpose |
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* of finding word boundaries: |
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* zero-width-space ("​", "​") |
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* zero-width-joiner ("‌", "‌", "‍") |
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* zero-width-non-joiner ("‍", "‍", "‌") |
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*/ |
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const HTML_SPACES = ' |
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\x{00a0} # no-break space |
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\x{1361} # ethiopic wordspace |
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\x{2000} # en quad-space |
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\x{2001} # em quad-space |
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\x{2002} # en space |
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\x{2003} # em space |
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\x{2004} # three-per-em space |
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\x{2005} # four-per-em space |
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\x{2006} # six-per-em space |
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\x{2007} # figure space |
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\x{2008} # punctuation space |
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\x{2009} # thin space |
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\x{200a} # hair space |
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\x{200b} # zero-width space |
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\x{200c} # zero-width joiner |
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\x{200d} # zero-width non-joiner |
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\x{202f} # narrow no-break space |
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\x{205f} # medium mathematical space |
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\x{3000} # ideographic space |
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'; // required modifiers: x (multiline pattern) i (case insensitive) u (utf8). |
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const NORMAL_SPACES = ' \f\n\r\t\v'; // equivalent to \s in non-Unicode mode. |
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// Marker for strings that should not be replaced. |
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const ESCAPE_MARKER = '_E_S_C_A_P_E_D_'; |
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// Inserted HTML tags. |
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const ESCAPED_HTML_OPEN = '_B_E_G_I_N_H_T_M_L_'; |
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const ESCAPED_HTML_CLOSE = '_E_N_D_H_T_M_L_'; |
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/** |
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* A pattern matching top-level domains. |
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* |
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* @var string |
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*/ |
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private static $top_level_domains_pattern; |
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/** |
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* Load a list of top-level domains from a file. |
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* |
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* @param string $path The full path and filename. |
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* |
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* @return string A list of top-level domains concatenated with '|'. |
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*/ |
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private static function get_top_level_domains_from_file( $path ) { |
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$domains = []; |
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if ( \file_exists( $path ) ) { |
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$file = new \SplFileObject( $path ); |
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while ( ! $file->eof() ) { |
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$line = $file->fgets(); |
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if ( \preg_match( '#^[a-zA-Z0-9][a-zA-Z0-9-]*$#', $line, $matches ) ) { |
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$domains[] = \strtolower( $matches[0] ); |
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} |
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} |
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} |
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if ( \count( $domains ) > 0 ) { |
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return \implode( '|', $domains ); |
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} else { |
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return 'ac|ad|aero|ae|af|ag|ai|al|am|an|ao|aq|arpa|ar|asia|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|biz|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|cat|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|com|coop|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|info|int|in|io|iq|ir|is|it|je|jm|jobs|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mil|mk|ml|mm|mn|mobi|mo|mp|mq|mr|ms|mt|museum|mu|mv|mw|mx|my|mz|name|na|nc|net|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pro|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tel|tf|tg|th|tj|tk|tl|tm|tn|to|tp|travel|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw'; |
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} |
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} |
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/** |
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* Retrieves a pattern matching all valid top-level domains. |
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* |
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* @return string |
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*/ |
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public static function top_level_domains() { |
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if ( empty( self::$top_level_domains_pattern ) ) { |
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// Initialize valid top level domains from IANA list. |
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self::$top_level_domains_pattern = self::get_top_level_domains_from_file( __DIR__ . '/IANA/tlds-alpha-by-domain.txt' ); |
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} |
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return self::$top_level_domains_pattern; |
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} |
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/** |
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* Replace < and > with escape markers. |
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* |
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* @param string $tags A string containing HTML markup (all other < and > must be entity encoded). |
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* |
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* @return string |
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*/ |
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public static function escape_tags( $tags ) { |
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return str_replace( [ '<', '>' ], [ self::ESCAPED_HTML_OPEN, self::ESCAPED_HTML_CLOSE ], $tags ); |
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} |
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/** |
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* Replace tag escape markers with < and >. |
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* |
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* @param string $tags A string containing escaped HTML markup. |
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* |
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* @return string |
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*/ |
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public static function unescape_tags( $tags ) { |
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return str_replace( [ self::ESCAPED_HTML_OPEN, self::ESCAPED_HTML_CLOSE ], [ '<', '>' ], $tags ); |
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} |
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} |
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mundschenk-at /
php-typography
