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<?php /** * Math rendering functions. * * @package MathJaxLatex / /* * The contents of this file are subject to the LGPL License, Version 3.0. * * Copyright (C) 2010-2013, Phillip Lord, Newcastle University * Copyright (C) 2010-2011, Simon Cockell, Newcastle University * * This program is free software: you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License * for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see http://www.gnu.org/licenses/. / /* * Math rendering class. / class MathJax_Latex { /* * Add the MathJax script to the page. * * @var boolean / public static $add_script; /* * Block the MathJax script on the page. * * @var boolean / public static $block_script; /* * Allow MathML tags (for use with KSES). * * @var boolean / public static $mathml_tags = [ 'math' => [ 'class', 'id', 'style', 'dir', 'href', 'mathbackground', 'mathcolor', 'display', 'overflow', 'xmlns' ], 'maction' => [ 'actiontype', 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor', 'selection' ], 'maligngroup' => [], 'malignmark' => [], 'menclose' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor', 'notation' ], 'merror' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor' ], 'mfenced' => [ 'class', 'id', 'style', 'close', 'href', 'mathbackground', 'mathcolor', 'open', 'separators' ], 'mfrac' => [ 'bevelled', 'class', 'id', 'style', 'denomalign', 'href', 'linethickness', 'mathbackground', 'mathcolor', 'numalign' ], 'mglyph' => [ 'alt', 'class', 'id', 'style', 'height', 'href', 'mathbackground', 'src', 'valign', 'width' ], 'mi' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant' ], 'mlabeledtr' => [ 'class', 'id', 'style', 'columnalign', 'groupalign', 'href', 'mathbackground', 'mathcolor', 'rowalign' ], 'mlongdiv' => [], 'mmultiscripts' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor', 'subscriptshift', 'superscriptshift' ], 'mn' => [ 'class', 'id', 'style', 'dir', 'href', 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant' ], 'mo' => [ 'accent', 'class', 'id', 'style', 'dir', 'fence', 'form', 'href', 'largeop', 'lspace', 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant', 'maxsize', 'minsize', 'moveablelimits', 'rspace', 'separator', 'stretchy', 'symmetric' ], 'mover' => [ 'accent', 'align', 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor' ], 'mpadded' => [ 'class', 'id', 'style', 'depth', 'height', 'href', 'lspace', 'mathbackground', 'mathcolor', 'voffset', 'width' ], 'mphantom' => [ 'class', 'id', 'style', 'mathbackground' ], 'mroot' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor' ], 'mrow' => [ 'class', 'id', 'style', 'dir', 'href', 'mathbackground', 'mathcolor' ], 'ms' => [ 'class', 'id', 'style', 'dir', 'lquote', 'href', 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant', 'rquote' ], 'mscarries' => [], 'mscarry' => [], 'msgroup' => [], 'msline' => [], 'mspace' => [ 'class', 'id', 'style', 'depth', 'height', 'linebreak', 'mathbackground', 'width' ], 'msqrt' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor' ], 'msrow' => [], 'mstack' => [], 'mstyle' => [ 'dir', 'decimalpoint', 'displaystyle', 'infixlinebreakstyle', 'scriptlevel', 'scriptminsize', 'scriptsizemultiplier' ], 'msub' => [ 'class', 'id', 'style', 'mathbackground', 'mathcolor', 'subscriptshift' ], 'msubsup' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor', 'subscriptshift', 'superscriptshift' ], 'msup' => [ 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor', 'superscriptshift' ], 'mtable' => [ 'class', 'id', 'style', 'align', 'alignmentscope', 'columnalign', 'columnlines', 'columnspacing', 'columnwidth', 'displaystyle', 'equalcolumns', 'equalrows', 'frame', 'framespacing', 'groupalign', 'href', 'mathbackground', 'mathcolor', 'minlabelspacing', 'rowalign', 'rowlines', 'rowspacing', 'side', 'width' ], 'mtd' => [ 'class', 'id', 'style', 'columnalign', 'columnspan', 'groupalign', 'href', 'mathbackground', 'mathcolor', 'rowalign', 'rowspan' ], 'mtext' => [ 'class', 'id', 'style', 'dir', 'href', 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant' ], 'mtr' => [ 'class', 'id', 'style', 'columnalign', 'groupalign', 'href', 'mathbackground', 'mathcolor', 'rowalign' ], 'munder' => [ 'accentunder', 'align', 'class', 'id', 'style', 'mathbackground', 'mathcolor' ], 'munderover' => [ 'accent', 'accentunder', 'align', 'class', 'id', 'style', 'href', 'mathbackground', 'mathcolor' ], 'semantics' => [ 'definitionURL', 'encoding', 'cd', 'name', 'src' ], 'annotation' => [ 'definitionURL', 'encoding', 'cd', 'name', 'src' ], 'annotation-xml' => [ 'definitionURL', 'encoding', 'cd', 'name', 'src' ], ]; /* * Register actions and filters. / public static function init() { register_activation_hook( __FILE__, [ __CLASS__, 'mathjax_install' ] ); register_deactivation_hook( __FILE__, [ __CLASS__, 'mathjax_uninstall' ] ); if ( get_option( 'kblog_mathjax_force_load' ) ) { self::$add_script = true; } add_shortcode( 'mathjax', [ __CLASS__, 'mathjax_shortcode' ] ); add_shortcode( 'nomathjax', [ __CLASS__, 'nomathjax_shortcode' ] ); add_shortcode( 'latex', [ __CLASS__, 'latex_shortcode' ] ); add_action( 'wp_footer', [ __CLASS__, 'add_script' ] ); add_filter( 'script_loader_tag', [ __CLASS__, 'script_loader_tag' ], 10, 3 ); if ( get_option( 'kblog_mathjax_use_wplatex_syntax' ) ) { add_filter( 'the_content', [ __CLASS__, 'inline_to_shortcode' ] ); } add_filter( 'plugin_action_links', [ __CLASS__, 'mathjax_settings_link' ], 9, 2 ); add_filter( 'the_content', [ __CLASS__, 'filter_br_tags_on_math' ] ); add_action( 'init', [ __CLASS__, 'allow_mathml_tags' ] ); add_filter( 'tiny_mce_before_init', [ __CLASS__, 'allow_mathml_tags_in_tinymce' ] ); } /* * Registers default options. / public static function mathjax_install() { add_option( 'kblog_mathjax_force_load', false ); add_option( 'kblog_mathjax_latex_inline', 'inline' ); add_option( 'kblog_mathjax_use_wplatex_syntax', false ); add_option( 'kblog_mathjax_use_cdn', true ); add_option( 'kblog_mathjax_custom_location', false ); add_option( 'kblog_mathjax_config', 'default' ); } /* * Removes default options. / public static function mathjax_uninstall() { delete_option( 'kblog_mathjax_force_load' ); delete_option( 'kblog_mathjax_latex_inline' ); delete_option( 'kblog_mathjax_use_wplatex_syntax' ); delete_option( 'kblog_mathjax_use_cdn' ); delete_option( 'kblog_mathjax_custom_location' ); delete_option( 'kblog_mathjax_config' ); } /* * Set flag to load [mathjax] shortcode. * * @param array $atts Shortcode attributes. * @param string $content Shortcode content. / public static function mathjax_shortcode( $atts, $content ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed self::$add_script = true; } /* * Set flag to load [nomathjax] shortcode. * * @param array $atts Shortcode attributes. * @param string $content Shortcode content. / public static function nomathjax_shortcode( $atts, $content ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed self::$block_script = true; } /* * Enable [latex] shortcode. * * @param array $atts Shortcode attributes. * @param string $content Shortcode content. / public static function latex_shortcode( $atts, $content ) { self::$add_script = true; // This gives us an optional "syntax" attribute, which defaults to "inline", but can also be "display". $shortcode_atts = shortcode_atts( [ 'syntax' => get_option( 'kblog_mathjax_latex_inline' ), ], $atts ); if ( 'inline' === $shortcode_atts['syntax'] ) { return '$' . $content . '$'; } elseif ( 'display' === $shortcode_atts['syntax'] ) { return '\[' . $content . '\]'; } } /* * Enqueue/add the JavaScript to the <head> tag. / public static function add_script() { if ( ! self::$add_script ) { return; } if ( self::$block_script ) { return; } // Initialise option for existing MathJax-LaTeX users. if ( get_option( 'kblog_mathjax_use_cdn' ) \|\| ! get_option( 'kblog_mathjax_custom_location' ) ) { $mathjax_location = 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/' . MATHJAX_JS_VERSION . '/MathJax.js'; } else { $mathjax_location = get_option( 'kblog_mathjax_custom_location' ); } $config = get_option( 'kblog_mathjax_config' ); if ( ! $config ) { $config = 'default'; } $mathjax_url = add_query_arg( 'config', $config, $mathjax_location ); wp_enqueue_script( 'mathjax', $mathjax_url, false, MATHJAX_PLUGIN_VERSION, false ); $mathjax_config = apply_filters( 'mathjax_config', [] ); if ( $mathjax_config ) { wp_add_inline_script( 'mathjax', 'MathJax.Hub.Config(' . wp_json_encode( $mathjax_config ) . ');' ); } } /* * Set the script tag to have type text/x-mathjax-config * * @param string $tag The `<script>` tag for the enqueued script. * @param string $handle The script's registered handle. * @param string $src The script's source URL. * * @return string $tag / public static function script_loader_tag( $tag, $handle = null, $src = null ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed if ( 'mathjax' === $handle ) { // Replace the <script> tag for the inline script, but not for the <script> tag with src="". return str_replace( "<script type='text/javascript'>", "<script type='text/x-mathjax-config'>", $tag ); } return $tag; } /* * Content filter that replaces inline $latex with [latex] shortcode. * * @param string $content The page content. / public static function inline_to_shortcode( $content ) { if ( false === strpos( $content, '$latex' ) ) { return $content; } self::$add_script = true; return preg_replace_callback( '#\$latex[= ](.?[^\\\\])\$#', [ __CLASS__, 'inline_to_shortcode_callback' ], $content ); } /** * Callback for inline_to_shortcode() regex. * * Also support wp-latex syntax. This includes the ability to set background and foreground * colour, which we can ignore. * * @param array $matches Regular expression matches. / public static function inline_to_shortcode_callback( $matches ) { if ( preg_match( '/.+((?:&\|&)s=(-?[0-4]))./i', $matches[1], $s_matches ) ) { $matches[1] = str_replace( $s_matches[1], '', $matches[1] ); } if ( preg_match( '/.+((?:&\|&)fg=([0-9a-f]{6}))./i', $matches[1], $fg_matches ) ) { $matches[1] = str_replace( $fg_matches[1], '', $matches[1] ); } if ( preg_match( '/.+((?:&\|&)bg=([0-9a-f]{6}))./i', $matches[1], $bg_matches ) ) { $matches[1] = str_replace( $bg_matches[1], '', $matches[1] ); } return "[latex]{$matches[1]}[/latex]"; } /** * Add a link to settings on the plugin management page. * * @param string[] $actions An array of plugin action links. By default this can include 'activate', * 'deactivate', and 'delete'. With Multisite active this can also include * 'network_active' and 'network_only' items. * @param string $plugin_file Path to the plugin file relative to the plugins directory. / public static function mathjax_settings_link( $actions, $plugin_file ) { if ( 'mathjax-latex/mathjax-latex.php' === $plugin_file && function_exists( 'admin_url' ) ) { $settings_link = '<a href="' . esc_url( admin_url( 'options-general.php?page=kblog-mathjax-latex' ) ) . '">' . esc_html__( 'Settings' ) . '</a>'; array_unshift( $actions, $settings_link ); } return $actions; } /* * Removes the <br /> tags inside math tags. * * @param string $content The page content. * * @return string without <br /> tags / public static function filter_br_tags_on_math( $content ) { $filtered_content = preg_replace_callback( '/(<math.>.<\/math>)/isU', function ( $matches ) { return str_replace( [ '<br/>', '<br />', '<br>' ], '', $matches[0] ); }, $content ); return null === $filtered_content ? $content : $filtered_content; } /* * Allow MathML tags within WordPress * http://vip.wordpress.com/documentation/register-additional-html-attributes-for-tinymce-and-wp-kses/ * https://developer.mozilla.org/en-US/docs/Web/MathML/Element / public static function allow_mathml_tags() { global $allowedposttags; foreach ( self::$mathml_tags as $tag => $attributes ) { $allowedposttags[ $tag ] = []; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited foreach ( $attributes as $a ) { $allowedposttags[ $tag ][ $a ] = true; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited } } } /* * Ensure that the MathML tags will not be removed * by the TinyMCE editor * * @param array $options Array of TinyMCE options. * * @return array of TinyMCE options. */ public static function allow_mathml_tags_in_tinymce( $options ) { $extended_tags = []; foreach ( self::$mathml_tags as $tag => $attributes ) { if ( ! empty( $attributes ) ) { $tag = $tag . '[' . implode( '\|', $attributes ) . ']'; } $extended_tags[] = $tag; } if ( ! isset( $options['extended_valid_elements'] ) ) { $options['extended_valid_elements'] = ''; } $options['extended_valid_elements'] .= ',' . implode( ',', $extended_tags ); $options['extended_valid_elements'] = trim( $options['extended_valid_elements'], ',' ); return $options; } } MathJax_Latex::init();

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