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<?php |
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/** |
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* LaTeX shortcode. |
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* Originally shipped as its own module, under modules/latex.php, and named "Beautiful Math". |
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* |
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* Backward compatibility requires support for both "[latex][/latex]", and |
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* "$latex $" shortcodes. |
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* |
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* $latex e^{\i \pi} + 1 = 0$ -> [latex]e^{\i \pi} + 1 = 0[/latex] |
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* $latex [a, b]$ -> [latex][a, b][/latex] |
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* [latex s=4 bg=00f fg=ff0]\LaTeX[/latex] |
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* |
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* @package Jetpack |
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*/ |
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/** |
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* Replace LaTeX markup in post content. |
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* This covers the use of the "$latex $" format. |
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* |
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* @param string $content Post content. |
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*/ |
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function latex_markup( $content ) { |
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$textarr = wp_html_split( $content ); |
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$regex = '% |
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\$latex(?:=\s*|\s+) |
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((?: |
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[^$]+ # Not a dollar |
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(?<=(?<!\\\\)\\\\)\$ # Dollar preceded by exactly one slash |
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)+) |
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(?<!\\\\)\$ # Dollar preceded by zero slashes |
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%ix'; |
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foreach ( $textarr as &$element ) { |
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if ( '' === $element || '<' === $element[0] ) { |
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continue; |
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} |
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if ( false === stripos( $element, '$latex' ) ) { |
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continue; |
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} |
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$element = preg_replace_callback( $regex, 'latex_src', $element ); |
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} |
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return implode( '', $textarr ); |
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} |
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/** |
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* Extract LaTex parameters to be used in LaTeX image. |
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* |
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* @param array $matches Array of matches found when parsing post content. |
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*/ |
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function latex_src( $matches ) { |
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$latex = $matches[1]; |
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$bg = latex_get_default_color( 'bg' ); |
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$fg = latex_get_default_color( 'text', '000' ); |
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$s = 0; |
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$latex = latex_entity_decode( $latex ); |
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View Code Duplication |
if ( preg_match( '/.+(&fg=[0-9a-f]{6}).*/i', $latex, $fg_matches ) ) { |
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$fg = substr( $fg_matches[1], 4 ); |
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$latex = str_replace( $fg_matches[1], '', $latex ); |
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} |
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View Code Duplication |
if ( preg_match( '/.+(&bg=[0-9a-f]{6}).*/i', $latex, $bg_matches ) ) { |
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$bg = substr( $bg_matches[1], 4 ); |
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$latex = str_replace( $bg_matches[1], '', $latex ); |
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} |
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View Code Duplication |
if ( preg_match( '/.+(&s=[0-9-]{1,2}).*/i', $latex, $s_matches ) ) { |
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$s = (int) substr( $s_matches[1], 3 ); |
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$latex = str_replace( $s_matches[1], '', $latex ); |
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} |
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return latex_render( $latex, $fg, $bg, $s ); |
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} |
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/** |
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* Get a default color to use for the background and the foreground of LaTeX formulae. |
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* Default color can be provided by themes on WordPress.com. |
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* |
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* @param string $color Name of the color to get (e.g. 'text' for text color, 'bg' for background color). |
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* @param string $default_color Default color if no color is specified. |
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*/ |
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function latex_get_default_color( $color, $default_color = 'ffffff' ) { |
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global $themecolors; |
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return isset( $themecolors[ $color ] ) ? $themecolors[ $color ] : $default_color; |
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} |
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/** |
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* Clean up LaTex formula before it's sent to WordPress for the creation of a LaTex formula image. |
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* |
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* @param string $latex LaTeX formula. |
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*/ |
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function latex_entity_decode( $latex ) { |
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return str_replace( |
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array( |
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'<', |
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'>', |
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'"', |
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''', |
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'&', |
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'&', |
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"\n", |
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"\r", |
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), |
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array( '<', '>', '"', "'", '&', '&', ' ', ' ' ), |
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$latex |
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); |
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} |
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/** |
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* Render image of the LaTeX formula. |
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* |
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* @param string $latex LaTeX formula. |
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* @param string $fg Foreground color. |
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* @param string $bg Background color. |
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* @param int $s Formula size. |
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*/ |
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function latex_render( $latex, $fg, $bg, $s = 0 ) { |
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$url = add_query_arg( |
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array( |
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'latex' => rawurlencode( $latex ), |
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'bg' => sanitize_hex_color_no_hash( $bg ), |
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'fg' => sanitize_hex_color_no_hash( $fg ), |
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's' => absint( $s ), |
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), |
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'https://s0.wp.com/latex.php' |
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); |
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return sprintf( |
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'<img src="%1$s" alt="%2$s" title="%2$s" class="latex" />', |
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esc_url( $url ), |
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str_replace( '\\', '\', esc_attr( $latex ) ) |
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); |
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} |
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/** |
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* The shortcode way. The attributes are the same as the old ones - 'fg' and 'bg', instead of foreground |
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* and background, and 's' is for the font size. |
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* |
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* Example: [latex s=4 bg=00f fg=ff0]\LaTeX[/latex] |
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* |
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* @param array $atts Shortcode attributes. |
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* @param string $content Post content. |
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*/ |
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function latex_shortcode( $atts, $content = '' ) { |
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$attributes = shortcode_atts( |
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array( |
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'fg' => latex_get_default_color( 'text', '000' ), |
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'bg' => latex_get_default_color( 'bg' ), |
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's' => 0, |
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), |
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$atts, |
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'latex' |
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); |
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return latex_render( |
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latex_entity_decode( $content ), |
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$attributes['fg'], |
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$attributes['bg'], |
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$attributes['s'] |
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); |
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} |
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/** |
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* LaTeX needs to be untexturized |
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* |
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* @param array $shortcodes An array of shortcodes to exempt from texturizations. |
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*/ |
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function latex_no_texturize( $shortcodes ) { |
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$shortcodes[] = 'latex'; |
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return $shortcodes; |
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} |
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add_filter( 'no_texturize_shortcodes', 'latex_no_texturize' ); |
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add_filter( 'the_content', 'latex_markup', 9 ); // before wptexturize. |
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add_filter( 'comment_text', 'latex_markup', 9 ); // before wptexturize. |
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add_shortcode( 'latex', 'latex_shortcode' ); |
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Automattic /
jetpack
