[latex]e^{\i \pi} + 1 = 0[/latex] * $latex [a, b]$ -> [latex][a, b][/latex] */ /** * Markup LaTeX content. * * @param string $content Post or comment contents to markup. */ function latex_markup( $content ) { $textarr = wp_html_split( $content ); $regex = '% \$latex(?:=\s*|\s+) ((?: [^$]+ # Not a dollar | (?<=(?', '"', "'", '&', '&', ' ', ' ' ), $latex ); } /** * Returns the URL for the server-side rendered image of LaTeX. * * @param string $latex LaTeX string. * @param string $fg Foreground color. * @param string $bg Background color. * @param int $s Matches. * * @return string Image URL for the rendered LaTeX. */ function latex_render( $latex, $fg, $bg, $s = 0 ) { $url = add_query_arg( urlencode_deep( array( 'latex' => $latex, 'bg' => $bg, 'fg' => $fg, 's' => $s, 'c' => '20201002', // cache buster. Added 2020-10-02 after server migration caused faulty rendering. ) ), ( is_ssl() ? 'https://' : 'http://' ) . 's0.wp.com/latex.php' ); $alt = str_replace( '\\', '\', esc_attr( $latex ) ); return sprintf( '', esc_url( $url ), $alt ); } /** * The shortcode way. The attributes are the same as the old ones - 'fg' and 'bg', instead of foreground * and background, and 's' is for the font size. * * Example: [latex s=4 bg=00f fg=ff0]\LaTeX[/latex] * * @param array $atts Shortcode attributes. * @param string $content Content to format. */ function latex_shortcode( $atts, $content = '' ) { $attr = shortcode_atts( array( 's' => 0, 'bg' => latex_get_default_color( 'bg' ), 'fg' => latex_get_default_color( 'text', '000' ), ), $atts, 'latex' ); return latex_render( latex_entity_decode( $content ), $attr['fg'], $attr['bg'], $attr['s'] ); } /** * LaTeX needs to be untexturized. * * @param array $shortcodes Array of shortcodes not to texturize. */ function latex_no_texturize( $shortcodes ) { $shortcodes[] = 'latex'; return $shortcodes; } add_filter( 'no_texturize_shortcodes', 'latex_no_texturize' ); add_filter( 'the_content', 'latex_markup', 9 ); // Before wptexturize. add_filter( 'comment_text', 'latex_markup', 9 ); // Before wptexturize. add_shortcode( 'latex', 'latex_shortcode' );