diff options
Diffstat (limited to 'plugins/jetpack/modules/latex.php')
| -rw-r--r-- | plugins/jetpack/modules/latex.php | 53 |
1 files changed, 41 insertions, 12 deletions
diff --git a/plugins/jetpack/modules/latex.php b/plugins/jetpack/modules/latex.php index c006bafa..3257fdf3 100644 --- a/plugins/jetpack/modules/latex.php +++ b/plugins/jetpack/modules/latex.php @@ -23,7 +23,7 @@ function latex_markup( $content ) { $textarr = wp_html_split( $content ); - + $regex = '% \$latex(?:=\s*|\s+) ((?: @@ -33,7 +33,7 @@ function latex_markup( $content ) { )+) (?<!\\\\)\$ # Dollar preceded by zero slashes %ix'; - + foreach ( $textarr as &$element ) { if ( '' == $element || '<' === $element[0] ) { continue; @@ -83,12 +83,37 @@ function latex_entity_decode( $latex ) { return str_replace( array( '<', '>', '"', ''', '&', '&', "\n", "\r" ), array( '<', '>', '"', "'", '&', '&', ' ', ' ' ), $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 = "//s0.wp.com/latex.php?latex=" . urlencode( $latex ) . "&bg=" . $bg . "&fg=" . $fg . "&s=" . $s; - $url = esc_url( $url ); + $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 '<img src="' . $url . '" alt="' . $alt . '" title="' . $alt . '" class="latex" />'; + return sprintf( + '<img src="%1$s" alt="%2$s" class="latex" />', + esc_url( $url ), + $alt + ); } /** @@ -98,13 +123,17 @@ function latex_render( $latex, $fg, $bg, $s = 0 ) { * Example: [latex s=4 bg=00f fg=ff0]\LaTeX[/latex] */ function latex_shortcode( $atts, $content = '' ) { - extract( 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 ), $fg, $bg, $s ); + $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'] ); } /** |