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<?php

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/**

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* Module Name: Beautiful Math

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* Module Description: Add beautifully formatted math equations to your posts and pages using LaTeX.

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* Sort Order: 12

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* First Introduced: 1.1

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* Requires Connection: No

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* Auto Activate: No

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* Module Tags: Writing

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* Feature: Writing

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* Additional Search Queries: latex, math, equation, equations, formula, code

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* @package automattic/jetpack

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if ( ! defined( 'ABSPATH' ) ) {

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exit( 0 );

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}

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/**

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* LaTeX support.

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* Backward compatibility requires support for both "[latex][/latex]", and

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* "$latex $" shortcodes.

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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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/**

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* Markup LaTeX content.

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* @param string $content Post or comment contents to markup.

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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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* Process LaTeX string to rendered image.

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* @param array $matches Matched regex results.

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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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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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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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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 the default color for an attribute.

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* @param string $color Attribute to color (e.g. bg).

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* @param string $default_color Default fallback color to use.

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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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* Decode special characters in a LaTeX string.

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* @param string $latex Character encoded content.

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function latex_entity_decode( $latex ) {

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return str_replace( array( '<', '>', '"', ''', '&', '&', "\n", "\r" ), array( '<', '>', '"', "'", '&', '&', ' ', ' ' ), $latex );

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}

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/**

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* Returns the URL for the server-side rendered image of LaTeX.

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* @param string $latex LaTeX string.

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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 Matches.

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* @return string Image URL for the rendered LaTeX.

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function latex_render( $latex, $fg, $bg, $s = 0 ) {

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$url = add_query_arg(

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urlencode_deep(

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array(

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'latex' => $latex,

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'bg' => $bg,

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'fg' => $fg,

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's' => $s,

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'c' => '20201002', // cache buster. Added 2020-10-02 after server migration caused faulty rendering.

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)

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( is_ssl() ? 'https://' : 'http://' ) . 's0.wp.com/latex.php'

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);

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$alt = str_replace( '\\', '\', esc_attr( $latex ) );

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return sprintf(

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'<img src="%1$s" alt="%2$s" class="latex" />',

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esc_url( $url ),

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$alt

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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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* Example: [latex s=4 bg=00f fg=ff0]\LaTeX[/latex]

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* @param array $atts Shortcode attributes.

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* @param string $content Content to format.

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function latex_shortcode( $atts, $content = '' ) {

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$attr = shortcode_atts(

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array(

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's' => 0,

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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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$atts,

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'latex'

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);

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return latex_render( latex_entity_decode( $content ), $attr['fg'], $attr['bg'], $attr['s'] );

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}

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/**

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* LaTeX needs to be untexturized.

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* @param array $shortcodes Array of shortcodes not to texturize.

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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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