Initial commit

2017-01-12 23:10:07 +00:00 · 2017-01-12 23:10:07 +00:00 · 28e6ddf404
commit 28e6ddf404
1083 changed files with 191734 additions and 0 deletions
--- a/plugins/jetpack/modules/latex.php
+++ b/plugins/jetpack/modules/latex.php
@ -0,0 +1,121 @@
+<?php
+/**
+ * Module Name: Beautiful Math
+ * Module Description: Use LaTeX markup language in posts and pages for complex equations and other geekery.
+ * Sort Order: 12
+ * First Introduced: 1.1
+ * Requires Connection: No
+ * Auto Activate: Yes
+ * Module Tags: Writing
+ * Additional Search Queries: latex, math, equation, equations, formula, code
+ */
+
+/**
+ * LaTeX support.
+ *
+ * Backward compatibility requires support for both "[latex][/latex]", and
+ * "$latex $" shortcodes.
+ *
+ * $latex e^{\i \pi} + 1 = 0$  ->  [latex]e^{\i \pi} + 1 = 0[/latex]
+ * $latex [a, b]$              ->  [latex][a, b][/latex]
+ */
+
+function latex_markup( $content ) {
+	$textarr = wp_html_split( $content );
+	
+	$regex = '%
+		\$latex(?:=\s*|\s+)
+		((?:
+			[^$]+ # Not a dollar
+		|
+			(?<=(?<!\\\\)\\\\)\$ # Dollar preceded by exactly one slash
+		)+)
+		(?<!\\\\)\$ # Dollar preceded by zero slashes
+	%ix';
+	
+	foreach ( $textarr as &$element ) {
+		if ( '' == $element || '<' === $element[0] ) {
+			continue;
+		}
+
+		if ( false === stripos( $element, '$latex' ) ) {
+			continue;
+		}
+
+		$element = preg_replace_callback( $regex, 'latex_src', $element );
+	}
+
+	return implode( '', $textarr );
+}
+
+function latex_src( $matches ) {
+	$latex = $matches[1];
+
+	$bg = latex_get_default_color( 'bg' );
+	$fg = latex_get_default_color( 'text', '000' );
+	$s = 0;
+
+
+	$latex = latex_entity_decode( $latex );
+	if ( preg_match( '/.+(&fg=[0-9a-f]{6}).*/i', $latex, $fg_matches ) ) {
+		$fg = substr( $fg_matches[1], 4 );
+		$latex = str_replace( $fg_matches[1], '', $latex );
+	}
+	if ( preg_match( '/.+(&bg=[0-9a-f]{6}).*/i', $latex, $bg_matches ) ) {
+		$bg = substr( $bg_matches[1], 4 );
+		$latex = str_replace( $bg_matches[1], '', $latex );
+	}
+	if ( preg_match( '/.+(&s=[0-9-]{1,2}).*/i', $latex, $s_matches ) ) {
+		$s = (int) substr( $s_matches[1], 3 );
+		$latex = str_replace( $s_matches[1], '', $latex );
+	}
+
+	return latex_render( $latex, $fg, $bg, $s );
+}
+
+function latex_get_default_color( $color, $default_color = 'ffffff' ) {
+	global $themecolors;
+	return isset($themecolors[$color]) ? $themecolors[$color] : $default_color;
+}
+
+function latex_entity_decode( $latex ) {
+	return str_replace( array( '&lt;', '&gt;', '&quot;', '&#039;', '&#038;', '&amp;', "\n", "\r" ), array( '<', '>', '"', "'", '&', '&', ' ', ' ' ), $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 );
+	$alt = str_replace( '\\', '&#92;', esc_attr( $latex ) );
+
+	return '<img src="' . $url . '" alt="' . $alt . '" title="' . $alt . '" class="latex" />';
+}
+
+/**
+ * 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]
+ */
+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 );
+}
+
+/**
+ * LaTeX needs to be untexturized
+ */
+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' );