Administration: Remove old IE9 code from wp-admin/js/svg-painter.js.

About half of the file's code was a back-compat polyfill of base64 functions for IE9.

Since WordPress no longer supports IE9 as of version 4.8, and all modern browsers come with these functions, the polyfills can be removed.

Follow-up to [26072], [26131], [26601], [47771].

Props TobiasBg, sabernhardt.
Fixes #61995.

git-svn-id: https://develop.svn.wordpress.org/trunk@58997 602fd350-edb4-49c9-b593-d223f7449a82

src/js/_enqueues/wp/svg-painter.js

@@ -8,123 +8,22 @@ window.wp = window.wp || {};
 
 wp.svgPainter = ( function( $, window, document, undefined ) {
 	'use strict';
-	var selector, base64, painter,
+	var selector, painter,
 		colorscheme = {},
 		elements = [];
 
 	$( function() {
-		// Detection for browser SVG capability.
-		if ( document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' ) ) {
-			$( document.body ).removeClass( 'no-svg' ).addClass( 'svg' );
-			wp.svgPainter.init();
-		}
+		wp.svgPainter.init();
 	});
 
-	/**
-	 * Needed only for IE9
-	 *
-	 * Based on jquery.base64.js 0.0.3 - https://github.com/yckart/jquery.base64.js
-	 *
-	 * Based on: https://gist.github.com/Yaffle/1284012
-	 *
-	 * Copyright (c) 2012 Yannick Albert (http://yckart.com)
-	 * Licensed under the MIT license
-	 * http://www.opensource.org/licenses/mit-license.php
-	 */
-	base64 = ( function() {
-		var c,
-			b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
-			a256 = '',
-			r64 = [256],
-			r256 = [256],
-			i = 0;
-
-		function init() {
-			while( i < 256 ) {
-				c = String.fromCharCode(i);
-				a256 += c;
-				r256[i] = i;
-				r64[i] = b64.indexOf(c);
-				++i;
-			}
-		}
-
-		function code( s, discard, alpha, beta, w1, w2 ) {
-			var tmp, length,
-				buffer = 0,
-				i = 0,
-				result = '',
-				bitsInBuffer = 0;
-
-			s = String(s);
-			length = s.length;
-
-			while( i < length ) {
-				c = s.charCodeAt(i);
-				c = c < 256 ? alpha[c] : -1;
-
-				buffer = ( buffer << w1 ) + c;
-				bitsInBuffer += w1;
-
-				while( bitsInBuffer >= w2 ) {
-					bitsInBuffer -= w2;
-					tmp = buffer >> bitsInBuffer;
-					result += beta.charAt(tmp);
-					buffer ^= tmp << bitsInBuffer;
-				}
-				++i;
-			}
-
-			if ( ! discard && bitsInBuffer > 0 ) {
-				result += beta.charAt( buffer << ( w2 - bitsInBuffer ) );
-			}
-
-			return result;
-		}
-
-		function btoa( plain ) {
-			if ( ! c ) {
-				init();
-			}
-
-			plain = code( plain, false, r256, b64, 8, 6 );
-			return plain + '===='.slice( ( plain.length % 4 ) || 4 );
-		}
-
-		function atob( coded ) {
-			var i;
-
-			if ( ! c ) {
-				init();
-			}
-
-			coded = coded.replace( /[^A-Za-z0-9\+\/\=]/g, '' );
-			coded = String(coded).split('=');
-			i = coded.length;
-
-			do {
-				--i;
-				coded[i] = code( coded[i], true, r64, a256, 6, 8 );
-			} while ( i > 0 );
-
-			coded = coded.join('');
-			return coded;
-		}
-
-		return {
-			atob: atob,
-			btoa: btoa
-		};
-	})();
-
 	return {
 		init: function() {
 			painter = this;
 			selector = $( '#adminmenu .wp-menu-image, #wpadminbar .ab-item' );
 
-			this.setColors();
-			this.findElements();
-			this.paint();
+			painter.setColors();
+			painter.findElements();
+			painter.paint();
 		},
 
 		setColors: function( colors ) {
@@ -201,11 +100,7 @@ wp.svgPainter = ( function( $, window, document, undefined ) {
 				}
 
 				try {
-					if ( 'atob' in window ) {
-						xml = window.atob( encoded[1] );
-					} else {
-						xml = base64.atob( encoded[1] );
-					}
+					xml = window.atob( encoded[1] );
 				} catch ( error ) {}
 
 				if ( xml ) {
@@ -218,11 +113,7 @@ wp.svgPainter = ( function( $, window, document, undefined ) {
 					// Replace `fill` properties in `<style>` tags.
 					xml = xml.replace( /fill:.*?;/g, 'fill: ' + color + ';');
 
-					if ( 'btoa' in window ) {
-						xml = window.btoa( xml );
-					} else {
-						xml = base64.btoa( xml );
-					}
+					xml = window.btoa( xml );
 
 					$element.data( 'wp-ui-svg-' + color, xml );
 				} else {

src/wp-admin/admin-header.php

@@ -203,7 +203,7 @@
 	$admin_body_class .= ' network-admin';
 }
 
-$admin_body_class .= ' no-customize-support no-svg';
+$admin_body_class .= ' no-customize-support svg';
 
 if ( $current_screen->is_block_editor() ) {
 	$admin_body_class .= ' block-editor-page wp-embed-responsive';