Move jQuery specific tasks to independent files. Close gh-1334.

Also:
	* Confirm build task to the style guide
	* Use grunt API to load jQuery specific tasks
	* Add "use strict"; statements

1 files changed, 54 insertions, 0 deletions

diff --git a/build/tasks/uglify.js b/build/tasks/uglify.js
new file mode 100644
index 000000000..7c1a01bec
--- /dev/null
+++ b/build/tasks/uglify.js
@@ -0,0 +1,54 @@
+module.exports = function( grunt ) {
+
+	"use strict";
+
+	var fs = require( "fs" );
+
+	// Work around grunt-contrib-uglify sourceMap issues (jQuery #13776)
+	grunt.registerMultiTask( "pre-uglify", function() {
+		var banner = this.options().banner;
+
+		this.files.forEach(function( mapping ) {
+			// Join src
+			var input = mapping.src.map(function( file ) {
+				var contents = grunt.file.read( file );
+
+				// Strip banners
+				return contents
+					// Remove the main jQuery banner, it'll be replaced by the new banner anyway.
+					.replace( /^\/\*![\W\w]*?\*\/\n?/g, "" )
+					// Strip other banners preserving line count.
+					.replace( /^\/\*!(?:.|\n)*?\*\/\n?/gm, function ( match ) {
+						return match.replace( /[^\n]/gm, "" );
+					});
+			}).join("\n");
+
+			// Write temp file (with optional banner)
+			grunt.file.write( mapping.dest, ( banner || "" ) + input );
+		});
+	});
+
+	// Change the map file to point back to jquery.js instead of jquery.pre-min.js.
+	// The problem is caused by the pre-uglify task.
+	// Also, remove temporary files.
+	grunt.registerMultiTask( "post-uglify", function() {
+		this.files.forEach(function( mapping ) {
+			var mapFileName = mapping.src[ 0 ];
+
+			// Rename the file to a temporary name.
+			fs.renameSync( mapFileName, mapping.dest);
+			grunt.file.write( mapFileName, grunt.file.read( mapping.dest )
+				// The uglify task erroneously prepends dist/ to file names.
+				.replace( /"dist\//g, "\"" )
+				// Refer to the source jquery.js, not the temporary jquery.pre-min.js.
+				.replace( /\.pre-min\./g, "." )
+				// There's already a pragma at the beginning of the file, remove the one at the end.
+				.replace( /\/\/@ sourceMappingURL=jquery\.min\.map$/g, "" ));
+		});
+
+		// Remove temporary files.
+		this.options().tempFiles.forEach(function( fileName ) {
+			fs.unlink( fileName );
+		});
+	});
+};