use MagicString.Bundle for better sourcemap support

compiler/generate/index.js

@@ -1,4 +1,4 @@
-import MagicString from 'magic-string';
+import MagicString, { Bundle } from 'magic-string';
 import { walk } from 'estree-walker';
 import deindent from './utils/deindent.js';
 import isReference from './utils/isReference.js';
@@ -365,8 +365,6 @@ export default function generate ( parsed, source, options ) {
 				return state[ key ];
 			};
 
-			let setting = false;
-
 			this.set = function set ( newState ) {
 				${setStatements.join( '\n\n' )}
 			};
@@ -426,38 +424,26 @@ export default function generate ( parsed, source, options ) {
 	const parts = result.split( '✂]' );
 	const finalChunk = parts.pop();
 
-	const sortedByResult = parts.map( ( str, index ) => {
-		const match = pattern.exec( str );
+	const compiled = new Bundle({ separator: '' });
 
-		return {
-			index,
-			chunk: str.replace( pattern, '' ),
-			start: +match[1],
-			end: +match[2]
-		};
-	});
-
-	const sortedBySource = sortedByResult
-		.slice()
-		.sort( ( a, b ) => a.start - b.start );
+	parts.forEach( str => {
+		const match = pattern.exec( str );
 
-	let c = 0;
+		compiled.addSource({
+			filename: options.filename,
+			content: new MagicString( str.replace( pattern, '' ) )
+		});
 
-	sortedBySource.forEach( part => {
-		generator.code.remove( c, part.start );
-		generator.code.insertRight( part.start, part.chunk );
-		c = part.end;
+		compiled.addSource({
+			filename: options.filename,
+			content: generator.code.snip( +match[1], +match[2] )
+		});
 	});
 
-	generator.code.remove( c, source.length );
-	generator.code.append( finalChunk );
-
-	sortedByResult.forEach( part => {
-		generator.code.move( part.start, part.end, 0 );
-	});
+	compiled.append( finalChunk );
 
 	return {
-		code: generator.code.toString(),
-		map: generator.code.generateMap()
+		code: compiled.toString(),
+		map: compiled.generateMap()
 	};
 }

compiler/generate/visitors/EachBlock.js

@@ -11,7 +11,7 @@ export default {
 
 		generator.addSourcemapLocations( node.expression );
 
-		const { dependencies, snippet, string } = generator.contextualise( node.expression );
+		const { dependencies, snippet } = generator.contextualise( node.expression );
 
 		generator.current.initStatements.push( deindent`
 			var ${name}_anchor = document.createComment( ${JSON.stringify( `#each ${generator.source.slice( node.expression.start, node.expression.end )}` )} );
@@ -29,7 +29,7 @@ export default {
 		` );
 
 		generator.current.updateStatements.push( deindent`
-			var ${name}_value = ${string};
+			var ${name}_value = ${snippet};
 
 			for ( var i = 0; i < ${name}_value.length; i += 1 ) {
 				if ( !${name}_iterations[i] ) {

compiler/generate/visitors/IfBlock.js

@@ -11,7 +11,7 @@ export default {
 		const elseRenderer = `renderElseBlock_${i}`;
 
 		generator.addSourcemapLocations( node.expression );
-		const { snippet, string } = generator.contextualise( node.expression );
+		const { snippet } = generator.contextualise( node.expression );
 
 		generator.current.initStatements.push( deindent`
 			var ${name}_anchor = document.createComment( ${JSON.stringify( `#if ${generator.source.slice( node.expression.start, node.expression.end )}` )} );
@@ -70,7 +70,7 @@ export default {
 		}
 
 		let update = deindent`
-			if ( ${string} ) {
+			if ( ${snippet} ) {
 				${ifTrue.join( '\n\n' )}
 			}
 

compiler/generate/visitors/MustacheTag.js

@@ -1,11 +1,10 @@
 import deindent from '../utils/deindent.js';
-import isReference from '../utils/isReference.js';
 
 export default {
 	enter ( generator, node ) {
 		const name = generator.current.counter( 'text' );
 
-		const { snippet, string } = generator.contextualise( node.expression );
+		const { snippet } = generator.contextualise( node.expression );
 
 		generator.current.initStatements.push( deindent`
 			var ${name} = document.createTextNode( ${snippet} );
@@ -15,7 +14,7 @@ export default {
 		generator.addSourcemapLocations( node.expression );
 
 		generator.current.updateStatements.push( deindent`
-			${name}.data = ${string};
+			${name}.data = ${snippet};
 		` );
 	}
 };

compiler/generate/visitors/attributes/addElementAttributes.js

@@ -61,11 +61,11 @@ export default function addElementAttributes ( generator, node, local ) {
 					dynamic = true;
 
 					// dynamic – but potentially non-string – attributes
-					const { snippet, string } = generator.contextualise( value.expression );
+					const { snippet } = generator.contextualise( value.expression );
 
 					const updater = propertyName ?
 						`${local.name}.${propertyName} = ${snippet};` :
-						`${local.name}.setAttribute( '${attribute.name}', ${string} );`; // TODO use snippet both times – see note below
+						`${local.name}.setAttribute( '${attribute.name}', ${snippet} );`; // TODO use snippet both times – see note below
 
 					local.init.push( updater );
 					local.update.push( updater );

test/compiler/each-blocks-nested/_config.js

@@ -1,6 +1,4 @@
 export default {
-	solo: true,
-
 	data: {
 		columns: [ 'a', 'b', 'c' ],
 		rows: [ 1, 2, 3 ]