Sourcemaps

.gitignore

@@ -4,3 +4,5 @@ dist
 .nyc_output
 coverage
 coverage.lcov
+test/sourcemaps/*/output.js
+test/sourcemaps/*/output.js.map

compiler/generate/index.js

@@ -86,7 +86,7 @@ export default function generate ( parsed, source, options ) {
 						const { name } = flattenReference( node );
 
 						if ( parent && parent.type === 'CallExpression' && node === parent.callee ) {
-							if ( generator.helpers[ name ] ) generator.code.insertRight( node.start, `template.helpers.` );
+							if ( generator.helpers[ name ] ) generator.code.prependRight( node.start, `template.helpers.` );
 							return;
 						}
 
@@ -102,7 +102,7 @@ export default function generate ( parsed, source, options ) {
 							if ( !~usedContexts.indexOf( context ) ) usedContexts.push( context );
 						} else {
 							dependencies.push( node.name );
-							generator.code.insertRight( node.start, `root.` );
+							generator.code.prependRight( node.start, `root.` );
 							if ( !~usedContexts.indexOf( 'root' ) ) usedContexts.push( 'root' );
 						}
 
@@ -204,19 +204,19 @@ export default function generate ( parsed, source, options ) {
 				while ( /\s/.test( source[ i - 1 ] ) ) i--;
 
 				const indentation = source.slice( i, defaultExport.start );
-				generator.code.insertLeft( finalNode.end, `\n\n${indentation}return template;` );
+				generator.code.appendLeft( finalNode.end, `\n\n${indentation}return template;` );
 			}
 
 			defaultExport.declaration.properties.forEach( prop => {
 				templateProperties[ prop.key.name ] = prop.value;
 			});
 
-			generator.code.insertRight( parsed.js.content.start, 'var template = (function () {' );
+			generator.code.prependRight( parsed.js.content.start, 'var template = (function () {' );
 		} else {
-			generator.code.insertRight( parsed.js.content.start, '(function () {' );
+			generator.code.prependRight( parsed.js.content.start, '(function () {' );
 		}
 
-		generator.code.insertLeft( parsed.js.content.end, '}());' );
+		generator.code.appendLeft( parsed.js.content.end, '}());' );
 
 		[ 'helpers', 'events', 'components' ].forEach( key => {
 			if ( templateProperties[ key ] ) {
@@ -508,30 +508,35 @@ export default function generate ( parsed, source, options ) {
 
 	function addString ( str ) {
 		compiled.addSource({
-			filename: options.filename,
 			content: new MagicString( str )
 		});
 	}
 
-	addString( getIntro( format, options, imports ) );
+	const intro = getIntro( format, options, imports );
+	if ( intro ) addString( intro );
+
+	// a filename is necessary for sourcemap generation
+	const filename = options.filename || 'SvelteComponent.html';
 
 	parts.forEach( str => {
+		const chunk = str.replace( pattern, '' );
+		if ( chunk ) addString( chunk );
+
 		const match = pattern.exec( str );
 
-		addString( str.replace( pattern, '' ) );
+		const snippet = generator.code.snip( +match[1], +match[2] );
 
 		compiled.addSource({
-			filename: options.filename,
-			content: generator.code.snip( +match[1], +match[2] )
+			filename,
+			content: snippet
 		});
 	});
 
-	compiled.append( finalChunk );
-
+	addString( finalChunk );
 	addString( '\n\n' + getOutro( format, constructorName, options, imports ) );
 
 	return {
 		code: compiled.toString(),
-		map: compiled.generateMap()
+		map: compiled.generateMap({ includeContent: true })
 	};
 }

compiler/generate/visitors/attributes/addComponentAttributes.js

@@ -80,7 +80,7 @@ export default function addComponentAttributes ( generator, node, local ) {
 		else if ( attribute.type === 'EventHandler' ) {
 			// TODO verify that it's a valid callee (i.e. built-in or declared method)
 			generator.addSourcemapLocations( attribute.expression );
-			generator.code.insertRight( attribute.expression.start, 'component.' );
+			generator.code.prependRight( attribute.expression.start, 'component.' );
 
 			const usedContexts = new Set();
 			attribute.expression.arguments.forEach( arg => {

compiler/generate/visitors/attributes/addElementAttributes.js

@@ -116,7 +116,7 @@ export default function addElementAttributes ( generator, node, local ) {
 		else if ( attribute.type === 'EventHandler' ) {
 			// TODO verify that it's a valid callee (i.e. built-in or declared method)
 			generator.addSourcemapLocations( attribute.expression );
-			generator.code.insertRight( attribute.expression.start, 'component.' );
+			generator.code.prependRight( attribute.expression.start, 'component.' );
 
 			const usedContexts = new Set();
 			attribute.expression.arguments.forEach( arg => {

package.json

@@ -47,7 +47,7 @@
     "fuzzyset.js": "0.0.1",
     "jsdom": "^9.8.3",
     "locate-character": "^2.0.0",
-    "magic-string": "^0.16.0",
+    "magic-string": "^0.19.0",
     "mocha": "^3.1.2",
     "node-resolve": "^1.3.3",
     "nyc": "^9.0.1",
@@ -56,6 +56,7 @@
     "rollup-plugin-buble": "^0.14.0",
     "rollup-plugin-commonjs": "^5.0.5",
     "rollup-plugin-node-resolve": "^2.0.0",
+    "source-map": "^0.5.6",
     "source-map-support": "^0.4.6"
   },
   "nyc": {

test/sourcemaps/basic/input.html

@@ -0,0 +1 @@
+{{foo.bar.baz}}

test/sourcemaps/basic/test.js

@@ -0,0 +1,34 @@
+export function test ({ assert, smc, locateInSource, locateInGenerated }) {
+	const expected = locateInSource( 'foo.bar.baz' );
+
+	let loc;
+	let actual;
+
+	loc = locateInGenerated( 'foo.bar.baz' );
+
+	actual = smc.originalPositionFor({
+		line: loc.line + 1,
+		column: loc.column
+	});
+
+	assert.deepEqual( actual, {
+		source: 'SvelteComponent.html',
+		name: null,
+		line: expected.line + 1,
+		column: expected.column
+	});
+
+	loc = locateInGenerated( 'foo.bar.baz', loc.character + 1 );
+
+	actual = smc.originalPositionFor({
+		line: loc.line + 1,
+		column: loc.column
+	});
+
+	assert.deepEqual( actual, {
+		source: 'SvelteComponent.html',
+		name: null,
+		line: expected.line + 1,
+		column: expected.column
+	});
+}

test/sourcemaps/script/input.html

@@ -0,0 +1,9 @@
+<div></div>
+
+<script>
+	export default {
+		onrender () {
+			console.log( 42 );
+		}
+	}
+</script>

test/sourcemaps/script/test.js

@@ -0,0 +1,16 @@
+export function test ({ assert, smc, locateInSource, locateInGenerated }) {
+	const expected = locateInSource( '42' );
+	const loc = locateInGenerated( '42' );
+
+	const actual = smc.originalPositionFor({
+		line: loc.line + 1,
+		column: loc.column
+	});
+
+	assert.deepEqual( actual, {
+		source: 'SvelteComponent.html',
+		name: null,
+		line: expected.line + 1,
+		column: expected.column
+	});
+}

test/test.js

@@ -5,6 +5,8 @@ import * as path from 'path';
 import * as fs from 'fs';
 import jsdom from 'jsdom';
 import * as acorn from 'acorn';
+import { SourceMapConsumer } from 'source-map';
+import { getLocator } from 'locate-character';
 
 import * as consoleGroup from 'console-group';
 consoleGroup.install();
@@ -468,4 +470,29 @@ describe( 'svelte', () => {
 			});
 		});
 	});
+
+	describe( 'sourcemaps', () => {
+		fs.readdirSync( 'test/sourcemaps' ).forEach( dir => {
+			if ( dir[0] === '.' ) return;
+
+			const solo = exists( `test/sourcemaps/${dir}/solo` );
+
+			( solo ? it.only : it )( dir, () => {
+				const input = fs.readFileSync( `test/sourcemaps/${dir}/input.html`, 'utf-8' ).replace( /\s+$/, '' );
+				const { code, map } = svelte.compile( input );
+
+				fs.writeFileSync( `test/sourcemaps/${dir}/output.js`, `${code}\n//# sourceMappingURL=output.js.map` );
+				fs.writeFileSync( `test/sourcemaps/${dir}/output.js.map`, JSON.stringify( map, null, '  ' ) );
+
+				const { test } = require( `./sourcemaps/${dir}/test.js` );
+
+				const smc = new SourceMapConsumer( map );
+
+				const locateInSource = getLocator( input );
+				const locateInGenerated = getLocator( code );
+
+				test({ assert, code, map, smc, locateInSource, locateInGenerated });
+			});
+		});
+	});
 });