introduce preliminary Scala support, highly inspired by src/java content.

src/monaco.contribution.ts

@@ -53,6 +53,7 @@ import './restructuredtext/restructuredtext.contribution';
 import './ruby/ruby.contribution';
 import './rust/rust.contribution';
 import './sb/sb.contribution';
+import './scala/scala.contribution';
 import './scheme/scheme.contribution';
 import './scss/scss.contribution';
 import './shell/shell.contribution';

src/scala/scala.contribution.ts

@@ -0,0 +1,15 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import { registerLanguage } from '../_.contribution';
+
+registerLanguage({
+	id: 'scala',
+	extensions: ['.scala', '.sc'],
+	aliases: ['Scala', 'scala'],
+	mimetypes: ['text/x-scala-source', 'text/x-scala'],
+	loader: () => import('./scala')
+});

src/scala/scala.test.ts

@@ -0,0 +1,649 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import { testTokenization } from '../test/testRunner';
+
+testTokenization('scala', [
+	// Comments - single line
+	[{
+		line: '//',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' }
+		]
+	}],
+
+	[{
+		line: '    // a comment',
+		tokens: [
+			{ startIndex: 0, type: '' },
+			{ startIndex: 4, type: 'comment.scala' }
+		]
+	}],
+
+	// Broken nested tokens due to invalid comment tokenization
+	[{
+		line: '/* //*/ a',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' },
+			{ startIndex: 7, type: '' },
+			{ startIndex: 8, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '// a comment',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' }
+		]
+	}],
+
+	[{
+		line: '//sticky comment',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' }
+		]
+	}],
+
+	[{
+		line: '/almost a comment',
+		tokens: [
+			{ startIndex: 0, type: 'delimiter.scala' },
+			{ startIndex: 1, type: 'identifier.scala' },
+			{ startIndex: 7, type: '' },
+			{ startIndex: 8, type: 'identifier.scala' },
+			{ startIndex: 9, type: '' },
+			{ startIndex: 10, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '1 / 2; /* comment',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: '' },
+			{ startIndex: 2, type: 'delimiter.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'number.scala' },
+			{ startIndex: 5, type: 'delimiter.scala' },
+			{ startIndex: 6, type: '' },
+			{ startIndex: 7, type: 'comment.scala' }
+		]
+	}],
+
+	[{
+		line: 'val x: Int = 1; // my comment // is a nice one',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.val.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'identifier.scala' },
+			{ startIndex: 5, type: 'delimiter.scala' },
+			{ startIndex: 6, type: '' },
+			{ startIndex: 7, type: 'keyword.Int.scala' },
+			{ startIndex: 10, type: '' },
+			{ startIndex: 11, type: 'delimiter.scala' },
+			{ startIndex: 12, type: '' },
+			{ startIndex: 13, type: 'number.scala' },
+			{ startIndex: 14, type: 'delimiter.scala' },
+			{ startIndex: 15, type: '' },
+			{ startIndex: 16, type: 'comment.scala' }
+		]
+	}],
+
+	// Comments - range comment, single line
+	[{
+		line: '/* a simple comment */',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' }
+		]
+	}],
+
+	[{
+		line: 'val x: Int = /* a simple comment */ 1;',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.val.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'identifier.scala' },
+			{ startIndex: 5, type: 'delimiter.scala' },
+			{ startIndex: 6, type: '' },
+			{ startIndex: 7, type: 'keyword.Int.scala' },
+			{ startIndex: 10, type: '' },
+			{ startIndex: 11, type: 'delimiter.scala' },
+			{ startIndex: 12, type: '' },
+			{ startIndex: 13, type: 'comment.scala' },
+			{ startIndex: 35, type: '' },
+			{ startIndex: 36, type: 'number.scala' },
+			{ startIndex: 37, type: 'delimiter.scala' }
+		]
+	}],
+
+	[{
+		line: 'val x: Int = /* a simple comment */ 1; */',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.val.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'identifier.scala' },
+			{ startIndex: 5, type: 'delimiter.scala' },
+			{ startIndex: 6, type: '' },
+			{ startIndex: 7, type: 'keyword.Int.scala' },
+			{ startIndex: 10, type: '' },
+			{ startIndex: 11, type: 'delimiter.scala' },
+			{ startIndex: 12, type: '' },
+			{ startIndex: 13, type: 'comment.scala' },
+			{ startIndex: 35, type: '' },
+			{ startIndex: 36, type: 'number.scala' },
+			{ startIndex: 37, type: 'delimiter.scala' },
+			{ startIndex: 38, type: '' }
+		]
+	}],
+
+	[{
+		line: 'x = /**/;',
+		tokens: [
+			{ startIndex: 0, type: 'identifier.scala' },
+			{ startIndex: 1, type: '' },
+			{ startIndex: 2, type: 'delimiter.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'comment.scala' },
+			{ startIndex: 8, type: 'delimiter.scala' }
+		]
+	}],
+
+	[{
+		line: 'x = /*/;',
+		tokens: [
+			{ startIndex: 0, type: 'identifier.scala' },
+			{ startIndex: 1, type: '' },
+			{ startIndex: 2, type: 'delimiter.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'comment.scala' }
+		]
+	}],
+
+	// Comments - range comment, multiple lines
+	[{
+		line: '/* start of multiline comment',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' }
+		]
+	}, {
+		line: 'a comment between without a star',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' }
+		]
+	}, {
+		line: 'end of multiline comment*/',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' }
+		]
+	}],
+
+	[{
+		line: 'val x: Int = /* start a comment',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.val.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'identifier.scala' },
+			{ startIndex: 5, type: 'delimiter.scala' },
+			{ startIndex: 6, type: '' },
+			{ startIndex: 7, type: 'keyword.Int.scala' },
+			{ startIndex: 10, type: '' },
+			{ startIndex: 11, type: 'delimiter.scala' },
+			{ startIndex: 12, type: '' },
+			{ startIndex: 13, type: 'comment.scala' },
+		]
+	}, {
+		line: ' a ',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' },
+		]
+	}, {
+		line: 'and end it */ 2;',
+		tokens: [
+			{ startIndex: 0, type: 'comment.scala' },
+			{ startIndex: 13, type: '' },
+			{ startIndex: 14, type: 'number.scala' },
+			{ startIndex: 15, type: 'delimiter.scala' }
+		]
+	}],
+
+	// Scala Doc, multiple lines
+	[{
+		line: '/** start of Scala Doc',
+		tokens: [
+			{ startIndex: 0, type: 'comment.doc.scala' }
+		]
+	}, {
+		line: 'a comment between without a star',
+		tokens: [
+			{ startIndex: 0, type: 'comment.doc.scala' }
+		]
+	}, {
+		line: 'end of multiline comment*/',
+		tokens: [
+			{ startIndex: 0, type: 'comment.doc.scala' }
+		]
+	}],
+
+	// Keywords
+	[{
+		line: 'package test; object Program { def main(args: Array[String]): Unit = {} }',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.package.scala' },
+			{ startIndex: 7, type: '' },
+			{ startIndex: 8, type: 'identifier.scala' },
+			{ startIndex: 12, type: 'delimiter.scala' },
+			{ startIndex: 13, type: '' },
+			{ startIndex: 14, type: 'keyword.object.scala' },
+			{ startIndex: 20, type: '' },
+			{ startIndex: 21, type: 'identifier.scala' },
+			{ startIndex: 28, type: '' },
+			{ startIndex: 29, type: 'delimiter.curly.scala' },
+			{ startIndex: 30, type: '' },
+			{ startIndex: 31, type: 'keyword.def.scala' },
+			{ startIndex: 34, type: '' },
+			{ startIndex: 35, type: 'identifier.scala' },
+			{ startIndex: 39, type: 'delimiter.parenthesis.scala' },
+			{ startIndex: 40, type: 'identifier.scala' },
+			{ startIndex: 44, type: 'delimiter.scala' },
+			{ startIndex: 45, type: '' },
+			{ startIndex: 46, type: 'identifier.scala' },
+			{ startIndex: 51, type: 'delimiter.square.scala' },
+			{ startIndex: 52, type: 'identifier.scala' },
+			{ startIndex: 58, type: 'delimiter.square.scala' },
+			{ startIndex: 59, type: 'delimiter.parenthesis.scala' },
+			{ startIndex: 60, type: 'delimiter.scala' },
+			{ startIndex: 61, type: '' },
+			{ startIndex: 62, type: 'keyword.Unit.scala' },
+			{ startIndex: 66, type: '' },
+			{ startIndex: 67, type: 'delimiter.scala' },
+			{ startIndex: 68, type: '' },
+			{ startIndex: 69, type: 'delimiter.curly.scala' },
+			{ startIndex: 71, type: '' },
+			{ startIndex: 72, type: 'delimiter.curly.scala' }
+		]
+	}],
+
+	// Numbers
+	[{
+		line: '0',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' }
+		]
+	}],
+
+	[{
+		line: '0.10',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '0x',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '0x123',
+		tokens: [
+			{ startIndex: 0, type: 'number.hex.scala' }
+		]
+	}],
+
+	[{
+		line: '0x5_2',
+		tokens: [
+			{ startIndex: 0, type: 'number.hex.scala' }
+		]
+	}],
+
+	[{
+		line: '10e3',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '10f',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5e3',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5e-3',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5E3',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5E-3',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5F',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5f',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5D',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5d',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '1.72E3D',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '1.72E3d',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '1.72E-3d',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '1.72e3D',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '1.72e3d',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '1.72e-3d',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '23L',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' }
+		]
+	}],
+
+	[{
+		line: '23l',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' }
+		]
+	}],
+
+	[{
+		line: '5_2',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' }
+		]
+	}],
+
+	[{
+		line: '5_______2',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' }
+		]
+	}],
+
+	[{
+		line: '3_.1415F',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: 'identifier.scala' },
+			{ startIndex: 2, type: 'delimiter.scala' },
+			{ startIndex: 3, type: 'number.float.scala' }
+		]
+	}],
+
+	[{
+		line: '3._1415F',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: 'delimiter.scala' },
+			{ startIndex: 2, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '999_99_9999_L',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 11, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '52_',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 2, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '0_x52',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '0x_52',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '0x52_',
+		tokens: [
+			{ startIndex: 0, type: 'number.hex.scala' },
+			{ startIndex: 4, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '23.5L',
+		tokens: [
+			{ startIndex: 0, type: 'number.float.scala' },
+			{ startIndex: 4, type: 'identifier.scala' }
+		]
+	}],
+
+	[{
+		line: '0+0',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: 'delimiter.scala' },
+			{ startIndex: 2, type: 'number.scala' }
+		]
+	}],
+
+	[{
+		line: '100+10',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 3, type: 'delimiter.scala' },
+			{ startIndex: 4, type: 'number.scala' }
+		]
+	}],
+
+	[{
+		line: '0 + 0',
+		tokens: [
+			{ startIndex: 0, type: 'number.scala' },
+			{ startIndex: 1, type: '' },
+			{ startIndex: 2, type: 'delimiter.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'number.scala' }
+		]
+	}],
+
+	// single line Strings
+	[{
+		line: 'val s: String = "I\'m a Scala String";',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.val.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'identifier.scala' },
+			{ startIndex: 5, type: 'delimiter.scala' },
+			{ startIndex: 6, type: '' },
+			{ startIndex: 7, type: 'identifier.scala' },
+			{ startIndex: 13, type: '' },
+			{ startIndex: 14, type: 'delimiter.scala' },
+			{ startIndex: 15, type: '' },
+			{ startIndex: 16, type: 'string.scala' },
+			{ startIndex: 36, type: 'delimiter.scala' }
+		]
+	}],
+
+	[{
+		line: 'val s: String = "concatenated" + " String" ;',
+		tokens: [
+			{ startIndex: 0, type: 'keyword.val.scala' },
+			{ startIndex: 3, type: '' },
+			{ startIndex: 4, type: 'identifier.scala' },
+			{ startIndex: 5, type: 'delimiter.scala' },
+			{ startIndex: 6, type: '' },
+			{ startIndex: 7, type: 'identifier.scala' },
+			{ startIndex: 13, type: '' },
+			{ startIndex: 14, type: 'delimiter.scala' },
+			{ startIndex: 15, type: '' },
+			{ startIndex: 16, type: 'string.scala' },
+			{ startIndex: 30, type: '' },
+			{ startIndex: 31, type: 'delimiter.scala' },
+			{ startIndex: 32, type: '' },
+			{ startIndex: 33, type: 'string.scala' },
+			{ startIndex: 42, type: '' },
+			{ startIndex: 43, type: 'delimiter.scala' }
+		]
+	}],
+
+	[{
+		line: '"quote in a string"',
+		tokens: [
+			{ startIndex: 0, type: 'string.scala' }
+		]
+	}],
+
+	[{
+		line: '"escaping \\"quotes\\" is cool"',
+		tokens: [
+			{ startIndex: 0, type: 'string.scala' },
+			{ startIndex: 10, type: 'string.escape.scala' },
+			{ startIndex: 12, type: 'string.scala' },
+			{ startIndex: 18, type: 'string.escape.scala' },
+			{ startIndex: 20, type: 'string.scala' }
+		]
+	}],
+
+	[{
+		line: '"\\"',
+		tokens: [
+			{ startIndex: 0, type: 'string.invalid.scala' }
+		]
+	}],
+
+	// Annotations
+	[{
+		line: '@',
+		tokens: [
+			{ startIndex: 0, type: '' }
+		]
+	}],
+
+	[{
+		line: '@uncheckedStable',
+		tokens: [
+			{ startIndex: 0, type: 'annotation.scala' }
+		]
+	}],
+
+	[{
+		line: '@silent("deprecated")',
+		tokens: [
+			{ startIndex: 0, type: 'annotation.scala' },
+			{ startIndex: 7, type: 'delimiter.parenthesis.scala' },
+			{ startIndex: 8, type: 'string.scala' },
+			{ startIndex: 20, type: 'delimiter.parenthesis.scala' }
+		]
+	}],
+
+	[{
+		line: '@ AnnotationWithKeywordAfter private',
+		tokens: [
+			{ startIndex: 0, type: 'annotation.scala' },
+			{ startIndex: 28, type: '' },
+			{ startIndex: 29, type: 'keyword.private.scala' }
+		]
+	}]
+]);
+

src/scala/scala.ts

@@ -0,0 +1,153 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import IRichLanguageConfiguration = monaco.languages.LanguageConfiguration;
+import ILanguage = monaco.languages.IMonarchLanguage;
+
+export const conf: IRichLanguageConfiguration = {
+	// the default separators except `@$`
+	wordPattern: /(-?\d*\.\d\w*)|([^\`\~\!\#\%\^\&\*\(\)\-\=\+\[\{\]\}\\\|\;\:\'\"\,\.\<\>\/\?\s]+)/g,
+	comments: {
+		lineComment: '//',
+		blockComment: ['/*', '*/'],
+	},
+	brackets: [
+		['{', '}'],
+		['[', ']'],
+		['(', ')'],
+	],
+	autoClosingPairs: [
+		{ open: '{', close: '}' },
+		{ open: '[', close: ']' },
+		{ open: '(', close: ')' },
+		{ open: '"', close: '"' },
+		{ open: '\'', close: '\'' },
+	],
+	surroundingPairs: [
+		{ open: '{', close: '}' },
+		{ open: '[', close: ']' },
+		{ open: '(', close: ')' },
+		{ open: '"', close: '"' },
+		{ open: '\'', close: '\'' },
+		{ open: '<', close: '>' },
+	]
+};
+
+export const language = <ILanguage>{
+	defaultToken: '',
+	tokenPostfix: '.scala',
+
+	// Reserved words are defined in lexical syntax at:
+	// https://www.scala-lang.org/files/archive/spec/2.13/01-lexical-syntax.html
+	keywords: [
+		'abstract', 'case', 'catch', 'class', 'def',
+		'do', 'else', 'extends', 'false', 'final',
+		'finally', 'for', 'forSome', 'if', 'implicit',
+		'import', 'lazy', 'macro', 'match', 'new',
+		'null', 'object', 'override', 'package', 'private',
+		'protected', 'return', 'sealed', 'super', 'this',
+		'throw', 'trait', 'try', 'true', 'type',
+		'val', 'var', 'while', 'with', 'yield',
+		'Double', 'Float', 'Long', 'Int', 'Short',
+		'Byte', 'Char', 'Unit', 'Boolean'
+	],
+
+	// Extended the operators that are defined in lexical syntax at:
+	// https://www.scala-lang.org/files/archive/spec/2.13/01-lexical-syntax.html
+	operators: [
+		'=', '>', '<', '!', '~', '?', ':',
+		'==', '<=', '>=', '!=', '&&', '||', '++', '--',
+		'+', '-', '*', '/', '&', '|', '^', '%', '<<',
+		'>>', '>>>', '+=', '-=', '*=', '/=', '&=', '|=',
+		'^=', '%=', '<<=', '>>=', '>>>=',
+		'_', '=>', '<-', '<:', '<%', '>:', '#', '@'
+	],
+
+	// we include these common regular expressions
+	symbols: /[=><!~?:&|+\-*\/\^%]+/,
+	escapes: /\\(?:[abfnrtv\\"']|x[0-9A-Fa-f]{1,4}|u[0-9A-Fa-f]{4}|U[0-9A-Fa-f]{8})/,
+	digits: /\d+(_+\d+)*/,
+	hexdigits: /[[0-9a-fA-F]+(_+[0-9a-fA-F]+)*/,
+
+	// The main tokenizer for our languages
+	tokenizer: {
+		root: [
+			// identifiers and keywords
+			[/[a-zA-Z_$][\w$]*/, {
+				cases: {
+					'@keywords': { token: 'keyword.$0' },
+					'@default': 'identifier'
+				}
+			}],
+
+			// whitespace
+			{ include: '@whitespace' },
+
+			// delimiters and operators
+			[/[{}()\[\]]/, '@brackets'],
+			[/[<>](?!@symbols)/, '@brackets'],
+			[/@symbols/, {
+				cases: {
+					'@operators': 'delimiter',
+					'@default': ''
+				}
+			}],
+
+			// @ annotations.
+			[/@\s*[a-zA-Z_\$][\w\$]*/, 'annotation'],
+
+			// numbers
+			[/(@digits)[eE]([\-+]?(@digits))?[fFdD]?/, 'number.float'],
+			[/(@digits)\.(@digits)([eE][\-+]?(@digits))?[fFdD]?/, 'number.float'],
+			[/0[xX](@hexdigits)[Ll]?/, 'number.hex'],
+			[/(@digits)[fFdD]/, 'number.float'],
+			[/(@digits)[lL]?/, 'number'],
+
+			// delimiter: after number because of .\d floats
+			[/[;,.]/, 'delimiter'],
+
+			// strings
+			[/"([^"\\]|\\.)*$/, 'string.invalid'],  // non-terminated string
+			[/"/, 'string', '@string'],
+
+			// characters
+			[/'[^\\']'/, 'string'],
+			[/(')(@escapes)(')/, ['string', 'string.escape', 'string']],
+			[/'/, 'string.invalid']
+		],
+
+		whitespace: [
+			[/[ \t\r\n]+/, ''],
+			[/\/\*\*(?!\/)/, 'comment.doc', '@scaladoc'],
+			[/\/\*/, 'comment', '@comment'],
+			[/\/\/.*$/, 'comment'],
+		],
+
+		comment: [
+			[/[^\/*]+/, 'comment'],
+			// [/\/\*/, 'comment', '@push' ],    // nested comment not allowed :-(
+			// [/\/\*/,    'comment.invalid' ],    // this breaks block comments in the shape of /* //*/
+			[/\*\//, 'comment', '@pop'],
+			[/[\/*]/, 'comment']
+		],
+		//Identical copy of comment above, except for the addition of .doc
+		scaladoc: [
+			[/[^\/*]+/, 'comment.doc'],
+			// [/\/\*/, 'comment.doc', '@push' ],    // nested comment not allowed :-(
+			[/\/\*/, 'comment.doc.invalid'],
+			[/\*\//, 'comment.doc', '@pop'],
+			[/[\/*]/, 'comment.doc']
+		],
+
+		string: [
+			[/[^\\"]+/, 'string'],
+			[/@escapes/, 'string.escape'],
+			[/\\./, 'string.escape.invalid'],
+			[/"/, 'string', '@pop']
+		],
+	},
+};