/*---------------------------------------------------------------------------------------------
 *  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 {ILanguage} from './types';

export var language = <ILanguage> {
	displayName:    'F#',
	name:           'fs',
	defaultToken: '',

	lineComment:      '//',
	blockCommentStart: '(*',
	blockCommentEnd: '*)',

	autoClosingPairs: [ ['{', '}'], ['[', ']'], ['(',  ')'], ['"',  '"']], // Skip < > which would be there by default.

	keywords: [
		'abstract', 'and', 'atomic', 'as',
		'assert', 'asr', 'base', 'begin',
		'break', 'checked', 'component',
		'const', 'constraint', 'constructor',
		'continue', 'class', 'default',
		'delegate','do', 'done', 'downcast',
		'downto', 'elif', 'else', 'end',
		'exception', 'eager', 'event', 'external',
		'extern',	'false', 'finally',	'for',
		'fun',	'function', 'fixed', 'functor',
		'global', 'if', 'in', 'include', 'inherit',
		'inline', 'interface', 'internal', 'land',
		'lor', 'lsl','lsr', 'lxor', 'lazy', 'let',
		'match', 'member','mod','module', 'mutable',
		'namespace', 'method', 'mixin', 'new', 'not',
		'null', 'of', 'open', 'or', 'object',
		'override', 'private', 'parallel', 'process',
		'protected', 'pure', 'public', 'rec', 'return',
		'static', 'sealed', 'struct', 'sig', 'then',
		'to', 'true', 'tailcall', 'trait',
		'try', 'type', 'upcast', 'use',
		'val', 'void', 'virtual', 'volatile',
		'when', 'while','with', 'yield'
	],

	// 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})/,
	integersuffix: /[uU]?[yslnLI]?/,
	floatsuffix: /[fFmM]?/,

	// 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' },

			// [< attributes >].
			[/\[<.*>\]/, 'annotation'],

			// Preprocessor directive
			[/^#(if|else|endif)/, 'keyword'],

			// delimiters and operators
			[/[{}()\[\]]/, '@brackets'],
			[/[<>](?!@symbols)/, '@brackets'],
			[/@symbols/, 'delimiter' ],

			// numbers
			[/\d*\d+[eE]([\-+]?\d+)?(@floatsuffix)/, 'number.float'],
			[/\d*\.\d+([eE][\-+]?\d+)?(@floatsuffix)/, 'number.float'],
			[/0x[0-9a-fA-F]+LF/, 'number.float'],
			[/0x[0-9a-fA-F]+(@integersuffix)/, 'number.hex'],
			[/0b[0-1]+(@integersuffix)/, 'number.bin'],
			[/\d+(@integersuffix)/, 'number'],

			// delimiter: after number because of .\d floats
			[/[;,.]/, 'delimiter'],

			// strings
			[/"([^"\\]|\\.)*$/, 'string.invalid' ],  // non-teminated string
			[/"""/, 'string', '@string."""'],
			[/"/, 'string', '@string."' ],

			// literal string
			[/\@"/, { token: 'string.quote', bracket: '@open', next: '@litstring' }],

			// characters
			[/'[^\\']'B?/, 'string'],
			[/(')(@escapes)(')/, ['string','string.escape','string']],
			[/'/, 'string.invalid']
		],

		whitespace: [
			[/[ \t\r\n]+/, ''],
			[/\(\*/,       		'comment', '@comment' ],
			[/\/\/.*$/,    		'comment'],
		],

		comment: [
			[/[^\*]+/, 'comment' ],
			[/\*\)/,    'comment', '@pop'  ],
			[/\*/,   'comment' ]
		],

		string: [
			[/[^\\"]+/, 'string'],
			[/@escapes/, 'string.escape'],
			[/\\./,      'string.escape.invalid'],
			[/("""|"B?)/,     { cases: { '$#==$S2' : { token: 'string', next: '@pop' },
									'@default': 'string' }} ]
		],

		litstring: [
			[/[^"]+/,    'string'],
			[/""/,       'string.escape'],
			[/"/,        { token: 'string.quote', bracket: '@close', next: '@pop' } ]
		],
	},
};