/*---------------------------------------------------------------------------------------------
 *  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:    'Go',
	name:           'go',
	defaultToken: '',

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

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

	keywords: [
		'break',
		'case',
		'chan',
		'const',
		'continue',
		'default',
		'defer',
		'else',
		'fallthrough',
		'for',
		'func',
		'go',
		'goto',
		'if',
		'import',
		'interface',
		'map',
		'package',
		'range',
		'return',
		'select',
		'struct',
		'switch',
		'type',
		'var',
		'bool',
		'true',
		'false',
		'uint8',
		'uint16',
		'uint32',
		'uint64',
		'int8',
		'int16',
		'int32',
		'int64',
		'float32',
		'float64',
		'complex64',
		'complex128',
		'byte',
		'rune',
		'uint',
		'int',
		'uintptr',
		'string',
		'nil',
	],

	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})/,


	// 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
			[/^\s*#\w+/, 'keyword'],

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

			// numbers
			[/\d*\d+[eE]([\-+]?\d+)?/, 'number.float'],
			[/\d*\.\d+([eE][\-+]?\d+)?/, 'number.float'],
			[/0[xX][0-9a-fA-F']*[0-9a-fA-F]/, 'number.hex'],
			[/0[0-7']*[0-7]/, 'number.octal'],
			[/0[bB][0-1']*[0-1]/, 'number.binary'],
			[/\d[\d']*/, 'number'],
			[/\d/, 'number'],

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

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

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

		whitespace: [
			[/[ \t\r\n]+/, ''],
			[/\/\*\*(?!\/)/,  'comment.doc', '@doccomment' ],
			[/\/\*/,       		'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
		doccomment: [
			[/[^\/*]+/, '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' ]
		],
	},
};