/*
Language: D
Author: Aleksandar Ruzicic <aleksandar@ruzicic.info>
Description: D is a language with C-like syntax and static typing. It pragmatically combines efficiency, control, and modeling power, with safety and programmer productivity.
Version: 1.0a
Date: 2012-04-08
*/

/**
 * Known issues:
 *
 * - invalid hex string literals will be recognized as a double quoted strings
 *   but 'x' at the beginning of string will not be matched
 *
 * - delimited string literals are not checked for matching end delimiter
 *   (not possible to do with js regexp)
 *
 * - content of token string is colored as a string (i.e. no keyword coloring inside a token string)
 *   also, content of token string is not validated to contain only valid D tokens
 *
 * - special token sequence rule is not strictly following D grammar (anything following #line
 *   up to the end of line is matched as special token sequence)
 */

import { KeywordsDef, LanguageDef } from '../types';
import {
    COMMENT,
    UNDERSCORE_IDENT_RE,
    C_LINE_COMMENT_MODE,
    C_BLOCK_COMMENT_MODE
} from '../common';

/**
 * Language keywords
 *
 * @type {Object}
 */
const D_KEYWORDS: KeywordsDef = {
    keyword:
        'abstract alias align asm assert auto body break byte case cast catch class ' +
        'const continue debug default delete deprecated do else enum export extern final ' +
        'finally for foreach foreach_reverse|10 goto if immutable import in inout int ' +
        'interface invariant is lazy macro mixin module new nothrow out override package ' +
        'pragma private protected public pure ref return scope shared static struct ' +
        'super switch synchronized template this throw try typedef typeid typeof union ' +
        'unittest version void volatile while with __FILE__ __LINE__ __gshared|10 ' +
        '__thread __traits __DATE__ __EOF__ __TIME__ __TIMESTAMP__ __VENDOR__ __VERSION__',
    built_in:
        'bool cdouble cent cfloat char creal dchar delegate double dstring float function ' +
        'idouble ifloat ireal long real short string ubyte ucent uint ulong ushort wchar ' +
        'wstring',
    literal:
        'false null true'
};

/**
 * Number literal regexps
 *
 * @type {String}
 */
const decimal_integer_re = '(0|[1-9][\\d_]*)',
    decimal_integer_nosus_re = '(0|[1-9][\\d_]*|\\d[\\d_]*|[\\d_]+?\\d)',
    binary_integer_re = '0[bB][01_]+',
    hexadecimal_digits_re = '([\\da-fA-F][\\da-fA-F_]*|_[\\da-fA-F][\\da-fA-F_]*)',
    hexadecimal_integer_re = '0[xX]' + hexadecimal_digits_re,

    decimal_exponent_re = '([eE][+-]?' + decimal_integer_nosus_re + ')',
    decimal_float_re = '(' + decimal_integer_nosus_re + '(\\.\\d*|' + decimal_exponent_re + ')|' +
        '\\d+\\.' + decimal_integer_nosus_re + decimal_integer_nosus_re + '|' +
        '\\.' + decimal_integer_re + decimal_exponent_re + '?' +
        ')',
    hexadecimal_float_re = '(0[xX](' +
        hexadecimal_digits_re + '\\.' + hexadecimal_digits_re + '|' +
        '\\.?' + hexadecimal_digits_re +
        ')[pP][+-]?' + decimal_integer_nosus_re + ')',

    integer_re = '(' +
        decimal_integer_re + '|' +
        binary_integer_re + '|' +
        hexadecimal_integer_re +
        ')',

    float_re = '(' +
        hexadecimal_float_re + '|' +
        decimal_float_re +
        ')';

/**
 * Escape sequence supported in D string and character literals
 *
 * @type {String}
 */
const escape_sequence_re = '\\\\(' +
    '[\'"\\?\\\\abfnrtv]|' +  // common escapes
    'u[\\dA-Fa-f]{4}|' +     // four hex digit unicode codepoint
    '[0-7]{1,3}|' +       // one to three octal digit ascii char code
    'x[\\dA-Fa-f]{2}|' +    // two hex digit ascii char code
    'U[\\dA-Fa-f]{8}' +      // eight hex digit unicode codepoint
    ')|' +
    '&[a-zA-Z\\d]{2,};';      // named character entity

/**
 * D integer number literals
 *
 * @type {Object}
 */
const D_INTEGER_MODE = {
    className: 'number',
    begin: '\\b' + integer_re + '(L|u|U|Lu|LU|uL|UL)?',
    relevance: 0
};

/**
 * [D_FLOAT_MODE description]
 * @type {Object}
 */
const D_FLOAT_MODE = {
    className: 'number',
    begin: '\\b(' +
        float_re + '([fF]|L|i|[fF]i|Li)?|' +
        integer_re + '(i|[fF]i|Li)' +
        ')',
    relevance: 0
};

/**
 * D character literal
 *
 * @type {Object}
 */
const D_CHARACTER_MODE = {
    className: 'string',
    begin: '\'(' + escape_sequence_re + '|.)', end: '\'',
    illegal: '.'
};

/**
 * D string escape sequence
 *
 * @type {Object}
 */
const D_ESCAPE_SEQUENCE = {
    begin: escape_sequence_re,
    relevance: 0
};

/**
 * D double quoted string literal
 *
 * @type {Object}
 */
const D_STRING_MODE = {
    className: 'string',
    begin: '"',
    contains: [D_ESCAPE_SEQUENCE],
    end: '"[cwd]?'
};

/**
 * D wysiwyg and delimited string literals
 *
 * @type {Object}
 */
const D_WYSIWYG_DELIMITED_STRING_MODE = {
    className: 'string',
    begin: '[rq]"',
    end: '"[cwd]?',
    relevance: 5
};

/**
 * D alternate wysiwyg string literal
 *
 * @type {Object}
 */
const D_ALTERNATE_WYSIWYG_STRING_MODE = {
    className: 'string',
    begin: '`',
    end: '`[cwd]?'
};

/**
 * D hexadecimal string literal
 *
 * @type {Object}
 */
const D_HEX_STRING_MODE = {
    className: 'string',
    begin: 'x"[\\da-fA-F\\s\\n\\r]*"[cwd]?',
    relevance: 10
};

/**
 * D delimited string literal
 *
 * @type {Object}
 */
const D_TOKEN_STRING_MODE = {
    className: 'string',
    begin: 'q"\\{',
    end: '\\}"'
};

/**
 * Hashbang support
 *
 * @type {Object}
 */
const D_HASHBANG_MODE = {
    className: 'meta',
    begin: '^#!',
    end: '$',
    relevance: 5
};

/**
 * D special token sequence
 *
 * @type {Object}
 */
const D_SPECIAL_TOKEN_SEQUENCE_MODE = {
    className: 'meta',
    begin: '#(line)',
    end: '$',
    relevance: 5
};

/**
 * D attributes
 *
 * @type {Object}
 */
const D_ATTRIBUTE_MODE = {
    className: 'keyword',
    begin: '@[a-zA-Z_][a-zA-Z_\\d]*'
};

/**
 * D nesting comment
 *
 * @type {Object}
 */
const D_NESTING_COMMENT_MODE = COMMENT(
    '\\/\\+',
    '\\+\\/',
    {
        contains: ['self'],
        relevance: 10
    }
);

export const D: LanguageDef = {
    name: 'd',
    aliases: ['clang'],
    lexemes: UNDERSCORE_IDENT_RE,
    keywords: D_KEYWORDS,
    contains: [
        C_LINE_COMMENT_MODE,
        C_BLOCK_COMMENT_MODE,
        D_NESTING_COMMENT_MODE,
        D_HEX_STRING_MODE,
        D_STRING_MODE,
        D_WYSIWYG_DELIMITED_STRING_MODE,
        D_ALTERNATE_WYSIWYG_STRING_MODE,
        D_TOKEN_STRING_MODE,
        D_FLOAT_MODE,
        D_INTEGER_MODE,
        D_CHARACTER_MODE,
        D_HASHBANG_MODE,
        D_SPECIAL_TOKEN_SEQUENCE_MODE,
        D_ATTRIBUTE_MODE
    ]
};