module.exports = function(hljs) {
  var CPP_PRIMATIVE_TYPES = {
    className: 'keyword',
    begin: '\\b[a-z\\d_]*_t\\b'
  };

  var STRINGS = {
    className: 'string',
    variants: [
      hljs.inherit(hljs.QUOTE_STRING_MODE, { begin: '((u8?|U)|L)?"' }),
      {
        begin: '(u8?|U)?R"', end: '"',
        contains: [hljs.BACKSLASH_ESCAPE]
      },
      {
        begin: '\'\\\\?.', end: '\'',
        illegal: '.'
      }
    ]
  };

  var NUMBERS = {
    className: 'number',
    variants: [
      { begin: '\\b(\\d+(\\.\\d*)?|\\.\\d+)(u|U|l|L|ul|UL|f|F)' },
      { begin: hljs.C_NUMBER_RE }
    ]
  };

  var FUNCTION_TITLE = hljs.IDENT_RE + '\\s*\\(';

  var CPP_KEYWORDS = {
    keyword: 'int float while private char catch export virtual operator sizeof ' +
      'dynamic_cast|10 typedef const_cast|10 const struct for static_cast|10 union namespace ' +
      'unsigned long volatile static protected bool template mutable if public friend ' +
      'do goto auto void enum else break extern using class asm case typeid ' +
      'short reinterpret_cast|10 default double register explicit signed typename try this ' +
      'switch continue inline delete alignof constexpr decltype ' +
      'noexcept static_assert thread_local restrict _Bool complex _Complex _Imaginary ' +
      'atomic_bool atomic_char atomic_schar ' +
      'atomic_uchar atomic_short atomic_ushort atomic_int atomic_uint atomic_long atomic_ulong atomic_llong ' +
      'atomic_ullong',
    built_in: 'std string cin cout cerr clog stdin stdout stderr stringstream istringstream ostringstream ' +
      'auto_ptr deque list queue stack vector map set bitset multiset multimap unordered_set ' +
      'unordered_map unordered_multiset unordered_multimap array shared_ptr abort abs acos ' +
      'asin atan2 atan calloc ceil cosh cos exit exp fabs floor fmod fprintf fputs free frexp ' +
      'fscanf isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper ' +
      'isxdigit tolower toupper labs ldexp log10 log malloc realloc memchr memcmp memcpy memset modf pow ' +
      'printf putchar puts scanf sinh sin snprintf sprintf sqrt sscanf strcat strchr strcmp ' +
      'strcpy strcspn strlen strncat strncmp strncpy strpbrk strrchr strspn strstr tanh tan ' +
      'vfprintf vprintf vsprintf',
    literal: 'true false nullptr NULL'
  };
  return {
    aliases: ['c', 'cc', 'h', 'c++', 'h++', 'hpp'],
    keywords: CPP_KEYWORDS,
    illegal: '</',
    contains: [
      CPP_PRIMATIVE_TYPES,
      hljs.C_LINE_COMMENT_MODE,
      hljs.C_BLOCK_COMMENT_MODE,
      NUMBERS,
      STRINGS,
      {
        className: 'preprocessor',
        begin: '#', end: '$',
        keywords: 'if else elif endif define undef warning error line ' +
                  'pragma ifdef ifndef',
        contains: [
          {
            begin: /\\\n/, relevance: 0
          },
          {
            beginKeywords: 'include', end: '$',
            contains: [
              STRINGS,
              {
                className: 'string',
                begin: '<', end: '>',
                illegal: '\\n',
              }
            ]
          },
          STRINGS,
          NUMBERS,
          hljs.C_LINE_COMMENT_MODE,
          hljs.C_BLOCK_COMMENT_MODE,
        ]
      },
      {
        begin: '\\b(deque|list|queue|stack|vector|map|set|bitset|multiset|multimap|unordered_map|unordered_set|unordered_multiset|unordered_multimap|array)\\s*<', end: '>',
        keywords: CPP_KEYWORDS,
        contains: ['self', CPP_PRIMATIVE_TYPES]
      },
      {
        begin: hljs.IDENT_RE + '::',
        keywords: CPP_KEYWORDS
      },
      {
        // Expression keywords prevent 'keyword Name(...) or else if(...)' from
        // being recognized as a function definition
        beginKeywords: 'new throw return else',
        relevance: 0
      },
      {
        className: 'function',
        begin: '(' + hljs.IDENT_RE + '[\\*&\\s]+)+' + FUNCTION_TITLE,
        returnBegin: true, end: /[{;=]/,
        excludeEnd: true,
        keywords: CPP_KEYWORDS,
        contains: [
          {
            begin: FUNCTION_TITLE, returnBegin: true,
            contains: [hljs.TITLE_MODE],
            relevance: 0
          },
          {
            className: 'params',
            begin: /\(/, end: /\)/,
            keywords: CPP_KEYWORDS,
            relevance: 0,
            contains: [
              hljs.C_LINE_COMMENT_MODE,
              hljs.C_BLOCK_COMMENT_MODE,
              STRINGS,
              NUMBERS
            ]
          },
          hljs.C_LINE_COMMENT_MODE,
          hljs.C_BLOCK_COMMENT_MODE
        ]
      }
    ]
  };
};