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/*
Language: Rust
Author: Andrey Vlasovskikh <andrey.vlasovskikh@gmail.com>
Contributors: Roman Shmatov <romanshmatov@gmail.com>, Kasper Andersen <kma_untrusted@protonmail.com>
Website: https://www.rust-lang.org
Category: common, system
*/

export default function(hljs) {
  var NUM_SUFFIX = '([ui](8|16|32|64|128|size)|f(32|64))\?';
  var KEYWORDS =
    'abstract as async await become box break const continue crate do dyn ' +
    'else enum extern false final fn for if impl in let loop macro match mod ' +
    'move mut override priv pub ref return self Self static struct super ' +
    'trait true try type typeof unsafe unsized use virtual where while yield';
  var BUILTINS =
    // functions
    'drop ' +
    // types
    'i8 i16 i32 i64 i128 isize ' +
    'u8 u16 u32 u64 u128 usize ' +
    'f32 f64 ' +
    'str char bool ' +
    'Box Option Result String Vec ' +
    // traits
    'Copy Send Sized Sync Drop Fn FnMut FnOnce ToOwned Clone Debug ' +
    'PartialEq PartialOrd Eq Ord AsRef AsMut Into From Default Iterator ' +
    'Extend IntoIterator DoubleEndedIterator ExactSizeIterator ' +
    'SliceConcatExt ToString ' +
    // macros
    'assert! assert_eq! bitflags! bytes! cfg! col! concat! concat_idents! ' +
    'debug_assert! debug_assert_eq! env! panic! file! format! format_args! ' +
    'include_bin! include_str! line! local_data_key! module_path! ' +
    'option_env! print! println! select! stringify! try! unimplemented! ' +
    'unreachable! vec! write! writeln! macro_rules! assert_ne! debug_assert_ne!';
  return {
    name: 'Rust',
    aliases: ['rs'],
    keywords: {
      $pattern: hljs.IDENT_RE + '!?',
      keyword:
        KEYWORDS,
      literal:
        'true false Some None Ok Err',
      built_in:
        BUILTINS
    },
    illegal: '</',
    contains: [
      hljs.C_LINE_COMMENT_MODE,
      hljs.COMMENT('/\\*', '\\*/', {contains: ['self']}),
      hljs.inherit(hljs.QUOTE_STRING_MODE, {begin: /b?"/, illegal: null}),
      {
        className: 'string',
        variants: [
           { begin: /r(#*)"(.|\n)*?"\1(?!#)/ },
           { begin: /b?'\\?(x\w{2}|u\w{4}|U\w{8}|.)'/ }
        ]
      },
      {
        className: 'symbol',
        begin: /'[a-zA-Z_][a-zA-Z0-9_]*/
      },
      {
        className: 'number',
        variants: [
          { begin: '\\b0b([01_]+)' + NUM_SUFFIX },
          { begin: '\\b0o([0-7_]+)' + NUM_SUFFIX },
          { begin: '\\b0x([A-Fa-f0-9_]+)' + NUM_SUFFIX },
          { begin: '\\b(\\d[\\d_]*(\\.[0-9_]+)?([eE][+-]?[0-9_]+)?)' +
                   NUM_SUFFIX
          }
        ],
        relevance: 0
      },
      {
        className: 'function',
        beginKeywords: 'fn', end: '(\\(|<)', excludeEnd: true,
        contains: [hljs.UNDERSCORE_TITLE_MODE]
      },
      {
        className: 'meta',
        begin: '#\\!?\\[', end: '\\]',
        contains: [
          {
            className: 'meta-string',
            begin: /"/, end: /"/
          }
        ]
      },
      {
        className: 'class',
        beginKeywords: 'type', end: ';',
        contains: [
          hljs.inherit(hljs.UNDERSCORE_TITLE_MODE, {endsParent: true})
        ],
        illegal: '\\S'
      },
      {
        className: 'class',
        beginKeywords: 'trait enum struct union', end: '{',
        contains: [
          hljs.inherit(hljs.UNDERSCORE_TITLE_MODE, {endsParent: true})
        ],
        illegal: '[\\w\\d]'
      },
      {
        begin: hljs.IDENT_RE + '::',
        keywords: {built_in: BUILTINS}
      },
      {
        begin: '->'
      }
    ]
  };
}