/*
Language: Delphi
Website: https://www.embarcadero.com/products/delphi
*/

export default function(hljs) {
  var KEYWORDS =
    'exports register file shl array record property for mod while set ally label uses raise not ' +
    'stored class safecall var interface or private static exit index inherited to else stdcall ' +
    'override shr asm far resourcestring finalization packed virtual out and protected library do ' +
    'xorwrite goto near function end div overload object unit begin string on inline repeat until ' +
    'destructor write message program with read initialization except default nil if case cdecl in ' +
    'downto threadvar of try pascal const external constructor type public then implementation ' +
    'finally published procedure absolute reintroduce operator as is abstract alias assembler ' +
    'bitpacked break continue cppdecl cvar enumerator experimental platform deprecated ' +
    'unimplemented dynamic export far16 forward generic helper implements interrupt iochecks ' +
    'local name nodefault noreturn nostackframe oldfpccall otherwise saveregisters softfloat ' +
    'specialize strict unaligned varargs ';
  var COMMENT_MODES = [
    hljs.C_LINE_COMMENT_MODE,
    hljs.COMMENT(/\{/, /\}/, {relevance: 0}),
    hljs.COMMENT(/\(\*/, /\*\)/, {relevance: 10})
  ];
  var DIRECTIVE = {
    className: 'meta',
    variants: [
      {begin: /\{\$/, end: /\}/},
      {begin: /\(\*\$/, end: /\*\)/}
    ]
  };
  var STRING = {
    className: 'string',
    begin: /'/, end: /'/,
    contains: [{begin: /''/}]
  };
  var NUMBER = {
    className: 'number',
    relevance: 0,
    // Source: https://www.freepascal.org/docs-html/ref/refse6.html
    variants: [
      {
        // Hexadecimal notation, e.g., $7F.
        begin: '\\$[0-9A-Fa-f]+',
      },
      {
        // Octal notation, e.g., &42.
        begin: '&[0-7]+',
      },
      {
        // Binary notation, e.g., %1010.
        begin: '%[01]+',
      }
    ]
  };
  var CHAR_STRING = {
    className: 'string', begin: /(#\d+)+/
  };
  var CLASS = {
    begin: hljs.IDENT_RE + '\\s*=\\s*class\\s*\\(', returnBegin: true,
    contains: [
      hljs.TITLE_MODE
    ]
  };
  var FUNCTION = {
    className: 'function',
    beginKeywords: 'function constructor destructor procedure', end: /[:;]/,
    keywords: 'function constructor|10 destructor|10 procedure|10',
    contains: [
      hljs.TITLE_MODE,
      {
        className: 'params',
        begin: /\(/, end: /\)/,
        keywords: KEYWORDS,
        contains: [STRING, CHAR_STRING, DIRECTIVE].concat(COMMENT_MODES)
      },
      DIRECTIVE
    ].concat(COMMENT_MODES)
  };
  return {
    name: 'Delphi',
    aliases: ['dpr', 'dfm', 'pas', 'pascal', 'freepascal', 'lazarus', 'lpr', 'lfm'],
    case_insensitive: true,
    keywords: KEYWORDS,
    illegal: /"|\$[G-Zg-z]|\/\*|<\/|\|/,
    contains: [
      STRING, CHAR_STRING,
      hljs.NUMBER_MODE,
      NUMBER,
      CLASS,
      FUNCTION,
      DIRECTIVE
    ].concat(COMMENT_MODES)
  };
}
