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/usr/share/highlight/langDefs/objc.lang is in highlight-common 3.41-1.

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The actual contents of the file can be viewed below.

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Description="Objective C"

Keywords={
  { Id=1,
    List={"goto", "break", "return", "continue", "asm", "case", "default", "if", 
        "else", "switch", "while", "for", "do", "sizeof", "typeof", "typedef", "inline", 
        "stdcall", "auto", "cdecl", "class", "const_cast", "delete", "dynamic_cast", 
        "explicit", "extern", "friend", "goto", "inline", "mutable", "namespace", "new", 
        "operator", "pascal", "register", "reinterpret_cast", "private", "protected", 
        "public", "static_cast", "template", "this", "throw", "try", "catch", "typeid", 
        "using", "virtual", "volatile", "true", "false", "id", "Class", "SEL", "IMP", 
        "BOOL", "oneway", "in", "out", "inout", "bycopy", "byref", "self", "super", 
        "nil", "NIL", "TRUE", "FALSE"},
  },
  { Id=2,
    List={"int", "long", "short", "char", "void", "signed", "unsigned", "float", 
        "double", "size_t", "wchar_t", "ptrdiff_t", "sig_atomic_t", "fpos_t", "clock_t", 
        "time_t", "va_list", "jmp_buf", "FILE", "DIR", "div_t", "ldiv_t", "static", 
        "register", "auto", "volatile", "extern", "const", "bool", "struct", "union", 
        "enum"},
  },
  { Id=3,
    Regex=[[@\w+]],
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]],
  },
}

Strings={
  Delimiter=[["|']],
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[\/\/]] },
  },
  { Block=true,
    Nested=false,
    Delimiter= { [[\/\*]],[[\*\/]],}
  }
}

PreProcessor={
  Prefix=[[#]],
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|<|>|\!|\=|\/|\*|\%|\+|\-]]