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/usr/share/highlight/langDefs/os.lang is in highlight-common 3.9-1+deb7u1.

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-- Language definition generated by lang2to3

Description="Object Script"

Keywords={
  { Id=1,
    List={"new", "instanceof", "castToBoolean", "castToString", "castToExactNumber", "castToInexactNumber", "var", "writeln", "if", "while", "for", "break", "continue", "try", "catch", "finally", "throw", "synchronized", "const", "public", "function", "extends", "return", "eval", "this", "true", "false", "null", "import", "write"},
  },
  { Id=2,
    List={"Object", "ExactNumber", "String", "Exception", "Thread"},
  },
}

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

IgnoreCase=false

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

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