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/usr/share/highlight/langDefs/ceylon.lang is in highlight-common 3.18-3.

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Description="Ceylon"

Keywords={
  {  Id=1,
   List={ "import", "class", "interface", "object", "given", "value", "assign", "void", "function", "of", "extends", "satisfies", "adapts",
	  "abstracts", "in", "out", "return", "break", "continue", "throw", "if", "else", "switch", "case", "for", "while", "try", "catch",
	  "finally", "then", "this", "outer", "super", "is", "exists", "nonempty"
        }
  },
  { Id=2,
    List= {
          }
  },
  { Id=3,
    List= { 
          }
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]]
  }
}

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

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

IgnoreCase=false

PreProcessor = {
  Prefix=[[#]],
  Continuation="\\",
}

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

Digits=[[ [\d\.\_]*\d+(?:[eE][\-\+]?\d+)?[kMGTPmunpf]* ]]


EnableIndentation=true