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

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-- Language definition generated by lang2to3

Description="Squirrel"

Keywords={
  { Id=1,
    List={"break", "catch", "clone", "continue", "case", "delegate", "delete", 
	"default", "do", "else", "local", "for", "function", "foreach", "if", "in",
	"long", "null", "return", "resume", "switch", "this", "throw", "try", "typeof", "while", "yield"},
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]],
  },
}

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

IgnoreCase=false

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

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