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

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The actual contents of the file can be viewed below.

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-- Language definition generated by lang2to3

Description="Eiffel"

Keywords={
  { Id=1,
    List={"agent", "alias", "all", "and", "as", "assign", "check", "class", "convert", "create", "current", "debug", "deferred", "do", "else", "elseif", "end", "ensure", "expanded", "export", "external", "false", "feature", "from", "frozen", "if", "implies", "indexing", "infix", "inherit", "inspect", "invariant", "is", "like", "local", "loop", "not", "obsolete", "old", "once", "or", "prefix", "precursor", "pure", "redefine", "reference", "rename", "require", "rescue", "result", "retry", "separate", "then", "true", "tuple", "undefine", "creation", "until", "insert"},
  },
  { Id=2,
    List={"integer", "real", "double", "character", "", "boolean", "string"},
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]],
  },
}

Strings={
  Delimiter=[["|']],
  Escape=[=[ %\d{3}|\\x[[:xdigit:]]{2}|%[nNtvbrfa%\?'"]|%$ ]=]
}

IgnoreCase=true

Comments={
  { Block=false,
    Delimiter= { [[--]] },
  },
}

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

--FIXME no default escchar param: regex(%\d{3}|\\x[[:xdigit:]]{2}|%[nNtvbrfa%\?'"]|%$)