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/usr/share/highlight/langDefs/ada.lang is in highlight-common 3.18-3build1.

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Description="ADA95"

Keywords={
  { Id=1,
    List={"abort", "else", "new", "return", "abs", "elsif", "not", "reverse", "abstract", "end", "null", "accept", "entry", "select", "access", "exception", "separate", "aliased", "exit", "of", "subtype", "all", "or", "and", "for", "others", "tagged", "array", "function", "out", "task", "at", "terminate", "generic", "package", "then", "begin", "goto", "pragma", "type", "body", "private", "if", "procedure", "case", "in", "protected", "until", "constant", "is", "use", "raise", "declare", "range", "when", "delay", "limited", "record", "while", "delta", "loop", "rem", "with", "digits", "renames", "do", "mod", "requeue", "xor"},
  },
  { Id=2,
    List={"boolean", "integer", "natural", "positive", "float", "character", "string", "duration", "short_integer", "long_integer", "short_float", "long_float"},
  },
  { Id=3,
    List={"wide_character", "wide_string", "short_short_integer", "long_long_integer", "short_short_float", "long_long_float"},
  },
  { Id=4,
    List={"true", "false"},
  },
   { Id=4,
     Regex=[[ [\w\)]+('\w+) ]],
   },
   { Id=4,
     Regex=[[''']],
   }
}

-- Workaround: distinguish string delimiters and event markers
-- (same eymbol: ')

--workaround for special string '''

Strings={
  Delimiter=[["|']],
  Escape = [[ \\[^'] ]]
}

IgnoreCase=true

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

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