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

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-- Language definition generated by lang2to3

Description="Vala"

Keywords={
  { Id=1,
    List={"if", "else", "switch", "case", "default", "break", "continue", "return", "for", "foreach", "in", "do", "while", "try", "catch", "finally", "throw"},
  },
  { Id=2,
    List={"namespace", "interface", "class", "struct", "enum", "signal", "construct", "callback", "get", "set", "base", "const", "static", "var", "weak", "virtual", "abstract", "override", "public", "protected", "private", "in", "out", "ref", "", "lock", "using", "abstract", "dynamic", "extern", "internal", "readonly", "sealed", "volatile"},
  },
  { Id=3,
    List={"true", "false", "null", "bool", "byte", "char", "decimal", "double", "float", "int", "int8", "int16", "int32", "int64", "long", "object", "sbyte", "short", "string", "uchar", "uint", "uint8", "uint16", "uint32", "uint64", "ulong", "ushort", "void"},
  },
  { Id=4,
    Regex=[[(\w+)\s*\(]],
  },
}

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

IgnoreCase=false

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

PreProcessor={
  Prefix=[[#]],
}

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

EnableIndentation=false

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