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/usr/share/highlight/langDefs/vhd.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="VHDL"

Keywords={
  { Id=1,
    List={"abs", "access", "after", "all", "and", "architecture", "array", "assert", "attribute", "begin", "block", "body", "buffer", "bus", "case", "component", "configuration", "disconnect", "downto", "else", "elsif", "end", "entity", "exit", "file", "for", "function", "generate", "generic", "group", "guarded", "if", "impure", "in", "inertial", "inout", "is", "label", "library", "linkage", "literal", "loop", "map", "mod", "nand", "new", "next", "nor", "not", "null", "of", "on", "open", "or", "others", "out", "package", "port", "postponed", "procedure", "process", "pure", "range", "record", "register", "reject", "rem", "report", "return", "rol", "ror", "select", "severity", "shared", "sla", "sll", "sra", "srl", "then", "to", "transport", "unaffected", "units", "until", "use",  "wait", "when", "while", "with", "xnor", "xor", "ActivPullUp", "AndN", "And2FF", "AndNFF", "Cnt1Bit", "CntNBit", "CntNBitDown", "CntNBitMod", "CntNBitOe", "CntNBitSLd", "CntNBitSR", "CntNBitUpDown", "CompNBit", "CompNBitFF", "DiffH2LWithFF", "DiffL2HWithFF", "Dff1", "Dff1NegClk", "Dffn", "Encode4to5", "Mux1of2", "Mux1of8", "Mux1Vof2V", "Mux1Vof3V", "Mux1Vof4V", "PreScale1Bit", "PreScale1BitAR", "PreScale1BitARNegClk", "PreScaleNBit", "PreScaleNBitAR", "Reg1Bit", "Reg1BitAR", "Reg1BitR", "RegNBit", "RegNBitAR", "RSFFAsync", "RSFFsync", "RsSynchronizer", "ShiftP2SRegNBitAR", "ShiftRegNBitAR", "ShiftS2SRegNBit", "SRFFsync", "SyncAndDiffL2HWithFF", "SyncAndDiffH2LWithFF", "SyncAndDiffL2HWithFFAndFg", "SyncAndDiffH2LWithFFAndFg", "SyncAndDiffLL2HHWithFF", "SyncAndDiffHH2LLWithFF", "SyncAndDiffLL2HHWithFFAndFg", "SyncAndDiffHH2LLWithFFAndFg", "ActivPullUp_arch", "AndN_arch", "And2FF_arch", "AndNFF_arch", "Cnt1Bit_arch", "CntNBit_arch", "CntNBitDown_arch", "CntNBitMod_arch", "CntNBitOe_arch", "CntNBitSLd_arch", "CntNBitSR_arch", "CntNBitUpDown_arch", "CompNBit_arch", "CompNBitFF_arch", "DiffH2LWithFF_arch", "DiffL2HWithFF_arch", "Dff1_arch", "Dff1NegClk_arch", "Dffn_arch", "Encode4to5_arch", "Mux1of2_arch", "Mux1of8_arch", "Mux1Vof2V_arch", "Mux1Vof3V_arch", "Mux1Vof4V_arch", "PreScale1Bit_arch", "PreScale1BitAR_arch", "PreScale1BitARNegClk_arch", "PreScaleNBit_arch", "PreScaleNBitAR_arch", "Reg1Bit_arch", "Reg1BitAR_arch", "Reg1BitR_arch", "RegNBit_arch", "RegNBitAR_arch", "RSFFAsync_arch", "RSFFsync_arch", "RsSynchronizer_arch", "ShiftP2SRegNBitAR_arch", "ShiftRegNBitAR_arch", "ShiftS2SRegNBit_arch", "SRFFsync_arch", "SyncAndDiffL2HWithFF_arch", "SyncAndDiffH2LWithFF_arch", "SyncAndDiffL2HWithFFAndFg_arch", "SyncAndDiffH2LWithFFAndFg_arch", "SyncAndDiffLL2HHWithFF_arch", "SyncAndDiffHH2LLWithFF_arch", "SyncAndDiffLL2HHWithFFAndFg_arch", "SyncAndDiffHH2LLWithFFAndFg_arch"},
  },
  { Id=2,
    List={"bit", "bit_vector", "boolean", "integer", "real", "std_logic", "std_logic_vector", "time", "character", "string"},
  },
  { Id=3,
    List={"alias", "constant", "type", "variable", "signal", "subtype"},
  },
  { Id=4,
    Regex=[[[\w\(\)]+('\w+)]],
  },
}

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

IgnoreCase=true

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

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