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diff --git a/pygments/lexers/hdl.py b/pygments/lexers/hdl.py
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--- a/pygments/lexers/hdl.py
+++ /dev/null
@@ -1,382 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    pygments.lexers.hdl
-    ~~~~~~~~~~~~~~~~~~~
-
-    Lexers for hardware descriptor languages.
-
-    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-
-import re
-
-from pygments.lexer import RegexLexer, bygroups, include, using, this, words
-from pygments.token import Text, Comment, Operator, Keyword, Name, String, \
-    Number, Punctuation, Error
-
-__all__ = ['VerilogLexer', 'SystemVerilogLexer', 'VhdlLexer']
-
-
-class VerilogLexer(RegexLexer):
-    """
-    For verilog source code with preprocessor directives.
-
-    .. versionadded:: 1.4
-    """
-    name = 'verilog'
-    aliases = ['verilog', 'v']
-    filenames = ['*.v']
-    mimetypes = ['text/x-verilog']
-
-    #: optional Comment or Whitespace
-    _ws = r'(?:\s|//.*?\n|/[*].*?[*]/)+'
-
-    tokens = {
-        'root': [
-            (r'^\s*`define', Comment.Preproc, 'macro'),
-            (r'\n', Text),
-            (r'\s+', Text),
-            (r'\\\n', Text),  # line continuation
-            (r'/(\\\n)?/(\n|(.|\n)*?[^\\]\n)', Comment.Single),
-            (r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
-            (r'[{}#@]', Punctuation),
-            (r'L?"', String, 'string'),
-            (r"L?'(\\.|\\[0-7]{1,3}|\\x[a-fA-F0-9]{1,2}|[^\\\'\n])'", String.Char),
-            (r'(\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+[lL]?', Number.Float),
-            (r'(\d+\.\d*|\.\d+|\d+[fF])[fF]?', Number.Float),
-            (r'([0-9]+)|(\'h)[0-9a-fA-F]+', Number.Hex),
-            (r'([0-9]+)|(\'b)[01]+', Number.Bin),
-            (r'([0-9]+)|(\'d)[0-9]+', Number.Integer),
-            (r'([0-9]+)|(\'o)[0-7]+', Number.Oct),
-            (r'\'[01xz]', Number),
-            (r'\d+[Ll]?', Number.Integer),
-            (r'\*/', Error),
-            (r'[~!%^&*+=|?:<>/-]', Operator),
-            (r'[()\[\],.;\']', Punctuation),
-            (r'`[a-zA-Z_]\w*', Name.Constant),
-
-            (r'^(\s*)(package)(\s+)', bygroups(Text, Keyword.Namespace, Text)),
-            (r'^(\s*)(import)(\s+)', bygroups(Text, Keyword.Namespace, Text),
-             'import'),
-
-            (words((
-                'always', 'always_comb', 'always_ff', 'always_latch', 'and',
-                'assign', 'automatic', 'begin', 'break', 'buf', 'bufif0', 'bufif1',
-                'case', 'casex', 'casez', 'cmos', 'const', 'continue', 'deassign',
-                'default', 'defparam', 'disable', 'do', 'edge', 'else', 'end', 'endcase',
-                'endfunction', 'endgenerate', 'endmodule', 'endpackage', 'endprimitive',
-                'endspecify', 'endtable', 'endtask', 'enum', 'event', 'final', 'for',
-                'force', 'forever', 'fork', 'function', 'generate', 'genvar', 'highz0',
-                'highz1', 'if', 'initial', 'inout', 'input', 'integer', 'join', 'large',
-                'localparam', 'macromodule', 'medium', 'module', 'nand', 'negedge',
-                'nmos', 'nor', 'not', 'notif0', 'notif1', 'or', 'output', 'packed',
-                'parameter', 'pmos', 'posedge', 'primitive', 'pull0', 'pull1',
-                'pulldown', 'pullup', 'rcmos', 'ref', 'release', 'repeat', 'return',
-                'rnmos', 'rpmos', 'rtran', 'rtranif0', 'rtranif1', 'scalared', 'signed',
-                'small', 'specify', 'specparam', 'strength', 'string', 'strong0',
-                'strong1', 'struct', 'table', 'task', 'tran', 'tranif0', 'tranif1',
-                'type', 'typedef', 'unsigned', 'var', 'vectored', 'void', 'wait',
-                'weak0', 'weak1', 'while', 'xnor', 'xor'), suffix=r'\b'),
-             Keyword),
-
-            (words((
-                'accelerate', 'autoexpand_vectornets', 'celldefine', 'default_nettype',
-                'else', 'elsif', 'endcelldefine', 'endif', 'endprotect', 'endprotected',
-                'expand_vectornets', 'ifdef', 'ifndef', 'include', 'noaccelerate',
-                'noexpand_vectornets', 'noremove_gatenames', 'noremove_netnames',
-                'nounconnected_drive', 'protect', 'protected', 'remove_gatenames',
-                'remove_netnames', 'resetall', 'timescale', 'unconnected_drive',
-                'undef'), prefix=r'`', suffix=r'\b'),
-             Comment.Preproc),
-
-            (words((
-                'bits', 'bitstoreal', 'bitstoshortreal', 'countdrivers', 'display', 'fclose',
-                'fdisplay', 'finish', 'floor', 'fmonitor', 'fopen', 'fstrobe', 'fwrite',
-                'getpattern', 'history', 'incsave', 'input', 'itor', 'key', 'list', 'log',
-                'monitor', 'monitoroff', 'monitoron', 'nokey', 'nolog', 'printtimescale',
-                'random', 'readmemb', 'readmemh', 'realtime', 'realtobits', 'reset',
-                'reset_count', 'reset_value', 'restart', 'rtoi', 'save', 'scale', 'scope',
-                'shortrealtobits', 'showscopes', 'showvariables', 'showvars', 'sreadmemb',
-                'sreadmemh', 'stime', 'stop', 'strobe', 'time', 'timeformat', 'write'),
-                prefix=r'\$', suffix=r'\b'),
-             Name.Builtin),
-
-            (words((
-                'byte', 'shortint', 'int', 'longint', 'integer', 'time',
-                'bit', 'logic', 'reg', 'supply0', 'supply1', 'tri', 'triand',
-                'trior', 'tri0', 'tri1', 'trireg', 'uwire', 'wire', 'wand', 'wo'
-                'shortreal', 'real', 'realtime'), suffix=r'\b'),
-             Keyword.Type),
-            (r'[a-zA-Z_]\w*:(?!:)', Name.Label),
-            (r'\$?[a-zA-Z_]\w*', Name),
-        ],
-        'string': [
-            (r'"', String, '#pop'),
-            (r'\\([\\abfnrtv"\']|x[a-fA-F0-9]{2,4}|[0-7]{1,3})', String.Escape),
-            (r'[^\\"\n]+', String),  # all other characters
-            (r'\\\n', String),  # line continuation
-            (r'\\', String),  # stray backslash
-        ],
-        'macro': [
-            (r'[^/\n]+', Comment.Preproc),
-            (r'/[*](.|\n)*?[*]/', Comment.Multiline),
-            (r'//.*?\n', Comment.Single, '#pop'),
-            (r'/', Comment.Preproc),
-            (r'(?<=\\)\n', Comment.Preproc),
-            (r'\n', Comment.Preproc, '#pop'),
-        ],
-        'import': [
-            (r'[\w:]+\*?', Name.Namespace, '#pop')
-        ]
-    }
-
-    def get_tokens_unprocessed(self, text):
-        for index, token, value in \
-                RegexLexer.get_tokens_unprocessed(self, text):
-            # Convention: mark all upper case names as constants
-            if token is Name:
-                if value.isupper():
-                    token = Name.Constant
-            yield index, token, value
-
-
-class SystemVerilogLexer(RegexLexer):
-    """
-    Extends verilog lexer to recognise all SystemVerilog keywords from IEEE
-    1800-2009 standard.
-
-    .. versionadded:: 1.5
-    """
-    name = 'systemverilog'
-    aliases = ['systemverilog', 'sv']
-    filenames = ['*.sv', '*.svh']
-    mimetypes = ['text/x-systemverilog']
-
-    #: optional Comment or Whitespace
-    _ws = r'(?:\s|//.*?\n|/[*].*?[*]/)+'
-
-    tokens = {
-        'root': [
-            (r'^\s*`define', Comment.Preproc, 'macro'),
-            (r'^(\s*)(package)(\s+)', bygroups(Text, Keyword.Namespace, Text)),
-            (r'^(\s*)(import)(\s+)', bygroups(Text, Keyword.Namespace, Text), 'import'),
-
-            (r'\n', Text),
-            (r'\s+', Text),
-            (r'\\\n', Text),  # line continuation
-            (r'/(\\\n)?/(\n|(.|\n)*?[^\\]\n)', Comment.Single),
-            (r'/(\\\n)?[*](.|\n)*?[*](\\\n)?/', Comment.Multiline),
-            (r'[{}#@]', Punctuation),
-            (r'L?"', String, 'string'),
-            (r"L?'(\\.|\\[0-7]{1,3}|\\x[a-fA-F0-9]{1,2}|[^\\\'\n])'", String.Char),
-            (r'(\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+[lL]?', Number.Float),
-            (r'(\d+\.\d*|\.\d+|\d+[fF])[fF]?', Number.Float),
-            (r'([0-9]+)|(\'h)[0-9a-fA-F]+', Number.Hex),
-            (r'([0-9]+)|(\'b)[01]+', Number.Bin),
-            (r'([0-9]+)|(\'d)[0-9]+', Number.Integer),
-            (r'([0-9]+)|(\'o)[0-7]+', Number.Oct),
-            (r'\'[01xz]', Number),
-            (r'\d+[Ll]?', Number.Integer),
-            (r'\*/', Error),
-            (r'[~!%^&*+=|?:<>/-]', Operator),
-            (r'[()\[\],.;\']', Punctuation),
-            (r'`[a-zA-Z_]\w*', Name.Constant),
-
-            (words((
-                'accept_on', 'alias', 'always', 'always_comb', 'always_ff', 'always_latch',
-                'and', 'assert', 'assign', 'assume', 'automatic', 'before', 'begin', 'bind', 'bins',
-                'binsof', 'bit', 'break', 'buf', 'bufif0', 'bufif1', 'byte', 'case', 'casex', 'casez',
-                'cell', 'chandle', 'checker', 'class', 'clocking', 'cmos', 'config', 'const', 'constraint',
-                'context', 'continue', 'cover', 'covergroup', 'coverpoint', 'cross', 'deassign',
-                'default', 'defparam', 'design', 'disable', 'dist', 'do', 'edge', 'else', 'end', 'endcase',
-                'endchecker', 'endclass', 'endclocking', 'endconfig', 'endfunction', 'endgenerate',
-                'endgroup', 'endinterface', 'endmodule', 'endpackage', 'endprimitive',
-                'endprogram', 'endproperty', 'endsequence', 'endspecify', 'endtable',
-                'endtask', 'enum', 'event', 'eventually', 'expect', 'export', 'extends', 'extern',
-                'final', 'first_match', 'for', 'force', 'foreach', 'forever', 'fork', 'forkjoin',
-                'function', 'generate', 'genvar', 'global', 'highz0', 'highz1', 'if', 'iff', 'ifnone',
-                'ignore_bins', 'illegal_bins', 'implies', 'import', 'incdir', 'include',
-                'initial', 'inout', 'input', 'inside', 'instance', 'int', 'integer', 'interface',
-                'intersect', 'join', 'join_any', 'join_none', 'large', 'let', 'liblist', 'library',
-                'local', 'localparam', 'logic', 'longint', 'macromodule', 'matches', 'medium',
-                'modport', 'module', 'nand', 'negedge', 'new', 'nexttime', 'nmos', 'nor', 'noshowcancelled',
-                'not', 'notif0', 'notif1', 'null', 'or', 'output', 'package', 'packed', 'parameter',
-                'pmos', 'posedge', 'primitive', 'priority', 'program', 'property', 'protected',
-                'pull0', 'pull1', 'pulldown', 'pullup', 'pulsestyle_ondetect', 'pulsestyle_onevent',
-                'pure', 'rand', 'randc', 'randcase', 'randsequence', 'rcmos', 'real', 'realtime',
-                'ref', 'reg', 'reject_on', 'release', 'repeat', 'restrict', 'return', 'rnmos',
-                'rpmos', 'rtran', 'rtranif0', 'rtranif1', 's_always', 's_eventually', 's_nexttime',
-                's_until', 's_until_with', 'scalared', 'sequence', 'shortint', 'shortreal',
-                'showcancelled', 'signed', 'small', 'solve', 'specify', 'specparam', 'static',
-                'string', 'strong', 'strong0', 'strong1', 'struct', 'super', 'supply0', 'supply1',
-                'sync_accept_on', 'sync_reject_on', 'table', 'tagged', 'task', 'this', 'throughout',
-                'time', 'timeprecision', 'timeunit', 'tran', 'tranif0', 'tranif1', 'tri', 'tri0',
-                'tri1', 'triand', 'trior', 'trireg', 'type', 'typedef', 'union', 'unique', 'unique0',
-                'unsigned', 'until', 'until_with', 'untyped', 'use', 'uwire', 'var', 'vectored',
-                'virtual', 'void', 'wait', 'wait_order', 'wand', 'weak', 'weak0', 'weak1', 'while',
-                'wildcard', 'wire', 'with', 'within', 'wor', 'xnor', 'xor'), suffix=r'\b'),
-             Keyword),
-
-            (words((
-                '`__FILE__', '`__LINE__', '`begin_keywords', '`celldefine', '`default_nettype',
-                '`define', '`else', '`elsif', '`end_keywords', '`endcelldefine', '`endif',
-                '`ifdef', '`ifndef', '`include', '`line', '`nounconnected_drive', '`pragma',
-                '`resetall', '`timescale', '`unconnected_drive', '`undef', '`undefineall'),
-                suffix=r'\b'),
-             Comment.Preproc),
-
-            (words((
-                '$display', '$displayb', '$displayh', '$displayo', '$dumpall', '$dumpfile',
-                '$dumpflush', '$dumplimit', '$dumpoff', '$dumpon', '$dumpports',
-                '$dumpportsall', '$dumpportsflush', '$dumpportslimit', '$dumpportsoff',
-                '$dumpportson', '$dumpvars', '$fclose', '$fdisplay', '$fdisplayb',
-                '$fdisplayh', '$fdisplayo', '$feof', '$ferror', '$fflush', '$fgetc',
-                '$fgets', '$finish', '$fmonitor', '$fmonitorb', '$fmonitorh', '$fmonitoro',
-                '$fopen', '$fread', '$fscanf', '$fseek', '$fstrobe', '$fstrobeb', '$fstrobeh',
-                '$fstrobeo', '$ftell', '$fwrite', '$fwriteb', '$fwriteh', '$fwriteo',
-                '$monitor', '$monitorb', '$monitorh', '$monitoro', '$monitoroff',
-                '$monitoron', '$plusargs', '$random', '$readmemb', '$readmemh', '$rewind',
-                '$sformat', '$sformatf', '$sscanf', '$strobe', '$strobeb', '$strobeh', '$strobeo',
-                '$swrite', '$swriteb', '$swriteh', '$swriteo', '$test', '$ungetc',
-                '$value$plusargs', '$write', '$writeb', '$writeh', '$writememb',
-                '$writememh', '$writeo'), suffix=r'\b'),
-             Name.Builtin),
-
-            (r'(class)(\s+)', bygroups(Keyword, Text), 'classname'),
-            (words((
-                'byte', 'shortint', 'int', 'longint', 'integer', 'time',
-                'bit', 'logic', 'reg', 'supply0', 'supply1', 'tri', 'triand',
-                'trior', 'tri0', 'tri1', 'trireg', 'uwire', 'wire', 'wand', 'wo'
-                'shortreal', 'real', 'realtime'), suffix=r'\b'),
-             Keyword.Type),
-            (r'[a-zA-Z_]\w*:(?!:)', Name.Label),
-            (r'\$?[a-zA-Z_]\w*', Name),
-        ],
-        'classname': [
-            (r'[a-zA-Z_]\w*', Name.Class, '#pop'),
-        ],
-        'string': [
-            (r'"', String, '#pop'),
-            (r'\\([\\abfnrtv"\']|x[a-fA-F0-9]{2,4}|[0-7]{1,3})', String.Escape),
-            (r'[^\\"\n]+', String),  # all other characters
-            (r'\\\n', String),  # line continuation
-            (r'\\', String),  # stray backslash
-        ],
-        'macro': [
-            (r'[^/\n]+', Comment.Preproc),
-            (r'/[*](.|\n)*?[*]/', Comment.Multiline),
-            (r'//.*?\n', Comment.Single, '#pop'),
-            (r'/', Comment.Preproc),
-            (r'(?<=\\)\n', Comment.Preproc),
-            (r'\n', Comment.Preproc, '#pop'),
-        ],
-        'import': [
-            (r'[\w:]+\*?', Name.Namespace, '#pop')
-        ]
-    }
-
-    def get_tokens_unprocessed(self, text):
-        for index, token, value in \
-                RegexLexer.get_tokens_unprocessed(self, text):
-            # Convention: mark all upper case names as constants
-            if token is Name:
-                if value.isupper():
-                    token = Name.Constant
-            yield index, token, value
-
-
-class VhdlLexer(RegexLexer):
-    """
-    For VHDL source code.
-
-    .. versionadded:: 1.5
-    """
-    name = 'vhdl'
-    aliases = ['vhdl']
-    filenames = ['*.vhdl', '*.vhd']
-    mimetypes = ['text/x-vhdl']
-    flags = re.MULTILINE | re.IGNORECASE
-
-    tokens = {
-        'root': [
-            (r'\n', Text),
-            (r'\s+', Text),
-            (r'\\\n', Text),  # line continuation
-            (r'--.*?$', Comment.Single),
-            (r"'(U|X|0|1|Z|W|L|H|-)'", String.Char),
-            (r'[~!%^&*+=|?:<>/-]', Operator),
-            (r"'[a-z_]\w*", Name.Attribute),
-            (r'[()\[\],.;\']', Punctuation),
-            (r'"[^\n\\"]*"', String),
-
-            (r'(library)(\s+)([a-z_]\w*)',
-             bygroups(Keyword, Text, Name.Namespace)),
-            (r'(use)(\s+)(entity)', bygroups(Keyword, Text, Keyword)),
-            (r'(use)(\s+)([a-z_][\w.]*\.)(all)',
-             bygroups(Keyword, Text, Name.Namespace, Keyword)),
-            (r'(use)(\s+)([a-z_][\w.]*)',
-             bygroups(Keyword, Text, Name.Namespace)),
-            (r'(std|ieee)(\.[a-z_]\w*)',
-             bygroups(Name.Namespace, Name.Namespace)),
-            (words(('std', 'ieee', 'work'), suffix=r'\b'),
-             Name.Namespace),
-            (r'(entity|component)(\s+)([a-z_]\w*)',
-             bygroups(Keyword, Text, Name.Class)),
-            (r'(architecture|configuration)(\s+)([a-z_]\w*)(\s+)'
-             r'(of)(\s+)([a-z_]\w*)(\s+)(is)',
-             bygroups(Keyword, Text, Name.Class, Text, Keyword, Text,
-                      Name.Class, Text, Keyword)),
-            (r'([a-z_]\w*)(:)(\s+)(process|for)',
-             bygroups(Name.Class, Operator, Text, Keyword)),
-            (r'(end)(\s+)', bygroups(using(this), Text), 'endblock'),
-
-            include('types'),
-            include('keywords'),
-            include('numbers'),
-
-            (r'[a-z_]\w*', Name),
-        ],
-        'endblock': [
-            include('keywords'),
-            (r'[a-z_]\w*', Name.Class),
-            (r'(\s+)', Text),
-            (r';', Punctuation, '#pop'),
-        ],
-        'types': [
-            (words((
-                'boolean', 'bit', 'character', 'severity_level', 'integer', 'time',
-                'delay_length', 'natural', 'positive', 'string', 'bit_vector',
-                'file_open_kind', 'file_open_status', 'std_ulogic', 'std_ulogic_vector',
-                'std_logic', 'std_logic_vector', 'signed', 'unsigned'), suffix=r'\b'),
-             Keyword.Type),
-        ],
-        'keywords': [
-            (words((
-                'abs', 'access', 'after', 'alias', 'all', 'and',
-                'architecture', 'array', 'assert', 'attribute', 'begin', 'block',
-                'body', 'buffer', 'bus', 'case', 'component', 'configuration',
-                'constant', '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', 'return', 'rol', 'ror', 'select',
-                'severity', 'signal', 'shared', 'sla', 'sll', 'sra',
-                'srl', 'subtype', 'then', 'to', 'transport', 'type',
-                'units', 'until', 'use', 'variable', 'wait', 'when',
-                'while', 'with', 'xnor', 'xor'), suffix=r'\b'),
-             Keyword),
-        ],
-        'numbers': [
-            (r'\d{1,2}#[0-9a-f_]+#?', Number.Integer),
-            (r'\d+', Number.Integer),
-            (r'(\d+\.\d*|\.\d+|\d+)E[+-]?\d+', Number.Float),
-            (r'X"[0-9a-f_]+"', Number.Hex),
-            (r'O"[0-7_]+"', Number.Oct),
-            (r'B"[01_]+"', Number.Bin),
-        ],
-    }