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+"""
+    pygments.lexers.j
+    ~~~~~~~~~~~~~~~~~
+
+    Lexer for the J programming language.
+
+    :copyright: Copyright 2006-present by the Pygments team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from pygments.lexer import RegexLexer, words, include, bygroups
+from pygments.token import Comment, Keyword, Name, Number, Operator, \
+    Punctuation, String, Whitespace
+
+__all__ = ['JLexer']
+
+
+class JLexer(RegexLexer):
+    """
+    For J source code.
+    """
+
+    name = 'J'
+    url = 'http://jsoftware.com/'
+    aliases = ['j']
+    filenames = ['*.ijs']
+    mimetypes = ['text/x-j']
+    version_added = '2.1'
+
+    validName = r'\b[a-zA-Z]\w*'
+
+    tokens = {
+        'root': [
+            # Shebang script
+            (r'#!.*$', Comment.Preproc),
+
+            # Comments
+            (r'NB\..*', Comment.Single),
+            (r'(\n+\s*)(Note)', bygroups(Whitespace, Comment.Multiline),
+                'comment'),
+            (r'(\s*)(Note.*)', bygroups(Whitespace, Comment.Single)),
+
+            # Whitespace
+            (r'\s+', Whitespace),
+
+            # Strings
+            (r"'", String, 'singlequote'),
+
+            # Definitions
+            (r'0\s+:\s*0', Name.Entity, 'nounDefinition'),
+            (r'(noun)(\s+)(define)(\s*)$', bygroups(Name.Entity, Whitespace,
+                Name.Entity, Whitespace), 'nounDefinition'),
+            (r'([1-4]|13)\s+:\s*0\b',
+                Name.Function, 'explicitDefinition'),
+            (r'(adverb|conjunction|dyad|monad|verb)(\s+)(define)\b',
+                bygroups(Name.Function, Whitespace, Name.Function),
+                'explicitDefinition'),
+
+            # Flow Control
+            (words(('for_', 'goto_', 'label_'), suffix=validName+r'\.'), Name.Label),
+            (words((
+                'assert', 'break', 'case', 'catch', 'catchd',
+                'catcht', 'continue', 'do', 'else', 'elseif',
+                'end', 'fcase', 'for', 'if', 'return',
+                'select', 'throw', 'try', 'while', 'whilst',
+                ), suffix=r'\.'), Name.Label),
+
+            # Variable Names
+            (validName, Name.Variable),
+
+            # Standard Library
+            (words((
+                'ARGV', 'CR', 'CRLF', 'DEL', 'Debug',
+                'EAV', 'EMPTY', 'FF', 'JVERSION', 'LF',
+                'LF2', 'Note', 'TAB', 'alpha17', 'alpha27',
+                'apply', 'bind', 'boxopen', 'boxxopen', 'bx',
+                'clear', 'cutLF', 'cutopen', 'datatype', 'def',
+                'dfh', 'drop', 'each', 'echo', 'empty',
+                'erase', 'every', 'evtloop', 'exit', 'expand',
+                'fetch', 'file2url', 'fixdotdot', 'fliprgb', 'getargs',
+                'getenv', 'hfd', 'inv', 'inverse', 'iospath',
+                'isatty', 'isutf8', 'items', 'leaf', 'list',
+                'nameclass', 'namelist', 'names', 'nc',
+                'nl', 'on', 'pick', 'rows',
+                'script', 'scriptd', 'sign', 'sminfo', 'smoutput',
+                'sort', 'split', 'stderr', 'stdin', 'stdout',
+                'table', 'take', 'timespacex', 'timex', 'tmoutput',
+                'toCRLF', 'toHOST', 'toJ', 'tolower', 'toupper',
+                'type', 'ucp', 'ucpcount', 'usleep', 'utf8',
+                'uucp',
+                )), Name.Function),
+
+            # Copula
+            (r'=[.:]', Operator),
+
+            # Builtins
+            (r'[-=+*#$%@!~`^&";:.,<>{}\[\]\\|/?]', Operator),
+
+            # Short Keywords
+            (r'[abCdDeEfHiIjLMoprtT]\.',  Keyword.Reserved),
+            (r'[aDiLpqsStux]\:', Keyword.Reserved),
+            (r'(_[0-9])\:', Keyword.Constant),
+
+            # Parens
+            (r'\(', Punctuation, 'parentheses'),
+
+            # Numbers
+            include('numbers'),
+        ],
+
+        'comment': [
+            (r'[^)]', Comment.Multiline),
+            (r'^\)', Comment.Multiline, '#pop'),
+            (r'[)]', Comment.Multiline),
+        ],
+
+        'explicitDefinition': [
+            (r'\b[nmuvxy]\b', Name.Decorator),
+            include('root'),
+            (r'[^)]', Name),
+            (r'^\)', Name.Label, '#pop'),
+            (r'[)]', Name),
+        ],
+
+        'numbers': [
+            (r'\b_{1,2}\b', Number),
+            (r'_?\d+(\.\d+)?(\s*[ejr]\s*)_?\d+(\.?=\d+)?', Number),
+            (r'_?\d+\.(?=\d+)', Number.Float),
+            (r'_?\d+x', Number.Integer.Long),
+            (r'_?\d+', Number.Integer),
+        ],
+
+        'nounDefinition': [
+            (r'[^)]+', String),
+            (r'^\)', Name.Label, '#pop'),
+            (r'[)]', String),
+        ],
+
+        'parentheses': [
+            (r'\)', Punctuation, '#pop'),
+            # include('nounDefinition'),
+            include('explicitDefinition'),
+            include('root'),
+        ],
+
+        'singlequote': [
+            (r"[^']+", String),
+            (r"''", String),
+            (r"'", String, '#pop'),
+        ],
+    }