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Code Editor : parsers.py
""" pygments.lexers.parsers ~~~~~~~~~~~~~~~~~~~~~~~ Lexers for parser generators. :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS. :license: BSD, see LICENSE for details. """ import re from pygments.lexer import RegexLexer, DelegatingLexer, \ include, bygroups, using from pygments.token import Punctuation, Other, Text, Comment, Operator, \ Keyword, Name, String, Number, Whitespace from pygments.lexers.jvm import JavaLexer from pygments.lexers.c_cpp import CLexer, CppLexer from pygments.lexers.objective import ObjectiveCLexer from pygments.lexers.d import DLexer from pygments.lexers.dotnet import CSharpLexer from pygments.lexers.ruby import RubyLexer from pygments.lexers.python import PythonLexer from pygments.lexers.perl import PerlLexer __all__ = ['RagelLexer', 'RagelEmbeddedLexer', 'RagelCLexer', 'RagelDLexer', 'RagelCppLexer', 'RagelObjectiveCLexer', 'RagelRubyLexer', 'RagelJavaLexer', 'AntlrLexer', 'AntlrPythonLexer', 'AntlrPerlLexer', 'AntlrRubyLexer', 'AntlrCppLexer', 'AntlrCSharpLexer', 'AntlrObjectiveCLexer', 'AntlrJavaLexer', 'AntlrActionScriptLexer', 'TreetopLexer', 'EbnfLexer'] class RagelLexer(RegexLexer): """ A pure `Ragel <http://www.complang.org/ragel/>`_ lexer. Use this for fragments of Ragel. For ``.rl`` files, use RagelEmbeddedLexer instead (or one of the language-specific subclasses). .. versionadded:: 1.1 """ name = 'Ragel' aliases = ['ragel'] filenames = [] tokens = { 'whitespace': [ (r'\s+', Whitespace) ], 'comments': [ (r'\#.*$', Comment), ], 'keywords': [ (r'(access|action|alphtype)\b', Keyword), (r'(getkey|write|machine|include)\b', Keyword), (r'(any|ascii|extend|alpha|digit|alnum|lower|upper)\b', Keyword), (r'(xdigit|cntrl|graph|print|punct|space|zlen|empty)\b', Keyword) ], 'numbers': [ (r'0x[0-9A-Fa-f]+', Number.Hex), (r'[+-]?[0-9]+', Number.Integer), ], 'literals': [ (r'"(\\\\|\\[^\\]|[^"\\])*"', String.Double), (r"'(\\\\|\\[^\\]|[^'\\])*'", String.Single), (r'\[(\\\\|\\[^\\]|[^\\\]])*\]', String), # square bracket literals (r'/(?!\*)(\\\\|\\[^\\]|[^/\\])*/', String.Regex), # regular expressions ], 'identifiers': [ (r'[a-zA-Z_]\w*', Name.Variable), ], 'operators': [ (r',', Operator), # Join (r'\||&|--?', Operator), # Union, Intersection and Subtraction (r'\.|<:|:>>?', Operator), # Concatention (r':', Operator), # Label (r'->', Operator), # Epsilon Transition (r'(>|\$|%|<|@|<>)(/|eof\b)', Operator), # EOF Actions (r'(>|\$|%|<|@|<>)(!|err\b)', Operator), # Global Error Actions (r'(>|\$|%|<|@|<>)(\^|lerr\b)', Operator), # Local Error Actions (r'(>|\$|%|<|@|<>)(~|to\b)', Operator), # To-State Actions (r'(>|\$|%|<|@|<>)(\*|from\b)', Operator), # From-State Actions (r'>|@|\$|%', Operator), # Transition Actions and Priorities (r'\*|\?|\+|\{[0-9]*,[0-9]*\}', Operator), # Repetition (r'!|\^', Operator), # Negation (r'\(|\)', Operator), # Grouping ], 'root': [ include('literals'), include('whitespace'), include('comments'), include('keywords'), include('numbers'), include('identifiers'), include('operators'), (r'\{', Punctuation, 'host'), (r'=', Operator), (r';', Punctuation), ], 'host': [ (r'(' + r'|'.join(( # keep host code in largest possible chunks r'[^{}\'"/#]+', # exclude unsafe characters r'[^\\]\\[{}]', # allow escaped { or } # strings and comments may safely contain unsafe characters r'"(\\\\|\\[^\\]|[^"\\])*"', r"'(\\\\|\\[^\\]|[^'\\])*'", r'//.*$\n?', # single line comment r'/\*(.|\n)*?\*/', # multi-line javadoc-style comment r'\#.*$\n?', # ruby comment # regular expression: There's no reason for it to start # with a * and this stops confusion with comments. r'/(?!\*)(\\\\|\\[^\\]|[^/\\])*/', # / is safe now that we've handled regex and javadoc comments r'/', )) + r')+', Other), (r'\{', Punctuation, '#push'), (r'\}', Punctuation, '#pop'), ], } class RagelEmbeddedLexer(RegexLexer): """ A lexer for `Ragel`_ embedded in a host language file. This will only highlight Ragel statements. If you want host language highlighting then call the language-specific Ragel lexer. .. versionadded:: 1.1 """ name = 'Embedded Ragel' aliases = ['ragel-em'] filenames = ['*.rl'] tokens = { 'root': [ (r'(' + r'|'.join(( # keep host code in largest possible chunks r'[^%\'"/#]+', # exclude unsafe characters r'%(?=[^%]|$)', # a single % sign is okay, just not 2 of them # strings and comments may safely contain unsafe characters r'"(\\\\|\\[^\\]|[^"\\])*"', r"'(\\\\|\\[^\\]|[^'\\])*'", r'/\*(.|\n)*?\*/', # multi-line javadoc-style comment r'//.*$\n?', # single line comment r'\#.*$\n?', # ruby/ragel comment r'/(?!\*)(\\\\|\\[^\\]|[^/\\])*/', # regular expression # / is safe now that we've handled regex and javadoc comments r'/', )) + r')+', Other), # Single Line FSM. # Please don't put a quoted newline in a single line FSM. # That's just mean. It will break this. (r'(%%)(?![{%])(.*)($|;)(\n?)', bygroups(Punctuation, using(RagelLexer), Punctuation, Text)), # Multi Line FSM. (r'(%%%%|%%)\{', Punctuation, 'multi-line-fsm'), ], 'multi-line-fsm': [ (r'(' + r'|'.join(( # keep ragel code in largest possible chunks. r'(' + r'|'.join(( r'[^}\'"\[/#]', # exclude unsafe characters r'\}(?=[^%]|$)', # } is okay as long as it's not followed by % r'\}%(?=[^%]|$)', # ...well, one %'s okay, just not two... r'[^\\]\\[{}]', # ...and } is okay if it's escaped # allow / if it's preceded with one of these symbols # (ragel EOF actions) r'(>|\$|%|<|@|<>)/', # specifically allow regex followed immediately by * # so it doesn't get mistaken for a comment r'/(?!\*)(\\\\|\\[^\\]|[^/\\])*/\*', # allow / as long as it's not followed by another / or by a * r'/(?=[^/*]|$)', # We want to match as many of these as we can in one block. # Not sure if we need the + sign here, # does it help performance? )) + r')+', # strings and comments may safely contain unsafe characters r'"(\\\\|\\[^\\]|[^"\\])*"', r"'(\\\\|\\[^\\]|[^'\\])*'", r"\[(\\\\|\\[^\\]|[^\]\\])*\]", # square bracket literal r'/\*(.|\n)*?\*/', # multi-line javadoc-style comment r'//.*$\n?', # single line comment r'\#.*$\n?', # ruby/ragel comment )) + r')+', using(RagelLexer)), (r'\}%%', Punctuation, '#pop'), ] } def analyse_text(text): return '@LANG: indep' in text class RagelRubyLexer(DelegatingLexer): """ A lexer for `Ragel`_ in a Ruby host file. .. versionadded:: 1.1 """ name = 'Ragel in Ruby Host' aliases = ['ragel-ruby', 'ragel-rb'] filenames = ['*.rl'] def __init__(self, **options): super().__init__(RubyLexer, RagelEmbeddedLexer, **options) def analyse_text(text): return '@LANG: ruby' in text class RagelCLexer(DelegatingLexer): """ A lexer for `Ragel`_ in a C host file. .. versionadded:: 1.1 """ name = 'Ragel in C Host' aliases = ['ragel-c'] filenames = ['*.rl'] def __init__(self, **options): super().__init__(CLexer, RagelEmbeddedLexer, **options) def analyse_text(text): return '@LANG: c' in text class RagelDLexer(DelegatingLexer): """ A lexer for `Ragel`_ in a D host file. .. versionadded:: 1.1 """ name = 'Ragel in D Host' aliases = ['ragel-d'] filenames = ['*.rl'] def __init__(self, **options): super().__init__(DLexer, RagelEmbeddedLexer, **options) def analyse_text(text): return '@LANG: d' in text class RagelCppLexer(DelegatingLexer): """ A lexer for `Ragel`_ in a CPP host file. .. versionadded:: 1.1 """ name = 'Ragel in CPP Host' aliases = ['ragel-cpp'] filenames = ['*.rl'] def __init__(self, **options): super().__init__(CppLexer, RagelEmbeddedLexer, **options) def analyse_text(text): return '@LANG: c++' in text class RagelObjectiveCLexer(DelegatingLexer): """ A lexer for `Ragel`_ in an Objective C host file. .. versionadded:: 1.1 """ name = 'Ragel in Objective C Host' aliases = ['ragel-objc'] filenames = ['*.rl'] def __init__(self, **options): super().__init__(ObjectiveCLexer, RagelEmbeddedLexer, **options) def analyse_text(text): return '@LANG: objc' in text class RagelJavaLexer(DelegatingLexer): """ A lexer for `Ragel`_ in a Java host file. .. versionadded:: 1.1 """ name = 'Ragel in Java Host' aliases = ['ragel-java'] filenames = ['*.rl'] def __init__(self, **options): super().__init__(JavaLexer, RagelEmbeddedLexer, **options) def analyse_text(text): return '@LANG: java' in text class AntlrLexer(RegexLexer): """ Generic `ANTLR`_ Lexer. Should not be called directly, instead use DelegatingLexer for your target language. .. versionadded:: 1.1 .. _ANTLR: http://www.antlr.org/ """ name = 'ANTLR' aliases = ['antlr'] filenames = [] _id = r'[A-Za-z]\w*' _TOKEN_REF = r'[A-Z]\w*' _RULE_REF = r'[a-z]\w*' _STRING_LITERAL = r'\'(?:\\\\|\\\'|[^\']*)\'' _INT = r'[0-9]+' tokens = { 'whitespace': [ (r'\s+', Whitespace), ], 'comments': [ (r'//.*$', Comment), (r'/\*(.|\n)*?\*/', Comment), ], 'root': [ include('whitespace'), include('comments'), (r'(lexer|parser|tree)?(\s*)(grammar\b)(\s*)(' + _id + ')(;)', bygroups(Keyword, Whitespace, Keyword, Whitespace, Name.Class, Punctuation)), # optionsSpec (r'options\b', Keyword, 'options'), # tokensSpec (r'tokens\b', Keyword, 'tokens'), # attrScope (r'(scope)(\s*)(' + _id + r')(\s*)(\{)', bygroups(Keyword, Whitespace, Name.Variable, Whitespace, Punctuation), 'action'), # exception (r'(catch|finally)\b', Keyword, 'exception'), # action (r'(@' + _id + r')(\s*)(::)?(\s*)(' + _id + r')(\s*)(\{)', bygroups(Name.Label, Whitespace, Punctuation, Whitespace, Name.Label, Whitespace, Punctuation), 'action'), # rule (r'((?:protected|private|public|fragment)\b)?(\s*)(' + _id + ')(!)?', bygroups(Keyword, Whitespace, Name.Label, Punctuation), ('rule-alts', 'rule-prelims')), ], 'exception': [ (r'\n', Whitespace, '#pop'), (r'\s', Whitespace), include('comments'), (r'\[', Punctuation, 'nested-arg-action'), (r'\{', Punctuation, 'action'), ], 'rule-prelims': [ include('whitespace'), include('comments'), (r'returns\b', Keyword), (r'\[', Punctuation, 'nested-arg-action'), (r'\{', Punctuation, 'action'), # throwsSpec (r'(throws)(\s+)(' + _id + ')', bygroups(Keyword, Whitespace, Name.Label)), (r'(,)(\s*)(' + _id + ')', bygroups(Punctuation, Whitespace, Name.Label)), # Additional throws # optionsSpec (r'options\b', Keyword, 'options'), # ruleScopeSpec - scope followed by target language code or name of action # TODO finish implementing other possibilities for scope # L173 ANTLRv3.g from ANTLR book (r'(scope)(\s+)(\{)', bygroups(Keyword, Whitespace, Punctuation), 'action'), (r'(scope)(\s+)(' + _id + r')(\s*)(;)', bygroups(Keyword, Whitespace, Name.Label, Whitespace, Punctuation)), # ruleAction (r'(@' + _id + r')(\s*)(\{)', bygroups(Name.Label, Whitespace, Punctuation), 'action'), # finished prelims, go to rule alts! (r':', Punctuation, '#pop') ], 'rule-alts': [ include('whitespace'), include('comments'), # These might need to go in a separate 'block' state triggered by ( (r'options\b', Keyword, 'options'), (r':', Punctuation), # literals (r'"(\\\\|\\[^\\]|[^"\\])*"', String.Double), (r"'(\\\\|\\[^\\]|[^'\\])*'", String.Single), (r'<<([^>]|>[^>])>>', String), # identifiers # Tokens start with capital letter. (r'\$?[A-Z_]\w*', Name.Constant), # Rules start with small letter. (r'\$?[a-z_]\w*', Name.Variable), # operators (r'(\+|\||->|=>|=|\(|\)|\.\.|\.|\?|\*|\^|!|\#|~)', Operator), (r',', Punctuation), (r'\[', Punctuation, 'nested-arg-action'), (r'\{', Punctuation, 'action'), (r';', Punctuation, '#pop') ], 'tokens': [ include('whitespace'), include('comments'), (r'\{', Punctuation), (r'(' + _TOKEN_REF + r')(\s*)(=)?(\s*)(' + _STRING_LITERAL + r')?(\s*)(;)', bygroups(Name.Label, Whitespace, Punctuation, Whitespace, String, Whitespace, Punctuation)), (r'\}', Punctuation, '#pop'), ], 'options': [ include('whitespace'), include('comments'), (r'\{', Punctuation), (r'(' + _id + r')(\s*)(=)(\s*)(' + '|'.join((_id, _STRING_LITERAL, _INT, r'\*')) + r')(\s*)(;)', bygroups(Name.Variable, Whitespace, Punctuation, Whitespace, Text, Whitespace, Punctuation)), (r'\}', Punctuation, '#pop'), ], 'action': [ (r'(' + r'|'.join(( # keep host code in largest possible chunks r'[^${}\'"/\\]+', # exclude unsafe characters # strings and comments may safely contain unsafe characters r'"(\\\\|\\[^\\]|[^"\\])*"', r"'(\\\\|\\[^\\]|[^'\\])*'", r'//.*$\n?', # single line comment r'/\*(.|\n)*?\*/', # multi-line javadoc-style comment # regular expression: There's no reason for it to start # with a * and this stops confusion with comments. r'/(?!\*)(\\\\|\\[^\\]|[^/\\])*/', # backslashes are okay, as long as we are not backslashing a % r'\\(?!%)', # Now that we've handled regex and javadoc comments # it's safe to let / through. r'/', )) + r')+', Other), (r'(\\)(%)', bygroups(Punctuation, Other)), (r'(\$[a-zA-Z]+)(\.?)(text|value)?', bygroups(Name.Variable, Punctuation, Name.Property)), (r'\{', Punctuation, '#push'), (r'\}', Punctuation, '#pop'), ], 'nested-arg-action': [ (r'(' + r'|'.join(( # keep host code in largest possible chunks. r'[^$\[\]\'"/]+', # exclude unsafe characters # strings and comments may safely contain unsafe characters r'"(\\\\|\\[^\\]|[^"\\])*"', r"'(\\\\|\\[^\\]|[^'\\])*'", r'//.*$\n?', # single line comment r'/\*(.|\n)*?\*/', # multi-line javadoc-style comment # regular expression: There's no reason for it to start # with a * and this stops confusion with comments. r'/(?!\*)(\\\\|\\[^\\]|[^/\\])*/', # Now that we've handled regex and javadoc comments # it's safe to let / through. r'/', )) + r')+', Other), (r'\[', Punctuation, '#push'), (r'\]', Punctuation, '#pop'), (r'(\$[a-zA-Z]+)(\.?)(text|value)?', bygroups(Name.Variable, Punctuation, Name.Property)), (r'(\\\\|\\\]|\\\[|[^\[\]])+', Other), ] } def analyse_text(text): return re.search(r'^\s*grammar\s+[a-zA-Z0-9]+\s*;', text, re.M) # http://www.antlr.org/wiki/display/ANTLR3/Code+Generation+Targets class AntlrCppLexer(DelegatingLexer): """ `ANTLR`_ with CPP Target .. versionadded:: 1.1 """ name = 'ANTLR With CPP Target' aliases = ['antlr-cpp'] filenames = ['*.G', '*.g'] def __init__(self, **options): super().__init__(CppLexer, AntlrLexer, **options) def analyse_text(text): return AntlrLexer.analyse_text(text) and \ re.search(r'^\s*language\s*=\s*C\s*;', text, re.M) class AntlrObjectiveCLexer(DelegatingLexer): """ `ANTLR`_ with Objective-C Target .. versionadded:: 1.1 """ name = 'ANTLR With ObjectiveC Target' aliases = ['antlr-objc'] filenames = ['*.G', '*.g'] def __init__(self, **options): super().__init__(ObjectiveCLexer, AntlrLexer, **options) def analyse_text(text): return AntlrLexer.analyse_text(text) and \ re.search(r'^\s*language\s*=\s*ObjC\s*;', text) class AntlrCSharpLexer(DelegatingLexer): """ `ANTLR`_ with C# Target .. versionadded:: 1.1 """ name = 'ANTLR With C# Target' aliases = ['antlr-csharp', 'antlr-c#'] filenames = ['*.G', '*.g'] def __init__(self, **options): super().__init__(CSharpLexer, AntlrLexer, **options) def analyse_text(text): return AntlrLexer.analyse_text(text) and \ re.search(r'^\s*language\s*=\s*CSharp2\s*;', text, re.M) class AntlrPythonLexer(DelegatingLexer): """ `ANTLR`_ with Python Target .. versionadded:: 1.1 """ name = 'ANTLR With Python Target' aliases = ['antlr-python'] filenames = ['*.G', '*.g'] def __init__(self, **options): super().__init__(PythonLexer, AntlrLexer, **options) def analyse_text(text): return AntlrLexer.analyse_text(text) and \ re.search(r'^\s*language\s*=\s*Python\s*;', text, re.M) class AntlrJavaLexer(DelegatingLexer): """ `ANTLR`_ with Java Target .. versionadded:: 1. """ name = 'ANTLR With Java Target' aliases = ['antlr-java'] filenames = ['*.G', '*.g'] def __init__(self, **options): super().__init__(JavaLexer, AntlrLexer, **options) def analyse_text(text): # Antlr language is Java by default return AntlrLexer.analyse_text(text) and 0.9 class AntlrRubyLexer(DelegatingLexer): """ `ANTLR`_ with Ruby Target .. versionadded:: 1.1 """ name = 'ANTLR With Ruby Target' aliases = ['antlr-ruby', 'antlr-rb'] filenames = ['*.G', '*.g'] def __init__(self, **options): super().__init__(RubyLexer, AntlrLexer, **options) def analyse_text(text): return AntlrLexer.analyse_text(text) and \ re.search(r'^\s*language\s*=\s*Ruby\s*;', text, re.M) class AntlrPerlLexer(DelegatingLexer): """ `ANTLR`_ with Perl Target .. versionadded:: 1.1 """ name = 'ANTLR With Perl Target' aliases = ['antlr-perl'] filenames = ['*.G', '*.g'] def __init__(self, **options): super().__init__(PerlLexer, AntlrLexer, **options) def analyse_text(text): return AntlrLexer.analyse_text(text) and \ re.search(r'^\s*language\s*=\s*Perl5\s*;', text, re.M) class AntlrActionScriptLexer(DelegatingLexer): """ `ANTLR`_ with ActionScript Target .. versionadded:: 1.1 """ name = 'ANTLR With ActionScript Target' aliases = ['antlr-actionscript', 'antlr-as'] filenames = ['*.G', '*.g'] def __init__(self, **options): from pygments.lexers.actionscript import ActionScriptLexer super().__init__(ActionScriptLexer, AntlrLexer, **options) def analyse_text(text): return AntlrLexer.analyse_text(text) and \ re.search(r'^\s*language\s*=\s*ActionScript\s*;', text, re.M) class TreetopBaseLexer(RegexLexer): """ A base lexer for `Treetop <http://treetop.rubyforge.org/>`_ grammars. Not for direct use; use TreetopLexer instead. .. versionadded:: 1.6 """ tokens = { 'root': [ include('space'), (r'require[ \t]+[^\n\r]+[\n\r]', Other), (r'module\b', Keyword.Namespace, 'module'), (r'grammar\b', Keyword, 'grammar'), ], 'module': [ include('space'), include('end'), (r'module\b', Keyword, '#push'), (r'grammar\b', Keyword, 'grammar'), (r'[A-Z]\w*(?:::[A-Z]\w*)*', Name.Namespace), ], 'grammar': [ include('space'), include('end'), (r'rule\b', Keyword, 'rule'), (r'include\b', Keyword, 'include'), (r'[A-Z]\w*', Name), ], 'include': [ include('space'), (r'[A-Z]\w*(?:::[A-Z]\w*)*', Name.Class, '#pop'), ], 'rule': [ include('space'), include('end'), (r'"(\\\\|\\[^\\]|[^"\\])*"', String.Double), (r"'(\\\\|\\[^\\]|[^'\\])*'", String.Single), (r'([A-Za-z_]\w*)(:)', bygroups(Name.Label, Punctuation)), (r'[A-Za-z_]\w*', Name), (r'[()]', Punctuation), (r'[?+*/&!~]', Operator), (r'\[(?:\\.|\[:\^?[a-z]+:\]|[^\\\]])+\]', String.Regex), (r'([0-9]*)(\.\.)([0-9]*)', bygroups(Number.Integer, Operator, Number.Integer)), (r'(<)([^>]+)(>)', bygroups(Punctuation, Name.Class, Punctuation)), (r'\{', Punctuation, 'inline_module'), (r'\.', String.Regex), ], 'inline_module': [ (r'\{', Other, 'ruby'), (r'\}', Punctuation, '#pop'), (r'[^{}]+', Other), ], 'ruby': [ (r'\{', Other, '#push'), (r'\}', Other, '#pop'), (r'[^{}]+', Other), ], 'space': [ (r'[ \t\n\r]+', Whitespace), (r'#[^\n]*', Comment.Single), ], 'end': [ (r'end\b', Keyword, '#pop'), ], } class TreetopLexer(DelegatingLexer): """ A lexer for `Treetop <http://treetop.rubyforge.org/>`_ grammars. .. versionadded:: 1.6 """ name = 'Treetop' aliases = ['treetop'] filenames = ['*.treetop', '*.tt'] def __init__(self, **options): super().__init__(RubyLexer, TreetopBaseLexer, **options) class EbnfLexer(RegexLexer): """ Lexer for `ISO/IEC 14977 EBNF <http://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_Form>`_ grammars. .. versionadded:: 2.0 """ name = 'EBNF' aliases = ['ebnf'] filenames = ['*.ebnf'] mimetypes = ['text/x-ebnf'] tokens = { 'root': [ include('whitespace'), include('comment_start'), include('identifier'), (r'=', Operator, 'production'), ], 'production': [ include('whitespace'), include('comment_start'), include('identifier'), (r'"[^"]*"', String.Double), (r"'[^']*'", String.Single), (r'(\?[^?]*\?)', Name.Entity), (r'[\[\]{}(),|]', Punctuation), (r'-', Operator), (r';', Punctuation, '#pop'), (r'\.', Punctuation, '#pop'), ], 'whitespace': [ (r'\s+', Text), ], 'comment_start': [ (r'\(\*', Comment.Multiline, 'comment'), ], 'comment': [ (r'[^*)]', Comment.Multiline), include('comment_start'), (r'\*\)', Comment.Multiline, '#pop'), (r'[*)]', Comment.Multiline), ], 'identifier': [ (r'([a-zA-Z][\w \-]*)', Keyword), ], }
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