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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;A lexical analyzer class for simple shell-like syntaxes.&quot;&quot;&quot;

# Module and documentation by Eric S. Raymond, 21 Dec 1998
# Input stacking and error message cleanup added by ESR, March 2000
# push_source() and pop_source() made explicit by ESR, January 2001.
# Posix compliance, split(), string arguments, and
# iterator interface by Gustavo Niemeyer, April 2003.
# changes to tokenize more like Posix shells by Vinay Sajip, July 2016.

import os
import re
import sys
from collections import deque

from io import StringIO

__all__ = [&quot;shlex&quot;, &quot;split&quot;, &quot;quote&quot;, &quot;join&quot;]

class shlex:
    &quot;A lexical analyzer class for simple shell-like syntaxes.&quot;
    def __init__(self, instream=None, infile=None, posix=False,
                 punctuation_chars=False):
        if isinstance(instream, str):
            instream = StringIO(instream)
        if instream is not None:
            self.instream = instream
            self.infile = infile
        else:
            self.instream = sys.stdin
            self.infile = None
        self.posix = posix
        if posix:
            self.eof = None
        else:
            self.eof = &#039;&#039;
        self.commenters = &#039;#&#039;
        self.wordchars = (&#039;abcdfeghijklmnopqrstuvwxyz&#039;
                          &#039;ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_&#039;)
        if self.posix:
            self.wordchars += (&#039;ßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ&#039;
                               &#039;ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ&#039;)
        self.whitespace = &#039; \t\r\n&#039;
        self.whitespace_split = False
        self.quotes = &#039;\&#039;&quot;&#039;
        self.escape = &#039;\\&#039;
        self.escapedquotes = &#039;&quot;&#039;
        self.state = &#039; &#039;
        self.pushback = deque()
        self.lineno = 1
        self.debug = 0
        self.token = &#039;&#039;
        self.filestack = deque()
        self.source = None
        if not punctuation_chars:
            punctuation_chars = &#039;&#039;
        elif punctuation_chars is True:
            punctuation_chars = &#039;();&lt;&gt;|&amp;&#039;
        self._punctuation_chars = punctuation_chars
        if punctuation_chars:
            # _pushback_chars is a push back queue used by lookahead logic
            self._pushback_chars = deque()
            # these chars added because allowed in file names, args, wildcards
            self.wordchars += &#039;~-./*?=&#039;
            #remove any punctuation chars from wordchars
            t = self.wordchars.maketrans(dict.fromkeys(punctuation_chars))
            self.wordchars = self.wordchars.translate(t)

    @property
    def punctuation_chars(self):
        return self._punctuation_chars

    def push_token(self, tok):
        &quot;Push a token onto the stack popped by the get_token method&quot;
        if self.debug &gt;= 1:
            print(&quot;shlex: pushing token &quot; + repr(tok))
        self.pushback.appendleft(tok)

    def push_source(self, newstream, newfile=None):
        &quot;Push an input source onto the lexer&#039;s input source stack.&quot;
        if isinstance(newstream, str):
            newstream = StringIO(newstream)
        self.filestack.appendleft((self.infile, self.instream, self.lineno))
        self.infile = newfile
        self.instream = newstream
        self.lineno = 1
        if self.debug:
            if newfile is not None:
                print(&#039;shlex: pushing to file %s&#039; % (self.infile,))
            else:
                print(&#039;shlex: pushing to stream %s&#039; % (self.instream,))

    def pop_source(self):
        &quot;Pop the input source stack.&quot;
        self.instream.close()
        (self.infile, self.instream, self.lineno) = self.filestack.popleft()
        if self.debug:
            print(&#039;shlex: popping to %s, line %d&#039; \
                  % (self.instream, self.lineno))
        self.state = &#039; &#039;

    def get_token(self):
        &quot;Get a token from the input stream (or from stack if it&#039;s nonempty)&quot;
        if self.pushback:
            tok = self.pushback.popleft()
            if self.debug &gt;= 1:
                print(&quot;shlex: popping token &quot; + repr(tok))
            return tok
        # No pushback.  Get a token.
        raw = self.read_token()
        # Handle inclusions
        if self.source is not None:
            while raw == self.source:
                spec = self.sourcehook(self.read_token())
                if spec:
                    (newfile, newstream) = spec
                    self.push_source(newstream, newfile)
                raw = self.get_token()
        # Maybe we got EOF instead?
        while raw == self.eof:
            if not self.filestack:
                return self.eof
            else:
                self.pop_source()
                raw = self.get_token()
        # Neither inclusion nor EOF
        if self.debug &gt;= 1:
            if raw != self.eof:
                print(&quot;shlex: token=&quot; + repr(raw))
            else:
                print(&quot;shlex: token=EOF&quot;)
        return raw

    def read_token(self):
        quoted = False
        escapedstate = &#039; &#039;
        while True:
            if self.punctuation_chars and self._pushback_chars:
                nextchar = self._pushback_chars.pop()
            else:
                nextchar = self.instream.read(1)
            if nextchar == &#039;\n&#039;:
                self.lineno += 1
            if self.debug &gt;= 3:
                print(&quot;shlex: in state %r I see character: %r&quot; % (self.state,
                                                                  nextchar))
            if self.state is None:
                self.token = &#039;&#039;        # past end of file
                break
            elif self.state == &#039; &#039;:
                if not nextchar:
                    self.state = None  # end of file
                    break
                elif nextchar in self.whitespace:
                    if self.debug &gt;= 2:
                        print(&quot;shlex: I see whitespace in whitespace state&quot;)
                    if self.token or (self.posix and quoted):
                        break   # emit current token
                    else:
                        continue
                elif nextchar in self.commenters:
                    self.instream.readline()
                    self.lineno += 1
                elif self.posix and nextchar in self.escape:
                    escapedstate = &#039;a&#039;
                    self.state = nextchar
                elif nextchar in self.wordchars:
                    self.token = nextchar
                    self.state = &#039;a&#039;
                elif nextchar in self.punctuation_chars:
                    self.token = nextchar
                    self.state = &#039;c&#039;
                elif nextchar in self.quotes:
                    if not self.posix:
                        self.token = nextchar
                    self.state = nextchar
                elif self.whitespace_split:
                    self.token = nextchar
                    self.state = &#039;a&#039;
                else:
                    self.token = nextchar
                    if self.token or (self.posix and quoted):
                        break   # emit current token
                    else:
                        continue
            elif self.state in self.quotes:
                quoted = True
                if not nextchar:      # end of file
                    if self.debug &gt;= 2:
                        print(&quot;shlex: I see EOF in quotes state&quot;)
                    # XXX what error should be raised here?
                    raise ValueError(&quot;No closing quotation&quot;)
                if nextchar == self.state:
                    if not self.posix:
                        self.token += nextchar
                        self.state = &#039; &#039;
                        break
                    else:
                        self.state = &#039;a&#039;
                elif (self.posix and nextchar in self.escape and self.state
                      in self.escapedquotes):
                    escapedstate = self.state
                    self.state = nextchar
                else:
                    self.token += nextchar
            elif self.state in self.escape:
                if not nextchar:      # end of file
                    if self.debug &gt;= 2:
                        print(&quot;shlex: I see EOF in escape state&quot;)
                    # XXX what error should be raised here?
                    raise ValueError(&quot;No escaped character&quot;)
                # In posix shells, only the quote itself or the escape
                # character may be escaped within quotes.
                if (escapedstate in self.quotes and
                        nextchar != self.state and nextchar != escapedstate):
                    self.token += self.state
                self.token += nextchar
                self.state = escapedstate
            elif self.state in (&#039;a&#039;, &#039;c&#039;):
                if not nextchar:
                    self.state = None   # end of file
                    break
                elif nextchar in self.whitespace:
                    if self.debug &gt;= 2:
                        print(&quot;shlex: I see whitespace in word state&quot;)
                    self.state = &#039; &#039;
                    if self.token or (self.posix and quoted):
                        break   # emit current token
                    else:
                        continue
                elif nextchar in self.commenters:
                    self.instream.readline()
                    self.lineno += 1
                    if self.posix:
                        self.state = &#039; &#039;
                        if self.token or (self.posix and quoted):
                            break   # emit current token
                        else:
                            continue
                elif self.state == &#039;c&#039;:
                    if nextchar in self.punctuation_chars:
                        self.token += nextchar
                    else:
                        if nextchar not in self.whitespace:
                            self._pushback_chars.append(nextchar)
                        self.state = &#039; &#039;
                        break
                elif self.posix and nextchar in self.quotes:
                    self.state = nextchar
                elif self.posix and nextchar in self.escape:
                    escapedstate = &#039;a&#039;
                    self.state = nextchar
                elif (nextchar in self.wordchars or nextchar in self.quotes
                      or (self.whitespace_split and
                          nextchar not in self.punctuation_chars)):
                    self.token += nextchar
                else:
                    if self.punctuation_chars:
                        self._pushback_chars.append(nextchar)
                    else:
                        self.pushback.appendleft(nextchar)
                    if self.debug &gt;= 2:
                        print(&quot;shlex: I see punctuation in word state&quot;)
                    self.state = &#039; &#039;
                    if self.token or (self.posix and quoted):
                        break   # emit current token
                    else:
                        continue
        result = self.token
        self.token = &#039;&#039;
        if self.posix and not quoted and result == &#039;&#039;:
            result = None
        if self.debug &gt; 1:
            if result:
                print(&quot;shlex: raw token=&quot; + repr(result))
            else:
                print(&quot;shlex: raw token=EOF&quot;)
        return result

    def sourcehook(self, newfile):
        &quot;Hook called on a filename to be sourced.&quot;
        if newfile[0] == &#039;&quot;&#039;:
            newfile = newfile[1:-1]
        # This implements cpp-like semantics for relative-path inclusion.
        if isinstance(self.infile, str) and not os.path.isabs(newfile):
            newfile = os.path.join(os.path.dirname(self.infile), newfile)
        return (newfile, open(newfile, &quot;r&quot;))

    def error_leader(self, infile=None, lineno=None):
        &quot;Emit a C-compiler-like, Emacs-friendly error-message leader.&quot;
        if infile is None:
            infile = self.infile
        if lineno is None:
            lineno = self.lineno
        return &quot;\&quot;%s\&quot;, line %d: &quot; % (infile, lineno)

    def __iter__(self):
        return self

    def __next__(self):
        token = self.get_token()
        if token == self.eof:
            raise StopIteration
        return token

def split(s, comments=False, posix=True):
    &quot;&quot;&quot;Split the string *s* using shell-like syntax.&quot;&quot;&quot;
    if s is None:
        raise ValueError(&quot;s argument must not be None&quot;)
    lex = shlex(s, posix=posix)
    lex.whitespace_split = True
    if not comments:
        lex.commenters = &#039;&#039;
    return list(lex)


def join(split_command):
    &quot;&quot;&quot;Return a shell-escaped string from *split_command*.&quot;&quot;&quot;
    return &#039; &#039;.join(quote(arg) for arg in split_command)


_find_unsafe = re.compile(r&#039;[^\w@%+=:,./-]&#039;, re.ASCII).search

def quote(s):
    &quot;&quot;&quot;Return a shell-escaped version of the string *s*.&quot;&quot;&quot;
    if not s:
        return &quot;&#039;&#039;&quot;
    if _find_unsafe(s) is None:
        return s

    # use single quotes, and put single quotes into double quotes
    # the string $&#039;b is then quoted as &#039;$&#039;&quot;&#039;&quot;&#039;b&#039;
    return &quot;&#039;&quot; + s.replace(&quot;&#039;&quot;, &quot;&#039;\&quot;&#039;\&quot;&#039;&quot;) + &quot;&#039;&quot;


def _print_tokens(lexer):
    while tt := lexer.get_token():
        print(&quot;Token: &quot; + repr(tt))

if __name__ == &#039;__main__&#039;:
    if len(sys.argv) == 1:
        _print_tokens(shlex())
    else:
        fn = sys.argv[1]
        with open(fn) as f:
            _print_tokens(shlex(f, fn))
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