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-"""
-A lexical analyzer class for simple shell-like syntaxes.
-
-Tweaked for the specific needs of parsing poezio input.
-
-"""
-
-# 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.
-
-import os
-import re
-import sys
-from collections import deque
-
-from io import StringIO
-
-__all__ = ["shlex", "split", "quote"]
-
-class shlex:
- """
- A custom version of the shlex in the stdlib to yield more information
- """
- def __init__(self, instream=None, infile=None, posix=True):
- 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
- self.eof = ''
- self.commenters = ''
- self.wordchars = ('abcdfeghijklmnopqrstuvwxyz'
- 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_')
- if self.posix:
- self.wordchars += ('ßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ'
- 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ')
- self.whitespace = ' \t\r\n'
- self.whitespace_split = True
- self.quotes = '"'
- self.escape = '\\'
- self.escapedquotes = '"'
- self.state = ' '
- self.pushback = deque()
- self.lineno = 1
- self.debug = 0
- self.token = ''
- self.filestack = deque()
- self.source = None
- if self.debug:
- print('shlex: reading from %s, line %d' \
- % (self.instream, self.lineno))
-
- def push_token(self, tok):
- "Push a token onto the stack popped by the get_token method"
- if self.debug >= 1:
- print("shlex: pushing token " + repr(tok))
- self.pushback.appendleft(tok)
-
- def push_source(self, newstream, newfile=None):
- "Push an input source onto the lexer's input source stack."
- 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('shlex: pushing to file %s' % (self.infile,))
- else:
- print('shlex: pushing to stream %s' % (self.instream,))
-
- def pop_source(self):
- "Pop the input source stack."
- self.instream.close()
- (self.infile, self.instream, self.lineno) = self.filestack.popleft()
- if self.debug:
- print('shlex: popping to %s, line %d' \
- % (self.instream, self.lineno))
- self.state = ' '
-
- def get_token(self):
- "Get a token from the input stream (or from stack if it's nonempty)"
- if self.pushback:
- tok = self.pushback.popleft()
- if self.debug >= 1:
- print("shlex: popping token " + repr(tok))
- return tok
- # No pushback. Get a token.
- start, end, raw = self.read_token()
- return start, end, raw
-
- def read_token(self):
- quoted = False
- escapedstate = ' '
- token_start = 0
- token_end = -1
- while True:
- nextchar = self.instream.read(1)
- if nextchar == '\n':
- self.lineno = self.lineno + 1
- if self.debug >= 3:
- print("shlex: in state", repr(self.state), \
- "I see character:", repr(nextchar))
- if self.state is None:
- self.token = '' # past end of file
- token_end = self.instream.tell()
- break
- elif self.state == ' ':
- if not nextchar:
- self.state = None # end of file
- token_end = self.instream.tell()
- break
- elif nextchar in self.whitespace:
- if self.debug >= 2:
- print("shlex: I see whitespace in whitespace state")
- if self.token or (self.posix and quoted):
- token_end = self.instream.tell() - 1
- break # emit current token
- else:
- continue
- elif nextchar in self.commenters:
- self.instream.readline()
- self.lineno = self.lineno + 1
- elif self.posix and nextchar in self.escape:
- token_start = self.instream.tell() - 1
- escapedstate = 'a'
- self.state = nextchar
- elif nextchar in self.wordchars:
- token_start = self.instream.tell() - 1
- self.token = nextchar
- self.state = 'a'
- elif nextchar in self.quotes:
- token_start = self.instream.tell() - 1
- self.state = nextchar
- elif self.whitespace_split:
- token_start = self.instream.tell() - 1
- self.token = nextchar
- self.state = 'a'
- else:
- token_start = self.instream.tell() - 1
- self.token = nextchar
- if self.token or (self.posix and quoted):
- token_end = self.instream.tell() - 1
- break # emit current token
- else:
- continue
- elif self.state in self.quotes:
- quoted = True
- if not nextchar: # end of file
- if self.debug >= 2:
- print("shlex: I see EOF in quotes state")
- # XXX what error should be raised here?
- token_end = self.instream.tell()
- break
- if nextchar == self.state:
- if not self.posix:
- self.token = self.token + nextchar
- self.state = ' '
- token_end = self.instream.tell()
- break
- else:
- self.state = 'a'
- elif self.posix and nextchar in self.escape and \
- self.state in self.escapedquotes:
- escapedstate = self.state
- self.state = nextchar
- else:
- self.token = self.token + nextchar
- elif self.state in self.escape:
- if not nextchar: # end of file
- if self.debug >= 2:
- print("shlex: I see EOF in escape state")
- # XXX what error should be raised here?
- token_end = self.instream.tell()
- break
- # 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.token + self.state
- self.token = self.token + nextchar
- self.state = escapedstate
- elif self.state == 'a':
- if not nextchar:
- self.state = None # end of file
- token_end = self.instream.tell()
- break
- elif nextchar in self.whitespace:
- if self.debug >= 2:
- print("shlex: I see whitespace in word state")
- self.state = ' '
- if self.token or (self.posix and quoted):
- token_end = self.instream.tell() - 1
- break # emit current token
- else:
- continue
- elif self.posix and nextchar in self.quotes:
- self.state = nextchar
- elif self.posix and nextchar in self.escape:
- escapedstate = 'a'
- self.state = nextchar
- elif nextchar in self.wordchars or nextchar in self.quotes \
- or self.whitespace_split:
- self.token = self.token + nextchar
- else:
- self.pushback.appendleft(nextchar)
- if self.debug >= 2:
- print("shlex: I see punctuation in word state")
- self.state = ' '
- if self.token:
- token_end = self.instream.tell()
- break # emit current token
- else:
- continue
- result = self.token
- self.token = ''
- if self.posix and not quoted and result == '':
- result = None
- if self.debug > 1:
- if result:
- print("shlex: raw token=" + repr(result))
- else:
- print("shlex: raw token=EOF")
- return (token_start, token_end, result)
-
- def sourcehook(self, newfile):
- "Hook called on a filename to be sourced."
- if newfile[0] == '"':
- 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, "r"))
-
- def error_leader(self, infile=None, lineno=None):
- "Emit a C-compiler-like, Emacs-friendly error-message leader."
- if infile is None:
- infile = self.infile
- if lineno is None:
- lineno = self.lineno
- return "\"%s\", line %d: " % (infile, lineno)
-
- def __iter__(self):
- return self
-
- def __next__(self):
- token = self.get_token()
- if token and token[0] == self.eof:
- raise StopIteration
- return token
-
-def split(s, comments=False, posix=True):
- lex = shlex(s, posix=posix)
- lex.whitespace_split = True
- if not comments:
- lex.commenters = ''
- return list(lex)
-
-
-_find_unsafe = re.compile(r'[^\w@%+=:,./-]', re.ASCII).search
-
-def quote(s):
- """Return a shell-escaped version of the string *s*."""
- if not s:
- return "''"
- if _find_unsafe(s) is None:
- return s
-
- # use single quotes, and put single quotes into double quotes
- # the string $'b is then quoted as '$'"'"'b'
- return "'" + s.replace("'", "'\"'\"'") + "'"
-
-
-if __name__ == '__main__':
- lexer = shlex(instream=sys.argv[1])
- while 1:
- tt = lexer.get_token()
- if tt:
- print("Token: " + repr(tt))
- else:
- break
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