diff options
Diffstat (limited to 'Lib/shlex.py')
-rw-r--r-- | Lib/shlex.py | 132 |
1 files changed, 108 insertions, 24 deletions
diff --git a/Lib/shlex.py b/Lib/shlex.py index 7ffa79c..863e404 100644 --- a/Lib/shlex.py +++ b/Lib/shlex.py @@ -1,28 +1,51 @@ +# -*- coding: iso-8859-1 -*- """A lexical analyzer class for simple shell-like syntaxes.""" # 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.path import sys -__all__ = ["shlex"] +from types import StringTypes + +try: + from cStringIO import StringIO +except ImportError: + from StringIO import StringIO + +__all__ = ["shlex", "split"] class shlex: "A lexical analyzer class for simple shell-like syntaxes." - def __init__(self, instream=None, infile=None): + def __init__(self, instream=None, infile=None, posix=0): + if type(instream) in StringTypes: + 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 = '' self.commenters = '#' self.wordchars = ('abcdfeghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_') + if self.posix: + self.wordchars += ('ßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþÿ' + 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ') self.whitespace = ' \t\r\n' + self.whitespace_split = 0 self.quotes = '\'"' + self.escape = '\\' + self.escapedquotes = '"' self.state = ' ' self.pushback = [] self.lineno = 1 @@ -42,6 +65,8 @@ class shlex: def push_source(self, newstream, newfile=None): "Push an input source onto the lexer's input source stack." + if type(newstream) in StringTypes: + newstream = StringIO(newstream) self.filestack.insert(0, (self.infile, self.instream, self.lineno)) self.infile = newfile self.instream = newstream @@ -73,29 +98,31 @@ class shlex: # No pushback. Get a token. raw = self.read_token() # Handle inclusions - while raw == self.source: - spec = self.sourcehook(self.read_token()) - if spec: - (newfile, newstream) = spec - self.push_source(newstream, newfile) - raw = self.get_token() + 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 == "": + while raw == self.eof: if len(self.filestack) == 0: - return "" + return self.eof else: self.pop_source() raw = self.get_token() - # Neither inclusion nor EOF + # Neither inclusion nor EOF if self.debug >= 1: - if raw: + if raw != self.eof: print "shlex: token=" + `raw` else: print "shlex: token=EOF" return raw def read_token(self): - "Read a token from the input stream (no pushback or inclusions)" + quoted = 0 + escapedstate = ' ' while 1: nextchar = self.instream.read(1) if nextchar == '\n': @@ -113,35 +140,65 @@ class shlex: elif nextchar in self.whitespace: if self.debug >= 2: print "shlex: I see whitespace in whitespace state" - if self.token: + if self.token or (self.posix and quoted): 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: + escapedstate = 'a' + self.state = nextchar elif nextchar in self.wordchars: self.token = nextchar self.state = 'a' elif nextchar in self.quotes: - self.token = nextchar + if not self.posix: + self.token = nextchar self.state = nextchar + elif self.whitespace_split: + self.token = nextchar + self.state = 'a' else: self.token = nextchar - if self.token: + if self.token or (self.posix and quoted): break # emit current token else: continue elif self.state in self.quotes: - self.token = self.token + nextchar - if nextchar == self.state: - self.state = ' ' - break - elif not nextchar: # end of file + quoted = 1 + 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? raise ValueError, "No closing quotation" + if nextchar == self.state: + if not self.posix: + self.token = self.token + nextchar + self.state = ' ' + 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? + raise ValueError, "No escaped character" + # 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 @@ -150,14 +207,26 @@ class shlex: if self.debug >= 2: print "shlex: I see whitespace in word state" self.state = ' ' - if self.token: + if self.token or (self.posix and quoted): break # emit current token else: continue elif nextchar in self.commenters: self.instream.readline() self.lineno = self.lineno + 1 - elif nextchar in self.wordchars or nextchar in self.quotes: + if self.posix: + self.state = ' ' + if self.token or (self.posix and quoted): + 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 = [nextchar] + self.pushback @@ -170,6 +239,8 @@ class shlex: 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=" + `result` @@ -182,7 +253,7 @@ class shlex: if newfile[0] == '"': newfile = newfile[1:-1] # This implements cpp-like semantics for relative-path inclusion. - if type(self.infile) == type("") and not os.path.isabs(newfile): + if type(self.infile) in StringTypes and not os.path.isabs(newfile): newfile = os.path.join(os.path.dirname(self.infile), newfile) return (newfile, open(newfile, "r")) @@ -194,6 +265,19 @@ class shlex: lineno = self.lineno return "\"%s\", line %d: " % (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, posix=1, spaces=1): + lex = shlex(s, posix=posix) + lex.whitespace_split = spaces + return list(lex) if __name__ == '__main__': if len(sys.argv) == 1: |