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| author | Fred Drake <fdrake@acm.org> | 2000-07-03 09:56:23 (GMT) |
|---|---|---|
| committer | Fred Drake <fdrake@acm.org> | 2000-07-03 09:56:23 (GMT) |
| commit | 52dc76c81fffa709fae35af92538723d23ad18d6 (patch) | |
| tree | ca026ec14dda2005023bafa48784151841c50ec5 /Lib/shlex.py | |
| parent | 353aaadd9be62e2fa075a1da5771b31d1f0e7046 (diff) | |
| download | cpython-52dc76c81fffa709fae35af92538723d23ad18d6.zip cpython-52dc76c81fffa709fae35af92538723d23ad18d6.tar.gz cpython-52dc76c81fffa709fae35af92538723d23ad18d6.tar.bz2 | |
Eric S. Raymond <esr@thyrsus.com>:
This patch implements relative-path semantics for the "source" facility resembling
those of cpp(1), documents the change, and improves the shlex test main to
make it easier to test this feature. Along the way, it fixes a name error
in the existing docs.
[Additional documentation markup changes for consistency by FLD.]
Diffstat (limited to 'Lib/shlex.py')
| -rw-r--r-- | Lib/shlex.py | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/Lib/shlex.py b/Lib/shlex.py index 575fc35..876dcdf 100644 --- a/Lib/shlex.py +++ b/Lib/shlex.py @@ -3,8 +3,10 @@ # Module and documentation by Eric S. Raymond, 21 Dec 1998 # Input stacking and error message cleanup added by ESR, March 2000 +import os.path import sys + class shlex: "A lexical analyzer class for simple shell-like syntaxes." def __init__(self, instream=None, infile=None): @@ -26,7 +28,8 @@ class shlex: self.filestack = [] self.source = None if self.debug: - print 'shlex: reading from %s, line %d' % (self.instream,self.lineno) + 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" @@ -47,7 +50,7 @@ class shlex: # Handle inclusions while raw == self.source: (newfile, newstream) = self.sourcehook(self.read_token()) - self.filestack = [(self.infile,self.instream,self.lineno)] + self.filestack + self.filestack.insert(0, (self.infile, self.instream, self.lineno)) self.infile = newfile self.instream = newstream self.lineno = 1 @@ -63,7 +66,8 @@ class shlex: (self.infile, self.instream, self.lineno) = self.filestack[0] self.filestack = self.filestack[1:] if self.debug: - print 'shlex: popping to %s, line %d' % (self.instream, self.lineno) + print 'shlex: popping to %s, line %d' \ + % (self.instream, self.lineno) self.state = ' ' raw = self.get_token() # Neither inclusion nor EOF @@ -82,7 +86,8 @@ class shlex: if nextchar == '\n': self.lineno = self.lineno + 1 if self.debug >= 3: - print "shlex: in state " + repr(self.state) + " I see character: " + repr(nextchar) + print "shlex: in state", repr(self.state), \ + "I see character:", repr(nextchar) if self.state == None: self.token = ''; # past end of file break @@ -156,6 +161,9 @@ class shlex: "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 type(self.infile) == type("") 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): @@ -166,12 +174,16 @@ class shlex: lineno = self.lineno return "\"%s\", line %d: " % (infile, lineno) -if __name__ == '__main__': - lexer = shlex() +if __name__ == '__main__': + if len(sys.argv) == 1: + lexer = shlex() + else: + file = sys.argv[1] + lexer = shlex(open(file), file) while 1: tt = lexer.get_token() - print "Token: " + repr(tt) - if not tt: + if tt: + print "Token: " + repr(tt) + else: break - |