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-rw-r--r--Lib/shlex.py132
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: