Simplify line info code.

IPython/core/splitinput.py

@@ -1,142 +1,137 b''
 # encoding: utf-8
 """
 Simple utility for splitting user input. This is used by both inputsplitter and
 prefilter.
 
 Authors:
 
 * Brian Granger
 * Fernando Perez
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import re
 import sys
 
 from IPython.utils import py3compat
 from IPython.utils.encoding import get_stream_enc
 
 #-----------------------------------------------------------------------------
 # Main function
 #-----------------------------------------------------------------------------
 
 # RegExp for splitting line contents into pre-char//first word-method//rest.
 # For clarity, each group in on one line.
 
 # WARNING: update the regexp if the escapes in interactiveshell are changed, as
 # they are hardwired in.
 
 # Although it's not solely driven by the regex, note that:
 # ,;/% only trigger if they are the first character on the line
 # ! and !! trigger if they are first char(s) *or* follow an indent
 # ? triggers as first or last char.
 
 line_split = re.compile("""
              ^(\s*)               # any leading space
              ([,;/%]|!!?|\?\??)?  # escape character or characters
              \s*(%?[\w\.\*]*)     # function/method, possibly with leading %
                                   # to correctly treat things like '?%magic'
              (.*?$|$)             # rest of line
              """, re.VERBOSE)
 
 
 def split_user_input(line, pattern=None):
     """Split user input into initial whitespace, escape character, function part
     and the rest.
     """
     # We need to ensure that the rest of this routine deals only with unicode
     encoding = get_stream_enc(sys.stdin, 'utf-8')
     line = py3compat.cast_unicode(line, encoding)
 
     if pattern is None:
         pattern = line_split
     match = pattern.match(line)
     if not match:
         # print "match failed for line '%s'" % line
         try:
             ifun, the_rest = line.split(None,1)
         except ValueError:
             # print "split failed for line '%s'" % line
             ifun, the_rest = line, u''
         pre = re.match('^(\s*)(.*)',line).groups()[0]
         esc = ""
     else:
         pre, esc, ifun, the_rest = match.groups()
 
     #print 'line:<%s>' % line # dbg
     #print 'pre <%s> ifun <%s> rest <%s>' % (pre,ifun.strip(),the_rest) # dbg
     return pre, esc or '', ifun.strip(), the_rest.lstrip()
 
 
 class LineInfo(object):
     """A single line of input and associated info.
 
     Includes the following as properties:
 
     line
       The original, raw line
 
     continue_prompt
       Is this line a continuation in a sequence of multiline input?
 
     pre
       Any leading whitespace.
 
     esc
       The escape character(s) in pre or the empty string if there isn't one.
       Note that '!!' and '??' are possible values for esc. Otherwise it will
       always be a single character.
 
     ifun
       The 'function part', which is basically the maximal initial sequence
       of valid python identifiers and the '.' character. This is what is
       checked for alias and magic transformations, used for auto-calling,
       etc. In contrast to Python identifiers, it may start with "%" and contain
       "*".
 
     the_rest
       Everything else on the line.
     """
     def __init__(self, line, continue_prompt=False):
         self.line            = line
         self.continue_prompt = continue_prompt
         self.pre, self.esc, self.ifun, self.the_rest = split_user_input(line)
 
         self.pre_char       = self.pre.strip()
         if self.pre_char:
             self.pre_whitespace = '' # No whitespace allowd before esc chars
         else:
             self.pre_whitespace = self.pre
 
-        self._oinfo = None
-
     def ofind(self, ip):
         """Do a full, attribute-walking lookup of the ifun in the various
         namespaces for the given IPython InteractiveShell instance.
 
         Return a dict with keys: {found, obj, ospace, ismagic}
 
         Note: can cause state changes because of calling getattr, but should
         only be run if autocall is on and if the line hasn't matched any
         other, less dangerous handlers.
 
         Does cache the results of the call, so can be called multiple times
         without worrying about *further* damaging state.
         """
-        if not self._oinfo:
-            # ip.shell._ofind is actually on the Magic class!
-            self._oinfo = ip._ofind(self.ifun)
-        return self._oinfo
+        return ip._ofind(self.ifun)
 
     def __str__(self):
         return "LineInfo [%s|%s|%s|%s]" %(self.pre, self.esc, self.ifun, self.the_rest)