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