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# encoding: utf-8
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"""
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Simple utility for splitting user input.
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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) 2008-2009 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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#-----------------------------------------------------------------------------
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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 they
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# 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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# The three parts of the regex are:
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# 1) pre: pre_char *or* initial whitespace
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# 2) ifun: first word/method (mix of \w and '.')
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# 3) the_rest: rest of line (separated from ifun by space if non-empty)
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line_split = re.compile(r'^([,;/%?]|!!?|\s*)'
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r'\s*([\w\.]+)'
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r'(\s+.*$|$)')
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# r'[\w\.]+'
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# r'\s*=\s*%.*'
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def split_user_input(line, pattern=None):
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"""Split user input into pre-char/whitespace, function part and rest.
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This is currently handles lines with '=' in them in a very inconsistent
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manner.
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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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if type(line)==str:
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codec = sys.stdin.encoding
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if codec is None:
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codec = 'utf-8'
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line = line.decode(codec)
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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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else:
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pre,ifun,the_rest = match.groups()
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# ifun has to be a valid python identifier, so it better encode into
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# ascii. We do still make it a unicode string so that we consistently
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# return unicode, but it will be one that is guaranteed to be pure ascii
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try:
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ifun = unicode(ifun.encode('ascii'))
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except UnicodeEncodeError:
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the_rest = ifun + u' ' + the_rest
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ifun = u''
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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, ifun.strip(), the_rest.lstrip()
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