Use pyparsing's locatedExpr instead of our custom helper

Our locatedExpr helper was suggested by the author of pyparsing as a
way to get the location of a token. He added the feature to pyparsing
shortly after (version 2.0.2 more than 5 years ago), so there is no
reason to carry our own locatedExpr implementation.

For more context, see:

  http://stackoverflow.com/questions/18706631/pyparsing-get-token-location-in-results-name

Signed-off-by: Christophe Vu-Brugier <cvubrugier@fastmail.fm>

configshell/shell.py

@@ -18,8 +18,9 @@
 import os
 import six
 import sys
-from pyparsing import (alphanums, Empty, Group, OneOrMore, Optional,
-                       ParseResults, Regex, Suppress, Word)
+from pyparsing import (alphanums, Empty, Group, locatedExpr,
+                       OneOrMore, Optional, ParseResults, Regex,
+                       Suppress, Word)
 
 from . import console
 from . import log
@@ -48,7 +49,7 @@ def handle_sigint(signum, frame):
     tty=True
 else:
     tty=False
-    
+
     # remember the original setting
     oldTerm = os.environ.get('TERM')
     os.environ['TERM'] = ''
@@ -59,12 +60,6 @@ def handle_sigint(signum, frame):
     if oldTerm != None:
         os.environ['TERM'] = oldTerm
     del oldTerm
-
-# Pyparsing helper to group the location of a token and its value
-# http://stackoverflow.com/questions/18706631/pyparsing-get-token-location-in-results-name
-locator = Empty().setParseAction(lambda s, l, t: l)
-def locatedExpr(expr):
-    return Group(locator('location') + expr('value'))
 
 class ConfigShell(object):
     '''
@@ -608,13 +603,13 @@ def _complete(self, text, state):
                     current_token = 'pparam'
                 elif 'x' in [x.value for x in parse_results.kparams]:
                     current_token = 'kparam'
-            elif path and beg == parse_results.path.location:
+            elif path and beg == parse_results.path.locn_start:
                 current_token = 'path'
-            elif command and beg == parse_results.command.location:
+            elif command and beg == parse_results.command.locn_start:
                 current_token = 'command'
-            elif pparams and beg in [p.location for p in parse_results.pparams]:
+            elif pparams and beg in [p.locn_start for p in parse_results.pparams]:
                 current_token = 'pparam'
-            elif kparams and beg in [k.location for k in parse_results.kparams]:
+            elif kparams and beg in [k.locn_start for k in parse_results.kparams]:
                 current_token = 'kparam'
 
             self._current_completions = \

setup.py

@@ -42,7 +42,7 @@
     url = 'http://github.com/open-iscsi/configshell-fb',
     packages = ['configshell', 'configshell_fb'],
     install_requires = [
-        'pyparsing',
+        'pyparsing >= 2.0.2',
         'six',
         'urwid',
     ],