upstream/ipython Files · IPython/utils/strdispatch.py

Fully refactored subprocess handling on all platforms....

Fully refactored subprocess handling on all platforms. Now we have all process-related code in utils.process, which itself imports from platform-specific files as needed. On posix, we have reliable asynchronous delivery of stdout and stderr, and on win32 at least we have the basics that subprocess.py provides, since pexpect is not available. We also now support robust killing of subprocesses that may capture SIGINT: one SIGINT on our end is sent to the subprocess, but then we kill it, to prevent a rogue subprocess from hijacking the ipython console. Note that on posix, we now depend on pexpect, but we ship our own copy to users which we'll use if there's no system pexpect installed. UNC path handling for windows was implemented as a context manager called AvoidUNCPath.

Brian Granger - - Load All Authors

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      """String dispatch class to match regexps and dispatch commands.

      """

      # Stdlib imports

      import re

      # Our own modules

      from IPython.core.hooks import CommandChainDispatcher

      # Code begins

      class StrDispatch(object):

          """Dispatch (lookup) a set of strings / regexps for match.

          Example:

          >>> dis = StrDispatch()

          >>> dis.add_s('hei',34, priority = 4)

          >>> dis.add_s('hei',123, priority = 2)

          >>> dis.add_re('h.i', 686)

          >>> print list(dis.flat_matches('hei'))

          [123, 34, 686]

          """

          def __init__(self):

              self.strs = {}

              self.regexs = {}

          def add_s(self, s, obj, priority= 0 ):

              """ Adds a target 'string' for dispatching """

              chain = self.strs.get(s, CommandChainDispatcher())

              chain.add(obj,priority)

              self.strs[s] = chain

          def add_re(self, regex, obj, priority= 0 ):

              """ Adds a target regexp for dispatching """

              chain = self.regexs.get(regex, CommandChainDispatcher())

              chain.add(obj,priority)

              self.regexs[regex] = chain

          def dispatch(self, key):

              """ Get a seq of Commandchain objects that match key """

              if key in self.strs:

                  yield self.strs[key]

              for r, obj in self.regexs.items():

                  if re.match(r, key):

                      yield obj

                  else: 

                      #print "nomatch",key  # dbg

                      pass

          def __repr__(self):

              return "<Strdispatch %s, %s>" % (self.strs, self.regexs)

          def s_matches(self, key):

              if key not in self.strs:

                   return

              for el in self.strs[key]:

                  yield el[1]

          def flat_matches(self, key):

              """ Yield all 'value' targets, without priority """

              for val in self.dispatch(key):

                  for el in val:

                      yield el[1] # only value, no priority

              return

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				"""String dispatch class to match regexps and dispatch commands.
				"""

				# Stdlib imports
				import re

				# Our own modules
				from IPython.core.hooks import CommandChainDispatcher

				# Code begins
				class StrDispatch(object):
				"""Dispatch (lookup) a set of strings / regexps for match.

				Example:

				>>> dis = StrDispatch()
				>>> dis.add_s('hei',34, priority = 4)
				>>> dis.add_s('hei',123, priority = 2)
				>>> dis.add_re('h.i', 686)
				>>> print list(dis.flat_matches('hei'))
				[123, 34, 686]
				"""

				def __init__(self):
				self.strs = {}
				self.regexs = {}

				def add_s(self, s, obj, priority= 0 ):
				""" Adds a target 'string' for dispatching """

				chain = self.strs.get(s, CommandChainDispatcher())
				chain.add(obj,priority)
				self.strs[s] = chain

				def add_re(self, regex, obj, priority= 0 ):
				""" Adds a target regexp for dispatching """

				chain = self.regexs.get(regex, CommandChainDispatcher())
				chain.add(obj,priority)
				self.regexs[regex] = chain

				def dispatch(self, key):
				""" Get a seq of Commandchain objects that match key """
				if key in self.strs:
				yield self.strs[key]

				for r, obj in self.regexs.items():
				if re.match(r, key):
				yield obj
				else:
				#print "nomatch",key # dbg
				pass

				def __repr__(self):
				return "<Strdispatch %s, %s>" % (self.strs, self.regexs)

				def s_matches(self, key):
				if key not in self.strs:
				return
				for el in self.strs[key]:
				yield el[1]

				def flat_matches(self, key):
				""" Yield all 'value' targets, without priority """
				for val in self.dispatch(key):
				for el in val:
				yield el[1] # only value, no priority
				return