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# encoding: utf-8
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"""Central interpreter object for an IPython engine.
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The interpreter is the object whose job is to process lines of user input and
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actually execute them in the user's namespace.
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"""
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__docformat__ = "restructuredtext en"
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#-------------------------------------------------------------------------------
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# Copyright (C) 2008 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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# Standard library imports.
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from compiler.ast import Discard
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from types import FunctionType
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import __builtin__
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import codeop
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import compiler
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import pprint
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import sys
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import traceback
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# Local imports.
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from IPython.kernel.core import ultraTB
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from IPython.kernel.core.display_trap import DisplayTrap
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from IPython.kernel.core.macro import Macro
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from IPython.kernel.core.prompts import CachedOutput
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from IPython.kernel.core.traceback_trap import TracebackTrap
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from IPython.kernel.core.util import Bunch, system_shell
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from IPython.external.Itpl import ItplNS
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# Global constants
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COMPILER_ERROR = 'error'
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INCOMPLETE_INPUT = 'incomplete'
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COMPLETE_INPUT = 'complete'
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##############################################################################
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# TEMPORARY!!! fake configuration, while we decide whether to use tconfig or
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# not
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rc = Bunch()
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rc.cache_size = 100
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rc.pprint = True
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rc.separate_in = '\n'
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rc.separate_out = '\n'
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rc.separate_out2 = ''
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rc.prompt_in1 = r'In [\#]: '
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rc.prompt_in2 = r' .\\D.: '
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rc.prompt_out = ''
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rc.prompts_pad_left = False
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##############################################################################
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# Top-level utilities
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def default_display_formatters():
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""" Return a list of default display formatters.
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"""
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from display_formatter import PPrintDisplayFormatter, ReprDisplayFormatter
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return [PPrintDisplayFormatter(), ReprDisplayFormatter()]
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def default_traceback_formatters():
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""" Return a list of default traceback formatters.
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"""
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from traceback_formatter import PlainTracebackFormatter
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return [PlainTracebackFormatter()]
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# Top-level classes
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class NotDefined(object): pass
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class Interpreter(object):
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""" An interpreter object.
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fixme: needs to negotiate available formatters with frontends.
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Important: the interpeter should be built so that it exposes a method
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for each attribute/method of its sub-object. This way it can be
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replaced by a network adapter.
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"""
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def __init__(self, user_ns=None, global_ns=None,translator=None,
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magic=None, display_formatters=None,
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traceback_formatters=None, output_trap=None, history=None,
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message_cache=None, filename='<string>', config=None):
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# The local/global namespaces for code execution
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local_ns = user_ns # compatibility name
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if local_ns is None:
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local_ns = {}
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self.user_ns = local_ns
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# The local namespace
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if global_ns is None:
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global_ns = {}
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self.user_global_ns = global_ns
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# An object that will translate commands into executable Python.
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# The current translator does not work properly so for now we are going
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# without!
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# if translator is None:
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# from IPython.kernel.core.translator import IPythonTranslator
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# translator = IPythonTranslator()
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self.translator = translator
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# An object that maintains magic commands.
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if magic is None:
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from IPython.kernel.core.magic import Magic
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magic = Magic(self)
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self.magic = magic
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# A list of formatters for the displayhook.
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if display_formatters is None:
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display_formatters = default_display_formatters()
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self.display_formatters = display_formatters
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# A list of formatters for tracebacks.
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if traceback_formatters is None:
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traceback_formatters = default_traceback_formatters()
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self.traceback_formatters = traceback_formatters
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# The object trapping stdout/stderr.
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if output_trap is None:
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from IPython.kernel.core.output_trap import OutputTrap
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output_trap = OutputTrap()
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self.output_trap = output_trap
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# An object that manages the history.
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if history is None:
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from IPython.kernel.core.history import InterpreterHistory
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history = InterpreterHistory()
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self.history = history
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self.get_history_item = history.get_history_item
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self.get_history_input_cache = history.get_input_cache
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self.get_history_input_after = history.get_input_after
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# An object that caches all of the return messages.
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if message_cache is None:
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from IPython.kernel.core.message_cache import SimpleMessageCache
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message_cache = SimpleMessageCache()
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self.message_cache = message_cache
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# The "filename" of the code that is executed in this interpreter.
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self.filename = filename
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# An object that contains much configuration information.
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if config is None:
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# fixme: Move this constant elsewhere!
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config = Bunch(ESC_MAGIC='%')
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self.config = config
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# Hook managers.
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# fixme: make the display callbacks configurable. In the meantime,
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# enable macros.
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self.display_trap = DisplayTrap(
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formatters=self.display_formatters,
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callbacks=[self._possible_macro],
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)
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self.traceback_trap = TracebackTrap(
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formatters=self.traceback_formatters)
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# This is used temporarily for reformating exceptions in certain
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# cases. It will go away once the ultraTB stuff is ported
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# to ipython1
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self.tbHandler = ultraTB.FormattedTB(color_scheme='NoColor',
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mode='Context',
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tb_offset=2)
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# An object that can compile commands and remember __future__
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# statements.
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self.command_compiler = codeop.CommandCompiler()
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# A replacement for the raw_input() and input() builtins. Change these
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# attributes later to configure them.
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self.raw_input_builtin = raw_input
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self.input_builtin = input
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# The number of the current cell.
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self.current_cell_number = 1
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# Initialize cache, set in/out prompts and printing system
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self.outputcache = CachedOutput(self,
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rc.cache_size,
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rc.pprint,
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input_sep = rc.separate_in,
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output_sep = rc.separate_out,
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output_sep2 = rc.separate_out2,
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ps1 = rc.prompt_in1,
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ps2 = rc.prompt_in2,
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ps_out = rc.prompt_out,
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pad_left = rc.prompts_pad_left)
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# Need to decide later if this is the right approach, but clients
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# commonly use sys.ps1/2, so it may be best to just set them here
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sys.ps1 = self.outputcache.prompt1.p_str
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sys.ps2 = self.outputcache.prompt2.p_str
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# This is the message dictionary assigned temporarily when running the
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# code.
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self.message = None
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self.setup_namespace()
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#### Public 'Interpreter' interface ########################################
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def formatTraceback(self, et, ev, tb, message=''):
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"""Put a formatted version of the traceback into value and reraise.
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When exceptions have to be sent over the network, the traceback
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needs to be put into the value of the exception in a nicely
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formatted way. The method takes the type, value and tb of an
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exception and puts a string representation of the tb into the
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value of the exception and reraises it.
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Currently this method uses the ultraTb formatter from IPython trunk.
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Eventually it should simply use the traceback formatters in core
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that are loaded into self.tracback_trap.formatters.
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"""
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tbinfo = self.tbHandler.text(et,ev,tb)
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ev._ipython_traceback_text = tbinfo
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return et, ev, tb
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def execute(self, commands, raiseException=True):
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""" Execute some IPython commands.
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1. Translate them into Python.
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2. Run them.
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3. Trap stdout/stderr.
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4. Trap sys.displayhook().
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5. Trap exceptions.
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6. Return a message object.
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Parameters
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----------
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commands : str
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The raw commands that the user typed into the prompt.
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Returns
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-------
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message : dict
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The dictionary of responses. See the README.txt in this directory
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for an explanation of the format.
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"""
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# Create a message dictionary with all of the information we will be
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# returning to the frontend and other listeners.
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message = self.setup_message()
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# Massage the input and store the raw and translated commands into
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# a dict.
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user_input = dict(raw=commands)
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if self.translator is not None:
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python = self.translator(commands, message)
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if python is None:
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# Something went wrong with the translation. The translator
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# should have added an appropriate entry to the message object.
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return message
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else:
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python = commands
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user_input['translated'] = python
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message['input'] = user_input
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# Set the message object so that any magics executed in the code have
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# access.
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self.message = message
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# Set all of the output/exception traps.
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self.set_traps()
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# Actually execute the Python code.
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status = self.execute_python(python)
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# Unset all of the traps.
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self.unset_traps()
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# Unset the message object.
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self.message = None
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# Update the history variables in the namespace.
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# E.g. In, Out, _, __, ___
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if self.history is not None:
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self.history.update_history(self, python)
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# Let all of the traps contribute to the message and then clear their
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# stored information.
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self.output_trap.add_to_message(message)
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self.output_trap.clear()
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self.display_trap.add_to_message(message)
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self.display_trap.clear()
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self.traceback_trap.add_to_message(message)
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# Pull out the type, value and tb of the current exception
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# before clearing it.
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einfo = self.traceback_trap.args
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self.traceback_trap.clear()
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# Cache the message.
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self.message_cache.add_message(self.current_cell_number, message)
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# Bump the number.
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self.current_cell_number += 1
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# This conditional lets the execute method either raise any
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# exception that has occured in user code OR return the message
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# dict containing the traceback and other useful info.
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if raiseException and einfo:
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raise einfo[0],einfo[1],einfo[2]
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else:
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return message
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def generate_prompt(self, is_continuation):
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"""Calculate and return a string with the prompt to display.
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:Parameters:
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is_continuation : bool
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Whether the input line is continuing multiline input or not, so
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that a proper continuation prompt can be computed."""
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if is_continuation:
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return str(self.outputcache.prompt2)
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else:
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return str(self.outputcache.prompt1)
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def execute_python(self, python):
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""" Actually run the Python code in the namespace.
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:Parameters:
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python : str
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Pure, exec'able Python code. Special IPython commands should have
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already been translated into pure Python.
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"""
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# We use a CommandCompiler instance to compile the code so as to keep
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# track of __future__ imports.
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try:
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commands = self.split_commands(python)
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except (SyntaxError, IndentationError), e:
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# Save the exc_info so compilation related exceptions can be
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# reraised
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self.traceback_trap.args = sys.exc_info()
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self.pack_exception(self.message,e)
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return None
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for cmd in commands:
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try:
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code = self.command_compiler(cmd, self.filename, 'single')
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except (SyntaxError, OverflowError, ValueError), e:
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self.traceback_trap.args = sys.exc_info()
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self.pack_exception(self.message,e)
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# No point in continuing if one block raised
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return None
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else:
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self.execute_block(code)
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def execute_block(self,code):
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"""Execute a single block of code in the user namespace.
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Return value: a flag indicating whether the code to be run completed
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successfully:
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- 0: successful execution.
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- 1: an error occurred.
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"""
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outflag = 1 # start by assuming error, success will reset it
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try:
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exec code in self.user_ns
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outflag = 0
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except SystemExit:
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self.resetbuffer()
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self.traceback_trap.args = sys.exc_info()
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except:
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self.traceback_trap.args = sys.exc_info()
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return outflag
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def execute_macro(self, macro):
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""" Execute the value of a macro.
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Parameters
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----------
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macro : Macro
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"""
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python = macro.value
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if self.translator is not None:
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python = self.translator(python)
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self.execute_python(python)
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def getCommand(self, i=None):
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"""Gets the ith message in the message_cache.
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This is implemented here for compatibility with the old ipython1 shell
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I am not sure we need this though. I even seem to remember that we
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were going to get rid of it.
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"""
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return self.message_cache.get_message(i)
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def reset(self):
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"""Reset the interpreter.
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Currently this only resets the users variables in the namespace.
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In the future we might want to also reset the other stateful
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things like that the Interpreter has, like In, Out, etc.
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"""
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self.user_ns.clear()
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self.setup_namespace()
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def complete(self,line,text=None, pos=None):
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"""Complete the given text.
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:Parameters:
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text : str
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Text fragment to be completed on. Typically this is
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"""
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# fixme: implement
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raise NotImplementedError
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def push(self, ns):
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""" Put value into the namespace with name key.
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Parameters
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----------
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**kwds
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"""
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self.user_ns.update(ns)
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def push_function(self, ns):
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# First set the func_globals for all functions to self.user_ns
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new_kwds = {}
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for k, v in ns.iteritems():
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if not isinstance(v, FunctionType):
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raise TypeError("function object expected")
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new_kwds[k] = FunctionType(v.func_code, self.user_ns)
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self.user_ns.update(new_kwds)
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def pack_exception(self,message,exc):
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message['exception'] = exc.__class__
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message['exception_value'] = \
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traceback.format_exception_only(exc.__class__, exc)
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def feed_block(self, source, filename='<input>', symbol='single'):
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"""Compile some source in the interpreter.
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One several things can happen:
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1) The input is incorrect; compile_command() raised an
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exception (SyntaxError or OverflowError).
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2) The input is incomplete, and more input is required;
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compile_command() returned None. Nothing happens.
|
|
|
|
|
|
3) The input is complete; compile_command() returned a code
|
|
|
object. The code is executed by calling self.runcode() (which
|
|
|
also handles run-time exceptions, except for SystemExit).
|
|
|
|
|
|
The return value is:
|
|
|
|
|
|
- True in case 2
|
|
|
|
|
|
- False in the other cases, unless an exception is raised, where
|
|
|
None is returned instead. This can be used by external callers to
|
|
|
know whether to continue feeding input or not.
|
|
|
|
|
|
The return value can be used to decide whether to use sys.ps1 or
|
|
|
sys.ps2 to prompt the next line."""
|
|
|
|
|
|
self.message = self.setup_message()
|
|
|
|
|
|
try:
|
|
|
code = self.command_compiler(source,filename,symbol)
|
|
|
except (OverflowError, SyntaxError, IndentationError, ValueError ), e:
|
|
|
# Case 1
|
|
|
self.traceback_trap.args = sys.exc_info()
|
|
|
self.pack_exception(self.message,e)
|
|
|
return COMPILER_ERROR,False
|
|
|
|
|
|
if code is None:
|
|
|
# Case 2: incomplete input. This means that the input can span
|
|
|
# multiple lines. But we still need to decide when to actually
|
|
|
# stop taking user input. Later we'll add auto-indentation support
|
|
|
# somehow. In the meantime, we'll just stop if there are two lines
|
|
|
# of pure whitespace at the end.
|
|
|
last_two = source.rsplit('\n',2)[-2:]
|
|
|
print 'last two:',last_two # dbg
|
|
|
if len(last_two)==2 and all(s.isspace() for s in last_two):
|
|
|
return COMPLETE_INPUT,False
|
|
|
else:
|
|
|
return INCOMPLETE_INPUT, True
|
|
|
else:
|
|
|
# Case 3
|
|
|
return COMPLETE_INPUT, False
|
|
|
|
|
|
def pull(self, keys):
|
|
|
""" Get an item out of the namespace by key.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
key : str
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
value : object
|
|
|
|
|
|
Raises
|
|
|
------
|
|
|
TypeError if the key is not a string.
|
|
|
NameError if the object doesn't exist.
|
|
|
"""
|
|
|
|
|
|
if isinstance(keys, str):
|
|
|
result = self.user_ns.get(keys, NotDefined())
|
|
|
if isinstance(result, NotDefined):
|
|
|
raise NameError('name %s is not defined' % keys)
|
|
|
elif isinstance(keys, (list, tuple)):
|
|
|
result = []
|
|
|
for key in keys:
|
|
|
if not isinstance(key, str):
|
|
|
raise TypeError("objects must be keyed by strings.")
|
|
|
else:
|
|
|
r = self.user_ns.get(key, NotDefined())
|
|
|
if isinstance(r, NotDefined):
|
|
|
raise NameError('name %s is not defined' % key)
|
|
|
else:
|
|
|
result.append(r)
|
|
|
if len(keys)==1:
|
|
|
result = result[0]
|
|
|
else:
|
|
|
raise TypeError("keys must be a strong or a list/tuple of strings")
|
|
|
return result
|
|
|
|
|
|
def pull_function(self, keys):
|
|
|
return self.pull(keys)
|
|
|
|
|
|
#### Interactive user API ##################################################
|
|
|
|
|
|
def ipsystem(self, command):
|
|
|
""" Execute a command in a system shell while expanding variables in the
|
|
|
current namespace.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
command : str
|
|
|
"""
|
|
|
|
|
|
# Expand $variables.
|
|
|
command = self.var_expand(command)
|
|
|
|
|
|
system_shell(command,
|
|
|
header='IPython system call: ',
|
|
|
verbose=self.rc.system_verbose,
|
|
|
)
|
|
|
|
|
|
def ipmagic(self, arg_string):
|
|
|
""" Call a magic function by name.
|
|
|
|
|
|
ipmagic('name -opt foo bar') is equivalent to typing at the ipython
|
|
|
prompt:
|
|
|
|
|
|
In[1]: %name -opt foo bar
|
|
|
|
|
|
To call a magic without arguments, simply use ipmagic('name').
|
|
|
|
|
|
This provides a proper Python function to call IPython's magics in any
|
|
|
valid Python code you can type at the interpreter, including loops and
|
|
|
compound statements. It is added by IPython to the Python builtin
|
|
|
namespace upon initialization.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
arg_string : str
|
|
|
A string containing the name of the magic function to call and any
|
|
|
additional arguments to be passed to the magic.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
something : object
|
|
|
The return value of the actual object.
|
|
|
"""
|
|
|
|
|
|
# Taken from IPython.
|
|
|
raise NotImplementedError('Not ported yet')
|
|
|
|
|
|
args = arg_string.split(' ', 1)
|
|
|
magic_name = args[0]
|
|
|
magic_name = magic_name.lstrip(self.config.ESC_MAGIC)
|
|
|
|
|
|
try:
|
|
|
magic_args = args[1]
|
|
|
except IndexError:
|
|
|
magic_args = ''
|
|
|
fn = getattr(self.magic, 'magic_'+magic_name, None)
|
|
|
if fn is None:
|
|
|
self.error("Magic function `%s` not found." % magic_name)
|
|
|
else:
|
|
|
magic_args = self.var_expand(magic_args)
|
|
|
return fn(magic_args)
|
|
|
|
|
|
|
|
|
#### Private 'Interpreter' interface #######################################
|
|
|
|
|
|
def setup_message(self):
|
|
|
"""Return a message object.
|
|
|
|
|
|
This method prepares and returns a message dictionary. This dict
|
|
|
contains the various fields that are used to transfer information about
|
|
|
execution, results, tracebacks, etc, to clients (either in or out of
|
|
|
process ones). Because of the need to work with possibly out of
|
|
|
process clients, this dict MUST contain strictly pickle-safe values.
|
|
|
"""
|
|
|
|
|
|
return dict(number=self.current_cell_number)
|
|
|
|
|
|
def setup_namespace(self):
|
|
|
""" Add things to the namespace.
|
|
|
"""
|
|
|
|
|
|
self.user_ns.setdefault('__name__', '__main__')
|
|
|
self.user_ns.setdefault('__builtins__', __builtin__)
|
|
|
self.user_ns['__IP'] = self
|
|
|
if self.raw_input_builtin is not None:
|
|
|
self.user_ns['raw_input'] = self.raw_input_builtin
|
|
|
if self.input_builtin is not None:
|
|
|
self.user_ns['input'] = self.input_builtin
|
|
|
|
|
|
builtin_additions = dict(
|
|
|
ipmagic=self.ipmagic,
|
|
|
)
|
|
|
__builtin__.__dict__.update(builtin_additions)
|
|
|
|
|
|
if self.history is not None:
|
|
|
self.history.setup_namespace(self.user_ns)
|
|
|
|
|
|
def set_traps(self):
|
|
|
""" Set all of the output, display, and traceback traps.
|
|
|
"""
|
|
|
|
|
|
self.output_trap.set()
|
|
|
self.display_trap.set()
|
|
|
self.traceback_trap.set()
|
|
|
|
|
|
def unset_traps(self):
|
|
|
""" Unset all of the output, display, and traceback traps.
|
|
|
"""
|
|
|
|
|
|
self.output_trap.unset()
|
|
|
self.display_trap.unset()
|
|
|
self.traceback_trap.unset()
|
|
|
|
|
|
def split_commands(self, python):
|
|
|
""" Split multiple lines of code into discrete commands that can be
|
|
|
executed singly.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
python : str
|
|
|
Pure, exec'able Python code.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
commands : list of str
|
|
|
Separate commands that can be exec'ed independently.
|
|
|
"""
|
|
|
|
|
|
# compiler.parse treats trailing spaces after a newline as a
|
|
|
# SyntaxError. This is different than codeop.CommandCompiler, which
|
|
|
# will compile the trailng spaces just fine. We simply strip any
|
|
|
# trailing whitespace off. Passing a string with trailing whitespace
|
|
|
# to exec will fail however. There seems to be some inconsistency in
|
|
|
# how trailing whitespace is handled, but this seems to work.
|
|
|
python = python.strip()
|
|
|
|
|
|
# The compiler module will parse the code into an abstract syntax tree.
|
|
|
ast = compiler.parse(python)
|
|
|
|
|
|
# Uncomment to help debug the ast tree
|
|
|
# for n in ast.node:
|
|
|
# print n.lineno,'->',n
|
|
|
|
|
|
# Each separate command is available by iterating over ast.node. The
|
|
|
# lineno attribute is the line number (1-indexed) beginning the commands
|
|
|
# suite.
|
|
|
# lines ending with ";" yield a Discard Node that doesn't have a lineno
|
|
|
# attribute. These nodes can and should be discarded. But there are
|
|
|
# other situations that cause Discard nodes that shouldn't be discarded.
|
|
|
# We might eventually discover other cases where lineno is None and have
|
|
|
# to put in a more sophisticated test.
|
|
|
linenos = [x.lineno-1 for x in ast.node if x.lineno is not None]
|
|
|
|
|
|
# When we finally get the slices, we will need to slice all the way to
|
|
|
# the end even though we don't have a line number for it. Fortunately,
|
|
|
# None does the job nicely.
|
|
|
linenos.append(None)
|
|
|
lines = python.splitlines()
|
|
|
|
|
|
# Create a list of atomic commands.
|
|
|
cmds = []
|
|
|
for i, j in zip(linenos[:-1], linenos[1:]):
|
|
|
cmd = lines[i:j]
|
|
|
if cmd:
|
|
|
cmds.append('\n'.join(cmd)+'\n')
|
|
|
|
|
|
return cmds
|
|
|
|
|
|
def error(self, text):
|
|
|
""" Pass an error message back to the shell.
|
|
|
|
|
|
Preconditions
|
|
|
-------------
|
|
|
This should only be called when self.message is set. In other words,
|
|
|
when code is being executed.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
text : str
|
|
|
"""
|
|
|
|
|
|
errors = self.message.get('IPYTHON_ERROR', [])
|
|
|
errors.append(text)
|
|
|
|
|
|
def var_expand(self, template):
|
|
|
""" Expand $variables in the current namespace using Itpl.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
template : str
|
|
|
"""
|
|
|
|
|
|
return str(ItplNS(template, self.user_ns))
|
|
|
|
|
|
def _possible_macro(self, obj):
|
|
|
""" If the object is a macro, execute it.
|
|
|
"""
|
|
|
|
|
|
if isinstance(obj, Macro):
|
|
|
self.execute_macro(obj)
|
|
|
|
|
|
|
