Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
tree: 76b8481697
Fetching contributors…

Cannot retrieve contributors at this time

executable file 944 lines (725 sloc) 34.142 kB
# encoding: utf-8
"""
Prefiltering components.
Prefilters transform user input before it is exec'd by Python. These
transforms are used to implement additional syntax such as !ls and %magic.
Authors:
* Brian Granger
* Fernando Perez
* Dan Milstein
* Ville Vainio
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2009 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import __builtin__
import codeop
import re
from IPython.core.alias import AliasManager
from IPython.core.autocall import IPyAutocall
from IPython.config.configurable import Configurable
from IPython.core.macro import Macro
from IPython.core.splitinput import split_user_input, LineInfo
from IPython.core import page
from IPython.utils.traitlets import List, Int, Any, Unicode, CBool, Bool, Instance
from IPython.utils.text import make_quoted_expr
from IPython.utils.autoattr import auto_attr
#-----------------------------------------------------------------------------
# Global utilities, errors and constants
#-----------------------------------------------------------------------------
# Warning, these cannot be changed unless various regular expressions
# are updated in a number of places. Not great, but at least we told you.
ESC_SHELL = '!'
ESC_SH_CAP = '!!'
ESC_HELP = '?'
ESC_MAGIC = '%'
ESC_QUOTE = ','
ESC_QUOTE2 = ';'
ESC_PAREN = '/'
class PrefilterError(Exception):
pass
# RegExp to identify potential function names
re_fun_name = re.compile(r'[a-zA-Z_]([a-zA-Z0-9_.]*) *$')
# RegExp to exclude strings with this start from autocalling. In
# particular, all binary operators should be excluded, so that if foo is
# callable, foo OP bar doesn't become foo(OP bar), which is invalid. The
# characters '!=()' don't need to be checked for, as the checkPythonChars
# routine explicitely does so, to catch direct calls and rebindings of
# existing names.
# Warning: the '-' HAS TO BE AT THE END of the first group, otherwise
# it affects the rest of the group in square brackets.
re_exclude_auto = re.compile(r'^[,&^\|\*/\+-]'
r'|^is |^not |^in |^and |^or ')
# try to catch also methods for stuff in lists/tuples/dicts: off
# (experimental). For this to work, the line_split regexp would need
# to be modified so it wouldn't break things at '['. That line is
# nasty enough that I shouldn't change it until I can test it _well_.
#self.re_fun_name = re.compile (r'[a-zA-Z_]([a-zA-Z0-9_.\[\]]*) ?$')
# Handler Check Utilities
def is_shadowed(identifier, ip):
"""Is the given identifier defined in one of the namespaces which shadow
the alias and magic namespaces? Note that an identifier is different
than ifun, because it can not contain a '.' character."""
# This is much safer than calling ofind, which can change state
return (identifier in ip.user_ns \
or identifier in ip.internal_ns \
or identifier in ip.ns_table['builtin'])
#-----------------------------------------------------------------------------
# Main Prefilter manager
#-----------------------------------------------------------------------------
class PrefilterManager(Configurable):
"""Main prefilter component.
The IPython prefilter is run on all user input before it is run. The
prefilter consumes lines of input and produces transformed lines of
input.
The iplementation consists of two phases:
1. Transformers
2. Checkers and handlers
Over time, we plan on deprecating the checkers and handlers and doing
everything in the transformers.
The transformers are instances of :class:`PrefilterTransformer` and have
a single method :meth:`transform` that takes a line and returns a
transformed line. The transformation can be accomplished using any
tool, but our current ones use regular expressions for speed. We also
ship :mod:`pyparsing` in :mod:`IPython.external` for use in transformers.
After all the transformers have been run, the line is fed to the checkers,
which are instances of :class:`PrefilterChecker`. The line is passed to
the :meth:`check` method, which either returns `None` or a
:class:`PrefilterHandler` instance. If `None` is returned, the other
checkers are tried. If an :class:`PrefilterHandler` instance is returned,
the line is passed to the :meth:`handle` method of the returned
handler and no further checkers are tried.
Both transformers and checkers have a `priority` attribute, that determines
the order in which they are called. Smaller priorities are tried first.
Both transformers and checkers also have `enabled` attribute, which is
a boolean that determines if the instance is used.
Users or developers can change the priority or enabled attribute of
transformers or checkers, but they must call the :meth:`sort_checkers`
or :meth:`sort_transformers` method after changing the priority.
"""
multi_line_specials = CBool(True, config=True)
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
def __init__(self, shell=None, config=None):
super(PrefilterManager, self).__init__(shell=shell, config=config)
self.shell = shell
self.init_transformers()
self.init_handlers()
self.init_checkers()
#-------------------------------------------------------------------------
# API for managing transformers
#-------------------------------------------------------------------------
def init_transformers(self):
"""Create the default transformers."""
self._transformers = []
for transformer_cls in _default_transformers:
transformer_cls(
shell=self.shell, prefilter_manager=self, config=self.config
)
def sort_transformers(self):
"""Sort the transformers by priority.
This must be called after the priority of a transformer is changed.
The :meth:`register_transformer` method calls this automatically.
"""
self._transformers.sort(key=lambda x: x.priority)
@property
def transformers(self):
"""Return a list of checkers, sorted by priority."""
return self._transformers
def register_transformer(self, transformer):
"""Register a transformer instance."""
if transformer not in self._transformers:
self._transformers.append(transformer)
self.sort_transformers()
def unregister_transformer(self, transformer):
"""Unregister a transformer instance."""
if transformer in self._transformers:
self._transformers.remove(transformer)
#-------------------------------------------------------------------------
# API for managing checkers
#-------------------------------------------------------------------------
def init_checkers(self):
"""Create the default checkers."""
self._checkers = []
for checker in _default_checkers:
checker(
shell=self.shell, prefilter_manager=self, config=self.config
)
def sort_checkers(self):
"""Sort the checkers by priority.
This must be called after the priority of a checker is changed.
The :meth:`register_checker` method calls this automatically.
"""
self._checkers.sort(key=lambda x: x.priority)
@property
def checkers(self):
"""Return a list of checkers, sorted by priority."""
return self._checkers
def register_checker(self, checker):
"""Register a checker instance."""
if checker not in self._checkers:
self._checkers.append(checker)
self.sort_checkers()
def unregister_checker(self, checker):
"""Unregister a checker instance."""
if checker in self._checkers:
self._checkers.remove(checker)
#-------------------------------------------------------------------------
# API for managing checkers
#-------------------------------------------------------------------------
def init_handlers(self):
"""Create the default handlers."""
self._handlers = {}
self._esc_handlers = {}
for handler in _default_handlers:
handler(
shell=self.shell, prefilter_manager=self, config=self.config
)
@property
def handlers(self):
"""Return a dict of all the handlers."""
return self._handlers
def register_handler(self, name, handler, esc_strings):
"""Register a handler instance by name with esc_strings."""
self._handlers[name] = handler
for esc_str in esc_strings:
self._esc_handlers[esc_str] = handler
def unregister_handler(self, name, handler, esc_strings):
"""Unregister a handler instance by name with esc_strings."""
try:
del self._handlers[name]
except KeyError:
pass
for esc_str in esc_strings:
h = self._esc_handlers.get(esc_str)
if h is handler:
del self._esc_handlers[esc_str]
def get_handler_by_name(self, name):
"""Get a handler by its name."""
return self._handlers.get(name)
def get_handler_by_esc(self, esc_str):
"""Get a handler by its escape string."""
return self._esc_handlers.get(esc_str)
#-------------------------------------------------------------------------
# Main prefiltering API
#-------------------------------------------------------------------------
def prefilter_line_info(self, line_info):
"""Prefilter a line that has been converted to a LineInfo object.
This implements the checker/handler part of the prefilter pipe.
"""
# print "prefilter_line_info: ", line_info
handler = self.find_handler(line_info)
return handler.handle(line_info)
def find_handler(self, line_info):
"""Find a handler for the line_info by trying checkers."""
for checker in self.checkers:
if checker.enabled:
handler = checker.check(line_info)
if handler:
return handler
return self.get_handler_by_name('normal')
def transform_line(self, line, continue_prompt):
"""Calls the enabled transformers in order of increasing priority."""
for transformer in self.transformers:
if transformer.enabled:
line = transformer.transform(line, continue_prompt)
return line
def prefilter_line(self, line, continue_prompt=False):
"""Prefilter a single input line as text.
This method prefilters a single line of text by calling the
transformers and then the checkers/handlers.
"""
# print "prefilter_line: ", line, continue_prompt
# All handlers *must* return a value, even if it's blank ('').
# save the line away in case we crash, so the post-mortem handler can
# record it
self.shell._last_input_line = line
if not line:
# Return immediately on purely empty lines, so that if the user
# previously typed some whitespace that started a continuation
# prompt, he can break out of that loop with just an empty line.
# This is how the default python prompt works.
return ''
# At this point, we invoke our transformers.
if not continue_prompt or (continue_prompt and self.multi_line_specials):
line = self.transform_line(line, continue_prompt)
# Now we compute line_info for the checkers and handlers
line_info = LineInfo(line, continue_prompt)
# the input history needs to track even empty lines
stripped = line.strip()
normal_handler = self.get_handler_by_name('normal')
if not stripped:
if not continue_prompt:
self.shell.displayhook.prompt_count -= 1
return normal_handler.handle(line_info)
# special handlers are only allowed for single line statements
if continue_prompt and not self.multi_line_specials:
return normal_handler.handle(line_info)
prefiltered = self.prefilter_line_info(line_info)
# print "prefiltered line: %r" % prefiltered
return prefiltered
def prefilter_lines(self, lines, continue_prompt=False):
"""Prefilter multiple input lines of text.
This is the main entry point for prefiltering multiple lines of
input. This simply calls :meth:`prefilter_line` for each line of
input.
This covers cases where there are multiple lines in the user entry,
which is the case when the user goes back to a multiline history
entry and presses enter.
"""
llines = lines.rstrip('\n').split('\n')
# We can get multiple lines in one shot, where multiline input 'blends'
# into one line, in cases like recalling from the readline history
# buffer. We need to make sure that in such cases, we correctly
# communicate downstream which line is first and which are continuation
# ones.
if len(llines) > 1:
out = '\n'.join([self.prefilter_line(line, lnum>0)
for lnum, line in enumerate(llines) ])
else:
out = self.prefilter_line(llines[0], continue_prompt)
return out
#-----------------------------------------------------------------------------
# Prefilter transformers
#-----------------------------------------------------------------------------
class PrefilterTransformer(Configurable):
"""Transform a line of user input."""
priority = Int(100, config=True)
# Transformers don't currently use shell or prefilter_manager, but as we
# move away from checkers and handlers, they will need them.
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
prefilter_manager = Instance('IPython.core.prefilter.PrefilterManager')
enabled = Bool(True, config=True)
def __init__(self, shell=None, prefilter_manager=None, config=None):
super(PrefilterTransformer, self).__init__(
shell=shell, prefilter_manager=prefilter_manager, config=config
)
self.prefilter_manager.register_transformer(self)
def transform(self, line, continue_prompt):
"""Transform a line, returning the new one."""
return None
def __repr__(self):
return "<%s(priority=%r, enabled=%r)>" % (
self.__class__.__name__, self.priority, self.enabled)
_assign_system_re = re.compile(r'(?P<lhs>(\s*)([\w\.]+)((\s*,\s*[\w\.]+)*))'
r'\s*=\s*!(?P<cmd>.*)')
class AssignSystemTransformer(PrefilterTransformer):
"""Handle the `files = !ls` syntax."""
priority = Int(100, config=True)
def transform(self, line, continue_prompt):
m = _assign_system_re.match(line)
if m is not None:
cmd = m.group('cmd')
lhs = m.group('lhs')
expr = make_quoted_expr("sc =%s" % cmd)
new_line = '%s = get_ipython().magic(%s)' % (lhs, expr)
return new_line
return line
_assign_magic_re = re.compile(r'(?P<lhs>(\s*)([\w\.]+)((\s*,\s*[\w\.]+)*))'
r'\s*=\s*%(?P<cmd>.*)')
class AssignMagicTransformer(PrefilterTransformer):
"""Handle the `a = %who` syntax."""
priority = Int(200, config=True)
def transform(self, line, continue_prompt):
m = _assign_magic_re.match(line)
if m is not None:
cmd = m.group('cmd')
lhs = m.group('lhs')
expr = make_quoted_expr(cmd)
new_line = '%s = get_ipython().magic(%s)' % (lhs, expr)
return new_line
return line
_classic_prompt_re = re.compile(r'(^[ \t]*>>> |^[ \t]*\.\.\. )')
class PyPromptTransformer(PrefilterTransformer):
"""Handle inputs that start with '>>> ' syntax."""
priority = Int(50, config=True)
def transform(self, line, continue_prompt):
if not line or line.isspace() or line.strip() == '...':
# This allows us to recognize multiple input prompts separated by
# blank lines and pasted in a single chunk, very common when
# pasting doctests or long tutorial passages.
return ''
m = _classic_prompt_re.match(line)
if m:
return line[len(m.group(0)):]
else:
return line
_ipy_prompt_re = re.compile(r'(^[ \t]*In \[\d+\]: |^[ \t]*\ \ \ \.\.\.+: )')
class IPyPromptTransformer(PrefilterTransformer):
"""Handle inputs that start classic IPython prompt syntax."""
priority = Int(50, config=True)
def transform(self, line, continue_prompt):
if not line or line.isspace() or line.strip() == '...':
# This allows us to recognize multiple input prompts separated by
# blank lines and pasted in a single chunk, very common when
# pasting doctests or long tutorial passages.
return ''
m = _ipy_prompt_re.match(line)
if m:
return line[len(m.group(0)):]
else:
return line
#-----------------------------------------------------------------------------
# Prefilter checkers
#-----------------------------------------------------------------------------
class PrefilterChecker(Configurable):
"""Inspect an input line and return a handler for that line."""
priority = Int(100, config=True)
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
prefilter_manager = Instance('IPython.core.prefilter.PrefilterManager')
enabled = Bool(True, config=True)
def __init__(self, shell=None, prefilter_manager=None, config=None):
super(PrefilterChecker, self).__init__(
shell=shell, prefilter_manager=prefilter_manager, config=config
)
self.prefilter_manager.register_checker(self)
def check(self, line_info):
"""Inspect line_info and return a handler instance or None."""
return None
def __repr__(self):
return "<%s(priority=%r, enabled=%r)>" % (
self.__class__.__name__, self.priority, self.enabled)
class EmacsChecker(PrefilterChecker):
priority = Int(100, config=True)
enabled = Bool(False, config=True)
def check(self, line_info):
"Emacs ipython-mode tags certain input lines."
if line_info.line.endswith('# PYTHON-MODE'):
return self.prefilter_manager.get_handler_by_name('emacs')
else:
return None
class ShellEscapeChecker(PrefilterChecker):
priority = Int(200, config=True)
def check(self, line_info):
if line_info.line.lstrip().startswith(ESC_SHELL):
return self.prefilter_manager.get_handler_by_name('shell')
class MacroChecker(PrefilterChecker):
priority = Int(250, config=True)
def check(self, line_info):
obj = self.shell.user_ns.get(line_info.ifun)
if isinstance(obj, Macro):
return self.prefilter_manager.get_handler_by_name('macro')
else:
return None
class IPyAutocallChecker(PrefilterChecker):
priority = Int(300, config=True)
def check(self, line_info):
"Instances of IPyAutocall in user_ns get autocalled immediately"
obj = self.shell.user_ns.get(line_info.ifun, None)
if isinstance(obj, IPyAutocall):
obj.set_ip(self.shell)
return self.prefilter_manager.get_handler_by_name('auto')
else:
return None
class MultiLineMagicChecker(PrefilterChecker):
priority = Int(400, config=True)
def check(self, line_info):
"Allow ! and !! in multi-line statements if multi_line_specials is on"
# Note that this one of the only places we check the first character of
# ifun and *not* the pre_char. Also note that the below test matches
# both ! and !!.
if line_info.continue_prompt \
and self.prefilter_manager.multi_line_specials:
if line_info.esc == ESC_MAGIC:
return self.prefilter_manager.get_handler_by_name('magic')
else:
return None
class EscCharsChecker(PrefilterChecker):
priority = Int(500, config=True)
def check(self, line_info):
"""Check for escape character and return either a handler to handle it,
or None if there is no escape char."""
if line_info.line[-1] == ESC_HELP \
and line_info.esc != ESC_SHELL \
and line_info.esc != ESC_SH_CAP:
# the ? can be at the end, but *not* for either kind of shell escape,
# because a ? can be a vaild final char in a shell cmd
return self.prefilter_manager.get_handler_by_name('help')
else:
if line_info.pre:
return None
# This returns None like it should if no handler exists
return self.prefilter_manager.get_handler_by_esc(line_info.esc)
class AssignmentChecker(PrefilterChecker):
priority = Int(600, config=True)
def check(self, line_info):
"""Check to see if user is assigning to a var for the first time, in
which case we want to avoid any sort of automagic / autocall games.
This allows users to assign to either alias or magic names true python
variables (the magic/alias systems always take second seat to true
python code). E.g. ls='hi', or ls,that=1,2"""
if line_info.the_rest:
if line_info.the_rest[0] in '=,':
return self.prefilter_manager.get_handler_by_name('normal')
else:
return None
class AutoMagicChecker(PrefilterChecker):
priority = Int(700, config=True)
def check(self, line_info):
"""If the ifun is magic, and automagic is on, run it. Note: normal,
non-auto magic would already have been triggered via '%' in
check_esc_chars. This just checks for automagic. Also, before
triggering the magic handler, make sure that there is nothing in the
user namespace which could shadow it."""
if not self.shell.automagic or not hasattr(self.shell,'magic_'+line_info.ifun):
return None
# We have a likely magic method. Make sure we should actually call it.
if line_info.continue_prompt and not self.prefilter_manager.multi_line_specials:
return None
head = line_info.ifun.split('.',1)[0]
if is_shadowed(head, self.shell):
return None
return self.prefilter_manager.get_handler_by_name('magic')
class AliasChecker(PrefilterChecker):
priority = Int(800, config=True)
def check(self, line_info):
"Check if the initital identifier on the line is an alias."
# Note: aliases can not contain '.'
head = line_info.ifun.split('.',1)[0]
if line_info.ifun not in self.shell.alias_manager \
or head not in self.shell.alias_manager \
or is_shadowed(head, self.shell):
return None
return self.prefilter_manager.get_handler_by_name('alias')
class PythonOpsChecker(PrefilterChecker):
priority = Int(900, config=True)
def check(self, line_info):
"""If the 'rest' of the line begins with a function call or pretty much
any python operator, we should simply execute the line (regardless of
whether or not there's a possible autocall expansion). This avoids
spurious (and very confusing) geattr() accesses."""
if line_info.the_rest and line_info.the_rest[0] in '!=()<>,+*/%^&|':
return self.prefilter_manager.get_handler_by_name('normal')
else:
return None
class AutocallChecker(PrefilterChecker):
priority = Int(1000, config=True)
def check(self, line_info):
"Check if the initial word/function is callable and autocall is on."
if not self.shell.autocall:
return None
oinfo = line_info.ofind(self.shell) # This can mutate state via getattr
if not oinfo['found']:
return None
if callable(oinfo['obj']) \
and (not re_exclude_auto.match(line_info.the_rest)) \
and re_fun_name.match(line_info.ifun):
return self.prefilter_manager.get_handler_by_name('auto')
else:
return None
#-----------------------------------------------------------------------------
# Prefilter handlers
#-----------------------------------------------------------------------------
class PrefilterHandler(Configurable):
handler_name = Unicode('normal')
esc_strings = List([])
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
prefilter_manager = Instance('IPython.core.prefilter.PrefilterManager')
def __init__(self, shell=None, prefilter_manager=None, config=None):
super(PrefilterHandler, self).__init__(
shell=shell, prefilter_manager=prefilter_manager, config=config
)
self.prefilter_manager.register_handler(
self.handler_name,
self,
self.esc_strings
)
def handle(self, line_info):
# print "normal: ", line_info
"""Handle normal input lines. Use as a template for handlers."""
# With autoindent on, we need some way to exit the input loop, and I
# don't want to force the user to have to backspace all the way to
# clear the line. The rule will be in this case, that either two
# lines of pure whitespace in a row, or a line of pure whitespace but
# of a size different to the indent level, will exit the input loop.
line = line_info.line
continue_prompt = line_info.continue_prompt
if (continue_prompt and
self.shell.autoindent and
line.isspace() and
0 < abs(len(line) - self.shell.indent_current_nsp) <= 2):
line = ''
return line
def __str__(self):
return "<%s(name=%s)>" % (self.__class__.__name__, self.handler_name)
class AliasHandler(PrefilterHandler):
handler_name = Unicode('alias')
def handle(self, line_info):
"""Handle alias input lines. """
transformed = self.shell.alias_manager.expand_aliases(line_info.ifun,line_info.the_rest)
# pre is needed, because it carries the leading whitespace. Otherwise
# aliases won't work in indented sections.
line_out = '%sget_ipython().system(%s)' % (line_info.pre_whitespace,
make_quoted_expr(transformed))
return line_out
class ShellEscapeHandler(PrefilterHandler):
handler_name = Unicode('shell')
esc_strings = List([ESC_SHELL, ESC_SH_CAP])
def handle(self, line_info):
"""Execute the line in a shell, empty return value"""
magic_handler = self.prefilter_manager.get_handler_by_name('magic')
line = line_info.line
if line.lstrip().startswith(ESC_SH_CAP):
# rewrite LineInfo's line, ifun and the_rest to properly hold the
# call to %sx and the actual command to be executed, so
# handle_magic can work correctly. Note that this works even if
# the line is indented, so it handles multi_line_specials
# properly.
new_rest = line.lstrip()[2:]
line_info.line = '%ssx %s' % (ESC_MAGIC, new_rest)
line_info.ifun = 'sx'
line_info.the_rest = new_rest
return magic_handler.handle(line_info)
else:
cmd = line.lstrip().lstrip(ESC_SHELL)
line_out = '%sget_ipython().system(%s)' % (line_info.pre_whitespace,
make_quoted_expr(cmd))
return line_out
class MacroHandler(PrefilterHandler):
handler_name = Unicode("macro")
def handle(self, line_info):
obj = self.shell.user_ns.get(line_info.ifun)
pre_space = line_info.pre_whitespace
line_sep = "\n" + pre_space
return pre_space + line_sep.join(obj.value.splitlines())
class MagicHandler(PrefilterHandler):
handler_name = Unicode('magic')
esc_strings = List([ESC_MAGIC])
def handle(self, line_info):
"""Execute magic functions."""
ifun = line_info.ifun
the_rest = line_info.the_rest
cmd = '%sget_ipython().magic(%s)' % (line_info.pre_whitespace,
make_quoted_expr(ifun + " " + the_rest))
return cmd
class AutoHandler(PrefilterHandler):
handler_name = Unicode('auto')
esc_strings = List([ESC_PAREN, ESC_QUOTE, ESC_QUOTE2])
def handle(self, line_info):
"""Handle lines which can be auto-executed, quoting if requested."""
line = line_info.line
ifun = line_info.ifun
the_rest = line_info.the_rest
pre = line_info.pre
esc = line_info.esc
continue_prompt = line_info.continue_prompt
obj = line_info.ofind(self)['obj']
#print 'pre <%s> ifun <%s> rest <%s>' % (pre,ifun,the_rest) # dbg
# This should only be active for single-line input!
if continue_prompt:
return line
force_auto = isinstance(obj, IPyAutocall)
auto_rewrite = getattr(obj, 'rewrite', True)
if esc == ESC_QUOTE:
# Auto-quote splitting on whitespace
newcmd = '%s("%s")' % (ifun,'", "'.join(the_rest.split()) )
elif esc == ESC_QUOTE2:
# Auto-quote whole string
newcmd = '%s("%s")' % (ifun,the_rest)
elif esc == ESC_PAREN:
newcmd = '%s(%s)' % (ifun,",".join(the_rest.split()))
else:
# Auto-paren.
# We only apply it to argument-less calls if the autocall
# parameter is set to 2. We only need to check that autocall is <
# 2, since this function isn't called unless it's at least 1.
if not the_rest and (self.shell.autocall < 2) and not force_auto:
newcmd = '%s %s' % (ifun,the_rest)
auto_rewrite = False
else:
if not force_auto and the_rest.startswith('['):
if hasattr(obj,'__getitem__'):
# Don't autocall in this case: item access for an object
# which is BOTH callable and implements __getitem__.
newcmd = '%s %s' % (ifun,the_rest)
auto_rewrite = False
else:
# if the object doesn't support [] access, go ahead and
# autocall
newcmd = '%s(%s)' % (ifun.rstrip(),the_rest)
elif the_rest.endswith(';'):
newcmd = '%s(%s);' % (ifun.rstrip(),the_rest[:-1])
else:
newcmd = '%s(%s)' % (ifun.rstrip(), the_rest)
if auto_rewrite:
self.shell.auto_rewrite_input(newcmd)
return newcmd
class HelpHandler(PrefilterHandler):
handler_name = Unicode('help')
esc_strings = List([ESC_HELP])
def handle(self, line_info):
"""Try to get some help for the object.
obj? or ?obj -> basic information.
obj?? or ??obj -> more details.
"""
normal_handler = self.prefilter_manager.get_handler_by_name('normal')
line = line_info.line
# We need to make sure that we don't process lines which would be
# otherwise valid python, such as "x=1 # what?"
try:
codeop.compile_command(line)
except SyntaxError:
# We should only handle as help stuff which is NOT valid syntax
if line[0]==ESC_HELP:
line = line[1:]
elif line[-1]==ESC_HELP:
line = line[:-1]
if line:
#print 'line:<%r>' % line # dbg
self.shell.magic_pinfo(line_info.ifun)
else:
self.shell.show_usage()
return '' # Empty string is needed here!
except:
raise
# Pass any other exceptions through to the normal handler
return normal_handler.handle(line_info)
else:
# If the code compiles ok, we should handle it normally
return normal_handler.handle(line_info)
class EmacsHandler(PrefilterHandler):
handler_name = Unicode('emacs')
esc_strings = List([])
def handle(self, line_info):
"""Handle input lines marked by python-mode."""
# Currently, nothing is done. Later more functionality can be added
# here if needed.
# The input cache shouldn't be updated
return line_info.line
#-----------------------------------------------------------------------------
# Defaults
#-----------------------------------------------------------------------------
_default_transformers = [
AssignSystemTransformer,
AssignMagicTransformer,
PyPromptTransformer,
IPyPromptTransformer,
]
_default_checkers = [
EmacsChecker,
ShellEscapeChecker,
MacroChecker,
IPyAutocallChecker,
MultiLineMagicChecker,
EscCharsChecker,
AssignmentChecker,
AutoMagicChecker,
AliasChecker,
PythonOpsChecker,
AutocallChecker
]
_default_handlers = [
PrefilterHandler,
AliasHandler,
ShellEscapeHandler,
MacroHandler,
MagicHandler,
AutoHandler,
HelpHandler,
EmacsHandler
]
Jump to Line
Something went wrong with that request. Please try again.