|
|
# 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) 2008-2011 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 re
|
|
|
|
|
|
from IPython.core.autocall import IPyAutocall
|
|
|
from IPython.config.configurable import Configurable
|
|
|
from IPython.core.inputsplitter import (
|
|
|
ESC_MAGIC,
|
|
|
ESC_QUOTE,
|
|
|
ESC_QUOTE2,
|
|
|
ESC_PAREN,
|
|
|
)
|
|
|
from IPython.core.macro import Macro
|
|
|
from IPython.core.splitinput import LineInfo
|
|
|
|
|
|
from IPython.utils.traitlets import (
|
|
|
List, Integer, Unicode, CBool, Bool, Instance, CRegExp
|
|
|
)
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Global utilities, errors and constants
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
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.user_global_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.
|
|
|
|
|
|
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, **kwargs):
|
|
|
super(PrefilterManager, self).__init__(shell=shell, **kwargs)
|
|
|
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, parent=self
|
|
|
)
|
|
|
|
|
|
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, parent=self
|
|
|
)
|
|
|
|
|
|
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, parent=self
|
|
|
)
|
|
|
|
|
|
@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:
|
|
|
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 = Integer(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, **kwargs):
|
|
|
super(PrefilterTransformer, self).__init__(
|
|
|
shell=shell, prefilter_manager=prefilter_manager, **kwargs
|
|
|
)
|
|
|
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)
|
|
|
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Prefilter checkers
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
class PrefilterChecker(Configurable):
|
|
|
"""Inspect an input line and return a handler for that line."""
|
|
|
|
|
|
priority = Integer(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, **kwargs):
|
|
|
super(PrefilterChecker, self).__init__(
|
|
|
shell=shell, prefilter_manager=prefilter_manager, **kwargs
|
|
|
)
|
|
|
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 = Integer(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 MacroChecker(PrefilterChecker):
|
|
|
|
|
|
priority = Integer(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 = Integer(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 AssignmentChecker(PrefilterChecker):
|
|
|
|
|
|
priority = Integer(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 = Integer(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 self.shell.find_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 = Integer(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 = Integer(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 = Integer(1000, config=True)
|
|
|
|
|
|
function_name_regexp = CRegExp(re_fun_name, config=True,
|
|
|
help="RegExp to identify potential function names.")
|
|
|
exclude_regexp = CRegExp(re_exclude_auto, config=True,
|
|
|
help="RegExp to exclude strings with this start from autocalling.")
|
|
|
|
|
|
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 self.exclude_regexp.match(line_info.the_rest)) \
|
|
|
and self.function_name_regexp.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, **kwargs):
|
|
|
super(PrefilterHandler, self).__init__(
|
|
|
shell=shell, prefilter_manager=prefilter_manager, **kwargs
|
|
|
)
|
|
|
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(%r)' % (line_info.pre_whitespace, transformed)
|
|
|
|
|
|
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(%r)' % (line_info.pre_whitespace,
|
|
|
(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.shell)['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)
|
|
|
|
|
|
# User objects sometimes raise exceptions on attribute access other
|
|
|
# than AttributeError (we've seen it in the past), so it's safest to be
|
|
|
# ultra-conservative here and catch all.
|
|
|
try:
|
|
|
auto_rewrite = obj.rewrite
|
|
|
except Exception:
|
|
|
auto_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.
|
|
|
if force_auto:
|
|
|
# Don't rewrite if it is already a call.
|
|
|
do_rewrite = not the_rest.startswith('(')
|
|
|
else:
|
|
|
if not the_rest:
|
|
|
# We only apply it to argument-less calls if the autocall
|
|
|
# parameter is set to 2.
|
|
|
do_rewrite = (self.shell.autocall >= 2)
|
|
|
elif the_rest.startswith('[') and hasattr(obj, '__getitem__'):
|
|
|
# Don't autocall in this case: item access for an object
|
|
|
# which is BOTH callable and implements __getitem__.
|
|
|
do_rewrite = False
|
|
|
else:
|
|
|
do_rewrite = True
|
|
|
|
|
|
# Figure out the rewritten command
|
|
|
if do_rewrite:
|
|
|
if the_rest.endswith(';'):
|
|
|
newcmd = '%s(%s);' % (ifun.rstrip(),the_rest[:-1])
|
|
|
else:
|
|
|
newcmd = '%s(%s)' % (ifun.rstrip(), the_rest)
|
|
|
else:
|
|
|
normal_handler = self.prefilter_manager.get_handler_by_name('normal')
|
|
|
return normal_handler.handle(line_info)
|
|
|
|
|
|
# Display the rewritten call
|
|
|
if auto_rewrite:
|
|
|
self.shell.auto_rewrite_input(newcmd)
|
|
|
|
|
|
return newcmd
|
|
|
|
|
|
|
|
|
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 = [
|
|
|
]
|
|
|
|
|
|
_default_checkers = [
|
|
|
EmacsChecker,
|
|
|
MacroChecker,
|
|
|
IPyAutocallChecker,
|
|
|
AssignmentChecker,
|
|
|
AutoMagicChecker,
|
|
|
AliasChecker,
|
|
|
PythonOpsChecker,
|
|
|
AutocallChecker
|
|
|
]
|
|
|
|
|
|
_default_handlers = [
|
|
|
PrefilterHandler,
|
|
|
AliasHandler,
|
|
|
MacroHandler,
|
|
|
MagicHandler,
|
|
|
AutoHandler,
|
|
|
EmacsHandler
|
|
|
]
|
|
|
|