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# -*- coding: utf-8 -*-
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"""Displayhook for IPython.
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Authors:
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* Fernando Perez
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* Brian Granger
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2010 The IPython Development Team
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# Copyright (C) 2001-2007 Fernando Perez <fperez@colorado.edu>
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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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import __builtin__
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from pprint import PrettyPrinter
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pformat = PrettyPrinter().pformat
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from IPython.config.configurable import Configurable
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from IPython.core import prompts
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import IPython.utils.generics
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import IPython.utils.io
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from IPython.utils.traitlets import Instance, Int
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from IPython.utils.warn import warn
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#-----------------------------------------------------------------------------
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# Main displayhook class
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#-----------------------------------------------------------------------------
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# TODO: The DisplayHook class should be split into two classes, one that
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# manages the prompts and their synchronization and another that just does the
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# displayhook logic and calls into the prompt manager.
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# TODO: Move the various attributes (cache_size, colors, input_sep,
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# output_sep, output_sep2, ps1, ps2, ps_out, pad_left). Some of these are also
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# attributes of InteractiveShell. They should be on ONE object only and the
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# other objects should ask that one object for their values.
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class DisplayHook(Configurable):
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"""The custom IPython displayhook to replace sys.displayhook.
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This class does many things, but the basic idea is that it is a callable
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that gets called anytime user code returns a value.
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Currently this class does more than just the displayhook logic and that
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extra logic should eventually be moved out of here.
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"""
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shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
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# Each call to the In[] prompt raises it by 1, even the first.
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#prompt_count = Int(0)
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def __init__(self, shell=None, cache_size=1000,
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colors='NoColor', input_sep='\n',
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output_sep='\n', output_sep2='',
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ps1 = None, ps2 = None, ps_out = None, pad_left=True,
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config=None):
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super(DisplayHook, self).__init__(shell=shell, config=config)
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cache_size_min = 3
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if cache_size <= 0:
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self.do_full_cache = 0
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cache_size = 0
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elif cache_size < cache_size_min:
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self.do_full_cache = 0
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cache_size = 0
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warn('caching was disabled (min value for cache size is %s).' %
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cache_size_min,level=3)
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else:
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self.do_full_cache = 1
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self.cache_size = cache_size
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self.input_sep = input_sep
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# we need a reference to the user-level namespace
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self.shell = shell
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# Set input prompt strings and colors
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if cache_size == 0:
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if ps1.find('%n') > -1 or ps1.find(r'\#') > -1 \
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or ps1.find(r'\N') > -1:
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ps1 = '>>> '
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if ps2.find('%n') > -1 or ps2.find(r'\#') > -1 \
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or ps2.find(r'\N') > -1:
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ps2 = '... '
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self.ps1_str = self._set_prompt_str(ps1,'In [\\#]: ','>>> ')
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self.ps2_str = self._set_prompt_str(ps2,' .\\D.: ','... ')
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self.ps_out_str = self._set_prompt_str(ps_out,'Out[\\#]: ','')
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self.color_table = prompts.PromptColors
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self.prompt1 = prompts.Prompt1(self,sep=input_sep,prompt=self.ps1_str,
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pad_left=pad_left)
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self.prompt2 = prompts.Prompt2(self,prompt=self.ps2_str,pad_left=pad_left)
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self.prompt_out = prompts.PromptOut(self,sep='',prompt=self.ps_out_str,
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pad_left=pad_left)
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self.set_colors(colors)
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# Store the last prompt string each time, we need it for aligning
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# continuation and auto-rewrite prompts
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self.last_prompt = ''
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self.output_sep = output_sep
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self.output_sep2 = output_sep2
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self._,self.__,self.___ = '','',''
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self.pprint_types = map(type,[(),[],{}])
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# these are deliberately global:
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to_user_ns = {'_':self._,'__':self.__,'___':self.___}
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self.shell.user_ns.update(to_user_ns)
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@property
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def prompt_count(self):
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return self.shell.execution_count
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def _set_prompt_str(self,p_str,cache_def,no_cache_def):
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if p_str is None:
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if self.do_full_cache:
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return cache_def
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else:
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return no_cache_def
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else:
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return p_str
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def set_colors(self, colors):
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"""Set the active color scheme and configure colors for the three
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prompt subsystems."""
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# FIXME: This modifying of the global prompts.prompt_specials needs
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# to be fixed. We need to refactor all of the prompts stuff to use
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# proper configuration and traits notifications.
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if colors.lower()=='nocolor':
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prompts.prompt_specials = prompts.prompt_specials_nocolor
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else:
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prompts.prompt_specials = prompts.prompt_specials_color
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self.color_table.set_active_scheme(colors)
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self.prompt1.set_colors()
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self.prompt2.set_colors()
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self.prompt_out.set_colors()
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#-------------------------------------------------------------------------
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# Methods used in __call__. Override these methods to modify the behavior
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# of the displayhook.
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#-------------------------------------------------------------------------
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def check_for_underscore(self):
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"""Check if the user has set the '_' variable by hand."""
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# If something injected a '_' variable in __builtin__, delete
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# ipython's automatic one so we don't clobber that. gettext() in
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# particular uses _, so we need to stay away from it.
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if '_' in __builtin__.__dict__:
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try:
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del self.shell.user_ns['_']
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except KeyError:
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pass
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def quiet(self):
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"""Should we silence the display hook because of ';'?"""
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# do not print output if input ends in ';'
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try:
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if self.shell.input_hist[self.prompt_count].endswith(';\n'):
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return True
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except IndexError:
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# some uses of ipshellembed may fail here
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pass
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return False
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def start_displayhook(self):
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"""Start the displayhook, initializing resources."""
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pass
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def write_output_prompt(self):
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"""Write the output prompt."""
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# Use write, not print which adds an extra space.
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IPython.utils.io.Term.cout.write(self.output_sep)
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outprompt = str(self.prompt_out)
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if self.do_full_cache:
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IPython.utils.io.Term.cout.write(outprompt)
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# TODO: Make this method an extension point. The previous implementation
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# has both a result_display hook as well as a result_display generic
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# function to customize the repr on a per class basis. We need to rethink
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# the hooks mechanism before doing this though.
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def compute_result_repr(self, result):
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"""Compute and return the repr of the object to be displayed.
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This method only compute the string form of the repr and should NOT
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actual print or write that to a stream. This method may also transform
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the result itself, but the default implementation passes the original
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through.
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"""
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try:
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if self.shell.pprint:
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try:
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result_repr = pformat(result)
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except:
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# Work around possible bugs in pformat
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result_repr = repr(result)
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if '\n' in result_repr:
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# So that multi-line strings line up with the left column of
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# the screen, instead of having the output prompt mess up
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# their first line.
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result_repr = '\n' + result_repr
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else:
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result_repr = repr(result)
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except TypeError:
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# This happens when result.__repr__ doesn't return a string,
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# such as when it returns None.
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result_repr = '\n'
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return result, result_repr
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def write_result_repr(self, result_repr):
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# We want to print because we want to always make sure we have a
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# newline, even if all the prompt separators are ''. This is the
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# standard IPython behavior.
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print >>IPython.utils.io.Term.cout, result_repr
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def update_user_ns(self, result):
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"""Update user_ns with various things like _, __, _1, etc."""
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# Avoid recursive reference when displaying _oh/Out
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if result is not self.shell.user_ns['_oh']:
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if len(self.shell.user_ns['_oh']) >= self.cache_size and self.do_full_cache:
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warn('Output cache limit (currently '+
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`self.cache_size`+' entries) hit.\n'
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'Flushing cache and resetting history counter...\n'
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'The only history variables available will be _,__,___ and _1\n'
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'with the current result.')
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self.flush()
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# Don't overwrite '_' and friends if '_' is in __builtin__ (otherwise
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# we cause buggy behavior for things like gettext).
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if '_' not in __builtin__.__dict__:
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self.___ = self.__
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self.__ = self._
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self._ = result
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self.shell.user_ns.update({'_':self._,'__':self.__,'___':self.___})
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# hackish access to top-level namespace to create _1,_2... dynamically
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to_main = {}
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if self.do_full_cache:
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new_result = '_'+`self.prompt_count`
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to_main[new_result] = result
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self.shell.user_ns.update(to_main)
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self.shell.user_ns['_oh'][self.prompt_count] = result
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def log_output(self, result):
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"""Log the output."""
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if self.shell.logger.log_output:
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self.shell.logger.log_write(repr(result), 'output')
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def finish_displayhook(self):
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"""Finish up all displayhook activities."""
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IPython.utils.io.Term.cout.write(self.output_sep2)
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IPython.utils.io.Term.cout.flush()
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def __call__(self, result=None):
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"""Printing with history cache management.
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This is invoked everytime the interpreter needs to print, and is
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activated by setting the variable sys.displayhook to it.
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"""
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self.check_for_underscore()
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if result is not None and not self.quiet():
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self.start_displayhook()
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self.write_output_prompt()
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result, result_repr = self.compute_result_repr(result)
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self.write_result_repr(result_repr)
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self.update_user_ns(result)
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self.log_output(result)
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self.finish_displayhook()
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def flush(self):
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if not self.do_full_cache:
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raise ValueError,"You shouldn't have reached the cache flush "\
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"if full caching is not enabled!"
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# delete auto-generated vars from global namespace
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for n in range(1,self.prompt_count + 1):
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key = '_'+`n`
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try:
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del self.shell.user_ns[key]
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except: pass
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self.shell.user_ns['_oh'].clear()
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if '_' not in __builtin__.__dict__:
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self.shell.user_ns.update({'_':None,'__':None, '___':None})
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import gc
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gc.collect() # xxx needed?
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