|
|
# -*- coding: utf-8 -*-
|
|
|
"""
|
|
|
Python advanced pretty printer. This pretty printer is intended to
|
|
|
replace the old `pprint` python module which does not allow developers
|
|
|
to provide their own pretty print callbacks.
|
|
|
|
|
|
This module is based on ruby's `prettyprint.rb` library by `Tanaka Akira`.
|
|
|
|
|
|
|
|
|
Example Usage
|
|
|
-------------
|
|
|
|
|
|
To directly print the representation of an object use `pprint`::
|
|
|
|
|
|
from pretty import pprint
|
|
|
pprint(complex_object)
|
|
|
|
|
|
To get a string of the output use `pretty`::
|
|
|
|
|
|
from pretty import pretty
|
|
|
string = pretty(complex_object)
|
|
|
|
|
|
|
|
|
Extending
|
|
|
---------
|
|
|
|
|
|
The pretty library allows developers to add pretty printing rules for their
|
|
|
own objects. This process is straightforward. All you have to do is to
|
|
|
add a `_repr_pretty_` method to your object and call the methods on the
|
|
|
pretty printer passed::
|
|
|
|
|
|
class MyObject(object):
|
|
|
|
|
|
def _repr_pretty_(self, p, cycle):
|
|
|
...
|
|
|
|
|
|
Here's an example for a class with a simple constructor::
|
|
|
|
|
|
class MySimpleObject:
|
|
|
|
|
|
def __init__(self, a, b, *, c=None):
|
|
|
self.a = a
|
|
|
self.b = b
|
|
|
self.c = c
|
|
|
|
|
|
def _repr_pretty_(self, p, cycle):
|
|
|
ctor = CallExpression.factory(self.__class__.__name__)
|
|
|
if self.c is None:
|
|
|
p.pretty(ctor(a, b))
|
|
|
else:
|
|
|
p.pretty(ctor(a, b, c=c))
|
|
|
|
|
|
Here is an example implementation of a `_repr_pretty_` method for a list
|
|
|
subclass::
|
|
|
|
|
|
class MyList(list):
|
|
|
|
|
|
def _repr_pretty_(self, p, cycle):
|
|
|
if cycle:
|
|
|
p.text('MyList(...)')
|
|
|
else:
|
|
|
with p.group(8, 'MyList([', '])'):
|
|
|
for idx, item in enumerate(self):
|
|
|
if idx:
|
|
|
p.text(',')
|
|
|
p.breakable()
|
|
|
p.pretty(item)
|
|
|
|
|
|
The `cycle` parameter is `True` if pretty detected a cycle. You *have* to
|
|
|
react to that or the result is an infinite loop. `p.text()` just adds
|
|
|
non breaking text to the output, `p.breakable()` either adds a whitespace
|
|
|
or breaks here. If you pass it an argument it's used instead of the
|
|
|
default space. `p.pretty` prettyprints another object using the pretty print
|
|
|
method.
|
|
|
|
|
|
The first parameter to the `group` function specifies the extra indentation
|
|
|
of the next line. In this example the next item will either be on the same
|
|
|
line (if the items are short enough) or aligned with the right edge of the
|
|
|
opening bracket of `MyList`.
|
|
|
|
|
|
If you just want to indent something you can use the group function
|
|
|
without open / close parameters. You can also use this code::
|
|
|
|
|
|
with p.indent(2):
|
|
|
...
|
|
|
|
|
|
Inheritance diagram:
|
|
|
|
|
|
.. inheritance-diagram:: IPython.lib.pretty
|
|
|
:parts: 3
|
|
|
|
|
|
:copyright: 2007 by Armin Ronacher.
|
|
|
Portions (c) 2009 by Robert Kern.
|
|
|
:license: BSD License.
|
|
|
"""
|
|
|
|
|
|
from contextlib import contextmanager
|
|
|
import datetime
|
|
|
import os
|
|
|
import re
|
|
|
import sys
|
|
|
import types
|
|
|
from collections import deque
|
|
|
from inspect import signature
|
|
|
from io import StringIO
|
|
|
from warnings import warn
|
|
|
|
|
|
from IPython.utils.decorators import undoc
|
|
|
from IPython.utils.py3compat import PYPY
|
|
|
|
|
|
__all__ = ['pretty', 'pprint', 'PrettyPrinter', 'RepresentationPrinter',
|
|
|
'for_type', 'for_type_by_name', 'RawText', 'RawStringLiteral', 'CallExpression']
|
|
|
|
|
|
|
|
|
MAX_SEQ_LENGTH = 1000
|
|
|
_re_pattern_type = type(re.compile(''))
|
|
|
|
|
|
def _safe_getattr(obj, attr, default=None):
|
|
|
"""Safe version of getattr.
|
|
|
|
|
|
Same as getattr, but will return ``default`` on any Exception,
|
|
|
rather than raising.
|
|
|
"""
|
|
|
try:
|
|
|
return getattr(obj, attr, default)
|
|
|
except Exception:
|
|
|
return default
|
|
|
|
|
|
@undoc
|
|
|
class CUnicodeIO(StringIO):
|
|
|
def __init__(self, *args, **kwargs):
|
|
|
super().__init__(*args, **kwargs)
|
|
|
warn(("CUnicodeIO is deprecated since IPython 6.0. "
|
|
|
"Please use io.StringIO instead."),
|
|
|
DeprecationWarning, stacklevel=2)
|
|
|
|
|
|
def _sorted_for_pprint(items):
|
|
|
"""
|
|
|
Sort the given items for pretty printing. Since some predictable
|
|
|
sorting is better than no sorting at all, we sort on the string
|
|
|
representation if normal sorting fails.
|
|
|
"""
|
|
|
items = list(items)
|
|
|
try:
|
|
|
return sorted(items)
|
|
|
except Exception:
|
|
|
try:
|
|
|
return sorted(items, key=str)
|
|
|
except Exception:
|
|
|
return items
|
|
|
|
|
|
def pretty(obj, verbose=False, max_width=79, newline='\n', max_seq_length=MAX_SEQ_LENGTH):
|
|
|
"""
|
|
|
Pretty print the object's representation.
|
|
|
"""
|
|
|
stream = StringIO()
|
|
|
printer = RepresentationPrinter(stream, verbose, max_width, newline, max_seq_length=max_seq_length)
|
|
|
printer.pretty(obj)
|
|
|
printer.flush()
|
|
|
return stream.getvalue()
|
|
|
|
|
|
|
|
|
def pprint(obj, verbose=False, max_width=79, newline='\n', max_seq_length=MAX_SEQ_LENGTH):
|
|
|
"""
|
|
|
Like `pretty` but print to stdout.
|
|
|
"""
|
|
|
printer = RepresentationPrinter(sys.stdout, verbose, max_width, newline, max_seq_length=max_seq_length)
|
|
|
printer.pretty(obj)
|
|
|
printer.flush()
|
|
|
sys.stdout.write(newline)
|
|
|
sys.stdout.flush()
|
|
|
|
|
|
class _PrettyPrinterBase(object):
|
|
|
|
|
|
@contextmanager
|
|
|
def indent(self, indent):
|
|
|
"""with statement support for indenting/dedenting."""
|
|
|
self.indentation += indent
|
|
|
try:
|
|
|
yield
|
|
|
finally:
|
|
|
self.indentation -= indent
|
|
|
|
|
|
@contextmanager
|
|
|
def group(self, indent=0, open='', close=''):
|
|
|
"""like begin_group / end_group but for the with statement."""
|
|
|
self.begin_group(indent, open)
|
|
|
try:
|
|
|
yield
|
|
|
finally:
|
|
|
self.end_group(indent, close)
|
|
|
|
|
|
class PrettyPrinter(_PrettyPrinterBase):
|
|
|
"""
|
|
|
Baseclass for the `RepresentationPrinter` prettyprinter that is used to
|
|
|
generate pretty reprs of objects. Contrary to the `RepresentationPrinter`
|
|
|
this printer knows nothing about the default pprinters or the `_repr_pretty_`
|
|
|
callback method.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, output, max_width=79, newline='\n', max_seq_length=MAX_SEQ_LENGTH):
|
|
|
self.output = output
|
|
|
self.max_width = max_width
|
|
|
self.newline = newline
|
|
|
self.max_seq_length = max_seq_length
|
|
|
self.output_width = 0
|
|
|
self.buffer_width = 0
|
|
|
self.buffer = deque()
|
|
|
|
|
|
root_group = Group(0)
|
|
|
self.group_stack = [root_group]
|
|
|
self.group_queue = GroupQueue(root_group)
|
|
|
self.indentation = 0
|
|
|
|
|
|
def _break_one_group(self, group):
|
|
|
while group.breakables:
|
|
|
x = self.buffer.popleft()
|
|
|
self.output_width = x.output(self.output, self.output_width)
|
|
|
self.buffer_width -= x.width
|
|
|
while self.buffer and isinstance(self.buffer[0], Text):
|
|
|
x = self.buffer.popleft()
|
|
|
self.output_width = x.output(self.output, self.output_width)
|
|
|
self.buffer_width -= x.width
|
|
|
|
|
|
def _break_outer_groups(self):
|
|
|
while self.max_width < self.output_width + self.buffer_width:
|
|
|
group = self.group_queue.deq()
|
|
|
if not group:
|
|
|
return
|
|
|
self._break_one_group(group)
|
|
|
|
|
|
def text(self, obj):
|
|
|
"""Add literal text to the output."""
|
|
|
width = len(obj)
|
|
|
if self.buffer:
|
|
|
text = self.buffer[-1]
|
|
|
if not isinstance(text, Text):
|
|
|
text = Text()
|
|
|
self.buffer.append(text)
|
|
|
text.add(obj, width)
|
|
|
self.buffer_width += width
|
|
|
self._break_outer_groups()
|
|
|
else:
|
|
|
self.output.write(obj)
|
|
|
self.output_width += width
|
|
|
|
|
|
def breakable(self, sep=' '):
|
|
|
"""
|
|
|
Add a breakable separator to the output. This does not mean that it
|
|
|
will automatically break here. If no breaking on this position takes
|
|
|
place the `sep` is inserted which default to one space.
|
|
|
"""
|
|
|
width = len(sep)
|
|
|
group = self.group_stack[-1]
|
|
|
if group.want_break:
|
|
|
self.flush()
|
|
|
self.output.write(self.newline)
|
|
|
self.output.write(' ' * self.indentation)
|
|
|
self.output_width = self.indentation
|
|
|
self.buffer_width = 0
|
|
|
else:
|
|
|
self.buffer.append(Breakable(sep, width, self))
|
|
|
self.buffer_width += width
|
|
|
self._break_outer_groups()
|
|
|
|
|
|
def break_(self):
|
|
|
"""
|
|
|
Explicitly insert a newline into the output, maintaining correct indentation.
|
|
|
"""
|
|
|
group = self.group_queue.deq()
|
|
|
if group:
|
|
|
self._break_one_group(group)
|
|
|
self.flush()
|
|
|
self.output.write(self.newline)
|
|
|
self.output.write(' ' * self.indentation)
|
|
|
self.output_width = self.indentation
|
|
|
self.buffer_width = 0
|
|
|
|
|
|
|
|
|
def begin_group(self, indent=0, open=''):
|
|
|
"""
|
|
|
Begin a group.
|
|
|
The first parameter specifies the indentation for the next line (usually
|
|
|
the width of the opening text), the second the opening text. All
|
|
|
parameters are optional.
|
|
|
"""
|
|
|
if open:
|
|
|
self.text(open)
|
|
|
group = Group(self.group_stack[-1].depth + 1)
|
|
|
self.group_stack.append(group)
|
|
|
self.group_queue.enq(group)
|
|
|
self.indentation += indent
|
|
|
|
|
|
def _enumerate(self, seq):
|
|
|
"""like enumerate, but with an upper limit on the number of items"""
|
|
|
for idx, x in enumerate(seq):
|
|
|
if self.max_seq_length and idx >= self.max_seq_length:
|
|
|
self.text(',')
|
|
|
self.breakable()
|
|
|
self.text('...')
|
|
|
return
|
|
|
yield idx, x
|
|
|
|
|
|
def end_group(self, dedent=0, close=''):
|
|
|
"""End a group. See `begin_group` for more details."""
|
|
|
self.indentation -= dedent
|
|
|
group = self.group_stack.pop()
|
|
|
if not group.breakables:
|
|
|
self.group_queue.remove(group)
|
|
|
if close:
|
|
|
self.text(close)
|
|
|
|
|
|
def flush(self):
|
|
|
"""Flush data that is left in the buffer."""
|
|
|
for data in self.buffer:
|
|
|
self.output_width += data.output(self.output, self.output_width)
|
|
|
self.buffer.clear()
|
|
|
self.buffer_width = 0
|
|
|
|
|
|
|
|
|
def _get_mro(obj_class):
|
|
|
""" Get a reasonable method resolution order of a class and its superclasses
|
|
|
for both old-style and new-style classes.
|
|
|
"""
|
|
|
if not hasattr(obj_class, '__mro__'):
|
|
|
# Old-style class. Mix in object to make a fake new-style class.
|
|
|
try:
|
|
|
obj_class = type(obj_class.__name__, (obj_class, object), {})
|
|
|
except TypeError:
|
|
|
# Old-style extension type that does not descend from object.
|
|
|
# FIXME: try to construct a more thorough MRO.
|
|
|
mro = [obj_class]
|
|
|
else:
|
|
|
mro = obj_class.__mro__[1:-1]
|
|
|
else:
|
|
|
mro = obj_class.__mro__
|
|
|
return mro
|
|
|
|
|
|
|
|
|
class RepresentationPrinter(PrettyPrinter):
|
|
|
"""
|
|
|
Special pretty printer that has a `pretty` method that calls the pretty
|
|
|
printer for a python object.
|
|
|
|
|
|
This class stores processing data on `self` so you must *never* use
|
|
|
this class in a threaded environment. Always lock it or reinstanciate
|
|
|
it.
|
|
|
|
|
|
Instances also have a verbose flag callbacks can access to control their
|
|
|
output. For example the default instance repr prints all attributes and
|
|
|
methods that are not prefixed by an underscore if the printer is in
|
|
|
verbose mode.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, output, verbose=False, max_width=79, newline='\n',
|
|
|
singleton_pprinters=None, type_pprinters=None, deferred_pprinters=None,
|
|
|
max_seq_length=MAX_SEQ_LENGTH):
|
|
|
|
|
|
PrettyPrinter.__init__(self, output, max_width, newline, max_seq_length=max_seq_length)
|
|
|
self.verbose = verbose
|
|
|
self.stack = []
|
|
|
if singleton_pprinters is None:
|
|
|
singleton_pprinters = _singleton_pprinters.copy()
|
|
|
self.singleton_pprinters = singleton_pprinters
|
|
|
if type_pprinters is None:
|
|
|
type_pprinters = _type_pprinters.copy()
|
|
|
self.type_pprinters = type_pprinters
|
|
|
if deferred_pprinters is None:
|
|
|
deferred_pprinters = _deferred_type_pprinters.copy()
|
|
|
self.deferred_pprinters = deferred_pprinters
|
|
|
|
|
|
def pretty(self, obj):
|
|
|
"""Pretty print the given object."""
|
|
|
obj_id = id(obj)
|
|
|
cycle = obj_id in self.stack
|
|
|
self.stack.append(obj_id)
|
|
|
self.begin_group()
|
|
|
try:
|
|
|
obj_class = _safe_getattr(obj, '__class__', None) or type(obj)
|
|
|
# First try to find registered singleton printers for the type.
|
|
|
try:
|
|
|
printer = self.singleton_pprinters[obj_id]
|
|
|
except (TypeError, KeyError):
|
|
|
pass
|
|
|
else:
|
|
|
return printer(obj, self, cycle)
|
|
|
# Next walk the mro and check for either:
|
|
|
# 1) a registered printer
|
|
|
# 2) a _repr_pretty_ method
|
|
|
for cls in _get_mro(obj_class):
|
|
|
if cls in self.type_pprinters:
|
|
|
# printer registered in self.type_pprinters
|
|
|
return self.type_pprinters[cls](obj, self, cycle)
|
|
|
else:
|
|
|
# deferred printer
|
|
|
printer = self._in_deferred_types(cls)
|
|
|
if printer is not None:
|
|
|
return printer(obj, self, cycle)
|
|
|
else:
|
|
|
# Finally look for special method names.
|
|
|
# Some objects automatically create any requested
|
|
|
# attribute. Try to ignore most of them by checking for
|
|
|
# callability.
|
|
|
if '_repr_pretty_' in cls.__dict__:
|
|
|
meth = cls._repr_pretty_
|
|
|
if callable(meth):
|
|
|
return meth(obj, self, cycle)
|
|
|
if cls is not object \
|
|
|
and callable(cls.__dict__.get('__repr__')):
|
|
|
return _repr_pprint(obj, self, cycle)
|
|
|
|
|
|
return _default_pprint(obj, self, cycle)
|
|
|
finally:
|
|
|
self.end_group()
|
|
|
self.stack.pop()
|
|
|
|
|
|
def _in_deferred_types(self, cls):
|
|
|
"""
|
|
|
Check if the given class is specified in the deferred type registry.
|
|
|
|
|
|
Returns the printer from the registry if it exists, and None if the
|
|
|
class is not in the registry. Successful matches will be moved to the
|
|
|
regular type registry for future use.
|
|
|
"""
|
|
|
mod = _safe_getattr(cls, '__module__', None)
|
|
|
name = _safe_getattr(cls, '__name__', None)
|
|
|
key = (mod, name)
|
|
|
printer = None
|
|
|
if key in self.deferred_pprinters:
|
|
|
# Move the printer over to the regular registry.
|
|
|
printer = self.deferred_pprinters.pop(key)
|
|
|
self.type_pprinters[cls] = printer
|
|
|
return printer
|
|
|
|
|
|
|
|
|
class Printable(object):
|
|
|
|
|
|
def output(self, stream, output_width):
|
|
|
return output_width
|
|
|
|
|
|
|
|
|
class Text(Printable):
|
|
|
|
|
|
def __init__(self):
|
|
|
self.objs = []
|
|
|
self.width = 0
|
|
|
|
|
|
def output(self, stream, output_width):
|
|
|
for obj in self.objs:
|
|
|
stream.write(obj)
|
|
|
return output_width + self.width
|
|
|
|
|
|
def add(self, obj, width):
|
|
|
self.objs.append(obj)
|
|
|
self.width += width
|
|
|
|
|
|
|
|
|
class Breakable(Printable):
|
|
|
|
|
|
def __init__(self, seq, width, pretty):
|
|
|
self.obj = seq
|
|
|
self.width = width
|
|
|
self.pretty = pretty
|
|
|
self.indentation = pretty.indentation
|
|
|
self.group = pretty.group_stack[-1]
|
|
|
self.group.breakables.append(self)
|
|
|
|
|
|
def output(self, stream, output_width):
|
|
|
self.group.breakables.popleft()
|
|
|
if self.group.want_break:
|
|
|
stream.write(self.pretty.newline)
|
|
|
stream.write(' ' * self.indentation)
|
|
|
return self.indentation
|
|
|
if not self.group.breakables:
|
|
|
self.pretty.group_queue.remove(self.group)
|
|
|
stream.write(self.obj)
|
|
|
return output_width + self.width
|
|
|
|
|
|
|
|
|
class Group(Printable):
|
|
|
|
|
|
def __init__(self, depth):
|
|
|
self.depth = depth
|
|
|
self.breakables = deque()
|
|
|
self.want_break = False
|
|
|
|
|
|
|
|
|
class GroupQueue(object):
|
|
|
|
|
|
def __init__(self, *groups):
|
|
|
self.queue = []
|
|
|
for group in groups:
|
|
|
self.enq(group)
|
|
|
|
|
|
def enq(self, group):
|
|
|
depth = group.depth
|
|
|
while depth > len(self.queue) - 1:
|
|
|
self.queue.append([])
|
|
|
self.queue[depth].append(group)
|
|
|
|
|
|
def deq(self):
|
|
|
for stack in self.queue:
|
|
|
for idx, group in enumerate(reversed(stack)):
|
|
|
if group.breakables:
|
|
|
del stack[idx]
|
|
|
group.want_break = True
|
|
|
return group
|
|
|
for group in stack:
|
|
|
group.want_break = True
|
|
|
del stack[:]
|
|
|
|
|
|
def remove(self, group):
|
|
|
try:
|
|
|
self.queue[group.depth].remove(group)
|
|
|
except ValueError:
|
|
|
pass
|
|
|
|
|
|
|
|
|
class RawText:
|
|
|
""" Object such that ``p.pretty(RawText(value))`` is the same as ``p.text(value)``.
|
|
|
|
|
|
An example usage of this would be to show a list as binary numbers, using
|
|
|
``p.pretty([RawText(bin(i)) for i in integers])``.
|
|
|
"""
|
|
|
def __init__(self, value):
|
|
|
self.value = value
|
|
|
|
|
|
def _repr_pretty_(self, p, cycle):
|
|
|
p.text(self.value)
|
|
|
|
|
|
|
|
|
class CallExpression:
|
|
|
""" Object which emits a line-wrapped call expression in the form `__name(*args, **kwargs)` """
|
|
|
def __init__(__self, __name, *args, **kwargs):
|
|
|
# dunders are to avoid clashes with kwargs, as python's name manging
|
|
|
# will kick in.
|
|
|
self = __self
|
|
|
self.name = __name
|
|
|
self.args = args
|
|
|
self.kwargs = kwargs
|
|
|
|
|
|
@classmethod
|
|
|
def factory(cls, name):
|
|
|
def inner(*args, **kwargs):
|
|
|
return cls(name, *args, **kwargs)
|
|
|
return inner
|
|
|
|
|
|
def _repr_pretty_(self, p, cycle):
|
|
|
# dunders are to avoid clashes with kwargs, as python's name manging
|
|
|
# will kick in.
|
|
|
|
|
|
started = False
|
|
|
def new_item():
|
|
|
nonlocal started
|
|
|
if started:
|
|
|
p.text(",")
|
|
|
p.breakable()
|
|
|
started = True
|
|
|
|
|
|
prefix = self.name + "("
|
|
|
with p.group(len(prefix), prefix, ")"):
|
|
|
for arg in self.args:
|
|
|
new_item()
|
|
|
p.pretty(arg)
|
|
|
for arg_name, arg in self.kwargs.items():
|
|
|
new_item()
|
|
|
arg_prefix = arg_name + "="
|
|
|
with p.group(len(arg_prefix), arg_prefix):
|
|
|
p.pretty(arg)
|
|
|
|
|
|
|
|
|
class RawStringLiteral:
|
|
|
""" Wrapper that shows a string with a `r` prefix """
|
|
|
def __init__(self, value):
|
|
|
self.value = value
|
|
|
|
|
|
def _repr_pretty_(self, p, cycle):
|
|
|
base_repr = repr(self.value)
|
|
|
if base_repr[:1] in 'uU':
|
|
|
base_repr = base_repr[1:]
|
|
|
prefix = 'ur'
|
|
|
else:
|
|
|
prefix = 'r'
|
|
|
base_repr = prefix + base_repr.replace('\\\\', '\\')
|
|
|
p.text(base_repr)
|
|
|
|
|
|
|
|
|
def _default_pprint(obj, p, cycle):
|
|
|
"""
|
|
|
The default print function. Used if an object does not provide one and
|
|
|
it's none of the builtin objects.
|
|
|
"""
|
|
|
klass = _safe_getattr(obj, '__class__', None) or type(obj)
|
|
|
if _safe_getattr(klass, '__repr__', None) is not object.__repr__:
|
|
|
# A user-provided repr. Find newlines and replace them with p.break_()
|
|
|
_repr_pprint(obj, p, cycle)
|
|
|
return
|
|
|
p.begin_group(1, '<')
|
|
|
p.pretty(klass)
|
|
|
p.text(' at 0x%x' % id(obj))
|
|
|
if cycle:
|
|
|
p.text(' ...')
|
|
|
elif p.verbose:
|
|
|
first = True
|
|
|
for key in dir(obj):
|
|
|
if not key.startswith('_'):
|
|
|
try:
|
|
|
value = getattr(obj, key)
|
|
|
except AttributeError:
|
|
|
continue
|
|
|
if isinstance(value, types.MethodType):
|
|
|
continue
|
|
|
if not first:
|
|
|
p.text(',')
|
|
|
p.breakable()
|
|
|
p.text(key)
|
|
|
p.text('=')
|
|
|
step = len(key) + 1
|
|
|
p.indentation += step
|
|
|
p.pretty(value)
|
|
|
p.indentation -= step
|
|
|
first = False
|
|
|
p.end_group(1, '>')
|
|
|
|
|
|
|
|
|
def _seq_pprinter_factory(start, end):
|
|
|
"""
|
|
|
Factory that returns a pprint function useful for sequences. Used by
|
|
|
the default pprint for tuples and lists.
|
|
|
"""
|
|
|
def inner(obj, p, cycle):
|
|
|
if cycle:
|
|
|
return p.text(start + '...' + end)
|
|
|
step = len(start)
|
|
|
p.begin_group(step, start)
|
|
|
for idx, x in p._enumerate(obj):
|
|
|
if idx:
|
|
|
p.text(',')
|
|
|
p.breakable()
|
|
|
p.pretty(x)
|
|
|
if len(obj) == 1 and isinstance(obj, tuple):
|
|
|
# Special case for 1-item tuples.
|
|
|
p.text(',')
|
|
|
p.end_group(step, end)
|
|
|
return inner
|
|
|
|
|
|
|
|
|
def _set_pprinter_factory(start, end):
|
|
|
"""
|
|
|
Factory that returns a pprint function useful for sets and frozensets.
|
|
|
"""
|
|
|
def inner(obj, p, cycle):
|
|
|
if cycle:
|
|
|
return p.text(start + '...' + end)
|
|
|
if len(obj) == 0:
|
|
|
# Special case.
|
|
|
p.text(type(obj).__name__ + '()')
|
|
|
else:
|
|
|
step = len(start)
|
|
|
p.begin_group(step, start)
|
|
|
# Like dictionary keys, we will try to sort the items if there aren't too many
|
|
|
if not (p.max_seq_length and len(obj) >= p.max_seq_length):
|
|
|
items = _sorted_for_pprint(obj)
|
|
|
else:
|
|
|
items = obj
|
|
|
for idx, x in p._enumerate(items):
|
|
|
if idx:
|
|
|
p.text(',')
|
|
|
p.breakable()
|
|
|
p.pretty(x)
|
|
|
p.end_group(step, end)
|
|
|
return inner
|
|
|
|
|
|
|
|
|
def _dict_pprinter_factory(start, end):
|
|
|
"""
|
|
|
Factory that returns a pprint function used by the default pprint of
|
|
|
dicts and dict proxies.
|
|
|
"""
|
|
|
def inner(obj, p, cycle):
|
|
|
if cycle:
|
|
|
return p.text('{...}')
|
|
|
step = len(start)
|
|
|
p.begin_group(step, start)
|
|
|
keys = obj.keys()
|
|
|
for idx, key in p._enumerate(keys):
|
|
|
if idx:
|
|
|
p.text(',')
|
|
|
p.breakable()
|
|
|
p.pretty(key)
|
|
|
p.text(': ')
|
|
|
p.pretty(obj[key])
|
|
|
p.end_group(step, end)
|
|
|
return inner
|
|
|
|
|
|
|
|
|
def _super_pprint(obj, p, cycle):
|
|
|
"""The pprint for the super type."""
|
|
|
p.begin_group(8, '<super: ')
|
|
|
p.pretty(obj.__thisclass__)
|
|
|
p.text(',')
|
|
|
p.breakable()
|
|
|
if PYPY: # In PyPy, super() objects don't have __self__ attributes
|
|
|
dself = obj.__repr__.__self__
|
|
|
p.pretty(None if dself is obj else dself)
|
|
|
else:
|
|
|
p.pretty(obj.__self__)
|
|
|
p.end_group(8, '>')
|
|
|
|
|
|
|
|
|
|
|
|
class _ReFlags:
|
|
|
def __init__(self, value):
|
|
|
self.value = value
|
|
|
|
|
|
def _repr_pretty_(self, p, cycle):
|
|
|
done_one = False
|
|
|
for flag in ('TEMPLATE', 'IGNORECASE', 'LOCALE', 'MULTILINE', 'DOTALL',
|
|
|
'UNICODE', 'VERBOSE', 'DEBUG'):
|
|
|
if self.value & getattr(re, flag):
|
|
|
if done_one:
|
|
|
p.text('|')
|
|
|
p.text('re.' + flag)
|
|
|
done_one = True
|
|
|
|
|
|
|
|
|
def _re_pattern_pprint(obj, p, cycle):
|
|
|
"""The pprint function for regular expression patterns."""
|
|
|
re_compile = CallExpression.factory('re.compile')
|
|
|
if obj.flags:
|
|
|
p.pretty(re_compile(RawStringLiteral(obj.pattern), _ReFlags(obj.flags)))
|
|
|
else:
|
|
|
p.pretty(re_compile(RawStringLiteral(obj.pattern)))
|
|
|
|
|
|
|
|
|
def _types_simplenamespace_pprint(obj, p, cycle):
|
|
|
"""The pprint function for types.SimpleNamespace."""
|
|
|
namespace = CallExpression.factory('namespace')
|
|
|
if cycle:
|
|
|
p.pretty(namespace(RawText("...")))
|
|
|
else:
|
|
|
p.pretty(namespace(**obj.__dict__))
|
|
|
|
|
|
|
|
|
def _type_pprint(obj, p, cycle):
|
|
|
"""The pprint for classes and types."""
|
|
|
# Heap allocated types might not have the module attribute,
|
|
|
# and others may set it to None.
|
|
|
|
|
|
# Checks for a __repr__ override in the metaclass. Can't compare the
|
|
|
# type(obj).__repr__ directly because in PyPy the representation function
|
|
|
# inherited from type isn't the same type.__repr__
|
|
|
if [m for m in _get_mro(type(obj)) if "__repr__" in vars(m)][:1] != [type]:
|
|
|
_repr_pprint(obj, p, cycle)
|
|
|
return
|
|
|
|
|
|
mod = _safe_getattr(obj, '__module__', None)
|
|
|
try:
|
|
|
name = obj.__qualname__
|
|
|
if not isinstance(name, str):
|
|
|
# This can happen if the type implements __qualname__ as a property
|
|
|
# or other descriptor in Python 2.
|
|
|
raise Exception("Try __name__")
|
|
|
except Exception:
|
|
|
name = obj.__name__
|
|
|
if not isinstance(name, str):
|
|
|
name = '<unknown type>'
|
|
|
|
|
|
if mod in (None, '__builtin__', 'builtins', 'exceptions'):
|
|
|
p.text(name)
|
|
|
else:
|
|
|
p.text(mod + '.' + name)
|
|
|
|
|
|
|
|
|
def _repr_pprint(obj, p, cycle):
|
|
|
"""A pprint that just redirects to the normal repr function."""
|
|
|
# Find newlines and replace them with p.break_()
|
|
|
output = repr(obj)
|
|
|
lines = output.splitlines()
|
|
|
with p.group():
|
|
|
for idx, output_line in enumerate(lines):
|
|
|
if idx:
|
|
|
p.break_()
|
|
|
p.text(output_line)
|
|
|
|
|
|
|
|
|
def _function_pprint(obj, p, cycle):
|
|
|
"""Base pprint for all functions and builtin functions."""
|
|
|
name = _safe_getattr(obj, '__qualname__', obj.__name__)
|
|
|
mod = obj.__module__
|
|
|
if mod and mod not in ('__builtin__', 'builtins', 'exceptions'):
|
|
|
name = mod + '.' + name
|
|
|
try:
|
|
|
func_def = name + str(signature(obj))
|
|
|
except ValueError:
|
|
|
func_def = name
|
|
|
p.text('<function %s>' % func_def)
|
|
|
|
|
|
|
|
|
def _exception_pprint(obj, p, cycle):
|
|
|
"""Base pprint for all exceptions."""
|
|
|
name = getattr(obj.__class__, '__qualname__', obj.__class__.__name__)
|
|
|
if obj.__class__.__module__ not in ('exceptions', 'builtins'):
|
|
|
name = '%s.%s' % (obj.__class__.__module__, name)
|
|
|
|
|
|
p.pretty(CallExpression(name, *getattr(obj, 'args', ())))
|
|
|
|
|
|
|
|
|
#: the exception base
|
|
|
try:
|
|
|
_exception_base = BaseException
|
|
|
except NameError:
|
|
|
_exception_base = Exception
|
|
|
|
|
|
|
|
|
#: printers for builtin types
|
|
|
_type_pprinters = {
|
|
|
int: _repr_pprint,
|
|
|
float: _repr_pprint,
|
|
|
str: _repr_pprint,
|
|
|
tuple: _seq_pprinter_factory('(', ')'),
|
|
|
list: _seq_pprinter_factory('[', ']'),
|
|
|
dict: _dict_pprinter_factory('{', '}'),
|
|
|
set: _set_pprinter_factory('{', '}'),
|
|
|
frozenset: _set_pprinter_factory('frozenset({', '})'),
|
|
|
super: _super_pprint,
|
|
|
_re_pattern_type: _re_pattern_pprint,
|
|
|
type: _type_pprint,
|
|
|
types.FunctionType: _function_pprint,
|
|
|
types.BuiltinFunctionType: _function_pprint,
|
|
|
types.MethodType: _repr_pprint,
|
|
|
types.SimpleNamespace: _types_simplenamespace_pprint,
|
|
|
datetime.datetime: _repr_pprint,
|
|
|
datetime.timedelta: _repr_pprint,
|
|
|
_exception_base: _exception_pprint
|
|
|
}
|
|
|
|
|
|
# render os.environ like a dict
|
|
|
_env_type = type(os.environ)
|
|
|
# future-proof in case os.environ becomes a plain dict?
|
|
|
if _env_type is not dict:
|
|
|
_type_pprinters[_env_type] = _dict_pprinter_factory('environ{', '}')
|
|
|
|
|
|
try:
|
|
|
# In PyPy, types.DictProxyType is dict, setting the dictproxy printer
|
|
|
# using dict.setdefault avoids overwriting the dict printer
|
|
|
_type_pprinters.setdefault(types.DictProxyType,
|
|
|
_dict_pprinter_factory('dict_proxy({', '})'))
|
|
|
_type_pprinters[types.ClassType] = _type_pprint
|
|
|
_type_pprinters[types.SliceType] = _repr_pprint
|
|
|
except AttributeError: # Python 3
|
|
|
_type_pprinters[types.MappingProxyType] = \
|
|
|
_dict_pprinter_factory('mappingproxy({', '})')
|
|
|
_type_pprinters[slice] = _repr_pprint
|
|
|
|
|
|
_type_pprinters[range] = _repr_pprint
|
|
|
_type_pprinters[bytes] = _repr_pprint
|
|
|
|
|
|
#: printers for types specified by name
|
|
|
_deferred_type_pprinters = {
|
|
|
}
|
|
|
|
|
|
def for_type(typ, func):
|
|
|
"""
|
|
|
Add a pretty printer for a given type.
|
|
|
"""
|
|
|
oldfunc = _type_pprinters.get(typ, None)
|
|
|
if func is not None:
|
|
|
# To support easy restoration of old pprinters, we need to ignore Nones.
|
|
|
_type_pprinters[typ] = func
|
|
|
return oldfunc
|
|
|
|
|
|
def for_type_by_name(type_module, type_name, func):
|
|
|
"""
|
|
|
Add a pretty printer for a type specified by the module and name of a type
|
|
|
rather than the type object itself.
|
|
|
"""
|
|
|
key = (type_module, type_name)
|
|
|
oldfunc = _deferred_type_pprinters.get(key, None)
|
|
|
if func is not None:
|
|
|
# To support easy restoration of old pprinters, we need to ignore Nones.
|
|
|
_deferred_type_pprinters[key] = func
|
|
|
return oldfunc
|
|
|
|
|
|
|
|
|
#: printers for the default singletons
|
|
|
_singleton_pprinters = dict.fromkeys(map(id, [None, True, False, Ellipsis,
|
|
|
NotImplemented]), _repr_pprint)
|
|
|
|
|
|
|
|
|
def _defaultdict_pprint(obj, p, cycle):
|
|
|
cls_ctor = CallExpression.factory(obj.__class__.__name__)
|
|
|
if cycle:
|
|
|
p.pretty(cls_ctor(RawText("...")))
|
|
|
else:
|
|
|
p.pretty(cls_ctor(obj.default_factory, dict(obj)))
|
|
|
|
|
|
def _ordereddict_pprint(obj, p, cycle):
|
|
|
cls_ctor = CallExpression.factory(obj.__class__.__name__)
|
|
|
if cycle:
|
|
|
p.pretty(cls_ctor(RawText("...")))
|
|
|
elif len(obj):
|
|
|
p.pretty(cls_ctor(list(obj.items())))
|
|
|
else:
|
|
|
p.pretty(cls_ctor())
|
|
|
|
|
|
def _deque_pprint(obj, p, cycle):
|
|
|
cls_ctor = CallExpression.factory(obj.__class__.__name__)
|
|
|
if cycle:
|
|
|
p.pretty(cls_ctor(RawText("...")))
|
|
|
else:
|
|
|
p.pretty(cls_ctor(list(obj)))
|
|
|
|
|
|
def _counter_pprint(obj, p, cycle):
|
|
|
cls_ctor = CallExpression.factory(obj.__class__.__name__)
|
|
|
if cycle:
|
|
|
p.pretty(cls_ctor(RawText("...")))
|
|
|
elif len(obj):
|
|
|
p.pretty(cls_ctor(dict(obj)))
|
|
|
else:
|
|
|
p.pretty(cls_ctor())
|
|
|
|
|
|
for_type_by_name('collections', 'defaultdict', _defaultdict_pprint)
|
|
|
for_type_by_name('collections', 'OrderedDict', _ordereddict_pprint)
|
|
|
for_type_by_name('collections', 'deque', _deque_pprint)
|
|
|
for_type_by_name('collections', 'Counter', _counter_pprint)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
|
from random import randrange
|
|
|
class Foo(object):
|
|
|
def __init__(self):
|
|
|
self.foo = 1
|
|
|
self.bar = re.compile(r'\s+')
|
|
|
self.blub = dict.fromkeys(range(30), randrange(1, 40))
|
|
|
self.hehe = 23424.234234
|
|
|
self.list = ["blub", "blah", self]
|
|
|
|
|
|
def get_foo(self):
|
|
|
print("foo")
|
|
|
|
|
|
pprint(Foo(), verbose=True)
|
|
|
|
