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build test
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297
venv/lib/python3.7/site-packages/werkzeug/debug/repr.py
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297
venv/lib/python3.7/site-packages/werkzeug/debug/repr.py
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# -*- coding: utf-8 -*-
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"""
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werkzeug.debug.repr
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~~~~~~~~~~~~~~~~~~~
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This module implements object representations for debugging purposes.
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Unlike the default repr these reprs expose a lot more information and
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produce HTML instead of ASCII.
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Together with the CSS and JavaScript files of the debugger this gives
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a colorful and more compact output.
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:copyright: 2007 Pallets
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:license: BSD-3-Clause
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"""
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import codecs
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import re
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import sys
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from collections import deque
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from traceback import format_exception_only
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from .._compat import integer_types
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from .._compat import iteritems
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from .._compat import PY2
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from .._compat import string_types
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from .._compat import text_type
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from ..utils import escape
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missing = object()
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_paragraph_re = re.compile(r"(?:\r\n|\r|\n){2,}")
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RegexType = type(_paragraph_re)
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HELP_HTML = """\
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<div class=box>
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<h3>%(title)s</h3>
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<pre class=help>%(text)s</pre>
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</div>\
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"""
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OBJECT_DUMP_HTML = """\
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<div class=box>
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<h3>%(title)s</h3>
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%(repr)s
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<table>%(items)s</table>
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</div>\
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"""
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def debug_repr(obj):
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"""Creates a debug repr of an object as HTML unicode string."""
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return DebugReprGenerator().repr(obj)
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def dump(obj=missing):
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"""Print the object details to stdout._write (for the interactive
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console of the web debugger.
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"""
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gen = DebugReprGenerator()
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if obj is missing:
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rv = gen.dump_locals(sys._getframe(1).f_locals)
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else:
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rv = gen.dump_object(obj)
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sys.stdout._write(rv)
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class _Helper(object):
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"""Displays an HTML version of the normal help, for the interactive
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debugger only because it requires a patched sys.stdout.
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"""
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def __repr__(self):
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return "Type help(object) for help about object."
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def __call__(self, topic=None):
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if topic is None:
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sys.stdout._write("<span class=help>%s</span>" % repr(self))
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return
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import pydoc
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pydoc.help(topic)
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rv = sys.stdout.reset()
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if isinstance(rv, bytes):
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rv = rv.decode("utf-8", "ignore")
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paragraphs = _paragraph_re.split(rv)
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if len(paragraphs) > 1:
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title = paragraphs[0]
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text = "\n\n".join(paragraphs[1:])
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else: # pragma: no cover
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title = "Help"
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text = paragraphs[0]
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sys.stdout._write(HELP_HTML % {"title": title, "text": text})
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helper = _Helper()
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def _add_subclass_info(inner, obj, base):
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if isinstance(base, tuple):
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for base in base:
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if type(obj) is base:
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return inner
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elif type(obj) is base:
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return inner
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module = ""
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if obj.__class__.__module__ not in ("__builtin__", "exceptions"):
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module = '<span class="module">%s.</span>' % obj.__class__.__module__
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return "%s%s(%s)" % (module, obj.__class__.__name__, inner)
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class DebugReprGenerator(object):
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def __init__(self):
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self._stack = []
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def _sequence_repr_maker(left, right, base=object(), limit=8): # noqa: B008, B902
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def proxy(self, obj, recursive):
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if recursive:
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return _add_subclass_info(left + "..." + right, obj, base)
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buf = [left]
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have_extended_section = False
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for idx, item in enumerate(obj):
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if idx:
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buf.append(", ")
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if idx == limit:
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buf.append('<span class="extended">')
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have_extended_section = True
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buf.append(self.repr(item))
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if have_extended_section:
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buf.append("</span>")
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buf.append(right)
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return _add_subclass_info(u"".join(buf), obj, base)
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return proxy
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list_repr = _sequence_repr_maker("[", "]", list)
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tuple_repr = _sequence_repr_maker("(", ")", tuple)
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set_repr = _sequence_repr_maker("set([", "])", set)
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frozenset_repr = _sequence_repr_maker("frozenset([", "])", frozenset)
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deque_repr = _sequence_repr_maker(
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'<span class="module">collections.' "</span>deque([", "])", deque
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)
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del _sequence_repr_maker
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def regex_repr(self, obj):
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pattern = repr(obj.pattern)
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if PY2:
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pattern = pattern.decode("string-escape", "ignore")
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else:
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pattern = codecs.decode(pattern, "unicode-escape", "ignore")
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if pattern[:1] == "u":
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pattern = "ur" + pattern[1:]
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else:
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pattern = "r" + pattern
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return u're.compile(<span class="string regex">%s</span>)' % pattern
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def string_repr(self, obj, limit=70):
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buf = ['<span class="string">']
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r = repr(obj)
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# shorten the repr when the hidden part would be at least 3 chars
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if len(r) - limit > 2:
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buf.extend(
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(
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escape(r[:limit]),
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'<span class="extended">',
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escape(r[limit:]),
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"</span>",
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)
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)
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else:
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buf.append(escape(r))
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buf.append("</span>")
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out = u"".join(buf)
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# if the repr looks like a standard string, add subclass info if needed
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if r[0] in "'\"" or (r[0] in "ub" and r[1] in "'\""):
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return _add_subclass_info(out, obj, (bytes, text_type))
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# otherwise, assume the repr distinguishes the subclass already
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return out
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def dict_repr(self, d, recursive, limit=5):
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if recursive:
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return _add_subclass_info(u"{...}", d, dict)
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buf = ["{"]
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have_extended_section = False
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for idx, (key, value) in enumerate(iteritems(d)):
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if idx:
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buf.append(", ")
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if idx == limit - 1:
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buf.append('<span class="extended">')
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have_extended_section = True
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buf.append(
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'<span class="pair"><span class="key">%s</span>: '
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'<span class="value">%s</span></span>'
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% (self.repr(key), self.repr(value))
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)
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if have_extended_section:
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buf.append("</span>")
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buf.append("}")
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return _add_subclass_info(u"".join(buf), d, dict)
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def object_repr(self, obj):
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r = repr(obj)
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if PY2:
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r = r.decode("utf-8", "replace")
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return u'<span class="object">%s</span>' % escape(r)
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def dispatch_repr(self, obj, recursive):
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if obj is helper:
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return u'<span class="help">%r</span>' % helper
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if isinstance(obj, (integer_types, float, complex)):
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return u'<span class="number">%r</span>' % obj
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if isinstance(obj, string_types) or isinstance(obj, bytes):
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return self.string_repr(obj)
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if isinstance(obj, RegexType):
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return self.regex_repr(obj)
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if isinstance(obj, list):
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return self.list_repr(obj, recursive)
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if isinstance(obj, tuple):
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return self.tuple_repr(obj, recursive)
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if isinstance(obj, set):
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return self.set_repr(obj, recursive)
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if isinstance(obj, frozenset):
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return self.frozenset_repr(obj, recursive)
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if isinstance(obj, dict):
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return self.dict_repr(obj, recursive)
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if deque is not None and isinstance(obj, deque):
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return self.deque_repr(obj, recursive)
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return self.object_repr(obj)
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def fallback_repr(self):
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try:
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info = "".join(format_exception_only(*sys.exc_info()[:2]))
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except Exception: # pragma: no cover
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info = "?"
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if PY2:
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info = info.decode("utf-8", "ignore")
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return u'<span class="brokenrepr"><broken repr (%s)>' u"</span>" % escape(
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info.strip()
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)
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def repr(self, obj):
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recursive = False
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for item in self._stack:
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if item is obj:
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recursive = True
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break
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self._stack.append(obj)
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try:
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try:
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return self.dispatch_repr(obj, recursive)
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except Exception:
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return self.fallback_repr()
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finally:
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self._stack.pop()
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def dump_object(self, obj):
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repr = items = None
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if isinstance(obj, dict):
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title = "Contents of"
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items = []
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for key, value in iteritems(obj):
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if not isinstance(key, string_types):
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items = None
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break
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items.append((key, self.repr(value)))
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if items is None:
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items = []
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repr = self.repr(obj)
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for key in dir(obj):
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try:
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items.append((key, self.repr(getattr(obj, key))))
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except Exception:
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pass
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title = "Details for"
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title += " " + object.__repr__(obj)[1:-1]
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return self.render_object_dump(items, title, repr)
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def dump_locals(self, d):
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items = [(key, self.repr(value)) for key, value in d.items()]
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return self.render_object_dump(items, "Local variables in frame")
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def render_object_dump(self, items, title, repr=None):
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html_items = []
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for key, value in items:
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html_items.append(
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"<tr><th>%s<td><pre class=repr>%s</pre>" % (escape(key), value)
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)
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if not html_items:
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html_items.append("<tr><td><em>Nothing</em>")
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return OBJECT_DUMP_HTML % {
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"title": escape(title),
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"repr": "<pre class=repr>%s</pre>" % repr if repr else "",
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"items": "\n".join(html_items),
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}
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