bazarr/libs/werkzeug/debug/repr.py

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2019-12-02 21:46:54 +00:00
# -*- coding: utf-8 -*-
"""
werkzeug.debug.repr
~~~~~~~~~~~~~~~~~~~
This module implements object representations for debugging purposes.
Unlike the default repr these reprs expose a lot more information and
produce HTML instead of ASCII.
Together with the CSS and JavaScript files of the debugger this gives
a colorful and more compact output.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
import codecs
import re
import sys
from collections import deque
from traceback import format_exception_only
from .._compat import integer_types
from .._compat import iteritems
from .._compat import PY2
from .._compat import string_types
from .._compat import text_type
from ..utils import escape
missing = object()
_paragraph_re = re.compile(r"(?:\r\n|\r|\n){2,}")
RegexType = type(_paragraph_re)
HELP_HTML = """\
<div class=box>
<h3>%(title)s</h3>
<pre class=help>%(text)s</pre>
</div>\
"""
OBJECT_DUMP_HTML = """\
<div class=box>
<h3>%(title)s</h3>
%(repr)s
<table>%(items)s</table>
</div>\
"""
def debug_repr(obj):
"""Creates a debug repr of an object as HTML unicode string."""
return DebugReprGenerator().repr(obj)
def dump(obj=missing):
"""Print the object details to stdout._write (for the interactive
console of the web debugger.
"""
gen = DebugReprGenerator()
if obj is missing:
rv = gen.dump_locals(sys._getframe(1).f_locals)
else:
rv = gen.dump_object(obj)
sys.stdout._write(rv)
class _Helper(object):
"""Displays an HTML version of the normal help, for the interactive
debugger only because it requires a patched sys.stdout.
"""
def __repr__(self):
return "Type help(object) for help about object."
def __call__(self, topic=None):
if topic is None:
sys.stdout._write("<span class=help>%s</span>" % repr(self))
return
import pydoc
pydoc.help(topic)
rv = sys.stdout.reset()
if isinstance(rv, bytes):
rv = rv.decode("utf-8", "ignore")
paragraphs = _paragraph_re.split(rv)
if len(paragraphs) > 1:
title = paragraphs[0]
text = "\n\n".join(paragraphs[1:])
else: # pragma: no cover
title = "Help"
text = paragraphs[0]
sys.stdout._write(HELP_HTML % {"title": title, "text": text})
helper = _Helper()
def _add_subclass_info(inner, obj, base):
if isinstance(base, tuple):
for base in base:
if type(obj) is base:
return inner
elif type(obj) is base:
return inner
module = ""
if obj.__class__.__module__ not in ("__builtin__", "exceptions"):
module = '<span class="module">%s.</span>' % obj.__class__.__module__
return "%s%s(%s)" % (module, obj.__class__.__name__, inner)
class DebugReprGenerator(object):
def __init__(self):
self._stack = []
def _sequence_repr_maker(left, right, base=object(), limit=8): # noqa: B008, B902
def proxy(self, obj, recursive):
if recursive:
return _add_subclass_info(left + "..." + right, obj, base)
buf = [left]
have_extended_section = False
for idx, item in enumerate(obj):
if idx:
buf.append(", ")
if idx == limit:
buf.append('<span class="extended">')
have_extended_section = True
buf.append(self.repr(item))
if have_extended_section:
buf.append("</span>")
buf.append(right)
return _add_subclass_info(u"".join(buf), obj, base)
return proxy
list_repr = _sequence_repr_maker("[", "]", list)
tuple_repr = _sequence_repr_maker("(", ")", tuple)
set_repr = _sequence_repr_maker("set([", "])", set)
frozenset_repr = _sequence_repr_maker("frozenset([", "])", frozenset)
deque_repr = _sequence_repr_maker(
'<span class="module">collections.' "</span>deque([", "])", deque
)
del _sequence_repr_maker
def regex_repr(self, obj):
pattern = repr(obj.pattern)
if PY2:
pattern = pattern.decode("string-escape", "ignore")
else:
pattern = codecs.decode(pattern, "unicode-escape", "ignore")
if pattern[:1] == "u":
pattern = "ur" + pattern[1:]
else:
pattern = "r" + pattern
return u're.compile(<span class="string regex">%s</span>)' % pattern
def string_repr(self, obj, limit=70):
buf = ['<span class="string">']
r = repr(obj)
# shorten the repr when the hidden part would be at least 3 chars
if len(r) - limit > 2:
buf.extend(
(
escape(r[:limit]),
'<span class="extended">',
escape(r[limit:]),
"</span>",
)
)
else:
buf.append(escape(r))
buf.append("</span>")
out = u"".join(buf)
# if the repr looks like a standard string, add subclass info if needed
if r[0] in "'\"" or (r[0] in "ub" and r[1] in "'\""):
return _add_subclass_info(out, obj, (bytes, text_type))
# otherwise, assume the repr distinguishes the subclass already
return out
def dict_repr(self, d, recursive, limit=5):
if recursive:
return _add_subclass_info(u"{...}", d, dict)
buf = ["{"]
have_extended_section = False
for idx, (key, value) in enumerate(iteritems(d)):
if idx:
buf.append(", ")
if idx == limit - 1:
buf.append('<span class="extended">')
have_extended_section = True
buf.append(
'<span class="pair"><span class="key">%s</span>: '
'<span class="value">%s</span></span>'
% (self.repr(key), self.repr(value))
)
if have_extended_section:
buf.append("</span>")
buf.append("}")
return _add_subclass_info(u"".join(buf), d, dict)
def object_repr(self, obj):
r = repr(obj)
if PY2:
r = r.decode("utf-8", "replace")
return u'<span class="object">%s</span>' % escape(r)
def dispatch_repr(self, obj, recursive):
if obj is helper:
return u'<span class="help">%r</span>' % helper
if isinstance(obj, (integer_types, float, complex)):
return u'<span class="number">%r</span>' % obj
if isinstance(obj, string_types) or isinstance(obj, bytes):
return self.string_repr(obj)
if isinstance(obj, RegexType):
return self.regex_repr(obj)
if isinstance(obj, list):
return self.list_repr(obj, recursive)
if isinstance(obj, tuple):
return self.tuple_repr(obj, recursive)
if isinstance(obj, set):
return self.set_repr(obj, recursive)
if isinstance(obj, frozenset):
return self.frozenset_repr(obj, recursive)
if isinstance(obj, dict):
return self.dict_repr(obj, recursive)
if deque is not None and isinstance(obj, deque):
return self.deque_repr(obj, recursive)
return self.object_repr(obj)
def fallback_repr(self):
try:
info = "".join(format_exception_only(*sys.exc_info()[:2]))
except Exception: # pragma: no cover
info = "?"
if PY2:
info = info.decode("utf-8", "ignore")
return u'<span class="brokenrepr">&lt;broken repr (%s)&gt;' u"</span>" % escape(
info.strip()
)
def repr(self, obj):
recursive = False
for item in self._stack:
if item is obj:
recursive = True
break
self._stack.append(obj)
try:
try:
return self.dispatch_repr(obj, recursive)
except Exception:
return self.fallback_repr()
finally:
self._stack.pop()
def dump_object(self, obj):
repr = items = None
if isinstance(obj, dict):
title = "Contents of"
items = []
for key, value in iteritems(obj):
if not isinstance(key, string_types):
items = None
break
items.append((key, self.repr(value)))
if items is None:
items = []
repr = self.repr(obj)
for key in dir(obj):
try:
items.append((key, self.repr(getattr(obj, key))))
except Exception:
pass
title = "Details for"
title += " " + object.__repr__(obj)[1:-1]
return self.render_object_dump(items, title, repr)
def dump_locals(self, d):
items = [(key, self.repr(value)) for key, value in d.items()]
return self.render_object_dump(items, "Local variables in frame")
def render_object_dump(self, items, title, repr=None):
html_items = []
for key, value in items:
html_items.append(
"<tr><th>%s<td><pre class=repr>%s</pre>" % (escape(key), value)
)
if not html_items:
html_items.append("<tr><td><em>Nothing</em>")
return OBJECT_DUMP_HTML % {
"title": escape(title),
"repr": "<pre class=repr>%s</pre>" % repr if repr else "",
"items": "\n".join(html_items),
}