305 lines
10 KiB
Python
305 lines
10 KiB
Python
"""Utilities for assertion debugging"""
|
|
from __future__ import absolute_import, division, print_function
|
|
import pprint
|
|
|
|
import _pytest._code
|
|
import py
|
|
import six
|
|
from collections import Sequence
|
|
|
|
u = six.text_type
|
|
|
|
# The _reprcompare attribute on the util module is used by the new assertion
|
|
# interpretation code and assertion rewriter to detect this plugin was
|
|
# loaded and in turn call the hooks defined here as part of the
|
|
# DebugInterpreter.
|
|
_reprcompare = None
|
|
|
|
|
|
# the re-encoding is needed for python2 repr
|
|
# with non-ascii characters (see issue 877 and 1379)
|
|
def ecu(s):
|
|
try:
|
|
return u(s, 'utf-8', 'replace')
|
|
except TypeError:
|
|
return s
|
|
|
|
|
|
def format_explanation(explanation):
|
|
"""This formats an explanation
|
|
|
|
Normally all embedded newlines are escaped, however there are
|
|
three exceptions: \n{, \n} and \n~. The first two are intended
|
|
cover nested explanations, see function and attribute explanations
|
|
for examples (.visit_Call(), visit_Attribute()). The last one is
|
|
for when one explanation needs to span multiple lines, e.g. when
|
|
displaying diffs.
|
|
"""
|
|
explanation = ecu(explanation)
|
|
lines = _split_explanation(explanation)
|
|
result = _format_lines(lines)
|
|
return u('\n').join(result)
|
|
|
|
|
|
def _split_explanation(explanation):
|
|
"""Return a list of individual lines in the explanation
|
|
|
|
This will return a list of lines split on '\n{', '\n}' and '\n~'.
|
|
Any other newlines will be escaped and appear in the line as the
|
|
literal '\n' characters.
|
|
"""
|
|
raw_lines = (explanation or u('')).split('\n')
|
|
lines = [raw_lines[0]]
|
|
for values in raw_lines[1:]:
|
|
if values and values[0] in ['{', '}', '~', '>']:
|
|
lines.append(values)
|
|
else:
|
|
lines[-1] += '\\n' + values
|
|
return lines
|
|
|
|
|
|
def _format_lines(lines):
|
|
"""Format the individual lines
|
|
|
|
This will replace the '{', '}' and '~' characters of our mini
|
|
formatting language with the proper 'where ...', 'and ...' and ' +
|
|
...' text, taking care of indentation along the way.
|
|
|
|
Return a list of formatted lines.
|
|
"""
|
|
result = lines[:1]
|
|
stack = [0]
|
|
stackcnt = [0]
|
|
for line in lines[1:]:
|
|
if line.startswith('{'):
|
|
if stackcnt[-1]:
|
|
s = u('and ')
|
|
else:
|
|
s = u('where ')
|
|
stack.append(len(result))
|
|
stackcnt[-1] += 1
|
|
stackcnt.append(0)
|
|
result.append(u(' +') + u(' ') * (len(stack) - 1) + s + line[1:])
|
|
elif line.startswith('}'):
|
|
stack.pop()
|
|
stackcnt.pop()
|
|
result[stack[-1]] += line[1:]
|
|
else:
|
|
assert line[0] in ['~', '>']
|
|
stack[-1] += 1
|
|
indent = len(stack) if line.startswith('~') else len(stack) - 1
|
|
result.append(u(' ') * indent + line[1:])
|
|
assert len(stack) == 1
|
|
return result
|
|
|
|
|
|
# Provide basestring in python3
|
|
try:
|
|
basestring = basestring
|
|
except NameError:
|
|
basestring = str
|
|
|
|
|
|
def assertrepr_compare(config, op, left, right):
|
|
"""Return specialised explanations for some operators/operands"""
|
|
width = 80 - 15 - len(op) - 2 # 15 chars indentation, 1 space around op
|
|
left_repr = py.io.saferepr(left, maxsize=int(width // 2))
|
|
right_repr = py.io.saferepr(right, maxsize=width - len(left_repr))
|
|
|
|
summary = u('%s %s %s') % (ecu(left_repr), op, ecu(right_repr))
|
|
|
|
def issequence(x):
|
|
return isinstance(x, Sequence) and not isinstance(x, basestring)
|
|
|
|
def istext(x):
|
|
return isinstance(x, basestring)
|
|
|
|
def isdict(x):
|
|
return isinstance(x, dict)
|
|
|
|
def isset(x):
|
|
return isinstance(x, (set, frozenset))
|
|
|
|
def isiterable(obj):
|
|
try:
|
|
iter(obj)
|
|
return not istext(obj)
|
|
except TypeError:
|
|
return False
|
|
|
|
verbose = config.getoption('verbose')
|
|
explanation = None
|
|
try:
|
|
if op == '==':
|
|
if istext(left) and istext(right):
|
|
explanation = _diff_text(left, right, verbose)
|
|
else:
|
|
if issequence(left) and issequence(right):
|
|
explanation = _compare_eq_sequence(left, right, verbose)
|
|
elif isset(left) and isset(right):
|
|
explanation = _compare_eq_set(left, right, verbose)
|
|
elif isdict(left) and isdict(right):
|
|
explanation = _compare_eq_dict(left, right, verbose)
|
|
if isiterable(left) and isiterable(right):
|
|
expl = _compare_eq_iterable(left, right, verbose)
|
|
if explanation is not None:
|
|
explanation.extend(expl)
|
|
else:
|
|
explanation = expl
|
|
elif op == 'not in':
|
|
if istext(left) and istext(right):
|
|
explanation = _notin_text(left, right, verbose)
|
|
except Exception:
|
|
explanation = [
|
|
u('(pytest_assertion plugin: representation of details failed. '
|
|
'Probably an object has a faulty __repr__.)'),
|
|
u(_pytest._code.ExceptionInfo())]
|
|
|
|
if not explanation:
|
|
return None
|
|
|
|
return [summary] + explanation
|
|
|
|
|
|
def _diff_text(left, right, verbose=False):
|
|
"""Return the explanation for the diff between text or bytes
|
|
|
|
Unless --verbose is used this will skip leading and trailing
|
|
characters which are identical to keep the diff minimal.
|
|
|
|
If the input are bytes they will be safely converted to text.
|
|
"""
|
|
from difflib import ndiff
|
|
explanation = []
|
|
if isinstance(left, six.binary_type):
|
|
left = u(repr(left)[1:-1]).replace(r'\n', '\n')
|
|
if isinstance(right, six.binary_type):
|
|
right = u(repr(right)[1:-1]).replace(r'\n', '\n')
|
|
if not verbose:
|
|
i = 0 # just in case left or right has zero length
|
|
for i in range(min(len(left), len(right))):
|
|
if left[i] != right[i]:
|
|
break
|
|
if i > 42:
|
|
i -= 10 # Provide some context
|
|
explanation = [u('Skipping %s identical leading '
|
|
'characters in diff, use -v to show') % i]
|
|
left = left[i:]
|
|
right = right[i:]
|
|
if len(left) == len(right):
|
|
for i in range(len(left)):
|
|
if left[-i] != right[-i]:
|
|
break
|
|
if i > 42:
|
|
i -= 10 # Provide some context
|
|
explanation += [u('Skipping %s identical trailing '
|
|
'characters in diff, use -v to show') % i]
|
|
left = left[:-i]
|
|
right = right[:-i]
|
|
keepends = True
|
|
explanation += [line.strip('\n')
|
|
for line in ndiff(left.splitlines(keepends),
|
|
right.splitlines(keepends))]
|
|
return explanation
|
|
|
|
|
|
def _compare_eq_iterable(left, right, verbose=False):
|
|
if not verbose:
|
|
return [u('Use -v to get the full diff')]
|
|
# dynamic import to speedup pytest
|
|
import difflib
|
|
|
|
try:
|
|
left_formatting = pprint.pformat(left).splitlines()
|
|
right_formatting = pprint.pformat(right).splitlines()
|
|
explanation = [u('Full diff:')]
|
|
except Exception:
|
|
# hack: PrettyPrinter.pformat() in python 2 fails when formatting items that can't be sorted(), ie, calling
|
|
# sorted() on a list would raise. See issue #718.
|
|
# As a workaround, the full diff is generated by using the repr() string of each item of each container.
|
|
left_formatting = sorted(repr(x) for x in left)
|
|
right_formatting = sorted(repr(x) for x in right)
|
|
explanation = [u('Full diff (fallback to calling repr on each item):')]
|
|
explanation.extend(line.strip() for line in difflib.ndiff(left_formatting, right_formatting))
|
|
return explanation
|
|
|
|
|
|
def _compare_eq_sequence(left, right, verbose=False):
|
|
explanation = []
|
|
for i in range(min(len(left), len(right))):
|
|
if left[i] != right[i]:
|
|
explanation += [u('At index %s diff: %r != %r')
|
|
% (i, left[i], right[i])]
|
|
break
|
|
if len(left) > len(right):
|
|
explanation += [u('Left contains more items, first extra item: %s')
|
|
% py.io.saferepr(left[len(right)],)]
|
|
elif len(left) < len(right):
|
|
explanation += [
|
|
u('Right contains more items, first extra item: %s') %
|
|
py.io.saferepr(right[len(left)],)]
|
|
return explanation
|
|
|
|
|
|
def _compare_eq_set(left, right, verbose=False):
|
|
explanation = []
|
|
diff_left = left - right
|
|
diff_right = right - left
|
|
if diff_left:
|
|
explanation.append(u('Extra items in the left set:'))
|
|
for item in diff_left:
|
|
explanation.append(py.io.saferepr(item))
|
|
if diff_right:
|
|
explanation.append(u('Extra items in the right set:'))
|
|
for item in diff_right:
|
|
explanation.append(py.io.saferepr(item))
|
|
return explanation
|
|
|
|
|
|
def _compare_eq_dict(left, right, verbose=False):
|
|
explanation = []
|
|
common = set(left).intersection(set(right))
|
|
same = dict((k, left[k]) for k in common if left[k] == right[k])
|
|
if same and verbose < 2:
|
|
explanation += [u('Omitting %s identical items, use -vv to show') %
|
|
len(same)]
|
|
elif same:
|
|
explanation += [u('Common items:')]
|
|
explanation += pprint.pformat(same).splitlines()
|
|
diff = set(k for k in common if left[k] != right[k])
|
|
if diff:
|
|
explanation += [u('Differing items:')]
|
|
for k in diff:
|
|
explanation += [py.io.saferepr({k: left[k]}) + ' != ' +
|
|
py.io.saferepr({k: right[k]})]
|
|
extra_left = set(left) - set(right)
|
|
if extra_left:
|
|
explanation.append(u('Left contains more items:'))
|
|
explanation.extend(pprint.pformat(
|
|
dict((k, left[k]) for k in extra_left)).splitlines())
|
|
extra_right = set(right) - set(left)
|
|
if extra_right:
|
|
explanation.append(u('Right contains more items:'))
|
|
explanation.extend(pprint.pformat(
|
|
dict((k, right[k]) for k in extra_right)).splitlines())
|
|
return explanation
|
|
|
|
|
|
def _notin_text(term, text, verbose=False):
|
|
index = text.find(term)
|
|
head = text[:index]
|
|
tail = text[index + len(term):]
|
|
correct_text = head + tail
|
|
diff = _diff_text(correct_text, text, verbose)
|
|
newdiff = [u('%s is contained here:') % py.io.saferepr(term, maxsize=42)]
|
|
for line in diff:
|
|
if line.startswith(u('Skipping')):
|
|
continue
|
|
if line.startswith(u('- ')):
|
|
continue
|
|
if line.startswith(u('+ ')):
|
|
newdiff.append(u(' ') + line[2:])
|
|
else:
|
|
newdiff.append(line)
|
|
return newdiff
|