|
- import sys
- import py
-
- BuiltinAssertionError = py.builtin.builtins.AssertionError
-
- _reprcompare = None # if set, will be called by assert reinterp for comparison ops
-
- 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.
- """
- raw_lines = (explanation or '').split('\n')
- # escape newlines not followed by {, } and ~
- lines = [raw_lines[0]]
- for l in raw_lines[1:]:
- if l.startswith('{') or l.startswith('}') or l.startswith('~'):
- lines.append(l)
- else:
- lines[-1] += '\\n' + l
-
- result = lines[:1]
- stack = [0]
- stackcnt = [0]
- for line in lines[1:]:
- if line.startswith('{'):
- if stackcnt[-1]:
- s = 'and '
- else:
- s = 'where '
- stack.append(len(result))
- stackcnt[-1] += 1
- stackcnt.append(0)
- result.append(' +' + ' '*(len(stack)-1) + s + line[1:])
- elif line.startswith('}'):
- assert line.startswith('}')
- stack.pop()
- stackcnt.pop()
- result[stack[-1]] += line[1:]
- else:
- assert line.startswith('~')
- result.append(' '*len(stack) + line[1:])
- assert len(stack) == 1
- return '\n'.join(result)
-
-
- class AssertionError(BuiltinAssertionError):
- def __init__(self, *args):
- BuiltinAssertionError.__init__(self, *args)
- if args:
- try:
- self.msg = str(args[0])
- except py.builtin._sysex:
- raise
- except:
- self.msg = "<[broken __repr__] %s at %0xd>" %(
- args[0].__class__, id(args[0]))
- else:
- f = py.code.Frame(sys._getframe(1))
- try:
- source = f.code.fullsource
- if source is not None:
- try:
- source = source.getstatement(f.lineno, assertion=True)
- except IndexError:
- source = None
- else:
- source = str(source.deindent()).strip()
- except py.error.ENOENT:
- source = None
- # this can also occur during reinterpretation, when the
- # co_filename is set to "<run>".
- if source:
- self.msg = reinterpret(source, f, should_fail=True)
- else:
- self.msg = "<could not determine information>"
- if not self.args:
- self.args = (self.msg,)
-
- if sys.version_info > (3, 0):
- AssertionError.__module__ = "builtins"
- reinterpret_old = "old reinterpretation not available for py3"
- else:
- from py._code._assertionold import interpret as reinterpret_old
- from py._code._assertionnew import interpret as reinterpret
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