diff options
Diffstat (limited to 'lib/spack/external/pytest-fallback/py/_code/_assertionnew.py')
| -rw-r--r-- | lib/spack/external/pytest-fallback/py/_code/_assertionnew.py | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/lib/spack/external/pytest-fallback/py/_code/_assertionnew.py b/lib/spack/external/pytest-fallback/py/_code/_assertionnew.py new file mode 100644 index 0000000000..afb1b31ff0 --- /dev/null +++ b/lib/spack/external/pytest-fallback/py/_code/_assertionnew.py @@ -0,0 +1,339 @@ +""" +Find intermediate evalutation results in assert statements through builtin AST. +This should replace _assertionold.py eventually. +""" + +import sys +import ast + +import py +from py._code.assertion import _format_explanation, BuiltinAssertionError + + +if sys.platform.startswith("java") and sys.version_info < (2, 5, 2): + # See http://bugs.jython.org/issue1497 + _exprs = ("BoolOp", "BinOp", "UnaryOp", "Lambda", "IfExp", "Dict", + "ListComp", "GeneratorExp", "Yield", "Compare", "Call", + "Repr", "Num", "Str", "Attribute", "Subscript", "Name", + "List", "Tuple") + _stmts = ("FunctionDef", "ClassDef", "Return", "Delete", "Assign", + "AugAssign", "Print", "For", "While", "If", "With", "Raise", + "TryExcept", "TryFinally", "Assert", "Import", "ImportFrom", + "Exec", "Global", "Expr", "Pass", "Break", "Continue") + _expr_nodes = set(getattr(ast, name) for name in _exprs) + _stmt_nodes = set(getattr(ast, name) for name in _stmts) + def _is_ast_expr(node): + return node.__class__ in _expr_nodes + def _is_ast_stmt(node): + return node.__class__ in _stmt_nodes +else: + def _is_ast_expr(node): + return isinstance(node, ast.expr) + def _is_ast_stmt(node): + return isinstance(node, ast.stmt) + + +class Failure(Exception): + """Error found while interpreting AST.""" + + def __init__(self, explanation=""): + self.cause = sys.exc_info() + self.explanation = explanation + + +def interpret(source, frame, should_fail=False): + mod = ast.parse(source) + visitor = DebugInterpreter(frame) + try: + visitor.visit(mod) + except Failure: + failure = sys.exc_info()[1] + return getfailure(failure) + if should_fail: + return ("(assertion failed, but when it was re-run for " + "printing intermediate values, it did not fail. Suggestions: " + "compute assert expression before the assert or use --no-assert)") + +def run(offending_line, frame=None): + if frame is None: + frame = py.code.Frame(sys._getframe(1)) + return interpret(offending_line, frame) + +def getfailure(failure): + explanation = _format_explanation(failure.explanation) + value = failure.cause[1] + if str(value): + lines = explanation.splitlines() + if not lines: + lines.append("") + lines[0] += " << %s" % (value,) + explanation = "\n".join(lines) + text = "%s: %s" % (failure.cause[0].__name__, explanation) + if text.startswith("AssertionError: assert "): + text = text[16:] + return text + + +operator_map = { + ast.BitOr : "|", + ast.BitXor : "^", + ast.BitAnd : "&", + ast.LShift : "<<", + ast.RShift : ">>", + ast.Add : "+", + ast.Sub : "-", + ast.Mult : "*", + ast.Div : "/", + ast.FloorDiv : "//", + ast.Mod : "%", + ast.Eq : "==", + ast.NotEq : "!=", + ast.Lt : "<", + ast.LtE : "<=", + ast.Gt : ">", + ast.GtE : ">=", + ast.Pow : "**", + ast.Is : "is", + ast.IsNot : "is not", + ast.In : "in", + ast.NotIn : "not in" +} + +unary_map = { + ast.Not : "not %s", + ast.Invert : "~%s", + ast.USub : "-%s", + ast.UAdd : "+%s" +} + + +class DebugInterpreter(ast.NodeVisitor): + """Interpret AST nodes to gleam useful debugging information. """ + + def __init__(self, frame): + self.frame = frame + + def generic_visit(self, node): + # Fallback when we don't have a special implementation. + if _is_ast_expr(node): + mod = ast.Expression(node) + co = self._compile(mod) + try: + result = self.frame.eval(co) + except Exception: + raise Failure() + explanation = self.frame.repr(result) + return explanation, result + elif _is_ast_stmt(node): + mod = ast.Module([node]) + co = self._compile(mod, "exec") + try: + self.frame.exec_(co) + except Exception: + raise Failure() + return None, None + else: + raise AssertionError("can't handle %s" %(node,)) + + def _compile(self, source, mode="eval"): + return compile(source, "<assertion interpretation>", mode) + + def visit_Expr(self, expr): + return self.visit(expr.value) + + def visit_Module(self, mod): + for stmt in mod.body: + self.visit(stmt) + + def visit_Name(self, name): + explanation, result = self.generic_visit(name) + # See if the name is local. + source = "%r in locals() is not globals()" % (name.id,) + co = self._compile(source) + try: + local = self.frame.eval(co) + except Exception: + # have to assume it isn't + local = False + if not local: + return name.id, result + return explanation, result + + def visit_Compare(self, comp): + left = comp.left + left_explanation, left_result = self.visit(left) + for op, next_op in zip(comp.ops, comp.comparators): + next_explanation, next_result = self.visit(next_op) + op_symbol = operator_map[op.__class__] + explanation = "%s %s %s" % (left_explanation, op_symbol, + next_explanation) + source = "__exprinfo_left %s __exprinfo_right" % (op_symbol,) + co = self._compile(source) + try: + result = self.frame.eval(co, __exprinfo_left=left_result, + __exprinfo_right=next_result) + except Exception: + raise Failure(explanation) + try: + if not result: + break + except KeyboardInterrupt: + raise + except: + break + left_explanation, left_result = next_explanation, next_result + + rcomp = py.code._reprcompare + if rcomp: + res = rcomp(op_symbol, left_result, next_result) + if res: + explanation = res + return explanation, result + + def visit_BoolOp(self, boolop): + is_or = isinstance(boolop.op, ast.Or) + explanations = [] + for operand in boolop.values: + explanation, result = self.visit(operand) + explanations.append(explanation) + if result == is_or: + break + name = is_or and " or " or " and " + explanation = "(" + name.join(explanations) + ")" + return explanation, result + + def visit_UnaryOp(self, unary): + pattern = unary_map[unary.op.__class__] + operand_explanation, operand_result = self.visit(unary.operand) + explanation = pattern % (operand_explanation,) + co = self._compile(pattern % ("__exprinfo_expr",)) + try: + result = self.frame.eval(co, __exprinfo_expr=operand_result) + except Exception: + raise Failure(explanation) + return explanation, result + + def visit_BinOp(self, binop): + left_explanation, left_result = self.visit(binop.left) + right_explanation, right_result = self.visit(binop.right) + symbol = operator_map[binop.op.__class__] + explanation = "(%s %s %s)" % (left_explanation, symbol, + right_explanation) + source = "__exprinfo_left %s __exprinfo_right" % (symbol,) + co = self._compile(source) + try: + result = self.frame.eval(co, __exprinfo_left=left_result, + __exprinfo_right=right_result) + except Exception: + raise Failure(explanation) + return explanation, result + + def visit_Call(self, call): + func_explanation, func = self.visit(call.func) + arg_explanations = [] + ns = {"__exprinfo_func" : func} + arguments = [] + for arg in call.args: + arg_explanation, arg_result = self.visit(arg) + arg_name = "__exprinfo_%s" % (len(ns),) + ns[arg_name] = arg_result + arguments.append(arg_name) + arg_explanations.append(arg_explanation) + for keyword in call.keywords: + arg_explanation, arg_result = self.visit(keyword.value) + arg_name = "__exprinfo_%s" % (len(ns),) + ns[arg_name] = arg_result + keyword_source = "%s=%%s" % (keyword.arg) + arguments.append(keyword_source % (arg_name,)) + arg_explanations.append(keyword_source % (arg_explanation,)) + if call.starargs: + arg_explanation, arg_result = self.visit(call.starargs) + arg_name = "__exprinfo_star" + ns[arg_name] = arg_result + arguments.append("*%s" % (arg_name,)) + arg_explanations.append("*%s" % (arg_explanation,)) + if call.kwargs: + arg_explanation, arg_result = self.visit(call.kwargs) + arg_name = "__exprinfo_kwds" + ns[arg_name] = arg_result + arguments.append("**%s" % (arg_name,)) + arg_explanations.append("**%s" % (arg_explanation,)) + args_explained = ", ".join(arg_explanations) + explanation = "%s(%s)" % (func_explanation, args_explained) + args = ", ".join(arguments) + source = "__exprinfo_func(%s)" % (args,) + co = self._compile(source) + try: + result = self.frame.eval(co, **ns) + except Exception: + raise Failure(explanation) + pattern = "%s\n{%s = %s\n}" + rep = self.frame.repr(result) + explanation = pattern % (rep, rep, explanation) + return explanation, result + + def _is_builtin_name(self, name): + pattern = "%r not in globals() and %r not in locals()" + source = pattern % (name.id, name.id) + co = self._compile(source) + try: + return self.frame.eval(co) + except Exception: + return False + + def visit_Attribute(self, attr): + if not isinstance(attr.ctx, ast.Load): + return self.generic_visit(attr) + source_explanation, source_result = self.visit(attr.value) + explanation = "%s.%s" % (source_explanation, attr.attr) + source = "__exprinfo_expr.%s" % (attr.attr,) + co = self._compile(source) + try: + result = self.frame.eval(co, __exprinfo_expr=source_result) + except Exception: + raise Failure(explanation) + explanation = "%s\n{%s = %s.%s\n}" % (self.frame.repr(result), + self.frame.repr(result), + source_explanation, attr.attr) + # Check if the attr is from an instance. + source = "%r in getattr(__exprinfo_expr, '__dict__', {})" + source = source % (attr.attr,) + co = self._compile(source) + try: + from_instance = self.frame.eval(co, __exprinfo_expr=source_result) + except Exception: + from_instance = True + if from_instance: + rep = self.frame.repr(result) + pattern = "%s\n{%s = %s\n}" + explanation = pattern % (rep, rep, explanation) + return explanation, result + + def visit_Assert(self, assrt): + test_explanation, test_result = self.visit(assrt.test) + if test_explanation.startswith("False\n{False =") and \ + test_explanation.endswith("\n"): + test_explanation = test_explanation[15:-2] + explanation = "assert %s" % (test_explanation,) + if not test_result: + try: + raise BuiltinAssertionError + except Exception: + raise Failure(explanation) + return explanation, test_result + + def visit_Assign(self, assign): + value_explanation, value_result = self.visit(assign.value) + explanation = "... = %s" % (value_explanation,) + name = ast.Name("__exprinfo_expr", ast.Load(), + lineno=assign.value.lineno, + col_offset=assign.value.col_offset) + new_assign = ast.Assign(assign.targets, name, lineno=assign.lineno, + col_offset=assign.col_offset) + mod = ast.Module([new_assign]) + co = self._compile(mod, "exec") + try: + self.frame.exec_(co, __exprinfo_expr=value_result) + except Exception: + raise Failure(explanation) + return explanation, value_result |