def testYieldExpr(self):
visitor = block.FunctionBlockVisitor(_ParseStmt('def foo(): pass'))
visitor.visit(_ParseStmt('foo = (yield)'))
self.assertTrue(visitor.is_generator)
self.assertEqual(sorted(visitor.vars.keys()), ['foo'])
self.assertRegexpMatches(visitor.vars['foo'].init_expr,
r'UnboundLocal')
def visit_function_inline(self, node):
"""Returns an GeneratedExpr for a function with the given body."""
# First pass collects the names of locals used in this function. Do this in
# a separate pass so that we know whether to resolve a name as a local or a
# global during the second pass.
func_visitor = block.FunctionBlockVisitor(node)
for child in node.body:
func_visitor.visit(child)
func_block = block.FunctionBlock(self.block, node.name, func_visitor.vars,
func_visitor.is_generator)
visitor = StatementVisitor(func_block, self.future_node)
# Indent so that the function body is aligned with the goto labels.
with visitor.writer.indent_block():
visitor._visit_each(node.body) # pylint: disable=protected-access
result = self.block.alloc_temp()
with self.block.alloc_temp('[]πg.Param') as func_args:
args = node.args
argc = len(args.args)
self.writer.write('{} = make([]πg.Param, {})'.format(
func_args.expr, argc))
# The list of defaults only contains args for which a default value is
# specified so pad it with None to make it the same length as args.
defaults = [None] * (argc - len(args.defaults)) + args.defaults
for i, (a, d) in enumerate(zip(args.args, defaults)):
with self.visit_expr(d) if d else expr.nil_expr as default:
tmpl = '$args[$i] = πg.Param{Name: $name, Def: $default}'
self.writer.write_tmpl(tmpl, args=func_args.expr, i=i,
name=util.go_str(a.arg), default=default.expr)
flags = []
if args.vararg:
flags.append('πg.CodeFlagVarArg')
if args.kwarg:
flags.append('πg.CodeFlagKWArg')
# The function object gets written to a temporary writer because we need
# it as an expression that we subsequently bind to some variable.
self.writer.write_tmpl(
'$result = πg.NewFunction(πg.NewCode($name, $filename, $args, '
'$flags, func(πF *πg.Frame, πArgs []*πg.Object) '
'(*πg.Object, *πg.BaseException) {',
result=result.name, name=util.go_str(node.name),
filename=util.go_str(self.block.root.filename), args=func_args.expr,
flags=' | '.join(flags) if flags else 0)
with self.writer.indent_block():
for var in func_block.vars.values():
if var.type != block.Var.TYPE_GLOBAL:
fmt = 'var {0} *πg.Object = {1}; _ = {0}'
self.writer.write(fmt.format(
util.adjust_local_name(var.name), var.init_expr))
self.writer.write_temp_decls(func_block)
if func_block.is_generator:
self.writer.write('return πg.NewGenerator(πF, func(πSent *πg.Object) '
'(*πg.Object, *πg.BaseException) {')
with self.writer.indent_block():
self.writer.write_block(func_block, visitor.writer.getvalue())
self.writer.write('}).ToObject(), nil')
else:
self.writer.write_block(func_block, visitor.writer.getvalue())
self.writer.write('}), πF.Globals()).ToObject()')
return result
def testArgs(self):
func = _ParseStmt('def foo(bar, baz, *args, **kwargs): pass')
visitor = block.FunctionBlockVisitor(func)
self.assertIn('bar', visitor.vars)
self.assertIn('baz', visitor.vars)
self.assertIn('args', visitor.vars)
self.assertIn('kwargs', visitor.vars)
self.assertRegexpMatches(visitor.vars['bar'].init_expr, r'Args\[0\]')
self.assertRegexpMatches(visitor.vars['baz'].init_expr, r'Args\[1\]')
self.assertRegexpMatches(visitor.vars['args'].init_expr, r'Args\[2\]')
self.assertRegexpMatches(visitor.vars['kwargs'].init_expr, r'Args\[3\]')
def testYield(self):
visitor = block.FunctionBlockVisitor(_ParseStmt('def foo(): pass'))
visitor.visit(_ParseStmt('yield "foo"'))
self.assertTrue(visitor.is_generator)
