def test_compiler_yield_return():
"""
Check that the compiler correctly generates return statements for
a generator function. In Python versions prior to 3.3, the return
statement in a generator can't take a value, so the final expression
should not generate a return statement. From 3.3 onwards a return
value should be generated.
"""
e = make_expression(Symbol("fn"), List(),
Expression([Symbol("yield"),
Integer(2)]),
Expression([Symbol("+"),
Integer(1),
Integer(1)]))
ret = compiler.HyASTCompiler(types.ModuleType('test')).compile_atom(e)
assert len(ret.stmts) == 1
stmt, = ret.stmts
assert isinstance(stmt, ast.FunctionDef)
body = stmt.body
assert len(body) == 2
assert isinstance(body[0], ast.Expr)
assert isinstance(body[0].value, ast.Yield)
assert isinstance(body[1], ast.Return)
assert isinstance(body[1].value, ast.BinOp)
def test_compiler_yield_return():
"""
Check that the compiler correctly generates return statements for
a generator function. In Python versions prior to 3.3, the return
statement in a generator can't take a value, so the final expression
should not generate a return statement. From 3.3 onwards a return
value should be generated.
"""
e = make_expression(HySymbol("fn"),
HyList(),
HyExpression([HySymbol("yield"),
HyInteger(2)]),
HyExpression([HySymbol("+"),
HyInteger(1),
HyInteger(1)]))
ret = compiler.HyASTCompiler('test').compile_function_def(e)
assert len(ret.stmts) == 1
stmt, = ret.stmts
assert isinstance(stmt, ast.FunctionDef)
body = stmt.body
assert len(body) == 2
assert isinstance(body[0], ast.Expr)
assert isinstance(body[0].value, ast.Yield)
if PY3:
# From 3.3+, the final statement becomes a return value
assert isinstance(body[1], ast.Return)
assert isinstance(body[1].value, ast.BinOp)
else:
# In earlier versions, the expression is not returned
assert isinstance(body[1], ast.Expr)
assert isinstance(body[1].value, ast.BinOp)
def test_compiler_bare_names():
"""
Check that the compiler doesn't drop bare names from code branches
"""
e = make_expression(Symbol("do"), Symbol("a"), Symbol("b"), Symbol("c"))
ret = compiler.HyASTCompiler(types.ModuleType('test')).compile(e)
# We expect two statements and a final expr.
assert len(ret.stmts) == 2
for stmt, symbol in zip(ret.stmts, "ab"):
assert isinstance(stmt, ast.Expr)
assert isinstance(stmt.value, ast.Name)
assert stmt.value.id == symbol
assert isinstance(ret.expr, ast.Name)
assert ret.expr.id == "c"
def setUp(self):
self.c = compiler.HyASTCompiler('test')
