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|
import string
import py
from pypy.interpreter.astcompiler import ast, astbuilder, symtable, consts
from pypy.interpreter.pyparser import pyparse
from pypy.interpreter.pyparser.error import SyntaxError
class TestSymbolTable:
def setup_class(cls):
cls.parser = pyparse.PythonParser(cls.space)
def mod_scope(self, source, mode="exec"):
info = pyparse.CompileInfo("<test>", mode,
consts.CO_FUTURE_WITH_STATEMENT)
tree = self.parser.parse_source(source, info)
module = astbuilder.ast_from_node(self.space, tree, info)
builder = symtable.SymtableBuilder(self.space, module, info)
scope = builder.find_scope(module)
assert isinstance(scope, symtable.ModuleScope)
return scope
def func_scope(self, func_code):
mod_scope = self.mod_scope(func_code)
assert len(mod_scope.children) == 1
func_name = mod_scope.lookup("f")
assert func_name == symtable.SCOPE_LOCAL
func_scope = mod_scope.children[0]
assert isinstance(func_scope, symtable.FunctionScope)
return func_scope
def class_scope(self, class_code):
mod_scope = self.mod_scope(class_code)
assert len(mod_scope.children) == 1
class_name = mod_scope.lookup("x")
assert class_name == symtable.SCOPE_LOCAL
class_scope = mod_scope.children[0]
assert isinstance(class_scope, symtable.ClassScope)
return class_scope
def gen_scope(self, gen_code):
mod_scope = self.mod_scope(gen_code)
assert len(mod_scope.children) == 1
gen_scope = mod_scope.children[0]
assert isinstance(gen_scope, symtable.FunctionScope)
assert not gen_scope.children
assert gen_scope.name == "<genexpr>"
return mod_scope, gen_scope
def check_unknown(self, scp, *names):
for name in names:
assert scp.lookup(name) == symtable.SCOPE_UNKNOWN
def test_toplevel(self):
scp = self.mod_scope("x = 4")
assert scp.lookup("x") == symtable.SCOPE_LOCAL
assert not scp.optimized
scp = self.mod_scope("x = 4", "single")
assert not scp.optimized
assert scp.lookup("x") == symtable.SCOPE_LOCAL
scp = self.mod_scope("x*4*6", "eval")
assert not scp.optimized
assert scp.lookup("x") == symtable.SCOPE_GLOBAL_IMPLICIT
def test_duplicate_argument(self):
input = "def f(x, x): pass"
exc = py.test.raises(SyntaxError, self.mod_scope, input).value
assert exc.msg == "duplicate argument 'x' in function definition"
def test_function_defaults(self):
scp = self.mod_scope("y = w = 4\ndef f(x=y, *, z=w): return x")
self.check_unknown(scp, "x")
self.check_unknown(scp, "z")
assert scp.lookup("y") == symtable.SCOPE_LOCAL
assert scp.lookup("w") == symtable.SCOPE_LOCAL
scp = scp.children[0]
assert scp.lookup("x") == symtable.SCOPE_LOCAL
assert scp.lookup("z") == symtable.SCOPE_LOCAL
self.check_unknown(scp, "y")
self.check_unknown(scp, "w")
def test_function_annotations(self):
scp = self.mod_scope("def f(x : X) -> Y: pass")
assert scp.lookup("X") == symtable.SCOPE_GLOBAL_IMPLICIT
assert scp.lookup("Y") == symtable.SCOPE_GLOBAL_IMPLICIT
scp = scp.children[0]
self.check_unknown(scp, "X")
self.check_unknown(scp, "Y")
def check_comprehension(self, template):
def brack(s):
return template % (s,)
scp, gscp = self.gen_scope(brack("y[1] for y in z"))
assert scp.lookup("z") == symtable.SCOPE_GLOBAL_IMPLICIT
self.check_unknown(scp, "y", "x")
self.check_unknown(gscp, "z")
assert gscp.lookup("y") == symtable.SCOPE_LOCAL
assert gscp.lookup(".0") == symtable.SCOPE_LOCAL
scp, gscp = self.gen_scope(brack("x for x in z if x"))
self.check_unknown(scp, "x")
assert gscp.lookup("x") == symtable.SCOPE_LOCAL
scp, gscp = self.gen_scope(brack("x for y in g for f in n if f[h]"))
self.check_unknown(scp, "f")
assert gscp.lookup("f") == symtable.SCOPE_LOCAL
def test_genexp(self):
self.check_comprehension("(%s)")
def test_listcomp(self):
self.check_comprehension("[%s]")
def test_setcomp(self):
self.check_comprehension("{%s}")
def test_dictcomp(self):
scp, gscp = self.gen_scope("{x : x[3] for x in y}")
assert scp.lookup("y") == symtable.SCOPE_GLOBAL_IMPLICIT
self.check_unknown(scp, "a", "b", "x")
self.check_unknown(gscp, "y")
assert gscp.lookup("x") == symtable.SCOPE_LOCAL
assert gscp.lookup(".0") == symtable.SCOPE_LOCAL
scp, gscp = self.gen_scope("{x : x[1] for x in y if x[23]}")
self.check_unknown(scp, "x")
assert gscp.lookup("x") == symtable.SCOPE_LOCAL
def test_arguments(self):
scp = self.func_scope("def f(): pass")
assert not scp.children
self.check_unknown(scp, "x", "y")
assert not scp.symbols
assert not scp.roles
scp = self.func_scope("def f(x): pass")
assert scp.lookup("x") == symtable.SCOPE_LOCAL
scp = self.func_scope("def f(*x): pass")
assert scp.has_variable_arg
assert not scp.has_keywords_arg
assert scp.lookup("x") == symtable.SCOPE_LOCAL
scp = self.func_scope("def f(**x): pass")
assert scp.has_keywords_arg
assert not scp.has_variable_arg
assert scp.lookup("x") == symtable.SCOPE_LOCAL
def test_arguments_kwonly(self):
scp = self.func_scope("def f(a, *b, c, **d): pass")
varnames = ["a", "c", "b", "d"]
for name in varnames:
assert scp.lookup(name) == symtable.SCOPE_LOCAL
assert scp.varnames == varnames
scp = self.func_scope("def f(a, b=0, *args, k1, k2=0): pass")
assert scp.varnames == ["a", "b", "k1", "k2", "args"]
def test_function(self):
scp = self.func_scope("def f(): x = 4")
assert scp.lookup("x") == symtable.SCOPE_LOCAL
scp = self.func_scope("def f(): x")
assert scp.lookup("x") == symtable.SCOPE_GLOBAL_IMPLICIT
def test_exception_variable(self):
scp = self.mod_scope("try: pass\nexcept ValueError as e: pass")
assert scp.lookup("e") == symtable.SCOPE_LOCAL
def test_nested_scopes(self):
def nested_scope(*bodies):
names = enumerate("f" + string.ascii_letters)
lines = []
for body, (level, name) in zip(bodies, names):
lines.append(" " * level + "def %s():\n" % (name,))
if body:
if isinstance(body, str):
body = [body]
lines.extend(" " * (level + 1) + line + "\n"
for line in body)
return self.func_scope("".join(lines))
scp = nested_scope("x = 1", "return x")
assert not scp.has_free
assert scp.child_has_free
assert scp.lookup("x") == symtable.SCOPE_CELL
child = scp.children[0]
assert child.has_free
assert child.lookup("x") == symtable.SCOPE_FREE
scp = nested_scope("x = 1", None, "return x")
assert not scp.has_free
assert scp.child_has_free
assert scp.lookup("x") == symtable.SCOPE_CELL
child = scp.children[0]
assert not child.has_free
assert child.child_has_free
assert child.lookup("x") == symtable.SCOPE_FREE
child = child.children[0]
assert child.has_free
assert not child.child_has_free
assert child.lookup("x") == symtable.SCOPE_FREE
scp = nested_scope("x = 1", "x = 3", "return x")
assert scp.child_has_free
assert not scp.has_free
assert scp.lookup("x") == symtable.SCOPE_LOCAL
child = scp.children[0]
assert child.child_has_free
assert not child.has_free
assert child.lookup("x") == symtable.SCOPE_CELL
child = child.children[0]
assert child.has_free
assert child.lookup("x") == symtable.SCOPE_FREE
def test_class(self):
scp = self.mod_scope("class x(A, B): pass")
cscp = scp.children[0]
for name in ("A", "B"):
assert scp.lookup(name) == symtable.SCOPE_GLOBAL_IMPLICIT
self.check_unknown(cscp, name)
scp = self.func_scope("""def f(x):
class X:
def n():
return x
a = x
return X()""")
self.check_unknown(scp, "a")
assert scp.lookup("x") == symtable.SCOPE_CELL
assert scp.lookup("X") == symtable.SCOPE_LOCAL
cscp = scp.children[0]
assert cscp.lookup("a") == symtable.SCOPE_LOCAL
assert cscp.lookup("x") == symtable.SCOPE_FREE
fscp = cscp.children[0]
assert fscp.lookup("x") == symtable.SCOPE_FREE
self.check_unknown(fscp, "a")
scp = self.func_scope("""def f(n):
class X:
def n():
return y
def x():
return n""")
assert scp.lookup("n") == symtable.SCOPE_CELL
cscp = scp.children[0]
assert cscp.lookup("n") == symtable.SCOPE_LOCAL
assert "n" in cscp.free_vars
xscp = cscp.children[1]
assert xscp.lookup("n") == symtable.SCOPE_FREE
def test_class_kwargs(self):
scp = self.func_scope("""def f(n):
class X(meta=Z, *args, **kwargs):
pass""")
assert scp.lookup("X") == symtable.SCOPE_LOCAL
assert scp.lookup("Z") == symtable.SCOPE_GLOBAL_IMPLICIT
assert scp.lookup("args") == symtable.SCOPE_GLOBAL_IMPLICIT
assert scp.lookup("kwargs") == symtable.SCOPE_GLOBAL_IMPLICIT
def test_lambda(self):
scp = self.mod_scope("lambda x: y")
self.check_unknown(scp, "x", "y")
assert len(scp.children) == 1
lscp = scp.children[0]
assert isinstance(lscp, symtable.FunctionScope)
assert lscp.name == "<lambda>"
assert lscp.lookup("x") == symtable.SCOPE_LOCAL
assert lscp.lookup("y") == symtable.SCOPE_GLOBAL_IMPLICIT
scp = self.mod_scope("lambda x=a: b")
self.check_unknown(scp, "x", "b")
assert scp.lookup("a") == symtable.SCOPE_GLOBAL_IMPLICIT
lscp = scp.children[0]
self.check_unknown(lscp, "a")
def test_import(self):
scp = self.mod_scope("import x")
assert scp.lookup("x") == symtable.SCOPE_LOCAL
scp = self.mod_scope("import x as y")
assert scp.lookup("y") == symtable.SCOPE_LOCAL
self.check_unknown(scp, "x")
scp = self.mod_scope("import x.y")
assert scp.lookup("x") == symtable.SCOPE_LOCAL
self.check_unknown(scp, "y")
def test_from_import(self):
scp = self.mod_scope("from x import y")
self.check_unknown("x")
assert scp.lookup("y") == symtable.SCOPE_LOCAL
scp = self.mod_scope("from a import b as y")
assert scp.lookup("y") == symtable.SCOPE_LOCAL
self.check_unknown(scp, "a", "b")
scp = self.mod_scope("from x import *")
self.check_unknown("x")
def test_global(self):
scp = self.func_scope("def f():\n global x\n x = 4")
assert scp.lookup("x") == symtable.SCOPE_GLOBAL_EXPLICIT
scp = self.func_scope("""def f():
y = 3
def x():
global y
y = 4
def z():
return y""")
assert scp.lookup("y") == symtable.SCOPE_CELL
xscp, zscp = scp.children
assert xscp.lookup("y") == symtable.SCOPE_GLOBAL_EXPLICIT
assert zscp.lookup("y") == symtable.SCOPE_FREE
src = "def f(x):\n global x"
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.lineno == 2
assert exc.msg == "name 'x' is parameter and global"
def test_global_nested(self):
src = """
def f(x):
def g(x):
global x"""
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.lineno == 4
assert exc.msg == "name 'x' is parameter and global"
scp = self.func_scope("""
def f(x):
def g():
global x""")
g = scp.children[0]
assert g.name == 'g'
x = g.lookup_role('x')
assert x == symtable.SYM_GLOBAL
def test_nonlocal(self):
src = """
x = 1
def f():
nonlocal x"""
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "no binding for nonlocal 'x' found"
src = str(py.code.Source("""
def f(x):
nonlocal x
"""))
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "name 'x' is parameter and nonlocal"
#
src = str(py.code.Source("""
def f():
nonlocal x
"""))
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "no binding for nonlocal 'x' found"
#
src = "nonlocal x"
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "nonlocal declaration not allowed at module level"
assert exc.lineno == 1
src = "x = 2\nnonlocal x"
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "nonlocal declaration not allowed at module level"
assert exc.lineno == 2
def test_nonlocal_and_global(self):
"""This test differs from CPython3 behaviour. CPython points to the
first occurance of the global/local expression. PyPy will point to the
last expression which makes the problem."""
src = """
def f():
nonlocal x
global x"""
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "name 'x' is nonlocal and global"
assert exc.lineno == 4
src = """
def f():
global x
nonlocal x """
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "name 'x' is nonlocal and global"
assert exc.lineno == 4
def test_nonlocal_nested(self):
scp = self.func_scope("""
def f(x):
def g():
nonlocal x""")
g = scp.children[0]
x = g.lookup_role('x')
assert x == symtable.SYM_NONLOCAL
scp = self.func_scope("""
def f():
def g():
nonlocal x
x = 1""")
g = scp.children[0]
x = g.lookup_role('x')
assert x == symtable.SYM_NONLOCAL
src = """
def f(x):
def g(x):
nonlocal x"""
exc = py.test.raises(SyntaxError, self.func_scope, src).value
assert exc.msg == "name 'x' is parameter and nonlocal"
assert exc.lineno == 4
def test_optimization(self):
assert not self.mod_scope("").can_be_optimized
assert not self.class_scope("class x: pass").can_be_optimized
assert self.func_scope("def f(): pass").can_be_optimized
def test_importstar_nonglobal(self):
src = str(py.code.Source("""
def f():
from re import *
"""))
exc = py.test.raises(SyntaxError, self.mod_scope, src)
assert exc.value.msg == "import * only allowed at module level"
#
src = str(py.code.Source("""
def f():
def g():
from re import *
"""))
exc = py.test.raises(SyntaxError, self.mod_scope, src)
assert exc.value.msg == "import * only allowed at module level"
src = str(py.code.Source("""
if True:
from re import *
"""))
scp = self.mod_scope(src)
assert scp # did not raise
def test_yield(self):
scp = self.func_scope("def f(): yield x")
assert scp.is_generator
for input in ("yield x", "class y: yield x"):
exc = py.test.raises(SyntaxError, self.mod_scope, "yield x").value
assert exc.msg == "'yield' outside function"
for input in ("yield\n return x", "return x\n yield"):
input = "def f():\n " + input
scp = self.func_scope(input)
scp = self.func_scope("def f():\n return\n yield x")
def test_async_def(self):
# CPython compatibility only; "is_generator" is otherwise ignored
scp = self.func_scope("async def f(): pass")
assert not scp.is_generator
scp = self.func_scope("async def f(): await 5")
assert scp.is_generator
def test_yield_inside_try(self):
scp = self.func_scope("def f(): yield x")
assert not scp.has_yield_inside_try
scp = self.func_scope("def f():\n try:\n yield x\n except: pass")
assert scp.has_yield_inside_try
scp = self.func_scope("def f():\n try:\n yield x\n finally: pass")
assert scp.has_yield_inside_try
scp = self.func_scope("def f():\n with x: yield y")
assert scp.has_yield_inside_try
def test_yield_outside_try(self):
for input in ("try: pass\n except: pass",
"try: pass\n except: yield y",
"try: pass\n finally: pass",
"try: pass\n finally: yield y",
"with x: pass"):
input = "def f():\n yield y\n %s\n yield y" % (input,)
assert not self.func_scope(input).has_yield_inside_try
def test_return(self):
for input in ("class x: return", "return"):
exc = py.test.raises(SyntaxError, self.func_scope, input).value
assert exc.msg == "return outside function"
def test_tmpnames(self):
scp = self.mod_scope("with x: pass")
assert scp.lookup("_[1]") == symtable.SCOPE_LOCAL
def test_issue13343(self):
scp = self.mod_scope("lambda *, k1=x, k2: None")
assert scp.lookup("x") == symtable.SCOPE_GLOBAL_IMPLICIT
|
