def testSettingNew(self):
"""
Setting a non-existent variable should die.
"""
new = {}
env = E.pushFrame(self.env, new)
self.assertRaises(NameError, E.set, env, "a", 3.14)
def testDefinition(self):
"""
Defining z should add it to the innermost frame.
"""
new = {}
env = E.pushFrame(self.env, new)
E.define(env, "z", 4)
self.assertEquals(new["z"], 4)
def testDefinitionShadowing(self):
"""
Defining x should change it in the innermost frame and not
affect the binding of x in the outer frames.
"""
new = {}
env = E.pushFrame(self.env, new)
E.define(env, "x", 5)
self.assertEquals(self.init["x"], 1)
self.assertEquals(new["x"], 5)
def special_let(interp, oform, env):
"(let bindings &body)"
form = oform.pyvalue
bindings = form[1].pyvalue
body = form[2:]
d = {}
for binding in bindings:
name, value = binding.pyvalue
d[name.name] = interp.evalForm(value, env)
newEnv = E.pushFrame(env, d)
r = None
for code in body:
r = interp.evalForm(code, newEnv)
return r
def callFunc(self, interp, args=None):
#print "appending", self
interp.frames.append(self)
if args is not None:
bindings = self.makeBindings(args.pyvalue)
else:
bindings = {}
newEnv = E.pushFrame(self.env, bindings)
r = None
for form in self.body:
self.curform = form
r = interp.evalForm(form, newEnv)
#print "popping", self
interp.frames.pop()
return r
def testLookupInner(self):
second = {"y": 2}
env = E.pushFrame(self.env, second)
self.assertEquals(E.lookup(env, "y"), 2)