def test_define(self):
exprs.clear()
exprs.define("test_expr", "a + b")
vexprs = visit.Expressions()
self.assertEqual(1, len(vexprs))
self.assertEqual("test_expr", vexprs[0][0])
self.assertEqual("a + b", vexprs[0][1])
exprs.define("test_expr", "b*b")
vexprs = visit.Expressions()
self.assertEqual("test_expr", vexprs[0][0])
self.assertEqual("b*b", vexprs[0][1])
def exists(ename):
"""
Checks if an expression with the given name exists.
"""
expr_names = [expr[0] for expr in visit.Expressions()]
if ename in expr_names:
return True
else:
return False
def clear():
"""
Deletes all existing expressions.
"""
expr_names = [expr[0] for expr in visit.Expressions()]
for ename in expr_names:
try:
visit.DeleteExpression(ename)
except:
# must be a database expression
pass
def test_clear(self):
exprs.clear()
self.assertEqual(0, len(visit.Expressions()))
