def test_str_expr_replacement(self):
# Signature: name(cls, frm, to, expr_string, func_ok=False)
# replaces all occurences of name 'frm' with 'to' in expr_string
# ('frm' may not occur as a function name on the rhs) ...
# 'to' can be an arbitrary string so this function can also be used for
# argument substitution.
#
# Returns the resulting string.
# from nineml.abstraction_layer.component.util import MathUtil
t = 'b*c + d/(e*sin(f+g/e)) + b1 + e_ / exp(12*g)'
t = MathUtil.str_expr_replacement('b', 'B', t)
self.assertEqual(t, 'B*c + d/(e*sin(f+g/e)) + b1 + e_ / exp(12*g)')
# 'e' is a builtin, so this function doesn't care.
t = MathUtil.str_expr_replacement(frm='e', to='E', expr_string=t)
self.assertEqual(t, 'B*c + d/(E*sin(f+g/E)) + b1 + e_ / exp(12*g)')
def test_get_prefixed_rhs_string(self):
# Signature: name(cls, expr_obj, prefix='', exclude=None)
# No Docstring
# from nineml.abstraction_layer.component.util import MathUtil
e = StrToExpr.alias('a := b*c + d/(e*sin(f+g/e)) + b1 + e_ / exp(12*g)')
rhs_sub = MathUtil.get_prefixed_rhs_string(e, prefix='U_', exclude=['c', 'e_'])
self.assertEqual(
rhs_sub,
'U_b*c + U_d/(e*sin(U_f+U_g/e)) + U_b1 + e_ / exp(12*U_g)'
)
def test_get_rhs_substituted(self):
# Signature: name(cls, expr_obj, namemap)
# No Docstring
# from nineml.abstraction_layer.component.util import MathUtil
e = StrToExpr.alias('a := b*c + d/(e*sin(f+g/e)) + b1 + e_ / exp(12*g)')
rhs_sub = MathUtil.get_rhs_substituted(e, {'b': 'B', 'e': 'E'})
self.assertEqual(
rhs_sub,
'B*c + d/(E*sin(f+g/E)) + b1 + e_ / exp(12*g)'
)
def test_is_single_symbol(self):
# Signature: name(cls, expr)
# Returns ``True`` if the expression is a single symbol, possibly
# surrounded with white-spaces
#
# >>> is_single_symbol('hello')
# True
#
# >>> is_single_symbol('hello * world')
# False
self.assertTrue(MathUtil.is_single_symbol('t'))
self.assertTrue(MathUtil.is_single_symbol('var_1'))
self.assertTrue(MathUtil.is_single_symbol('var_long_name'))
self.assertTrue(MathUtil.is_single_symbol('_myName'))
self.assertFalse(MathUtil.is_single_symbol('r + y'))
self.assertFalse(MathUtil.is_single_symbol('r+y'))
self.assertFalse(MathUtil.is_single_symbol('sin(y)'))