def test_triple_term_expression(self):
"""
Tests a set of triple term expressions
"""
expr = Expression("53+2+37")
self.assertEqual(
"53 2 37 + + ", expr.result(), "ERROR: Add/Add expression"
)
expr = Expression("53+2*37")
self.assertEqual(
"53 2 37 * + ", expr.result(), "ERROR: Add/Multiply expression"
)
expr = Expression("53*2+37")
self.assertEqual(
"53 2 * 37 + ", expr.result(), "ERROR: Multiply/Add expression"
)
expr = Expression("53*2*37")
self.assertEqual(
"53 2 37 * * ",
expr.result(),
"ERROR: Multiply/Multiply expression",
)
def test_whitespace_expression(self):
"""
Tests a set of expressions with a variety of whitespace
"""
expr = Expression("53+2+37")
self.assertEqual(
"53 2 37 + + ", expr.result(), "ERROR: No whitespace expression"
)
expr = Expression("53 + 2 + 37")
self.assertEqual(
"53 2 37 + + ",
expr.result(),
"ERROR: Infixed whitespace expression",
)
expr = Expression(" 53+2+37 ")
self.assertEqual(
"53 2 37 + + ",
expr.result(),
"ERROR: Pre/post-fixed whitespace expression",
)
expr = Expression(" 53 + 2 + 37 ")
self.assertEqual(
"53 2 37 + + ",
expr.result(),
"ERROR: Pre/post/in-fixed whitespace expression",
)
expr = Expression(" 53 + 2 + 37 ")
self.assertEqual(
"53 2 37 + + ",
expr.result(),
"ERROR: Multiple whitespace expression",
)
# This test should throw an exception - spaces in between operands
# should give an error
with self.assertRaises(SyntaxError):
expr = Expression(" 53 + - 2 + 37 ")
expr.parse()
def test_double_term_operands(self):
"""
Tests a set of operands
"""
expr = Expression("53+2")
self.assertEqual(
"53 2 + ", expr.result(), "ERROR: Additive expression"
)
expr = Expression("53-2")
self.assertEqual(
"53 2 - ", expr.result(), "ERROR: Subtrative expression"
)
expr = Expression("53*2")
self.assertEqual(
"53 2 * ", expr.result(), "ERROR: Multiplicative expression"
)
expr = Expression("53/2")
self.assertEqual("53 2 / ", expr.result(), "ERROR: Divide expression")
def test_double_term_expression(self):
"""
Tests a set of double term expressions
"""
expr = Expression("53+2")
self.assertEqual(
"53 2 + ", expr.result(), "ERROR: Double positive term expression"
)
expr = Expression("-53+2")
self.assertEqual(
"-53 2 + ",
expr.result(),
"ERROR: Negative/positive term expression",
)
expr = Expression("53+-2")
self.assertEqual(
"53 -2 + ",
expr.result(),
"ERROR: Positive/negative term expression",
)
expr = Expression("-53+-2")
self.assertEqual(
"-53 -2 + ",
expr.result(),
"ERROR: Double negative term expression",
)
def test_negative_operand_expression(self):
"""
Tests a single negative operand expression
"""
expr = Expression("-53")
self.assertEqual("-53 ", expr.result(), "ERROR: Negative operand")
def test_positive_operand_expression(self):
"""
Tests a single positive operand expression
"""
expr = Expression("53")
self.assertEqual("53 ", expr.result(), "ERROR: Positive operand")
'''
Example code for debugging PyEval
'''
from pyeval_expression import Expression
expr = Expression("53 * -2 + 4")
expr.parse()
print(expr.result())