def testEmpty(self):
"""Tests for empty expression
"""
parser = ParserYacc()
# empty expression is allowed, returns None
tree = parser.parse("")
self.assertIsNone(tree)
def testParseParens(self):
"""Tests for identifiers
"""
parser = ParserYacc()
tree = parser.parse('(a)')
self.assertIsInstance(tree, exprTree.Parens)
self.assertIsInstance(tree.expr, exprTree.Identifier)
self.assertEqual(tree.expr.name, 'a')
def testParseIdentifiers(self):
"""Tests for identifiers
"""
parser = ParserYacc()
tree = parser.parse('a')
self.assertIsInstance(tree, exprTree.Identifier)
self.assertEqual(tree.name, 'a')
tree = parser.parse('a.b')
self.assertIsInstance(tree, exprTree.Identifier)
self.assertEqual(tree.name, 'a.b')
def testCompareOps(self):
"""Tests for comparison operators
"""
parser = ParserYacc()
for op in ('=', '!=', '<', '<=', '>', '>='):
tree = parser.parse('a {} 10'.format(op))
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, op)
self.assertIsInstance(tree.lhs, exprTree.Identifier)
self.assertIsInstance(tree.rhs, exprTree.NumericLiteral)
self.assertEqual(tree.lhs.name, 'a')
self.assertEqual(tree.rhs.value, '10')
def testUnaryOps(self):
"""Tests for unary plus and minus
"""
parser = ParserYacc()
tree = parser.parse('+a')
self.assertIsInstance(tree, exprTree.UnaryOp)
self.assertEqual(tree.op, '+')
self.assertIsInstance(tree.operand, exprTree.Identifier)
self.assertEqual(tree.operand.name, 'a')
tree = parser.parse('- x.y')
self.assertIsInstance(tree, exprTree.UnaryOp)
self.assertEqual(tree.op, '-')
self.assertIsInstance(tree.operand, exprTree.Identifier)
self.assertEqual(tree.operand.name, 'x.y')
def testParseLiteral(self):
"""Tests for literals (strings/numbers)
"""
parser = ParserYacc()
tree = parser.parse('1')
self.assertIsInstance(tree, exprTree.NumericLiteral)
self.assertEqual(tree.value, '1')
tree = parser.parse('.5e-2')
self.assertIsInstance(tree, exprTree.NumericLiteral)
self.assertEqual(tree.value, '.5e-2')
tree = parser.parse("'string'")
self.assertIsInstance(tree, exprTree.StringLiteral)
self.assertEqual(tree.value, 'string')
tree = parser.parse("10..20")
self.assertIsInstance(tree, exprTree.RangeLiteral)
self.assertEqual(tree.start, 10)
self.assertEqual(tree.stop, 20)
self.assertEqual(tree.stride, None)
tree = parser.parse("-10 .. 10:5")
self.assertIsInstance(tree, exprTree.RangeLiteral)
self.assertEqual(tree.start, -10)
self.assertEqual(tree.stop, 10)
self.assertEqual(tree.stride, 5)
def testIsIn(self):
"""Tests for IN
"""
parser = ParserYacc()
tree = parser.parse("a in (1,2,'X')")
self.assertIsInstance(tree, exprTree.IsIn)
self.assertFalse(tree.not_in)
self.assertIsInstance(tree.lhs, exprTree.Identifier)
self.assertEqual(tree.lhs.name, 'a')
self.assertIsInstance(tree.values, list)
self.assertEqual(len(tree.values), 3)
self.assertIsInstance(tree.values[0], exprTree.NumericLiteral)
self.assertEqual(tree.values[0].value, '1')
self.assertIsInstance(tree.values[1], exprTree.NumericLiteral)
self.assertEqual(tree.values[1].value, '2')
self.assertIsInstance(tree.values[2], exprTree.StringLiteral)
self.assertEqual(tree.values[2].value, 'X')
tree = parser.parse("10 not in (1000, 2000..3000:100)")
self.assertIsInstance(tree, exprTree.IsIn)
self.assertTrue(tree.not_in)
self.assertIsInstance(tree.lhs, exprTree.NumericLiteral)
self.assertEqual(tree.lhs.value, '10')
self.assertIsInstance(tree.values, list)
self.assertEqual(len(tree.values), 2)
self.assertIsInstance(tree.values[0], exprTree.NumericLiteral)
self.assertEqual(tree.values[0].value, '1000')
self.assertIsInstance(tree.values[1], exprTree.RangeLiteral)
self.assertEqual(tree.values[1].start, 2000)
self.assertEqual(tree.values[1].stop, 3000)
self.assertEqual(tree.values[1].stride, 100)
tree = parser.parse("10 in (-1000, -2000)")
self.assertIsInstance(tree, exprTree.IsIn)
self.assertFalse(tree.not_in)
self.assertIsInstance(tree.lhs, exprTree.NumericLiteral)
self.assertEqual(tree.lhs.value, '10')
self.assertIsInstance(tree.values, list)
self.assertEqual(len(tree.values), 2)
self.assertIsInstance(tree.values[0], exprTree.NumericLiteral)
self.assertEqual(tree.values[0].value, '-1000')
self.assertIsInstance(tree.values[1], exprTree.NumericLiteral)
self.assertEqual(tree.values[1].value, '-2000')
def testBoolOps(self):
"""Tests for boolean operators
"""
parser = ParserYacc()
for op in ('OR', 'AND'):
tree = parser.parse('a {} b'.format(op))
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, op)
self.assertIsInstance(tree.lhs, exprTree.Identifier)
self.assertIsInstance(tree.rhs, exprTree.Identifier)
self.assertEqual(tree.lhs.name, 'a')
self.assertEqual(tree.rhs.name, 'b')
tree = parser.parse('NOT b')
self.assertIsInstance(tree, exprTree.UnaryOp)
self.assertEqual(tree.op, 'NOT')
self.assertIsInstance(tree.operand, exprTree.Identifier)
self.assertEqual(tree.operand.name, 'b')
def testExpression(self):
"""Test for more or less complete expression"""
parser = ParserYacc()
expression = ("((instrument='HSC' AND detector != 9) OR instrument='CFHT') "
"AND tract=8766 AND patch.cell_x > 5 AND "
"patch.cell_y < 4 AND abstract_filter='i'")
tree = parser.parse(expression)
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, 'AND')
self.assertIsInstance(tree.lhs, exprTree.BinaryOp)
# AND is left-associative, so rhs operand will be the
# last sub-expressions
self.assertIsInstance(tree.rhs, exprTree.BinaryOp)
self.assertEqual(tree.rhs.op, '=')
self.assertIsInstance(tree.rhs.lhs, exprTree.Identifier)
self.assertEqual(tree.rhs.lhs.name, 'abstract_filter')
self.assertIsInstance(tree.rhs.rhs, exprTree.StringLiteral)
self.assertEqual(tree.rhs.rhs.value, 'i')
def testStr(self):
"""Test for formatting"""
parser = ParserYacc()
tree = parser.parse("(a+b)")
self.assertEqual(str(tree), '(a + b)')
tree = parser.parse("1 in (1,'x',3)")
self.assertEqual(str(tree), "1 IN (1, 'x', 3)")
tree = parser.parse("a not in (1,'x',3)")
self.assertEqual(str(tree), "a NOT IN (1, 'x', 3)")
tree = parser.parse("(A or B) And NoT (x+3 > y)")
self.assertEqual(str(tree), "(A OR B) AND NOT (x + 3 > y)")
tree = parser.parse("A in (100, 200..300:50)")
self.assertEqual(str(tree), "A IN (100, 200..300:50)")
def testBinaryOps(self):
"""Tests for binary operators
"""
parser = ParserYacc()
tree = parser.parse('a + b')
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, '+')
self.assertIsInstance(tree.lhs, exprTree.Identifier)
self.assertIsInstance(tree.rhs, exprTree.Identifier)
self.assertEqual(tree.lhs.name, 'a')
self.assertEqual(tree.rhs.name, 'b')
tree = parser.parse('a - 2')
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, '-')
self.assertIsInstance(tree.lhs, exprTree.Identifier)
self.assertIsInstance(tree.rhs, exprTree.NumericLiteral)
self.assertEqual(tree.lhs.name, 'a')
self.assertEqual(tree.rhs.value, '2')
tree = parser.parse('2 * 2')
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, '*')
self.assertIsInstance(tree.lhs, exprTree.NumericLiteral)
self.assertIsInstance(tree.rhs, exprTree.NumericLiteral)
self.assertEqual(tree.lhs.value, '2')
self.assertEqual(tree.rhs.value, '2')
tree = parser.parse('1.e5/2')
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, '/')
self.assertIsInstance(tree.lhs, exprTree.NumericLiteral)
self.assertIsInstance(tree.rhs, exprTree.NumericLiteral)
self.assertEqual(tree.lhs.value, '1.e5')
self.assertEqual(tree.rhs.value, '2')
tree = parser.parse('333%76')
self.assertIsInstance(tree, exprTree.BinaryOp)
self.assertEqual(tree.op, '%')
self.assertIsInstance(tree.lhs, exprTree.NumericLiteral)
self.assertIsInstance(tree.rhs, exprTree.NumericLiteral)
self.assertEqual(tree.lhs.value, '333')
self.assertEqual(tree.rhs.value, '76')
def testException(self):
"""Test for exceptional cases"""
def _assertExc(exc, expr, token, pos, lineno, posInLine):
"""Check exception attribute values"""
self.assertEqual(exc.expression, expr)
self.assertEqual(exc.token, token)
self.assertEqual(exc.pos, pos)
self.assertEqual(exc.lineno, lineno)
self.assertEqual(exc.posInLine, posInLine)
parser = ParserYacc()
expression = "(1, 2, 3)"
with self.assertRaises(ParseError) as catcher:
parser.parse(expression)
_assertExc(catcher.exception, expression, ",", 2, 1, 2)
expression = "\n(1\n,\n 2, 3)"
with self.assertRaises(ParseError) as catcher:
parser.parse(expression)
_assertExc(catcher.exception, expression, ",", 4, 3, 0)
def testVisit(self):
"""Test for visitor methods"""
# test should cover all visit* methods
parser = ParserYacc()
visitor = _Visitor()
tree = parser.parse("(a+b)")
result = tree.visit(visitor)
self.assertEqual(result, "P(B(ID(a) + ID(b)))")
tree = parser.parse("(A or B) and not (x + 3 > y)")
result = tree.visit(visitor)
self.assertEqual(result, "B(P(B(ID(A) OR ID(B))) AND U(NOT P(B(B(ID(x) + N(3)) > ID(y)))))")
tree = parser.parse("x in (1,2) AND y NOT IN (1.1, .25, 1e2) OR z in ('a', 'b')")
result = tree.visit(visitor)
self.assertEqual(result, "B(B(IN(ID(x) (N(1), N(2))) AND !IN(ID(y) (N(1.1), N(.25), N(1e2))))"
" OR IN(ID(z) (S(a), S(b))))")
tree = parser.parse("x in (1,2,5..15) AND y NOT IN (-100..100:10)")
result = tree.visit(visitor)
self.assertEqual(result, "B(IN(ID(x) (N(1), N(2), R(5..15))) AND !IN(ID(y) (R(-100..100:10))))")
def testInstantiate(self):
"""Tests for making ParserLex instances
"""
parser = ParserYacc() # noqa: F841