def test_no_assoc_precedence():
scope = Scope()
op = '=='
slurp = [
'w', (op, op, 4, 'none'), 'x', ('*', '*', 7, 'left'), 'y',
(op, op, 4, 'none'), 'z'
]
pos, ast = scope.parse_binary_subexpr(slurp, slurp[0])
assert ast == ASTCall('==',
List(['w', ASTCall('*', List(['x', 'y'])), 'z']))
def test_precedence():
scope = Scope()
slurp = [
'w', ('+', '+', 6, 'left'), 'x', ('*', '*', 7, 'left'), 'y',
('+', '+', 6, 'left'), 'z'
]
pos, ast = scope.parse_binary_subexpr(slurp, slurp[0])
assert ast == ASTCall(
'+',
List([ASTCall('+', List(['w', ASTCall('*', List(['x', 'y']))])), 'z']))
def test_right():
scope = Scope()
slurp = [
'w', ('^', '^', 6, 'right'), 'x', ('^', '^', 6, 'right'), 'y',
('^', '^', 6, 'right'), 'z'
]
pos, ast = scope.parse_binary_subexpr(slurp, slurp[0])
assert ast == ASTCall(
'^',
List(['w',
ASTCall('^', List(['x', ASTCall('^', List(['y', 'z']))]))]))
def test_multi_no_assoc():
scope = Scope()
op = '=='
slurp = [
'w', (op, op, 4, 'none'), 'x', ('!=', '!=', 4, 'none'), 'y',
(op, op, 4, 'none'), 'z'
]
pos, ast = scope.parse_binary_subexpr(slurp, slurp[0])
assert ast == ASTCall(
'==',
List(
[ASTCall('!=', List([ASTCall('==', List(['w', 'x'])), 'y'])),
'z']))
def test_no_assoc_single():
scope = Scope()
op = '=='
slurp = ['w', (op, op, 4, 'none'), 'x']
pos, ast = scope.parse_binary_subexpr(slurp, slurp[0])
assert ast == ASTCall('==', List(['w', 'x']))
def test_simple():
scope = Scope()
slurp = ['x', ('+', '+', 6, 'left'), 'y']
pos, ast = scope.parse_binary_subexpr(slurp, slurp[0])
assert ast == ASTCall('+', List(['x', 'y']))