def can_use_c_for(self, node):
"""
Check if a for loop can use classic C syntax.
To use C syntax:
- target should not be assign in the loop
- xrange should be use as iterator
- order have to be known at compile time
"""
assert isinstance(node.target, ast.Name)
pattern = ast.Call(func=ast.Attribute(value=ast.Name(id='__builtin__',
ctx=ast.Load(),
annotation=None),
attr='xrange',
ctx=ast.Load()),
args=AST_any(),
keywords=[])
is_assigned = {node.target.id: False}
[
is_assigned.update(self.passmanager.gather(IsAssigned, stmt))
for stmt in node.body
]
if (node.iter not in ASTMatcher(pattern).search(node.iter)
or is_assigned[node.target.id]):
return False
args = node.iter.args
if len(args) < 3:
return True
if isinstance(args[2], ast.Num):
return True
return False
def can_use_c_for(self, node):
"""
Check if a for loop can use classic C syntax.
To use C syntax:
- target should not be assign in the loop
- range should be use as iterator
- order have to be known at compile time
"""
assert isinstance(node.target, ast.Name)
pattern_range = ast.Call(func=ast.Attribute(value=ast.Name(
'builtins', ast.Load(), None, None),
attr='range',
ctx=ast.Load()),
args=AST_any(),
keywords=[])
is_assigned = set()
for stmt in node.body:
is_assigned.update({n.id for n in self.gather(IsAssigned, stmt)})
nodes = ASTMatcher(pattern_range).search(node.iter)
if node.iter not in nodes or node.target.id in is_assigned:
return False
args = node.iter.args
if len(args) < 3:
return True
if isnum(args[2]):
return True
return False
def can_use_c_for(self, node):
"""
Check if a for loop can use classic C syntax.
To use C syntax:
- target should not be assign in the loop
- xrange should be use as iterator
- order have to be known at compile time
"""
assert isinstance(node.target, ast.Name)
if sys.version_info.major == 3:
range_name = 'range'
else:
range_name = 'xrange'
pattern_range = ast.Call(func=ast.Attribute(value=ast.Name(
id='__builtin__', ctx=ast.Load(), annotation=None),
attr=range_name,
ctx=ast.Load()),
args=AST_any(),
keywords=[])
is_assigned = set()
for stmt in node.body:
is_assigned.update(self.gather(IsAssigned, stmt))
nodes = ASTMatcher(pattern_range).search(node.iter)
if node.iter not in nodes or node.target.id in is_assigned:
return False
args = node.iter.args
if len(args) < 3:
return True
if isinstance(args[2], ast.Num):
return True
return False