68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
import ast
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import inspect
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import types
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BLOCKS = (
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ast.If,
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ast.For, ast.AsyncFor, ast.While,
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ast.Try,
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ast.With, ast.AsyncWith,
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ast.Match
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)
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def block_scope(f):
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_, pos = inspect.getsourcelines(f)
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source = inspect.getsource(f)
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source = '\n'.join(source.splitlines()[1:]) # remove the decorator first line.
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old_code_obj = f.__code__
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old_ast = ast.parse(source)
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def rewrite(node, varstack):
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if isinstance(node, (ast.Import, ast.ImportFrom)):
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varstack[-1].update(x.asname or x.name for x in node.names)
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if isinstance(node, BLOCKS):
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varstack = varstack + [set()]
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if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef)):
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varstack[-1].add(node.name)
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varstack = varstack + [set(arg.arg for arg in node.args.args)]
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if isinstance(node, (ast.Nonlocal, ast.Global)):
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varstack[-1].update(node.names)
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if isinstance(node, ast.Name):
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if isinstance(node.ctx, ast.Load):
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if all(node.id not in s for s in varstack):
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node.id += "\u200b" * len(varstack)
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elif isinstance(node.ctx, ast.Store):
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varstack[-1].add(node.id)
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for child in ast.iter_child_nodes(node):
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rewrite(child, varstack)
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return node
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new_ast = rewrite(old_ast, [set(f.__globals__) | set(dir(__builtins__))])
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ast.increment_lineno(new_ast, pos)
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new_code_obj = compile(new_ast, old_code_obj.co_filename, "exec")
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new_f = types.FunctionType(new_code_obj.co_consts[0], f.__globals__)
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return new_f
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@block_scope
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def example(demo1, demo2):
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import random as rand
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import random
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from random import randint
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if demo1:
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if random.randint(0, 1) or randint(0, 3) == 3 or rand.randint(0, 5) == 5:
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x = 3
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else:
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x = 4
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print(x) # error
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x = 723
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def test():
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nonlocal x
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x = 4
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if demo2:
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test()
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print(x)
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print(example)
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example(False, True) |