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Easy AST validation

Project description

ASTValidate

A series of AST validators for validating the integrity of the tree.

Interface

The stable interface is validate, which comes directly from the root of the package. It takes the tree, and the validation level. Validation level specifies the strictness degree; for an example if it is 1, tree will be only checked by some basic checks that is similiar to PyAST_Validate interface in Python/ast.c. Increasing levels means increasing checks and strictness.

import ast
from astvalidate import validate

tree = ast.parse("def x(): raise X from Y")
assert validate(tree)

If the validator encounters with anything that shouldn't be, it raises a SyntaxError with the node's line number and column offset. Also the original node that caused the error is attached to the exception's node attribute.

tree.body[0].body[0].exc = None
assert validate(tree)
SyntaxError: Raise's cause can't be used without setting an exception

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