transform

Generic AST transformation classes.

comparison	Transformation utilities for STIX pattern comparison expressions.
observation	Transformation utilities for STIX pattern observation expressions.
specials	Some simple comparison expression normalization functions.

class ChainTransformer(*transformers)

A composite transformer which consists of a sequence of sub-transformers. Applying this transformer applies all sub-transformers in sequence, as a group.

transform(ast)

Transform the given AST and return the resulting AST.

Parameters:ast – The AST to transform Returns:A 2-tuple: the transformed AST and a boolean indicating whether the transformation actually changed anything. The change detection is useful in situations where a transformation needs to be repeated until the AST stops changing.

class SettleTransformer(transform)

A transformer that repeatedly performs a transformation until that transformation no longer changes the AST. I.e. the AST has “settled”.

transform(ast)

Transform the given AST and return the resulting AST.

Parameters:ast – The AST to transform Returns:A 2-tuple: the transformed AST and a boolean indicating whether the transformation actually changed anything. The change detection is useful in situations where a transformation needs to be repeated until the AST stops changing.

class Transformer

Base class for AST transformers.

transform(ast)

Transform the given AST and return the resulting AST.

Parameters:ast – The AST to transform Returns:A 2-tuple: the transformed AST and a boolean indicating whether the transformation actually changed anything. The change detection is useful in situations where a transformation needs to be repeated until the AST stops changing.