Implements a clean plugin architecture with lifecycle events (before_transform_template, before_transform_resource, after_transform_template). The BasePlugin class defines hook points, and specific plugins like GlobalsPlugin and PolicyTemplatesPlugin implement transformation logic. This pattern allows extending SAM functionality without modifying core code and could be reused in other template processing systems.

Resolves CloudFormation intrinsic functions (!Ref, !GetAtt, !Sub, !FindInMap) during template processing. The resolver separates intrinsic detection from execution, with specific actions implemented in actions.py. This self-contained component handles a complex but common problem in infrastructure-as-code tools and could be extracted for use in other template processors.

Converts SAM policy templates into concrete IAM statements with parameter substitution. The processor handles template parsing, variable resolution, and statement generation, enabling least-privilege permissions from reusable policy templates. This solves a recurring security concern in IaC and could be applied to other policy generation scenarios.

Defines a consistent resource modeling pattern where each AWS resource type inherits from a base Resource class, declares property_types and runtime_attrs, and implements to_cloudformation() for transformation. This abstraction is used across Lambda, API, StateMachine, and other resources, providing a clean separation between SAM specification and CloudFormation generation.

Provides utilities for traversing and modifying nested template structures with path-based access. Includes functions for getting, setting, and deleting values at arbitrary paths in dictionaries, handling intrinsic functions appropriately. This solves a common problem in template processing and could be reused in any system working with hierarchical configuration data.