Smoke (and mirrors)
Smoke is a package that exposes a reduced reflective system API. This API includes accessing objects in a dynamic fashion (read properties, write properties, and call methods), inspecting types (for example, whether a method exists), and symbol/string convertion.
The package provides a default implementation of this API that uses the system's mirrors, but additionally provides mechanisms for statically generating code that can replace the mirror-based implementation.
The intention of this package is to allow frameworks to use mirrors in a way that will not impose on their users. The idea is that users will not worry about how to preserve symbols when compiling with dart2js (for instance, using the MirrorsUsed annotation). Instead, this package provides the building blocks to autogenerate whatever is needed for dart2js to be happy and to generate reasonable code.
Note this package alone doesn't know how to generate everything, but it provides a simple API that different frameworks can use to define what needs to be generated.
Smoke reflective API
package:smoke/smoke.dart in your framework to read and write objects and
to inspect type information. Read the Dart-docs for more details.
package:smoke/codegen/recorder.dart in your transformer to create a static
initialization that can be used by smoke. The test under
test/codegen/end_to_end_test.dart is a good illustrating example to learn how
to use these APIs.
- Collects services that can be used to access objects dynamically, inspect type information, and convert between symbols and strings.
Library to generate code that can initialize the
Records accesses to Dart program declarations and generates code that will
allow to do the same accesses at runtime using
package:smoke/static.dart. Internally, this library relies on the
analyzerto extract data from the program, and then uses SmokeCodeGenerator to produce the code needed by the smoke system. [...]
- Implementation of the smoke services using mirrors.
- Static implementation of smoke services using code-generated data.
- Static implementation of smoke services that uses code-generated data and verifies that the results match what we would get with a mirror-based implementation.