annotation

ast-annotation

In some scenarios, we may want the "annotation" feature, specially for code generation scenario.

So we come up with the general annotation solution, including:

• how to define the annotation in your source code;
• some enhancement API for Go AST SDK which allows users to read the annotation from source code.

Annotation Specification

An annotation must follow these two principles:

• The annotation must be part of the document of the specific AST node
• The annotation must follow one of these two patterns:
  • // @annotation_name annotation_value
  • /* @annotation_name annotation_value */

For example:

package main
type (
  // MyType is test type
  // @description my test type
  /* @multi_line first line
     second line
  */
  MyType struct {

  }
)

There are two annotations:

• description => my test type
• multi_line => first line \n second line

if you want to add annotation for type definitions, you cannot use the syntax "type A xxx"

Q & A

Why not fork the AST code and make the enhancement?

It's not worthy doing that.