How can I retrieve all structures within a Go package?

How to Obtain All Structures Within a Package in Go

Within a Go package, it's possible to obtain a list of all structures in the form of their names or interfaces. To do so, the best approach is to parse the Go source code and specifically isolate the ast.StructType.

Source Parsing

To parse the source code, the Go sources can be cloned using the following command:

hg clone https://code.google.com/p/go/

Once the sources are available, you can isolate the ast.StructType using a pretty printer, as demonstrated in the following code snippet:

func (P *Printer) Type(t *AST.Type) int {
    separator := semicolon;

    switch t.form {

    case AST.STRUCT, AST.INTERFACE:
            switch t.form {
            case AST.STRUCT: P.String(t.pos, "struct");
            case AST.INTERFACE: P.String(t.pos, "interface");
            }
            if t.list != nil {
                    P.separator = blank;
                    P.Fields(t.list, t.end);
            }
            separator = none;
            
    }
}

Alternative Method

Another approach used by the go/lint tool is to perform the same task in its lint.go file:

case *ast.StructType:
        for _, f := range v.Fields.List {
            for _, id := range f.Names {
                check(id, "struct field")
            }
        }

By implementing this approach, you can obtain a list of all structures defined within a specified package.

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