Fix alignment of structs and enums.

[gmlarumbe]

Hi,

This PR fixes the alignment of (typedef) enums and structs declarations. Since these were being detected wrongly, the new changes just ignore them when running verilog-pretty-declarations. However, fields inside a struct still get aligned properly.

For example, considering the following example from #1752 discussion:

module pr_example;

logic correct_0;
logic signed [1:0] incorrect_0;
logic correct_1;
logic signed [1:0] incorrect_1;

typedef enum logic [1:0]
{STATE_0,
STATE_1,
STATE_2,
STATE_3} t_incorrect_2;
t_incorrect_2 incorrect_3;

endmodule

After indenting and executing verilog-pretty-declarations this is the result before the PR:

module pr_example;
    
    logic              correct_0;
    logic signed [1:0] incorrect_0;
    logic              correct_1;
    logic signed [1:0] incorrect_1;

    typedef enum       logic [1:0]
                       {STATE_0,
                       STATE_1,
                       STATE_2,
                       STATE_3} t_incorrect_2;
    t_incorrect_2 incorrect_3;
    
endmodule // pr_example

And this is the result after these changes:

module pr_example;
    
    logic              correct_0;
    logic signed [1:0] incorrect_0;
    logic              correct_1;
    logic signed [1:0] incorrect_1;

    typedef enum logic [1:0]
        {STATE_0,
        STATE_1,
        STATE_2,
        STATE_3} t_incorrect_2;
    t_incorrect_2 incorrect_3;
    
endmodule // pr_example

Regarding typedef structs, considering the already indented piece of code:

module pr_example;

    typedef struct packed {
        int field1;
        int unsigned field2;
        logic [7:0] field3;
    } my_type_t;

endmodule

This is the result before running verilog-pretty-declarations at typedef struct line before PR changes:

module pr_example;

    typedef struct packed {
    int            field1;
    int unsigned   field2;
    logic [7:0]    field3;
    } my_type_t;

endmodule

After these changes, there would be no effect if running verilog-pretty-declarations at typedef struct line. However, if running it over one of the field's lines they get properly aligned inside the struct:

module pr_example;

    typedef struct packed {
        int          field1;
        int unsigned field2;
        logic [7:0]  field3;
    } my_type_t;

endmodule

I also added a couple of tests. One of them still needs some indentation fixes (with verilog-indent-lists set to t), but that will come in a different PR.

Thanks!

[wsnyder]

New output looks much better!

[bluewww]

thanks looks like a great change!