[capnproto] list of list of list of texts using capnpc-rust

[stewart mackenzie]

Greetings,

(apologies, I'm unsure if the previous message got through, if it did 
please ignore this and reply to the previous email.)

I want to construct a list of list of list of texts.

This is the contract:

@0xf3fc3585f75860e4;

struct ListListListText {
        texts @0 :List(List(List(Text)));
}

This is the mock data:

let mock_commands =
vec![ // a file
    vec![ // lines
        vec![ // pipe symbol contents | |
            vec!["ls1","-l","-a"], // command + arguments
            vec!["ls2","-l","-a"],
        ],
        vec![
            vec!["ls3","-l","-a"],
            vec!["ls4","-l","-a"],
        ],
    ],
    vec![
        vec![
            vec!["ls5","-l","-a"],
            vec!["ls6","-l","-a"],
        ],
        vec![
            vec!["ls7","-l","-a"],
            vec!["ls8","-l","-a"],
        ],
    ],
];

This is the code that fails:

let ip = out_ip.init_root::<list_list_list_text::Builder>();
let mut lines_count: u32 = 0;
for lines in &mock_commands {
    let mut line_count: u32 = 0;
    let ip_lines = ip.init_texts(lines.len() as u32);
    for line in lines {
        let mut pipe_section_count: u32 = 0;
        let ip_line = ip_lines.borrow().set(line_count, 
ip_lines.init_texts(lines.len() as u32));
        for pipe_section in line {
            //let ip_pipe_section = ip_line.init_texts(pipe_section.len() 
as u32);
            for argument in pipe_section {
                //println!("{:?}", argument );
            }
            pipe_section_count += 1;
        }
        line_count += 1;
    }
    lines_count += 1;
}

with:
src/lib.rs:62:41: 62:44 error: no method named `set` found for type 
`capnp::list_list::Builder<'_, 
capnp::list_list::Owned<capnp::text_list::Owned>>` in the current scope
src/lib.rs:62         let ip_line = ip_lines.borrow().set(line_count, 
ip_lines.init_texts(lines.len() as u32));
                                                      ^~~
src/lib.rs:14:1: 125:2 note: in this expansion of component! (defined in 
<rustfbp macros>)
src/lib.rs:62:66: 62:76 error: no method named `init_texts` found for type 
`capnp::list_list::Builder<'_, 
capnp::list_list::Owned<capnp::text_list::Owned>>` in the current scope
src/lib.rs:62         let ip_line = ip_lines.borrow().set(line_count, 
ip_lines.init_texts(lines.len() as u32));
       
The code is obviously wrong, but I want to know what is the correct 
succinct way to initialize list of list of list of texts using Rust?

For example, someone used this technique (in python?): proto.myList = [[1], 
[2,3], [4,5,6]]

Kind regards
Stewart

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