generate WIT syntax from WIT JSON

[ydnar]

The command: go run ./cmd/wit-bindgen-go wit ./testdata/wasi/clocks.wit.json

Generates:

package wasi:poll;

interface poll {
    type pollable = u32;
    drop-pollable: func(this: pollable);
    poll-oneoff: func(in: list<pollable>) -> list<bool>;
}

world example-world {
    import poll;
}


package wasi:clocks;

interface monotonic-clock {
    type instant = u64;
    use wasi:poll/poll.{pollable};
    now: func() -> instant;
    resolution: func() -> instant;
    subscribe: func(when: instant, absolute: bool) -> pollable;
}

interface timezone {
    use wall-clock.{datetime};
    record timezone-display {
        utc-offset: s32,
        name: string,
        in-daylight-saving-time: bool
    };
    display: func(when: datetime) -> timezone-display;
    utc-offset: func(when: datetime) -> s32;
}

interface wall-clock {
    record datetime {
        seconds: u64,
        nanoseconds: u32
    };
    now: func() -> datetime;
    resolution: func() -> datetime;
}

world imports {
    import wasi:poll/poll;
    import monotonic-clock;
    import wall-clock;
    import timezone;
}

TODO

• Serialize WIT syntax with semicolons
  • Use semicolons as delimiters in WIT text format WebAssembly/component-model#249
  • Require semicolons after package too WebAssembly/component-model#257
• Add some helper methods around context, owner, etc to Interface and others