witx-codegen 0.11.4

WITX code generator for WebAssembly guest modules.
Documentation 
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use std::io::Write;

use super::*;

impl RustGenerator {
    pub fn define_as_struct<T: Write>(
        w: &mut PrettyWriter<T>,
        name: &str,
        members: &[ASStructMember],
    ) -> Result<(), Error> {
        w.write_line("#[repr(C, packed)]")?
            .write_line("#[derive(Copy,Clone)]")?
            .write_line(format!("pub struct {} {{", name.as_type()))?;
        {
            let mut w = w.new_block();
            for member in members {
                let member_type = member.type_.as_ref();
                w.write_line(format!(
                    "pub {}: {},",
                    member.name.as_var(),
                    member_type.as_lang()
                ))?;

                let pad_len = member.padding;
                for i in 0..(pad_len & 1) {
                    w.write_line(format!("__pad8_{}: u8,", i))?;
                }
                for i in 0..(pad_len & 3) / 2 {
                    w.write_line(format!("__pad16_{}: u16,", i))?;
                }
                for i in 0..(pad_len & 7) / 4 {
                    w.write_line(format!("__pad32_{}: u32,", i))?;
                }
                for i in 0..pad_len / 8 {
                    w.write_line(format!("__pad64_{}: u64,", i))?;
                }
            }
        }
        w.write_line("}")?.eob()?;
        Ok(())
    }
}