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use super::*;
use std::convert::TryFrom;
#[derive(Clone, Debug)]
pub struct TypeSection {
bytes: Vec<u8>,
num_added: u32,
}
impl TypeSection {
pub fn new() -> TypeSection {
TypeSection {
bytes: vec![],
num_added: 0,
}
}
pub fn function<P, R>(&mut self, params: P, results: R) -> &mut Self
where
P: IntoIterator<Item = ValType>,
P::IntoIter: ExactSizeIterator,
R: IntoIterator<Item = ValType>,
R::IntoIter: ExactSizeIterator,
{
let params = params.into_iter();
let results = results.into_iter();
self.bytes.push(0x60);
self.bytes
.extend(encoders::u32(u32::try_from(params.len()).unwrap()));
self.bytes.extend(params.map(|ty| u8::from(ty)));
self.bytes
.extend(encoders::u32(u32::try_from(results.len()).unwrap()));
self.bytes.extend(results.map(|ty| u8::from(ty)));
self.num_added += 1;
self
}
pub fn module<'a, I, E>(&mut self, imports: I, exports: E) -> &mut Self
where
I: IntoIterator<Item = (&'a str, Option<&'a str>, EntityType)>,
I::IntoIter: ExactSizeIterator,
E: IntoIterator<Item = (&'a str, EntityType)>,
E::IntoIter: ExactSizeIterator,
{
let exports = exports.into_iter();
let imports = imports.into_iter();
self.bytes.push(0x61);
self.bytes
.extend(encoders::u32(u32::try_from(imports.len()).unwrap()));
for (module, name, ty) in imports {
self.bytes.extend(encoders::str(module));
match name {
Some(name) => self.bytes.extend(encoders::str(name)),
None => self.bytes.extend(&[0x00, 0xff]),
}
ty.encode(&mut self.bytes);
}
self.bytes
.extend(encoders::u32(u32::try_from(exports.len()).unwrap()));
for (name, ty) in exports {
self.bytes.extend(encoders::str(name));
ty.encode(&mut self.bytes);
}
self.num_added += 1;
self
}
pub fn instance<'a, E>(&mut self, exports: E) -> &mut Self
where
E: IntoIterator<Item = (&'a str, EntityType)>,
E::IntoIter: ExactSizeIterator,
{
let exports = exports.into_iter();
self.bytes.push(0x62);
self.bytes
.extend(encoders::u32(u32::try_from(exports.len()).unwrap()));
for (name, ty) in exports {
self.bytes.extend(encoders::str(name));
ty.encode(&mut self.bytes);
}
self.num_added += 1;
self
}
}
impl Section for TypeSection {
fn id(&self) -> u8 {
SectionId::Type.into()
}
fn encode<S>(&self, sink: &mut S)
where
S: Extend<u8>,
{
let num_added = encoders::u32(self.num_added);
let n = num_added.len();
sink.extend(
encoders::u32(u32::try_from(n + self.bytes.len()).unwrap())
.chain(num_added)
.chain(self.bytes.iter().copied()),
);
}
}