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use crate::{
encode_section, ComponentExportKind, ComponentSection, ComponentSectionId, ComponentValType,
Encode,
};
/// Represents the possible type bounds for type references.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
pub enum TypeBounds {
/// The type is bounded by equality.
Eq,
}
impl Encode for TypeBounds {
fn encode(&self, sink: &mut Vec<u8>) {
match self {
Self::Eq => sink.push(0x00),
}
}
}
/// Represents a reference to a type.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
pub enum ComponentTypeRef {
/// The reference is to a core module type.
///
/// The index is expected to be core type index to a core module type.
Module(u32),
/// The reference is to a function type.
///
/// The index is expected to be a type index to a function type.
Func(u32),
/// The reference is to a value type.
Value(ComponentValType),
/// The reference is to a bounded type.
///
/// The index is expected to be a type index.
Type(TypeBounds, u32),
/// The reference is to an instance type.
///
/// The index is expected to be a type index to an instance type.
Instance(u32),
/// The reference is to a component type.
///
/// The index is expected to be a type index to a component type.
Component(u32),
}
impl ComponentTypeRef {
/// Gets the export kind of the reference.
pub fn kind(&self) -> ComponentExportKind {
match self {
Self::Module(_) => ComponentExportKind::Module,
Self::Func(_) => ComponentExportKind::Func,
Self::Value(_) => ComponentExportKind::Value,
Self::Type(..) => ComponentExportKind::Type,
Self::Instance(_) => ComponentExportKind::Instance,
Self::Component(_) => ComponentExportKind::Component,
}
}
}
impl Encode for ComponentTypeRef {
fn encode(&self, sink: &mut Vec<u8>) {
self.kind().encode(sink);
match self {
Self::Module(idx) | Self::Func(idx) | Self::Instance(idx) | Self::Component(idx) => {
idx.encode(sink);
}
Self::Value(ty) => ty.encode(sink),
Self::Type(bounds, idx) => {
bounds.encode(sink);
idx.encode(sink);
}
}
}
}
/// An encoder for the import section of WebAssembly components.
///
/// # Example
///
/// ```rust
/// use wasm_encoder::{Component, ComponentTypeSection, PrimitiveValType, ComponentImportSection, ComponentTypeRef};
///
/// let mut types = ComponentTypeSection::new();
///
/// // Define a function type of `[string, string] -> string`.
/// types
/// .function()
/// .params(
/// [
/// ("a", PrimitiveValType::String),
/// ("b", PrimitiveValType::String)
/// ]
/// )
/// .result(PrimitiveValType::String);
///
/// // This imports a function named `f` with the type defined above
/// let mut imports = ComponentImportSection::new();
/// imports.import("f", ComponentTypeRef::Func(0));
///
/// let mut component = Component::new();
/// component.section(&types);
/// component.section(&imports);
///
/// let bytes = component.finish();
/// ```
#[derive(Clone, Debug, Default)]
pub struct ComponentImportSection {
bytes: Vec<u8>,
num_added: u32,
}
impl ComponentImportSection {
/// Create a new component import section encoder.
pub fn new() -> Self {
Self::default()
}
/// The number of imports in the section.
pub fn len(&self) -> u32 {
self.num_added
}
/// Determines if the section is empty.
pub fn is_empty(&self) -> bool {
self.num_added == 0
}
/// Define an import in the component import section.
pub fn import(&mut self, name: &str, ty: ComponentTypeRef) -> &mut Self {
name.encode(&mut self.bytes);
ty.encode(&mut self.bytes);
self.num_added += 1;
self
}
}
impl Encode for ComponentImportSection {
fn encode(&self, sink: &mut Vec<u8>) {
encode_section(sink, self.num_added, &self.bytes);
}
}
impl ComponentSection for ComponentImportSection {
fn id(&self) -> u8 {
ComponentSectionId::Import.into()
}
}
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