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//! Represents the WIT language as a tree. This is the central
//! representation of the language.
use crate::{interpreter::Instruction, IRecordType, IType};
use serde::Deserialize;
use serde::Serialize;
use std::str;
use std::sync::Arc;
/// Represents the kind of type.
#[derive(PartialEq, Eq, Debug, Clone, Hash, Serialize, Deserialize)]
pub enum TypeKind {
/// A function type.
Function,
/// A record type.
Record,
}
/// Represents the function argument type.
#[derive(PartialEq, Eq, Debug, Clone, Hash, Serialize, Deserialize)]
pub struct FunctionArg {
/// A function argument name.
pub name: String,
/// A function argument type.
pub ty: IType,
}
/// Represents a type.
#[derive(PartialEq, Eq, Debug, Clone, Hash, Serialize, Deserialize)]
pub enum Type {
/// A function type, like:
///
/// ```wasm,ignore
/// (@interface type (func (param i32 i32) (result string)))
/// ```
Function {
/// Types for the parameters (`(param (name i32))`).
arguments: Arc<Vec<FunctionArg>>,
/// Types for the results (`(result …)`).
output_types: Arc<Vec<IType>>,
},
/// A record type, like:
///
/// ```wasm,ignore
/// (@interface type (record string i32))
/// ```
Record(Arc<IRecordType>),
}
/// Represents an imported function.
#[derive(PartialEq, Eq, Debug, Default, Clone, Hash)]
pub struct Import<'input> {
/// The function namespace.
pub namespace: &'input str,
/// The function name.
pub name: &'input str,
/// The type signature.
pub function_type: u32,
}
/// Represents an exported function signature.
#[derive(PartialEq, Eq, Debug, Default, Clone, Hash)]
pub struct Export<'input> {
/// The export name.
pub name: &'input str,
/// The WIT function type being exported.
pub function_type: u32,
}
/// Represents an adapter.
#[derive(PartialEq, Eq, Debug, Clone, Hash, Serialize, Deserialize)]
pub struct Adapter {
/// The adapter function type.
pub function_type: u32,
/// The instructions.
pub instructions: Vec<Instruction>,
}
/// Represents an implementation.
#[derive(PartialEq, Eq, Debug, Default, Clone, Hash, Serialize, Deserialize)]
pub struct Implementation {
/// The core function type.
pub core_function_type: u32,
/// The adapter function type.
pub adapter_function_type: u32,
}
/// Represents the kind of interface.
#[derive(PartialEq, Eq, Debug, Clone, Hash, Serialize, Deserialize)]
pub enum InterfaceKind {
/// A version.
Version,
/// A type.
Type,
/// An imported function.
Import,
/// An adapter.
Adapter,
/// An exported function.
Export,
/// An implementation.
Implementation,
}
/// Represents a set of interfaces, i.e. it entirely describes a WIT
/// definition.
#[derive(PartialEq, Eq, Debug, Clone, Hash)]
pub struct Interfaces<'input> {
/// Version of IT.
pub version: semver::Version,
/// All the types.
pub types: Vec<Type>,
/// All the imported functions.
pub imports: Vec<Import<'input>>,
/// All the adapters.
pub adapters: Vec<Adapter>,
/// All the exported functions.
pub exports: Vec<Export<'input>>,
/// All the implementations.
pub implementations: Vec<Implementation>,
}
impl Interfaces<'_> {
/// Creates a new Interfaces where version comes from this package version.
pub fn new() -> Self {
use std::str::FromStr;
// it's safe because otherwise it won't compile
let version = semver::Version::from_str(env!("CARGO_PKG_VERSION")).unwrap();
Self {
version,
types: Vec::new(),
imports: Vec::new(),
adapters: Vec::new(),
exports: Vec::new(),
implementations: Vec::new(),
}
}
/// Creates a new Interfaces from the provided version.
pub fn from_version(version: semver::Version) -> Self {
Self {
version,
types: Vec::new(),
imports: Vec::new(),
adapters: Vec::new(),
exports: Vec::new(),
implementations: Vec::new(),
}
}
}
impl Default for Interfaces<'_> {
fn default() -> Self {
Self::new()
}
}