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use crate::ast::{self, kw};
use crate::parser::{Parse, Parser, Result};
/// A WebAssembly event directive, part of the exception handling proposal.
#[derive(Debug)]
pub struct Event<'a> {
/// Where this event was defined
pub span: ast::Span,
/// An optional name by which to refer to this event in name resolution.
pub id: Option<ast::Id<'a>>,
/// Optional export directives for this event.
pub exports: ast::InlineExport<'a>,
/// The type of event that is defined.
pub ty: EventType<'a>,
}
/// Listing of various types of events that can be defined in a wasm module.
#[derive(Clone, Debug)]
pub enum EventType<'a> {
/// An exception event, where the payload is the type signature of the event
/// (constructor parameters, etc).
Exception(ast::TypeUse<'a, ast::FunctionType<'a>>),
}
impl<'a> Parse<'a> for Event<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
let span = parser.parse::<kw::event>()?.0;
let id = parser.parse()?;
let exports = parser.parse()?;
let ty = parser.parse()?;
Ok(Event {
span,
id,
exports,
ty,
})
}
}
impl<'a> Parse<'a> for EventType<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
Ok(EventType::Exception(parser.parse()?))
}
}
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