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|
use super::ItemRef;
use crate::kw;
use crate::parser::{Cursor, Parse, Parser, Peek, Result};
use crate::token::{Id, Index, Span};
/// An entry in a WebAssembly component's export section.
#[derive(Debug)]
pub struct ComponentExport<'a> {
/// Where this export was defined.
pub span: Span,
/// The name of this export from the component.
pub name: &'a str,
/// The kind of export.
pub kind: ComponentExportKind<'a>,
}
impl<'a> Parse<'a> for ComponentExport<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
let span = parser.parse::<kw::export>()?.0;
let name = parser.parse()?;
let kind = parser.parse()?;
Ok(ComponentExport { span, name, kind })
}
}
impl<'a> Parse<'a> for Vec<ComponentExport<'a>> {
fn parse(parser: Parser<'a>) -> Result<Self> {
let mut exports = Vec::new();
while !parser.is_empty() {
exports.push(parser.parens(|parser| parser.parse())?);
}
Ok(exports)
}
}
/// The kind of exported item.
#[derive(Debug)]
pub enum ComponentExportKind<'a> {
/// The export is a core module.
///
/// Note this isn't a core item ref as currently only
/// components can export core modules.
CoreModule(ItemRef<'a, kw::module>),
/// The export is a function.
Func(ItemRef<'a, kw::func>),
/// The export is a value.
Value(ItemRef<'a, kw::value>),
/// The export is a type.
Type(ItemRef<'a, kw::r#type>),
/// The export is a component.
Component(ItemRef<'a, kw::component>),
/// The export is an instance.
Instance(ItemRef<'a, kw::instance>),
}
impl<'a> ComponentExportKind<'a> {
pub(crate) fn module(span: Span, id: Id<'a>) -> Self {
Self::CoreModule(ItemRef {
kind: kw::module(span),
idx: Index::Id(id),
export_names: Default::default(),
})
}
pub(crate) fn component(span: Span, id: Id<'a>) -> Self {
Self::Component(ItemRef {
kind: kw::component(span),
idx: Index::Id(id),
export_names: Default::default(),
})
}
pub(crate) fn instance(span: Span, id: Id<'a>) -> Self {
Self::Instance(ItemRef {
kind: kw::instance(span),
idx: Index::Id(id),
export_names: Default::default(),
})
}
pub(crate) fn func(span: Span, id: Id<'a>) -> Self {
Self::Func(ItemRef {
kind: kw::func(span),
idx: Index::Id(id),
export_names: Default::default(),
})
}
}
impl<'a> Parse<'a> for ComponentExportKind<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
parser.parens(|parser| {
let mut l = parser.lookahead1();
if l.peek::<kw::core>() {
// Remove core prefix
parser.parse::<kw::core>()?;
Ok(Self::CoreModule(parser.parse()?))
} else if l.peek::<kw::func>() {
Ok(Self::Func(parser.parse()?))
} else if l.peek::<kw::value>() {
Ok(Self::Value(parser.parse()?))
} else if l.peek::<kw::r#type>() {
Ok(Self::Type(parser.parse()?))
} else if l.peek::<kw::component>() {
Ok(Self::Component(parser.parse()?))
} else if l.peek::<kw::instance>() {
Ok(Self::Instance(parser.parse()?))
} else {
Err(l.error())
}
})
}
}
impl Peek for ComponentExportKind<'_> {
fn peek(cursor: Cursor) -> bool {
let cursor = match cursor.lparen() {
Some(c) => c,
None => return false,
};
let cursor = match cursor.keyword() {
Some(("core", c)) => match c.keyword() {
Some(("module", c)) => c,
_ => return false,
},
Some(("func", c))
| Some(("value", c))
| Some(("type", c))
| Some(("component", c))
| Some(("instance", c)) => c,
_ => return false,
};
Index::peek(cursor)
}
fn display() -> &'static str {
"component export"
}
}
|
