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use crate::ast::{self, kw};
use crate::parser::{Parse, Parser, Result};
/// An `alias` statement used to juggle indices with nested modules.
#[derive(Debug)]
pub struct Alias<'a> {
/// Where this `alias` was defined.
pub span: ast::Span,
/// An identifier that this alias is resolved with (optionally) for name
/// resolution.
pub id: Option<ast::Id<'a>>,
/// An optional name for this alias stored in the custom `name` section.
pub name: Option<ast::NameAnnotation<'a>>,
/// The item in the parent instance that we're aliasing.
pub kind: AliasKind<'a>,
}
#[derive(Debug)]
#[allow(missing_docs)]
pub enum AliasKind<'a> {
InstanceExport {
instance: ast::ItemRef<'a, kw::instance>,
export: &'a str,
kind: ast::ExportKind,
},
Outer {
/// The index of the module that this reference is referring to.
module: ast::Index<'a>,
/// The index of the item within `module` that this alias is referering
/// to.
index: ast::Index<'a>,
/// The kind of item that's being aliased.
kind: ast::ExportKind,
},
}
impl Alias<'_> {
/// Returns the kind of item defined by this alias.
pub fn item_kind(&self) -> ast::ExportKind {
match self.kind {
AliasKind::InstanceExport { kind, .. } => kind,
AliasKind::Outer { kind, .. } => kind,
}
}
}
impl<'a> Parse<'a> for Alias<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
let span = parser.parse::<kw::alias>()?.0;
let id = parser.parse()?;
let name = parser.parse()?;
let kind = parser.parens(|p| {
let kind = p.parse()?;
Ok(if parser.parse::<Option<kw::outer>>()?.is_some() {
AliasKind::Outer {
module: parser.parse()?,
index: parser.parse()?,
kind,
}
} else {
AliasKind::InstanceExport {
instance: parser.parse::<ast::IndexOrRef<_>>()?.0,
export: parser.parse()?,
kind,
}
})
})?;
Ok(Alias {
span,
id,
name,
kind,
})
}
}
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