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use crate::component::*;
use crate::kw;
use crate::parser::{Cursor, Parse, Parser, Peek, Result};
use crate::token::Index;
use crate::token::{Id, NameAnnotation, Span};
/// An `import` statement and entry in a WebAssembly component.
#[derive(Debug)]
pub struct ComponentImport<'a> {
/// Where this `import` was defined
pub span: Span,
/// The name of the item to import.
pub name: &'a str,
/// The item that's being imported.
pub item: ItemSig<'a>,
}
impl<'a> Parse<'a> for ComponentImport<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
let span = parser.parse::<kw::import>()?.0;
let name = parser.parse()?;
let item = parser.parens(|p| p.parse())?;
Ok(ComponentImport { span, name, item })
}
}
/// An item signature for imported items.
#[derive(Debug)]
pub struct ItemSig<'a> {
/// Where this item is defined in the source.
pub span: Span,
/// An optional identifier used during name resolution to refer to this item
/// from the rest of the component.
pub id: Option<Id<'a>>,
/// An optional name which, for functions, will be stored in the
/// custom `name` section.
pub name: Option<NameAnnotation<'a>>,
/// What kind of item this is.
pub kind: ItemSigKind<'a>,
}
impl<'a> Parse<'a> for ItemSig<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
let mut l = parser.lookahead1();
let (span, parse_kind): (_, fn(Parser<'a>) -> Result<ItemSigKind>) = if l.peek::<kw::core>()
{
let span = parser.parse::<kw::core>()?.0;
parser.parse::<kw::module>()?;
(span, |parser| Ok(ItemSigKind::CoreModule(parser.parse()?)))
} else if l.peek::<kw::func>() {
let span = parser.parse::<kw::func>()?.0;
(span, |parser| Ok(ItemSigKind::Func(parser.parse()?)))
} else if l.peek::<kw::component>() {
let span = parser.parse::<kw::component>()?.0;
(span, |parser| Ok(ItemSigKind::Component(parser.parse()?)))
} else if l.peek::<kw::instance>() {
let span = parser.parse::<kw::instance>()?.0;
(span, |parser| Ok(ItemSigKind::Instance(parser.parse()?)))
} else if l.peek::<kw::value>() {
let span = parser.parse::<kw::value>()?.0;
(span, |parser| Ok(ItemSigKind::Value(parser.parse()?)))
} else if l.peek::<kw::r#type>() {
let span = parser.parse::<kw::r#type>()?.0;
(span, |parser| {
Ok(ItemSigKind::Type(parser.parens(|parser| parser.parse())?))
})
} else {
return Err(l.error());
};
Ok(Self {
span,
id: parser.parse()?,
name: parser.parse()?,
kind: parse_kind(parser)?,
})
}
}
/// The kind of signatures for imported items.
#[derive(Debug)]
pub enum ItemSigKind<'a> {
/// The item signature is for a core module.
CoreModule(CoreTypeUse<'a, ModuleType<'a>>),
/// The item signature is for a function.
Func(ComponentTypeUse<'a, ComponentFunctionType<'a>>),
/// The item signature is for a component.
Component(ComponentTypeUse<'a, ComponentType<'a>>),
/// The item signature is for an instance.
Instance(ComponentTypeUse<'a, InstanceType<'a>>),
/// The item signature is for a value.
Value(ComponentValTypeUse<'a>),
/// The item signature is for a type.
Type(TypeBounds<'a>),
}
/// Represents the bounds applied to types being imported.
#[derive(Debug)]
pub enum TypeBounds<'a> {
/// The equality type bounds.
Eq(Index<'a>),
}
impl<'a> Parse<'a> for TypeBounds<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
// Currently this is the only supported type bounds.
parser.parse::<kw::eq>()?;
Ok(Self::Eq(parser.parse()?))
}
}
/// A listing of a inline `(import "foo")` statement.
///
/// This is the same as `core::InlineImport` except only one string import is
/// required.
#[derive(Debug, Copy, Clone)]
pub struct InlineImport<'a> {
/// The name of the item being imported.
pub name: &'a str,
}
impl<'a> Parse<'a> for InlineImport<'a> {
fn parse(parser: Parser<'a>) -> Result<Self> {
parser.parens(|p| {
p.parse::<kw::import>()?;
Ok(InlineImport { name: p.parse()? })
})
}
}
impl Peek for InlineImport<'_> {
fn peek(cursor: Cursor<'_>) -> bool {
let cursor = match cursor.lparen() {
Some(cursor) => cursor,
None => return false,
};
let cursor = match cursor.keyword() {
Some(("import", cursor)) => cursor,
_ => return false,
};
let cursor = match cursor.string() {
Some((_, cursor)) => cursor,
None => return false,
};
cursor.rparen().is_some()
}
fn display() -> &'static str {
"inline import"
}
}
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