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use crate::ast::AstNode;
use crate::ast::ListTypeAnnotation;
use crate::ast::NamedTypeAnnotation;
use crate::ByteSpan;
use crate::SourceMap;
use crate::SourceSpan;
use inherent::inherent;
/// A GraphQL
/// [type reference](https://spec.graphql.org/September2025/#sec-Type-References)
/// (type annotation).
///
/// Represents [`NamedType`](https://spec.graphql.org/September2025/#NamedType) and
/// [`ListType`](https://spec.graphql.org/September2025/#ListType) from the spec grammar. The spec's
/// [`NonNullType`](https://spec.graphql.org/September2025/#NonNullType) is not a separate variant
/// here — instead, nullability is expressed via the [`Nullability`](crate::ast::Nullability) field
/// on each variant's inner struct.
#[derive(Clone, Debug, PartialEq)]
pub enum TypeAnnotation<'src> {
List(ListTypeAnnotation<'src>),
Named(NamedTypeAnnotation<'src>),
}
impl<'src> TypeAnnotation<'src> {
/// Returns `true` if this type annotation is nullable
/// (i.e. does **not** have a trailing `!`).
pub fn nullable(&self) -> bool {
match self {
Self::List(annot) => annot.nullable(),
Self::Named(annot) => annot.nullable(),
}
}
}
#[inherent]
impl AstNode for TypeAnnotation<'_> {
/// See [`AstNode::append_source()`](crate::ast::AstNode::append_source).
pub fn append_source(
&self,
sink: &mut String,
source: Option<&str>,
) {
match self {
TypeAnnotation::List(v) => {
v.append_source(sink, source)
},
TypeAnnotation::Named(v) => {
v.append_source(sink, source)
},
}
}
/// Returns this type annotation's byte-offset span within
/// the source text.
///
/// The returned [`ByteSpan`] can be resolved to line/column
/// positions via [`source_span()`](Self::source_span) or
/// [`ByteSpan::resolve()`].
pub fn byte_span(&self) -> ByteSpan {
match self {
Self::List(annot) => annot.span,
Self::Named(annot) => annot.span,
}
}
/// Resolves this type annotation's position to line/column
/// coordinates using the given [`SourceMap`].
///
/// Returns [`None`] if the byte offsets cannot be resolved
/// (e.g. the span was synthetically constructed without
/// valid position data).
pub fn source_span(
&self,
source_map: &SourceMap,
) -> Option<SourceSpan> {
self.byte_span().resolve(source_map)
}
}