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use crate::ast::AstNode;
use crate::ast::DirectiveAnnotation;
use crate::ast::FieldSelection;
use crate::ast::FragmentSpread;
use crate::ast::InlineFragment;
use crate::ast::Name;
use crate::ByteSpan;
use crate::SourceMap;
use crate::SourceSpan;
use inherent::inherent;
/// A single selection within a selection set.
///
/// See
/// [Selection Sets](https://spec.graphql.org/September2025/#sec-Selection-Sets)
/// in the spec.
#[derive(Clone, Debug, PartialEq)]
pub enum Selection<'src> {
Field(FieldSelection<'src>),
FragmentSpread(FragmentSpread<'src>),
InlineFragment(InlineFragment<'src>),
}
impl<'src> Selection<'src> {
/// Returns the directive annotations applied to this selection.
pub fn directive_annotations(&self) -> &[DirectiveAnnotation<'src>] {
match self {
Self::Field(s) => &s.directives,
Self::FragmentSpread(s) => &s.directives,
Self::InlineFragment(s) => &s.directives,
}
}
/// Returns the name of this selection, or [`None`] for
/// inline fragments (which have no name).
pub fn name(&self) -> Option<&Name<'src>> {
match self {
Self::Field(s) => Some(&s.name),
Self::FragmentSpread(s) => Some(&s.name),
Self::InlineFragment(_) => None,
}
}
/// Returns the name of this selection as a string slice,
/// or [`None`] for inline fragments.
///
/// Convenience accessor for `self.name().value`.
pub fn name_value(&self) -> Option<&str> {
self.name().map(|n| n.value.as_ref())
}
}
#[inherent]
impl AstNode for Selection<'_> {
/// See [`AstNode::append_source()`](crate::ast::AstNode::append_source).
pub fn append_source(
&self,
sink: &mut String,
source: Option<&str>,
) {
match self {
Selection::Field(s) => {
s.append_source(sink, source)
},
Selection::FragmentSpread(s) => {
s.append_source(sink, source)
},
Selection::InlineFragment(s) => {
s.append_source(sink, source)
},
}
}
/// Returns this selection'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::Field(s) => s.span,
Self::FragmentSpread(s) => s.span,
Self::InlineFragment(s) => s.span,
}
}
/// Resolves this selection'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)
}
}