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use crate::ast::ast_node::append_span_source_slice;
use crate::ast::AstNode;
use crate::ByteSpan;
use crate::SourceMap;
use crate::SourceSpan;
use crate::token::GraphQLToken;
use inherent::inherent;
/// A directive location with its own span (unlike
/// `graphql_parser` which uses a plain enum).
///
/// See
/// [Directive Locations](https://spec.graphql.org/September2025/#DirectiveLocations)
/// in the spec.
#[derive(Clone, Debug, PartialEq)]
pub struct DirectiveLocation<'src> {
pub kind: DirectiveLocationKind,
pub span: ByteSpan,
pub syntax: Option<Box<DirectiveLocationSyntax<'src>>>,
}
/// The kind of location where a directive may be applied.
///
/// See
/// [Directive Locations](https://spec.graphql.org/September2025/#DirectiveLocations)
/// in the spec.
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum DirectiveLocationKind {
ArgumentDefinition,
Enum,
EnumValue,
Field,
FieldDefinition,
FragmentDefinition,
FragmentSpread,
InlineFragment,
InputFieldDefinition,
InputObject,
Interface,
Mutation,
Object,
Query,
Scalar,
Schema,
Subscription,
Union,
VariableDefinition,
}
/// Syntax detail for a [`DirectiveLocation`].
#[derive(Clone, Debug, PartialEq)]
pub struct DirectiveLocationSyntax<'src> {
/// The `|` pipe token before this location (`None` for
/// the first location).
pub pipe: Option<GraphQLToken<'src>>,
/// The location name token (e.g. `FIELD`, `QUERY`).
pub token: GraphQLToken<'src>,
}
#[inherent]
impl AstNode for DirectiveLocation<'_> {
/// See [`AstNode::append_source()`](crate::ast::AstNode::append_source).
pub fn append_source(
&self,
sink: &mut String,
source: Option<&str>,
) {
if let Some(src) = source {
append_span_source_slice(
self.span, sink, src,
);
}
}
/// Returns this directive location'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()`].
#[inline]
pub fn byte_span(&self) -> ByteSpan {
self.span
}
/// Resolves this directive location'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).
#[inline]
pub fn source_span(
&self,
source_map: &SourceMap,
) -> Option<SourceSpan> {
self.byte_span().resolve(source_map)
}
}