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use crate::ast::ast_node::append_span_source_slice;
use crate::ast::AstNode;
use crate::ast::Name;
use crate::ByteSpan;
use crate::SourceMap;
use crate::SourceSpan;
use crate::token::GraphQLToken;
use inherent::inherent;
/// A type condition (e.g., `on User`) used in fragment
/// definitions and inline fragments.
///
/// See
/// [Type Conditions](https://spec.graphql.org/September2025/#sec-Type-Conditions)
/// in the spec.
#[derive(Clone, Debug, PartialEq)]
pub struct TypeCondition<'src> {
pub named_type: Name<'src>,
pub span: ByteSpan,
pub syntax: Option<Box<TypeConditionSyntax<'src>>>,
}
/// Syntax detail for a [`TypeCondition`].
#[derive(Clone, Debug, PartialEq)]
pub struct TypeConditionSyntax<'src> {
pub on_keyword: GraphQLToken<'src>,
}
#[inherent]
impl AstNode for TypeCondition<'_> {
/// 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 type condition'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 type condition'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)
}
}