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use super::{Attribute, Comment, Field, Identifier, Span, WithAttributes, WithDocumentation, WithIdentifier, WithSpan};
/// An opaque identifier for a field in an AST model. Use the
/// `model[field_id]` syntax to resolve the id to an `ast::Field`.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct FieldId(pub(super) u32);
impl FieldId {
/// Used for range bounds when iterating over BTreeMaps.
pub const MIN: FieldId = FieldId(0);
/// Used for range bounds when iterating over BTreeMaps.
pub const MAX: FieldId = FieldId(u32::MAX);
}
impl std::ops::Index<FieldId> for Model {
type Output = Field;
fn index(&self, index: FieldId) -> &Self::Output {
&self.fields[index.0 as usize]
}
}
/// A model declaration.
#[derive(Debug, Clone)]
pub struct Model {
/// The name of the model.
///
/// ```ignore
/// model Foo { .. }
/// ^^^
/// ```
pub(crate) name: Identifier,
/// The fields of the model.
///
/// ```ignore
/// model Foo {
/// id Int @id
/// ^^^^^^^^^^^^^^^^
/// field String
/// ^^^^^^^^^^^^
/// }
/// ```
pub(crate) fields: Vec<Field>,
/// The attributes of this model.
///
/// ```ignore
/// model Foo {
/// id Int @id
/// field String
///
/// @@index([field])
/// ^^^^^^^^^^^^^^^^
/// @@map("Bar")
/// ^^^^^^^^^^^^
/// }
/// ```
pub attributes: Vec<Attribute>,
/// The documentation for this model.
///
/// ```ignore
/// /// Lorem ipsum
/// ^^^^^^^^^^^
/// model Foo {
/// id Int @id
/// field String
/// }
/// ```
pub(crate) documentation: Option<Comment>,
/// Is the model defined as a view in the database.
///
/// ```ignore
/// view Foo {
/// val Int @unique
/// }
/// ```
pub(crate) is_view: bool,
/// The location of this model in the text representation.
pub(crate) span: Span,
}
impl Model {
pub fn iter_fields(&self) -> impl ExactSizeIterator<Item = (FieldId, &Field)> + Clone {
self.fields
.iter()
.enumerate()
.map(|(idx, field)| (FieldId(idx as u32), field))
}
pub fn is_view(&self) -> bool {
self.is_view
}
}
impl WithIdentifier for Model {
fn identifier(&self) -> &Identifier {
&self.name
}
}
impl WithSpan for Model {
fn span(&self) -> Span {
self.span
}
}
impl WithAttributes for Model {
fn attributes(&self) -> &[Attribute] {
&self.attributes
}
}
impl WithDocumentation for Model {
fn documentation(&self) -> Option<&str> {
self.documentation.as_ref().map(|doc| doc.text.as_str())
}
}