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#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct NodeKind(u16);
pub struct File {
text: String,
nodes: Vec<NodeData>,
}
struct NodeData {
kind: NodeKind,
range: (u32, u32),
parent: Option<u32>,
first_child: Option<u32>,
next_sibling: Option<u32>,
}
#[derive(Clone, Copy)]
pub struct Node<'f> {
file: &'f File,
idx: u32,
}
pub struct Children<'f> {
next: Option<Node<'f>>,
}
impl File {
pub fn root<'f>(&'f self) -> Node<'f> {
assert!(!self.nodes.is_empty());
Node { file: self, idx: 0 }
}
}
impl<'f> Node<'f> {
pub fn kind(&self) -> NodeKind {
self.data().kind
}
pub fn text(&self) -> &'f str {
let (start, end) = self.data().range;
&self.file.text[start as usize..end as usize]
}
pub fn parent(&self) -> Option<Node<'f>> {
self.as_node(self.data().parent)
}
pub fn children(&self) -> Children<'f> {
Children { next: self.as_node(self.data().first_child) }
}
fn data(&self) -> &'f NodeData {
&self.file.nodes[self.idx as usize]
}
fn as_node(&self, idx: Option<u32>) -> Option<Node<'f>> {
idx.map(|idx| Node { file: self.file, idx })
}
}
impl<'f> Iterator for Children<'f> {
type Item = Node<'f>;
fn next(&mut self) -> Option<Node<'f>> {
let next = self.next;
self.next = next.and_then(|node| node.as_node(node.data().next_sibling));
next
}
}
pub const ERROR: NodeKind = NodeKind(0);
pub const WHITESPACE: NodeKind = NodeKind(1);
pub const STRUCT_KW: NodeKind = NodeKind(2);
pub const IDENT: NodeKind = NodeKind(3);
pub const L_CURLY: NodeKind = NodeKind(4);
pub const R_CURLY: NodeKind = NodeKind(5);
pub const COLON: NodeKind = NodeKind(6);
pub const COMMA: NodeKind = NodeKind(7);
pub const AMP: NodeKind = NodeKind(8);
pub const LINE_COMMENT: NodeKind = NodeKind(9);
pub const FILE: NodeKind = NodeKind(10);
pub const STRUCT_DEF: NodeKind = NodeKind(11);
pub const FIELD_DEF: NodeKind = NodeKind(12);
pub const TYPE_REF: NodeKind = NodeKind(13);
pub trait AstNode<'f>: Copy + 'f {
fn new(node: Node<'f>) -> Option<Self>;
fn node(&self) -> Node<'f>;
}
pub fn child_of_kind<'f>(node: Node<'f>, kind: NodeKind) -> Option<Node<'f>> {
node.children().find(|child| child.kind() == kind)
}
pub fn ast_children<'f, A: AstNode<'f>>(node: Node<'f>) -> Box<Iterator<Item=A> + 'f> {
Box::new(node.children().filter_map(A::new))
}
#[derive(Clone, Copy)]
pub struct StructDef<'f>(Node<'f>);
#[derive(Clone, Copy)]
pub struct FieldDef<'f>(Node<'f>);
#[derive(Clone, Copy)]
pub struct TypeRef<'f>(Node<'f>);
pub trait NameOwner<'f>: AstNode<'f> {
fn name_ident(&self) -> Node<'f> {
child_of_kind(self.node(), IDENT).unwrap()
}
fn name(&self) -> &'f str { self.name_ident().text() }
}
impl<'f> AstNode<'f> for StructDef<'f> {
fn new(node: Node<'f>) -> Option<Self> {
if node.kind() == STRUCT_DEF { Some(StructDef(node)) } else { None }
}
fn node(&self) -> Node<'f> { self.0 }
}
impl<'f> AstNode<'f> for FieldDef<'f> {
fn new(node: Node<'f>) -> Option<Self> {
if node.kind() == FIELD_DEF { Some(FieldDef(node)) } else { None }
}
fn node(&self) -> Node<'f> { self.0 }
}
impl<'f> AstNode<'f> for TypeRef<'f> {
fn new(node: Node<'f>) -> Option<Self> {
if node.kind() == TYPE_REF { Some(TypeRef(node)) } else { None }
}
fn node(&self) -> Node<'f> { self.0 }
}
impl<'f> NameOwner<'f> for StructDef<'f> {}
impl<'f> NameOwner<'f> for FieldDef<'f> {}
impl<'f> StructDef<'f> {
pub fn fields(&self) -> Box<Iterator<Item=FieldDef<'f>> + 'f> {
ast_children(self.node())
}
}
impl<'f> FieldDef<'f> {
pub fn type_ref(&self) -> Option<TypeRef<'f>> {
ast_children(self.node()).next()
}
}
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