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|
mod generated;
use std::marker::PhantomData;
use itertools::Itertools;
use {
SmolStr, SyntaxNodeRef, SyntaxKind::*,
yellow::{RefRoot, SyntaxNodeChildren},
};
pub use self::generated::*;
pub trait AstNode<'a>: Clone + Copy + 'a {
fn cast(syntax: SyntaxNodeRef<'a>) -> Option<Self>
where Self: Sized;
fn syntax(self) -> SyntaxNodeRef<'a>;
}
pub trait NameOwner<'a>: AstNode<'a> {
fn name(self) -> Option<Name<'a>> {
child_opt(self)
}
}
pub trait LoopBodyOwner<'a>: AstNode<'a> {
fn loop_body(self) -> Option<Block<'a>> {
child_opt(self)
}
}
pub trait ArgListOwner<'a>: AstNode<'a> {
fn arg_list(self) -> Option<ArgList<'a>> {
child_opt(self)
}
}
pub trait FnDefOwner<'a>: AstNode<'a> {
fn functions(self) -> AstChildren<'a, FnDef<'a>> {
children(self)
}
}
pub trait ModuleItemOwner<'a>: AstNode<'a> {
fn items(self) -> AstChildren<'a, ModuleItem<'a>> {
children(self)
}
}
pub trait TypeParamsOwner<'a>: AstNode<'a> {
fn type_param_list(self) -> Option<TypeParamList<'a>> {
child_opt(self)
}
fn where_clause(self) -> Option<WhereClause<'a>> {
child_opt(self)
}
}
pub trait AttrsOwner<'a>: AstNode<'a> {
fn attrs(self) -> AstChildren<'a, Attr<'a>> {
children(self)
}
}
impl<'a> FnDef<'a> {
pub fn has_atom_attr(&self, atom: &str) -> bool {
self.attrs()
.filter_map(|x| x.as_atom())
.any(|x| x == atom)
}
}
impl<'a> Attr<'a> {
pub fn as_atom(&self) -> Option<SmolStr> {
let tt = self.value()?;
let (_bra, attr, _ket) = tt.syntax().children().collect_tuple()?;
if attr.kind() == IDENT {
Some(attr.leaf_text().unwrap().clone())
} else {
None
}
}
pub fn as_call(&self) -> Option<(SmolStr, TokenTree<'a>)> {
let tt = self.value()?;
let (_bra, attr, args, _ket) = tt.syntax().children().collect_tuple()?;
let args = TokenTree::cast(args)?;
if attr.kind() == IDENT {
Some((attr.leaf_text().unwrap().clone(), args))
} else {
None
}
}
}
impl<'a> Lifetime<'a> {
pub fn text(&self) -> SmolStr {
self.syntax().leaf_text().unwrap().clone()
}
}
impl<'a> Name<'a> {
pub fn text(&self) -> SmolStr {
let ident = self.syntax().first_child()
.unwrap();
ident.leaf_text().unwrap().clone()
}
}
impl<'a> NameRef<'a> {
pub fn text(&self) -> SmolStr {
let ident = self.syntax().first_child()
.unwrap();
ident.leaf_text().unwrap().clone()
}
}
impl<'a> ImplItem<'a> {
pub fn target_type(self) -> Option<TypeRef<'a>> {
match self.target() {
(Some(t), None) | (_, Some(t)) => Some(t),
_ => None,
}
}
pub fn target_trait(self) -> Option<TypeRef<'a>> {
match self.target() {
(Some(t), Some(_)) => Some(t),
_ => None,
}
}
fn target(self) -> (Option<TypeRef<'a>>, Option<TypeRef<'a>>) {
let mut types = children(self);
let first = types.next();
let second = types.next();
(first, second)
}
}
impl<'a> Module<'a> {
pub fn has_semi(self) -> bool {
match self.syntax().last_child() {
None => false,
Some(node) => node.kind() == SEMI,
}
}
}
impl<'a> LetStmt<'a> {
pub fn has_semi(self) -> bool {
match self.syntax().last_child() {
None => false,
Some(node) => node.kind() == SEMI,
}
}
}
impl<'a> IfExpr<'a> {
pub fn then_branch(self) -> Option<Block<'a>> {
self.blocks().nth(0)
}
pub fn else_branch(self) -> Option<Block<'a>> {
self.blocks().nth(1)
}
fn blocks(self) -> AstChildren<'a, Block<'a>> {
children(self)
}
}
fn child_opt<'a, P: AstNode<'a>, C: AstNode<'a>>(parent: P) -> Option<C> {
children(parent).next()
}
fn children<'a, P: AstNode<'a>, C: AstNode<'a>>(parent: P) -> AstChildren<'a, C> {
AstChildren::new(parent.syntax())
}
#[derive(Debug)]
pub struct AstChildren<'a, N> {
inner: SyntaxNodeChildren<RefRoot<'a>>,
ph: PhantomData<N>,
}
impl<'a, N> AstChildren<'a, N> {
fn new(parent: SyntaxNodeRef<'a>) -> Self {
AstChildren {
inner: parent.children(),
ph: PhantomData,
}
}
}
impl<'a, N: AstNode<'a>> Iterator for AstChildren<'a, N> {
type Item = N;
fn next(&mut self) -> Option<N> {
loop {
match N::cast(self.inner.next()?) {
Some(n) => return Some(n),
None => (),
}
}
}
}
|
