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simplify

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This commit is contained in:
Aleksey Kladov 2019-04-02 10:09:52 +03:00
parent bd1f5ba222
commit f874d372bb
1 changed files with 19 additions and 23 deletions
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42
crates/ra_syntax/src/ast.rs
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@ -30,6 +30,25 @@ pub trait AstNode:
fn syntax(&self) -> &SyntaxNode; fn syntax(&self) -> &SyntaxNode;
} }
#[derive(Debug)]
pub struct AstChildren<'a, N> {
inner: SyntaxNodeChildren<'a>,
ph: PhantomData<N>,
}
impl<'a, N> AstChildren<'a, N> {
fn new(parent: &'a SyntaxNode) -> Self {
AstChildren { inner: parent.children(), ph: PhantomData }
}
}
impl<'a, N: AstNode + 'a> Iterator for AstChildren<'a, N> {
type Item = &'a N;
fn next(&mut self) -> Option<&'a N> {
self.inner.by_ref().find_map(N::cast)
}
}
impl Attr { impl Attr {
pub fn is_inner(&self) -> bool { pub fn is_inner(&self) -> bool {
let tt = match self.value() { let tt = match self.value() {
@ -331,29 +350,6 @@ fn children<P: AstNode, C: AstNode>(parent: &P) -> AstChildren<C> {
AstChildren::new(parent.syntax()) AstChildren::new(parent.syntax())
} }
#[derive(Debug)]
pub struct AstChildren<'a, N> {
inner: SyntaxNodeChildren<'a>,
ph: PhantomData<N>,
}
impl<'a, N> AstChildren<'a, N> {
fn new(parent: &'a SyntaxNode) -> Self {
AstChildren { inner: parent.children(), ph: PhantomData }
}
}
impl<'a, N: AstNode + 'a> Iterator for AstChildren<'a, N> {
type Item = &'a N;
fn next(&mut self) -> Option<&'a N> {
loop {
if let Some(n) = N::cast(self.inner.next()?) {
return Some(n);
}
}
}
}
#[derive(Debug, Clone, PartialEq, Eq)] #[derive(Debug, Clone, PartialEq, Eq)]
pub enum StructFlavor<'a> { pub enum StructFlavor<'a> {
Tuple(&'a PosFieldDefList), Tuple(&'a PosFieldDefList),