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mod generated;
use itertools::Itertools;
use smol_str::SmolStr;
use {
SyntaxNode, SyntaxNodeRef, OwnedRoot, TreeRoot, SyntaxError,
SyntaxKind::*,
};
pub use self::generated::*;
pub trait AstNode<R: TreeRoot> {
fn cast(syntax: SyntaxNode<R>) -> Option<Self>
where Self: Sized;
fn syntax(&self) -> &SyntaxNode<R>;
fn syntax_ref<'a>(&'a self) -> SyntaxNodeRef<'a> where R: 'a {
self.syntax().as_ref()
}
}
pub trait NameOwner<R: TreeRoot>: AstNode<R> {
fn name(&self) -> Option<Name<R>> {
self.syntax()
.children()
.filter_map(Name::cast)
.next()
}
}
pub trait AttrsOwner<R: TreeRoot>: AstNode<R> {
fn attrs<'a>(&'a self) -> Box<Iterator<Item=Attr<R>> + 'a> where R: 'a {
let it = self.syntax().children()
.filter_map(Attr::cast);
Box::new(it)
}
}
impl File<OwnedRoot> {
pub fn parse(text: &str) -> Self {
File::cast(::parse(text)).unwrap()
}
}
impl<R: TreeRoot> File<R> {
pub fn errors(&self) -> Vec<SyntaxError> {
self.syntax().root.syntax_root().errors.clone()
}
}
impl<R: TreeRoot> FnDef<R> {
pub fn has_atom_attr(&self, atom: &str) -> bool {
self.attrs()
.filter_map(|x| x.as_atom())
.any(|x| x == atom)
}
}
impl<R: TreeRoot> Attr<R> {
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())
} else {
None
}
}
pub fn as_call(&self) -> Option<(SmolStr, TokenTree<R>)> {
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(), args))
} else {
None
}
}
}
impl<R: TreeRoot> Name<R> {
pub fn text(&self) -> SmolStr {
let ident = self.syntax().first_child()
.unwrap();
ident.leaf_text().unwrap()
}
}
impl<R: TreeRoot> NameRef<R> {
pub fn text(&self) -> SmolStr {
let ident = self.syntax().first_child()
.unwrap();
ident.leaf_text().unwrap()
}
}
impl <R: TreeRoot> ImplItem<R> {
pub fn target_type(&self) -> Option<TypeRef<R>> {
match self.target() {
(Some(t), None) | (_, Some(t)) => Some(t),
_ => None,
}
}
pub fn target_trait(&self) -> Option<TypeRef<R>> {
match self.target() {
(Some(t), Some(_)) => Some(t),
_ => None,
}
}
fn target(&self) -> (Option<TypeRef<R>>, Option<TypeRef<R>>) {
let mut types = self.syntax().children().filter_map(TypeRef::cast);
let first = types.next();
let second = types.next();
(first, second)
}
}
impl <R: TreeRoot> Module<R> {
pub fn has_semi(&self) -> bool {
match self.syntax_ref().last_child() {
None => false,
Some(node) => node.kind() == SEMI,
}
}
}
|
