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|
//! This module defines Concrete Syntax Tree (CST), used by rust-analyzer.
//!
//! The CST includes comments and whitespace, provides a single node type,
//! `SyntaxNode`, and a basic traversal API (parent, children, siblings).
//!
//! The *real* implementation is in the (language-agnostic) `rowan` crate, this
//! modules just wraps its API.
use std::{fmt, borrow::Borrow};
use rowan::{Types, TransparentNewType};
use crate::{
SmolStr, SyntaxKind, TextRange, SyntaxText,
syntax_error::SyntaxError,
};
pub use rowan::WalkEvent;
#[derive(Debug, Clone, Copy)]
pub enum RaTypes {}
impl Types for RaTypes {
type Kind = SyntaxKind;
type RootData = Vec<SyntaxError>;
}
pub type GreenNode = rowan::GreenNode<RaTypes>;
#[derive(PartialEq, Eq, Hash)]
pub struct TreeArc<T: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>>(
pub(crate) rowan::TreeArc<RaTypes, T>,
);
impl<T: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>> Borrow<T> for TreeArc<T> {
fn borrow(&self) -> &T {
&*self
}
}
impl<T> TreeArc<T>
where
T: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>,
{
pub(crate) fn cast<U>(this: TreeArc<T>) -> TreeArc<U>
where
U: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>,
{
TreeArc(rowan::TreeArc::cast(this.0))
}
}
impl<T> std::ops::Deref for TreeArc<T>
where
T: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>,
{
type Target = T;
fn deref(&self) -> &T {
self.0.deref()
}
}
impl<T> PartialEq<T> for TreeArc<T>
where
T: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>,
T: PartialEq<T>,
{
fn eq(&self, other: &T) -> bool {
let t: &T = self;
t == other
}
}
impl<T> Clone for TreeArc<T>
where
T: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>,
{
fn clone(&self) -> TreeArc<T> {
TreeArc(self.0.clone())
}
}
impl<T> fmt::Debug for TreeArc<T>
where
T: TransparentNewType<Repr = rowan::SyntaxNode<RaTypes>>,
T: fmt::Debug,
{
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(&self.0, fmt)
}
}
#[derive(PartialEq, Eq, Hash)]
#[repr(transparent)]
pub struct SyntaxNode(pub(crate) rowan::SyntaxNode<RaTypes>);
unsafe impl TransparentNewType for SyntaxNode {
type Repr = rowan::SyntaxNode<RaTypes>;
}
impl SyntaxNode {
pub(crate) fn new(green: GreenNode, errors: Vec<SyntaxError>) -> TreeArc<SyntaxNode> {
let ptr = TreeArc(rowan::SyntaxNode::new(green, errors));
TreeArc::cast(ptr)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Direction {
Next,
Prev,
}
impl SyntaxNode {
pub fn leaf_text(&self) -> Option<&SmolStr> {
self.0.leaf_text()
}
pub fn ancestors(&self) -> impl Iterator<Item = &SyntaxNode> {
crate::algo::generate(Some(self), |&node| node.parent())
}
pub fn descendants(&self) -> impl Iterator<Item = &SyntaxNode> {
self.preorder().filter_map(|event| match event {
WalkEvent::Enter(node) => Some(node),
WalkEvent::Leave(_) => None,
})
}
pub fn siblings(&self, direction: Direction) -> impl Iterator<Item = &SyntaxNode> {
crate::algo::generate(Some(self), move |&node| match direction {
Direction::Next => node.next_sibling(),
Direction::Prev => node.prev_sibling(),
})
}
pub fn preorder(&self) -> impl Iterator<Item = WalkEvent<&SyntaxNode>> {
self.0.preorder().map(|event| match event {
WalkEvent::Enter(n) => WalkEvent::Enter(SyntaxNode::from_repr(n)),
WalkEvent::Leave(n) => WalkEvent::Leave(SyntaxNode::from_repr(n)),
})
}
}
impl ToOwned for SyntaxNode {
type Owned = TreeArc<SyntaxNode>;
fn to_owned(&self) -> TreeArc<SyntaxNode> {
let ptr = TreeArc(self.0.to_owned());
TreeArc::cast(ptr)
}
}
impl SyntaxNode {
pub(crate) fn root_data(&self) -> &Vec<SyntaxError> {
self.0.root_data()
}
pub(crate) fn replace_with(&self, replacement: GreenNode) -> GreenNode {
self.0.replace_self(replacement)
}
pub fn kind(&self) -> SyntaxKind {
self.0.kind()
}
pub fn range(&self) -> TextRange {
self.0.range()
}
pub fn text(&self) -> SyntaxText {
SyntaxText::new(self)
}
pub fn is_leaf(&self) -> bool {
self.0.is_leaf()
}
pub fn parent(&self) -> Option<&SyntaxNode> {
self.0.parent().map(SyntaxNode::from_repr)
}
pub fn first_child(&self) -> Option<&SyntaxNode> {
self.0.first_child().map(SyntaxNode::from_repr)
}
pub fn last_child(&self) -> Option<&SyntaxNode> {
self.0.last_child().map(SyntaxNode::from_repr)
}
pub fn next_sibling(&self) -> Option<&SyntaxNode> {
self.0.next_sibling().map(SyntaxNode::from_repr)
}
pub fn prev_sibling(&self) -> Option<&SyntaxNode> {
self.0.prev_sibling().map(SyntaxNode::from_repr)
}
pub fn children(&self) -> SyntaxNodeChildren {
SyntaxNodeChildren(self.0.children())
}
pub fn memory_size_of_subtree(&self) -> usize {
self.0.memory_size_of_subtree()
}
}
impl fmt::Debug for SyntaxNode {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "{:?}@{:?}", self.kind(), self.range())?;
if has_short_text(self.kind()) {
write!(fmt, " \"{}\"", self.text())?;
}
Ok(())
}
}
#[derive(Debug)]
pub struct SyntaxNodeChildren<'a>(rowan::SyntaxNodeChildren<'a, RaTypes>);
impl<'a> Iterator for SyntaxNodeChildren<'a> {
type Item = &'a SyntaxNode;
fn next(&mut self) -> Option<&'a SyntaxNode> {
self.0.next().map(SyntaxNode::from_repr)
}
}
fn has_short_text(kind: SyntaxKind) -> bool {
use crate::SyntaxKind::*;
match kind {
IDENT | LIFETIME | INT_NUMBER | FLOAT_NUMBER => true,
_ => false,
}
}
|
