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//! Primitive tree editor, ed for trees.
//!
//! The `_raw`-suffixed functions insert elements as is, unsuffixed versions fix
//! up elements around the edges.
use std::{mem, ops::RangeInclusive};
use parser::T;
use crate::{
ast::{self, edit::IndentLevel, make, AstNode},
SyntaxElement, SyntaxKind, SyntaxNode, SyntaxToken,
};
/// Utility trait to allow calling `ted` functions with references or owned
/// nodes. Do not use outside of this module.
pub trait Element {
fn syntax_element(self) -> SyntaxElement;
}
impl<E: Element + Clone> Element for &'_ E {
fn syntax_element(self) -> SyntaxElement {
self.clone().syntax_element()
}
}
impl Element for SyntaxElement {
fn syntax_element(self) -> SyntaxElement {
self
}
}
impl Element for SyntaxNode {
fn syntax_element(self) -> SyntaxElement {
self.into()
}
}
impl Element for SyntaxToken {
fn syntax_element(self) -> SyntaxElement {
self.into()
}
}
#[derive(Debug)]
pub struct Position {
repr: PositionRepr,
}
#[derive(Debug)]
enum PositionRepr {
FirstChild(SyntaxNode),
After(SyntaxElement),
}
impl Position {
pub fn after(elem: impl Element) -> Position {
let repr = PositionRepr::After(elem.syntax_element());
Position { repr }
}
pub fn before(elem: impl Element) -> Position {
let elem = elem.syntax_element();
let repr = match elem.prev_sibling_or_token() {
Some(it) => PositionRepr::After(it),
None => PositionRepr::FirstChild(elem.parent().unwrap()),
};
Position { repr }
}
pub fn first_child_of(node: &(impl Into<SyntaxNode> + Clone)) -> Position {
let repr = PositionRepr::FirstChild(node.clone().into());
Position { repr }
}
pub fn last_child_of(node: &(impl Into<SyntaxNode> + Clone)) -> Position {
let node = node.clone().into();
let repr = match node.last_child_or_token() {
Some(it) => PositionRepr::After(it),
None => PositionRepr::FirstChild(node),
};
Position { repr }
}
}
pub fn insert(position: Position, elem: impl Element) {
insert_all(position, vec![elem.syntax_element()])
}
pub fn insert_raw(position: Position, elem: impl Element) {
insert_all_raw(position, vec![elem.syntax_element()])
}
pub fn insert_all(position: Position, mut elements: Vec<SyntaxElement>) {
if let Some(first) = elements.first() {
if let Some(ws) = ws_before(&position, first) {
elements.insert(0, ws.into())
}
}
if let Some(last) = elements.last() {
if let Some(ws) = ws_after(&position, last) {
elements.push(ws.into())
}
}
insert_all_raw(position, elements)
}
pub fn insert_all_raw(position: Position, elements: Vec<SyntaxElement>) {
let (parent, index) = match position.repr {
PositionRepr::FirstChild(parent) => (parent, 0),
PositionRepr::After(child) => (child.parent().unwrap(), child.index() + 1),
};
parent.splice_children(index..index, elements);
}
pub fn remove(elem: impl Element) {
elem.syntax_element().detach()
}
pub fn remove_all(range: RangeInclusive<SyntaxElement>) {
replace_all(range, Vec::new())
}
pub fn remove_all_iter(range: impl IntoIterator<Item = SyntaxElement>) {
let mut it = range.into_iter();
if let Some(mut first) = it.next() {
match it.last() {
Some(mut last) => {
if first.index() > last.index() {
mem::swap(&mut first, &mut last)
}
remove_all(first..=last)
}
None => remove(first),
}
}
}
pub fn replace(old: impl Element, new: impl Element) {
replace_with_many(old, vec![new.syntax_element()])
}
pub fn replace_with_many(old: impl Element, new: Vec<SyntaxElement>) {
let old = old.syntax_element();
replace_all(old.clone()..=old, new)
}
pub fn replace_all(range: RangeInclusive<SyntaxElement>, new: Vec<SyntaxElement>) {
let start = range.start().index();
let end = range.end().index();
let parent = range.start().parent().unwrap();
parent.splice_children(start..end + 1, new)
}
pub fn append_child(node: &(impl Into<SyntaxNode> + Clone), child: impl Element) {
let position = Position::last_child_of(node);
insert(position, child)
}
pub fn append_child_raw(node: &(impl Into<SyntaxNode> + Clone), child: impl Element) {
let position = Position::last_child_of(node);
insert_raw(position, child)
}
fn ws_before(position: &Position, new: &SyntaxElement) -> Option<SyntaxToken> {
let prev = match &position.repr {
PositionRepr::FirstChild(_) => return None,
PositionRepr::After(it) if it.kind() == SyntaxKind::L_CURLY => {
if new.kind() == SyntaxKind::USE {
if let Some(item_list) = it.parent().and_then(ast::ItemList::cast) {
let mut indent = IndentLevel::from_element(&item_list.syntax().clone().into());
indent.0 += 1;
return Some(make::tokens::whitespace(&format!("\n{}", indent)));
}
}
it
}
PositionRepr::After(it) => it,
};
ws_between(prev, new)
}
fn ws_after(position: &Position, new: &SyntaxElement) -> Option<SyntaxToken> {
let next = match &position.repr {
PositionRepr::FirstChild(parent) => parent.first_child_or_token()?,
PositionRepr::After(sibling) => sibling.next_sibling_or_token()?,
};
ws_between(new, &next)
}
fn ws_between(left: &SyntaxElement, right: &SyntaxElement) -> Option<SyntaxToken> {
if left.kind() == SyntaxKind::WHITESPACE || right.kind() == SyntaxKind::WHITESPACE {
return None;
}
if right.kind() == T![;] || right.kind() == T![,] {
return None;
}
if left.kind() == T![<] || right.kind() == T![>] {
return None;
}
if left.kind() == T![&] && right.kind() == SyntaxKind::LIFETIME {
return None;
}
if right.kind() == SyntaxKind::GENERIC_ARG_LIST {
return None;
}
if right.kind() == SyntaxKind::USE {
let mut indent = IndentLevel::from_element(left);
if left.kind() == SyntaxKind::USE {
indent.0 = IndentLevel::from_element(right).0.max(indent.0);
}
return Some(make::tokens::whitespace(&format!("\n{}", indent)));
}
Some(make::tokens::single_space())
}
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