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use std::{iter, ops::RangeInclusive};
use arrayvec::ArrayVec;
use rustc_hash::FxHashMap;
use ra_fmt::leading_indent;
use ra_syntax::{
algo,
ast::{self, make::tokens, TypeBoundsOwner},
AstNode, Direction, InsertPosition, SyntaxElement, T,
};
use ra_text_edit::TextEditBuilder;
pub struct AstEditor<N: AstNode> {
original_ast: N,
ast: N,
}
impl<N: AstNode> AstEditor<N> {
pub fn new(node: N) -> AstEditor<N>
where
N: Clone,
{
AstEditor { original_ast: node.clone(), ast: node }
}
pub fn into_text_edit(self, builder: &mut TextEditBuilder) {
for (from, to) in algo::diff(&self.original_ast.syntax(), self.ast().syntax()) {
builder.replace(from.text_range(), to.to_string())
}
}
pub fn ast(&self) -> &N {
&self.ast
}
pub fn replace_descendants<T: AstNode>(
&mut self,
replacement_map: impl Iterator<Item = (T, T)>,
) -> &mut Self {
let map = replacement_map
.map(|(from, to)| (from.syntax().clone().into(), to.syntax().clone().into()))
.collect::<FxHashMap<_, _>>();
let new_syntax = algo::replace_descendants(self.ast.syntax(), &map);
self.ast = N::cast(new_syntax).unwrap();
self
}
#[must_use]
fn insert_children(
&self,
position: InsertPosition<SyntaxElement>,
mut to_insert: impl Iterator<Item = SyntaxElement>,
) -> N {
let new_syntax = algo::insert_children(self.ast().syntax(), position, &mut to_insert);
N::cast(new_syntax).unwrap()
}
#[must_use]
fn replace_children(
&self,
to_delete: RangeInclusive<SyntaxElement>,
mut to_insert: impl Iterator<Item = SyntaxElement>,
) -> N {
let new_syntax = algo::replace_children(self.ast().syntax(), to_delete, &mut to_insert);
N::cast(new_syntax).unwrap()
}
}
impl AstEditor<ast::RecordFieldList> {
pub fn append_field(&mut self, field: &ast::RecordField) {
self.insert_field(InsertPosition::Last, field)
}
pub fn insert_field(
&mut self,
position: InsertPosition<&'_ ast::RecordField>,
field: &ast::RecordField,
) {
let is_multiline = self.ast().syntax().text().contains_char('\n');
let ws;
let space = if is_multiline {
ws = tokens::WsBuilder::new(&format!(
"\n{} ",
leading_indent(self.ast().syntax()).unwrap_or("".into())
));
ws.ws()
} else {
tokens::single_space()
};
let mut to_insert: ArrayVec<[SyntaxElement; 4]> = ArrayVec::new();
to_insert.push(space.into());
to_insert.push(field.syntax().clone().into());
to_insert.push(tokens::comma().into());
macro_rules! after_l_curly {
() => {{
let anchor = match self.l_curly() {
Some(it) => it,
None => return,
};
InsertPosition::After(anchor)
}};
}
macro_rules! after_field {
($anchor:expr) => {
if let Some(comma) = $anchor
.syntax()
.siblings_with_tokens(Direction::Next)
.find(|it| it.kind() == T![,])
{
InsertPosition::After(comma)
} else {
to_insert.insert(0, tokens::comma().into());
InsertPosition::After($anchor.syntax().clone().into())
}
};
};
let position = match position {
InsertPosition::First => after_l_curly!(),
InsertPosition::Last => {
if !is_multiline {
// don't insert comma before curly
to_insert.pop();
}
match self.ast().fields().last() {
Some(it) => after_field!(it),
None => after_l_curly!(),
}
}
InsertPosition::Before(anchor) => {
InsertPosition::Before(anchor.syntax().clone().into())
}
InsertPosition::After(anchor) => after_field!(anchor),
};
self.ast = self.insert_children(position, to_insert.iter().cloned());
}
fn l_curly(&self) -> Option<SyntaxElement> {
self.ast().syntax().children_with_tokens().find(|it| it.kind() == T!['{'])
}
}
impl AstEditor<ast::TypeParam> {
pub fn remove_bounds(&mut self) -> &mut Self {
let colon = match self.ast.colon_token() {
Some(it) => it,
None => return self,
};
let end = match self.ast.type_bound_list() {
Some(it) => it.syntax().clone().into(),
None => colon.clone().into(),
};
self.ast = self.replace_children(RangeInclusive::new(colon.into(), end), iter::empty());
self
}
}
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