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use std::{iter, ops::RangeInclusive};
use arrayvec::ArrayVec;
use ra_fmt::leading_indent;
use ra_syntax::{
algo::{insert_children, replace_children},
ast, AstNode, Direction, InsertPosition, SyntaxElement,
SyntaxKind::*,
T,
};
use ra_text_edit::TextEditBuilder;
use crate::ast_builder::tokens;
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) {
// FIXME: compute a more fine-grained diff here.
// If *you* know a nice algorithm to compute diff between two syntax
// tree, tell me about it!
builder.replace(
self.original_ast.syntax().text_range(),
self.ast().syntax().text().to_string(),
);
}
pub fn ast(&self) -> &N {
&self.ast
}
#[must_use]
fn insert_children(
&self,
position: InsertPosition<SyntaxElement>,
mut to_insert: impl Iterator<Item = SyntaxElement>,
) -> N {
let new_syntax = 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 = replace_children(self.ast().syntax(), to_delete, &mut to_insert);
N::cast(new_syntax).unwrap()
}
fn do_make_multiline(&mut self) {
let l_curly =
match self.ast().syntax().children_with_tokens().find(|it| it.kind() == T!['{']) {
Some(it) => it,
None => return,
};
let sibling = match l_curly.next_sibling_or_token() {
Some(it) => it,
None => return,
};
let existing_ws = match sibling.as_token() {
None => None,
Some(tok) if tok.kind() != WHITESPACE => None,
Some(ws) => {
if ws.text().contains('\n') {
return;
}
Some(ws.clone())
}
};
let indent = leading_indent(self.ast().syntax()).unwrap_or("".into());
let ws = tokens::WsBuilder::new(&format!("\n{}", indent));
let to_insert = iter::once(ws.ws().into());
self.ast = match existing_ws {
None => self.insert_children(InsertPosition::After(l_curly), to_insert),
Some(ws) => {
self.replace_children(RangeInclusive::new(ws.clone().into(), ws.into()), to_insert)
}
};
}
}
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::ItemList> {
pub fn append_items(&mut self, items: impl Iterator<Item = ast::ImplItem>) {
if !self.ast().syntax().text().contains_char('\n') {
self.do_make_multiline();
}
items.for_each(|it| self.append_item(it));
}
pub fn append_item(&mut self, item: ast::ImplItem) {
let (indent, position) = match self.ast().impl_items().last() {
Some(it) => (
leading_indent(it.syntax()).unwrap_or_default().to_string(),
InsertPosition::After(it.syntax().clone().into()),
),
None => match self.l_curly() {
Some(it) => (
" ".to_string() + &leading_indent(self.ast().syntax()).unwrap_or_default(),
InsertPosition::After(it),
),
None => return,
},
};
let ws = tokens::WsBuilder::new(&format!("\n{}", indent));
let to_insert: ArrayVec<[SyntaxElement; 2]> =
[ws.ws().into(), item.syntax().clone().into()].into();
self.ast = self.insert_children(position, to_insert.into_iter());
}
fn l_curly(&self) -> Option<SyntaxElement> {
self.ast().syntax().children_with_tokens().find(|it| it.kind() == T!['{'])
}
}
impl AstEditor<ast::ImplItem> {
pub fn strip_attrs_and_docs(&mut self) {
while let Some(start) = self
.ast()
.syntax()
.children_with_tokens()
.find(|it| it.kind() == ATTR || it.kind() == COMMENT)
{
let end = match &start.next_sibling_or_token() {
Some(el) if el.kind() == WHITESPACE => el.clone(),
Some(_) | None => start.clone(),
};
self.ast = self.replace_children(RangeInclusive::new(start, end), iter::empty());
}
}
}
impl AstEditor<ast::FnDef> {
pub fn set_body(&mut self, body: &ast::Block) {
let mut to_insert: ArrayVec<[SyntaxElement; 2]> = ArrayVec::new();
let old_body_or_semi: SyntaxElement = if let Some(old_body) = self.ast().body() {
old_body.syntax().clone().into()
} else if let Some(semi) = self.ast().semicolon_token() {
to_insert.push(tokens::single_space().into());
semi.into()
} else {
to_insert.push(tokens::single_space().into());
to_insert.push(body.syntax().clone().into());
self.ast = self.insert_children(InsertPosition::Last, to_insert.into_iter());
return;
};
to_insert.push(body.syntax().clone().into());
let replace_range = RangeInclusive::new(old_body_or_semi.clone(), old_body_or_semi);
self.ast = self.replace_children(replace_range, to_insert.into_iter())
}
}
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