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use join_to_string::join;
use libsyntax2::{
File, TextUnit,
ast::{self, AstNode, AttrsOwner, TypeParamsOwner, NameOwner},
SyntaxKind::COMMA,
SyntaxNodeRef,
algo::{
Direction, siblings,
find_leaf_at_offset,
},
};
use {EditBuilder, Edit, find_node_at_offset};
// TODO: rename to FileEdit
#[derive(Debug)]
pub struct LocalEdit {
pub edit: Edit,
pub cursor_position: Option<TextUnit>,
}
pub fn flip_comma<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce() -> LocalEdit + 'a> {
let syntax = file.syntax();
let comma = find_leaf_at_offset(syntax, offset).find(|leaf| leaf.kind() == COMMA)?;
let left = non_trivia_sibling(comma, Direction::Backward)?;
let right = non_trivia_sibling(comma, Direction::Forward)?;
Some(move || {
let mut edit = EditBuilder::new();
edit.replace(left.range(), right.text().to_string());
edit.replace(right.range(), left.text().to_string());
LocalEdit {
edit: edit.finish(),
cursor_position: None,
}
})
}
pub fn add_derive<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce() -> LocalEdit + 'a> {
let nominal = find_node_at_offset::<ast::NominalDef>(file.syntax(), offset)?;
Some(move || {
let derive_attr = nominal
.attrs()
.filter_map(|x| x.as_call())
.filter(|(name, _arg)| name == "derive")
.map(|(_name, arg)| arg)
.next();
let mut edit = EditBuilder::new();
let offset = match derive_attr {
None => {
let node_start = nominal.syntax().range().start();
edit.insert(node_start, "#[derive()]\n".to_string());
node_start + TextUnit::of_str("#[derive(")
}
Some(tt) => {
tt.syntax().range().end() - TextUnit::of_char(')')
}
};
LocalEdit {
edit: edit.finish(),
cursor_position: Some(offset),
}
})
}
pub fn add_impl<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce() -> LocalEdit + 'a> {
let nominal = find_node_at_offset::<ast::NominalDef>(file.syntax(), offset)?;
let name = nominal.name()?;
Some(move || {
let type_params = nominal.type_param_list();
let mut edit = EditBuilder::new();
let start_offset = nominal.syntax().range().end();
let mut buf = String::new();
buf.push_str("\n\nimpl");
if let Some(type_params) = type_params {
type_params.syntax().text()
.push_to(&mut buf);
}
buf.push_str(" ");
buf.push_str(name.text().as_str());
if let Some(type_params) = type_params {
let lifetime_params = type_params.lifetime_params().filter_map(|it| it.lifetime()).map(|it| it.text());
let type_params = type_params.type_params().filter_map(|it| it.name()).map(|it| it.text());
join(lifetime_params.chain(type_params))
.surround_with("<", ">")
.to_buf(&mut buf);
}
buf.push_str(" {\n");
let offset = start_offset + TextUnit::of_str(&buf);
buf.push_str("\n}");
edit.insert(start_offset, buf);
LocalEdit {
edit: edit.finish(),
cursor_position: Some(offset),
}
})
}
fn non_trivia_sibling(node: SyntaxNodeRef, direction: Direction) -> Option<SyntaxNodeRef> {
siblings(node, direction)
.skip(1)
.find(|node| !node.kind().is_trivia())
}
#[cfg(test)]
mod tests {
use super::*;
use test_utils::check_action;
#[test]
fn test_swap_comma() {
check_action(
"fn foo(x: i32,<|> y: Result<(), ()>) {}",
"fn foo(y: Result<(), ()>,<|> x: i32) {}",
|file, off| flip_comma(file, off).map(|f| f()),
)
}
#[test]
fn test_add_derive() {
check_action(
"struct Foo { a: i32, <|>}",
"#[derive(<|>)]\nstruct Foo { a: i32, }",
|file, off| add_derive(file, off).map(|f| f()),
);
check_action(
"struct Foo { <|> a: i32, }",
"#[derive(<|>)]\nstruct Foo { a: i32, }",
|file, off| add_derive(file, off).map(|f| f()),
);
check_action(
"#[derive(Clone)]\nstruct Foo { a: i32<|>, }",
"#[derive(Clone<|>)]\nstruct Foo { a: i32, }",
|file, off| add_derive(file, off).map(|f| f()),
);
}
#[test]
fn test_add_impl() {
check_action(
"struct Foo {<|>}\n",
"struct Foo {}\n\nimpl Foo {\n<|>\n}\n",
|file, off| add_impl(file, off).map(|f| f()),
);
check_action(
"struct Foo<T: Clone> {<|>}",
"struct Foo<T: Clone> {}\n\nimpl<T: Clone> Foo<T> {\n<|>\n}",
|file, off| add_impl(file, off).map(|f| f()),
);
check_action(
"struct Foo<'a, T: Foo<'a>> {<|>}",
"struct Foo<'a, T: Foo<'a>> {}\n\nimpl<'a, T: Foo<'a>> Foo<'a, T> {\n<|>\n}",
|file, off| add_impl(file, off).map(|f| f()),
);
}
}
|
