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mod fill_match_arm;
use ra_syntax::{
TextRange, SourceFile, AstNode,
algo::find_node_at_offset,
};
use ra_ide_api_light::{
LocalEdit,
assists::{
Assist,
AssistBuilder
}
};
use crate::{
db::RootDatabase,
FileId
};
/// Return all the assists applicable at the given position.
pub(crate) fn assists(
db: &RootDatabase,
file_id: FileId,
file: &SourceFile,
range: TextRange,
) -> Vec<LocalEdit> {
let ctx = AssistCtx::new(db, file_id, file, range);
[fill_match_arm::fill_match_arm]
.iter()
.filter_map(|&assist| ctx.clone().apply(assist))
.collect()
}
#[derive(Debug, Clone)]
pub struct AssistCtx<'a> {
file_id: FileId,
source_file: &'a SourceFile,
db: &'a RootDatabase,
range: TextRange,
should_compute_edit: bool,
}
impl<'a> AssistCtx<'a> {
pub(crate) fn new(
db: &'a RootDatabase,
file_id: FileId,
source_file: &'a SourceFile,
range: TextRange,
) -> AssistCtx<'a> {
AssistCtx {
source_file,
file_id,
db,
range,
should_compute_edit: false,
}
}
pub fn apply(mut self, assist: fn(AssistCtx) -> Option<Assist>) -> Option<LocalEdit> {
self.should_compute_edit = true;
match assist(self) {
None => None,
Some(Assist::Edit(e)) => Some(e),
Some(Assist::Applicable) => unreachable!(),
}
}
#[allow(unused)]
pub fn check(mut self, assist: fn(AssistCtx) -> Option<Assist>) -> bool {
self.should_compute_edit = false;
match assist(self) {
None => false,
Some(Assist::Edit(_)) => unreachable!(),
Some(Assist::Applicable) => true,
}
}
fn build(self, label: impl Into<String>, f: impl FnOnce(&mut AssistBuilder)) -> Option<Assist> {
if !self.should_compute_edit {
return Some(Assist::Applicable);
}
let mut edit = AssistBuilder::default();
f(&mut edit);
Some(edit.build(label))
}
pub(crate) fn node_at_offset<N: AstNode>(&self) -> Option<&'a N> {
find_node_at_offset(self.source_file.syntax(), self.range.start())
}
}
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