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use hir::{Function, Semantics};
use hir::db::DefDatabase;
use ide_db::base_db::FilePosition;
use ide_db::RootDatabase;
use syntax::{AstNode, algo::find_node_at_offset, ast};
use std::fmt::Write;
// Feature: View hir
//
// |===
// | Editor | Action Name
//
// | VS Code | **Rust Analyzer: View Hir**
// |===
pub(crate) fn view_hir(db: &RootDatabase, position: FilePosition) -> String {
body_hir(db, position).unwrap_or("Not inside a function body".to_string())
}
fn body_hir(db: &RootDatabase, position: FilePosition) -> Option<String> {
let sema = Semantics::new(db);
let source_file = sema.parse(position.file_id);
let function = find_node_at_offset::<ast::Fn>(
source_file.syntax(),
position.offset,
)?;
let function: Function = sema.to_def(&function)?;
let body = db.body(function.id.into());
let mut result = String::new();
writeln!(&mut result, "== Body expressions ==").ok()?;
for (id, expr) in body.exprs.iter() {
writeln!(&mut result, "{:?}: {:?}", id, expr).ok()?;
}
Some(result)
}
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