51 lines
1.8 KiB
Rust
51 lines
1.8 KiB
Rust
use hir::Semantics;
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use ide_db::{
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base_db::{FilePosition, SourceDatabaseExt},
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LineIndexDatabase, RootDatabase,
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};
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use std::{fmt::Write, time::Instant};
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use syntax::{algo::ancestors_at_offset, ast, AstNode, TextRange};
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// Feature: Interpret Function
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//
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// |===
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// | Editor | Action Name
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//
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// | VS Code | **rust-analyzer: Interpret Function**
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// |===
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pub(crate) fn interpret_function(db: &RootDatabase, position: FilePosition) -> String {
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let start_time = Instant::now();
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let mut result =
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find_and_interpret(db, position).unwrap_or_else(|| "Not inside a function body".to_owned());
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let duration = Instant::now() - start_time;
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writeln!(result).unwrap();
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writeln!(result, "----------------------").unwrap();
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writeln!(result, " Finished in {}s", duration.as_secs_f32()).unwrap();
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result
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}
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fn find_and_interpret(db: &RootDatabase, position: FilePosition) -> Option<String> {
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let sema = Semantics::new(db);
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let source_file = sema.parse(position.file_id);
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let item = ancestors_at_offset(source_file.syntax(), position.offset)
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.filter(|it| !ast::MacroCall::can_cast(it.kind()))
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.find_map(ast::Item::cast)?;
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let def = match item {
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ast::Item::Fn(it) => sema.to_def(&it)?,
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_ => return None,
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};
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let span_formatter = |file_id, text_range: TextRange| {
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let path = &db
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.source_root(db.file_source_root(file_id))
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.path_for_file(&file_id)
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.map(|x| x.to_string());
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let path = path.as_deref().unwrap_or("<unknown file>");
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match db.line_index(file_id).try_line_col(text_range.start()) {
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Some(line_col) => format!("file://{path}#{}:{}", line_col.line + 1, line_col.col),
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None => format!("file://{path} range {:?}", text_range),
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}
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};
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Some(def.eval(db, span_formatter))
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}
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