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//! Utilities to work with files, produced by macros.
use std::iter::successors;
use hir::Source;
use ra_db::FileId;
use ra_syntax::{ast, AstNode, SyntaxNode, SyntaxToken};
use crate::{db::RootDatabase, FileRange};
pub(crate) fn original_range(db: &RootDatabase, node: Source<&SyntaxNode>) -> FileRange {
let text_range = node.ast.text_range();
let (file_id, range) = node
.file_id
.expansion_info(db)
.and_then(|expansion_info| expansion_info.find_range(text_range))
.unwrap_or((node.file_id, text_range));
// FIXME: handle recursive macro generated macro
FileRange { file_id: file_id.original_file(db), range }
}
pub(crate) fn descend_into_macros(
db: &RootDatabase,
file_id: FileId,
token: SyntaxToken,
) -> Source<SyntaxToken> {
let src = Source::new(file_id.into(), token);
successors(Some(src), |token| {
let macro_call = token.ast.ancestors().find_map(ast::MacroCall::cast)?;
let tt = macro_call.token_tree()?;
if !token.ast.text_range().is_subrange(&tt.syntax().text_range()) {
return None;
}
let source_analyzer =
hir::SourceAnalyzer::new(db, token.with_ast(token.ast.parent()).as_ref(), None);
let exp = source_analyzer.expand(db, ¯o_call)?;
exp.map_token_down(db, token.as_ref())
})
.last()
.unwrap()
}
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