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Token-based reverse-mapping

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Aleksey Kladov 2019-11-18 15:08:39 +03:00
parent 5e8c22dbf3
commit b79d678923
3 changed files with 52 additions and 38 deletions
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33
crates/ra_ide_api/src/expand.rs
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@ -8,15 +8,32 @@ 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));
let expansion = match node.file_id.expansion_info(db) {
None => {
return FileRange {
file_id: node.file_id.original_file(db),
range: node.ast.text_range(),
}
}
Some(it) => it,
};
// FIXME: the following completely wrong.
//
// *First*, we should try to map first and last tokens of node, and, if that
// fails, return the range of the overall macro expansions.
//
// *Second*, we should handle recurside macro expansions
// FIXME: handle recursive macro generated macro
FileRange { file_id: file_id.original_file(db), range }
let token = node
.ast
.descendants_with_tokens()
.filter_map(|it| it.into_token())
.find_map(|it| expansion.map_token_up(node.with_ast(&it)));
match token {
Some(it) => FileRange { file_id: it.file_id.original_file(db), range: it.ast.text_range() },
None => FileRange { file_id: node.file_id.original_file(db), range: node.ast.text_range() },
}
}
pub(crate) fn descend_into_macros(