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This commit is contained in:
Aleksey Kladov 2019-02-11 21:31:54 +03:00
parent 0d34a256de
commit ae312680d6
2 changed files with 15 additions and 1 deletions
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8
crates/ra_mbe/src/syntax_bridge.rs
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@ -3,12 +3,15 @@ use ra_syntax::{
ast, SyntaxKind::*, TextUnit
};
/// Maps `tt::TokenId` to the relative range of the original token.
#[derive(Default)]
pub struct TokenMap {
/// Maps `tt::TokenId` to the *relative* source range.
toknes: Vec<TextRange>,
}
/// Convert the syntax tree (what user has written) to a `TokenTree` (what macro
/// will consume).
pub fn ast_to_token_tree(ast: &ast::TokenTree) -> Option<(tt::Subtree, TokenMap)> {
let mut token_map = TokenMap::default();
let node = ast.syntax();
@ -17,6 +20,11 @@ pub fn ast_to_token_tree(ast: &ast::TokenTree) -> Option<(tt::Subtree, TokenMap)
}
impl TokenMap {
pub fn relative_range_of(&self, tt: tt::TokenId) -> Option<TextRange> {
let idx = tt.0 as usize;
self.toknes.get(idx).map(|&it| it)
}
fn alloc(&mut self, relative_range: TextRange) -> tt::TokenId {
let id = self.toknes.len();
self.toknes.push(relative_range);