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Add map_id to TokenId

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This commit is contained in:
Edwin Cheng 2019-11-03 13:19:50 +08:00
parent d9fb01f803
commit 9fd546bec2
2 changed files with 34 additions and 5 deletions
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23
crates/ra_mbe/src/syntax_bridge.rs
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@ -12,12 +12,26 @@ use tt::buffer::{Cursor, TokenBuffer};
use crate::subtree_source::SubtreeTokenSource;
use crate::ExpandError;
use std::sync::atomic::{AtomicU32, Ordering};
/// Maps `tt::TokenId` to the relative range of the original token.
#[derive(Default)]
pub struct TokenMap {
/// Maps `tt::TokenId` to the *relative* source range.
tokens: Vec<TextRange>,
map_id: u32,
}
static TOKEN_MAP_COUNTER: AtomicU32 = AtomicU32::new(0);
/// Generate an unique token map id for each instance
fn make_uniq_token_map_id() -> u32 {
TOKEN_MAP_COUNTER.fetch_add(1, Ordering::SeqCst)
}
impl std::default::Default for TokenMap {
fn default() -> TokenMap {
TokenMap { tokens: Default::default(), map_id: make_uniq_token_map_id() }
}
}
/// Convert the syntax tree (what user has written) to a `TokenTree` (what macro
@ -105,14 +119,17 @@ pub fn token_tree_to_items(tt: &tt::Subtree) -> Result<Parse<ast::MacroItems>, E
impl TokenMap {
pub fn relative_range_of(&self, tt: tt::TokenId) -> Option<TextRange> {
let idx = tt.0 as usize;
if self.map_id != tt.map_id() {
return None;
}
let idx = tt.token_id() as usize;
self.tokens.get(idx).copied()
}
fn alloc(&mut self, relative_range: TextRange) -> tt::TokenId {
let id = self.tokens.len();
self.tokens.push(relative_range);
tt::TokenId(id as u32)
tt::TokenId::new(id as u32, self.map_id)
}
}