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Fix offset bug in SourceWalker

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This commit is contained in:
Edwin Cheng 2019-04-22 04:17:49 +08:00
parent 49c9686c3c
commit 3d1cdc834d
1 changed files with 7 additions and 6 deletions
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13
crates/ra_mbe/src/subtree_source.rs
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@ -21,6 +21,7 @@ impl<'a> From<&'a [tt::TokenTree]> for TokenSeq<'a> {
}
}
#[derive(Debug)]
enum DelimToken<'a> {
Delim(&'a tt::Delimiter, bool),
Token(&'a tt::TokenTree),
@ -52,10 +53,10 @@ impl<'a> TokenSeq<'a> {
}
}
fn child_slice(&self) -> &[tt::TokenTree] {
fn child_slice(&self, pos: usize) -> &[tt::TokenTree] {
match self {
TokenSeq::Subtree(subtree) => &subtree.token_trees,
TokenSeq::Seq(tokens) => &tokens,
TokenSeq::Subtree(subtree) => &subtree.token_trees[pos - 1..],
TokenSeq::Seq(tokens) => &tokens[pos..],
}
}
}
@ -114,7 +115,7 @@ impl<'a> SubTreeWalker<'a> {
WalkCursor::Token(0, convert_delim(subtree.delimiter, false))
}
tt::TokenTree::Leaf(leaf) => {
let next_tokens = self.ts.child_slice();
let next_tokens = self.ts.child_slice(0);
WalkCursor::Token(0, convert_leaf(&next_tokens, leaf))
}
},
@ -190,8 +191,8 @@ impl<'a> SubTreeWalker<'a> {
WalkCursor::Token(new_idx, convert_delim(subtree.delimiter, backward))
}
tt::TokenTree::Leaf(leaf) => {
let next_tokens = top.child_slice();
WalkCursor::Token(pos, convert_leaf(&next_tokens[pos..], leaf))
let next_tokens = top.child_slice(pos);
WalkCursor::Token(pos, convert_leaf(&next_tokens, leaf))
}
},
DelimToken::Delim(delim, is_end) => {