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Move jointness censoring to proc_macro
Proc-macro API currently exposes jointness in `Punct` tokens. That is, `+` in `+one` is **non** joint. Our lexer produces jointness info for all tokens, so we need to censor it *somewhere* Previously we did this in a lexer, but it makes more sense to do this in a proc-macro server.
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08deb863bd
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@ -47,15 +47,21 @@ impl ToInternal<token::DelimToken> for Delimiter {
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}
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}
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impl FromInternal<(TreeAndJoint, &'_ ParseSess, &'_ mut Vec<Self>)>
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impl FromInternal<(TreeAndJoint, Option<tokenstream::TokenTree>, &'_ ParseSess, &'_ mut Vec<Self>)>
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for TokenTree<Group, Punct, Ident, Literal>
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{
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fn from_internal(
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((tree, is_joint), sess, stack): (TreeAndJoint, &ParseSess, &mut Vec<Self>),
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((tree, is_joint), look_ahead, sess, stack): (
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TreeAndJoint,
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Option<tokenstream::TokenTree>,
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&ParseSess,
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&mut Vec<Self>,
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),
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) -> Self {
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use rustc_ast::token::*;
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let joint = is_joint == Joint;
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let joint = is_joint == Joint
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&& matches!(look_ahead, Some(tokenstream::TokenTree::Token(t)) if t.is_op());
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let Token { kind, span } = match tree {
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tokenstream::TokenTree::Delimited(span, delim, tts) => {
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let delimiter = Delimiter::from_internal(delim);
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@ -445,7 +451,8 @@ impl server::TokenStreamIter for Rustc<'_> {
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loop {
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let tree = iter.stack.pop().or_else(|| {
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let next = iter.cursor.next_with_joint()?;
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Some(TokenTree::from_internal((next, self.sess, &mut iter.stack)))
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let lookahead = iter.cursor.look_ahead(0);
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Some(TokenTree::from_internal((next, lookahead, self.sess, &mut iter.stack)))
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})?;
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// A hack used to pass AST fragments to attribute and derive macros
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// as a single nonterminal token instead of a token stream.
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@ -262,10 +262,7 @@ impl<'a> TokenTreesReader<'a> {
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}
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_ => {
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let tt = TokenTree::Token(self.token.take());
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let mut is_joint = self.bump();
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if !self.token.is_op() {
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is_joint = NonJoint;
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}
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let is_joint = self.bump();
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Ok((tt, is_joint))
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}
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}
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