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-rw-r--r--crates/ra_mbe/src/syntax_bridge.rs73
1 files changed, 70 insertions, 3 deletions
diff --git a/crates/ra_mbe/src/syntax_bridge.rs b/crates/ra_mbe/src/syntax_bridge.rs
index 3521b382a..73a0780da 100644
--- a/crates/ra_mbe/src/syntax_bridge.rs
+++ b/crates/ra_mbe/src/syntax_bridge.rs
@@ -118,6 +118,69 @@ impl TokenMap {
118 } 118 }
119} 119}
120 120
121/// Returns the textual content of a doc comment block as a quoted string
122/// That is, strips leading `///` (or `/**`, etc)
123/// and strips the ending `*/`
124/// And then quote the string, which is needed to convert to `tt::Literal`
125fn doc_comment_text(comment: &ast::Comment) -> SmolStr {
126 use ast::AstToken;
127
128 let prefix_len = comment.prefix().len();
129 let mut text = &comment.text()[prefix_len..];
130
131 // Remove ending "*/"
132 if comment.kind().shape == ast::CommentShape::Block {
133 text = &text[0..text.len() - 2];
134 }
135
136 // Quote the string
137 // Note that `tt::Literal` expect an escaped string
138 let text = format!("{:?}", text.escape_default().to_string());
139 text.into()
140}
141
142fn convert_doc_comment<'a>(token: &ra_syntax::SyntaxToken<'a>) -> Option<Vec<tt::TokenTree>> {
143 use ast::AstToken;
144 let comment = ast::Comment::cast(*token)?;
145 let doc = comment.kind().doc?;
146
147 // Make `doc="\" Comments\""
148 let mut meta_tkns = Vec::new();
149 meta_tkns.push(mk_ident("doc"));
150 meta_tkns.push(mk_punct('='));
151 meta_tkns.push(mk_doc_literal(&comment));
152
153 // Make `#![]`
154 let mut token_trees = Vec::new();
155 token_trees.push(mk_punct('#'));
156 if let ast::CommentPlacement::Inner = doc {
157 token_trees.push(mk_punct('!'));
158 }
159 token_trees.push(tt::TokenTree::from(tt::Subtree::from(
160 tt::Subtree { delimiter: tt::Delimiter::Bracket, token_trees: meta_tkns }.into(),
161 )));
162
163 return Some(token_trees);
164
165 // Helper functions
166 fn mk_ident(s: &str) -> tt::TokenTree {
167 tt::TokenTree::from(tt::Leaf::from(tt::Ident {
168 text: s.into(),
169 id: tt::TokenId::unspecified(),
170 }))
171 }
172
173 fn mk_punct(c: char) -> tt::TokenTree {
174 tt::TokenTree::from(tt::Leaf::from(tt::Punct { char: c, spacing: tt::Spacing::Alone }))
175 }
176
177 fn mk_doc_literal(comment: &ast::Comment) -> tt::TokenTree {
178 let lit = tt::Literal { text: doc_comment_text(comment) };
179
180 tt::TokenTree::from(tt::Leaf::from(lit))
181 }
182}
183
121fn convert_tt( 184fn convert_tt(
122 token_map: &mut TokenMap, 185 token_map: &mut TokenMap,
123 global_offset: TextUnit, 186 global_offset: TextUnit,
@@ -141,13 +204,17 @@ fn convert_tt(
141 let mut child_iter = tt.children_with_tokens().skip(skip_first as usize).peekable(); 204 let mut child_iter = tt.children_with_tokens().skip(skip_first as usize).peekable();
142 205
143 while let Some(child) = child_iter.next() { 206 while let Some(child) = child_iter.next() {
144 if (skip_first && (child == first_child || child == last_child)) || child.kind().is_trivia() 207 if skip_first && (child == first_child || child == last_child) {
145 {
146 continue; 208 continue;
147 } 209 }
210
148 match child { 211 match child {
149 SyntaxElement::Token(token) => { 212 SyntaxElement::Token(token) => {
150 if token.kind().is_punct() { 213 if let Some(doc_tokens) = convert_doc_comment(&token) {
214 token_trees.extend(doc_tokens);
215 } else if token.kind().is_trivia() {
216 continue;
217 } else if token.kind().is_punct() {
151 assert!(token.text().len() == 1, "Input ast::token punct must be single char."); 218 assert!(token.text().len() == 1, "Input ast::token punct must be single char.");
152 let char = token.text().chars().next().unwrap(); 219 let char = token.text().chars().next().unwrap();
153 220