1 //! "Recursive" Syntax highlighting for code in doctests and fixtures.
6 use hir::{InFile, Semantics};
7 use ide_db::{call_info::ActiveParameter, helpers::rust_doc::is_rust_fence, SymbolKind};
9 ast::{self, AstNode, IsString},
10 AstToken, NodeOrToken, SyntaxNode, SyntaxToken, TextRange, TextSize,
14 doc_links::{doc_attributes, extract_definitions_from_docs, resolve_doc_path_for_def},
15 syntax_highlighting::{highlights::Highlights, injector::Injector},
16 Analysis, HlMod, HlRange, HlTag, RootDatabase,
19 pub(super) fn ra_fixture(
21 sema: &Semantics<RootDatabase>,
23 expanded: SyntaxToken,
25 let active_parameter = ActiveParameter::at_token(sema, expanded)?;
26 if !active_parameter.ident().map_or(false, |name| name.text().starts_with("ra_fixture")) {
29 let value = literal.value()?;
31 if let Some(range) = literal.open_quote_text_range() {
32 hl.add(HlRange { range, highlight: HlTag::StringLiteral.into(), binding_hash: None })
35 let mut inj = Injector::default();
37 let mut text = &*value;
38 let mut offset: TextSize = 0.into();
40 while !text.is_empty() {
42 let idx = text.find(marker).unwrap_or(text.len());
43 let (chunk, next) = text.split_at(idx);
44 inj.add(chunk, TextRange::at(offset, TextSize::of(chunk)));
47 offset += TextSize::of(chunk);
49 if let Some(next) = text.strip_prefix(marker) {
50 if let Some(range) = literal.map_range_up(TextRange::at(offset, TextSize::of(marker))) {
51 hl.add(HlRange { range, highlight: HlTag::Keyword.into(), binding_hash: None });
56 let marker_len = TextSize::of(marker);
61 let (analysis, tmp_file_id) = Analysis::from_single_file(inj.text().to_string());
63 for mut hl_range in analysis.highlight(tmp_file_id).unwrap() {
64 for range in inj.map_range_up(hl_range.range) {
65 if let Some(range) = literal.map_range_up(range) {
66 hl_range.range = range;
72 if let Some(range) = literal.close_quote_text_range() {
73 hl.add(HlRange { range, highlight: HlTag::StringLiteral.into(), binding_hash: None })
79 const RUSTDOC_FENCE: &'static str = "```";
81 /// Injection of syntax highlighting of doctests.
82 pub(super) fn doc_comment(
84 sema: &Semantics<RootDatabase>,
85 node: InFile<&SyntaxNode>,
87 let (attributes, def) = match doc_attributes(sema, node.value) {
92 let mut inj = Injector::default();
93 inj.add_unmapped("fn doctest() {\n");
95 let attrs_source_map = attributes.source_map(sema.db);
97 let mut is_codeblock = false;
98 let mut is_doctest = false;
100 // Replace the original, line-spanning comment ranges by new, only comment-prefix
101 // spanning comment ranges.
102 let mut new_comments = Vec::new();
105 if let Some((docs, doc_mapping)) = attributes.docs_with_rangemap(sema.db) {
106 extract_definitions_from_docs(&docs)
108 .filter_map(|(range, link, ns)| {
109 doc_mapping.map(range).filter(|mapping| mapping.file_id == node.file_id).and_then(
110 |InFile { value: mapped_range, .. }| {
111 Some(mapped_range).zip(resolve_doc_path_for_def(sema.db, def, &link, ns))
115 .for_each(|(range, def)| {
118 highlight: module_def_to_hl_tag(def)
119 | HlMod::Documentation
121 | HlMod::IntraDocLink,
127 for attr in attributes.by_key("doc").attrs() {
128 let InFile { file_id, value: src } = attrs_source_map.source_of(attr);
129 if file_id != node.file_id {
132 let (line, range, prefix) = match &src {
133 Either::Left(it) => {
134 string = match find_doc_string_in_attr(attr, it) {
138 let text_range = string.syntax().text_range();
139 let text_range = TextRange::new(
140 text_range.start() + TextSize::from(1),
141 text_range.end() - TextSize::from(1),
143 let text = string.text();
144 (&text[1..text.len() - 1], text_range, "")
146 Either::Right(comment) => {
147 (comment.text(), comment.syntax().text_range(), comment.prefix())
151 let mut pos = TextSize::from(prefix.len() as u32);
152 let mut range_start = range.start();
153 for line in line.split('\n') {
154 let line_len = TextSize::from(line.len() as u32);
155 let prev_range_start = {
156 let next_range_start = range_start + line_len + TextSize::from(1);
157 mem::replace(&mut range_start, next_range_start)
159 // only first line has the prefix so take it away for future iterations
160 let mut pos = mem::take(&mut pos);
162 match line.find(RUSTDOC_FENCE) {
164 is_codeblock = !is_codeblock;
165 // Check whether code is rust by inspecting fence guards
166 let guards = &line[idx + RUSTDOC_FENCE.len()..];
167 let is_rust = is_rust_fence(guards);
168 is_doctest = is_codeblock && is_rust;
171 None if !is_doctest => continue,
175 // whitespace after comment is ignored
176 if let Some(ws) = line[pos.into()..].chars().next().filter(|c| c.is_whitespace()) {
177 pos += TextSize::of(ws);
179 // lines marked with `#` should be ignored in output, we skip the `#` char
180 if line[pos.into()..].starts_with('#') {
181 pos += TextSize::of('#');
184 new_comments.push(TextRange::at(prev_range_start, pos));
185 inj.add(&line[pos.into()..], TextRange::new(pos, line_len) + prev_range_start);
186 inj.add_unmapped("\n");
190 if new_comments.is_empty() {
191 return; // no need to run an analysis on an empty file
194 inj.add_unmapped("\n}");
196 let (analysis, tmp_file_id) = Analysis::from_single_file(inj.text().to_string());
198 for HlRange { range, highlight, binding_hash } in
199 analysis.with_db(|db| super::highlight(db, tmp_file_id, None, true)).unwrap()
201 for range in inj.map_range_up(range) {
202 hl.add(HlRange { range, highlight: highlight | HlMod::Injected, binding_hash });
206 for range in new_comments {
209 highlight: HlTag::Comment | HlMod::Documentation,
215 fn find_doc_string_in_attr(attr: &hir::Attr, it: &ast::Attr) -> Option<ast::String> {
218 Some(ast::Expr::Literal(lit)) => match lit.kind() {
219 ast::LiteralKind::String(it) => Some(it),
222 // #[cfg_attr(..., doc = "", ...)]
224 // We gotta hunt the string token manually here
225 let text = attr.string_value()?;
226 // FIXME: We just pick the first string literal that has the same text as the doc attribute
227 // This means technically we might highlight the wrong one
229 .descendants_with_tokens()
230 .filter_map(NodeOrToken::into_token)
231 .filter_map(ast::String::cast)
233 string.text().get(1..string.text().len() - 1).map_or(false, |it| it == text)
240 fn module_def_to_hl_tag(def: Either<hir::ModuleDef, hir::MacroDef>) -> HlTag {
241 let symbol = match def {
242 Either::Left(def) => match def {
243 hir::ModuleDef::Module(_) => SymbolKind::Module,
244 hir::ModuleDef::Function(_) => SymbolKind::Function,
245 hir::ModuleDef::Adt(hir::Adt::Struct(_)) => SymbolKind::Struct,
246 hir::ModuleDef::Adt(hir::Adt::Enum(_)) => SymbolKind::Enum,
247 hir::ModuleDef::Adt(hir::Adt::Union(_)) => SymbolKind::Union,
248 hir::ModuleDef::Variant(_) => SymbolKind::Variant,
249 hir::ModuleDef::Const(_) => SymbolKind::Const,
250 hir::ModuleDef::Static(_) => SymbolKind::Static,
251 hir::ModuleDef::Trait(_) => SymbolKind::Trait,
252 hir::ModuleDef::TypeAlias(_) => SymbolKind::TypeAlias,
253 hir::ModuleDef::BuiltinType(_) => return HlTag::BuiltinType,
255 Either::Right(_) => SymbolKind::Macro,
257 HlTag::Symbol(symbol)