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//! Syntax highlighting injections such as highlighting of documentation tests.
use std::convert::TryFrom;
use hir::Semantics;
use ide_db::call_info::ActiveParameter;
use itertools::Itertools;
use syntax::{ast, AstToken, SyntaxNode, SyntaxToken, TextRange, TextSize};
use crate::{Analysis, HlMod, HlRange, HlTag, RootDatabase};
use super::{highlights::Highlights, injector::Injector};
pub(super) fn highlight_injection(
hl: &mut Highlights,
sema: &Semantics<RootDatabase>,
literal: ast::String,
expanded: SyntaxToken,
) -> Option<()> {
let active_parameter = ActiveParameter::at_token(&sema, expanded)?;
if !active_parameter.name.starts_with("ra_fixture") {
return None;
}
let value = literal.value()?;
if let Some(range) = literal.open_quote_text_range() {
hl.add(HlRange { range, highlight: HlTag::StringLiteral.into(), binding_hash: None })
}
let mut inj = Injector::default();
let mut text = &*value;
let mut offset: TextSize = 0.into();
while !text.is_empty() {
let marker = "$0";
let idx = text.find(marker).unwrap_or(text.len());
let (chunk, next) = text.split_at(idx);
inj.add(chunk, TextRange::at(offset, TextSize::of(chunk)));
text = next;
offset += TextSize::of(chunk);
if let Some(next) = text.strip_prefix(marker) {
if let Some(range) = literal.map_range_up(TextRange::at(offset, TextSize::of(marker))) {
hl.add(HlRange { range, highlight: HlTag::Keyword.into(), binding_hash: None });
}
text = next;
let marker_len = TextSize::of(marker);
offset += marker_len;
}
}
let (analysis, tmp_file_id) = Analysis::from_single_file(inj.text().to_string());
for mut hl_range in analysis.highlight(tmp_file_id).unwrap() {
for range in inj.map_range_up(hl_range.range) {
if let Some(range) = literal.map_range_up(range) {
hl_range.range = range;
hl.add(hl_range.clone());
}
}
}
if let Some(range) = literal.close_quote_text_range() {
hl.add(HlRange { range, highlight: HlTag::StringLiteral.into(), binding_hash: None })
}
Some(())
}
const RUSTDOC_FENCE: &'static str = "```";
const RUSTDOC_FENCE_TOKENS: &[&'static str] = &[
"",
"rust",
"should_panic",
"ignore",
"no_run",
"compile_fail",
"edition2015",
"edition2018",
"edition2021",
];
/// Extracts Rust code from documentation comments as well as a mapping from
/// the extracted source code back to the original source ranges.
/// Lastly, a vector of new comment highlight ranges (spanning only the
/// comment prefix) is returned which is used in the syntax highlighting
/// injection to replace the previous (line-spanning) comment ranges.
pub(super) fn extract_doc_comments(node: &SyntaxNode) -> Option<(Vec<HlRange>, Injector)> {
let mut inj = Injector::default();
// wrap the doctest into function body to get correct syntax highlighting
let prefix = "fn doctest() {\n";
let suffix = "}\n";
let mut line_start = TextSize::of(prefix);
let mut is_codeblock = false;
let mut is_doctest = false;
// Replace the original, line-spanning comment ranges by new, only comment-prefix
// spanning comment ranges.
let mut new_comments = Vec::new();
inj.add_unmapped(prefix);
let doctest = node
.children_with_tokens()
.filter_map(|el| el.into_token().and_then(ast::Comment::cast))
.filter(|comment| comment.kind().doc.is_some())
.filter(|comment| {
if let Some(idx) = comment.text().find(RUSTDOC_FENCE) {
is_codeblock = !is_codeblock;
// Check whether code is rust by inspecting fence guards
let guards = &comment.text()[idx + RUSTDOC_FENCE.len()..];
let is_rust =
guards.split(',').all(|sub| RUSTDOC_FENCE_TOKENS.contains(&sub.trim()));
is_doctest = is_codeblock && is_rust;
false
} else {
is_doctest
}
})
.map(|comment| {
let prefix_len = comment.prefix().len();
let line: &str = comment.text().as_str();
let range = comment.syntax().text_range();
// whitespace after comment is ignored
let pos = if let Some(ws) = line.chars().nth(prefix_len).filter(|c| c.is_whitespace()) {
prefix_len + ws.len_utf8()
} else {
prefix_len
};
// lines marked with `#` should be ignored in output, we skip the `#` char
let pos = if let Some(ws) = line.chars().nth(pos).filter(|&c| c == '#') {
pos + ws.len_utf8()
} else {
pos
};
new_comments.push(HlRange {
range: TextRange::new(
range.start(),
range.start() + TextSize::try_from(pos).unwrap(),
),
highlight: HlTag::Comment | HlMod::Documentation,
binding_hash: None,
});
line_start += range.len() - TextSize::try_from(pos).unwrap();
line_start += TextSize::of("\n");
inj.add(
&line[pos..],
TextRange::new(range.start() + TextSize::try_from(pos).unwrap(), range.end()),
);
inj.add_unmapped("\n");
line[pos..].to_owned()
})
.join("\n");
inj.add_unmapped(suffix);
if doctest.is_empty() {
return None;
}
Some((new_comments, inj))
}
/// Injection of syntax highlighting of doctests.
pub(super) fn highlight_doc_comment(
new_comments: Vec<HlRange>,
inj: Injector,
stack: &mut Highlights,
) {
let (analysis, tmp_file_id) = Analysis::from_single_file(inj.text().to_string());
for comment in new_comments {
stack.add(comment);
}
for h in analysis.with_db(|db| super::highlight(db, tmp_file_id, None, true)).unwrap() {
for r in inj.map_range_up(h.range) {
stack.add(HlRange {
range: r,
highlight: h.highlight | HlMod::Injected,
binding_hash: h.binding_hash,
});
}
}
}
|
