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|
//! Syntax highlighting injections such as highlighting of documentation tests.
use std::{collections::BTreeMap, convert::TryFrom};
use ast::{HasQuotes, HasStringValue};
use hir::Semantics;
use itertools::Itertools;
use syntax::{ast, AstToken, SyntaxNode, SyntaxToken, TextRange, TextSize};
use crate::{
call_info::ActiveParameter, Analysis, Highlight, HighlightModifier, HighlightTag,
HighlightedRange, RootDatabase,
};
use super::HighlightedRangeStack;
pub(super) fn highlight_injection(
acc: &mut HighlightedRangeStack,
sema: &Semantics<RootDatabase>,
literal: ast::RawString,
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()?;
let (analysis, tmp_file_id) = Analysis::from_single_file(value.into_owned());
if let Some(range) = literal.open_quote_text_range() {
acc.add(HighlightedRange {
range,
highlight: HighlightTag::StringLiteral.into(),
binding_hash: None,
})
}
for mut h in analysis.highlight(tmp_file_id).unwrap() {
if let Some(r) = literal.map_range_up(h.range) {
h.range = r;
acc.add(h)
}
}
if let Some(range) = literal.close_quote_text_range() {
acc.add(HighlightedRange {
range,
highlight: HighlightTag::StringLiteral.into(),
binding_hash: None,
})
}
Some(())
}
/// Mapping from extracted documentation code to original code
type RangesMap = BTreeMap<TextSize, TextSize>;
const RUSTDOC_FENCE: &'static str = "```";
const RUSTDOC_FENCE_TOKENS: &[&'static str] =
&["", "rust", "should_panic", "ignore", "no_run", "compile_fail", "edition2015", "edition2018"];
/// 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<(String, RangesMap, Vec<HighlightedRange>)> {
// wrap the doctest into function body to get correct syntax highlighting
let prefix = "fn doctest() {\n";
let suffix = "}\n";
// Mapping from extracted documentation code to original code
let mut range_mapping: RangesMap = BTreeMap::new();
let mut line_start = TextSize::try_from(prefix.len()).unwrap();
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();
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
};
range_mapping.insert(line_start, range.start() + TextSize::try_from(pos).unwrap());
new_comments.push(HighlightedRange {
range: TextRange::new(
range.start(),
range.start() + TextSize::try_from(pos).unwrap(),
),
highlight: HighlightTag::Comment | HighlightModifier::Documentation,
binding_hash: None,
});
line_start += range.len() - TextSize::try_from(pos).unwrap();
line_start += TextSize::try_from('\n'.len_utf8()).unwrap();
line[pos..].to_owned()
})
.join("\n");
if doctest.is_empty() {
return None;
}
let doctest = format!("{}{}{}", prefix, doctest, suffix);
Some((doctest, range_mapping, new_comments))
}
/// Injection of syntax highlighting of doctests.
pub(super) fn highlight_doc_comment(
text: String,
range_mapping: RangesMap,
new_comments: Vec<HighlightedRange>,
stack: &mut HighlightedRangeStack,
) {
let (analysis, tmp_file_id) = Analysis::from_single_file(text);
stack.push();
for mut h in analysis.with_db(|db| super::highlight(db, tmp_file_id, None, true)).unwrap() {
// Determine start offset and end offset in case of multi-line ranges
let mut start_offset = None;
let mut end_offset = None;
for (line_start, orig_line_start) in range_mapping.range(..h.range.end()).rev() {
// It's possible for orig_line_start - line_start to be negative. Add h.range.start()
// here and remove it from the end range after the loop below so that the values are
// always non-negative.
let offset = h.range.start() + orig_line_start - line_start;
if line_start <= &h.range.start() {
start_offset.get_or_insert(offset);
break;
} else {
end_offset.get_or_insert(offset);
}
}
if let Some(start_offset) = start_offset {
h.range = TextRange::new(
start_offset,
h.range.end() + end_offset.unwrap_or(start_offset) - h.range.start(),
);
h.highlight |= HighlightModifier::Injected;
stack.add(h);
}
}
// Inject the comment prefix highlight ranges
stack.push();
for comment in new_comments {
stack.add(comment);
}
stack.pop_and_inject(None);
stack
.pop_and_inject(Some(Highlight::from(HighlightTag::Generic) | HighlightModifier::Injected));
}
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