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|
use ra_syntax::{ast, AstNode, SourceFileNode, TextRange};
use ra_editor::HighlightedRange;
use ra_db::SyntaxDatabase;
use crate::{
db::RootDatabase,
FileId, Cancelable,
};
pub(crate) fn highlight(db: &RootDatabase, file_id: FileId) -> Cancelable<Vec<HighlightedRange>> {
let source_file = db.source_file(file_id);
let mut res = ra_editor::highlight(&source_file);
for macro_call in source_file
.syntax()
.descendants()
.filter_map(ast::MacroCall::cast)
{
if let Some(exp) = expand(db, file_id, macro_call) {
let mapped_ranges = ra_editor::highlight(exp.source_file())
.into_iter()
.filter_map(|r| {
let mapped_range = exp.map_range_back(r.range)?;
let res = HighlightedRange {
range: mapped_range,
tag: r.tag,
};
Some(res)
});
res.extend(mapped_ranges);
}
}
Ok(res)
}
fn expand(
_db: &RootDatabase,
_file_id: FileId,
macro_call: ast::MacroCall,
) -> Option<MacroExpansion> {
let path = macro_call.path()?;
if path.qualifier().is_some() {
return None;
}
let name_ref = path.segment()?.name_ref()?;
if name_ref.text() != "ctry" {
return None;
}
let arg = macro_call.token_tree()?;
let text = format!(
r"
fn dummy() {{
match {} {{
None => return Ok(None),
Some(it) => it,
}}
}}",
arg.syntax().text()
);
let file = SourceFileNode::parse(&text);
let match_expr = file.syntax().descendants().find_map(ast::MatchExpr::cast)?;
let match_arg = match_expr.expr()?;
let ranges_map = vec![(arg.syntax().range(), match_arg.syntax().range())];
let res = MacroExpansion {
source_file: file,
ranges_map,
};
Some(res)
}
struct MacroExpansion {
source_file: SourceFileNode,
ranges_map: Vec<(TextRange, TextRange)>,
}
impl MacroExpansion {
fn source_file(&self) -> &SourceFileNode {
&self.source_file
}
fn map_range_back(&self, tgt_range: TextRange) -> Option<TextRange> {
for (s_range, t_range) in self.ranges_map.iter() {
if tgt_range.is_subrange(&t_range) {
let tgt_at_zero_range = tgt_range - tgt_range.start();
let tgt_range_offset = tgt_range.start() - t_range.start();
let src_range = tgt_at_zero_range + tgt_range_offset + s_range.start();
return Some(src_range);
}
}
None
}
}
#[cfg(test)]
mod tests {
use crate::mock_analysis::single_file;
use test_utils::assert_eq_dbg;
#[test]
fn highlights_code_inside_macros() {
let (analysis, file_id) = single_file(
"
fn main() {
ctry!({ let x = 92; x});
}
",
);
let highlights = analysis.highlight(file_id).unwrap();
assert_eq_dbg(
r#"[HighlightedRange { range: [13; 15), tag: "keyword" },
HighlightedRange { range: [16; 20), tag: "function" },
HighlightedRange { range: [41; 46), tag: "macro" },
HighlightedRange { range: [49; 52), tag: "keyword" },
HighlightedRange { range: [57; 59), tag: "literal" },
HighlightedRange { range: [49; 52), tag: "keyword" },
HighlightedRange { range: [53; 54), tag: "function" },
HighlightedRange { range: [57; 59), tag: "literal" },
HighlightedRange { range: [61; 62), tag: "text" }]"#,
&highlights,
)
}
}
|
