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|
//! This crate provides those IDE features which use only a single file.
//!
//! This usually means functions which take syntax tree as an input and produce
//! an edit or some auxiliary info.
mod extend_selection;
mod folding_ranges;
mod line_index;
mod line_index_utils;
mod structure;
#[cfg(test)]
mod test_utils;
mod join_lines;
mod typing;
mod diagnostics;
#[derive(Debug)]
pub struct LocalEdit {
pub label: String,
pub edit: ra_text_edit::TextEdit,
pub cursor_position: Option<TextUnit>,
}
pub use self::{
extend_selection::extend_selection,
folding_ranges::{folding_ranges, Fold, FoldKind},
line_index::{LineCol, LineIndex},
line_index_utils::translate_offset_with_edit,
structure::{file_structure, StructureNode},
diagnostics::diagnostics,
join_lines::join_lines,
typing::{on_enter, on_dot_typed, on_eq_typed},
};
use ra_text_edit::TextEditBuilder;
use ra_syntax::{
SourceFile, SyntaxNode, TextRange, TextUnit, Direction,
SyntaxKind::{self, *},
ast::{self, AstNode},
algo::find_leaf_at_offset,
};
use rustc_hash::FxHashSet;
#[derive(Debug)]
pub struct HighlightedRange {
pub range: TextRange,
pub tag: &'static str,
}
#[derive(Debug, Copy, Clone)]
pub enum Severity {
Error,
WeakWarning,
}
#[derive(Debug)]
pub struct Diagnostic {
pub range: TextRange,
pub msg: String,
pub severity: Severity,
pub fix: Option<LocalEdit>,
}
pub fn matching_brace(file: &SourceFile, offset: TextUnit) -> Option<TextUnit> {
const BRACES: &[SyntaxKind] =
&[L_CURLY, R_CURLY, L_BRACK, R_BRACK, L_PAREN, R_PAREN, L_ANGLE, R_ANGLE];
let (brace_node, brace_idx) = find_leaf_at_offset(file.syntax(), offset)
.filter_map(|node| {
let idx = BRACES.iter().position(|&brace| brace == node.kind())?;
Some((node, idx))
})
.next()?;
let parent = brace_node.parent()?;
let matching_kind = BRACES[brace_idx ^ 1];
let matching_node = parent.children().find(|node| node.kind() == matching_kind)?;
Some(matching_node.range().start())
}
pub fn highlight(root: &SyntaxNode) -> Vec<HighlightedRange> {
// Visited nodes to handle highlighting priorities
let mut highlighted = FxHashSet::default();
let mut res = Vec::new();
for node in root.descendants() {
if highlighted.contains(&node) {
continue;
}
let tag = match node.kind() {
COMMENT => "comment",
STRING | RAW_STRING | RAW_BYTE_STRING | BYTE_STRING => "string",
ATTR => "attribute",
NAME_REF => "text",
NAME => "function",
INT_NUMBER | FLOAT_NUMBER | CHAR | BYTE => "literal",
LIFETIME => "parameter",
k if k.is_keyword() => "keyword",
_ => {
if let Some(macro_call) = ast::MacroCall::cast(node) {
if let Some(path) = macro_call.path() {
if let Some(segment) = path.segment() {
if let Some(name_ref) = segment.name_ref() {
highlighted.insert(name_ref.syntax());
let range_start = name_ref.syntax().range().start();
let mut range_end = name_ref.syntax().range().end();
for sibling in path.syntax().siblings(Direction::Next) {
match sibling.kind() {
EXCL | IDENT => range_end = sibling.range().end(),
_ => (),
}
}
res.push(HighlightedRange {
range: TextRange::from_to(range_start, range_end),
tag: "macro",
})
}
}
}
}
continue;
}
};
res.push(HighlightedRange { range: node.range(), tag })
}
res
}
pub fn syntax_tree(file: &SourceFile) -> String {
::ra_syntax::utils::dump_tree(file.syntax())
}
#[cfg(test)]
mod tests {
use ra_syntax::AstNode;
use insta::assert_debug_snapshot_matches;
use crate::test_utils::{add_cursor, assert_eq_text, extract_offset};
use super::*;
#[test]
fn test_highlighting() {
let file = SourceFile::parse(
r#"
// comment
fn main() {}
println!("Hello, {}!", 92);
"#,
);
let hls = highlight(file.syntax());
assert_debug_snapshot_matches!("highlighting", hls);
}
#[test]
fn test_matching_brace() {
fn do_check(before: &str, after: &str) {
let (pos, before) = extract_offset(before);
let file = SourceFile::parse(&before);
let new_pos = match matching_brace(&file, pos) {
None => pos,
Some(pos) => pos,
};
let actual = add_cursor(&before, new_pos);
assert_eq_text!(after, &actual);
}
do_check("struct Foo { a: i32, }<|>", "struct Foo <|>{ a: i32, }");
}
}
|
