//! FIXME: write short doc here use rustc_hash::{FxHashMap, FxHashSet}; use hir::{Mutability, Name}; use ra_db::SourceDatabase; use ra_prof::profile; use ra_syntax::{ast, AstNode, Direction, SyntaxElement, SyntaxKind, SyntaxKind::*, TextRange, T}; use crate::{ db::RootDatabase, references::{ classify_name, classify_name_ref, NameKind::{self, *}, }, FileId, }; #[derive(Debug)] pub struct HighlightedRange { pub range: TextRange, pub tag: &'static str, pub binding_hash: Option, } fn is_control_keyword(kind: SyntaxKind) -> bool { match kind { T![for] | T![loop] | T![while] | T![continue] | T![break] | T![if] | T![else] | T![match] | T![return] => true, _ => false, } } pub(crate) fn highlight(db: &RootDatabase, file_id: FileId) -> Vec { let _p = profile("highlight"); let parse = db.parse(file_id); let root = parse.tree().syntax().clone(); fn calc_binding_hash(file_id: FileId, name: &Name, shadow_count: u32) -> u64 { fn hash(x: T) -> u64 { use std::{collections::hash_map::DefaultHasher, hash::Hasher}; let mut hasher = DefaultHasher::new(); x.hash(&mut hasher); hasher.finish() } hash((file_id, name, shadow_count)) } // Visited nodes to handle highlighting priorities // FIXME: retain only ranges here let mut highlighted: FxHashSet = FxHashSet::default(); let mut bindings_shadow_count: FxHashMap = FxHashMap::default(); let mut res = Vec::new(); for node in root.descendants_with_tokens() { if highlighted.contains(&node) { continue; } let mut binding_hash = None; let tag = match node.kind() { FN_DEF => { bindings_shadow_count.clear(); continue; } COMMENT => "comment", STRING | RAW_STRING | RAW_BYTE_STRING | BYTE_STRING => "string", ATTR => "attribute", NAME_REF => { if node.ancestors().any(|it| it.kind() == ATTR) { continue; } let name_ref = node.as_node().cloned().and_then(ast::NameRef::cast).unwrap(); let name_kind = classify_name_ref(db, file_id, &name_ref).map(|d| d.kind); if let Some(Local(local)) = &name_kind { if let Some(name) = local.name(db) { let shadow_count = bindings_shadow_count.entry(name.clone()).or_default(); binding_hash = Some(calc_binding_hash(file_id, &name, *shadow_count)) } }; name_kind.map_or("text", |it| highlight_name(db, it)) } NAME => { let name = node.as_node().cloned().and_then(ast::Name::cast).unwrap(); let name_kind = classify_name(db, file_id, &name).map(|d| d.kind); if let Some(Local(local)) = &name_kind { if let Some(name) = local.name(db) { let shadow_count = bindings_shadow_count.entry(name.clone()).or_default(); *shadow_count += 1; binding_hash = Some(calc_binding_hash(file_id, &name, *shadow_count)) } }; match name_kind { Some(name_kind) => highlight_name(db, name_kind), None => name.syntax().parent().map_or("function", |x| match x.kind() { TYPE_PARAM | STRUCT_DEF | ENUM_DEF | TRAIT_DEF | TYPE_ALIAS_DEF => "type", RECORD_FIELD_DEF => "field", _ => "function", }), } } INT_NUMBER | FLOAT_NUMBER | CHAR | BYTE => "literal", LIFETIME => "parameter", T![unsafe] => "keyword.unsafe", k if is_control_keyword(k) => "keyword.control", k if k.is_keyword() => "keyword", _ => { if let Some(macro_call) = node.as_node().cloned().and_then(ast::MacroCall::cast) { 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().clone().into()); let range_start = name_ref.syntax().text_range().start(); let mut range_end = name_ref.syntax().text_range().end(); for sibling in path.syntax().siblings_with_tokens(Direction::Next) { match sibling.kind() { T![!] | IDENT => range_end = sibling.text_range().end(), _ => (), } } res.push(HighlightedRange { range: TextRange::from_to(range_start, range_end), tag: "macro", binding_hash: None, }) } } } } continue; } }; res.push(HighlightedRange { range: node.text_range(), tag, binding_hash }) } res } pub(crate) fn highlight_as_html(db: &RootDatabase, file_id: FileId, rainbow: bool) -> String { let parse = db.parse(file_id); fn rainbowify(seed: u64) -> String { use rand::prelude::*; let mut rng = SmallRng::seed_from_u64(seed); format!( "hsl({h},{s}%,{l}%)", h = rng.gen_range::(0, 361), s = rng.gen_range::(42, 99), l = rng.gen_range::(40, 91), ) } let mut ranges = highlight(db, file_id); ranges.sort_by_key(|it| it.range.start()); // quick non-optimal heuristic to intersect token ranges and highlighted ranges let mut frontier = 0; let mut could_intersect: Vec<&HighlightedRange> = Vec::new(); let mut buf = String::new(); buf.push_str(&STYLE); buf.push_str("
");
    let tokens = parse.tree().syntax().descendants_with_tokens().filter_map(|it| it.into_token());
    for token in tokens {
        could_intersect.retain(|it| token.text_range().start() <= it.range.end());
        while let Some(r) = ranges.get(frontier) {
            if r.range.start() <= token.text_range().end() {
                could_intersect.push(r);
                frontier += 1;
            } else {
                break;
            }
        }
        let text = html_escape(&token.text());
        let ranges = could_intersect
            .iter()
            .filter(|it| token.text_range().is_subrange(&it.range))
            .collect::>();
        if ranges.is_empty() {
            buf.push_str(&text);
        } else {
            let classes = ranges.iter().map(|x| x.tag).collect::>().join(" ");
            let binding_hash = ranges.first().and_then(|x| x.binding_hash);
            let color = match (rainbow, binding_hash) {
                (true, Some(hash)) => format!(
                    " data-binding-hash=\"{}\" style=\"color: {};\"",
                    hash,
                    rainbowify(hash)
                ),
                _ => "".into(),
            };
            buf.push_str(&format!("{}", classes, color, text));
        }
    }
    buf.push_str("
"); buf } fn highlight_name(db: &RootDatabase, name_kind: NameKind) -> &'static str { match name_kind { Macro(_) => "macro", Field(_) => "field", AssocItem(hir::AssocItem::Function(_)) => "function", AssocItem(hir::AssocItem::Const(_)) => "constant", AssocItem(hir::AssocItem::TypeAlias(_)) => "type", Def(hir::ModuleDef::Module(_)) => "module", Def(hir::ModuleDef::Function(_)) => "function", Def(hir::ModuleDef::Adt(_)) => "type", Def(hir::ModuleDef::EnumVariant(_)) => "constant", Def(hir::ModuleDef::Const(_)) => "constant", Def(hir::ModuleDef::Static(_)) => "constant", Def(hir::ModuleDef::Trait(_)) => "type", Def(hir::ModuleDef::TypeAlias(_)) => "type", Def(hir::ModuleDef::BuiltinType(_)) => "type", SelfType(_) => "type", GenericParam(_) => "type", Local(local) => { if local.is_mut(db) { "variable.mut" } else { match local.ty(db).as_reference() { Some((_, Mutability::Mut)) => "variable.mut", _ => "variable", } } } } } //FIXME: like, real html escaping fn html_escape(text: &str) -> String { text.replace("<", "<").replace(">", ">") } const STYLE: &str = " "; #[cfg(test)] mod tests { use crate::mock_analysis::single_file; use test_utils::{assert_eq_text, project_dir, read_text}; #[test] fn test_highlighting() { let (analysis, file_id) = single_file( r#" #[derive(Clone, Debug)] struct Foo { pub x: i32, pub y: i32, } fn foo() -> T { unimplemented!(); foo::(); } // comment fn main() { println!("Hello, {}!", 92); let mut vec = Vec::new(); if true { vec.push(Foo { x: 0, y: 1 }); } unsafe { vec.set_len(0); } let mut x = 42; let y = &mut x; let z = &y; y; } "# .trim(), ); let dst_file = project_dir().join("crates/ra_ide_api/src/snapshots/highlighting.html"); let actual_html = &analysis.highlight_as_html(file_id, false).unwrap(); let expected_html = &read_text(&dst_file); std::fs::write(dst_file, &actual_html).unwrap(); assert_eq_text!(expected_html, actual_html); } #[test] fn test_rainbow_highlighting() { let (analysis, file_id) = single_file( r#" fn main() { let hello = "hello"; let x = hello.to_string(); let y = hello.to_string(); let x = "other color please!"; let y = x.to_string(); } fn bar() { let mut hello = "hello"; } "# .trim(), ); let dst_file = project_dir().join("crates/ra_ide_api/src/snapshots/rainbow_highlighting.html"); let actual_html = &analysis.highlight_as_html(file_id, true).unwrap(); let expected_html = &read_text(&dst_file); std::fs::write(dst_file, &actual_html).unwrap(); assert_eq_text!(expected_html, actual_html); } }