rust/crates/ra_ide/src/syntax_highlighting.rs
2019-11-28 12:50:26 +03:00

342 lines
11 KiB
Rust

//! FIXME: write short doc here
use rustc_hash::{FxHashMap, FxHashSet};
use hir::{InFile, 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<u64>,
}
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<HighlightedRange> {
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<T: std::hash::Hash + std::fmt::Debug>(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<SyntaxElement> = FxHashSet::default();
let mut bindings_shadow_count: FxHashMap<Name, u32> = 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, InFile::new(file_id.into(), &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, InFile::new(file_id.into(), &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::<u16, _, _>(0, 361),
s = rng.gen_range::<u16, _, _>(42, 99),
l = rng.gen_range::<u16, _, _>(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("<pre><code>");
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::<Vec<_>>();
if ranges.is_empty() {
buf.push_str(&text);
} else {
let classes = ranges.iter().map(|x| x.tag).collect::<Vec<_>>().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!("<span class=\"{}\"{}>{}</span>", classes, color, text));
}
}
buf.push_str("</code></pre>");
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 if local.ty(db).is_mutable_reference() {
"variable.mut"
} else {
"variable"
}
}
}
}
//FIXME: like, real html escaping
fn html_escape(text: &str) -> String {
text.replace("<", "&lt;").replace(">", "&gt;")
}
const STYLE: &str = "
<style>
body { margin: 0; }
pre { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
.comment { color: #7F9F7F; }
.string { color: #CC9393; }
.function { color: #93E0E3; }
.parameter { color: #94BFF3; }
.builtin { color: #DD6718; }
.text { color: #DCDCCC; }
.attribute { color: #94BFF3; }
.literal { color: #BFEBBF; }
.macro { color: #94BFF3; }
.variable { color: #DCDCCC; }
.variable\\.mut { color: #DCDCCC; text-decoration: underline; }
.keyword { color: #F0DFAF; }
.keyword\\.unsafe { color: #DFAF8F; }
.keyword\\.control { color: #F0DFAF; font-weight: bold; }
</style>
";
#[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>() -> T {
unimplemented!();
foo::<i32>();
}
// 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/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/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);
}
}