9 files changed, 3 insertions, 359 deletions

diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 3c8f55f1e..602423919 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -16,7 +16,6 @@ use serde::Deserialize;
 #[derive(Debug, Clone)]
 pub struct Config {
     pub client_caps: ClientCapsConfig,
-    pub publish_decorations: bool,
     pub publish_diagnostics: bool,
     pub notifications: NotificationsConfig,
     pub inlay_hints: InlayHintsConfig,
@@ -60,7 +59,6 @@ pub struct ClientCapsConfig {
 impl Default for Config {
     fn default() -> Self {
         Config {
-            publish_decorations: false,
             publish_diagnostics: true,
             notifications: NotificationsConfig {
                 workspace_loaded: true,
@@ -105,7 +103,6 @@ impl Config {
         *self = Default::default();
         self.client_caps = client_caps;
 
-        set(value, "/publishDecorations", &mut self.publish_decorations);
         set(value, "/excludeGlobs", &mut self.exclude_globs);
         set(value, "/useClientWatching", &mut self.use_client_watching);
         set(value, "/lruCapacity", &mut self.lru_capacity);
diff --git a/crates/rust-analyzer/src/main_loop.rs b/crates/rust-analyzer/src/main_loop.rs
index 45ae0ad9d..47fef59d4 100644
--- a/crates/rust-analyzer/src/main_loop.rs
+++ b/crates/rust-analyzer/src/main_loop.rs
@@ -250,9 +250,7 @@ impl fmt::Debug for Event {
                 }
             }
             Event::Task(Task::Notify(not)) => {
-                if notification_is::<req::PublishDecorations>(not)
-                    || notification_is::<req::PublishDiagnostics>(not)
-                {
+                if notification_is::<req::PublishDiagnostics>(not) {
                     return debug_verbose_not(not, f);
                 }
             }
@@ -427,7 +425,6 @@ fn loop_turn(
         update_file_notifications_on_threadpool(
             pool,
             world_state.snapshot(),
-            world_state.config.publish_decorations,
             task_sender.clone(),
             loop_state.subscriptions.subscriptions(),
         )
@@ -508,7 +505,6 @@ fn on_request(
         .on::<req::GotoTypeDefinition>(handlers::handle_goto_type_definition)?
         .on::<req::ParentModule>(handlers::handle_parent_module)?
         .on::<req::Runnables>(handlers::handle_runnables)?
-        .on::<req::DecorationsRequest>(handlers::handle_decorations)?
         .on::<req::Completion>(handlers::handle_completion)?
         .on::<req::CodeActionRequest>(handlers::handle_code_action)?
         .on::<req::CodeLensRequest>(handlers::handle_code_lens)?
@@ -884,7 +880,6 @@ where
 fn update_file_notifications_on_threadpool(
     pool: &ThreadPool,
     world: WorldSnapshot,
-    publish_decorations: bool,
     task_sender: Sender<Task>,
     subscriptions: Vec<FileId>,
 ) {
@@ -904,19 +899,6 @@ fn update_file_notifications_on_threadpool(
                     }
                 }
             }
-            if publish_decorations {
-                match handlers::publish_decorations(&world, file_id) {
-                    Err(e) => {
-                        if !is_canceled(&e) {
-                            log::error!("failed to compute decorations: {:?}", e);
-                        }
-                    }
-                    Ok(params) => {
-                        let not = notification_new::<req::PublishDecorations>(params);
-                        task_sender.send(Task::Notify(not)).unwrap();
-                    }
-                }
-            }
         }
     });
 }
diff --git a/crates/rust-analyzer/src/main_loop/handlers.rs b/crates/rust-analyzer/src/main_loop/handlers.rs
index 23e48c089..db620dca3 100644
--- a/crates/rust-analyzer/src/main_loop/handlers.rs
+++ b/crates/rust-analyzer/src/main_loop/handlers.rs
@@ -38,7 +38,7 @@ use crate::{
     },
     diagnostics::DiagnosticTask,
     from_json,
-    req::{self, Decoration, InlayHint, InlayHintsParams},
+    req::{self, InlayHint, InlayHintsParams},
     semantic_tokens::SemanticTokensBuilder,
     world::WorldSnapshot,
     LspError, Result,
@@ -389,15 +389,6 @@ pub fn handle_runnables(
     Ok(res)
 }
 
-pub fn handle_decorations(
-    world: WorldSnapshot,
-    params: TextDocumentIdentifier,
-) -> Result<Vec<Decoration>> {
-    let _p = profile("handle_decorations");
-    let file_id = params.try_conv_with(&world)?;
-    highlight(&world, file_id)
-}
-
 pub fn handle_completion(
     world: WorldSnapshot,
     params: req::CompletionParams,
@@ -970,15 +961,6 @@ pub fn publish_diagnostics(world: &WorldSnapshot, file_id: FileId) -> Result<Dia
     Ok(DiagnosticTask::SetNative(file_id, diagnostics))
 }
 
-pub fn publish_decorations(
-    world: &WorldSnapshot,
-    file_id: FileId,
-) -> Result<req::PublishDecorationsParams> {
-    let _p = profile("publish_decorations");
-    let uri = world.file_id_to_uri(file_id)?;
-    Ok(req::PublishDecorationsParams { uri, decorations: highlight(&world, file_id)? })
-}
-
 fn to_lsp_runnable(
     world: &WorldSnapshot,
     file_id: FileId,
@@ -1008,21 +990,6 @@ fn to_lsp_runnable(
     })
 }
 
-fn highlight(world: &WorldSnapshot, file_id: FileId) -> Result<Vec<Decoration>> {
-    let line_index = world.analysis().file_line_index(file_id)?;
-    let res = world
-        .analysis()
-        .highlight(file_id)?
-        .into_iter()
-        .map(|h| Decoration {
-            range: h.range.conv_with(&line_index),
-            tag: h.highlight.to_string(),
-            binding_hash: h.binding_hash.map(|x| x.to_string()),
-        })
-        .collect();
-    Ok(res)
-}
-
 pub fn handle_inlay_hints(
     world: WorldSnapshot,
     params: InlayHintsParams,
diff --git a/crates/rust-analyzer/src/req.rs b/crates/rust-analyzer/src/req.rs
index 994f0ed61..ce799a683 100644
--- a/crates/rust-analyzer/src/req.rs
+++ b/crates/rust-analyzer/src/req.rs
@@ -1,6 +1,6 @@
 //! Defines `rust-analyzer` specific custom messages.
 
-use lsp_types::{Location, Position, Range, TextDocumentIdentifier, Url};
+use lsp_types::{Location, Position, Range, TextDocumentIdentifier};
 use rustc_hash::FxHashMap;
 use serde::{Deserialize, Serialize};
 
@@ -86,36 +86,6 @@ pub struct FindMatchingBraceParams {
     pub offsets: Vec<Position>,
 }
 
-pub enum DecorationsRequest {}
-
-impl Request for DecorationsRequest {
-    type Params = TextDocumentIdentifier;
-    type Result = Vec<Decoration>;
-    const METHOD: &'static str = "rust-analyzer/decorationsRequest";
-}
-
-pub enum PublishDecorations {}
-
-impl Notification for PublishDecorations {
-    type Params = PublishDecorationsParams;
-    const METHOD: &'static str = "rust-analyzer/publishDecorations";
-}
-
-#[derive(Deserialize, Serialize, Debug)]
-#[serde(rename_all = "camelCase")]
-pub struct PublishDecorationsParams {
-    pub uri: Url,
-    pub decorations: Vec<Decoration>,
-}
-
-#[derive(Deserialize, Serialize, Debug)]
-#[serde(rename_all = "camelCase")]
-pub struct Decoration {
-    pub range: Range,
-    pub tag: String,
-    pub binding_hash: Option<String>,
-}
-
 pub enum ParentModule {}
 
 impl Request for ParentModule {
diff --git a/editors/code/package.json b/editors/code/package.json
index 1d90e4298..946145df8 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -182,16 +182,6 @@
                     "default": false,
                     "description": "Use proposed semantic tokens API for syntax highlighting"
                 },
-                "rust-analyzer.highlightingOn": {
-                    "type": "boolean",
-                    "default": false,
-                    "description": "Highlight Rust code (overrides built-in syntax highlighting)"
-                },
-                "rust-analyzer.rainbowHighlightingOn": {
-                    "type": "boolean",
-                    "default": false,
-                    "description": "When highlighting Rust code, use a unique color per identifier"
-                },
                 "rust-analyzer.featureFlags": {
                     "type": "object",
                     "default": {},
diff --git a/editors/code/src/client.ts b/editors/code/src/client.ts
index f909f8db2..8ddc1cdca 100644
--- a/editors/code/src/client.ts
+++ b/editors/code/src/client.ts
@@ -7,7 +7,6 @@ import { SemanticTokensFeature, DocumentSemanticsTokensSignature } from 'vscode-
 
 export function configToServerOptions(config: Config) {
     return {
-        publishDecorations: !config.highlightingSemanticTokens,
         lruCapacity: config.lruCapacity,
 
         inlayHintsType: config.inlayHints.typeHints,
diff --git a/editors/code/src/config.ts b/editors/code/src/config.ts
index 501997fef..c37c6276b 100644
--- a/editors/code/src/config.ts
+++ b/editors/code/src/config.ts
@@ -71,8 +71,6 @@ export class Config {
     get channel() { return this.cfg.get<UpdatesChannel>("updates.channel")!; }
     get askBeforeDownload() { return this.cfg.get<boolean>("updates.askBeforeDownload")!; }
     get highlightingSemanticTokens() { return this.cfg.get<boolean>("highlighting.semanticTokens")!; }
-    get highlightingOn() { return this.cfg.get<boolean>("highlightingOn")!; }
-    get rainbowHighlightingOn() { return this.cfg.get<boolean>("rainbowHighlightingOn")!; }
     get lruCapacity() { return this.cfg.get<null | number>("lruCapacity")!; }
     get excludeGlobs() { return this.cfg.get<string[]>("excludeGlobs")!; }
     get useClientWatching() { return this.cfg.get<boolean>("useClientWatching")!; }
diff --git a/editors/code/src/highlighting.ts b/editors/code/src/highlighting.ts
deleted file mode 100644
index ea2dfc0e3..000000000
--- a/editors/code/src/highlighting.ts
+++ /dev/null
@@ -1,255 +0,0 @@
-import * as vscode from 'vscode';
-import * as ra from './rust-analyzer-api';
-
-import { ColorTheme, TextMateRuleSettings } from './color_theme';
-
-import { Ctx } from './ctx';
-import { sendRequestWithRetry, isRustDocument } from './util';
-
-export function activateHighlighting(ctx: Ctx) {
-    const highlighter = new Highlighter(ctx);
-
-    ctx.client.onNotification(ra.publishDecorations, params => {
-        if (!ctx.config.highlightingOn) return;
-
-        const targetEditor = vscode.window.visibleTextEditors.find(
-            editor => {
-                const unescapedUri = unescape(
-                    editor.document.uri.toString(),
-                );
-                // Unescaped URI looks like:
-                // file:///c:/Workspace/ra-test/src/main.rs
-                return unescapedUri === params.uri;
-            },
-        );
-        if (!targetEditor) return;
-
-        highlighter.setHighlights(targetEditor, params.decorations);
-    });
-
-
-    vscode.workspace.onDidChangeConfiguration(
-        _ => highlighter.removeHighlights(),
-        null,
-        ctx.subscriptions,
-    );
-
-    vscode.window.onDidChangeActiveTextEditor(
-        async (editor: vscode.TextEditor | undefined) => {
-            if (!editor || !isRustDocument(editor.document)) return;
-            if (!ctx.config.highlightingOn) return;
-            const client = ctx.client;
-            if (!client) return;
-
-            const decorations = await sendRequestWithRetry(
-                client,
-                ra.decorationsRequest,
-                { uri: editor.document.uri.toString() },
-            );
-            highlighter.setHighlights(editor, decorations);
-        },
-        null,
-        ctx.subscriptions,
-    );
-}
-
-// Based on this HSL-based color generator: https://gist.github.com/bendc/76c48ce53299e6078a76
-function fancify(seed: string, shade: 'light' | 'dark') {
-    const random = randomU32Numbers(hashString(seed));
-    const randomInt = (min: number, max: number) => {
-        return Math.abs(random()) % (max - min + 1) + min;
-    };
-
-    const h = randomInt(0, 360);
-    const s = randomInt(42, 98);
-    const l = shade === 'light' ? randomInt(15, 40) : randomInt(40, 90);
-    return `hsl(${h},${s}%,${l}%)`;
-}
-
-class Highlighter {
-    private ctx: Ctx;
-    private decorations: Map<
-        string,
-        vscode.TextEditorDecorationType
-    > | null = null;
-
-    constructor(ctx: Ctx) {
-        this.ctx = ctx;
-    }
-
-    public removeHighlights() {
-        if (this.decorations == null) {
-            return;
-        }
-
-        // Decorations are removed when the object is disposed
-        for (const decoration of this.decorations.values()) {
-            decoration.dispose();
-        }
-
-        this.decorations = null;
-    }
-
-    public setHighlights(editor: vscode.TextEditor, highlights: ra.Decoration[]) {
-        const client = this.ctx.client;
-        if (!client) return;
-        // Initialize decorations if necessary
-        //
-        // Note: decoration objects need to be kept around so we can dispose them
-        // if the user disables syntax highlighting
-        if (this.decorations == null) {
-            this.decorations = initDecorations();
-        }
-
-        const byTag: Map<string, vscode.Range[]> = new Map();
-        const colorfulIdents: Map<
-            string,
-            [vscode.Range[], boolean]
-        > = new Map();
-        const rainbowTime = this.ctx.config.rainbowHighlightingOn;
-
-        for (const tag of this.decorations.keys()) {
-            byTag.set(tag, []);
-        }
-
-        for (const d of highlights) {
-            if (!byTag.get(d.tag)) {
-                continue;
-            }
-
-            if (rainbowTime && d.bindingHash) {
-                if (!colorfulIdents.has(d.bindingHash)) {
-                    const mut = d.tag.endsWith('.mut');
-                    colorfulIdents.set(d.bindingHash, [[], mut]);
-                }
-                colorfulIdents
-                    .get(d.bindingHash)![0]
-                    .push(
-                        client.protocol2CodeConverter.asRange(d.range),
-                    );
-            } else {
-                byTag
-                    .get(d.tag)!
-                    .push(
-                        client.protocol2CodeConverter.asRange(d.range),
-                    );
-            }
-        }
-
-        for (const tag of byTag.keys()) {
-            const dec = this.decorations.get(
-                tag,
-            ) as vscode.TextEditorDecorationType;
-            const ranges = byTag.get(tag)!;
-            editor.setDecorations(dec, ranges);
-        }
-
-        for (const [hash, [ranges, mut]] of colorfulIdents.entries()) {
-            const textDecoration = mut ? 'underline' : undefined;
-            const dec = vscode.window.createTextEditorDecorationType({
-                light: { color: fancify(hash, 'light'), textDecoration },
-                dark: { color: fancify(hash, 'dark'), textDecoration },
-            });
-            editor.setDecorations(dec, ranges);
-        }
-    }
-}
-
-function initDecorations(): Map<string, vscode.TextEditorDecorationType> {
-    const theme = ColorTheme.load();
-    const res = new Map();
-    TAG_TO_SCOPES.forEach((scopes, tag) => {
-        // We are going to axe this soon, so don't try to detect unknown tags.
-        // Users should switch to the new semantic tokens implementation.
-        if (!scopes) return;
-        const rule = theme.lookup(scopes);
-        const decor = createDecorationFromTextmate(rule);
-        res.set(tag, decor);
-    });
-    return res;
-}
-
-function createDecorationFromTextmate(
-    themeStyle: TextMateRuleSettings,
-): vscode.TextEditorDecorationType {
-    const decorationOptions: vscode.DecorationRenderOptions = {};
-    decorationOptions.rangeBehavior = vscode.DecorationRangeBehavior.OpenOpen;
-
-    if (themeStyle.foreground) {
-        decorationOptions.color = themeStyle.foreground;
-    }
-
-    if (themeStyle.background) {
-        decorationOptions.backgroundColor = themeStyle.background;
-    }
-
-    if (themeStyle.fontStyle) {
-        const parts: string[] = themeStyle.fontStyle.split(' ');
-        parts.forEach(part => {
-            switch (part) {
-                case 'italic':
-                    decorationOptions.fontStyle = 'italic';
-                    break;
-                case 'bold':
-                    decorationOptions.fontWeight = 'bold';
-                    break;
-                case 'underline':
-                    decorationOptions.textDecoration = 'underline';
-                    break;
-                default:
-                    break;
-            }
-        });
-    }
-    return vscode.window.createTextEditorDecorationType(decorationOptions);
-}
-
-// sync with tags from `syntax_highlighting.rs`.
-const TAG_TO_SCOPES = new Map<string, string[]>([
-    ["field", ["entity.name.field"]],
-    ["function", ["entity.name.function"]],
-    ["module", ["entity.name.module"]],
-    ["constant", ["entity.name.constant"]],
-    ["macro", ["entity.name.macro"]],
-
-    ["variable", ["variable"]],
-    ["variable.mutable", ["variable", "meta.mutable"]],
-
-    ["type", ["entity.name.type"]],
-    ["type.builtin", ["entity.name.type", "support.type.primitive"]],
-    ["type.self", ["entity.name.type.parameter.self"]],
-    ["type.param", ["entity.name.type.parameter", "entity.name.type.param.rust"]],
-    ["type.lifetime", ["entity.name.type.lifetime", "entity.name.lifetime.rust"]],
-
-    ["literal.byte", ["constant.character.byte"]],
-    ["literal.char", ["constant.character.rust"]],
-    ["numeric_literal", ["constant.numeric"]],
-
-    ["comment", ["comment"]],
-    ["string_literal", ["string.quoted"]],
-    ["attribute", ["meta.attribute.rust"]],
-
-    ["keyword", ["keyword"]],
-    ["keyword.unsafe", ["keyword.other.unsafe"]],
-    ["keyword.control", ["keyword.control"]],
-]);
-
-function randomU32Numbers(seed: number) {
-    let random = seed | 0;
-    return () => {
-        random ^= random << 13;
-        random ^= random >> 17;
-        random ^= random << 5;
-        random |= 0;
-        return random;
-    };
-}
-
-function hashString(str: string): number {
-    let res = 0;
-    for (let i = 0; i < str.length; ++i) {
-        const c = str.codePointAt(i)!;
-        res = (res * 31 + c) & ~0;
-    }
-    return res;
-}
diff --git a/editors/code/src/main.ts b/editors/code/src/main.ts
index 7ba16120c..4f3b89f44 100644
--- a/editors/code/src/main.ts
+++ b/editors/code/src/main.ts
@@ -7,7 +7,6 @@ import * as commands from './commands';
 import { activateInlayHints } from './inlay_hints';
 import { activateStatusDisplay } from './status_display';
 import { Ctx } from './ctx';
-import { activateHighlighting } from './highlighting';
 import { Config, NIGHTLY_TAG } from './config';
 import { log, assert } from './util';
 import { PersistentState } from './persistent_state';
@@ -97,9 +96,6 @@ export async function activate(context: vscode.ExtensionContext) {
 
     activateStatusDisplay(ctx);
 
-    if (!ctx.config.highlightingSemanticTokens) {
-        activateHighlighting(ctx);
-    }
     activateInlayHints(ctx);
 
     vscode.workspace.onDidChangeConfiguration(