Add Svelte support (#2720)

fixes https://github.com/zed-industries/community/issues/432

Release Notes:

- Added support for the svelte language

Cargo.lock

@@ -8118,8 +8118,17 @@ dependencies = [
 
 [[package]]
 name = "tree-sitter-scheme"
-version = "0.2.0"
+version = "0.5.0"
-source = "git+https://github.com/6cdh/tree-sitter-scheme?rev=af0fd1fa452cb2562dc7b5c8a8c55551c39273b9#af0fd1fa452cb2562dc7b5c8a8c55551c39273b9"
+source = "git+https://github.com/6cdh/tree-sitter-scheme?rev=ca8af220aaf2a80aaf609bfb0df193817e4f064b#ca8af220aaf2a80aaf609bfb0df193817e4f064b"
+dependencies = [
+ "cc",
+ "tree-sitter",
+]
+
+[[package]]
+name = "tree-sitter-svelte"
+version = "0.10.2"
+source = "git+https://github.com/Himujjal/tree-sitter-svelte?rev=697bb515471871e85ff799ea57a76298a71a9cca#697bb515471871e85ff799ea57a76298a71a9cca"
 dependencies = [
  "cc",
  "tree-sitter",
@@ -9555,6 +9564,7 @@ dependencies = [
  "tree-sitter-ruby",
  "tree-sitter-rust",
  "tree-sitter-scheme",
+ "tree-sitter-svelte",
  "tree-sitter-toml",
  "tree-sitter-typescript 0.20.2 (git+https://github.com/tree-sitter/tree-sitter-typescript?rev=5d20856f34315b068c41edaee2ac8a100081d259)",
  "tree-sitter-yaml",

crates/zed/Cargo.toml

@@ -119,9 +119,10 @@ tree-sitter-toml = { git = "https://github.com/tree-sitter/tree-sitter-toml", re
 tree-sitter-typescript = { git = "https://github.com/tree-sitter/tree-sitter-typescript", rev = "5d20856f34315b068c41edaee2ac8a100081d259" }
 tree-sitter-ruby = "0.20.0"
 tree-sitter-html = "0.19.0"
-tree-sitter-scheme = { git = "https://github.com/6cdh/tree-sitter-scheme", rev = "af0fd1fa452cb2562dc7b5c8a8c55551c39273b9"}
+tree-sitter-scheme = { git = "https://github.com/6cdh/tree-sitter-scheme", rev = "ca8af220aaf2a80aaf609bfb0df193817e4f064b"}
 tree-sitter-racket = { git = "https://github.com/zed-industries/tree-sitter-racket", rev = "eb010cf2c674c6fd9a6316a84e28ef90190fe51a"}
 tree-sitter-yaml = { git = "https://github.com/zed-industries/tree-sitter-yaml", rev = "f545a41f57502e1b5ddf2a6668896c1b0620f930"}
+tree-sitter-svelte = { git = "https://github.com/Himujjal/tree-sitter-svelte", rev = "697bb515471871e85ff799ea57a76298a71a9cca"}
 tree-sitter-lua = "0.0.14"
 url = "2.2"
 urlencoding = "2.1.2"

crates/zed/src/languages.rs

@@ -16,6 +16,7 @@ mod lua;
 mod python;
 mod ruby;
 mod rust;
+mod svelte;
 mod typescript;
 mod yaml;
 
@@ -135,7 +136,14 @@ pub fn init(languages: Arc<LanguageRegistry>, node_runtime: Arc<NodeRuntime>) {
     language(
         "yaml",
         tree_sitter_yaml::language(),
-        vec![Arc::new(yaml::YamlLspAdapter::new(node_runtime))],
+        vec![Arc::new(yaml::YamlLspAdapter::new(node_runtime.clone()))],
+    );
+    language(
+        "svelte",
+        tree_sitter_svelte::language(),
+        vec![Arc::new(svelte::SvelteLspAdapter::new(
+            node_runtime.clone(),
+        ))],
     );
 }
 

crates/zed/src/languages/svelte.rs

@@ -0,0 +1,125 @@
+use anyhow::{anyhow, Result};
+use async_trait::async_trait;
+use futures::StreamExt;
+use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
+use lsp::LanguageServerBinary;
+use node_runtime::NodeRuntime;
+use serde_json::json;
+use smol::fs;
+use std::{
+    any::Any,
+    ffi::OsString,
+    path::{Path, PathBuf},
+    sync::Arc,
+};
+use util::ResultExt;
+
+const SERVER_PATH: &'static str = "node_modules/svelte-language-server/bin/server.js";
+
+fn server_binary_arguments(server_path: &Path) -> Vec<OsString> {
+    vec![server_path.into(), "--stdio".into()]
+}
+
+pub struct SvelteLspAdapter {
+    node: Arc<NodeRuntime>,
+}
+
+impl SvelteLspAdapter {
+    pub fn new(node: Arc<NodeRuntime>) -> Self {
+        SvelteLspAdapter { node }
+    }
+}
+
+#[async_trait]
+impl LspAdapter for SvelteLspAdapter {
+    async fn name(&self) -> LanguageServerName {
+        LanguageServerName("svelte-language-server".into())
+    }
+
+    async fn fetch_latest_server_version(
+        &self,
+        _: &dyn LspAdapterDelegate,
+    ) -> Result<Box<dyn 'static + Any + Send>> {
+        Ok(Box::new(
+            self.node
+                .npm_package_latest_version("svelte-language-server")
+                .await?,
+        ) as Box<_>)
+    }
+
+    async fn fetch_server_binary(
+        &self,
+        version: Box<dyn 'static + Send + Any>,
+        container_dir: PathBuf,
+        _: &dyn LspAdapterDelegate,
+    ) -> Result<LanguageServerBinary> {
+        let version = version.downcast::<String>().unwrap();
+        let server_path = container_dir.join(SERVER_PATH);
+
+        if fs::metadata(&server_path).await.is_err() {
+            self.node
+                .npm_install_packages(
+                    &container_dir,
+                    [("svelte-language-server", version.as_str())],
+                )
+                .await?;
+        }
+
+        Ok(LanguageServerBinary {
+            path: self.node.binary_path().await?,
+            arguments: server_binary_arguments(&server_path),
+        })
+    }
+
+    async fn cached_server_binary(
+        &self,
+        container_dir: PathBuf,
+        _: &dyn LspAdapterDelegate,
+    ) -> Option<LanguageServerBinary> {
+        get_cached_server_binary(container_dir, &self.node).await
+    }
+
+    async fn installation_test_binary(
+        &self,
+        container_dir: PathBuf,
+    ) -> Option<LanguageServerBinary> {
+        get_cached_server_binary(container_dir, &self.node).await
+    }
+
+    async fn initialization_options(&self) -> Option<serde_json::Value> {
+        Some(json!({
+            "provideFormatter": true
+        }))
+    }
+}
+
+async fn get_cached_server_binary(
+    container_dir: PathBuf,
+    node: &NodeRuntime,
+) -> Option<LanguageServerBinary> {
+    (|| async move {
+        let mut last_version_dir = None;
+        let mut entries = fs::read_dir(&container_dir).await?;
+        while let Some(entry) = entries.next().await {
+            let entry = entry?;
+            if entry.file_type().await?.is_dir() {
+                last_version_dir = Some(entry.path());
+            }
+        }
+        let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
+        let server_path = last_version_dir.join(SERVER_PATH);
+        if server_path.exists() {
+            Ok(LanguageServerBinary {
+                path: node.binary_path().await?,
+                arguments: server_binary_arguments(&server_path),
+            })
+        } else {
+            Err(anyhow!(
+                "missing executable in directory {:?}",
+                last_version_dir
+            ))
+        }
+    })()
+    .await
+    .log_err()
+}

crates/zed/src/languages/svelte/config.toml

@@ -0,0 +1,18 @@
+name = "Svelte"
+path_suffixes = ["svelte"]
+line_comment = "// "
+autoclose_before = ";:.,=}])>"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "(", end = ")", close = true, newline = true },
+    { start = "<", end = ">", close = false, newline = true, not_in = ["string", "comment"] },
+    { start = "\"", end = "\"", close = true, newline = false, not_in = ["string"] },
+    { start = "'", end = "'", close = true, newline = false, not_in = ["string", "comment"] },
+    { start = "`", end = "`", close = true, newline = false, not_in = ["string"] },
+    { start = "/*", end = " */", close = true, newline = false, not_in = ["string", "comment"] },
+]
+
+[overrides.element]
+line_comment = { remove = true }
+block_comment = ["{/* ", " */}"]

crates/zed/src/languages/svelte/folds.scm

@@ -0,0 +1,9 @@
+[
+ (style_element)
+ (script_element)
+ (element)
+ (if_statement)
+ (else_statement)
+ (each_statement)
+ (await_statement)
+] @fold

crates/zed/src/languages/svelte/highlights.scm

@@ -0,0 +1,42 @@
+; Special identifiers
+;--------------------
+
+; TODO:
+(tag_name) @tag
+(attribute_name) @property
+(erroneous_end_tag_name) @keyword
+(comment) @comment
+
+[
+  (attribute_value)
+  (quoted_attribute_value)
+] @string
+
+[
+  (text)
+  (raw_text_expr)
+] @none
+
+[
+  (special_block_keyword)
+  (then)
+  (as)
+] @keyword
+
+[
+  "{"
+  "}"
+] @punctuation.bracket
+
+"=" @operator
+
+[
+  "<"
+  ">"
+  "</"
+  "/>"
+  "#"
+  ":"
+  "/"
+  "@"
+] @tag.delimiter

crates/zed/src/languages/svelte/indents.scm

@@ -0,0 +1,8 @@
+[
+  (element)
+  (if_statement)
+  (each_statement)
+  (await_statement)
+  (script_element)
+  (style_element)
+] @indent

crates/zed/src/languages/svelte/injections.scm

@@ -0,0 +1,28 @@
+; injections.scm
+; --------------
+(script_element
+  (raw_text) @content
+  (#set! "language" "javascript"))
+
+ ((script_element
+     (start_tag
+       (attribute
+         (quoted_attribute_value (attribute_value) @_language)))
+      (raw_text) @content)
+    (#eq? @_language "ts")
+    (#set! "language" "typescript"))
+
+((script_element
+    (start_tag
+        (attribute
+        (quoted_attribute_value (attribute_value) @_language)))
+    (raw_text) @content)
+  (#eq? @_language "typescript")
+  (#set! "language" "typescript"))
+
+(style_element
+  (raw_text) @content
+  (#set! "language" "css"))
+
+((raw_text_expr) @content
+  (#set! "language" "javascript"))