languages: add svelte support (#733)

* languages: add svelte support

* languages: add svelte injections

.gitmodules

@@ -118,3 +118,7 @@
 	path = helix-syntax/languages/tree-sitter-zig
 	url = https://github.com/maxxnino/tree-sitter-zig
 	shallow = true
+[submodule "helix-syntax/languages/tree-sitter-svelte"]
+	path = helix-syntax/languages/tree-sitter-svelte
+	url = https://github.com/Himujjal/tree-sitter-svelte
+	shallow = true

languages.toml

@@ -277,6 +277,15 @@ roots = []
 comment-token = "--"
 indent = { tab-width = 2, unit = "  " }
 
+[[language]]
+name = "svelte"
+scope = "source.svelte"
+injection-regex = "svelte"
+file-types = ["svelte"]
+roots = []
+indent = { tab-width = 2, unit = "  " }
+language-server = { command = "svelteserver", args = ["--stdio"] }
+
 [[language]]
 name = "yaml"
 scope = "source.yaml"

runtime/queries/svelte/highlights.scm

@@ -0,0 +1,68 @@
+; Special identifiers
+;--------------------
+
+; TODO:
+((element (start_tag (tag_name) @_tag) (text) @markup.heading)
+ (#match? @_tag "^(h[0-9]|title)$"))
+
+((element (start_tag (tag_name) @_tag) (text) @markup.bold)
+ (#match? @_tag "^(strong|b)$"))
+
+((element (start_tag (tag_name) @_tag) (text) @markup.italic)
+ (#match? @_tag "^(em|i)$"))
+
+; ((element (start_tag (tag_name) @_tag) (text) @markup.strike)
+; (#match? @_tag "^(s|del)$"))
+
+((element (start_tag (tag_name) @_tag) (text) @markup.underline)
+ (#eq? @_tag "u"))
+
+((element (start_tag (tag_name) @_tag) (text) @markup.inline)
+ (#match? @_tag "^(code|kbd)$"))
+
+((element (start_tag (tag_name) @_tag) (text) @markup.underline.link)
+ (#eq? @_tag "a"))
+
+((attribute
+   (attribute_name) @_attr
+   (quoted_attribute_value (attribute_value) @markup.undeline.link))
+ (#match? @_attr "^(href|src)$"))
+
+(tag_name) @tag
+(attribute_name) @property
+(erroneous_end_tag_name) @error
+(comment) @comment
+
+[
+  (attribute_value)
+  (quoted_attribute_value)
+] @string
+
+[
+  (text)
+  (raw_text_expr)
+] @none
+
+[
+  (special_block_keyword)
+  (then)
+  (as)
+] @keyword
+
+[
+  "{"
+  "}"
+] @punctuation.brackets
+
+"=" @operator
+
+[
+  "<"
+  ">"
+  "</"
+  "/>"
+  "#"
+  ":"
+  "/"
+  "@"
+] @punctuation.definition.tag

runtime/queries/svelte/indents.toml

@@ -0,0 +1,18 @@
+indent = [
+  "element"
+  "if_statement"
+  "each_statement"
+  "await_statement"
+]
+
+outdent = [
+  "end_tag"
+  "else_statement"
+  "if_end_expr"
+  "each_end_expr"
+  "await_end_expr"
+  ">"
+  "/>"
+]
+
+ignore = "comment" 

runtime/queries/svelte/injections.scm

@@ -0,0 +1,30 @@
+; injections.scm
+; --------------
+((style_element
+  (raw_text) @injection.content)
+  (#set! injection.language "css"))
+
+((attribute
+   (attribute_name) @_attr
+   (quoted_attribute_value (attribute_value) @css))
+ (#eq? @_attr "style"))
+
+((script_element
+  (raw_text) @injection.content)
+  (#set! injection.language "javascript"))
+
+((raw_text_expr) @injection.content
+ (#set! injection.language "javascript"))
+
+(
+  (script_element
+    (start_tag
+      (attribute
+        (quoted_attribute_value (attribute_value) @_lang)))
+    (raw_text) @injection.content)
+  (#match? @_lang "(ts|typescript)")
+  (#set! injection.language "typescript")
+)
+
+(comment) @comment
+