Add highlight rules

Author: jonatanklosko

grammar.js

@@ -812,10 +812,6 @@ function sep1(rule, separator) {
   return seq(rule, repeat(seq(separator, rule)));
 }
 
-function sep(rule, separator) {
-  return optional(sep1(rule, separator));
-}
-
 function unaryOp($, assoc, precedence, operator, right = null) {
   // Expression such as `x + y` falls under the "expression vs local call"
   // conflict that we already have. By using dynamic precedence we penalize

package-lock.json

@@ -3,7 +3,12 @@
   "version": "0.19.0",
   "description": "Elixir grammar for tree-sitter",
   "main": "bindings/node",
-  "keywords": ["parser", "lexer", "elixir", "tree-sitter"],
+  "keywords": [
+    "parser",
+    "lexer",
+    "elixir",
+    "tree-sitter"
+  ],
   "scripts": {
     "test": "tree-sitter test",
     "format": "prettier --trailing-comma es5 --write grammar.js",
@@ -16,6 +21,16 @@
   },
   "devDependencies": {
     "prettier": "^2.3.2",
-    "tree-sitter-cli": "^0.20.0"
-  }
+    "tree-sitter-cli": "^0.19.5"
+  },
+  "tree-sitter": [
+    {
+      "scope": "source.elixir",
+      "file-types": [
+        "ex",
+        "exs"
+      ],
+      "injection-regex": "^(ex|elixir)$"
+    }
+  ]
 }

package.json

@@ -0,0 +1,195 @@
+; Reserved keywords
+
+["when" "and" "or" "not" "in" "fn" "do" "end" "catch" "rescue" "after" "else"] @keyword
+
+; Operators
+
+; * doc string
+(unary_operator
+  operator: "@" @comment.doc
+  operand: (call
+    target: (identifier) @comment.doc.__attribute__
+    (arguments
+      [
+        (string) @comment.doc
+        (charlist) @comment.doc
+        (sigil
+          quoted_start: _ @comment.doc
+          quoted_end: _ @comment.doc) @comment.doc
+        (boolean) @comment.doc
+      ]))
+  (#match? @comment.doc.__attribute__ "^(moduledoc|typedoc|doc)$"))
+
+; * module attribute
+(unary_operator
+  operator: "@" @attribute
+  operand: [
+    (identifier) @attribute
+    (call
+      target: (identifier) @attribute)
+    (boolean) @attribute
+    (nil) @attribute
+  ])
+
+; * capture operand
+(unary_operator
+  operator: "&"
+  operand: (integer) @operator)
+
+(operator_identifier) @operator
+
+(unary_operator
+  operator: _ @operator)
+
+(binary_operator
+  operator: _ @operator)
+
+(dot
+  operator: _ @operator)
+
+(stab_clause
+  operator: _ @operator)
+
+; Literals
+
+[
+  (boolean)
+  (nil)
+] @constant
+
+[
+  (integer)
+  (float)
+] @number
+
+(alias) @type
+
+(char) @constant
+
+; Quoted content
+
+(interpolation "#{" @punctuation.special "}" @punctuation.special) @embedded
+
+(escape_sequence) @string.escape
+
+[
+  (atom)
+  (quoted_atom)
+  (keyword)
+  (quoted_keyword)
+] @string.special.symbol
+
+[
+  (string)
+  (charlist)
+] @string
+
+; Note that we explicitly target sigil quoted start/end, so they are not overridden by delimiters
+
+(sigil
+  (sigil_name) @__name__
+  quoted_start: _ @string
+  quoted_end: _ @string
+  (#match? @__name__ "^[sS]$")) @string
+
+(sigil
+  (sigil_name) @__name__
+  quoted_start: _ @string.regex
+  quoted_end: _ @string.regex
+  (#match? @__name__ "^[rR]$")) @string.regex
+
+(sigil
+  (sigil_name) @__name__
+  quoted_start: _ @string.special
+  quoted_end: _ @string.special) @string.special
+
+; Calls
+
+; * definition keyword
+(call
+  target: (identifier) @keyword
+  (#match? @keyword "^(def|defdelegate|defexception|defguard|defguardp|defimpl|defmacro|defmacrop|defmodule|defn|defnp|defoverridable|defp|defprotocol|defstruct)$"))
+
+; * kernel or special forms keyword
+(call
+  target: (identifier) @keyword
+  (#match? @keyword "^(alias|case|cond|else|for|if|import|quote|raise|receive|require|reraise|super|throw|try|unless|unquote|unquote_splicing|use|with)$"))
+
+; * function call
+(call
+  target: [
+    ; local
+    (identifier) @function
+    ; remote
+    (dot
+      right: (identifier) @function)
+  ])
+
+; * just identifier in function definition
+(call
+  target: (identifier) @keyword
+  (arguments
+    [
+      (identifier) @function
+      (binary_operator
+        left: (identifier) @function
+        operator: "when")
+    ])
+  (#match? @keyword "^(def|defdelegate|defguard|defguardp|defmacro|defmacrop|defn|defnp|defp)$"))
+
+; * pipe into identifier (definition)
+(call
+  target: (identifier) @keyword
+  (arguments
+    (binary_operator
+      operator: "|>"
+      right: (identifier) @variable))
+  (#match? @keyword "^(def|defdelegate|defguard|defguardp|defmacro|defmacrop|defn|defnp|defp)$"))
+
+; * pipe into identifier (function call)
+(binary_operator
+  operator: "|>"
+  right: (identifier) @function)
+
+; Identifiers
+
+; * special
+(
+  (identifier) @constant.builtin
+  (#match? @constant.builtin "^(__MODULE__|__DIR__|__ENV__|__CALLER__|__STACKTRACE__)$")
+)
+
+; * unused
+(
+  (identifier) @comment.unused
+  (#match? @comment.unused "^_")
+)
+
+; * regular
+(identifier) @variable
+
+; Comment
+
+(comment) @comment
+
+; Punctuation
+
+[
+ "%"
+] @punctuation
+
+[
+ ","
+ ";"
+] @punctuation.delimiter
+
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+  "<<"
+  ">>"
+] @punctuation.bracket