1; Keywords
  2
  3[
  4  "alias"
  5  "and"
  6  "begin"
  7  "break"
  8  "case"
  9  "class"
 10  "def"
 11  "do"
 12  "else"
 13  "elsif"
 14  "end"
 15  "ensure"
 16  "for"
 17  "if"
 18  "in"
 19  "module"
 20  "next"
 21  "or"
 22  "rescue"
 23  "retry"
 24  "return"
 25  "then"
 26  "unless"
 27  "until"
 28  "when"
 29  "while"
 30  "yield"
 31] @keyword
 32
 33((identifier) @keyword
 34 (#match? @keyword "^(private|protected|public)$"))
 35
 36; Function calls
 37
 38((identifier) @function.method.builtin
 39 (#eq? @function.method.builtin "require"))
 40
 41"defined?" @function.method.builtin
 42
 43(call
 44  method: [(identifier) (constant)] @function.method)
 45
 46; Function definitions
 47
 48(alias (identifier) @function.method)
 49(setter (identifier) @function.method)
 50(method name: [(identifier) (constant)] @function.method)
 51(singleton_method name: [(identifier) (constant)] @function.method)
 52(method_parameters [
 53  (identifier) @variable.parameter
 54  (optional_parameter name: (identifier) @variable.parameter)
 55  (keyword_parameter [name: (identifier) (":")] @variable.parameter)
 56  ])
 57
 58; Identifiers
 59
 60((identifier) @constant.builtin
 61 (#match? @constant.builtin "^__(FILE|LINE|ENCODING)__$"))
 62
 63(file) @constant.builtin
 64(line) @constant.builtin
 65(encoding) @constant.builtin
 66
 67(hash_splat_nil
 68  "**" @operator
 69) @constant.builtin
 70
 71((constant) @constant
 72 (#match? @constant "^[A-Z\\d_]+$"))
 73
 74(global_variable) @constant
 75
 76(constant) @type
 77
 78(self) @variable.special
 79(super) @variable.special
 80
 81[
 82  (class_variable)
 83  (instance_variable)
 84] @variable.member
 85
 86
 87; Literals
 88
 89[
 90  (string)
 91  (bare_string)
 92  (subshell)
 93  (heredoc_body)
 94  (heredoc_beginning)
 95] @string
 96
 97[
 98  (simple_symbol)
 99  (delimited_symbol)
100  (hash_key_symbol)
101  (bare_symbol)
102] @string.special.symbol
103
104(regex) @string.regex
105(escape_sequence) @escape
106
107[
108  (integer)
109  (float)
110] @number
111
112[
113  (nil)
114  (true)
115  (false)
116] @constant.builtin
117
118(comment) @comment
119
120; Operators
121
122[
123  "!"
124  "~"
125  "+"
126  "-"
127  "**"
128  "*"
129  "/"
130  "%"
131  "<<"
132  ">>"
133  "&"
134  "|"
135  "^"
136  ">"
137  "<"
138  "<="
139  ">="
140  "=="
141  "!="
142  "=~"
143  "!~"
144  "<=>"
145  "||"
146  "&&"
147  ".."
148  "..."
149  "="
150  "**="
151  "*="
152  "/="
153  "%="
154  "+="
155  "-="
156  "<<="
157  ">>="
158  "&&="
159  "&="
160  "||="
161  "|="
162  "^="
163  "=>"
164  "->"
165  (operator)
166] @operator
167
168[
169  ","
170  ";"
171  "."
172] @punctuation.delimiter
173
174[
175  "("
176  ")"
177  "["
178  "]"
179  "{"
180  "}"
181  "%w("
182  "%i("
183] @punctuation.bracket
184
185(interpolation
186  "#{" @punctuation.special
187  "}" @punctuation.special) @embedded