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)$"))
 35
 36; Function calls
 37
 38((identifier) @function.method.builtin
 39 (#eq? @function.method.builtin "require"))
 40
 41"defined?" @function.method.builtin
 42
 43(call
 44  method: [(identifier) (constant)] @function.method)
 45
 46; Function definitions
 47
 48(alias (identifier) @function.method)
 49(setter (identifier) @function.method)
 50(method name: [(identifier) (constant)] @function.method)
 51(singleton_method name: [(identifier) (constant)] @function.method)
 52(method_parameters [
 53  (identifier) @variable.parameter
 54  (optional_parameter name: (identifier) @variable.parameter)
 55  (keyword_parameter [name: (identifier) (":")] @variable.parameter)
 56  ])
 57
 58(block_parameters (identifier) @variable.parameter)
 59
 60; Identifiers
 61
 62((identifier) @constant.builtin
 63 (#match? @constant.builtin "^__(FILE|LINE|ENCODING)__$"))
 64
 65(file) @constant.builtin
 66(line) @constant.builtin
 67(encoding) @constant.builtin
 68
 69(hash_splat_nil
 70  "**" @operator
 71) @constant.builtin
 72
 73(global_variable) @constant
 74
 75(constant) @type
 76
 77((constant) @constant
 78 (#match? @constant "^[A-Z\\d_]+$"))
 79
 80(superclass
 81  (constant) @type.super)
 82
 83(superclass
 84  (scope_resolution
 85    (constant) @type.super))
 86
 87(superclass
 88  (scope_resolution
 89    (scope_resolution
 90      (constant) @type.super)))
 91
 92(self) @variable.special
 93(super) @variable.special
 94
 95[
 96  (class_variable)
 97  (instance_variable)
 98] @variable.member
 99
100
101; Literals
102
103[
104  (string)
105  (bare_string)
106  (subshell)
107  (heredoc_body)
108  (heredoc_beginning)
109] @string
110
111[
112  (simple_symbol)
113  (delimited_symbol)
114  (hash_key_symbol)
115  (bare_symbol)
116] @string.special.symbol
117
118(regex) @string.regex
119(escape_sequence) @escape
120
121[
122  (integer)
123  (float)
124] @number
125
126[
127  (nil)
128  (true)
129  (false)
130] @constant.builtin
131
132(comment) @comment
133
134; Operators
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  "*="
166  "/="
167  "%="
168  "+="
169  "-="
170  "<<="
171  ">>="
172  "&&="
173  "&="
174  "||="
175  "|="
176  "^="
177  "=>"
178  "->"
179  (operator)
180] @operator
181
182[
183  ","
184  ";"
185  "."
186  "::"
187] @punctuation.delimiter
188
189[
190  "("
191  ")"
192  "["
193  "]"
194  "{"
195  "}"
196  "%w("
197  "%i("
198] @punctuation.bracket
199
200(interpolation
201  "#{" @punctuation.special
202  "}" @punctuation.special) @embedded