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) @variable
 34
 35((identifier) @keyword
 36 (#match? @keyword "^(private|protected|public)$"))
 37
 38; Function calls
 39
 40((identifier) @function.method.builtin
 41 (#eq? @function.method.builtin "require"))
 42
 43"defined?" @function.method.builtin
 44
 45(call
 46  method: [(identifier) (constant)] @function.method)
 47
 48; Function definitions
 49
 50(alias (identifier) @function.method)
 51(setter (identifier) @function.method)
 52(method name: [(identifier) (constant)] @function.method)
 53(singleton_method name: [(identifier) (constant)] @function.method)
 54
 55; Identifiers
 56
 57[
 58  (class_variable)
 59  (instance_variable)
 60] @property
 61
 62((identifier) @constant.builtin
 63 (#match? @constant.builtin "^__(FILE|LINE|ENCODING)__$"))
 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((constant) @constant
 74 (#match? @constant "^[A-Z\\d_]+$"))
 75
 76(constant) @type
 77
 78(self) @variable.special
 79(super) @variable.special
 80
 81; Literals
 82
 83[
 84  (string)
 85  (bare_string)
 86  (subshell)
 87  (heredoc_body)
 88  (heredoc_beginning)
 89] @string
 90
 91[
 92  (simple_symbol)
 93  (delimited_symbol)
 94  (hash_key_symbol)
 95  (bare_symbol)
 96] @string.special.symbol
 97
 98(regex) @string.regex
 99(escape_sequence) @escape
100
101[
102  (integer)
103  (float)
104] @number
105
106[
107  (nil)
108  (true)
109  (false)
110] @constant.builtin
111
112(comment) @comment
113
114; Operators
115
116[
117  "!"
118  "~"
119  "+"
120  "-"
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  (operator)
160] @operator
161
162[
163  ","
164  ";"
165  "."
166] @punctuation.delimiter
167
168[
169  "("
170  ")"
171  "["
172  "]"
173  "{"
174  "}"
175  "%w("
176  "%i("
177] @punctuation.bracket
178
179(interpolation
180  "#{" @punctuation.special
181  "}" @punctuation.special) @embedded