token Dot='.' Eq='=' LBrak='[' RBrak=']' Comma=',' LBrace='{' RBrace='}';
token True='true' False='false';
token BasicString='<basic string>' LiteralString='<literal string>'
      MlBasicString='<multi-line basic string>'
      MlLiteralString='<multi-line literal string>'
      Integer='<integer>' Float='<float>' OffsetDateTime='<offset date-time>'
      LocalDateTime='<local date-time>' LocalDate='<local date>'
      LocalTime='<local time>' UnquotedKey='<bare key>';
token Newline Whitespace Comment;

skip Whitespace Comment;

start toml;

toml: [expression] (Newline [expression])*;
expression^: keyval | table;

keyval: key '=' val;
table^: ?1 std_table | array_table;

std_table: '[' header_key ']';
array_table: '[' '[' header_key !1 ']' ']';

header_key: simple_key ('.' simple_key)* @key; // extra rule for better error messages
key: simple_key ('.' simple_key)*;
simple_key: BasicString | LiteralString | UnquotedKey;
val^:
  string
| boolean
| array
| inline_table
| date_time
| float
| integer
;
string: MlBasicString | BasicString | MlLiteralString | LiteralString;
boolean: 'true' | 'false';
array: '[' [?1 Newline* val (?2 Newline* ',' Newline* val)* [?3 Newline* ',']] Newline* ']';
inline_table: '{' [keyval (',' keyval)*] '}';
date_time: OffsetDateTime | LocalDateTime | LocalDate | LocalTime;
integer: Integer;
float: Float;