grammar.lark

document : stream
         | value

stream : "#." (value  "#." value)*

value : tagged
      | atom

tagged : name [attrs] atom
       | "(" name attr* ")" 

attrs : "(" meta_item* ")"

attr : name "=" atom

atom : object
     | array
     | date_time
     | symbol
     | number
     | string
     | bool
     | "null"

object : "{" pair* "}"

pair : name ":" value

array : "[" value* "]"

bool : "true" | "false"

symbol : "$" name

number : NUMBER_LITERAL 
       | HEX_LITERAL
       | OCT_LITERAL
       | BIN_LITERAL 

date_time : date
       | TIME_FORMAT

date : DATE_FORMAT [ ("_" | "T") TIME_FORMAT TIME_OFFSET]

string : STRING_LITERAL
       | BLOB_LITERAL

name : VARIABLE
     | QUOTED_VARIABLE

VARIABLE : /[^\"`$:;{}\[\]=\(\)\t\r\n ,0-9]{1}[^\"`$:;{}\[\]=\(\)\t\r\n ,]*/

QUOTED_VARIABLE : /"(?:[^\\"]|\\(?:[bfnrtv"\\/]))*"/

STRING_LITERAL : /"(?:[^\\"]|\\(?:[bfnrtv"\\/]|x[0-9a-fA-F]|u[0-9a-fA-F]{4}|U[0-9a-fA-F]))*"/

BLOB_LITERAL : /`(?:[^\\`\u\U]|\\(?:[bfnrtv`\\/]|x[0-9a-fA-F]))*`/

NUMBER_LITERAL : /-?(0|[1-9]\d*)(\.\d+)?([eE][+-]?\d+)?/

HEX_LITERAL : /0x[0-9a-fA-F]{1}([0-9a-fA-F]{1}|_[0-9a-fA-F]{1})*/

OCT_LITERAL : /0o[0-8]{1}([0-8]{1}|_[0-8]{1})*/

BIN_LITERAL : /0b[01]{1}([01]{1}|_[01]{1})*/

DATE_FORMAT : /\d{4}-\d{2}-\d{2}/

TIME_FORMAT : /\d{2}:\d{2}:\d{2}(\.\d+)?/

TIME_OFFSET : /Z|[+-]\d{2}:\d{2}/

WHITESPACE : /[ \t\n\r,]+/

COMMENT : /;.*/