#file grammmar.lark

testcase : "(" DEC_NUMBER "," value ("," value)* ")" [","] [SH_COMMENT]
    
    value: list
         | tuple
         | emptyset
         | set
         | string
         | number
         | "True"    -> true
         | "False"   -> false
         | "None"    -> none

    list : "[" [value ("," value)*] "]"

    tuple: "(" [value ("," value)*] ")"

    set  : "{" value ("," value)* "}"

    emptyset: "set()"
    
    number: DEC_NUMBER | FLOAT_NUMBER 
  
    string: /[ubf]?r?("(?!"").*?(?<!\\)(\\\\)*?"|'(?!'').*?(?<!\\)(\\\\)*?')/i

    DEC_NUMBER: /0|[1-9][\d_]*/i
    FLOAT_NUMBER: /((\d+\.[\d_]*|\.[\d_]+)([Ee][-+]?\d+)?|\d+([Ee][-+]?\d+))/
        
    %import common.ESCAPED_STRING
    %import common.SH_COMMENT
    %import common.CNAME
    %import common.SIGNED_NUMBER
    %import common.WS
    %ignore WS