GetOperator returns the operator for a given literal or nil if there is no registered operator with the given sign.

IsOperator checks if a given literal is associated with a registered operator and returns true is that is the case.

AssocLeft is the left associativity.

AssocRight is the right associativity.

OperandTypeError is an error that indicates a wrong type of input variable given into an operation This error is caused by the user of the library and shall therefore be passed up to the CLI.

Operator is a function with the given name *Identifier*, that is performed on input values whenever *OperatorSign* is between them (infix).

ApplierFunc represents the function that is performed by an operator, taking a variable number of inputs as gjson.Result and returning again a gjson.Result.