input

type OperationProcessor ¶

type OperationProcessor interface {
	ProcessOperation(operation calculator.Operation) (*string, error)
}

OperationProcessor is the interface for processing mathematical operations

type Parser ¶

type Parser struct {
	// contains filtered or unexported fields
}

Parser is responsible for converting input to mathematical operations

func NewParser(op OperationProcessor, v ValidationHelper) *Parser

func (p *Parser) ProcessExpression(expr string) (*string, error)

type ValidationHelper ¶

type ValidationHelper interface {
	CheckInput(operator string, operands []float64) error
}

ValidationHelper is the interface for input valeidation

type Validator ¶

type Validator struct {
	// contains filtered or unexported fields
}

func NewValidator(expLen int, validOps []string) *Validator

func (v *Validator) CheckInput(operator string, operands []float64) error