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answerReader.go
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/
answerReader.go
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package main
import (
"bufio"
"os"
"strconv"
"strings"
"github.com/joomcode/errorx"
)
var (
ErrAnswerReaderNamespace = errorx.NewNamespace("answerReader")
ErrFailedReadAnswer = errorx.NewType(ErrAnswerReaderNamespace, "FailedReadAnswer")
)
type AnswerReader interface {
Read(printer Printer, index int, example Example) (*Answer, error)
}
type ConsoleAnswerReader struct {
}
func (r *ConsoleAnswerReader) Read(printer Printer, index int, example Example) (*Answer, error) {
for {
printer.Print("%v) %v = ", index, example.ExerciseString())
reader := bufio.NewReader(os.Stdin)
answerString, err := reader.ReadString('\n')
if err != nil {
return nil, ErrFailedReadAnswer.WrapWithNoMessage(err)
}
printer.PrintUserInput(answerString)
answerInt, err := strconv.Atoi(strings.TrimSpace(answerString))
if err != nil {
printer.Println("Невозможно прочитать ответ, ответ должен быть числом")
continue
}
answer := Answer{example, answerInt}
return &answer, nil
}
}
func NewConsoleAnswerReader() AnswerReader {
return &ConsoleAnswerReader{}
}