// MultipleChoice computes the score of a multiple choice exercise
// with student answers provided in fileName, and the answers provided
// in the answerKey object. The function requires a Score object, and
// will produce both string output and JSON output.
func MultipleChoice(t *testing.T, sc *score.Score, fileName string, answers Choices) {
defer sc.WriteString(os.Stdout)
defer sc.WriteJSON(os.Stdout)
// Read the whole file
bytes, err := ioutil.ReadFile(fileName)
if err != nil {
sc.Score = 0
t.Fatalf(fmt.Sprintf("%v: error reading the file: %v", fileName, err))
return
}
for i := range answers {
// Find the user's answer to the corresponding question number
regexStr := "\n" + strconv.Itoa(answers[i].Number) + "[.)]*[ \t\v\r\n\f]*[A-Za-z]*"
regex := regexp.MustCompile(regexStr)
userAnswer := regex.Find(bytes)
if userAnswer == nil {
t.Errorf("%v %d: Answer not found.\n", sc.TestName, answers[i].Number)
sc.Dec()
} else {
r, _ := utf8.DecodeLastRune(userAnswer)
got, _ := utf8.DecodeLastRuneInString(strings.ToUpper(string(r)))
if got != answers[i].Want {
t.Errorf("%v %d: %q is incorrect.\n", sc.TestName, answers[i].Number, got)
sc.Dec()
}
}
}
}
