Function lineDiff

executor/checker.go:48–91

逐行比较，获取错误行数 Compare each line, to find out the number of wrong line

(session *JudgeSession, rst *commonStructs.TestCaseResult)

// 逐行比较，获取错误行数
// Compare each line, to find out the number of wrong line
func lineDiff(session *JudgeSession, rst *commonStructs.TestCaseResult) (sameLines int, totalLines int) {
	answer, err := os.OpenFile(path.Join(session.ConfigDir, rst.Output), os.O_RDONLY|syscall.O_NONBLOCK, 0)
	if err != nil {
		return 0, 0
	}
	defer answer.Close()
	userout, err := os.Open(path.Join(session.SessionDir, rst.ProgramOut))
	if err != nil {
		return 0, 0
	}
	defer userout.Close()

	useroutBuffer := bufio.NewReader(userout)
	answerBuffer := bufio.NewReader(answer)

	var (
		leftStr        = ""
		rightStr       = ""
		leftErr  error = nil
		rightErr error = nil
		leftCnt        = 0
		rightCnt       = 0
	)

	for leftErr == nil {
		leftStr, leftErr = readLineAndRemoveSpaceChar(answerBuffer)
		if leftStr == "" {
			continue
		}

		leftCnt++

		for rightStr == "" && rightErr == nil {
			rightStr, rightErr = readLineAndRemoveSpaceChar(useroutBuffer)
		}

		if rightStr == leftStr {
			rightCnt++
		}
		rightStr = ""
	}

	return rightCnt, leftCnt
}

// 严格比较每一个字符
// Compare each char in buffer strictly