今天做了一个公司的面试题目C#实现词法分析器

题目是写个词法分析器,开始理解错题目了,后来知道题目的意思觉得不是很难

目的是实现一个文本文件的内容分析,当然这个文本全是按一定的格式输出的

下面写上主要算法:
            rid = 0;//记录ID
            rtxtNew.Text = "|";
            string tmptxt;
            for (int i=0;i<rtxtOld.Lines.Length;i++)
            {
                tmptxt=rtxtOld.Lines[i];
                if (tmptxt.Trim() != "" || tmptxt.Trim() != "Change History:")//去掉不需要部分
                {
                    if (tmptxt.IndexOf('/') == 2)//日期和作者
                    {
                        rtxtNew.Text += "/n/n|Change ID:/t/t" + rid + "/n";
                        rid++;
                        int t;
                        string wttmp;
                        t = tmptxt.IndexOf(',');
                        wttmp = tmptxt.Substring(0, t);
                        rtxtNew.Text += "|Changed Date:/t/t" + wttmp + "/n";
                        wttmp = tmptxt.Substring(t + 2);
                        rtxtNew.Text += "|Changed By:/t/t" + wttmp + "/n";

                        continue;
                    }
                    else if (tmptxt.IndexOf('*') != -1)//介绍
                    {
                        int t;
                        string wttmp;
                        t = tmptxt.IndexOf('*');
                        wttmp = tmptxt.Substring(t + 3);
                        rtxtNew.Text += "|Summary:/t/t" + wttmp.Trim();

                        continue;
                    }
                    else if (tmptxt.IndexOf(':') != -1)//字段
                    {
                        rtxtNew.Text += "/n|" + tmptxt.Substring(0, tmptxt.IndexOf(':') + 1).Trim() + "/t/t" + tmptxt.Substring(tmptxt.IndexOf(':') + 1).Trim();
                    }
                    else if (tmptxt.IndexOf(':') == -1 && tmptxt.IndexOf('/') == -1 && tmptxt.IndexOf('*') == -1)
                    {
                        rtxtNew.Text += tmptxt.Trim();
                        continue;
                    }
                }
                else
                    continue;
            }