form1.cs

一个自己制作的词法分析器

                else if (inText.Substring(end, 1).Equals(" ")&end!=0)//判断当前字符是否为空格并且不为程序开头
                {
                    if (!inText.Substring(end - 1, 1).Equals(" "))//判断前一个字符是否为空格，如不是，则将当前start到end的字符存入数组
                    {
                        resultArr[wordCount,0] = inText.Substring(start, end - start);
                        wordCount++;
                        end++;
                        start = end;
                        continue;
                    }
                    else//如前一个字符也为空格，将end+1,start指向end
                    {
                        end++;
                        start = end;
                        continue;
                    }
                }
                else if (inText.Substring(end, 1).Equals(" ") & end == 0)//判断当前字符是否为空格并且为程序开头
                {
                    end++;
                    start = end;
                    continue;
                }
                else if (end == start)//如果end和start位置相同
                {
                    if (end < inText.Length - 1)//判断当前end位置是否已经是在倒数第二个字符，如果不是则按下面处理
                    {
                        end++;
                        if (inText.Substring(end, 1).Equals("="))//判断end后一个字符是否为等号，如是将等号与前一个字符一起存入数组
                        {
                            end++;
                            resultArr[wordCount,0] = inText.Substring(start, end - start);
                            wordCount++;
                            start = end;
                            continue;
                        }
                        else if (inText.Substring(end, 1).Equals(" "))//如end后一个字符是空格，将当前字符存入数组，将end与start定位到空格之后                                         
                        {                                             //避免当end=start，end指向空格时，由于end前一字符不为空而将空串存入数组
                            end++;
                            resultArr[wordCount,0] = inText.Substring(start, end - start - 1);
                            wordCount++;
                            start = end;
                            continue;
                        }
                        else//否则则只将当前字符存入数组
                        {
                            resultArr[wordCount,0] = inText.Substring(start, 1);
                            wordCount++;
                            start = end;
                            continue;
                        }
                    }
                    else//如果是倒数第二个字符则将最后一个字符存入数组即可
                    {
                        resultArr[wordCount,0] = inText.Substring(end, 1);
                        wordCount++;
                        end = inText.Length + 1;
                    }
                }
                else if (end != start)//将start与end不相等，则将start到end字符存入数组
                {
                    resultArr[wordCount,0] = inText.Substring(start, end-start);
                    wordCount++;
                    start=end;
                    continue;
                }
            }
        }
        public void Print()//输出结果
        {
            for (int i = 0; i < wordCount; i++)
            {
                dr = dt.NewRow();
                dr["Word"] = resultArr[i,0];
                dr["Class"] = resultArr[i, 1];
                dr["Kind"] = resultArr[i, 2];
                dt.Rows.Add(dr);
                outText += resultArr[i, 0] + "," + resultArr[i, 1] + "," + resultArr[i, 2] + "\r\n";
            }
            dataGridView1.DataSource = dt;
        }
        public void Matching()//匹配数组结果
        {
            int flag = 0;
            for (int i = 0; i < wordCount; i++)
            {
                flag = 0;
                for (int a = 0; a < 13; a++)
                {
                    if (resultArr[i, 0] == pw.primaryword[a, 0])
                    {
                        resultArr[i, 1] = "1";
                        resultArr[i, 2] = pw.primaryword[a, 1];
                        flag = 1;
                        break;
                    }
                }
                if (flag == 1) continue;
                for (int b = 0; b < 7; b++)
                {
                    if (resultArr[i, 0] == dl.delimiter[b, 0])
                    {
                        resultArr[i, 1] = "4";
                        resultArr[i, 2] = dl.delimiter[b, 1];
                        flag = 1;
                        break;
                    }
                }
                if (flag == 1) continue;
                for (int c = 0; c < 10; c++)
                {
                    if (resultArr[i, 0] == op.operato[c, 0])
                    {
                        resultArr[i, 1] = "5";
                        resultArr[i, 2] = op.operato[c, 1];
                        flag = 1;
                        break;
                    }
                }
                if (flag == 1) continue;
                for (int d = 0; d < constCount; d++)
                {
                    if (resultArr[i, 0] == cv.constval[d, 0])
                    {
                        resultArr[i, 1] = "2";
                        resultArr[i, 2] = cv.constval[d, 1];
                        flag = 1;
                        break;
                    }
                }
                if (flag == 1) continue;
                for (int e = 0; e < varCount; e++)
                {
                    if (resultArr[i, 0] == vv.varval[e, 0])
                    {
                        resultArr[i, 1] = "3";
                        resultArr[i, 2] = vv.varval[e, 1];
                        flag = 1;
                        break;
                    }
                }
                if (flag == 1) continue;
                else
                {
                    if ((char.IsLetter(resultArr[i, 0], 0)))
                    {
                        resultArr[i, 1] = "3";
                        resultArr[i, 2] = (varCount + 1).ToString();
                        vv.varval[varCount, 0] = resultArr[i, 0];
                        vv.varval[varCount, 1] = (varCount + 1).ToString();
                        varCount++;
                        continue;
                    }
                    else if (char.IsDigit(resultArr[i, 0], 0))
                    {
                        int f = 0;
                        for (int x = 1; x < resultArr[i, 0].Length; x++)
                        {
                            if (!(char.IsDigit(resultArr[i, 0], x)))
                            {
                                f = 1;
                                break;
                            }
                        }
                        if (f == 0)
                        {
                            resultArr[i, 1] = "2";
                            resultArr[i, 2] = (constCount + 1).ToString();
                            cv.constval[constCount, 0] = resultArr[i, 0];
                            cv.constval[constCount, 1] = (constCount + 1).ToString();
                            constCount++;
                            continue;
                        }
                        else
                        {
                            resultArr[i, 1] = "error";
                            resultArr[i, 2] = "error";
                            continue;
                        }
                    }
                    else
                    {
                        resultArr[i, 1] = "error";
                        resultArr[i, 2] = "error";
                        continue;
                    }

                }
            }
        }

    }
}