filter.cs

1）C++源代码扫描程序识别C++记号。 C++语言包含了几种类型的记号：标识符

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Text.RegularExpressions;

namespace Scanner
{
    public class Filter
    {
        public void Seperator(string path, ref string number, ref string identifier, ref string keyword, ref string comment,ref string importan)
        {
            StringBuilder bimportan = new StringBuilder();
            bimportan.Append("程序存在的全局标识：");
            bimportan.Append("\r\n");
            StringBuilder bnumber = new StringBuilder();
            bnumber.Append("源文件中存在的操作数字：");
            bnumber.Append("\r\n");
            StringBuilder bidentifier = new StringBuilder();
            bidentifier.Append("源文件中存在的标识符：");
            bidentifier.Append("\r\n");
            StringBuilder bkeyword = new StringBuilder();
            bkeyword.Append("源文件中存在的关键字：");
            bkeyword.Append("\r\n");
            StringBuilder bcomment = new StringBuilder();
            bcomment.Append("源文件中存在的注释：");
            bcomment.Append("\r\n");
            using (StreamReader sr = new StreamReader(path, System.Text.Encoding.Default))
            {
                try
                {
                    while (sr.Peek() != -1)
                    {
                        string realcontent;
                        string temp = sr.ReadLine().Trim();
                        if (temp.IndexOf("#") != -1)
                        {
                            bimportan.Append(temp);
                            bimportan.Append("\r\n");
                            continue;
                        }
                        if (temp.IndexOf("//") != -1)
                        {
                            if (temp.IndexOf("//{{") != -1 || temp.IndexOf("//}}") != -1)
                            {
                                bimportan.Append(temp);
                                bimportan.Append("\r\n");
                                realcontent = "";
                            }
                            else if (temp.IndexOf("////") != -1)
                            {
                                realcontent = "";
                            }
                            else
                            {
                                realcontent = temp.Substring(0, temp.IndexOf("//")).Trim();
                                bcomment.Append(temp.Remove(0, temp.IndexOf("//") + 2));
                                bcomment.Append("\r\n");
                            }
                        }
                        else
                        {
                            realcontent = temp;
                        }
                        if (realcontent != "")
                        {
                            string[] array = Split(realcontent);
                            foreach (string s in array)
                            {
                                if (CheckNumber(s.Trim()))
                                {
                                    if (bnumber.ToString().IndexOf(s) == -1)
                                    {
                                        bnumber.Append(s);
                                        bnumber.Append(',');
                                    }
                                }
                                if (CheckKeyword(s.Trim()))
                                {
                                    if (bkeyword.ToString().IndexOf(s) == -1)
                                    {
                                        bkeyword.Append(s);
                                        bkeyword.Append(',');
                                    }
                                }
                                if (CheckIndentifer(s.Trim()))
                                {
                                    if (bidentifier.ToString().IndexOf(s) == -1)
                                    {
                                        bidentifier.Append(s);
                                        bidentifier.Append(',');
                                    }
                                }
                            }
                        }                      
                    }
                    bnumber.Append("\r\n");
                    bidentifier.Append("\r\n");
                    bkeyword.Append("\r\n");
                    number = bnumber.ToString();
                    identifier = bidentifier.ToString();
                    keyword = bkeyword.ToString();
                    comment = bcomment.ToString();
                    importan = bimportan.ToString();
                }
                catch (IOException ex)
                {
                    throw ex;
                }
            }
        }
        private string[] Split(string input)
        {
            input.Replace(';', ' ');
            input.Replace('(', ' ');
            input.Replace(')', ' ');
            input.Replace("->", " ");
            input.Replace('*', ' ');
            input.Replace(',', ' ');
            input.Replace('{', ' ');
            input.Replace('}', ' ');
            input.Replace('<', ' ');
            input.Replace('>', ' ');
            input.Replace('=', ' ');
            input.Replace('-', ' ');
            input.Replace('+', ' ');
            input.Replace("\\"," ");
            input.Replace('%', ' ');
            input.Replace("&&", " ");
            input.Replace("||", " ");
            input.Replace('&', ' ');
            input.Replace('|', ' ');
            input.Replace('~', ' ');
            input.Replace('^', ' ');
            char[] space = new char[] { ' ', ' ' };
            string[] content = input.Split(space,StringSplitOptions.RemoveEmptyEntries);
            return content;
        }

        private bool CheckNumber(string input)
        {
            string numregex = @"^(-?[0-9]*[.]*[0-9]{0,4})$";
            return IsRegEx(numregex, input);

        }

        private bool CheckKeyword(string input)
        {
            bool flag = false;
            switch (input)
            {
                case "virtual":
                case "auto":
                case "asm":
                case "break":
                case "bool":
                case "case":
                case "char":
                case "class":
                case "const":
                case "continue":
                case "default":
                case "delete":
                case "do":
                case "double":
                case "else":
                case "enum":
                case "extern":
                case "explicit":
                case "float":
                case "friend":
                case "for":
                case "goto":
                case "if":
                case "int":
                case "inline":
                case "mutable":
                case "operator":
                case "long":
                case "new":
                case "namespace":
                case "private":
                case "protected":
                case "public":
                case "register":
                case "return":
                case "short":
                case "signed":
                case "sizeof":
                case "static":
                case "struct":
                case "switch":
                case "template":
                case "this":
                case "throw":
                case "typedef":
                case "typeid":
                case "typename":
                case "union":
                case "unsigned":
                case "void":
                case "volatile":
                case "while":
                case "wchar_t":
                case "include":
                case "try":
                case "catch":
                case "finally":
                    flag = true;
                    break;
                default:
                    flag = false;
                    break;
            }
            return flag;
        }

        private bool CheckIndentifer(string input)
        {
            bool flag = false;
            char[] array = input.ToCharArray();
            if ((array[0] >= 'a' && array[0] <= 'z') || (array[0] >= 'A' && array[0] <= 'Z') || array[0] == '_')
            {
                flag = true;
            }
            if (flag&&array.Length>1)
            {
                for (int i = 1; i < array.Length; i++)
                {
                    if ((array[i] >= 'a' && array[i] <= 'z') || (array[i] >= 'A' && array[i] <= 'Z') || array[i] == '_' || (array[i] >= 0 && array[i] <= 9))
                    {
                        flag = true;
                    }
                    else
                    {
                        flag = false;
                        break;
                    }
                }
            }
            if (flag)
                flag = !CheckKeyword(input);
            return flag;
        }

        private bool IsRegEx(string regExValue, string itemValue)
        {
            bool flag = false;
            try
            {
                Regex regex = new Regex(regExValue);
                if (regex.IsMatch(itemValue))
                    flag = true;
            }
            catch (Exception e)
            {
                throw e;
            }
            return flag;
        }
    }
}