accidenceanalyzer.cpp

Accidence Analyzer

#include <afx.h>
#include <iostream.h>
#include <string.h>
#include <conio.h>

//显示菜单选项函数
void Display()
{
cout<<endl<<endl<<"Option to choose:"<<endl;
cout<<"**********************************************"<<endl;
cout<<"(1).Display the Num-Word table"<<endl;                     //显示内部定义单词种别码表
cout<<"(2).Display the Sample and the Analysis result"<<endl;     //显示样板代码和分析结果
cout<<"(3).Quit"<<endl;                                           //退出
cout<<"**********************************************"<<endl;
cout<<"Please choose the function(1~3):";
}

//对样板每行字符串进行词法分析函数
void Analyze(CString &LineStr)       //形参LineStr接收调用函数传来的每一行的字符串
{
    int i,j;                         //i为循环变量，j为字符串word的字符指针
	CString str1,word;               //str1记录种别码文件每行字符串，word记录被分解出的单词
	char ch;                                                       //ch记录每读进的一个字符
	bool flag=false;                         //flag标识关系运算符为双字符(如<=)或单字符(如<)
	CStdioFile MyFile1;
    MyFile1.Open("key.txt",CFile::modeRead|CFile::typeText);       //key.txt为单词种别码文件
	for(i=0,j=0;i<=LineStr.GetLength();i++)                        //循环读每行字符串的字符
    {
	   if(i!=LineStr.GetLength()) ch=LineStr.GetAt(i);
	   //若刚遇到双字符关系运算符，读入新字符后跳出当前循环
	   if(flag)
	   {
		   word.Insert(j++,ch);
		   flag=false;
		   continue;
	   }
	   //若读入的是数字，且前面读到的是字母或数字，把数字加入到word中
	   if(ch>=48&&ch<=57&&(word.Right(1)>=48&&word.Right(1)<=57||word.Right(1)>=97&&word.Right(1)<=122)) 
	   {
		   word.Insert(j++,ch);
		   continue;
	   }
	   //若读入的不是数字，且前面读到的都是数字，把word输出，清空word,归入常量种类中
	   if(word.Left(1)>=48&&word.Left(1)<=57&&word.Right(1)>=48&&word.Right(1)<=57) 
	   {
		   cout<<"(22,\""<<word<<"\")"<<"\t";
	       j=0;
	       word.Empty();
	   }
	   //若读入的是字母，且前面读到的是字母，把字母加入到word中
	   if(ch>=97&&ch<=122&&word.Right(1)>=97&&word.Right(1)<=122)
	   {
		   word.Insert(j++,ch);
	       continue;
	   }
	   //若前面读到<,>,=,读入的字符是=,加入到word中，flag为真
	   if((word=="<"||word==">"||word=="=")&&ch=='=') 
	   {
		   word.Insert(j++,ch);
		   flag=true;
	   }
	   /*循环读入种别码文件的每一行，与word比较，若找到相同的字符串，
	   输出编号和word,清空word*/
	   while(MyFile1.ReadString(str1))                                 
		  if(word.Compare(str1.Mid(3))==0)                             
		  {                                                            
		     cout<<"("<<str1.Mid(0,2)<<",\""<<word<<"\")"<<"\t";       
		     word.Empty();                                             
		     j=0;
             break;
		  }
	   MyFile1.SeekToBegin();                                        //文件指针返回头部
	   /*若在种别码文件中找不到相同的字符串，且word以字母开头，
	   把word归为变量种类输出，清空word*/
	   if(word!=""&&word.Left(1)>=97&&word.Left(1)<=122)
		  {
			  cout<<"(21,\""<<word<<"\")"<<"\t";
		      j=0;
		      word.Empty();
		  }
	   //若不是以字母开头，把word归为错误字符输出，清空word
	   else if(word!="") 
	   {
		   cout<<"Error,\""<<word<<"\""<<"\t";
		   j=0;
		   word.Empty();
	   }
	   //把新读入字符加入word中
	   if(!flag&&ch!=' ') 
	   	   word.Insert(j++,ch);
   	}
	MyFile1.Close();
}
void main()
{
	CString str;             //str记录文件中每一行字符串
	int i=0;                 //i用于控制输出格式
	char ch;                 //ch记录所选择的功能编号
	CStdioFile MyFile;
    while(true)
	{
	Display();
    cin>>ch;
	switch(ch)
	{
	case '1':                //输出自定义种别码文件
		MyFile.Open("key.txt",CFile::modeRead|CFile::typeText);
        cout<<endl<<"Num-Word Table:"<<endl;
		while(MyFile.ReadString(str))
		{
			i++;
			cout<<str<<"\t\t";
		    if(i%2==0) cout<<endl;
		}
		i=0;
		MyFile.Close();
		break;
	case '2':                //输出样板文件和词法分析结果
		MyFile.Open("sample.txt",CFile::modeRead|CFile::typeText);
        cout<<endl<<"The Content of Sample:"<<endl;
	    cout<<"###########################"<<endl;
  	    while(MyFile.ReadString(str))
           cout<<str<<endl;
 	    cout<<"###########################"<<endl;
	    MyFile.SeekToBegin();
		cout<<"Press any key to see the result..."<<endl;
		getch();
        cout<<endl<<"Accidence Analyze Result:"<<endl;
	    while(MyFile.ReadString(str))
	       Analyze(str);
		MyFile.Close();
		break;
	case '3':                //退出系统
		exit(0);
		break;
	default:
		cout<<"Please type in the right function number!"<<endl;
	}
	}
}