scaner.cpp

一个扫描程序

//*******************************************************************************************
// scaner.cpp : Defines the entry point for the console application.
//	扫描C++源程序，给出其中的常量、变量和函数列表，包括出现位置（行号）、定义性/使用性出现、
//类型（函数给出行参类型和返回值类型），最终判断是否满足"先定义后使用"原则。
//written by 束文辉(031251096).
//*******************************************************************************************
#include "stdafx.h"
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
void printhead();
void openfile(ifstream&);
void findfunction(string);
string sample;

void finddata(string);
bool statement=false;
string filename;
//********************************************************************************************
int main(int argc, char* argv[])
{	printhead();
	
	cout<<"Please input file name:"<<endl;
	cin>>filename;
	cout<<"const and variable:"<<endl;
	finddata("int");
	finddata("float");
	finddata("long");
	finddata("double");
	finddata("short");
	finddata("string");
	finddata("long double");
	finddata("char");
	finddata("bool");

	cout<<endl<<endl<<"function:"<<endl;
	findfunction("void");
	findfunction("int");
	findfunction("char");
	findfunction("float");
	findfunction("long");
	findfunction("double");
	findfunction("short");
	findfunction("long double");
	findfunction("bool");

	return 0;
}
//*********************************************************************************************
void printhead()
{	cout<<"********************programme for scanning the file***********************"<<endl;
	cout<<"***********************welcome to scan programme**************************"<<endl;
}
//*********************************************************************************************
void openfile(/*inout*/ifstream& somefile)
{	
	somefile.open(filename.c_str());
	if(!somefile)
		cout<<"can not open "<<filename<<endl;
}
//*********************************************************************************************
void finddata(string type)
{	int len;
	int len2;
	int count(1);
	ifstream file;
	openfile(file);
	string sub;
	string sub2;
	string sub3;
	int ifcon(0);
	bool ifconst=true;
	bool ifannounce=false;
	bool array=false;
	int ads(0);
	int count2=0;
	int count3=1;
	int ads2;
	len2=type.length();
	getline(file,sample);
	while(file)
	{	
		len=sample.length();
		count++;
		
		for(int i=0;i<len-len2;i++)
		{
			sub=sample.substr(i,len2);
			sub3=sample.substr(i+len2,1);
		
			if(sub==type&&sub3==" ")
			{ads=i;
			ads2=i;
			if(i>5)
				ifcon=i-6;
			for(int j=0;j<ifcon;j++)//judge if is const
				{	sub2=sample.substr(ifcon,5);
					if(sub2=="const")
						ifconst=true;
				}
			for(;ads<len;ads++)
				{	if(sample[ads]==';')
					{	if(sample[ads-1]==')')
						ifannounce=true;
					}
				
				}
			if(sample[ads-1]==';')
				statement=true;
			if(sample[ads-2]==']')
				array=true;
			if(ifannounce)
				{for(int k=0;k<ads;k++)
					{if(sample[k]==',')
						count2++;//how many paramenter there is in a funtion	
					}
				}
				if(statement)
				{if(!ifannounce)
					{	for(int l=0;l<ads;l++)
						{if(sample[l]==',')
							count3++;//see a type has how many paramenter
						}
					if(ifconst)
					{	if(array)
						{		cout<<"const "<<type<<" array"<<sample.substr(i+len2,ads-1)<<endl;
						
							if(count3==1)	
							cout<<"			There "<<"is "<<count3<<" "<<type<< " array in line:"<<count<<endl;
							else
							cout<<"			There "<<"are "<<count3<<" "<<type<<"s"<< " arrays in line:"<<count<<endl;
						}
						else
						{	
							cout<<"const "<<type<<" "<<sample.substr(i+len2,ads-1)<<endl;
							if(count3==1)	
							cout<<"			There "<<"is "<<count3<<" const "<<type<< " in line:"<<count<<endl;
							else
							cout<<"			There "<<"are "<<count3<<" const "<<type<<"s"<< " in line:"<<count<<endl;
						}
					}
					else
						{	if(array)
							{
								cout<<type<<" array"<<sample.substr(i+len2,ads-3)<<endl;
								if(count3==1)	
								cout<<"			There "<<"is "<<count3<<" "<<type<< " array  in line:"<<count<<endl;
								else
								cout<<"			There "<<"are "<<count3<<" "<<type<<"s"<< " arrays  in line:"<<count<<endl;
							}
							else
							{
								cout<<type<<" "<<sample.substr(i+len2,ads-3)<<endl;
								if(count3==1)	
								cout<<"			There "<<"is "<<count3<<" "<<type<< "  in line:"<<count<<endl;
								else
								cout<<"			There "<<"are "<<count3<<" "<<type<<"s"<< "  in line:"<<count<<endl;
							}
						}
					}
				}
			}
				ifannounce=false;
				ifconst=false;
				statement=false;
				 ifcon=0;
				
				ads=0;
				 count2=0;
				 count3=1;
		}
			getline(file,sample);
	}
	file.close();
}
//*********************************************************************************************
void findfunction(string type)
{	int leng;
	int leng2;
	int leng3;
	int countf(1);
	bool ifannounce=false;
	bool iffind=false;
	bool def=false;
	int ads=0;
	int ads2=0;
	string sub3;
	ifstream file2;
	string sub;
	string sub2;
	string sub4;
	string sub5;
	string sub6;
	file2.open(filename.c_str());
	if(!file2)
		cout<<"can not open "<<filename<<endl;;
	getline(file2,sample);
	while(file2)
		{	leng=sample.length();
			countf++;
			leng2=type.length();
			
			for(int i=0;i<leng-leng2;i++)
			{
				sub=sample.substr(i,leng2);
				sub6=sample.substr(i+leng2,1);
				if(sub==type&&sub6==" ")
				{	ads=i;
					if(sample[leng-1]==')')
						iffind=true;
					if(iffind)//find the function
					{	for(int j=0;j<leng;j++)//find the paramenter
						{if(sample[j]=='(')
							ads2=j;
						 
						}
						sub2=sample.substr(ads2+1,leng-2-ads2);
						for(int k=0;k<leng-ads2-2;k++)
						{if(sub2[k]==';')
							iffind=false;
						}
					}
					if(iffind)
					{	sub4=sample.substr(leng2+1,ads2-leng2-1);
						
						for(int l=1;l<countf-1;l++)//to see if define later
						{	ifstream file3;
							file3.open(filename.c_str());
							if(!file3)
								cout<<"can not"<<endl;
							getline(file3,sub3);
							leng3=sub3.length();
							for(int m=0;m<leng3-ads2+leng2+1;m++)
							{	sub5=sub3.substr(m,ads2-leng2-1);
								if(sub4==sub5)
									def=true;
							}
														
						}
					}
				
				if(ads>=ads2-3)
					iffind=false;
					if(iffind)
					{cout<<type<<sample.substr(leng2,ads2-leng2)<<"      in line "<<countf<<endl;
						cout<<"				its return type: "<<type<<endl;
						cout<<"				its paramenters : ";
						if(sub2=="")
							cout<<"none"<<endl;
						else 
							cout<<sub2<<endl;
						if(!def)
							cout<<"				it is defined first and used later..."<<endl;
						else 
							cout<<"				it is not defined first and used later..."<<endl;

					}


				}
				ifannounce=false;
				iffind=false;
				def=false;
				ads=0;
				ads2=0;
			}
			getline(file2,sample);
		}
	file2.close();
}