main.cpp

这是编译原理编译器中的一部分

#include <iomanip>

#include "parse.h"
#include "read.h"
#include "make.h"

ifstream grammarfile;
DVec_str productions;
vector<string> terminals;
vecNter nonterminals;
DVec_int table;
vector< string> vec ;

stack<string> parseStack;
vector<string> inputStr;

int main()
{
     ofstream outf( "set.txt" );

	 if( !outf )cout << "Cannot open the file : first.txt\n ";

	 else{
		 readGrammar();
	     makeFirstSet();

		 outf<<"The First Set:\n";
	     for(size_t i = 0;i < nonterminals.size();i++)
	    {
			outf << "First( "<<nonterminals[i].token<<" )" << "= { ";
			size_t j;
		    for( j = 0;j < nonterminals[i].first.size() - 1;j++)
				outf << nonterminals[i].first[j]<<",";
			outf<<nonterminals[i].first[j]<<" }\n";
		 }

		 makeFollowSet();
		 outf<<"\n\n\nThe Follow Set:\n";
		 for(size_t i = 0;i < nonterminals.size();i++)
	    {
			outf << "Follow( "<<nonterminals[i].token<<" )" << "= { ";
			size_t j;
			for( j = 0;j < nonterminals[i].follow.size() - 1;j++)
				outf << nonterminals[i].follow[j]<<",";
			outf<<nonterminals[i].follow[j]<<" }\n";
		 }

		 makeTable();
		 cout<<setw(10)<<"M[N,T]";
		 for(int i = 0;i < (int)terminals.size();i++ )
		 {
			 if(terminals[i] != "ε" )cout<<setw(8)<<terminals[i];
		  }
		 cout<<setw(8)<<"$";

		 cout <<endl;
		 for( int i = 0;i < (int)table.size();i++ )
		 {
			 cout<<setw(10)<<nonterminals[i].token;
			 for( int j = 0;j < (int)table[i].size();j++ )
			 {
				 if( table[i][j] != -1 )
					 cout<<setw(8)<<table[i][j];
				 else
					 cout<<setw(8)<<" ";
			 }
			 cout<<endl;
		 }

	 parseTable();
	 }
	 return 0;
}