changegrammar.cpp

来自「C编译器」· C++ 代码 · 共 35 行

#include "parse.h"

//void changeGrammar()
int main()
{
	ifstream inf( "grammar.txt" );
	ofstream outf( "grammar_changed.txt" );

	if( !inf ) cout << "Cannot open the source grammar file!";
	else if( !outf ) cout << "Cannot open the aim grammar file";

	else 
	{
		string str,left,prestr;
		while( inf >> str )
		{			
			//next = inf.peek();cout<<next;
			if( str == "→" ) 
			{
				left = prestr;
				outf <<str<<" ";
			}
			else if( str == "|" )
			{
				outf << "\n";
				outf << left << " " << "→" << " ";
				inf.seekg(1,ios_base::cur );
			}
			else if(str =="#" ) outf <<"\n";
			else outf << str<<" ";
			prestr = str;
		}
	}
	return 0;
}