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/*
Gordon's Text-Utilities Library
Copyright (C) 2009 Assaf Gordon (gordon@cshl.edu)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#include <err.h>
#include <iostream>
#include <string>
#include <gtextutils/stream_wrapper.h>
#include <gtextutils/text_line_reader.h>
#include "tests_assertion.h"
using namespace std;
int main()
{
InputStreamWrapper input("test.txt");
TextLineReader reader ( input.stream() );
string line ;
//Read first line
ASSERT ( reader.next_line() );
line = reader;
ASSERT( line == "first line" ) ;
//Unget the current line -
//The next call to 'reader.next_line' should return this SAME line
//instead of actually reading the next line from the file.
reader.unget_current_line();
//Read the next line -
//but because of the 'unget' it should still return the first line
ASSERT ( reader.next_line() ) ;
line = reader ;
ASSERT( line == "first line" ) ;
ASSERT ( reader.line_number() == 1 ) ; //we should still be on line 1
//Read the next line -
//This should be the real second line from the file.
ASSERT ( reader.next_line() ) ;
line = reader;
ASSERT ( line == "second line" );
ASSERT ( reader.line_number() == 2 ) ;
//Test multiple consecutive ungets
for ( int i=0 ; i < 10; ++i ) {
reader.unget_current_line();
ASSERT ( reader.next_line() ) ;
line = reader;
ASSERT ( line == "second line" );
ASSERT ( reader.line_number() == 2 ) ;
}
//Read the next line -
//This should be the real third line from the file.
ASSERT ( reader.next_line() ) ;
line = reader;
ASSERT ( line == "third line" );
ASSERT ( reader.line_number() == 3 ) ;
//Unget a custom line string
reader.unget_line("hello world");
//Read the next line - this should return the ungot text ("hello world")
ASSERT ( reader.next_line() ) ;
line = reader;
ASSERT ( line == "hello world" );
return 0;
}
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