114 lines
2.3 KiB
C++
114 lines
2.3 KiB
C++
/*
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* This file is part of the Owl Positioning System (OwlPS).
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* OwlPS is a project of the University of Franche-Comté
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* (Université de Franche-Comté), France.
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*/
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#include "textfilereader.hh"
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#include "posexcept.hh"
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#include <iostream>
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using namespace std ;
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/* *** Constructors *** */
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/**
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* @param _file_name The name of the file to open.
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* @throw error_opening_input_file if the file cannot be opened.
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*/
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TextFileReader::TextFileReader(const string &_file_name):
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file_name(_file_name), current_line_nb(0)
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{
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if (file_name == "-")
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{
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file_buf = file.rdbuf() ;
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file.std::ios::rdbuf(std::cin.rdbuf()) ;
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}
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else
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{
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file.open(file_name.c_str()) ;
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if (! file)
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throw error_opening_input_file(file_name) ;
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}
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}
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TextFileReader::~TextFileReader()
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{
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if (file_name == "-")
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file.std::ios::rdbuf(file_buf) ;
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else
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file.close() ;
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}
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/* *** Operations *** */
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/**
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* Blank lines or lines containing only blank characters are skipped.
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* Tabs and spaces at the begining of a line are deleted.
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* If the first non-blank character of a line is a #, then the line is
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* skipped (note that comments at the end of a line are *not* handled).
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* @param text Output argument; unchanged in case of error.
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* @return \em false in case of error, \em true else.
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*/
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bool TextFileReader::read_nonblank_line(string &text)
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{
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string line ;
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string::size_type first_non_blank = 0 ;
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do
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if (! read_line(line))
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return false ;
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while ((first_non_blank = line.find_first_not_of(" \t"))
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== string::npos || line.at(first_non_blank) == '#') ;
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line.erase(0, first_non_blank) ;
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text = line ;
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return true ;
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}
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/**
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* @return The string read, or an empty string in case of error.
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*/
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bool TextFileReader::read_line(string &text)
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{
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if (eof_close())
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return false ;
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getline(file, text) ;
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++current_line_nb ;
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return true ;
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}
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/**
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* Tests if #file is opened and there is something more to
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* read. If the end of file is reached, the stream is closed.
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* @return \em true if the end of file is reached or if the file is
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* already closed.
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* @return \em false if there is something more to read.
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*/
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bool TextFileReader::eof_close()
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{
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if (file)
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return false ;
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if (file.eof())
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{
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file.close() ;
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return true ;
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}
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return false ;
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}
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