122 lines
2.8 KiB
C++
122 lines
2.8 KiB
C++
/*
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* This file is part of the Owl Positioning System (OwlPS) project.
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* It is subject to the copyright notice and license terms in the
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* COPYRIGHT.t2t file found in the top-level directory of this
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* distribution and at
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* https://code.lm7.fr/mcy/owlps/src/master/COPYRIGHT.t2t
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* No part of the OwlPS Project, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms
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* contained in the COPYRIGHT.t2t file; the COPYRIGHT.t2t file must be
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* distributed along with this file, either separately or by replacing
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* this notice by the COPYRIGHT.t2t file's contents.
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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[out] text Output argument; unchanged in case of error.
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* @returns `false` in case of error, `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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* @param[out] text The string read.
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* @returns `true` in case of success, `false` 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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* @returns `true` if the end of file is reached or if the file is
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* already closed.
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* @returns `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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