io_helper.cc

#include "io_helper.h"

/**
 * @fn bool fline_tr(ifstream* fin, vector <string> fields, string delim)

 * Retrieve a line from fin using delimiters in delim, and trim all strings retrieved.
 *
 *	Removed Empty (after trimmed) spaces.
 * @param fin File stream to read from
 * @param fields Container to put results
 * @param delim Delimiters to use
 * @return if line retrieval was successful
 */

bool fline_tr(ifstream *fin, vector<string> *fields, string delim) {
    fields->clear();
    vector<string>::iterator p, q;

    string full;
    getline(*fin, full);

    if (fin->fail() && fin->eof())
        return false;

    char *pt = strtok((char *) (full.c_str()), delim.c_str());
    while (pt != NULL) {
        fields->emplace_back(pt);
        pt = strtok(NULL, delim.c_str());
    }

    for (p = fields->begin(); p != fields->end(); p++) {
        while (trim(*p).compare("") == 0 && p != fields->end()) {
            q = p;
            fields->erase(q);
        }

        if (p == fields->end())
            break;

        *p = trim(*p);
    }

    return true;
}

/** @fn void split_tr(vector <string>* fields, string delim)
 *
 */
void split_tr(string input, vector<string> *fields, string delim) {
    vector<string>::iterator p, q;

    fields->clear();

    char *pt = strtok((char *) (input.c_str()), delim.c_str());
    while (pt != NULL) {
        fields->emplace_back(pt);
        pt = strtok(NULL, delim.c_str());
    }

    for (p = fields->begin(); p != fields->end(); p++) {
        while (trim(*p).compare("") == 0 && p != fields->end()) {
            q = p;
            fields->erase(q);
        }

        if (p == fields->end())
            break;

        *p = trim(*p);
    }
}

/**
 * @fn bool openFile(ifstream* fin, string filename)
 *
 * Open an ifstream with some basic checks
 *
 * @param fin ifstream to use to open file
 * @param filename file to open
 * @return if open successful
 */
bool openFile(ifstream *fin, string filename) {
    fin->open(filename.c_str());
    if (!(fin->is_open())) {
        return false;
    }

    return true;
}

/**
 * @fn bool openFileHarsh(ifstream* fin, string filename)
 *
 * Open an ifstream with some basic checks. If the file is not
 *    opened, the program is exited. If error handling is 
 *    desired, use 'openFile'.
 *
 * @param fin ifstream to use to open file
 * @param filename file to open
 */
void openFileHarsh(ifstream *fin, string filename) {
    fin->open(filename.c_str());
    if (!(fin->is_open())) {
        FileError(filename);
        exit(3);
    }
}


void FileError(const string &filename) {
    cerr << "Could not open file " << filename << endl;
}