NEW: Added new class CSVReader.

src/CSVReader/CSVReader.cpp

@@ -2,4 +2,95 @@
 // Created by martin on 14.11.18.
 //
 
+#include <string>
+#include <fstream>
+#include <sstream>
+
 #include "CSVReader.h"
+
+namespace lib4neuro {
+    CSVReader::CSVReader(std::string file_path, std::string delimiter, bool ignore_first_line) {
+        this->file_path = file_path;
+        this->delimiter = delimiter;
+        this->ignore_first_line = ignore_first_line;
+        this->header_included = ignore_first_line;
+        this->data = new std::vector<std::vector<std::string>>;
+    }
+
+    void CSVReader::read() {
+        std::ifstream ifs(this->file_path);
+        std::string line;
+
+        if(this->ignore_first_line) {
+            std::getline(ifs, line);
+        }
+
+        /* Read single line from the file */
+        while(std::getline(ifs, line)) {
+            /* Ignore empty line */
+            if(line == "") {
+                continue;
+            }
+
+            /* Separate elements of the line according to the delimiter */
+            size_t last = 0;
+            size_t next = 0;
+            std::vector<std::string> separated_line;
+            while ((next = line.find(this->delimiter, last)) != std::string::npos) {
+                separated_line.emplace_back(line.substr(last, next - last));
+                last = next + 1;
+            }
+            separated_line.emplace_back(line.substr(last));
+
+            /* Store the elements from the line to the vector with data */
+            this->data->emplace_back(separated_line);
+        }
+
+        ifs.close();
+    }
+
+    std::vector<std::vector<std::string>>* CSVReader::get_data() {
+        return this->data;
+    }
+
+    void CSVReader::print_data() {
+        for(auto line : *this->data) {
+            for(auto e : line) {
+                std::cout << e << " ";
+            }
+            std::cout << std::endl;
+        }
+    }
+
+    DataSet CSVReader::get_data_set(std::vector<unsigned int>* input_col_indices,
+                                    std::vector<unsigned int>* output_col_indices) {
+
+        std::vector<std::pair<std::vector<double>, std::vector<double>>> data_set_contents;
+
+        int i = 0;
+        for(auto line : *this->data) {
+
+            std::cout << i++ << std::endl;
+
+            //TODO check for non-numerical (or empty) values in data
+            std::vector<double> input;
+            for(auto ind : *input_col_indices) {
+                input.push_back(std::stod(line.at(ind)));
+            }
+
+            std::cout << "a" << std::endl;
+
+            std::vector<double> output;
+            for(auto ind : *output_col_indices) {
+                output.emplace_back(std::stod(line.at(ind)));
+            }
+
+            std::cout << "b" << std::endl;
+
+            data_set_contents.push_back(std::make_pair(input, output));
+        }
+        int a = 1;
+
+        return DataSet(&data_set_contents);
+    }
+}
\ No newline at end of file

src/CSVReader/CSVReader.h

@@ -5,4 +5,81 @@
 #ifndef LIB4NEURO_CSVREADER_H
 #define LIB4NEURO_CSVREADER_H
 
+#include <string>
+
+#include "../settings.h"
+#include "../DataSet/DataSet.h"
+
+namespace lib4neuro {
+
+    /**
+     *
+     */
+    class CSVReader {
+    //TODO make more efficient - possibly with external library?
+
+    private:
+
+        /**
+         *
+         */
+        std::string file_path;
+
+        /**
+         *
+         */
+        bool header_included;
+
+        /**
+         *
+         */
+        std::string delimiter;
+
+        /**
+         *
+         */
+        bool ignore_first_line;
+
+        /**
+         *
+         */
+        std::vector<std::vector<std::string>>* data;
+
+    public:
+
+        /**
+         *
+         * @param file_path
+         * @param delimiter
+         * @param ignore_first_line
+         */
+        LIB4NEURO_API CSVReader(std::string file_path, std::string delimiter=",", bool ignore_first_line=false);
+
+        /**
+         *
+         */
+        LIB4NEURO_API void read();
+
+        /**
+         *
+         * @return
+         */
+         LIB4NEURO_API std::vector<std::vector<std::string>>* get_data();
+
+        /**
+         *
+         * @param input_col_indices
+         * @param output_col_indices
+         * @return
+         */
+        LIB4NEURO_API DataSet get_data_set(std::vector<unsigned int>* input_col_indices,
+                std::vector<unsigned int>* output_col_indices);
+
+        /**
+         *
+         */
+        LIB4NEURO_API void print_data();
+    };
+}
+
 #endif //LIB4NEURO_CSVREADER_H