src/filter.cpp

@@ -1,7 +1,82 @@
 #include "filter.hpp"
+#include <cstdlib>
+#include <fstream>
+#include <iostream>
 
-Filter::Filter(void) {
+SMSMessage::SMSMessage(MessageType given_type, std::string given_message) {
+    this->actual_type = given_type;
+    this->message = given_message;
 }
 
-Filter::~Filter(void) {
+// Takes in a file name from which it will generate a probability filter
+void SMSMessageFilter::GenerateProbability(std::string file_name) {
+    // Open file
+    std::ifstream input_messages(file_name);
+    if (!input_messages.is_open()) {
+        std::cerr << "Error opening '" << file_name << "'" << std::endl;
+        std::exit(EXIT_FAILURE);
+    }
+
+    // Read in messages
+    MessageType temp_type;
+    std::string temp_message;
+    while (!input_messages.eof()) {
+        input_messages.get(&temp_message[0], 10, '\t');
+        if (temp_message == "spam") { temp_type = kSpam; }
+        else if (temp_message == "ham") { temp_type = kHam; }
+        else { 
+            std::cerr << "[SMSMessageFilter - Warning]" << 
+                         " Could not determine message type" << std::endl;
+            std::cerr << "\t Contains: <" << temp_message << ">" << std::endl;
+        }
+        input_messages >> temp_message;
+    }
+}
+
+void SMSMessageFilter::Filter(std::string file_name) {
+    // Open file
+    std::ifstream input_messages(file_name);
+    if (!input_messages.is_open()) {
+        std::cerr << "Error opening '" << file_name << "'" << std::endl;
+        std::exit(EXIT_FAILURE);
+    }
+
+    // Read in messages
+    MessageType temp_type;
+    std::string temp_message;
+    while (!input_messages.eof()) {
+        input_messages.get(&temp_message[0], 10, '\t');
+        if (temp_message == "spam") { temp_type = kSpam; }
+        else if (temp_message == "ham") { temp_type = kHam; }
+        else { 
+            std::cerr << "[SMSMessageFilter - Warning]" << 
+                         " Could not determine message type" << std::endl;
+            std::cerr << "\t Contains: <" << temp_message << ">" << std::endl;
+        }
+        input_messages >> temp_message;
+        filtered_messages.emplace_back(temp_type, temp_message);
+    }
+}
+
+void SMSMessageFilter::PrintReport(void) {
+    // Spam precision: (true positives) / (true positives + false positives)
+    std::cout << "[SMSMessageFilter - Report] Spam precision:   ";
+
+    // Spam recall: (true positives) / (true positives + false negatives)
+    std::cout << "[SMSMessageFilter - Report] Spam recall:      ";
+
+    // Ham precision: (true negatives) / (true negatives + false negatives)
+    std::cout << "[SMSMessageFilter - Report] Ham precision:    ";
+
+    // Ham recall: (true negatives) / (true negatives + false positives)
+    std::cout << "[SMSMessageFilter - Report] Ham recall:       ";
+
+    // Spam F-Score: 2* (spam precision * spam recall) / (spam precision + spam recall)
+    std::cout << "[SMSMessageFilter - Report] Spam F-Score:     ";
+    
+    // Ham F-Score: 2* (ham precision * ham recall) / (ham precision + ham recall)
+    std::cout << "[SMSMessageFilter - Report] Ham F-Score:      ";
+
+    // Accuracy: (spam recall + ham recall) / 2
+    std::cout << "[SMSMessageFilter - Report] Accuracy:         ";
 }

src/filter.hpp

@@ -1,17 +1,35 @@
 #ifndef FILTER_HPP
 #define FILTER_HPP
 
-class Filter {
+#include <map>
+#include <string>
+#include <vector>
+
+enum MessageType {
+    kSpam = 0,
+    kHam = 1,
+    kUnknown = 2,
+};
+
+struct SMSMessage {
+    SMSMessage(MessageType given_type, std::string given_message);
+    MessageType actual_type;
+    std::string message;
+    MessageType filter_type;
+};
+
+class SMSMessageFilter {
 public:
-    Filter(void);
-    Filter(Filter &&) = default;
-    Filter(const Filter &) = default;
-    Filter &operator=(Filter &&) = default;
-    Filter &operator=(const Filter &) = default;
-    ~Filter(void);
+    SMSMessageFilter(void) = default;
+    ~SMSMessageFilter(void) = default;
+    void GenerateProbability(std::string file_name);
+    void Filter(std::string file_name);
+    void PrintReport(void);
 
 private:
-
+    double sentence_probability_ham = 0.5; // Spam is 1 - sentence_probability_ham 
+    std::map<std::string, double> probability_dictionary;
+    std::vector<SMSMessage> filtered_messages;
     
 };