Add Markov abstract base class

Makefile

@@ -7,7 +7,7 @@ RM = rm -f
 SRCDIR = src
 TMPDIR = build
 TARGET = trumpotron
-FILES = main
+FILES = main Markov
 
 #SOURCES = $(patsubst %,$(SRCDIR)/%.cpp,$(FILES))
 OBJECTS = $(patsubst %,$(TMPDIR)/%.o,$(FILES))

src/Markov.cpp

@@ -0,0 +1,45 @@
+#include "Markov.hpp"
+
+#include <fstream>
+#include <sstream>
+
+
+Markov::~Markov()
+{
+	// does nothing
+}
+
+
+void Markov::eat(std::string filename) // gobble up a file
+{
+	std::ifstream ifs(filename);
+	for (std::string line; std::getline(ifs, line); )
+	{
+		this->swallowLine(line);
+	}
+}
+
+
+void Markov::swallow(std::string& text) // ingest text to later regurgitate
+{
+	std::istringstream iss(text);
+	for (std::string line; std::getline(iss, line); )
+	{
+		this->swallowLine(line);
+	}
+}
+
+
+std::string Markov::regurgitate(int lines, std::string start)
+{
+	// Not sure if it should return or just correct invalid input.
+	// For now, just correct it.
+	if (lines<1) lines = 1;
+	
+	std::string answer = "";
+	for (int i=0; i<lines; ++i) {
+		answer += this->regurgitateLine(start) + "\n";
+	}
+	
+	return answer;
+}

src/Markov.hpp

@@ -0,0 +1,28 @@
+#ifndef MARKOV_HPP
+#define MARKOV_HPP
+
+#include <string>
+
+
+class Markov
+{
+public:
+	virtual ~Markov();
+	
+	// loading and saving of internal state to files
+	virtual void load(std::string filename) =0;
+	virtual void save(std::string filename) =0;
+	
+	void eat(std::string filename); // gobble up a file
+	void swallow(std::string& text); // ingest text to later regurgitate
+	virtual void throwUp() =0; // empty the belly of previous text
+	
+	// generate new text from previously eaten text
+	std::string regurgitate(int lines=1, std::string start="");
+	
+protected:
+	virtual void swallowLine(std::string line) =0;
+	virtual std::string regurgitateLine(std::string start="") =0;
+};
+
+#endif