Add parser for obj mesh format

Makefile

@@ -7,7 +7,8 @@ CXXLIBS=
 TARGETS=
 
 OBJS=Implicit.o \
-	 Mesh.o
+	 Mesh.o \
+	 util/ObjParser.o
 
 all: $(TARGETS:=.bin)
 

util/ObjParser.cpp

@@ -0,0 +1,32 @@
+#include "ObjParser.hpp"
+
+ObjParser::ObjParser(const std::string& path)
+    : path(path)
+{}
+
+Mesh ObjParser::parse() {
+    std::ifstream handle(path);
+    Mesh output;
+
+    if(!handle.is_open())
+       throw std::runtime_error(std::string("Cannot open the file ") + path);
+
+    while(!handle.eof()) {
+        char type;
+        handle >> type;
+        if(type == 'v') { // vertice
+            double x, y, z;
+            handle >> x >> y >> z;
+            output.add_vertice(Point(x, y, z));
+        }
+        else {
+            int v1, v2, v3;
+            handle >> v1 >> v2 >> v3;
+            output.add_face(Face(v1, v2, v3));
+        }
+
+        handle.ignore('\n');
+    }
+
+    return output;
+}

util/ObjParser.hpp

@@ -0,0 +1,16 @@
+/** Parses .obj mesh files, outputting a `Mesh` */
+
+#include <fstream>
+#include <string>
+#include <stdexcept>
+
+#include "../Mesh.hpp"
+
+class ObjParser {
+    public:
+        ObjParser(const std::string& path);
+        Mesh parse();
+
+    private:
+        std::string path;
+};