From 8613a92e2aa75259971a1ee99a52fba3cc9a989d Mon Sep 17 00:00:00 2001
From: Arthur Bols <arthur@bols.dev>
Date: Sun, 18 Dec 2022 17:58:43 +0100
Subject: [PATCH] [Square] Initial implementation

---
 Square.cpp | 85 ++++++++++++++++++++++++++++--------------------------
 Square.hpp | 11 +++----
 2 files changed, 50 insertions(+), 46 deletions(-)

diff --git a/Square.cpp b/Square.cpp
index 729b6e4..687e5b6 100644
--- a/Square.cpp
+++ b/Square.cpp
@@ -1,58 +1,65 @@
 #include "Square.hpp"
 
 #include <ostream>
+#include <iostream>
 
-Square::Square(Index index)
-{
-    (void)index;
+Square::Square(Index index) : mIndex(index) {
 }
 
 Square::Optional Square::fromCoordinates(Coordinate file, Coordinate rank) {
-    (void)file;
-    (void)rank;
-    return std::nullopt;
+    if (file > 7 || rank > 7) {
+        return std::nullopt;
+    }
+
+    return Square(rank * 8 + file);
 }
 
 Square::Optional Square::fromIndex(Index index) {
-    (void)index;
-    return std::nullopt;
+    if (index >= 64)
+        return std::nullopt;
+
+    return Square(index);
 }
 
-Square::Optional Square::fromName(const std::string& name) {
-    (void)name;
-    return std::nullopt;
+Square::Optional Square::fromName(const std::string &name) {
+    if (name.length() != 2)
+        return std::nullopt;
+
+    auto file = static_cast<int>(name[0]) - 'a';
+    auto rank = static_cast<int>(name[1]) - '1';
+
+    return fromCoordinates(file, rank);
 }
 
 Square::Coordinate Square::file() const {
-    return 0;
+    return mIndex % 8;
 }
 
 Square::Coordinate Square::rank() const {
-    return 0;
+    return mIndex / 8;
 }
 
 Square::Index Square::index() const {
-    return 0;
+    return mIndex;
 }
 
+const Square Square::A1 = Square(0 + 0);
+const Square Square::B1 = Square(0 + 1);
+const Square Square::C1 = Square(0 + 2);
+const Square Square::D1 = Square(0 + 3);
+const Square Square::E1 = Square(0 + 4);
+const Square Square::F1 = Square(0 + 5);
+const Square Square::G1 = Square(0 + 6);
+const Square Square::H1 = Square(0 + 7);
 
-const Square Square::A1 = Square( 0 + 0);
-const Square Square::B1 = Square( 0 + 1);
-const Square Square::C1 = Square( 0 + 2);
-const Square Square::D1 = Square( 0 + 3);
-const Square Square::E1 = Square( 0 + 4);
-const Square Square::F1 = Square( 0 + 5);
-const Square Square::G1 = Square( 0 + 6);
-const Square Square::H1 = Square( 0 + 7);
-
-const Square Square::A2 = Square( 8 + 0);
-const Square Square::B2 = Square( 8 + 1);
-const Square Square::C2 = Square( 8 + 2);
-const Square Square::D2 = Square( 8 + 3);
-const Square Square::E2 = Square( 8 + 4);
-const Square Square::F2 = Square( 8 + 5);
-const Square Square::G2 = Square( 8 + 6);
-const Square Square::H2 = Square( 8 + 7);
+const Square Square::A2 = Square(8 + 0);
+const Square Square::B2 = Square(8 + 1);
+const Square Square::C2 = Square(8 + 2);
+const Square Square::D2 = Square(8 + 3);
+const Square Square::E2 = Square(8 + 4);
+const Square Square::F2 = Square(8 + 5);
+const Square Square::G2 = Square(8 + 6);
+const Square Square::H2 = Square(8 + 7);
 
 const Square Square::A3 = Square(16 + 0);
 const Square Square::B3 = Square(16 + 1);
@@ -108,19 +115,15 @@ const Square Square::F8 = Square(56 + 5);
 const Square Square::G8 = Square(56 + 6);
 const Square Square::H8 = Square(56 + 7);
 
-std::ostream& operator<<(std::ostream& os, const Square& square) {
-    (void)square;
+std::ostream &operator<<(std::ostream &os, const Square &square) {
+    os << static_cast<char>(square.file() + 'a') << static_cast<char>(square.rank() + '1');
     return os;
 }
 
-bool operator<(const Square& lhs, const Square& rhs) {
-    (void)lhs;
-    (void)rhs;
-    return false;
+bool operator<(const Square &lhs, const Square &rhs) {
+    return lhs.index() < rhs.index();
 }
 
-bool operator==(const Square& lhs, const Square& rhs) {
-    (void)lhs;
-    (void)rhs;
-    return false;
+bool operator==(const Square &lhs, const Square &rhs) {
+    return lhs.index() == rhs.index();
 }
diff --git a/Square.hpp b/Square.hpp
index c7f1f57..591469a 100644
--- a/Square.hpp
+++ b/Square.hpp
@@ -11,10 +11,9 @@ public:
     using Coordinate = unsigned;
     using Index = unsigned;
     using Optional = std::optional<Square>;
-
     static Optional fromCoordinates(Coordinate file, Coordinate rank);
     static Optional fromIndex(Index index);
-    static Optional fromName(const std::string& name);
+    static Optional fromName(const std::string &name);
 
     Coordinate file() const;
     Coordinate rank() const;
@@ -32,12 +31,14 @@ public:
 private:
 
     Square(Index index);
+
+    Index mIndex;
 };
 
-std::ostream& operator<<(std::ostream& os, const Square& square);
+std::ostream &operator<<(std::ostream &os, const Square &square);
 
 // Necessary to support Square as the key in std::map.
-bool operator<(const Square& lhs, const Square& rhs);
-bool operator==(const Square& lhs, const Square& rhs);
+bool operator<(const Square &lhs, const Square &rhs);
+bool operator==(const Square &lhs, const Square &rhs);
 
 #endif