refactor to use a meta test

1 files changed, 82 insertions, 40 deletions

diff --git a/day-2/main.zig b/day-2/main.zig
index 4053caa..f493580 100644
--- a/day-2/main.zig
+++ b/day-2/main.zig
@@ -1,68 +1,110 @@
 const std = @import("std");
 const slurp = @import("util/file.zig").slurp;
 
-var gpa = std.heap.GeneralPurposeAllocator(.{}){};
-const allocator = gpa.allocator();
-
 const Hand = enum(u8) { Rock = 1, Paper = 2, Scissors = 3 };
 const Outcome = enum(u8) { Win = 6, Draw = 3, Lose = 0 };
 
-const KV = struct { @"0": []const u8, @"1": Hand };
+const KV_Hand = struct { @"0": []const u8, @"1": Hand };
+const KV_Outcome = struct { @"0": []const u8, @"1": Outcome };
 
-const Player_A_KV = std.ComptimeStringMap(Hand, [_]KV{
+const Player_A_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
     .{ .@"0" = "A", .@"1" = .Rock },
     .{ .@"0" = "B", .@"1" = .Paper },
     .{ .@"0" = "C", .@"1" = .Scissors },
 });
 
-const Player_B_KV = std.ComptimeStringMap(Hand, [_]KV{
+const Player_B_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
     .{ .@"0" = "X", .@"1" = .Rock },
     .{ .@"0" = "Y", .@"1" = .Paper },
     .{ .@"0" = "Z", .@"1" = .Scissors },
 });
 
-pub fn main() !void {
-    const file_buffer = try slurp(allocator, "./input");
-    defer allocator.free(file_buffer);
+const Outcome_KV = std.ComptimeStringMap(Outcome, [_]KV_Outcome{
+    .{ .@"0" = "X", .@"1" = .Lose },
+    .{ .@"0" = "Y", .@"1" = .Draw },
+    .{ .@"0" = "Z", .@"1" = .Win },
+});
+
+const match_impl = struct {
+    fn puzzle_1(a: Hand, b: Hand) u8 {
+        switch (b) {
+            .Rock => {
+                switch (a) {
+                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Draw),
+                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Lose),
+                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Win),
+                }
+            },
+            .Paper => {
+                switch (a) {
+                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Win),
+                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Draw),
+                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Lose),
+                }
+            },
+            .Scissors => {
+                switch (a) {
+                    .Rock => return @enumToInt(b) + @enumToInt(Outcome.Lose),
+                    .Paper => return @enumToInt(b) + @enumToInt(Outcome.Win),
+                    .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Draw),
+                }
+            },
+        }
+    }
+
+    fn puzzle_2(a: Hand, b: Outcome) u8 {
+        switch (a) {
+            .Rock => {
+                switch (b) {
+                    .Win => return @enumToInt(b) + @enumToInt(Hand.Paper),
+                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Scissors),
+                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Rock),
+                }
+            },
+            .Paper => {
+                switch (b) {
+                    .Win => return @enumToInt(b) + @enumToInt(Hand.Scissors),
+                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Rock),
+                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Paper),
+                }
+            },
+            .Scissors => {
+                switch (b) {
+                    .Win => return @enumToInt(b) + @enumToInt(Hand.Rock),
+                    .Lose => return @enumToInt(b) + @enumToInt(Hand.Paper),
+                    .Draw => return @enumToInt(b) + @enumToInt(Hand.Scissors),
+                }
+            },
+        }
+    }
+};
 
-    var iter = std.mem.split(u8, file_buffer, "\n");
+pub fn puzzle_1(input: []u8) u16 {
+    var iter = std.mem.split(u8, input, "\n");
 
     var score: u16 = 0;
 
     while (iter.next()) |line| {
-        if (line.len > 0) {
-            score += match(
-                Player_A_KV.get(&[_]u8{line[0]}).?,
-                Player_B_KV.get(&[_]u8{line[2]}).?,
-            );
-        }
+        score += match_impl.puzzle_1(
+            Player_A_KV.get(&[_]u8{line[0]}).?,
+            Player_B_KV.get(&[_]u8{line[2]}).?,
+        );
     }
 
-    std.debug.print("{d}\n", .{score});
+    return score;
 }
 
-fn match(a: Hand, b: Hand) u8 {
-    switch (b) {
-        .Rock => {
-            switch (a) {
-                .Rock => return @enumToInt(b) + @enumToInt(Outcome.Draw),
-                .Paper => return @enumToInt(b) + @enumToInt(Outcome.Lose),
-                .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Win),
-            }
-        },
-        .Paper => {
-            switch (a) {
-                .Rock => return @enumToInt(b) + @enumToInt(Outcome.Win),
-                .Paper => return @enumToInt(b) + @enumToInt(Outcome.Draw),
-                .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Lose),
-            }
-        },
-        .Scissors => {
-            switch (a) {
-                .Rock => return @enumToInt(b) + @enumToInt(Outcome.Lose),
-                .Paper => return @enumToInt(b) + @enumToInt(Outcome.Win),
-                .Scissors => return @enumToInt(b) + @enumToInt(Outcome.Draw),
-            }
-        },
+pub fn puzzle_2(input: []u8) u16 {
+    var iter = std.mem.split(u8, input, "\n");
+
+    var score: u16 = 0;
+
+    while (iter.next()) |line| {
+        score += match_impl.puzzle_2(
+            Player_A_KV.get(&[_]u8{line[0]}).?,
+            Outcome_KV.get(&[_]u8{line[2]}).?,
+        );
     }
+
+    return score;
 }