From 75fc1506e59c1eaa52971d20df72c7cbeca5ac82 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Thu, 9 Jun 2022 23:17:53 +0200
Subject: Pass the sanity test

---
 src/defaultIO.zig   | 10 ++++------
 src/field.zig       |  2 +-
 src/interpreter.zig | 36 ++++++++++++++++++++++++++++++++++++
 src/main.zig        | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/pointer.zig     | 14 +++++++++++---
 5 files changed, 101 insertions(+), 10 deletions(-)
 create mode 100644 src/interpreter.zig

diff --git a/src/defaultIO.zig b/src/defaultIO.zig
index b87c2d6..9da4ad2 100644
--- a/src/defaultIO.zig
+++ b/src/defaultIO.zig
@@ -16,15 +16,13 @@ pub fn decimalInput() IOErrors!i64 {
 }
 
 pub fn characterOutput(v: i64) IOErrors!void {
-    // TODO
-    _ = v;
-    return error.NotImplemented;
+    std.debug.print("{c}", .{@intCast(u8, v)});
+    return;
 }
 
 pub fn decimalOutput(v: i64) IOErrors!void {
-    // TODO
-    _ = v;
-    return error.NotImplemented;
+    std.debug.print("{d}", .{v});
+    return;
 }
 
 test "all" {
diff --git a/src/field.zig b/src/field.zig
index c0a0b52..1e9b56f 100644
--- a/src/field.zig
+++ b/src/field.zig
@@ -6,7 +6,7 @@ const Line = struct {
     data: std.ArrayList(i64),
     fn blank(l: *Line, x: i64) void {
         const lx = @intCast(i64, l.len());
-        if (x < l.x or x > l.x + lx) { // outside the field
+        if (x < l.x or x > l.x + lx - 1) { // outside the field
             return;
         } else if (x > l.x and x < l.x + lx - 1) { // just set the value
             l.data.items[@intCast(usize, x - l.x)] = ' ';
diff --git a/src/interpreter.zig b/src/interpreter.zig
new file mode 100644
index 0000000..5702336
--- /dev/null
+++ b/src/interpreter.zig
@@ -0,0 +1,36 @@
+const std = @import("std");
+const field = @import("field.zig");
+const pointer = @import("pointer.zig");
+
+pub const Interpreter = struct {
+    allocator: std.mem.Allocator,
+    field: *field.Field,
+    pointer: *pointer.Pointer,
+
+    pub fn deinit(self: *Interpreter) void {
+        self.allocator.destroy(self);
+    }
+    pub fn init(allocator: std.mem.Allocator, f: *field.Field, p: *pointer.Pointer) !*Interpreter {
+        var i = try allocator.create(Interpreter);
+        errdefer allocator.destroy(i);
+        i.allocator = allocator;
+        i.field = f;
+        i.pointer = p;
+        return i;
+    }
+    pub fn run(self: *Interpreter) !i64 {
+        while (true) {
+            if (try self.pointer.exec()) |ret| {
+                if (ret.code) |code| {
+                    return code;
+                } else {
+                    return 0;
+                }
+            }
+        }
+    }
+};
+
+test "all" {
+    std.testing.refAllDecls(@This());
+}
diff --git a/src/main.zig b/src/main.zig
index 14bada3..7460c60 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const field = @import("field.zig");
+const interpreter = @import("interpreter.zig");
 const pointer = @import("pointer.zig");
 const stackStack = @import("stackStack.zig");
 
@@ -10,3 +11,51 @@ pub fn main() anyerror!void {
 test "all" {
     std.testing.refAllDecls(@This());
 }
+test "minimal" {
+    const minimal = std.io.fixedBufferStream("@").reader();
+    var f = try field.Field.init(std.testing.allocator);
+    defer f.deinit();
+    try f.load(minimal);
+    const argv = [_][]const u8{"minimal"};
+    var p = try pointer.Pointer.init(std.testing.allocator, f, null, argv[0..]);
+    defer p.deinit();
+
+    var i = try interpreter.Interpreter.init(std.testing.allocator, f, p);
+    defer i.deinit();
+
+    var code = try i.run();
+    try std.testing.expectEqual(code, 0);
+}
+test "almost minimal" {
+    const minimal = std.io.fixedBufferStream(" @").reader();
+    var f = try field.Field.init(std.testing.allocator);
+    defer f.deinit();
+    try f.load(minimal);
+    const argv = [_][]const u8{"minimal"};
+    var p = try pointer.Pointer.init(std.testing.allocator, f, null, argv[0..]);
+    defer p.deinit();
+
+    var i = try interpreter.Interpreter.init(std.testing.allocator, f, p);
+    defer i.deinit();
+
+    var code = try i.run();
+    try std.testing.expectEqual(code, 0);
+}
+test "sanity" {
+    var file = try std.fs.cwd().openFile("mycology/sanity.bf", .{});
+    defer file.close();
+
+    var f = try field.Field.init(std.testing.allocator);
+    defer f.deinit();
+    try f.load(file.reader());
+
+    const argv = [_][]const u8{"sanity"};
+    var p = try pointer.Pointer.init(std.testing.allocator, f, null, argv[0..]);
+    defer p.deinit();
+
+    var i = try interpreter.Interpreter.init(std.testing.allocator, f, p);
+    defer i.deinit();
+
+    var code = try i.run();
+    try std.testing.expectEqual(code, 0);
+}
diff --git a/src/pointer.zig b/src/pointer.zig
index dcbca46..485a485 100644
--- a/src/pointer.zig
+++ b/src/pointer.zig
@@ -203,11 +203,19 @@ pub const Pointer = struct {
             'o' => return error.NotImplemented,
             '=' => return error.NotImplemented,
             't' => return error.NotImplemented,
-            else => return error.NotImplemented,
+            else => if (!p.redirect(c)) {
+                if (c >= '0' and c <= '9') {
+                    try p.ss.toss.push(c - '0');
+                } else if (c >= 'a' and c <= 'f') {
+                    try p.ss.toss.push(c - 'a' + 10);
+                } else {
+                    p.reverse();
+                }
+            },
         }
         return null;
     }
-    fn exec(self: *Pointer) !?pointerReturn {
+    pub fn exec(self: *Pointer) !?pointerReturn {
         // Advances to the next instruction of the field and executes it
         // Returns non nil if the pointer terminated, and a return code if
         // the program should terminate completely
@@ -279,7 +287,7 @@ pub const Pointer = struct {
                 p.dy = 0;
             },
             '?' => {
-                const directions = []i8{ 0, -1, 1, 0, 0, 1, -1, 0 };
+                const directions = [_]i8{ 0, -1, 1, 0, 0, 1, -1, 0 };
                 const r = 2 * p.rand.intRangeAtMost(u8, 0, 3);
                 p.dx = directions[r];
                 p.dy = directions[r + 1];
-- 
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