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const std = @import("std");
const vector = std.meta.Vector(2, i64);
pub const Stack = struct {
allocator: std.mem.Allocator,
data: std.ArrayList(i64),
pub fn clear(self: *Stack) void {
self.data.clearRetainingCapacity();
}
pub fn deinit(self: *Stack) void {
self.data.deinit();
self.allocator.destroy(self);
}
pub fn duplicate(self: *Stack) !void {
if (self.data.items.len > 0) {
try self.push(self.data.items[self.data.items.len - 1]);
}
}
test "duplicate" {
var s = try Stack.init(std.testing.allocator);
defer s.deinit();
try s.duplicate();
try std.testing.expectEqual(s.popVector(), @as(vector, [2]i64{ 0, 0 }));
try s.pushVector([2]i64{ 1, 2 });
try s.duplicate();
try s.duplicate();
try std.testing.expectEqual(s.popVector(), @as(vector, [2]i64{ 2, 2 }));
try std.testing.expectEqual(s.popVector(), @as(vector, [2]i64{ 1, 2 }));
}
pub fn init(allocator: std.mem.Allocator) !*Stack {
var s = try allocator.create(Stack);
s.allocator = allocator;
s.data = std.ArrayList(i64).init(allocator);
return s;
}
pub fn pop(self: *Stack) i64 {
return if (self.data.popOrNull()) |v| v else 0;
}
pub fn popVector(self: *Stack) [2]i64 {
const b = if (self.data.popOrNull()) |v| v else 0;
const a = if (self.data.popOrNull()) |v| v else 0;
return [2]i64{ a, b };
}
pub fn push(self: *Stack, n: i64) !void {
try self.data.append(n);
}
pub fn pushVector(self: *Stack, v: [2]i64) !void {
try self.data.appendSlice(v[0..]);
}
test "pushVector" {
var s = try Stack.init(std.testing.allocator);
defer s.deinit();
try s.pushVector([2]i64{ 1, -1 });
try s.pushVector([2]i64{ 2, -2 });
try std.testing.expectEqual(s.data.items.len, 4);
try std.testing.expectEqual(s.data.items[0], 1);
try std.testing.expectEqual(s.data.items[1], -1);
try std.testing.expectEqual(s.data.items[2], 2);
try std.testing.expectEqual(s.data.items[3], -2);
}
pub fn swap(self: *Stack) !void {
const v = self.popVector();
try self.pushVector([2]i64{ v[1], v[0] });
}
test "swap" {
var s = try Stack.init(std.testing.allocator);
defer s.deinit();
try s.swap();
try std.testing.expectEqual(s.popVector(), @as(vector, [2]i64{ 0, 0 }));
try s.push(1);
try s.swap();
try std.testing.expectEqual(s.popVector(), @as(vector, [2]i64{ 1, 0 }));
try s.push(2);
try s.swap();
try std.testing.expectEqual(s.popVector(), @as(vector, [2]i64{ 2, 0 }));
}
pub fn transfert(toss: *Stack, soss: *Stack, n: u64) !void {
// Implements a value transfert between two stacks, intended for use with the '{'
// (aka begin) and '}' (aka end) stackstack commands
try toss.data.ensureUnusedCapacity(n);
var i: usize = n;
while (i >= std.math.min(soss.data.items.len, n) + 1) : (i -= 1) {
toss.data.appendAssumeCapacity(0);
}
while (i >= 1) : (i -= 1) {
toss.data.appendAssumeCapacity(soss.data.items[soss.data.items.len - i]);
}
if (soss.data.items.len >= n) {
soss.data.items.len -= n;
} else {
soss.data.items.len = 0;
}
}
test "transfert" {
var empty = try Stack.init(std.testing.allocator);
defer empty.deinit();
var empty2 = try Stack.init(std.testing.allocator);
defer empty2.deinit();
try empty.transfert(empty2, 4);
const emptyResult = [_]i64{ 0, 0, 0, 0 };
try std.testing.expectEqualSlices(i64, empty.data.items, emptyResult[0..]);
const empty2Result = [_]i64{};
try std.testing.expectEqualSlices(i64, empty2.data.items, empty2Result[0..]);
try empty.transfert(empty2, 32);
try std.testing.expectEqual(empty.data.items.len, 36);
empty.clear();
var some = try Stack.init(std.testing.allocator);
defer some.deinit();
try some.push(2);
try empty.transfert(some, 3);
const emptyResult2 = [_]i64{ 0, 0, 2 };
try std.testing.expectEqualSlices(i64, empty.data.items, emptyResult2[0..]);
try std.testing.expectEqualSlices(i64, some.data.items, empty2Result[0..]);
empty.clear();
var full = try Stack.init(std.testing.allocator);
defer full.deinit();
try full.push(1);
try full.push(2);
try full.push(3);
try empty.transfert(full, 2);
const emptyResult3 = [_]i64{ 2, 3 };
try std.testing.expectEqualSlices(i64, empty.data.items, emptyResult3[0..]);
const fullResult = [_]i64{1};
try std.testing.expectEqualSlices(i64, full.data.items, fullResult[0..]);
}
pub fn discard(self: *Stack, n: u64) void {
// Implements a discard mechanism intended for use with the '}'(aka end) stackstack command
if (self.data.items.len > n) {
self.data.items.len -= n;
} else {
self.data.items.len = 0;
}
}
test "discard" {
var empty = try Stack.init(std.testing.allocator);
defer empty.deinit();
empty.discard(1);
const emptyResult = [_]i64{};
try std.testing.expectEqualSlices(i64, empty.data.items, emptyResult[0..]);
try empty.push(2);
empty.discard(3);
try std.testing.expectEqualSlices(i64, empty.data.items, emptyResult[0..]);
try empty.push(4);
try empty.push(5);
try empty.push(6);
empty.discard(1);
const emptyResult2 = [_]i64{ 4, 5 };
try std.testing.expectEqualSlices(i64, empty.data.items, emptyResult2[0..]);
}
};
test "all" {
std.testing.refAllDecls(@This());
}
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