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const std = @import("std");
const stack = @import("stack.zig");
pub const StackStack = struct {
allocator: std.mem.Allocator,
data: std.ArrayList(*stack.Stack),
toss: *stack.Stack,
pub fn deinit(self: *StackStack) void {
self.toss.deinit();
for (self.data.items) |s| {
s.deinit();
}
self.data.deinit();
self.allocator.destroy(self);
}
pub fn init(allocator: std.mem.Allocator) !*StackStack {
var ss = try allocator.create(StackStack);
errdefer allocator.destroy(ss);
ss.allocator = allocator;
ss.data = std.ArrayList(*stack.Stack).init(allocator);
errdefer ss.data.deinit();
ss.toss = try stack.Stack.init(allocator);
return ss;
}
pub fn begin(self: *StackStack, v: [2]i64) !void {
var soss = self.toss;
try self.data.append(soss);
const n = soss.pop();
self.toss = try stack.Stack.init(self.allocator);
if (n > 0) {
try self.toss.transfert(soss, @intCast(u64, n));
} else if (n < 0) {
var i: usize = 0;
while (i < -n) : (i += 1) {
try soss.push(0);
}
}
try soss.pushVector(v);
}
test "begin" {
var empty = try StackStack.init(std.testing.allocator);
defer empty.deinit();
try empty.begin([2]i64{ 1, 2 });
const tossResult = [_]i64{};
const sossResult = [_]i64{ 1, 2 };
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[0].data.items, sossResult[0..]);
try empty.toss.push(5);
try empty.toss.push(6);
try empty.toss.push(4);
try empty.begin([2]i64{ 7, 8 });
const tossResult2 = [_]i64{ 0, 0, 5, 6 };
const sossResult2 = [_]i64{ 7, 8 };
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult2[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[0].data.items, sossResult[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[1].data.items, sossResult2[0..]);
try empty.toss.push(9);
try empty.toss.push(10);
try empty.toss.push(11);
try empty.toss.push(12);
try empty.toss.push(2);
try empty.begin([2]i64{ 13, 14 });
const tossResult3 = [_]i64{ 11, 12 };
const sossResult3 = [_]i64{ 0, 0, 5, 6, 9, 10, 13, 14 };
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult3[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[0].data.items, sossResult[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[1].data.items, sossResult2[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[2].data.items, sossResult3[0..]);
try empty.toss.push(15);
try empty.toss.push(16);
try empty.toss.push(-2);
try empty.begin([2]i64{ 17, 18 });
const tossResult4 = [_]i64{};
const sossResult4 = [_]i64{ 11, 12, 15, 16, 0, 0, 17, 18 };
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult4[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[0].data.items, sossResult[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[1].data.items, sossResult2[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[2].data.items, sossResult3[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[3].data.items, sossResult4[0..]);
}
pub fn end(self: *StackStack) !?[2]i64 {
// Implements the '}' command behaviour which pops a stack from the stack stack
// returns null if a reflect should happen, a storage offset vector otherwise
if (self.data.popOrNull()) |soss| {
const n = self.toss.pop();
const v = soss.popVector();
if (n > 0) {
try soss.transfert(self.toss, @intCast(u64, n));
} else {
soss.discard(@intCast(u64, -n));
}
self.toss.deinit();
self.toss = soss;
return v;
} else {
return null;
}
}
test "end" {
var empty = try StackStack.init(std.testing.allocator);
defer empty.deinit();
try empty.toss.push(1);
try std.testing.expectEqual(empty.end(), null);
const tossResult = [_]i64{1};
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult[0..]);
try empty.toss.push(2);
try empty.toss.push(3);
try empty.toss.push(4);
try empty.toss.push(2);
try empty.begin([2]i64{ 5, 6 });
try empty.toss.push(7);
try empty.toss.push(2);
try std.testing.expectEqual(empty.end(), [2]i64{ 5, 6 });
const tossResult2 = [_]i64{ 1, 2, 4, 7 };
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult2[0..]);
try empty.toss.push(1);
try empty.begin([2]i64{ 8, 9 });
try empty.toss.push(-2);
try std.testing.expectEqual(empty.end(), [2]i64{ 8, 9 });
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult[0..]);
}
pub fn under(self: *StackStack) !bool {
if (self.data.items.len == 0) {
return true;
}
const n = self.toss.pop();
var soss = self.data.items[self.data.items.len - 1];
if (n > 0) {
var i: usize = 0;
while (i < n) : (i += 1) {
try self.toss.push(soss.pop());
}
} else {
var i: usize = 0;
while (i < -n) : (i += 1) {
try soss.push(self.toss.pop());
}
}
return false;
}
test "under" {
var empty = try StackStack.init(std.testing.allocator);
defer empty.deinit();
try empty.toss.push(1);
try std.testing.expectEqual(empty.under(), true);
const tossResult = [_]i64{1};
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult[0..]);
try empty.toss.push(2);
try empty.toss.push(3);
try empty.toss.push(4);
try empty.toss.push(5);
try empty.toss.push(6);
try empty.toss.push(0);
try empty.begin([2]i64{ 7, 8 });
try empty.toss.push(9);
try empty.toss.push(0);
try std.testing.expectEqual(empty.under(), false);
const tossResult2 = [_]i64{9};
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult2[0..]);
try empty.toss.push(2);
try std.testing.expectEqual(empty.under(), false);
const tossResult3 = [_]i64{ 9, 8, 7 };
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult3[0..]);
try empty.toss.push(-1);
try std.testing.expectEqual(empty.under(), false);
const tossResult4 = [_]i64{ 9, 8 };
const sossResult = [_]i64{ 1, 2, 3, 4, 5, 6, 7 };
try std.testing.expectEqualSlices(i64, empty.toss.data.items, tossResult4[0..]);
try std.testing.expectEqualSlices(i64, empty.data.items[0].data.items, sossResult[0..]);
}
pub inline fn toss(self: *StackStack) *stack.Stack {
return self.toss;
}
};
test "all" {
std.testing.refAllDecls(@This());
}
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