add pex

1 files changed, 36 insertions, 0 deletions

diff --git a/src/pex/node.zig b/src/pex/node.zig
new file mode 100644
index 0000000..7abb274
--- /dev/null
+++ b/src/pex/node.zig
@@ -0,0 +1,36 @@
+const std = @import("std");
+const Instruction = @import("instruction.zig").Instruction;
+
+const Self = @This();
+
+instruction: Instruction,
+next: ?*Self = null,
+
+pub fn create(instruction: Instruction, node_pool: *std.heap.MemoryPool(Self)) !*Self {
+    const node = try node_pool.create();
+    node.* = .{ .instruction = instruction };
+    return node;
+}
+
+pub fn deinit(self: *Self) void {
+    if (self.next) |next| {
+        next.deinit();
+    }
+    self.* = undefined;
+}
+
+pub fn clone(
+    self: *Self,
+    node_pool: *std.heap.MemoryPool(Self),
+) !*Self {
+    const self_clone = try node_pool.create();
+    self_clone.instruction = self.instruction;
+
+    if (self.next) |next| {
+        self_clone.next = try next.clone(node_pool);
+    } else {
+        self_clone.next = null;
+    }
+
+    return self_clone;
+}