From 804204db7cf1e8a28defd359d17fa72949e13eff Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Mon, 31 Aug 2026 23:05:16 +0200
Subject: Implement with ptrCast to make it more transparent.

---
 src/list.zig | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 src/list.zig

(limited to 'src/list.zig')

diff --git a/src/list.zig b/src/list.zig
new file mode 100644
index 0000000..2d72990
--- /dev/null
+++ b/src/list.zig
@@ -0,0 +1,108 @@
+const std = @import("std");
+const c = @import("c");
+
+const zpy = @import("root.zig");
+
+pub const List = extern struct {
+    const Self = @This();
+
+    data: c.PyObject,
+
+    pub fn new(items: []const *zpy.Object) !*Self {
+        var list: *Self = @ptrCast(c.PyList_New(@intCast(items.len)) orelse return error.Exception);
+        errdefer list.asObject().decref();
+
+        for (items, 0..) |item, index| {
+            list.setUnchecked(index, item);
+        }
+
+        return list;
+    }
+
+    pub fn size(self: *const Self) usize {
+        return @as(usize, c.PyList_Size(@ptrCast(@constCast(self))));
+    }
+
+    pub fn get(self: *const Self, index: usize) !*zpy.Object {
+        return @ptrCast(c.PyList_GetItem(@ptrCast(self), @intCast(index)) orelse return error.Exception);
+    }
+
+    pub fn getUnchecked(self: *const Self, index: usize) !*zpy.Object {
+        return @ptrCast(c.PyList_GET_ITEM(@ptrCast(self), @intCast(index)) orelse return error.Exception);
+    }
+
+    pub fn set(self: *Self, index: usize, value: *zpy.Object) !void {
+        if (c.PyList_SetItem(@ptrCast(self), @intCast(index), @ptrCast(value)) == -1) {
+            return error.Exception;
+        }
+    }
+
+    /// Sets item without any error checking or releasing the resource when replacing.
+    pub fn setUnchecked(self: *Self, index: usize, value: *zpy.Object) void {
+        c.PyList_SET_ITEM(@ptrCast(self), @intCast(index), @ptrCast(value));
+    }
+
+    pub fn insert(self: *Self, index: usize, value: *zpy.Object) !void {
+        if (c.PyList_Insert(@ptrCast(self), @intCast(index), @ptrCast(value)) == -1) {
+            return error.Exception;
+        }
+    }
+
+    pub fn append(self: *Self, value: *zpy.Object) !void {
+        if (c.PyList_Append(@ptrCast(self), @ptrCast(value)) == -1) {
+            return error.Exception;
+        }
+    }
+
+    pub fn getSlice(self: *const Self, from: usize, to: usize) !*Self {
+        return @ptrCast(c.PyList_GetSlice(
+            @ptrCast(@constCast(self)),
+            @intCast(from),
+            @intCast(to),
+        ) orelse return error.Exception);
+    }
+
+    pub fn setSlice(self: *Self, from: usize, to: usize, itemlist: *zpy.Object) !void {
+        if (c.PyList_SetSlice(
+            @ptrCast(self),
+            @intCast(from),
+            @intCast(to),
+            @ptrCast(itemlist),
+        ) == -1) {
+            return error.Exception;
+        }
+    }
+
+    pub fn extend(self: *Self, iterable: *zpy.Object) !void {
+        if (c.PyList_Extend(
+            @ptrCast(self),
+            @ptrCast(iterable),
+        ) == -1) {
+            return error.Exception;
+        }
+    }
+
+    pub fn clear(self: *Self) void {
+        c.PyList_Clear(@ptrCast(self));
+    }
+
+    pub fn sort(self: *Self) !void {
+        if (c.PyList_Sort(@ptrCast(self)) == -1) {
+            return error.Exception;
+        }
+    }
+
+    pub fn reverse(self: *Self) !void {
+        if (c.PyList_Sort(@ptrCast(self)) == -1) {
+            return error.Exception;
+        }
+    }
+
+    pub fn asTuple(self: *Self) *zpy.Tuple {
+        return @ptrCast(c.PyList_AsTuple(@ptrCast(self)));
+    }
+
+    pub fn asObject(self: *Self) *zpy.Object {
+        return @ptrCast(self);
+    }
+};
-- 
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