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const std = @import("std");
const List = std.ArrayList;
fn Args(comptime T: type, params: []const std.builtin.Type.Fn.Param) type {
const method = params.len > 0 and switch (@typeInfo(params[0].type.?)) {
.pointer => |p| p.child == T,
else => params[0].type == T,
};
const argCount = if (method) params.len - 1 else params.len;
var argTypes: [argCount]type = undefined;
for (0..argCount) |i| {
const p = if (method) params[i + 1] else params[i];
argTypes[i] = p.type.?;
}
return @Tuple(&argTypes);
}
fn Val(comptime T: type) type {
const ti: std.builtin.Type.Struct = switch (@typeInfo(T)) {
.@"struct" => |s| s,
.pointer => |p| @typeInfo(p.child).@"struct",
else => @compileError("only struct types allowed"),
};
const fieldCount = ti.fields.len + ti.decls.len + 1; // + 1 for value
var names: [fieldCount][]const u8 = undefined;
var types: [fieldCount]type = undefined;
var attrs: [fieldCount]std.builtin.Type.StructField.Attributes = undefined;
// value
{
names[fieldCount - 1] = "value";
const NT = struct {
value: T = undefined,
pub fn init(self: *@This(), t: T) void {
self.value = t;
inline for (ti.fields) |field| {
const parent: *Val(T) = @alignCast(@fieldParentPtr("value", self));
@field(parent, field.name).value.init(&@field(self.value, field.name));
}
inline for (ti.decls) |decl| {
const parent: *Val(T) = @alignCast(@fieldParentPtr("value", self));
@field(parent, decl.name).init();
}
}
pub fn deinit(self: *@This(), alloc: std.mem.Allocator) void {
inline for (ti.fields) |field| {
const parent: *Val(T) = @alignCast(@fieldParentPtr("value", self));
@field(parent, field.name).value.deinit(alloc);
}
inline for (ti.decls) |decl| {
const parent: *Val(T) = @alignCast(@fieldParentPtr("value", self));
@field(parent, decl.name).deinit(alloc);
}
}
pub fn get(self: *@This()) if (@typeInfo(T) == .pointer) T else *T {
if (@typeInfo(T) == .pointer) {
return self.value;
} else {
return &self.value;
}
}
};
types[fieldCount - 1] = NT;
attrs[fieldCount - 1] = .{
.@"comptime" = false,
.@"align" = @alignOf(NT),
.default_value_ptr = &NT{},
};
}
// fields
inline for (ti.fields, 0..) |field, idx| {
if (field.is_comptime)
@compileError("implement skipping comptime fields");
const fi = @typeInfo(field.type);
switch (fi) {
.@"struct" => {
names[idx] = field.name;
const NT = Val(*field.type);
types[idx] = NT;
attrs[idx] = .{};
},
else => {
names[idx] = field.name;
const NT = struct {
const _NT = @This();
value: struct {
value: *field.type = undefined,
pub fn init(self: *@This(), value: *field.type) void {
self.value = value;
var parent: *_NT = @fieldParentPtr("value", self);
parent.on_get = .empty;
parent.on_set = .empty;
}
pub fn deinit(self: *@This(), alloc: std.mem.Allocator) void {
var parent: *_NT = @fieldParentPtr("value", self);
parent.on_get.clearAndFree(alloc);
parent.on_set.clearAndFree(alloc);
}
},
on_get: List(*const fn (field.type) void) = .empty,
on_set: List(*const fn (field.type) void) = .empty,
pub fn get(self: *@This()) field.type {
for (self.on_get.items) |cb| cb(self.value.value.*);
return self.value.value.*;
}
pub fn set(self: *@This(), value: field.type) void {
for (self.on_set.items) |cb| cb(self.value.value.*);
self.value.value.* = value;
}
};
types[idx] = NT;
attrs[idx] = .{};
},
}
}
// decls
inline for (ti.decls, ti.fields.len..) |decl, idx| {
names[idx] = decl.name;
const T2 = if (@typeInfo(T) == .pointer) @typeInfo(T).pointer.child else T;
const F = @TypeOf(@field(T2, decl.name));
const fi = @typeInfo(F).@"fn";
const method = fi.params.len > 0 and switch (@typeInfo(fi.params[0].type.?)) {
.pointer => |p| p.child == T,
else => fi.params[0].type == T,
};
const modifying = method and switch (@typeInfo(fi.params[0].type.?)) {
.pointer => |p| !p.is_const,
else => false,
};
const NT = struct {
on_call: List(*const F) = .empty,
on_modify: List(*const F) = .empty,
pub fn init(self: *@This()) void {
self.on_call = .empty;
self.on_modify = .empty;
}
pub fn deinit(self: *@This(), alloc: std.mem.Allocator) void {
self.on_call.clearAndFree(alloc);
self.on_modify.clearAndFree(alloc);
}
pub fn call(self: *@This(), args: Args(T, fi.params)) (fi.return_type orelse void) {
const allArgs = blk: {
if (method) {
const parent: *Val(T) = @alignCast(@fieldParentPtr(decl.name, self));
const tiv = @typeInfo(@TypeOf(parent.value.value));
const tip = @typeInfo(fi.params[0].type.?);
const arg0 =
if (tiv == .pointer and tip != .pointer) parent.value.value.* else if (tiv != .pointer and tip == .pointer) &parent.value.value else parent.value.value;
break :blk .{arg0} ++ args;
} else {
break :blk args;
}
};
@call(.auto, @field(T2, decl.name), allArgs);
for (self.on_call.items) |cb| @call(.auto, cb, allArgs);
if (modifying)
for (self.on_modify.items) |cb| @call(.auto, cb, allArgs);
}
};
types[idx] = NT;
attrs[idx] = .{ .default_value_ptr = &NT{} };
}
return @Struct(.auto, null, &names, &types, &attrs);
}
pub fn main(init: std.process.Init) !void {
const A = struct {
i: i32 = 123,
j: i32 = 456,
s: struct {
i: i32 = 789,
t: struct {
j: i32 = 341,
pub fn yo() void {
std.debug.print("t.yo!\n", .{});
}
} = .{},
pub fn jo() void {
std.debug.print("s.jo!\n", .{});
}
} = .{},
pub fn b() void {
std.debug.print("B!\n", .{});
}
pub fn c(self: @This()) void {
std.debug.print("C! ({})\n", .{self});
}
pub fn d(self: *@This(), i: i32) void {
self.i += i;
std.debug.print("D! ({})\n", .{self});
}
};
var a: Val(A) = undefined;
a.value.init(.{});
defer a.value.deinit(init.gpa);
const callbacks = struct {
fn set1(i: i32) void {
std.debug.print("{} was set\n", .{i});
}
fn get1(i: i32) void {
std.debug.print("{} was get\n", .{i});
}
fn f0() void {
std.debug.print("called!\n", .{});
}
fn f1(self: A) void {
std.debug.print("called ({})!\n", .{self});
}
fn f2(self: *A, i: i32) void {
std.debug.print("called ({}, {})!\n", .{ self, i });
}
};
try a.j.on_get.append(init.gpa, callbacks.get1);
try a.j.on_set.append(init.gpa, callbacks.set1);
try a.b.on_call.append(init.gpa, callbacks.f0);
try a.c.on_call.append(init.gpa, callbacks.f1);
try a.d.on_call.append(init.gpa, callbacks.f2);
try a.s.jo.on_call.append(init.gpa, callbacks.f0);
try a.s.t.yo.on_call.append(init.gpa, callbacks.f0);
std.debug.print("{}\n{}\n", .{ a, a.value });
a.b.call(.{});
std.debug.print("{}\n", .{a.value.get()});
std.debug.print("{}\n", .{a.s.value.get()});
a.c.call(.{});
a.d.call(.{5});
a.s.jo.call(.{});
a.s.t.yo.call(.{});
std.debug.print("{}\n", .{a.i.get()});
std.debug.print("{}\n", .{a.j.get()});
a.j.set(9);
std.debug.print("{}\n", .{a.j.get()});
std.debug.print("{}\n", .{a.j.get()});
std.debug.print("{}\n", .{a.j.get()});
std.debug.print("{}\n", .{a.s.i.get()});
}
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