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const std = @import("std");
const key = @import("key.zig");
const Config = @import("Config.zig");
const Color = Config.Color;
const Key = key.Key;
const Value = key.Value;
/// Get a value from the config by key into the given pointer. This is
/// specifically for C-compatible APIs. If you're using Zig, just access
/// the configuration directly.
///
/// The return value is false if the given key is not supported by the
/// C API yet. This is a fixable problem so if it is important to support
/// some key, please open an issue.
pub fn get(config: *const Config, k: Key, ptr_raw: *anyopaque) bool {
@setEvalBranchQuota(10_000);
switch (k) {
inline else => |tag| {
const value = fieldByKey(config, tag);
return getValue(ptr_raw, value);
},
}
}
/// Get the value anytype and put it into the pointer. Returns false if
/// the type is not supported by the C API yet or the value is null.
fn getValue(ptr_raw: *anyopaque, value: anytype) bool {
switch (@TypeOf(value)) {
?[:0]const u8 => {
const ptr: *?[*:0]const u8 = @ptrCast(@alignCast(ptr_raw));
ptr.* = if (value) |slice| @ptrCast(slice.ptr) else null;
},
bool => {
const ptr: *bool = @ptrCast(@alignCast(ptr_raw));
ptr.* = value;
},
u8, u32 => {
const ptr: *c_uint = @ptrCast(@alignCast(ptr_raw));
ptr.* = @intCast(value);
},
i16 => {
const ptr: *c_short = @ptrCast(@alignCast(ptr_raw));
ptr.* = @intCast(value);
},
f32, f64 => |Float| {
const ptr: *Float = @ptrCast(@alignCast(ptr_raw));
ptr.* = @floatCast(value);
},
else => |T| switch (@typeInfo(T)) {
.optional => {
// If an optional has no value we return false.
const unwrapped = value orelse return false;
return getValue(ptr_raw, unwrapped);
},
.@"enum" => {
const ptr: *[*:0]const u8 = @ptrCast(@alignCast(ptr_raw));
ptr.* = @tagName(value);
},
.@"struct" => |info| {
// If the struct implements cval then we call then.
if (@hasDecl(T, "cval")) {
const PtrT = @typeInfo(@TypeOf(T.cval)).@"fn".return_type.?;
const ptr: *PtrT = @ptrCast(@alignCast(ptr_raw));
ptr.* = value.cval();
return true;
}
// Packed structs that are less than or equal to the
// size of a C int can be passed directly as their
// bit representation.
if (info.layout != .@"packed") return false;
const Backing = info.backing_integer orelse return false;
if (@bitSizeOf(Backing) > @bitSizeOf(c_uint)) return false;
const ptr: *c_uint = @ptrCast(@alignCast(ptr_raw));
ptr.* = @intCast(@as(Backing, @bitCast(value)));
},
.@"union" => |_| {
if (@hasDecl(T, "cval")) {
const PtrT = @typeInfo(@TypeOf(T.cval)).@"fn".return_type.?;
const ptr: *PtrT = @ptrCast(@alignCast(ptr_raw));
ptr.* = value.cval();
return true;
}
return false;
},
else => return false,
},
}
return true;
}
/// Get a value from the config by key.
fn fieldByKey(self: *const Config, comptime k: Key) Value(k) {
const field = comptime field: {
const fields = std.meta.fields(Config);
for (fields) |field| {
if (@field(Key, field.name) == k) {
break :field field;
}
}
unreachable;
};
return @field(self, field.name);
}
test "c_get: u8" {
const testing = std.testing;
const alloc = testing.allocator;
var c = try Config.default(alloc);
defer c.deinit();
c.@"font-size" = 24;
var cval: f32 = undefined;
try testing.expect(get(&c, .@"font-size", &cval));
try testing.expectEqual(@as(f32, 24), cval);
}
test "c_get: enum" {
const testing = std.testing;
const alloc = testing.allocator;
var c = try Config.default(alloc);
defer c.deinit();
c.@"window-theme" = .dark;
var cval: [*:0]u8 = undefined;
try testing.expect(get(&c, .@"window-theme", @ptrCast(&cval)));
const str = std.mem.sliceTo(cval, 0);
try testing.expectEqualStrings("dark", str);
}
test "c_get: color" {
const testing = std.testing;
const alloc = testing.allocator;
var c = try Config.default(alloc);
defer c.deinit();
c.background = .{ .r = 255, .g = 0, .b = 0 };
var cval: Color.C = undefined;
try testing.expect(get(&c, .background, @ptrCast(&cval)));
try testing.expectEqual(255, cval.r);
try testing.expectEqual(0, cval.g);
try testing.expectEqual(0, cval.b);
}
test "c_get: optional" {
const testing = std.testing;
const alloc = testing.allocator;
var c = try Config.default(alloc);
defer c.deinit();
{
c.@"unfocused-split-fill" = null;
var cval: Color.C = undefined;
try testing.expect(!get(&c, .@"unfocused-split-fill", @ptrCast(&cval)));
}
{
c.@"unfocused-split-fill" = .{ .r = 255, .g = 0, .b = 0 };
var cval: Color.C = undefined;
try testing.expect(get(&c, .@"unfocused-split-fill", @ptrCast(&cval)));
try testing.expectEqual(255, cval.r);
try testing.expectEqual(0, cval.g);
try testing.expectEqual(0, cval.b);
}
}
test "c_get: background-blur" {
const testing = std.testing;
const alloc = testing.allocator;
var c = try Config.default(alloc);
defer c.deinit();
{
c.@"background-blur" = .false;
var cval: u8 = undefined;
try testing.expect(get(&c, .@"background-blur", @ptrCast(&cval)));
try testing.expectEqual(0, cval);
}
{
c.@"background-blur" = .true;
var cval: u8 = undefined;
try testing.expect(get(&c, .@"background-blur", @ptrCast(&cval)));
try testing.expectEqual(20, cval);
}
{
c.@"background-blur" = .{ .radius = 42 };
var cval: u8 = undefined;
try testing.expect(get(&c, .@"background-blur", @ptrCast(&cval)));
try testing.expectEqual(42, cval);
}
}
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