1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
// Take a look at the license at the top of the repository in the LICENSE file.

use std::{fmt, num::NonZeroU32, ptr, sync::Mutex};

use crate::{
    prelude::*, translate::*, utils::is_canonical_pspec_name, Closure, SignalFlags, Type, Value,
};

// rustdoc-stripper-ignore-next
/// Builder for signals.
#[allow(clippy::type_complexity)]
#[must_use = "The builder must be built to be used"]
pub struct SignalBuilder {
    name: String,
    flags: SignalFlags,
    param_types: Vec<SignalType>,
    return_type: SignalType,
    class_handler: Option<
        Box<dyn Fn(&SignalClassHandlerToken, &[Value]) -> Option<Value> + Send + Sync + 'static>,
    >,
    accumulator: Option<
        Box<dyn Fn(&SignalInvocationHint, &mut Value, &Value) -> bool + Send + Sync + 'static>,
    >,
}

// rustdoc-stripper-ignore-next
/// Signal metadata.
pub struct Signal {
    name: String,
    flags: SignalFlags,
    param_types: Vec<SignalType>,
    return_type: SignalType,
    registration: Mutex<SignalRegistration>,
}

// rustdoc-stripper-ignore-next
/// Token passed to signal class handlers.
pub struct SignalClassHandlerToken(
    // rustdoc-stripper-ignore-next
    /// Instance for which the signal is emitted.
    pub(super) *mut gobject_ffi::GTypeInstance,
    // rustdoc-stripper-ignore-next
    /// Return type.
    pub(super) Type,
    // rustdoc-stripper-ignore-next
    /// Arguments value array.
    pub(super) *const Value,
);

impl fmt::Debug for SignalClassHandlerToken {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.debug_struct("SignalClassHandlerToken")
            .field("type", &unsafe {
                crate::Object::from_glib_borrow(self.0 as *mut gobject_ffi::GObject)
            })
            .finish()
    }
}

// rustdoc-stripper-ignore-next
/// Signal invocation hint passed to signal accumulators.
#[repr(transparent)]
pub struct SignalInvocationHint(gobject_ffi::GSignalInvocationHint);

impl SignalInvocationHint {
    #[inline]
    pub fn detail(&self) -> Option<crate::Quark> {
        unsafe { try_from_glib(self.0.detail).ok() }
    }

    #[inline]
    pub fn run_type(&self) -> SignalFlags {
        unsafe { from_glib(self.0.run_type) }
    }
}

impl fmt::Debug for SignalInvocationHint {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.debug_struct("SignalInvocationHint")
            .field("detail", &self.detail())
            .field("run_type", &self.run_type())
            .finish()
    }
}

// rustdoc-stripper-ignore-next
/// In-depth information of a specific signal
pub struct SignalQuery(gobject_ffi::GSignalQuery);

unsafe impl Send for SignalQuery {}
unsafe impl Sync for SignalQuery {}

impl SignalQuery {
    // rustdoc-stripper-ignore-next
    /// The name of the signal.
    #[inline]
    pub fn signal_name<'a>(&self) -> &'a str {
        unsafe {
            let ptr = self.0.signal_name;
            std::ffi::CStr::from_ptr(ptr).to_str().unwrap()
        }
    }

    // rustdoc-stripper-ignore-next
    /// The ID of the signal.
    #[inline]
    pub fn signal_id(&self) -> SignalId {
        unsafe { SignalId::from_glib(self.0.signal_id) }
    }

    // rustdoc-stripper-ignore-next
    /// The instance type this signal can be emitted for.
    #[inline]
    pub fn type_(&self) -> Type {
        unsafe { from_glib(self.0.itype) }
    }

    // rustdoc-stripper-ignore-next
    /// The signal flags.
    #[inline]
    pub fn flags(&self) -> SignalFlags {
        unsafe { from_glib(self.0.signal_flags) }
    }

    // rustdoc-stripper-ignore-next
    /// The return type for the user callback.
    #[inline]
    pub fn return_type(&self) -> SignalType {
        unsafe { from_glib(self.0.return_type) }
    }

    // rustdoc-stripper-ignore-next
    /// The number of parameters the user callback takes.
    #[inline]
    pub fn n_params(&self) -> u32 {
        self.0.n_params
    }

    // rustdoc-stripper-ignore-next
    /// The parameters for the user callback.
    #[inline]
    pub fn param_types(&self) -> &[SignalType] {
        if self.n_params() == 0 {
            return &[];
        }

        unsafe {
            std::slice::from_raw_parts(
                self.0.param_types as *const SignalType,
                self.0.n_params as usize,
            )
        }
    }
}

impl fmt::Debug for SignalQuery {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        f.debug_struct("SignalQuery")
            .field("signal_name", &self.signal_name())
            .field("type", &self.type_())
            .field("flags", &self.flags())
            .field("return_type", &self.return_type())
            .field("param_types", &self.param_types())
            .finish()
    }
}

// rustdoc-stripper-ignore-next
/// Signal ID.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct SignalId(NonZeroU32);

impl SignalId {
    // rustdoc-stripper-ignore-next
    /// Create a new Signal Identifier.
    ///
    /// # Safety
    ///
    /// The caller has to ensure it's a valid signal identifier.
    #[inline]
    pub unsafe fn new(id: NonZeroU32) -> Self {
        Self(id)
    }

    #[doc(alias = "g_signal_parse_name")]
    #[inline]
    pub fn parse_name(
        name: &str,
        type_: Type,
        force_detail: bool,
    ) -> Option<(Self, Option<crate::Quark>)> {
        let mut signal_id = std::mem::MaybeUninit::uninit();
        let mut detail_quark = std::mem::MaybeUninit::uninit();
        unsafe {
            let found: bool = name.run_with_gstr(|name| {
                from_glib(gobject_ffi::g_signal_parse_name(
                    name.as_ptr(),
                    type_.into_glib(),
                    signal_id.as_mut_ptr(),
                    detail_quark.as_mut_ptr(),
                    force_detail.into_glib(),
                ))
            });

            if found {
                Some((
                    from_glib(signal_id.assume_init()),
                    crate::Quark::try_from_glib(detail_quark.assume_init()).ok(),
                ))
            } else {
                None
            }
        }
    }

    // rustdoc-stripper-ignore-next
    /// Find a SignalId by its `name`, and the `type` it connects to.
    #[doc(alias = "g_signal_lookup")]
    #[inline]
    pub fn lookup(name: &str, type_: Type) -> Option<Self> {
        unsafe {
            let signal_id = name.run_with_gstr(|name| {
                gobject_ffi::g_signal_lookup(name.as_ptr(), type_.into_glib())
            });
            if signal_id == 0 {
                None
            } else {
                Some(Self::new(NonZeroU32::new_unchecked(signal_id)))
            }
        }
    }

    // rustdoc-stripper-ignore-next
    /// Queries more in-depth information about the current signal.
    #[doc(alias = "g_signal_query")]
    #[inline]
    pub fn query(&self) -> SignalQuery {
        unsafe {
            let mut query_ptr = std::mem::MaybeUninit::uninit();
            gobject_ffi::g_signal_query(self.into_glib(), query_ptr.as_mut_ptr());
            let query = query_ptr.assume_init();
            debug_assert_ne!(query.signal_id, 0);
            SignalQuery(query)
        }
    }

    // rustdoc-stripper-ignore-next
    /// Find the signal name.
    #[doc(alias = "g_signal_name")]
    #[inline]
    pub fn name<'a>(&self) -> &'a str {
        unsafe {
            let ptr = gobject_ffi::g_signal_name(self.into_glib());
            std::ffi::CStr::from_ptr(ptr).to_str().unwrap()
        }
    }
}

#[doc(hidden)]
impl FromGlib<u32> for SignalId {
    #[inline]
    unsafe fn from_glib(signal_id: u32) -> Self {
        debug_assert_ne!(signal_id, 0);
        Self::new(NonZeroU32::new_unchecked(signal_id))
    }
}

#[doc(hidden)]
impl IntoGlib for SignalId {
    type GlibType = u32;

    #[inline]
    fn into_glib(self) -> u32 {
        self.0.into()
    }
}

#[derive(Copy, Clone, Hash)]
#[repr(transparent)]
pub struct SignalType(ffi::GType);

impl SignalType {
    #[inline]
    pub fn with_static_scope(type_: Type) -> Self {
        Self(type_.into_glib() | gobject_ffi::G_TYPE_FLAG_RESERVED_ID_BIT)
    }

    #[inline]
    pub fn static_scope(&self) -> bool {
        (self.0 & gobject_ffi::G_TYPE_FLAG_RESERVED_ID_BIT) != 0
    }

    #[inline]
    pub fn type_(&self) -> Type {
        (*self).into()
    }
}

impl From<Type> for SignalType {
    #[inline]
    fn from(type_: Type) -> Self {
        Self(type_.into_glib())
    }
}

impl From<SignalType> for Type {
    #[inline]
    fn from(type_: SignalType) -> Self {
        // Remove the extra-bit used for G_SIGNAL_TYPE_STATIC_SCOPE
        let type_ = type_.0 & (!gobject_ffi::G_TYPE_FLAG_RESERVED_ID_BIT);
        unsafe { from_glib(type_) }
    }
}

impl PartialEq<Type> for SignalType {
    #[inline]
    fn eq(&self, other: &Type) -> bool {
        let type_: Type = (*self).into();
        type_.eq(other)
    }
}

impl std::fmt::Debug for SignalType {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        let type_: Type = (*self).into();
        f.debug_struct("SignalType")
            .field("name", &type_.name())
            .field("static_scope", &self.static_scope())
            .finish()
    }
}

#[doc(hidden)]
impl FromGlib<ffi::GType> for SignalType {
    #[inline]
    unsafe fn from_glib(type_: ffi::GType) -> Self {
        Self(type_)
    }
}

#[doc(hidden)]
impl IntoGlib for SignalType {
    type GlibType = ffi::GType;

    #[inline]
    fn into_glib(self) -> ffi::GType {
        self.0
    }
}

#[allow(clippy::type_complexity)]
enum SignalRegistration {
    Unregistered {
        class_handler: Option<
            Box<
                dyn Fn(&SignalClassHandlerToken, &[Value]) -> Option<Value> + Send + Sync + 'static,
            >,
        >,
        accumulator: Option<
            Box<dyn Fn(&SignalInvocationHint, &mut Value, &Value) -> bool + Send + Sync + 'static>,
        >,
    },
    Registered {
        type_: Type,
        signal_id: SignalId,
    },
}

impl SignalBuilder {
    // rustdoc-stripper-ignore-next
    /// The signal's parameters.
    pub fn param_types(
        mut self,
        param_types: impl IntoIterator<Item = impl Into<SignalType>>,
    ) -> Self {
        self.param_types = param_types
            .into_iter()
            .map(|t| t.into())
            .collect::<Vec<_>>();
        self
    }

    // rustdoc-stripper-ignore-next
    /// The signal's returned value type.
    pub fn return_type<T: StaticType>(mut self) -> Self {
        self.return_type = T::static_type().into();
        self
    }

    // rustdoc-stripper-ignore-next
    /// The signal's returned value type.
    pub fn return_type_from(mut self, type_: impl Into<SignalType>) -> Self {
        self.return_type = type_.into();
        self
    }

    // rustdoc-stripper-ignore-next
    /// Run the signal class handler in the first emission stage.
    pub fn run_first(mut self) -> Self {
        self.flags |= SignalFlags::RUN_FIRST;
        self
    }

    // rustdoc-stripper-ignore-next
    /// Run the signal class handler in the third emission stage.
    pub fn run_last(mut self) -> Self {
        self.flags |= SignalFlags::RUN_LAST;
        self
    }

    // rustdoc-stripper-ignore-next
    /// Run the signal class handler in the last emission stage.
    pub fn run_cleanup(mut self) -> Self {
        self.flags |= SignalFlags::RUN_CLEANUP;
        self
    }

    // rustdoc-stripper-ignore-next
    /// Signals being emitted for an object while currently being in emission for this very object
    /// will not be emitted recursively, but instead cause the first emission to be restarted.
    pub fn no_recurse(mut self) -> Self {
        self.flags |= SignalFlags::NO_RECURSE;
        self
    }

    // rustdoc-stripper-ignore-next
    /// This signal supports "::detail" appendices to the signal name upon handler connections and
    /// emissions.
    pub fn detailed(mut self) -> Self {
        self.flags |= SignalFlags::DETAILED;
        self
    }

    // rustdoc-stripper-ignore-next
    /// Action signals are signals that may freely be emitted on alive objects from user code.
    pub fn action(mut self) -> Self {
        self.flags |= SignalFlags::ACTION;
        self
    }

    // rustdoc-stripper-ignore-next
    /// No emissions hooks are supported for this signal.
    pub fn no_hooks(mut self) -> Self {
        self.flags |= SignalFlags::NO_HOOKS;
        self
    }

    // rustdoc-stripper-ignore-next
    /// Varargs signal emission will always collect the arguments, even if there are no signal
    /// handlers connected.
    pub fn must_collect(mut self) -> Self {
        self.flags |= SignalFlags::MUST_COLLECT;
        self
    }

    // rustdoc-stripper-ignore-next
    /// The signal is deprecated and will be removed in a future version.
    pub fn deprecated(mut self) -> Self {
        self.flags |= SignalFlags::DEPRECATED;
        self
    }

    // rustdoc-stripper-ignore-next
    /// Explicitly set all flags.
    ///
    /// This overrides previously set flags on this builder.
    pub fn flags(mut self, flags: SignalFlags) -> Self {
        self.flags = flags;
        self
    }

    // rustdoc-stripper-ignore-next
    /// Class handler for this signal.
    pub fn class_handler<
        F: Fn(&SignalClassHandlerToken, &[Value]) -> Option<Value> + Send + Sync + 'static,
    >(
        mut self,
        func: F,
    ) -> Self {
        self.class_handler = Some(Box::new(func));
        self
    }

    // rustdoc-stripper-ignore-next
    /// Accumulator for the return values of the signal.
    ///
    /// This is called if multiple signal handlers are connected to the signal for accumulating the
    /// return values into a single value.
    pub fn accumulator<
        F: Fn(&SignalInvocationHint, &mut Value, &Value) -> bool + Send + Sync + 'static,
    >(
        mut self,
        func: F,
    ) -> Self {
        self.accumulator = Some(Box::new(func));
        self
    }

    // rustdoc-stripper-ignore-next
    /// Build the signal.
    ///
    /// This does not register the signal yet, which only happens as part of object type
    /// registration.
    #[must_use = "Signal returned from the builder must be used for it to be registered"]
    pub fn build(self) -> Signal {
        let flags = if self.flags
            & (SignalFlags::RUN_FIRST | SignalFlags::RUN_LAST | SignalFlags::RUN_CLEANUP)
            == SignalFlags::empty()
        {
            self.flags | SignalFlags::RUN_LAST
        } else {
            self.flags
        };

        Signal {
            name: self.name,
            flags,
            param_types: self.param_types.to_vec(),
            return_type: self.return_type,
            registration: Mutex::new(SignalRegistration::Unregistered {
                class_handler: self.class_handler,
                accumulator: self.accumulator,
            }),
        }
    }
}

impl Signal {
    // rustdoc-stripper-ignore-next
    /// Create a new builder for a signal.
    pub fn builder(name: &str) -> SignalBuilder {
        assert!(
            is_canonical_pspec_name(name),
            "{name} is not a valid canonical signal name",
        );
        SignalBuilder {
            name: name.to_owned(),
            param_types: Vec::default(),
            return_type: <()>::static_type().into(),
            flags: SignalFlags::empty(),
            class_handler: None,
            accumulator: None,
        }
    }

    // rustdoc-stripper-ignore-next
    /// Name of the signal.
    #[inline]
    pub fn name(&self) -> &str {
        &self.name
    }

    // rustdoc-stripper-ignore-next
    /// Flags of the signal.
    #[inline]
    pub fn flags(&self) -> SignalFlags {
        self.flags
    }

    // rustdoc-stripper-ignore-next
    /// Parameter types of the signal.
    #[inline]
    pub fn param_types(&self) -> &[SignalType] {
        &self.param_types
    }

    // rustdoc-stripper-ignore-next
    /// Return type of the signal.
    #[inline]
    pub fn return_type(&self) -> SignalType {
        self.return_type
    }

    // rustdoc-stripper-ignore-next
    /// Signal ID.
    ///
    /// This will panic if called before the signal was registered.
    #[inline]
    pub fn signal_id(&self) -> SignalId {
        match &*self.registration.lock().unwrap() {
            SignalRegistration::Unregistered { .. } => panic!("Signal not registered yet"),
            SignalRegistration::Registered { signal_id, .. } => *signal_id,
        }
    }

    // rustdoc-stripper-ignore-next
    /// Type this signal was registered for.
    ///
    /// This will panic if called before the signal was registered.
    #[inline]
    pub fn type_(&self) -> Type {
        match &*self.registration.lock().unwrap() {
            SignalRegistration::Unregistered { .. } => panic!("Signal not registered yet"),
            SignalRegistration::Registered { type_, .. } => *type_,
        }
    }

    pub(super) fn register(&self, type_: Type) {
        let mut registration = self.registration.lock().unwrap();

        let (class_handler, accumulator) = match &mut *registration {
            SignalRegistration::Unregistered {
                class_handler,
                accumulator,
            } => (class_handler.take(), accumulator.take()),
            SignalRegistration::Registered { .. } => unreachable!(),
        };

        let return_type = self.return_type;

        let class_handler = class_handler.map(|class_handler| {
            Closure::new(move |values| unsafe {
                let instance = gobject_ffi::g_value_get_object(values[0].to_glib_none().0);
                let res = class_handler(&SignalClassHandlerToken(instance as *mut _, return_type.into(), values.as_ptr()), values);

                if return_type == Type::UNIT {
                    if let Some(ref v) = res {
                        panic!("Signal has no return value but class handler returned a value of type {}", v.type_());
                    }
                } else {
                    match res {
                        None => {
                            panic!("Signal has a return value but class handler returned none");
                        }
                        Some(ref v) => {
                            assert!(v.type_().is_a(return_type.into()), "Signal has a return type of {} but class handler returned {}", Type::from(return_type), v.type_());
                        }
                    }
                }

                res
            })
        });

        unsafe extern "C" fn accumulator_trampoline(
            ihint: *mut gobject_ffi::GSignalInvocationHint,
            return_accu: *mut gobject_ffi::GValue,
            handler_return: *const gobject_ffi::GValue,
            data: ffi::gpointer,
        ) -> ffi::gboolean {
            let accumulator = &*(data as *const (
                SignalType,
                Box<
                    dyn Fn(&SignalInvocationHint, &mut Value, &Value) -> bool
                        + Send
                        + Sync
                        + 'static,
                >,
            ));

            let return_accu = &mut *(return_accu as *mut Value);
            let handler_return = &*(handler_return as *const Value);
            let return_type = accumulator.0;

            assert!(
                handler_return.type_().is_a(return_type.into()),
                "Signal has a return type of {} but handler returned {}",
                Type::from(return_type),
                handler_return.type_()
            );

            let res = (accumulator.1)(&SignalInvocationHint(*ihint), return_accu, handler_return)
                .into_glib();

            assert!(
                return_accu.type_().is_a(return_type.into()),
                "Signal has a return type of {} but accumulator returned {}",
                Type::from(return_type),
                return_accu.type_()
            );

            res
        }

        let (accumulator, accumulator_trampoline) =
            if let (Some(accumulator), true) = (accumulator, return_type != Type::UNIT) {
                (
                    Box::into_raw(Box::new((return_type, accumulator))),
                    Some::<unsafe extern "C" fn(_, _, _, _) -> _>(accumulator_trampoline),
                )
            } else {
                (ptr::null_mut(), None)
            };

        unsafe {
            let signal_id = gobject_ffi::g_signal_newv(
                self.name.to_glib_none().0,
                type_.into_glib(),
                self.flags.into_glib(),
                class_handler.to_glib_none().0,
                accumulator_trampoline,
                accumulator as ffi::gpointer,
                None,
                return_type.into_glib(),
                self.param_types.len() as u32,
                self.param_types.as_ptr() as *mut _,
            );
            *registration = SignalRegistration::Registered {
                type_,
                signal_id: SignalId::from_glib(signal_id),
            };
        }
    }
}