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
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "AsyncRefactoring.h"
using namespace swift;
using namespace swift::refactoring::asyncrefactorings;
CallbackCondition::CallbackCondition(const BinaryExpr *BE,
const FuncDecl *Operator) {
bool FoundNil = false;
BooleanLiteralExpr *FoundBool = nullptr;
bool DidUnwrapOptional = false;
for (auto *Operand : {BE->getLHS(), BE->getRHS()}) {
Operand = Operand->getSemanticsProvidingExpr();
if (auto *IIOE = dyn_cast<InjectIntoOptionalExpr>(Operand)) {
Operand = IIOE->getSubExpr()->getSemanticsProvidingExpr();
DidUnwrapOptional = true;
}
if (isa<NilLiteralExpr>(Operand)) {
FoundNil = true;
} else if (auto *BLE = dyn_cast<BooleanLiteralExpr>(Operand)) {
FoundBool = BLE;
} else if (auto *DRE = dyn_cast<DeclRefExpr>(Operand)) {
Subject = DRE->getDecl();
}
}
if (!Subject)
return;
if (FoundNil) {
if (Operator->getBaseName() == "==") {
Type = ConditionType::NIL;
} else if (Operator->getBaseName() == "!=") {
Type = ConditionType::NOT_NIL;
}
} else if (FoundBool) {
if (Operator->getBaseName() == "==") {
Type = FoundBool->getValue() ? ConditionType::IS_TRUE
: ConditionType::IS_FALSE;
} else if (Operator->getBaseName() == "!=" && !DidUnwrapOptional) {
// Note that we don't consider this case if we unwrapped an optional,
// as e.g optBool != false is a check for true *or* nil.
Type = FoundBool->getValue() ? ConditionType::IS_FALSE
: ConditionType::IS_TRUE;
}
}
}
CallbackCondition::CallbackCondition(const Expr *E) {
// FIXME: Sema should produce ErrorType.
if (!E->getType() || !E->getType()->isBool())
return;
auto CondType = ConditionType::IS_TRUE;
E = E->getSemanticsProvidingExpr();
// If we have a prefix negation operator, this is a check for false.
if (auto *PrefixOp = dyn_cast<PrefixUnaryExpr>(E)) {
auto *Callee = PrefixOp->getCalledValue();
if (Callee && Callee->isOperator() && Callee->getBaseName() == "!") {
CondType = ConditionType::IS_FALSE;
E = PrefixOp->getOperand()->getSemanticsProvidingExpr();
}
}
auto *DRE = dyn_cast<DeclRefExpr>(E);
if (!DRE)
return;
Subject = DRE->getDecl();
Type = CondType;
}
CallbackCondition::CallbackCondition(const Pattern *P, const Expr *Init) {
Init = Init->getSemanticsProvidingExpr();
P = P->getSemanticsProvidingPattern();
if (auto *DRE = dyn_cast<DeclRefExpr>(Init)) {
if (auto *OSP = dyn_cast<OptionalSomePattern>(P)) {
// `let bind = <Subject>`
Type = ConditionType::NOT_NIL;
Subject = DRE->getDecl();
BindPattern = OSP->getSubPattern();
} else if (auto *EEP = dyn_cast<EnumElementPattern>(P)) {
// `case .<func>(let <bind>) = <Subject>`
initFromEnumPattern(DRE->getDecl(), EEP);
}
} else if (auto *OTE = dyn_cast<OptionalTryExpr>(Init)) {
// `let bind = try? <Subject>.get()`
if (auto *OSP = dyn_cast<OptionalSomePattern>(P))
initFromOptionalTry(OSP->getSubPattern(), OTE);
}
}
CallbackCondition::CallbackCondition(const Decl *Subject,
const CaseLabelItem *CaseItem) {
if (auto *EEP = dyn_cast<EnumElementPattern>(
CaseItem->getPattern()->getSemanticsProvidingPattern())) {
// `case .<func>(let <bind>)`
initFromEnumPattern(Subject, EEP);
}
}
void CallbackCondition::initFromEnumPattern(const Decl *D,
const EnumElementPattern *EEP) {
if (auto *EED = EEP->getElementDecl()) {
auto eedTy = EED->getParentEnum()->getDeclaredType();
if (!eedTy || !eedTy->isResult())
return;
if (EED->getNameStr() == StringRef("failure")) {
Type = ConditionType::FAILURE_PATTEN;
} else {
Type = ConditionType::SUCCESS_PATTERN;
}
Subject = D;
BindPattern = EEP->getSubPattern();
}
}
void CallbackCondition::initFromOptionalTry(const class Pattern *P,
const OptionalTryExpr *OTE) {
auto *ICE = dyn_cast<ImplicitConversionExpr>(OTE->getSubExpr());
if (!ICE)
return;
auto *CE = dyn_cast<CallExpr>(ICE->getSyntacticSubExpr());
if (!CE)
return;
auto *DSC = dyn_cast<DotSyntaxCallExpr>(CE->getFn());
if (!DSC)
return;
auto *BaseDRE = dyn_cast<DeclRefExpr>(DSC->getBase());
if (!BaseDRE->getType() || !BaseDRE->getType()->isResult())
return;
auto *FnDRE = dyn_cast<DeclRefExpr>(DSC->getFn());
if (!FnDRE)
return;
auto *FD = dyn_cast<FuncDecl>(FnDRE->getDecl());
if (!FD || FD->getNameStr() != StringRef("get"))
return;
Type = ConditionType::NOT_NIL;
Subject = BaseDRE->getDecl();
BindPattern = P;
}
|
