• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.databinding.tool.expr
18 
19 import android.databinding.tool.reflection.Callable
20 import android.databinding.tool.solver.ExecutionPath
21 import android.databinding.tool.writer.KCode
22 import android.databinding.tool.writer.fieldName
23 import android.databinding.tool.writer.isForcedToLocalize
24 import android.databinding.tool.writer.isVariable
25 import android.databinding.tool.writer.kcode
26 import android.databinding.tool.writer.scopedName
27 
shouldLocalizeInCallbacksnull28 fun Expr.shouldLocalizeInCallbacks() = canBeEvaluatedToAVariable() && !resolvedType.isVoid && (isDynamic || isForcedToLocalize())
29 
30 fun CallbackExprModel.localizeGlobalVariables(vararg ignore: Expr): KCode = kcode("// localize variables for thread safety") {
31     // puts all variables in this model to local values.
32     mExprMap.values.filter { it.shouldLocalizeInCallbacks() && !ignore.contains(it) }.forEach {
33         nl("// ${it.toString()}")
34         nl("${it.resolvedType.toJavaCode()} ${it.scopedName()} = ${if (it.isVariable()) it.fieldName else it.defaultValue};")
35     }
36 }
37 
<lambda>null38 fun ExecutionPath.toCode(): KCode = kcode("") {
39     val myExpr = expr
40     if (myExpr != null && !isAlreadyEvaluated) {
41         // variables are read up top
42         val localize = myExpr.shouldLocalizeInCallbacks() && !myExpr.isVariable()
43         // if this is not a method call (or method call via field access, don't do anything
44         val eligible = localize || (myExpr is MethodCallExpr || (myExpr is FieldAccessExpr && myExpr.getter.type == Callable.Type.METHOD))
45         if (eligible) {
46             val assign = if (localize) {
47                 "${myExpr.scopedName()} = "
48             } else {
49                 ""
50             }
51             if (myExpr is TernaryExpr) {
52                 // if i know the value, short circuit it
53                 if (knownValues.containsKey(myExpr.pred)) {
54                     val chosen = if (knownValues[myExpr.pred]!!) myExpr.ifTrue else myExpr.ifFalse
55                     // fast read me
56                     nl("$assign${chosen.toCode().generate()};")
57                 } else {
58                     // read me
59                     nl("$assign${myExpr.toFullCode().generate()};")
60                 }
61             } else {
62                 // read me
63                 nl("$assign${myExpr.toFullCode().generate()};")
64             }
65         }
66     }
67     children.forEach {
68         nl(it.toCode())
69     }
70     // if i have branches, execute them
71     val myTrue = trueBranch
72     val myFalse = falseBranch
73     if (myTrue != null) {
74         val condition = with(myTrue.conditional) {
75             if (shouldLocalizeInCallbacks()) {
76                 scopedName()
77             } else {
78                 toFullCode().generate()
79             }
80         }
81         block("if ($condition)") {
82             nl(myTrue.path.toCode())
83         }
84         if (myFalse != null) {
85             block("else") {
86                 nl(myFalse.path.toCode())
87             }
88         }
89     }
90 }