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ClosureReverseAbstractInterpreter.java
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ClosureReverseAbstractInterpreter.java
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/*
* Copyright 2007 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp.type;
import static com.google.javascript.rhino.jstype.JSTypeNative.ARRAY_TYPE;
import static com.google.javascript.rhino.jstype.JSTypeNative.NO_OBJECT_TYPE;
import static com.google.javascript.rhino.jstype.JSTypeNative.NULL_TYPE;
import static com.google.javascript.rhino.jstype.JSTypeNative.NULL_VOID;
import static com.google.javascript.rhino.jstype.JSTypeNative.NUMBER_STRING_BOOLEAN_SYMBOL;
import static com.google.javascript.rhino.jstype.JSTypeNative.OBJECT_TYPE;
import static com.google.javascript.rhino.jstype.JSTypeNative.VOID_TYPE;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.jstype.FunctionType;
import com.google.javascript.rhino.jstype.JSType;
import com.google.javascript.rhino.jstype.JSTypeRegistry;
import com.google.javascript.rhino.jstype.ObjectType;
import com.google.javascript.rhino.jstype.Visitor;
import java.util.Map;
import javax.annotation.CheckReturnValue;
/**
* A reverse abstract interpreter (RAI) for specific closure patterns such as
* {@code goog.isDef}.
*
*/
public final class ClosureReverseAbstractInterpreter
extends ChainableReverseAbstractInterpreter {
/**
* For when {@code goog.isObject} returns true. This includes functions, but
* not {@code null}.
*/
private final Visitor<JSType> restrictToObjectVisitor =
new RestrictByTrueTypeOfResultVisitor() {
@Override
protected JSType caseTopType(JSType topType) {
return getNativeType(NO_OBJECT_TYPE);
}
@Override
public JSType caseObjectType(ObjectType type) {
return type;
}
@Override
public JSType caseFunctionType(FunctionType type) {
return type;
}
};
/**
* For when {@code goog.isObject} returns false.
*/
private final Visitor<JSType> restrictToNotObjectVisitor =
new RestrictByFalseTypeOfResultVisitor() {
@Override
public JSType caseAllType() {
return typeRegistry.createUnionType(
getNativeType(NUMBER_STRING_BOOLEAN_SYMBOL), getNativeType(NULL_VOID));
}
@Override
public JSType caseObjectType(ObjectType type) {
return null;
}
@Override
public JSType caseFunctionType(FunctionType type) {
return null;
}
};
/** Functions used to restrict types. */
private final Map<String, Function<TypeRestriction, JSType>> restricters;
public ClosureReverseAbstractInterpreter(final JSTypeRegistry typeRegistry) {
super(typeRegistry);
this.restricters =
new ImmutableMap.Builder<String, Function<TypeRestriction, JSType>>()
.put(
"isDef",
p -> {
if (p.outcome) {
return getRestrictedWithoutUndefined(p.type);
} else {
return p.type != null
? getNativeType(VOID_TYPE).getGreatestSubtype(p.type)
: null;
}
})
.put(
"isNull",
p -> {
if (p.outcome) {
return p.type != null
? getNativeType(NULL_TYPE).getGreatestSubtype(p.type)
: null;
} else {
return getRestrictedWithoutNull(p.type);
}
})
.put(
"isDefAndNotNull",
p -> {
if (p.outcome) {
return getRestrictedWithoutUndefined(getRestrictedWithoutNull(p.type));
} else {
return p.type != null
? getNativeType(NULL_VOID).getGreatestSubtype(p.type)
: null;
}
})
.put("isString", p -> getRestrictedByTypeOfResult(p.type, "string", p.outcome))
.put("isBoolean", p -> getRestrictedByTypeOfResult(p.type, "boolean", p.outcome))
.put("isNumber", p -> getRestrictedByTypeOfResult(p.type, "number", p.outcome))
.put("isFunction", p -> getRestrictedByTypeOfResult(p.type, "function", p.outcome))
.put(
"isArray",
p -> {
if (p.type == null) {
return p.outcome ? getNativeType(ARRAY_TYPE) : null;
}
Visitor<JSType> visitor =
p.outcome ? restrictToArrayVisitor : restrictToNotArrayVisitor;
return p.type.visit(visitor);
})
.put(
"isObject",
p -> {
if (p.type == null) {
return p.outcome ? getNativeType(OBJECT_TYPE) : null;
}
Visitor<JSType> visitor =
p.outcome ? restrictToObjectVisitor : restrictToNotObjectVisitor;
return p.type.visit(visitor);
})
.build();
}
@Override
public FlowScope getPreciserScopeKnowingConditionOutcome(Node condition,
FlowScope blindScope, boolean outcome) {
if (condition.isCall() && condition.hasTwoChildren()) {
Node callee = condition.getFirstChild();
Node param = condition.getLastChild();
if (callee.isGetProp() && param.isQualifiedName()) {
JSType paramType = getTypeIfRefinable(param, blindScope);
Node left = callee.getFirstChild();
Node right = callee.getLastChild();
if (left.isName() && "goog".equals(left.getString()) &&
right.isString()) {
Function<TypeRestriction, JSType> restricter =
restricters.get(right.getString());
if (restricter != null) {
return restrictParameter(param, paramType, blindScope, restricter,
outcome);
}
}
}
}
return nextPreciserScopeKnowingConditionOutcome(
condition, blindScope, outcome);
}
@CheckReturnValue
private FlowScope restrictParameter(
Node parameter,
JSType type,
FlowScope blindScope,
Function<TypeRestriction, JSType> restriction,
boolean outcome) {
// restricting
type = restriction.apply(new TypeRestriction(type, outcome));
// changing the scope
if (type != null) {
return declareNameInScope(blindScope, parameter, type);
} else {
return blindScope;
}
}
private static class TypeRestriction {
private final JSType type;
private final boolean outcome;
private TypeRestriction(JSType type, boolean outcome) {
this.type = type;
this.outcome = outcome;
}
}
}