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TypeMatchingStrategy.java
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TypeMatchingStrategy.java
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/*
* Copyright 2015 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;
import com.google.javascript.rhino.TypeI;
/**
* The different strategies for matching the {@code TypeI} of nodes.
*/
public enum TypeMatchingStrategy {
/**
* Matches type or any subtype. Matches types with different nullability/voidability. Allows loose
* matches.
*/
LOOSE(true, true, true),
/**
* Matches type or any subtype. Does not match types with different nullability/voidability.
* Allows loose matches.
*/
STRICT_NULLABILITY(true, false, true),
/**
* Matches type or any subtype. Does not match types with different nullability/voidability.
* Does not allow loose matches.
*/
SUBTYPES(true, false, false),
/**
* Does not match subtypes. Does not match types with different nullability/voidability. Does not
* allow loose matches.
*/
EXACT(false, false, false);
private final boolean allowSubtypes;
private final boolean ignoreNullability;
private final boolean allowLooseMatches;
private TypeMatchingStrategy(
boolean allowSubtypes, boolean ignoreNullability, boolean allowLooseMatches) {
this.allowSubtypes = allowSubtypes;
this.ignoreNullability = ignoreNullability;
this.allowLooseMatches = allowLooseMatches;
}
public MatchResult match(TypeI templateType, TypeI type) {
if (templateType.isUnknownType()) {
// If the template type is '?', then any type is a match and this is not considered a loose
// match.
return new MatchResult(true, false);
}
if (type == null || type.isUnknownType() || type.isTop()) {
return new MatchResult(allowLooseMatches, allowLooseMatches);
}
if (allowSubtypes) {
if (ignoreNullability) {
type = type.restrictByNotNullOrUndefined();
}
if (type.isSubtypeOf(templateType)) {
return new MatchResult(true, false);
}
}
boolean nullableMismatch = templateType.isNullable() != type.isNullable();
boolean voidableMismatch = templateType.isVoidable() != type.isVoidable();
if (!ignoreNullability && (nullableMismatch || voidableMismatch)) {
return new MatchResult(false, false);
}
return new MatchResult(type.isEquivalentTo(templateType), false);
}
/**
* The result of comparing two different {@code TypeI} instances.
*/
public static class MatchResult {
private final boolean isMatch;
private final boolean isLooseMatch;
public MatchResult(boolean isMatch, boolean isLooseMatch) {
this.isMatch = isMatch;
this.isLooseMatch = isLooseMatch;
}
public boolean isMatch() {
return isMatch;
}
public boolean isLooseMatch() {
return isLooseMatch;
}
}
}