/*
* Copyright 2014 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.common.collect.ImmutableMap;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSDocInfo.Visibility;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.ObjectTypeI;
import com.google.javascript.rhino.StaticSourceFile;
import com.google.javascript.rhino.TypeI;
import javax.annotation.Nullable;
/**
* Helper functions for computing the visibility of names and properties
* in JavaScript source code.
*
* @author brndn@google.com (Brendan Linn)
* @see CheckAccessControls
*/
public final class AccessControlUtils {
/** Non-instantiable. */
private AccessControlUtils() {}
/**
* Returns the effective visibility of the given name. This can differ
* from the name's declared visibility if the file's {@code @fileoverview}
* JsDoc specifies a default visibility.
*
* @param name The name node to compute effective visibility for.
* @param var The name to compute effective visibility for.
* @param fileVisibilityMap A map of {@code @fileoverview} visibility
* annotations, used to compute the name's default visibility.
*/
static Visibility getEffectiveNameVisibility(Node name, Var var,
ImmutableMap<StaticSourceFile, Visibility> fileVisibilityMap) {
JSDocInfo jsDocInfo = var.getJSDocInfo();
Visibility raw = (jsDocInfo == null || jsDocInfo.getVisibility() == null)
? Visibility.INHERITED
: jsDocInfo.getVisibility();
if (raw != Visibility.INHERITED) {
return raw;
}
Visibility defaultVisibilityForFile =
fileVisibilityMap.get(var.getSourceFile());
TypeI type = name.getTypeI();
boolean createdFromGoogProvide = (type != null && type.isLiteralObject());
// Ignore @fileoverview visibility when computing the effective visibility
// for names created by goog.provide.
//
// ProcessClosurePrimitives rewrites goog.provide()s as object literal
// declarations, but the exact form depends on the ordering of the
// input files. If goog.provide('a.b') occurs in the inputs before
// goog.provide('a'), it is rewritten like
//
// var a={};a.b={};
//
// If the file containing goog.provide('a.b') also declares a @fileoverview
// visibility, it must not apply to a, as this would make every a.* namespace
// effectively package-private.
return (createdFromGoogProvide || defaultVisibilityForFile == null)
? raw
: defaultVisibilityForFile;
}
/**
* Returns the effective visibility of the given property. This can differ
* from the property's declared visibility if the property is inherited from
* a superclass, or if the file's {@code @fileoverview} JsDoc specifies
* a default visibility.
*
* @param property The property to compute effective visibility for.
* @param referenceType The JavaScript type of the property.
* @param fileVisibilityMap A map of {@code @fileoverview} visibility
* annotations, used to compute the property's default visibility.
* @param codingConvention The coding convention in effect (if any),
* used to determine whether the property is private by lexical convention
* (example: trailing underscore).
*/
static Visibility getEffectivePropertyVisibility(
Node property,
ObjectTypeI referenceType,
ImmutableMap<StaticSourceFile, Visibility> fileVisibilityMap,
@Nullable CodingConvention codingConvention) {
String propertyName = property.getLastChild().getString();
StaticSourceFile definingSource = getDefiningSource(
property, referenceType, propertyName);
Visibility fileOverviewVisibility = fileVisibilityMap.get(definingSource);
Node parent = property.getParent();
boolean isOverride = parent.getJSDocInfo() != null
&& parent.isAssign()
&& parent.getFirstChild() == property;
ObjectTypeI objectType = getObjectType(
referenceType, isOverride, propertyName);
if (isOverride) {
Visibility overridden = getOverriddenPropertyVisibility(
objectType, propertyName);
return getEffectiveVisibilityForOverriddenProperty(
overridden, fileOverviewVisibility, propertyName, codingConvention);
} else {
return getEffectiveVisibilityForNonOverriddenProperty(
property, objectType, fileOverviewVisibility, codingConvention);
}
}
/**
* Returns the source file in which the given property is defined,
* or null if it is not known.
*/
@Nullable static StaticSourceFile getDefiningSource(
Node getprop, @Nullable ObjectTypeI referenceType, String propertyName) {
if (referenceType != null) {
Node propDefNode = referenceType.getPropertyDefSite(propertyName);
if (propDefNode != null) {
return propDefNode.getStaticSourceFile();
}
}
return getprop.getStaticSourceFile();
}
/**
* Returns the lowest property defined on a class with visibility information.
*/
@Nullable static ObjectTypeI getObjectType(
@Nullable ObjectTypeI referenceType,
boolean isOverride,
String propertyName) {
if (referenceType == null) {
return null;
}
// Find the lowest property defined on a class with visibility information.
ObjectTypeI current = isOverride ? referenceType.getPrototypeObject() : referenceType;
for (; current != null; current = current.getPrototypeObject()) {
JSDocInfo docInfo = current.getOwnPropertyJSDocInfo(propertyName);
if (docInfo != null && docInfo.getVisibility() != Visibility.INHERITED) {
return current;
}
}
return null;
}
/**
* Returns the original visibility of an overridden property.
*/
private static Visibility getOverriddenPropertyVisibility(
ObjectTypeI objectType, String propertyName) {
return objectType != null
? objectType.getOwnPropertyJSDocInfo(propertyName).getVisibility()
: Visibility.INHERITED;
}
/**
* Returns the effective visibility of the given overridden property.
* An overridden propertiy inherits the visibility of the property it
* overrides.
*/
private static Visibility getEffectiveVisibilityForOverriddenProperty(
Visibility visibility,
@Nullable Visibility fileOverviewVisibility,
String propertyName,
@Nullable CodingConvention codingConvention) {
if (codingConvention != null && codingConvention.isPrivate(propertyName)) {
return Visibility.PRIVATE;
}
return (fileOverviewVisibility != null
&& visibility == Visibility.INHERITED)
? fileOverviewVisibility
: visibility;
}
/**
* Returns the effective visibility of the given non-overridden property.
* Non-overridden properties without an explicit visibility annotation
* receive the default visibility declared in the file's {@code @fileoverview}
* block, if one exists.
*/
private static Visibility getEffectiveVisibilityForNonOverriddenProperty(
Node getprop,
ObjectTypeI objectType,
@Nullable Visibility fileOverviewVisibility,
@Nullable CodingConvention codingConvention) {
String propertyName = getprop.getLastChild().getString();
if (codingConvention != null && codingConvention.isPrivate(propertyName)) {
return Visibility.PRIVATE;
}
Visibility raw = Visibility.INHERITED;
if (objectType != null) {
raw = objectType.getOwnPropertyJSDocInfo(propertyName).getVisibility();
}
TypeI type = getprop.getTypeI();
boolean createdFromGoogProvide = (type != null && type.isLiteralObject());
// Ignore @fileoverview visibility when computing the effective visibility
// for properties created by goog.provide.
//
// ProcessClosurePrimitives rewrites goog.provide()s as object literal
// declarations, but the exact form depends on the ordering of the
// input files. If goog.provide('a.b.c') occurs in the inputs before
// goog.provide('a'), it is rewritten like
//
// var a={};a.b={}a.b.c={};
//
// If the file containing goog.provide('a.b.c') also declares
// a @fileoverview visibility, it must not apply to b, as this would make
// every a.b.* namespace effectively package-private.
return (raw != Visibility.INHERITED
|| fileOverviewVisibility == null
|| createdFromGoogProvide)
? raw
: fileOverviewVisibility;
}
}