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// Copyright 2014 Google Inc. All rights reserved.
//
// 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.devtools.build.lib.packages;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.LabelValidator;
import com.google.devtools.build.lib.vfs.PathFragment;
/**
* A class that represents some packages that are included in the visibility list of a rule.
*/
public abstract class PackageSpecification {
private static final String PACKAGE_LABEL = "__pkg__";
private static final String SUBTREE_LABEL = "__subpackages__";
private static final String ALL_BENEATH_SUFFIX = "/...";
public static final PackageSpecification EVERYTHING =
new AllPackagesBeneath(new PathFragment(""));
public abstract boolean containsPackage(PathFragment packageName);
@Override
public int hashCode() {
return toString().hashCode();
}
@Override
public boolean equals(Object that) {
if (this == that) {
return true;
}
if (!(that instanceof PackageSpecification)) {
return false;
}
return this.toString().equals(that.toString());
}
/**
* Parses a string as a visibility specification.
* Throws {@link InvalidPackageSpecificationException} if the label cannot be parsed.
*
* <p>Note that these strings are different from what {@link #fromLabel} understands.
*/
public static PackageSpecification fromString(final String spec)
throws InvalidPackageSpecificationException {
String result = spec;
boolean allBeneath = false;
if (result.startsWith("//")) {
result = spec.substring(2);
} else {
throw new InvalidPackageSpecificationException("invalid package label: " + spec);
}
if (result.indexOf(':') >= 0) {
throw new InvalidPackageSpecificationException("invalid package label: " + spec);
}
if (result.equals("...")) {
// Special case: //... will not end in /...
return EVERYTHING;
}
if (result.endsWith(ALL_BENEATH_SUFFIX)) {
allBeneath = true;
result = result.substring(0, result.length() - ALL_BENEATH_SUFFIX.length());
}
String errorMessage = LabelValidator.validatePackageName(result);
if (errorMessage == null) {
return allBeneath ?
new AllPackagesBeneath(new PathFragment(result)) :
new SinglePackage(new PathFragment(result));
} else {
throw new InvalidPackageSpecificationException(errorMessage);
}
}
/**
* Parses a label as a visibility specification. returns null if the label cannot be parsed.
*
* <p>Note that these strings are different from what {@link #fromString} understands.
*/
public static PackageSpecification fromLabel(Label label) {
if (label.getName().equals(PACKAGE_LABEL)) {
return new SinglePackage(label.getPackageFragment());
} else if (label.getName().equals(SUBTREE_LABEL)) {
return new AllPackagesBeneath(label.getPackageFragment());
} else {
return null;
}
}
private static class SinglePackage extends PackageSpecification {
private PathFragment singlePackageName;
public SinglePackage(PathFragment packageName) {
this.singlePackageName = packageName;
}
@Override
public boolean containsPackage(PathFragment packageName) {
return this.singlePackageName.equals(packageName);
}
@Override
public String toString() {
return singlePackageName.toString();
}
}
private static class AllPackagesBeneath extends PackageSpecification {
private PathFragment prefix;
public AllPackagesBeneath(PathFragment prefix) {
this.prefix = prefix;
}
@Override
public boolean containsPackage(PathFragment packageName) {
return packageName.startsWith(prefix);
}
@Override
public String toString() {
return prefix.equals(new PathFragment("")) ? "..." : prefix + "/...";
}
}
/**
* Exception class to be thrown when a specification cannot be parsed.
*/
public static class InvalidPackageSpecificationException extends Exception {
public InvalidPackageSpecificationException(String message) {
super(message);
}
}
}
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