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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.android.ide.common.res2;
import static com.android.SdkConstants.DOT_9PNG;
import static com.android.SdkConstants.DOT_XML;
import static com.android.SdkConstants.DOT_XSD;
import com.android.annotations.NonNull;
import com.android.annotations.Nullable;
import com.android.resources.ResourceType;
import com.android.utils.SdkUtils;
import java.io.File;
import java.util.List;
import javax.lang.model.SourceVersion;
public final class FileResourceNameValidator {
private FileResourceNameValidator() {
}
/**
* Validate a single-file resource name.
*
* @param file the file resource to validate.
* @param resourceType the resource type.
* @throws MergingException is the resource name is not valid.
*/
public static void validate(@NonNull File file, @NonNull ResourceType resourceType)
throws MergingException {
String error = getErrorTextForFileResource(file.getName(), resourceType);
if (error != null) {
throw MergingException.withMessage(error).withFile(file).build();
}
}
/**
* Validate a single-file resource name.
*
* @param fileNameWithExt the resource file name to validate.
* @param resourceType the resource type.
* @return null if no error, otherwise a string describing the error.
*/
@Nullable
public static String getErrorTextForFileResource(@NonNull final String fileNameWithExt,
@NonNull final ResourceType resourceType) {
return getErrorTextForFileResource(fileNameWithExt, resourceType, false);
}
/**
* Validate a file-based resource name as it is being typed in a text field.
*
* Partial or no extensions are allowed, so the user does not see errors while typing.
*
* @param partialFileNameWithExt the resource file name or prefix of file name to validate.
* @param resourceType the resource type.
* @return null if no error, otherwise a string describing the error.
*/
@Nullable
public static String getErrorTextForPartialName(
@NonNull final String partialFileNameWithExt,
@NonNull final ResourceType resourceType) {
return getErrorTextForFileResource(partialFileNameWithExt, resourceType, true);
}
@Nullable
private static String getErrorTextForFileResource(@NonNull final String fileNameWithExt,
@NonNull final ResourceType resourceType, boolean allowPartialOrMissingExtension) {
if (fileNameWithExt.trim().isEmpty()) {
return "Resource must have a name";
}
final String fileName;
if (resourceType == ResourceType.RAW) {
// Allow any single file extension.
fileName = removeSingleExtension(fileNameWithExt);
} else if (resourceType == ResourceType.DRAWABLE | resourceType == ResourceType.MIPMAP) {
// Require either an image or xml file extension
if (SdkUtils.endsWithIgnoreCase(fileNameWithExt, DOT_XML)) {
fileName = fileNameWithExt
.substring(0, fileNameWithExt.length() - DOT_XML.length());
} else if (SdkUtils.hasImageExtension(fileNameWithExt)) {
if (SdkUtils.endsWithIgnoreCase(fileNameWithExt, DOT_9PNG)) {
fileName = fileNameWithExt
.substring(0, fileNameWithExt.length() - DOT_9PNG.length());
} else {
fileName = fileNameWithExt.substring(0, fileNameWithExt.lastIndexOf('.'));
}
} else {
if (!allowPartialOrMissingExtension) {
return "The file name must end with .xml or .png";
} else {
String possibleFileName = removeSingleExtension(fileNameWithExt);
if (possibleFileName.endsWith(".9")) {
fileName = removeSingleExtension(possibleFileName);
} else {
fileName = possibleFileName;
}
String ext = fileNameWithExt.substring(fileName.length());
if (!SdkUtils.startsWithIgnoreCase(DOT_XML, ext) &&
!oneOfStartsWithIgnoreCase(SdkUtils.IMAGE_EXTENSIONS, ext)) {
return "The file name must end with .xml or .png";
}
}
}
} else if (resourceType == ResourceType.XML) {
// Also allow xsd as they are xml files.
if (SdkUtils.endsWithIgnoreCase(fileNameWithExt, DOT_XML) ||
SdkUtils.endsWithIgnoreCase(fileNameWithExt, DOT_XSD)) {
fileName = removeSingleExtension(fileNameWithExt);
} else {
if (!allowPartialOrMissingExtension) {
return "The file name must end with .xml";
} else {
fileName = removeSingleExtension(fileNameWithExt);
String ext = fileNameWithExt.substring(fileName.length());
if (!SdkUtils.startsWithIgnoreCase(DOT_XML, ext) &&
!SdkUtils.startsWithIgnoreCase(DOT_XSD, ext)) {
return "The file name must end with .xml";
}
}
}
} else {
// Require xml extension
if (SdkUtils.endsWithIgnoreCase(fileNameWithExt, DOT_XML)) {
fileName = fileNameWithExt
.substring(0, fileNameWithExt.length() - DOT_XML.length());
} else {
if (!allowPartialOrMissingExtension) {
return "The file name must end with .xml";
} else {
fileName = removeSingleExtension(fileNameWithExt);
String ext = fileNameWithExt.substring(fileName.length());
if (!SdkUtils.startsWithIgnoreCase(DOT_XML, ext)) {
return "The file name must end with .xml";
}
}
}
}
return getErrorTextForNameWithoutExtension(fileName);
}
/**
* Validate a single-file resource name.
*
* @param fileNameWithoutExt The resource file name to validate, without an extension.
* @return null if no error, otherwise a string describing the error.
*/
@Nullable
public static String getErrorTextForNameWithoutExtension(
@NonNull final String fileNameWithoutExt) {
char first = fileNameWithoutExt.charAt(0);
if (!Character.isJavaIdentifierStart(first)) {
return "The resource name must start with a letter";
}
// AAPT only allows lowercase+digits+_:
// "%s: Invalid file name: must contain only [a-z0-9_.]","
for (int i = 0, n = fileNameWithoutExt.length(); i < n; i++) {
char c = fileNameWithoutExt.charAt(i);
if (!((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '_')) {
return String.format("'%1$c' is not a valid file-based resource name character: "
+ "File-based resource names must contain only lowercase a-z, 0-9,"
+ " or underscore", c);
}
}
if (SourceVersion.isKeyword(fileNameWithoutExt)) {
return String.format("%1$s is not a valid resource name (reserved Java keyword)",
fileNameWithoutExt);
}
// Success!
return null;
}
private static String removeSingleExtension(String fileNameWithExt) {
int lastDot = fileNameWithExt.lastIndexOf('.');
if (lastDot != -1) {
return fileNameWithExt.substring(0, lastDot);
} else {
return fileNameWithExt;
}
}
private static boolean oneOfStartsWithIgnoreCase(List strings, String prefix) {
boolean matches = false;
for (String allowedString : strings) {
if (SdkUtils.startsWithIgnoreCase(allowedString, prefix)) {
matches = true;
break;
}
}
return matches;
}
}
