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// Copyright 2017 The Bazel Authors. 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.vfs;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
@VisibleForTesting
class UnixOsPathPolicy implements OsPathPolicy {
static final UnixOsPathPolicy INSTANCE = new UnixOsPathPolicy();
private static final Splitter PATH_SPLITTER = Splitter.onPattern("/+").omitEmptyStrings();
@Override
public int needsToNormalize(String path) {
int n = path.length();
int dotCount = 0;
char prevChar = 0;
for (int i = 0; i < n; i++) {
char c = path.charAt(i);
if (c == '\\') {
return NEEDS_NORMALIZE;
}
if (c == '/') {
if (prevChar == '/') {
return NEEDS_NORMALIZE;
}
if (dotCount == 1 || dotCount == 2) {
return NEEDS_NORMALIZE;
}
}
dotCount = c == '.' ? dotCount + 1 : 0;
prevChar = c;
}
if (prevChar == '/' || dotCount == 1 || dotCount == 2) {
return NEEDS_NORMALIZE;
}
return NORMALIZED;
}
@Override
public int needsToNormalizeSuffix(String normalizedSuffix) {
// We know that the string is normalized
// In this case only suffixes starting with ".." may cause
// normalization once concatenated with other strings
return normalizedSuffix.startsWith("..") ? NEEDS_NORMALIZE : NORMALIZED;
}
@Override
public String normalize(String path, int normalizationLevel) {
if (normalizationLevel == NORMALIZED) {
return path;
}
if (path.isEmpty()) {
return path;
}
boolean isAbsolute = path.charAt(0) == '/';
StringBuilder sb = new StringBuilder(path.length());
if (isAbsolute) {
sb.append('/');
}
String[] segments = Iterables.toArray(PATH_SPLITTER.splitToList(path), String.class);
int segmentCount = Utils.removeRelativePaths(segments, 0, isAbsolute);
for (int i = 0; i < segmentCount; ++i) {
sb.append(segments[i]);
sb.append('/');
}
if (segmentCount > 0) {
sb.deleteCharAt(sb.length() - 1);
}
return sb.toString();
}
@Override
public int getDriveStrLength(String path) {
if (path.length() == 0) {
return 0;
}
return (path.charAt(0) == '/') ? 1 : 0;
}
@Override
public int compare(String s1, String s2) {
return s1.compareTo(s2);
}
@Override
public int compare(char c1, char c2) {
return Character.compare(c1, c2);
}
@Override
public boolean equals(String s1, String s2) {
return s1.equals(s2);
}
@Override
public int hash(String s) {
return s.hashCode();
}
@Override
public boolean startsWith(String path, String prefix) {
return path.startsWith(prefix);
}
@Override
public boolean endsWith(String path, String suffix) {
return path.endsWith(suffix);
}
@Override
public char getSeparator() {
return '/';
}
@Override
public boolean isSeparator(char c) {
return c == '/';
}
@Override
public boolean isCaseSensitive() {
return true;
}
}
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