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// Copyright 2015 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 android
import (
"runtime"
"sort"
"strings"
)
func JoinWithPrefix(strs []string, prefix string) string {
if len(strs) == 0 {
return ""
}
if len(strs) == 1 {
return prefix + strs[0]
}
n := len(" ") * (len(strs) - 1)
for _, s := range strs {
n += len(prefix) + len(s)
}
ret := make([]byte, 0, n)
for i, s := range strs {
if i != 0 {
ret = append(ret, ' ')
}
ret = append(ret, prefix...)
ret = append(ret, s...)
}
return string(ret)
}
func sortedKeys(m map[string][]string) []string {
s := make([]string, 0, len(m))
for k := range m {
s = append(s, k)
}
sort.Strings(s)
return s
}
func indexList(s string, list []string) int {
for i, l := range list {
if l == s {
return i
}
}
return -1
}
func inList(s string, list []string) bool {
return indexList(s, list) != -1
}
// checkCalledFromInit panics if a Go package's init function is not on the
// call stack.
func checkCalledFromInit() {
for skip := 3; ; skip++ {
_, funcName, ok := callerName(skip)
if !ok {
panic("not called from an init func")
}
if funcName == "init" || strings.HasPrefix(funcName, "init·") {
return
}
}
}
// callerName returns the package path and function name of the calling
// function. The skip argument has the same meaning as the skip argument of
// runtime.Callers.
func callerName(skip int) (pkgPath, funcName string, ok bool) {
var pc [1]uintptr
n := runtime.Callers(skip+1, pc[:])
if n != 1 {
return "", "", false
}
f := runtime.FuncForPC(pc[0])
fullName := f.Name()
lastDotIndex := strings.LastIndex(fullName, ".")
if lastDotIndex == -1 {
panic("unable to distinguish function name from package")
}
if fullName[lastDotIndex-1] == ')' {
// The caller is a method on some type, so it's name looks like
// "pkg/path.(type).method". We need to go back one dot farther to get
// to the package name.
lastDotIndex = strings.LastIndex(fullName[:lastDotIndex], ".")
}
pkgPath = fullName[:lastDotIndex]
funcName = fullName[lastDotIndex+1:]
ok = true
return
}
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