116 lines
2.6 KiB
Go
116 lines
2.6 KiB
Go
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package android
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import (
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"runtime"
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"sort"
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"strings"
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)
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func JoinWithPrefix(strs []string, prefix string) string {
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if len(strs) == 0 {
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return ""
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}
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if len(strs) == 1 {
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return prefix + strs[0]
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}
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n := len(" ") * (len(strs) - 1)
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for _, s := range strs {
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n += len(prefix) + len(s)
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}
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ret := make([]byte, 0, n)
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for i, s := range strs {
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if i != 0 {
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ret = append(ret, ' ')
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}
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ret = append(ret, prefix...)
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ret = append(ret, s...)
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}
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return string(ret)
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}
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func sortedKeys(m map[string][]string) []string {
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s := make([]string, 0, len(m))
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for k := range m {
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s = append(s, k)
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}
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sort.Strings(s)
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return s
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}
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func indexList(s string, list []string) int {
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for i, l := range list {
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if l == s {
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return i
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}
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}
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return -1
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}
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func inList(s string, list []string) bool {
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return indexList(s, list) != -1
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}
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// checkCalledFromInit panics if a Go package's init function is not on the
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// call stack.
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func checkCalledFromInit() {
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for skip := 3; ; skip++ {
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_, funcName, ok := callerName(skip)
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if !ok {
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panic("not called from an init func")
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}
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if funcName == "init" || strings.HasPrefix(funcName, "init·") {
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return
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}
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}
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}
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// callerName returns the package path and function name of the calling
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// function. The skip argument has the same meaning as the skip argument of
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// runtime.Callers.
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func callerName(skip int) (pkgPath, funcName string, ok bool) {
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var pc [1]uintptr
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n := runtime.Callers(skip+1, pc[:])
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if n != 1 {
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return "", "", false
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}
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f := runtime.FuncForPC(pc[0])
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fullName := f.Name()
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lastDotIndex := strings.LastIndex(fullName, ".")
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if lastDotIndex == -1 {
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panic("unable to distinguish function name from package")
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}
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if fullName[lastDotIndex-1] == ')' {
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// The caller is a method on some type, so it's name looks like
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// "pkg/path.(type).method". We need to go back one dot farther to get
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// to the package name.
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lastDotIndex = strings.LastIndex(fullName[:lastDotIndex], ".")
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}
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pkgPath = fullName[:lastDotIndex]
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funcName = fullName[lastDotIndex+1:]
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ok = true
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return
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}
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