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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 (
"fmt"
"regexp"
"runtime"
"sort"
"strings"
)
// CopyOf returns a new slice that has the same contents as s.
func CopyOf(s []string) []string {
return append([]string(nil), s...)
}
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
}
func PrefixInList(s string, list []string) bool {
for _, prefix := range list {
if strings.HasPrefix(s, prefix) {
return true
}
}
return false
}
func FilterList(list []string, filter []string) (remainder []string, filtered []string) {
for _, l := range list {
if InList(l, filter) {
filtered = append(filtered, l)
} else {
remainder = append(remainder, l)
}
}
return
}
func RemoveListFromList(list []string, filter_out []string) (result []string) {
result = make([]string, 0, len(list))
for _, l := range list {
if !InList(l, filter_out) {
result = append(result, l)
}
}
return
}
func RemoveFromList(s string, list []string) (bool, []string) {
i := IndexList(s, list)
if i == -1 {
return false, list
}
result := make([]string, 0, len(list)-1)
result = append(result, list[:i]...)
for _, l := range list[i+1:] {
if l != s {
result = append(result, l)
}
}
return true, result
}
// FirstUniqueStrings returns all unique elements of a slice of strings, keeping the first copy of
// each. It modifies the slice contents in place, and returns a subslice of the original slice.
func FirstUniqueStrings(list []string) []string {
k := 0
outer:
for i := 0; i < len(list); i++ {
for j := 0; j < k; j++ {
if list[i] == list[j] {
continue outer
}
}
list[k] = list[i]
k++
}
return list[:k]
}
// LastUniqueStrings returns all unique elements of a slice of strings, keeping the last copy of
// each. It modifies the slice contents in place, and returns a subslice of the original slice.
func LastUniqueStrings(list []string) []string {
totalSkip := 0
for i := len(list) - 1; i >= totalSkip; i-- {
skip := 0
for j := i - 1; j >= totalSkip; j-- {
if list[i] == list[j] {
skip++
} else {
list[j+skip] = list[j]
}
}
totalSkip += skip
}
return list[totalSkip:]
}
// 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·") ||
strings.HasPrefix(funcName, "init.") {
return
}
}
}
// A regex to find a package path within a function name. It finds the shortest string that is
// followed by '.' and doesn't have any '/'s left.
var pkgPathRe = regexp.MustCompile(`^(.*?)\.([^/]+)$`)
// 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]).Name()
s := pkgPathRe.FindStringSubmatch(f)
if len(s) < 3 {
panic(fmt.Errorf("failed to extract package path and function name from %q", f))
}
return s[1], s[2], true
}
func GetNumericSdkVersion(v string) string {
if strings.Contains(v, "system_") {
return strings.Replace(v, "system_", "", 1)
}
return v
}
// copied from build/kati/strutil.go
func substPattern(pat, repl, str string) string {
ps := strings.SplitN(pat, "%", 2)
if len(ps) != 2 {
if str == pat {
return repl
}
return str
}
in := str
trimed := str
if ps[0] != "" {
trimed = strings.TrimPrefix(in, ps[0])
if trimed == in {
return str
}
}
in = trimed
if ps[1] != "" {
trimed = strings.TrimSuffix(in, ps[1])
if trimed == in {
return str
}
}
rs := strings.SplitN(repl, "%", 2)
if len(rs) != 2 {
return repl
}
return rs[0] + trimed + rs[1]
}
// copied from build/kati/strutil.go
func matchPattern(pat, str string) bool {
i := strings.IndexByte(pat, '%')
if i < 0 {
return pat == str
}
return strings.HasPrefix(str, pat[:i]) && strings.HasSuffix(str, pat[i+1:])
}