ceph-csi/vendor/github.com/antlr4-go/antlr/v4/utils.go

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// Copyright (c) 2012-2022 The ANTLR Project. All rights reserved.
// Use of this file is governed by the BSD 3-clause license that
// can be found in the LICENSE.txt file in the project root.
package antlr
import (
"bytes"
"errors"
"fmt"
"math/bits"
"os"
"strconv"
"strings"
"syscall"
)
func intMin(a, b int) int {
if a < b {
return a
}
return b
}
func intMax(a, b int) int {
if a > b {
return a
}
return b
}
// A simple integer stack
type IntStack []int
var ErrEmptyStack = errors.New("stack is empty")
func (s *IntStack) Pop() (int, error) {
l := len(*s) - 1
if l < 0 {
return 0, ErrEmptyStack
}
v := (*s)[l]
*s = (*s)[0:l]
return v, nil
}
func (s *IntStack) Push(e int) {
*s = append(*s, e)
}
const bitsPerWord = 64
func indexForBit(bit int) int {
return bit / bitsPerWord
}
//goland:noinspection GoUnusedExportedFunction,GoUnusedFunction
func wordForBit(data []uint64, bit int) uint64 {
idx := indexForBit(bit)
if idx >= len(data) {
return 0
}
return data[idx]
}
func maskForBit(bit int) uint64 {
return uint64(1) << (bit % bitsPerWord)
}
func wordsNeeded(bit int) int {
return indexForBit(bit) + 1
}
type BitSet struct {
data []uint64
}
// NewBitSet creates a new bitwise set
// TODO: See if we can replace with the standard library's BitSet
func NewBitSet() *BitSet {
return &BitSet{}
}
func (b *BitSet) add(value int) {
idx := indexForBit(value)
if idx >= len(b.data) {
size := wordsNeeded(value)
data := make([]uint64, size)
copy(data, b.data)
b.data = data
}
b.data[idx] |= maskForBit(value)
}
func (b *BitSet) clear(index int) {
idx := indexForBit(index)
if idx >= len(b.data) {
return
}
b.data[idx] &= ^maskForBit(index)
}
func (b *BitSet) or(set *BitSet) {
// Get min size necessary to represent the bits in both sets.
bLen := b.minLen()
setLen := set.minLen()
maxLen := intMax(bLen, setLen)
if maxLen > len(b.data) {
// Increase the size of len(b.data) to represent the bits in both sets.
data := make([]uint64, maxLen)
copy(data, b.data)
b.data = data
}
// len(b.data) is at least setLen.
for i := 0; i < setLen; i++ {
b.data[i] |= set.data[i]
}
}
func (b *BitSet) remove(value int) {
b.clear(value)
}
func (b *BitSet) contains(value int) bool {
idx := indexForBit(value)
if idx >= len(b.data) {
return false
}
return (b.data[idx] & maskForBit(value)) != 0
}
func (b *BitSet) minValue() int {
for i, v := range b.data {
if v == 0 {
continue
}
return i*bitsPerWord + bits.TrailingZeros64(v)
}
return 2147483647
}
func (b *BitSet) equals(other interface{}) bool {
otherBitSet, ok := other.(*BitSet)
if !ok {
return false
}
if b == otherBitSet {
return true
}
// We only compare set bits, so we cannot rely on the two slices having the same size. Its
// possible for two BitSets to have different slice lengths but the same set bits. So we only
// compare the relevant words and ignore the trailing zeros.
bLen := b.minLen()
otherLen := otherBitSet.minLen()
if bLen != otherLen {
return false
}
for i := 0; i < bLen; i++ {
if b.data[i] != otherBitSet.data[i] {
return false
}
}
return true
}
func (b *BitSet) minLen() int {
for i := len(b.data); i > 0; i-- {
if b.data[i-1] != 0 {
return i
}
}
return 0
}
func (b *BitSet) length() int {
cnt := 0
for _, val := range b.data {
cnt += bits.OnesCount64(val)
}
return cnt
}
func (b *BitSet) String() string {
vals := make([]string, 0, b.length())
for i, v := range b.data {
for v != 0 {
n := bits.TrailingZeros64(v)
vals = append(vals, strconv.Itoa(i*bitsPerWord+n))
v &= ^(uint64(1) << n)
}
}
return "{" + strings.Join(vals, ", ") + "}"
}
type AltDict struct {
data map[string]interface{}
}
func NewAltDict() *AltDict {
d := new(AltDict)
d.data = make(map[string]interface{})
return d
}
func (a *AltDict) Get(key string) interface{} {
key = "k-" + key
return a.data[key]
}
func (a *AltDict) put(key string, value interface{}) {
key = "k-" + key
a.data[key] = value
}
func (a *AltDict) values() []interface{} {
vs := make([]interface{}, len(a.data))
i := 0
for _, v := range a.data {
vs[i] = v
i++
}
return vs
}
func EscapeWhitespace(s string, escapeSpaces bool) string {
s = strings.Replace(s, "\t", "\\t", -1)
s = strings.Replace(s, "\n", "\\n", -1)
s = strings.Replace(s, "\r", "\\r", -1)
if escapeSpaces {
s = strings.Replace(s, " ", "\u00B7", -1)
}
return s
}
//goland:noinspection GoUnusedExportedFunction
func TerminalNodeToStringArray(sa []TerminalNode) []string {
st := make([]string, len(sa))
for i, s := range sa {
st[i] = fmt.Sprintf("%v", s)
}
return st
}
//goland:noinspection GoUnusedExportedFunction
func PrintArrayJavaStyle(sa []string) string {
var buffer bytes.Buffer
buffer.WriteString("[")
for i, s := range sa {
buffer.WriteString(s)
if i != len(sa)-1 {
buffer.WriteString(", ")
}
}
buffer.WriteString("]")
return buffer.String()
}
// murmur hash
func murmurInit(seed int) int {
return seed
}
func murmurUpdate(h int, value int) int {
const c1 uint32 = 0xCC9E2D51
const c2 uint32 = 0x1B873593
const r1 uint32 = 15
const r2 uint32 = 13
const m uint32 = 5
const n uint32 = 0xE6546B64
k := uint32(value)
k *= c1
k = (k << r1) | (k >> (32 - r1))
k *= c2
hash := uint32(h) ^ k
hash = (hash << r2) | (hash >> (32 - r2))
hash = hash*m + n
return int(hash)
}
func murmurFinish(h int, numberOfWords int) int {
var hash = uint32(h)
hash ^= uint32(numberOfWords) << 2
hash ^= hash >> 16
hash *= 0x85ebca6b
hash ^= hash >> 13
hash *= 0xc2b2ae35
hash ^= hash >> 16
return int(hash)
}
func isDirectory(dir string) (bool, error) {
fileInfo, err := os.Stat(dir)
if err != nil {
switch {
case errors.Is(err, syscall.ENOENT):
// The given directory does not exist, so we will try to create it
//
err = os.MkdirAll(dir, 0755)
if err != nil {
return false, err
}
return true, nil
case err != nil:
return false, err
default:
}
}
return fileInfo.IsDir(), err
}