You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
327 lines
8.3 KiB
Go
327 lines
8.3 KiB
Go
2 years ago
|
//
|
||
|
|
// Copyright (c) 2011-2019 Canonical Ltd
|
||
|
|
//
|
||
|
|
// 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 yaml
|
||
|
|
|
||
|
|
import (
|
||
|
|
"encoding/base64"
|
||
|
|
"math"
|
||
|
|
"regexp"
|
||
|
|
"strconv"
|
||
|
|
"strings"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
type resolveMapItem struct {
|
||
|
|
value interface{}
|
||
|
|
tag string
|
||
|
|
}
|
||
|
|
|
||
|
|
var resolveTable = make([]byte, 256)
|
||
|
|
var resolveMap = make(map[string]resolveMapItem)
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
t := resolveTable
|
||
|
|
t[int('+')] = 'S' // Sign
|
||
|
|
t[int('-')] = 'S'
|
||
|
|
for _, c := range "0123456789" {
|
||
|
|
t[int(c)] = 'D' // Digit
|
||
|
|
}
|
||
|
|
for _, c := range "yYnNtTfFoO~" {
|
||
|
|
t[int(c)] = 'M' // In map
|
||
|
|
}
|
||
|
|
t[int('.')] = '.' // Float (potentially in map)
|
||
|
|
|
||
|
|
var resolveMapList = []struct {
|
||
|
|
v interface{}
|
||
|
|
tag string
|
||
|
|
l []string
|
||
|
|
}{
|
||
|
|
{true, boolTag, []string{"true", "True", "TRUE"}},
|
||
|
|
{false, boolTag, []string{"false", "False", "FALSE"}},
|
||
|
|
{nil, nullTag, []string{"", "~", "null", "Null", "NULL"}},
|
||
|
|
{math.NaN(), floatTag, []string{".nan", ".NaN", ".NAN"}},
|
||
|
|
{math.Inf(+1), floatTag, []string{".inf", ".Inf", ".INF"}},
|
||
|
|
{math.Inf(+1), floatTag, []string{"+.inf", "+.Inf", "+.INF"}},
|
||
|
|
{math.Inf(-1), floatTag, []string{"-.inf", "-.Inf", "-.INF"}},
|
||
|
|
{"<<", mergeTag, []string{"<<"}},
|
||
|
|
}
|
||
|
|
|
||
|
|
m := resolveMap
|
||
|
|
for _, item := range resolveMapList {
|
||
|
|
for _, s := range item.l {
|
||
|
|
m[s] = resolveMapItem{item.v, item.tag}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const (
|
||
|
|
nullTag = "!!null"
|
||
|
|
boolTag = "!!bool"
|
||
|
|
strTag = "!!str"
|
||
|
|
intTag = "!!int"
|
||
|
|
floatTag = "!!float"
|
||
|
|
timestampTag = "!!timestamp"
|
||
|
|
seqTag = "!!seq"
|
||
|
|
mapTag = "!!map"
|
||
|
|
binaryTag = "!!binary"
|
||
|
|
mergeTag = "!!merge"
|
||
|
|
)
|
||
|
|
|
||
|
|
var longTags = make(map[string]string)
|
||
|
|
var shortTags = make(map[string]string)
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
for _, stag := range []string{nullTag, boolTag, strTag, intTag, floatTag, timestampTag, seqTag, mapTag, binaryTag, mergeTag} {
|
||
|
|
ltag := longTag(stag)
|
||
|
|
longTags[stag] = ltag
|
||
|
|
shortTags[ltag] = stag
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const longTagPrefix = "tag:yaml.org,2002:"
|
||
|
|
|
||
|
|
func shortTag(tag string) string {
|
||
|
|
if strings.HasPrefix(tag, longTagPrefix) {
|
||
|
|
if stag, ok := shortTags[tag]; ok {
|
||
|
|
return stag
|
||
|
|
}
|
||
|
|
return "!!" + tag[len(longTagPrefix):]
|
||
|
|
}
|
||
|
|
return tag
|
||
|
|
}
|
||
|
|
|
||
|
|
func longTag(tag string) string {
|
||
|
|
if strings.HasPrefix(tag, "!!") {
|
||
|
|
if ltag, ok := longTags[tag]; ok {
|
||
|
|
return ltag
|
||
|
|
}
|
||
|
|
return longTagPrefix + tag[2:]
|
||
|
|
}
|
||
|
|
return tag
|
||
|
|
}
|
||
|
|
|
||
|
|
func resolvableTag(tag string) bool {
|
||
|
|
switch tag {
|
||
|
|
case "", strTag, boolTag, intTag, floatTag, nullTag, timestampTag:
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
var yamlStyleFloat = regexp.MustCompile(`^[-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)?$`)
|
||
|
|
|
||
|
|
func resolve(tag string, in string) (rtag string, out interface{}) {
|
||
|
|
tag = shortTag(tag)
|
||
|
|
if !resolvableTag(tag) {
|
||
|
|
return tag, in
|
||
|
|
}
|
||
|
|
|
||
|
|
defer func() {
|
||
|
|
switch tag {
|
||
|
|
case "", rtag, strTag, binaryTag:
|
||
|
|
return
|
||
|
|
case floatTag:
|
||
|
|
if rtag == intTag {
|
||
|
|
switch v := out.(type) {
|
||
|
|
case int64:
|
||
|
|
rtag = floatTag
|
||
|
|
out = float64(v)
|
||
|
|
return
|
||
|
|
case int:
|
||
|
|
rtag = floatTag
|
||
|
|
out = float64(v)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
failf("cannot decode %s `%s` as a %s", shortTag(rtag), in, shortTag(tag))
|
||
|
|
}()
|
||
|
|
|
||
|
|
// Any data is accepted as a !!str or !!binary.
|
||
|
|
// Otherwise, the prefix is enough of a hint about what it might be.
|
||
|
|
hint := byte('N')
|
||
|
|
if in != "" {
|
||
|
|
hint = resolveTable[in[0]]
|
||
|
|
}
|
||
|
|
if hint != 0 && tag != strTag && tag != binaryTag {
|
||
|
|
// Handle things we can lookup in a map.
|
||
|
|
if item, ok := resolveMap[in]; ok {
|
||
|
|
return item.tag, item.value
|
||
|
|
}
|
||
|
|
|
||
|
|
// Base 60 floats are a bad idea, were dropped in YAML 1.2, and
|
||
|
|
// are purposefully unsupported here. They're still quoted on
|
||
|
|
// the way out for compatibility with other parser, though.
|
||
|
|
|
||
|
|
switch hint {
|
||
|
|
case 'M':
|
||
|
|
// We've already checked the map above.
|
||
|
|
|
||
|
|
case '.':
|
||
|
|
// Not in the map, so maybe a normal float.
|
||
|
|
floatv, err := strconv.ParseFloat(in, 64)
|
||
|
|
if err == nil {
|
||
|
|
return floatTag, floatv
|
||
|
|
}
|
||
|
|
|
||
|
|
case 'D', 'S':
|
||
|
|
// Int, float, or timestamp.
|
||
|
|
// Only try values as a timestamp if the value is unquoted or there's an explicit
|
||
|
|
// !!timestamp tag.
|
||
|
|
if tag == "" || tag == timestampTag {
|
||
|
|
t, ok := parseTimestamp(in)
|
||
|
|
if ok {
|
||
|
|
return timestampTag, t
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
plain := strings.Replace(in, "_", "", -1)
|
||
|
|
intv, err := strconv.ParseInt(plain, 0, 64)
|
||
|
|
if err == nil {
|
||
|
|
if intv == int64(int(intv)) {
|
||
|
|
return intTag, int(intv)
|
||
|
|
} else {
|
||
|
|
return intTag, intv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
uintv, err := strconv.ParseUint(plain, 0, 64)
|
||
|
|
if err == nil {
|
||
|
|
return intTag, uintv
|
||
|
|
}
|
||
|
|
if yamlStyleFloat.MatchString(plain) {
|
||
|
|
floatv, err := strconv.ParseFloat(plain, 64)
|
||
|
|
if err == nil {
|
||
|
|
return floatTag, floatv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if strings.HasPrefix(plain, "0b") {
|
||
|
|
intv, err := strconv.ParseInt(plain[2:], 2, 64)
|
||
|
|
if err == nil {
|
||
|
|
if intv == int64(int(intv)) {
|
||
|
|
return intTag, int(intv)
|
||
|
|
} else {
|
||
|
|
return intTag, intv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
uintv, err := strconv.ParseUint(plain[2:], 2, 64)
|
||
|
|
if err == nil {
|
||
|
|
return intTag, uintv
|
||
|
|
}
|
||
|
|
} else if strings.HasPrefix(plain, "-0b") {
|
||
|
|
intv, err := strconv.ParseInt("-"+plain[3:], 2, 64)
|
||
|
|
if err == nil {
|
||
|
|
if true || intv == int64(int(intv)) {
|
||
|
|
return intTag, int(intv)
|
||
|
|
} else {
|
||
|
|
return intTag, intv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// Octals as introduced in version 1.2 of the spec.
|
||
|
|
// Octals from the 1.1 spec, spelled as 0777, are still
|
||
|
|
// decoded by default in v3 as well for compatibility.
|
||
|
|
// May be dropped in v4 depending on how usage evolves.
|
||
|
|
if strings.HasPrefix(plain, "0o") {
|
||
|
|
intv, err := strconv.ParseInt(plain[2:], 8, 64)
|
||
|
|
if err == nil {
|
||
|
|
if intv == int64(int(intv)) {
|
||
|
|
return intTag, int(intv)
|
||
|
|
} else {
|
||
|
|
return intTag, intv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
uintv, err := strconv.ParseUint(plain[2:], 8, 64)
|
||
|
|
if err == nil {
|
||
|
|
return intTag, uintv
|
||
|
|
}
|
||
|
|
} else if strings.HasPrefix(plain, "-0o") {
|
||
|
|
intv, err := strconv.ParseInt("-"+plain[3:], 8, 64)
|
||
|
|
if err == nil {
|
||
|
|
if true || intv == int64(int(intv)) {
|
||
|
|
return intTag, int(intv)
|
||
|
|
} else {
|
||
|
|
return intTag, intv
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
default:
|
||
|
|
panic("internal error: missing handler for resolver table: " + string(rune(hint)) + " (with " + in + ")")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return strTag, in
|
||
|
|
}
|
||
|
|
|
||
|
|
// encodeBase64 encodes s as base64 that is broken up into multiple lines
|
||
|
|
// as appropriate for the resulting length.
|
||
|
|
func encodeBase64(s string) string {
|
||
|
|
const lineLen = 70
|
||
|
|
encLen := base64.StdEncoding.EncodedLen(len(s))
|
||
|
|
lines := encLen/lineLen + 1
|
||
|
|
buf := make([]byte, encLen*2+lines)
|
||
|
|
in := buf[0:encLen]
|
||
|
|
out := buf[encLen:]
|
||
|
|
base64.StdEncoding.Encode(in, []byte(s))
|
||
|
|
k := 0
|
||
|
|
for i := 0; i < len(in); i += lineLen {
|
||
|
|
j := i + lineLen
|
||
|
|
if j > len(in) {
|
||
|
|
j = len(in)
|
||
|
|
}
|
||
|
|
k += copy(out[k:], in[i:j])
|
||
|
|
if lines > 1 {
|
||
|
|
out[k] = '\n'
|
||
|
|
k++
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return string(out[:k])
|
||
|
|
}
|
||
|
|
|
||
|
|
// This is a subset of the formats allowed by the regular expression
|
||
|
|
// defined at http://yaml.org/type/timestamp.html.
|
||
|
|
var allowedTimestampFormats = []string{
|
||
|
|
"2006-1-2T15:4:5.999999999Z07:00", // RCF3339Nano with short date fields.
|
||
|
|
"2006-1-2t15:4:5.999999999Z07:00", // RFC3339Nano with short date fields and lower-case "t".
|
||
|
|
"2006-1-2 15:4:5.999999999", // space separated with no time zone
|
||
|
|
"2006-1-2", // date only
|
||
|
|
// Notable exception: time.Parse cannot handle: "2001-12-14 21:59:43.10 -5"
|
||
|
|
// from the set of examples.
|
||
|
|
}
|
||
|
|
|
||
|
|
// parseTimestamp parses s as a timestamp string and
|
||
|
|
// returns the timestamp and reports whether it succeeded.
|
||
|
|
// Timestamp formats are defined at http://yaml.org/type/timestamp.html
|
||
|
|
func parseTimestamp(s string) (time.Time, bool) {
|
||
|
|
// TODO write code to check all the formats supported by
|
||
|
|
// http://yaml.org/type/timestamp.html instead of using time.Parse.
|
||
|
|
|
||
|
|
// Quick check: all date formats start with YYYY-.
|
||
|
|
i := 0
|
||
|
|
for ; i < len(s); i++ {
|
||
|
|
if c := s[i]; c < '0' || c > '9' {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if i != 4 || i == len(s) || s[i] != '-' {
|
||
|
|
return time.Time{}, false
|
||
|
|
}
|
||
|
|
for _, format := range allowedTimestampFormats {
|
||
|
|
if t, err := time.Parse(format, s); err == nil {
|
||
|
|
return t, true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return time.Time{}, false
|
||
|
|
}
|