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-rw-r--r--vendor/gopkg.in/yaml.v3/resolve.go326
1 files changed, 326 insertions, 0 deletions
diff --git a/vendor/gopkg.in/yaml.v3/resolve.go b/vendor/gopkg.in/yaml.v3/resolve.go
new file mode 100644
index 0000000000..64ae888057
--- /dev/null
+++ b/vendor/gopkg.in/yaml.v3/resolve.go
@@ -0,0 +1,326 @@
+//
+// 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
+}
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