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 0000000..64ae888
--- /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
+}