294 lines
8.7 KiB
Go
294 lines
8.7 KiB
Go
package yaml
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"fmt"
|
|
"reflect"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/zclconf/go-cty/cty"
|
|
)
|
|
|
|
type resolveMapItem struct {
|
|
value cty.Value
|
|
tag string
|
|
}
|
|
|
|
var resolveTable = make([]byte, 256)
|
|
var resolveMap = make(map[string]resolveMapItem)
|
|
|
|
// Numeric literal regular expressions from the YAML 1.2 spec:
|
|
//
|
|
// https://yaml.org/spec/1.2/spec.html#id2805071
|
|
var integerLiteralRegexp = regexp.MustCompile(`` +
|
|
// start of string, optional sign, and one of:
|
|
`\A[-+]?(` +
|
|
// octal literal with 0o prefix and optional _ spaces
|
|
`|0o[0-7_]+` +
|
|
// decimal literal and optional _ spaces
|
|
`|[0-9_]+` +
|
|
// hexadecimal literal with 0x prefix and optional _ spaces
|
|
`|0x[0-9a-fA-F_]+` +
|
|
// end of group, and end of string
|
|
`)\z`,
|
|
)
|
|
var floatLiteralRegexp = regexp.MustCompile(
|
|
`\A[-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)?\z`,
|
|
)
|
|
|
|
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 cty.Value
|
|
tag string
|
|
l []string
|
|
}{
|
|
{cty.True, yaml_BOOL_TAG, []string{"y", "Y", "yes", "Yes", "YES"}},
|
|
{cty.True, yaml_BOOL_TAG, []string{"true", "True", "TRUE"}},
|
|
{cty.True, yaml_BOOL_TAG, []string{"on", "On", "ON"}},
|
|
{cty.False, yaml_BOOL_TAG, []string{"n", "N", "no", "No", "NO"}},
|
|
{cty.False, yaml_BOOL_TAG, []string{"false", "False", "FALSE"}},
|
|
{cty.False, yaml_BOOL_TAG, []string{"off", "Off", "OFF"}},
|
|
{cty.NullVal(cty.DynamicPseudoType), yaml_NULL_TAG, []string{"", "~", "null", "Null", "NULL"}},
|
|
{cty.PositiveInfinity, yaml_FLOAT_TAG, []string{".inf", ".Inf", ".INF"}},
|
|
{cty.PositiveInfinity, yaml_FLOAT_TAG, []string{"+.inf", "+.Inf", "+.INF"}},
|
|
{cty.NegativeInfinity, yaml_FLOAT_TAG, []string{"-.inf", "-.Inf", "-.INF"}},
|
|
}
|
|
|
|
m := resolveMap
|
|
for _, item := range resolveMapList {
|
|
for _, s := range item.l {
|
|
m[s] = resolveMapItem{item.v, item.tag}
|
|
}
|
|
}
|
|
}
|
|
|
|
const longTagPrefix = "tag:yaml.org,2002:"
|
|
|
|
func shortTag(tag string) string {
|
|
// TODO This can easily be made faster and produce less garbage.
|
|
if strings.HasPrefix(tag, longTagPrefix) {
|
|
return "!!" + tag[len(longTagPrefix):]
|
|
}
|
|
return tag
|
|
}
|
|
|
|
func longTag(tag string) string {
|
|
if strings.HasPrefix(tag, "!!") {
|
|
return longTagPrefix + tag[2:]
|
|
}
|
|
return tag
|
|
}
|
|
|
|
func resolvableTag(tag string) bool {
|
|
switch tag {
|
|
case "", yaml_STR_TAG, yaml_BOOL_TAG, yaml_INT_TAG, yaml_FLOAT_TAG, yaml_NULL_TAG, yaml_TIMESTAMP_TAG, yaml_BINARY_TAG:
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
var yamlStyleFloat = regexp.MustCompile(`^[-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)?$`)
|
|
|
|
func (c *Converter) resolveScalar(tag string, src string, style yaml_scalar_style_t) (cty.Value, error) {
|
|
if !resolvableTag(tag) {
|
|
return cty.NilVal, fmt.Errorf("unsupported tag %q", 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 src != "" {
|
|
hint = resolveTable[src[0]]
|
|
}
|
|
if hint != 0 && tag != yaml_STR_TAG && tag != yaml_BINARY_TAG {
|
|
if style == yaml_SINGLE_QUOTED_SCALAR_STYLE || style == yaml_DOUBLE_QUOTED_SCALAR_STYLE {
|
|
return cty.StringVal(src), nil
|
|
}
|
|
|
|
// Handle things we can lookup in a map.
|
|
if item, ok := resolveMap[src]; ok {
|
|
return item.value, nil
|
|
}
|
|
|
|
if tag == "" {
|
|
for _, nan := range []string{".nan", ".NaN", ".NAN"} {
|
|
if src == nan {
|
|
// cty cannot represent NaN, so this is an error
|
|
return cty.NilVal, fmt.Errorf("floating point NaN is not supported")
|
|
}
|
|
}
|
|
}
|
|
|
|
// Base 60 floats are intentionally not supported.
|
|
|
|
switch hint {
|
|
case 'M':
|
|
// We've already checked the map above.
|
|
|
|
case '.':
|
|
// Not in the map, so maybe a normal float.
|
|
if numberVal, err := cty.ParseNumberVal(src); err == nil {
|
|
return numberVal, nil
|
|
}
|
|
|
|
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 == yaml_TIMESTAMP_TAG {
|
|
t, ok := parseTimestamp(src)
|
|
if ok {
|
|
// cty has no timestamp type, but its functions stdlib
|
|
// conventionally uses strings in an RFC3339 encoding
|
|
// to represent time, so we'll follow that convention here.
|
|
return cty.StringVal(t.Format(time.RFC3339)), nil
|
|
}
|
|
}
|
|
|
|
if integerLiteralRegexp.MatchString(src) {
|
|
tag = yaml_INT_TAG // will handle parsing below in our tag switch
|
|
break
|
|
}
|
|
if floatLiteralRegexp.MatchString(src) {
|
|
tag = yaml_FLOAT_TAG // will handle parsing below in our tag switch
|
|
break
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("cannot resolve tag %q with source %q", tag, src))
|
|
}
|
|
}
|
|
|
|
if tag == "" && src == "<<" {
|
|
return mergeMappingVal, nil
|
|
}
|
|
|
|
switch tag {
|
|
case yaml_STR_TAG, yaml_BINARY_TAG:
|
|
// If it's binary then we want to keep the base64 representation, because
|
|
// cty has no binary type, but we will check that it's actually base64.
|
|
if tag == yaml_BINARY_TAG {
|
|
_, err := base64.StdEncoding.DecodeString(src)
|
|
if err != nil {
|
|
return cty.NilVal, fmt.Errorf("cannot parse %q as %s: not valid base64", src, tag)
|
|
}
|
|
}
|
|
return cty.StringVal(src), nil
|
|
case yaml_BOOL_TAG:
|
|
item, ok := resolveMap[src]
|
|
if !ok || item.tag != yaml_BOOL_TAG {
|
|
return cty.NilVal, fmt.Errorf("cannot parse %q as %s", src, tag)
|
|
}
|
|
return item.value, nil
|
|
case yaml_FLOAT_TAG, yaml_INT_TAG:
|
|
// Note: We don't actually check that a value tagged INT is a whole
|
|
// number here. We could, but cty generally doesn't care about the
|
|
// int/float distinction, so we'll just be generous and accept it.
|
|
plain := strings.Replace(src, "_", "", -1)
|
|
if numberVal, err := cty.ParseNumberVal(plain); err == nil { // handles decimal integers and floats
|
|
return numberVal, nil
|
|
}
|
|
if intv, err := strconv.ParseInt(plain, 0, 64); err == nil { // handles 0x and 00 prefixes
|
|
return cty.NumberIntVal(intv), nil
|
|
}
|
|
if uintv, err := strconv.ParseUint(plain, 0, 64); err == nil { // handles 0x and 00 prefixes
|
|
return cty.NumberUIntVal(uintv), nil
|
|
}
|
|
return cty.NilVal, fmt.Errorf("cannot parse %q as %s", src, tag)
|
|
case yaml_TIMESTAMP_TAG:
|
|
t, ok := parseTimestamp(src)
|
|
if ok {
|
|
// cty has no timestamp type, but its functions stdlib
|
|
// conventionally uses strings in an RFC3339 encoding
|
|
// to represent time, so we'll follow that convention here.
|
|
return cty.StringVal(t.Format(time.RFC3339)), nil
|
|
}
|
|
return cty.NilVal, fmt.Errorf("cannot parse %q as %s", src, tag)
|
|
case yaml_NULL_TAG:
|
|
return cty.NullVal(cty.DynamicPseudoType), nil
|
|
case "":
|
|
return cty.StringVal(src), nil
|
|
default:
|
|
return cty.NilVal, fmt.Errorf("unsupported tag %q", tag)
|
|
}
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
type mergeMapping struct{}
|
|
|
|
var mergeMappingTy = cty.Capsule("merge mapping", reflect.TypeOf(mergeMapping{}))
|
|
var mergeMappingVal = cty.CapsuleVal(mergeMappingTy, &mergeMapping{})
|