add vendor

vendor/github.com/zclconf/go-cty/cty/json/doc.go

@@ -0,0 +1,11 @@
+// Package json provides functions for serializing cty types and values in
+// JSON format, and for decoding them again.
+//
+// Since the cty type system is a superset of the JSON type system,
+// round-tripping through JSON is lossy unless type information is provided
+// both at encoding time and decoding time. Callers of this package are
+// therefore suggested to define their expected structure as a cty.Type
+// and pass it in consistently both when encoding and when decoding, though
+// default (type-lossy) behavior is provided for situations where the precise
+// representation of the data is not significant.
+package json

vendor/github.com/zclconf/go-cty/cty/json/marshal.go

@@ -0,0 +1,193 @@
+package json
+
+import (
+	"bytes"
+	"encoding/json"
+	"sort"
+
+	"github.com/zclconf/go-cty/cty"
+)
+
+func marshal(val cty.Value, t cty.Type, path cty.Path, b *bytes.Buffer) error {
+	if val.IsMarked() {
+		return path.NewErrorf("value has marks, so it cannot be serialized as JSON")
+	}
+
+	// If we're going to decode as DynamicPseudoType then we need to save
+	// dynamic type information to recover the real type.
+	if t == cty.DynamicPseudoType && val.Type() != cty.DynamicPseudoType {
+		return marshalDynamic(val, path, b)
+	}
+
+	if val.IsNull() {
+		b.WriteString("null")
+		return nil
+	}
+
+	if !val.IsKnown() {
+		return path.NewErrorf("value is not known")
+	}
+
+	// The caller should've guaranteed that the given val is conformant with
+	// the given type t, so we'll proceed under that assumption here.
+
+	switch {
+	case t.IsPrimitiveType():
+		switch t {
+		case cty.String:
+			json, err := json.Marshal(val.AsString())
+			if err != nil {
+				return path.NewErrorf("failed to serialize value: %s", err)
+			}
+			b.Write(json)
+			return nil
+		case cty.Number:
+			if val.RawEquals(cty.PositiveInfinity) || val.RawEquals(cty.NegativeInfinity) {
+				return path.NewErrorf("cannot serialize infinity as JSON")
+			}
+			b.WriteString(val.AsBigFloat().Text('f', -1))
+			return nil
+		case cty.Bool:
+			if val.True() {
+				b.WriteString("true")
+			} else {
+				b.WriteString("false")
+			}
+			return nil
+		default:
+			panic("unsupported primitive type")
+		}
+	case t.IsListType(), t.IsSetType():
+		b.WriteRune('[')
+		first := true
+		ety := t.ElementType()
+		it := val.ElementIterator()
+		path := append(path, nil) // local override of 'path' with extra element
+		for it.Next() {
+			if !first {
+				b.WriteRune(',')
+			}
+			ek, ev := it.Element()
+			path[len(path)-1] = cty.IndexStep{
+				Key: ek,
+			}
+			err := marshal(ev, ety, path, b)
+			if err != nil {
+				return err
+			}
+			first = false
+		}
+		b.WriteRune(']')
+		return nil
+	case t.IsMapType():
+		b.WriteRune('{')
+		first := true
+		ety := t.ElementType()
+		it := val.ElementIterator()
+		path := append(path, nil) // local override of 'path' with extra element
+		for it.Next() {
+			if !first {
+				b.WriteRune(',')
+			}
+			ek, ev := it.Element()
+			path[len(path)-1] = cty.IndexStep{
+				Key: ek,
+			}
+			var err error
+			err = marshal(ek, ek.Type(), path, b)
+			if err != nil {
+				return err
+			}
+			b.WriteRune(':')
+			err = marshal(ev, ety, path, b)
+			if err != nil {
+				return err
+			}
+			first = false
+		}
+		b.WriteRune('}')
+		return nil
+	case t.IsTupleType():
+		b.WriteRune('[')
+		etys := t.TupleElementTypes()
+		it := val.ElementIterator()
+		path := append(path, nil) // local override of 'path' with extra element
+		i := 0
+		for it.Next() {
+			if i > 0 {
+				b.WriteRune(',')
+			}
+			ety := etys[i]
+			ek, ev := it.Element()
+			path[len(path)-1] = cty.IndexStep{
+				Key: ek,
+			}
+			err := marshal(ev, ety, path, b)
+			if err != nil {
+				return err
+			}
+			i++
+		}
+		b.WriteRune(']')
+		return nil
+	case t.IsObjectType():
+		b.WriteRune('{')
+		atys := t.AttributeTypes()
+		path := append(path, nil) // local override of 'path' with extra element
+
+		names := make([]string, 0, len(atys))
+		for k := range atys {
+			names = append(names, k)
+		}
+		sort.Strings(names)
+
+		for i, k := range names {
+			aty := atys[k]
+			if i > 0 {
+				b.WriteRune(',')
+			}
+			av := val.GetAttr(k)
+			path[len(path)-1] = cty.GetAttrStep{
+				Name: k,
+			}
+			var err error
+			err = marshal(cty.StringVal(k), cty.String, path, b)
+			if err != nil {
+				return err
+			}
+			b.WriteRune(':')
+			err = marshal(av, aty, path, b)
+			if err != nil {
+				return err
+			}
+		}
+		b.WriteRune('}')
+		return nil
+	case t.IsCapsuleType():
+		rawVal := val.EncapsulatedValue()
+		jsonVal, err := json.Marshal(rawVal)
+		if err != nil {
+			return path.NewError(err)
+		}
+		b.Write(jsonVal)
+		return nil
+	default:
+		// should never happen
+		return path.NewErrorf("cannot JSON-serialize %s", t.FriendlyName())
+	}
+}
+
+// marshalDynamic adds an extra wrapping object containing dynamic type
+// information for the given value.
+func marshalDynamic(val cty.Value, path cty.Path, b *bytes.Buffer) error {
+	typeJSON, err := MarshalType(val.Type())
+	if err != nil {
+		return path.NewErrorf("failed to serialize type: %s", err)
+	}
+	b.WriteString(`{"value":`)
+	marshal(val, val.Type(), path, b)
+	b.WriteString(`,"type":`)
+	b.Write(typeJSON)
+	b.WriteRune('}')
+	return nil
+}

vendor/github.com/zclconf/go-cty/cty/json/simple.go

@@ -0,0 +1,41 @@
+package json
+
+import (
+	"github.com/zclconf/go-cty/cty"
+)
+
+// SimpleJSONValue is a wrapper around cty.Value that adds implementations of
+// json.Marshaler and json.Unmarshaler for simple-but-type-lossy automatic
+// encoding and decoding of values.
+//
+// The couplet Marshal and Unmarshal both take extra type information to
+// inform the encoding and decoding process so that all of the cty types
+// can be represented even though JSON's type system is a subset.
+//
+// SimpleJSONValue instead takes the approach of discarding the value's type
+// information and then deriving a new type from the stored structure when
+// decoding. This results in the same data being returned but not necessarily
+// with exactly the same type.
+//
+// For information on how types are inferred when decoding, see the
+// documentation of the function ImpliedType.
+type SimpleJSONValue struct {
+	cty.Value
+}
+
+// MarshalJSON is an implementation of json.Marshaler. See the documentation
+// of SimpleJSONValue for more information.
+func (v SimpleJSONValue) MarshalJSON() ([]byte, error) {
+	return Marshal(v.Value, v.Type())
+}
+
+// UnmarshalJSON is an implementation of json.Unmarshaler. See the
+// documentation of SimpleJSONValue for more information.
+func (v *SimpleJSONValue) UnmarshalJSON(buf []byte) error {
+	t, err := ImpliedType(buf)
+	if err != nil {
+		return err
+	}
+	v.Value, err = Unmarshal(buf, t)
+	return err
+}

vendor/github.com/zclconf/go-cty/cty/json/type.go

@@ -0,0 +1,23 @@
+package json
+
+import (
+	"github.com/zclconf/go-cty/cty"
+)
+
+// MarshalType returns a JSON serialization of the given type.
+//
+// This is just a thin wrapper around t.MarshalJSON, for symmetry with
+// UnmarshalType.
+func MarshalType(t cty.Type) ([]byte, error) {
+	return t.MarshalJSON()
+}
+
+// UnmarshalType decodes a JSON serialization of the given type as produced
+// by either Type.MarshalJSON or MarshalType.
+//
+// This is a convenience wrapper around Type.UnmarshalJSON.
+func UnmarshalType(buf []byte) (cty.Type, error) {
+	var t cty.Type
+	err := t.UnmarshalJSON(buf)
+	return t, err
+}

vendor/github.com/zclconf/go-cty/cty/json/type_implied.go

@@ -0,0 +1,170 @@
+package json
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+
+	"github.com/zclconf/go-cty/cty"
+)
+
+// ImpliedType returns the cty Type implied by the structure of the given
+// JSON-compliant buffer. This function implements the default type mapping
+// behavior used when decoding arbitrary JSON without explicit cty Type
+// information.
+//
+// The rules are as follows:
+//
+// JSON strings, numbers and bools map to their equivalent primitive type in
+// cty.
+//
+// JSON objects map to cty object types, with the attributes defined by the
+// object keys and the types of their values.
+//
+// JSON arrays map to cty tuple types, with the elements defined by the
+// types of the array members.
+//
+// Any nulls are typed as DynamicPseudoType, so callers of this function
+// must be prepared to deal with this. Callers that do not wish to deal with
+// dynamic typing should not use this function and should instead describe
+// their required types explicitly with a cty.Type instance when decoding.
+//
+// Any JSON syntax errors will be returned as an error, and the type will
+// be the invalid value cty.NilType.
+func ImpliedType(buf []byte) (cty.Type, error) {
+	r := bytes.NewReader(buf)
+	dec := json.NewDecoder(r)
+	dec.UseNumber()
+
+	ty, err := impliedType(dec)
+	if err != nil {
+		return cty.NilType, err
+	}
+
+	if dec.More() {
+		return cty.NilType, fmt.Errorf("extraneous data after JSON object")
+	}
+
+	return ty, nil
+}
+
+func impliedType(dec *json.Decoder) (cty.Type, error) {
+	tok, err := dec.Token()
+	if err != nil {
+		return cty.NilType, err
+	}
+
+	return impliedTypeForTok(tok, dec)
+}
+
+func impliedTypeForTok(tok json.Token, dec *json.Decoder) (cty.Type, error) {
+	if tok == nil {
+		return cty.DynamicPseudoType, nil
+	}
+
+	switch ttok := tok.(type) {
+	case bool:
+		return cty.Bool, nil
+
+	case json.Number:
+		return cty.Number, nil
+
+	case string:
+		return cty.String, nil
+
+	case json.Delim:
+
+		switch rune(ttok) {
+		case '{':
+			return impliedObjectType(dec)
+		case '[':
+			return impliedTupleType(dec)
+		default:
+			return cty.NilType, fmt.Errorf("unexpected token %q", ttok)
+		}
+
+	default:
+		return cty.NilType, fmt.Errorf("unsupported JSON token %#v", tok)
+	}
+}
+
+func impliedObjectType(dec *json.Decoder) (cty.Type, error) {
+	// By the time we get in here, we've already consumed the { delimiter
+	// and so our next token should be the first object key.
+
+	var atys map[string]cty.Type
+
+	for {
+		// Read the object key first
+		tok, err := dec.Token()
+		if err != nil {
+			return cty.NilType, err
+		}
+
+		if ttok, ok := tok.(json.Delim); ok {
+			if rune(ttok) != '}' {
+				return cty.NilType, fmt.Errorf("unexpected delimiter %q", ttok)
+			}
+			break
+		}
+
+		key, ok := tok.(string)
+		if !ok {
+			return cty.NilType, fmt.Errorf("expected string but found %T", tok)
+		}
+
+		// Now read the value
+		tok, err = dec.Token()
+		if err != nil {
+			return cty.NilType, err
+		}
+
+		aty, err := impliedTypeForTok(tok, dec)
+		if err != nil {
+			return cty.NilType, err
+		}
+
+		if atys == nil {
+			atys = make(map[string]cty.Type)
+		}
+		atys[key] = aty
+	}
+
+	if len(atys) == 0 {
+		return cty.EmptyObject, nil
+	}
+
+	return cty.Object(atys), nil
+}
+
+func impliedTupleType(dec *json.Decoder) (cty.Type, error) {
+	// By the time we get in here, we've already consumed the [ delimiter
+	// and so our next token should be the first value.
+
+	var etys []cty.Type
+
+	for {
+		tok, err := dec.Token()
+		if err != nil {
+			return cty.NilType, err
+		}
+
+		if ttok, ok := tok.(json.Delim); ok {
+			if rune(ttok) == ']' {
+				break
+			}
+		}
+
+		ety, err := impliedTypeForTok(tok, dec)
+		if err != nil {
+			return cty.NilType, err
+		}
+		etys = append(etys, ety)
+	}
+
+	if len(etys) == 0 {
+		return cty.EmptyTuple, nil
+	}
+
+	return cty.Tuple(etys), nil
+}

vendor/github.com/zclconf/go-cty/cty/json/unmarshal.go

@@ -0,0 +1,459 @@
+package json
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"reflect"
+
+	"github.com/zclconf/go-cty/cty"
+	"github.com/zclconf/go-cty/cty/convert"
+)
+
+func unmarshal(buf []byte, t cty.Type, path cty.Path) (cty.Value, error) {
+	dec := bufDecoder(buf)
+
+	tok, err := dec.Token()
+	if err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	if tok == nil {
+		return cty.NullVal(t), nil
+	}
+
+	if t == cty.DynamicPseudoType {
+		return unmarshalDynamic(buf, path)
+	}
+
+	switch {
+	case t.IsPrimitiveType():
+		val, err := unmarshalPrimitive(tok, t, path)
+		if err != nil {
+			return cty.NilVal, err
+		}
+		return val, nil
+	case t.IsListType():
+		return unmarshalList(buf, t.ElementType(), path)
+	case t.IsSetType():
+		return unmarshalSet(buf, t.ElementType(), path)
+	case t.IsMapType():
+		return unmarshalMap(buf, t.ElementType(), path)
+	case t.IsTupleType():
+		return unmarshalTuple(buf, t.TupleElementTypes(), path)
+	case t.IsObjectType():
+		return unmarshalObject(buf, t.AttributeTypes(), path)
+	case t.IsCapsuleType():
+		return unmarshalCapsule(buf, t, path)
+	default:
+		return cty.NilVal, path.NewErrorf("unsupported type %s", t.FriendlyName())
+	}
+}
+
+func unmarshalPrimitive(tok json.Token, t cty.Type, path cty.Path) (cty.Value, error) {
+
+	switch t {
+	case cty.Bool:
+		switch v := tok.(type) {
+		case bool:
+			return cty.BoolVal(v), nil
+		case string:
+			val, err := convert.Convert(cty.StringVal(v), t)
+			if err != nil {
+				return cty.NilVal, path.NewError(err)
+			}
+			return val, nil
+		default:
+			return cty.NilVal, path.NewErrorf("bool is required")
+		}
+	case cty.Number:
+		if v, ok := tok.(json.Number); ok {
+			tok = string(v)
+		}
+		switch v := tok.(type) {
+		case string:
+			val, err := cty.ParseNumberVal(v)
+			if err != nil {
+				return cty.NilVal, path.NewError(err)
+			}
+			return val, nil
+		default:
+			return cty.NilVal, path.NewErrorf("number is required")
+		}
+	case cty.String:
+		switch v := tok.(type) {
+		case string:
+			return cty.StringVal(v), nil
+		case json.Number:
+			return cty.StringVal(string(v)), nil
+		case bool:
+			val, err := convert.Convert(cty.BoolVal(v), t)
+			if err != nil {
+				return cty.NilVal, path.NewError(err)
+			}
+			return val, nil
+		default:
+			return cty.NilVal, path.NewErrorf("string is required")
+		}
+	default:
+		// should never happen
+		panic("unsupported primitive type")
+	}
+}
+
+func unmarshalList(buf []byte, ety cty.Type, path cty.Path) (cty.Value, error) {
+	dec := bufDecoder(buf)
+	if err := requireDelim(dec, '['); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	var vals []cty.Value
+
+	{
+		path := append(path, nil)
+		var idx int64
+
+		for dec.More() {
+			path[len(path)-1] = cty.IndexStep{
+				Key: cty.NumberIntVal(idx),
+			}
+			idx++
+
+			rawVal, err := readRawValue(dec)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to read list value: %s", err)
+			}
+
+			el, err := unmarshal(rawVal, ety, path)
+			if err != nil {
+				return cty.NilVal, err
+			}
+
+			vals = append(vals, el)
+		}
+	}
+
+	if err := requireDelim(dec, ']'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	if len(vals) == 0 {
+		return cty.ListValEmpty(ety), nil
+	}
+
+	return cty.ListVal(vals), nil
+}
+
+func unmarshalSet(buf []byte, ety cty.Type, path cty.Path) (cty.Value, error) {
+	dec := bufDecoder(buf)
+	if err := requireDelim(dec, '['); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	var vals []cty.Value
+
+	{
+		path := append(path, nil)
+
+		for dec.More() {
+			path[len(path)-1] = cty.IndexStep{
+				Key: cty.UnknownVal(ety),
+			}
+
+			rawVal, err := readRawValue(dec)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to read set value: %s", err)
+			}
+
+			el, err := unmarshal(rawVal, ety, path)
+			if err != nil {
+				return cty.NilVal, err
+			}
+
+			vals = append(vals, el)
+		}
+	}
+
+	if err := requireDelim(dec, ']'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	if len(vals) == 0 {
+		return cty.SetValEmpty(ety), nil
+	}
+
+	return cty.SetVal(vals), nil
+}
+
+func unmarshalMap(buf []byte, ety cty.Type, path cty.Path) (cty.Value, error) {
+	dec := bufDecoder(buf)
+	if err := requireDelim(dec, '{'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	vals := make(map[string]cty.Value)
+
+	{
+		path := append(path, nil)
+
+		for dec.More() {
+			path[len(path)-1] = cty.IndexStep{
+				Key: cty.UnknownVal(cty.String),
+			}
+
+			var err error
+
+			k, err := requireObjectKey(dec)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to read map key: %s", err)
+			}
+
+			path[len(path)-1] = cty.IndexStep{
+				Key: cty.StringVal(k),
+			}
+
+			rawVal, err := readRawValue(dec)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to read map value: %s", err)
+			}
+
+			el, err := unmarshal(rawVal, ety, path)
+			if err != nil {
+				return cty.NilVal, err
+			}
+
+			vals[k] = el
+		}
+	}
+
+	if err := requireDelim(dec, '}'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	if len(vals) == 0 {
+		return cty.MapValEmpty(ety), nil
+	}
+
+	return cty.MapVal(vals), nil
+}
+
+func unmarshalTuple(buf []byte, etys []cty.Type, path cty.Path) (cty.Value, error) {
+	dec := bufDecoder(buf)
+	if err := requireDelim(dec, '['); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	var vals []cty.Value
+
+	{
+		path := append(path, nil)
+		var idx int
+
+		for dec.More() {
+			if idx >= len(etys) {
+				return cty.NilVal, path[:len(path)-1].NewErrorf("too many tuple elements (need %d)", len(etys))
+			}
+
+			path[len(path)-1] = cty.IndexStep{
+				Key: cty.NumberIntVal(int64(idx)),
+			}
+			ety := etys[idx]
+			idx++
+
+			rawVal, err := readRawValue(dec)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to read tuple value: %s", err)
+			}
+
+			el, err := unmarshal(rawVal, ety, path)
+			if err != nil {
+				return cty.NilVal, err
+			}
+
+			vals = append(vals, el)
+		}
+	}
+
+	if err := requireDelim(dec, ']'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	if len(vals) != len(etys) {
+		return cty.NilVal, path[:len(path)-1].NewErrorf("not enough tuple elements (need %d)", len(etys))
+	}
+
+	if len(vals) == 0 {
+		return cty.EmptyTupleVal, nil
+	}
+
+	return cty.TupleVal(vals), nil
+}
+
+func unmarshalObject(buf []byte, atys map[string]cty.Type, path cty.Path) (cty.Value, error) {
+	dec := bufDecoder(buf)
+	if err := requireDelim(dec, '{'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	vals := make(map[string]cty.Value)
+
+	{
+		objPath := path           // some errors report from the object's perspective
+		path := append(path, nil) // path to a specific attribute
+
+		for dec.More() {
+
+			var err error
+
+			k, err := requireObjectKey(dec)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to read object key: %s", err)
+			}
+
+			aty, ok := atys[k]
+			if !ok {
+				return cty.NilVal, objPath.NewErrorf("unsupported attribute %q", k)
+			}
+
+			path[len(path)-1] = cty.GetAttrStep{
+				Name: k,
+			}
+
+			rawVal, err := readRawValue(dec)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to read object value: %s", err)
+			}
+
+			el, err := unmarshal(rawVal, aty, path)
+			if err != nil {
+				return cty.NilVal, err
+			}
+
+			vals[k] = el
+		}
+	}
+
+	if err := requireDelim(dec, '}'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	// Make sure we have a value for every attribute
+	for k, aty := range atys {
+		if _, exists := vals[k]; !exists {
+			vals[k] = cty.NullVal(aty)
+		}
+	}
+
+	if len(vals) == 0 {
+		return cty.EmptyObjectVal, nil
+	}
+
+	return cty.ObjectVal(vals), nil
+}
+
+func unmarshalCapsule(buf []byte, t cty.Type, path cty.Path) (cty.Value, error) {
+	rawType := t.EncapsulatedType()
+	ptrPtr := reflect.New(reflect.PtrTo(rawType))
+	ptrPtr.Elem().Set(reflect.New(rawType))
+	ptr := ptrPtr.Elem().Interface()
+	err := json.Unmarshal(buf, ptr)
+	if err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	return cty.CapsuleVal(t, ptr), nil
+}
+
+func unmarshalDynamic(buf []byte, path cty.Path) (cty.Value, error) {
+	dec := bufDecoder(buf)
+	if err := requireDelim(dec, '{'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	var t cty.Type
+	var valBody []byte // defer actual decoding until we know the type
+
+	for dec.More() {
+		var err error
+
+		key, err := requireObjectKey(dec)
+		if err != nil {
+			return cty.NilVal, path.NewErrorf("failed to read dynamic type descriptor key: %s", err)
+		}
+
+		rawVal, err := readRawValue(dec)
+		if err != nil {
+			return cty.NilVal, path.NewErrorf("failed to read dynamic type descriptor value: %s", err)
+		}
+
+		switch key {
+		case "type":
+			err := json.Unmarshal(rawVal, &t)
+			if err != nil {
+				return cty.NilVal, path.NewErrorf("failed to decode type for dynamic value: %s", err)
+			}
+		case "value":
+			valBody = rawVal
+		default:
+			return cty.NilVal, path.NewErrorf("invalid key %q in dynamically-typed value", key)
+		}
+
+	}
+
+	if err := requireDelim(dec, '}'); err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+
+	if t == cty.NilType {
+		return cty.NilVal, path.NewErrorf("missing type in dynamically-typed value")
+	}
+	if valBody == nil {
+		return cty.NilVal, path.NewErrorf("missing value in dynamically-typed value")
+	}
+
+	val, err := Unmarshal([]byte(valBody), t)
+	if err != nil {
+		return cty.NilVal, path.NewError(err)
+	}
+	return val, nil
+}
+
+func requireDelim(dec *json.Decoder, d rune) error {
+	tok, err := dec.Token()
+	if err != nil {
+		return err
+	}
+
+	if tok != json.Delim(d) {
+		return fmt.Errorf("missing expected %c", d)
+	}
+
+	return nil
+}
+
+func requireObjectKey(dec *json.Decoder) (string, error) {
+	tok, err := dec.Token()
+	if err != nil {
+		return "", err
+	}
+	if s, ok := tok.(string); ok {
+		return s, nil
+	}
+	return "", fmt.Errorf("missing expected object key")
+}
+
+func readRawValue(dec *json.Decoder) ([]byte, error) {
+	var rawVal json.RawMessage
+	err := dec.Decode(&rawVal)
+	if err != nil {
+		return nil, err
+	}
+	return []byte(rawVal), nil
+}
+
+func bufDecoder(buf []byte) *json.Decoder {
+	r := bytes.NewReader(buf)
+	dec := json.NewDecoder(r)
+	dec.UseNumber()
+	return dec
+}

vendor/github.com/zclconf/go-cty/cty/json/value.go

@@ -0,0 +1,65 @@
+package json
+
+import (
+	"bytes"
+
+	"github.com/zclconf/go-cty/cty"
+	"github.com/zclconf/go-cty/cty/convert"
+)
+
+// Marshal produces a JSON representation of the given value that can later
+// be decoded into a value of the given type.
+//
+// A type is specified separately to allow for the given type to include
+// cty.DynamicPseudoType to represent situations where any type is permitted
+// and so type information must be included to allow recovery of the stored
+// structure when decoding.
+//
+// The given type will also be used to attempt automatic conversions of any
+// non-conformant types in the given value, although this will not always
+// be possible. If the value cannot be made to be conformant then an error is
+// returned, which may be a cty.PathError.
+//
+// Capsule-typed values can be marshalled, but with some caveats. Since
+// capsule values are compared by pointer equality, it is impossible to recover
+// a value that will compare equal to the original value. Additionally,
+// it's not possible to JSON-serialize the capsule type itself, so it's not
+// valid to use capsule types within parts of the value that are conformed to
+// cty.DynamicPseudoType. Otherwise, a capsule value can be used as long as
+// the encapsulated type itself is serializable with the Marshal function
+// in encoding/json.
+func Marshal(val cty.Value, t cty.Type) ([]byte, error) {
+	errs := val.Type().TestConformance(t)
+	if errs != nil {
+		// Attempt a conversion
+		var err error
+		val, err = convert.Convert(val, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// From this point onward, val can be assumed to be conforming to t.
+
+	buf := &bytes.Buffer{}
+	var path cty.Path
+	err := marshal(val, t, path, buf)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+// Unmarshal decodes a JSON representation of the given value into a cty Value
+// conforming to the given type.
+//
+// While decoding, type conversions will be done where possible to make
+// the result conformant even if the types given in JSON are not exactly
+// correct. If conversion isn't possible then an error is returned, which
+// may be a cty.PathError.
+func Unmarshal(buf []byte, t cty.Type) (cty.Value, error) {
+	var path cty.Path
+	return unmarshal(buf, t, path)
+}