vendor tsgo

tools/tsgo/internal/packagejson/expected.go

@@ -0,0 +1,75 @@
+package packagejson
+
+import (
+	"reflect"
+
+	"github.com/microsoft/typescript-go/internal/json"
+)
+
+type Expected[T any] struct {
+	actualJSONType string
+	Null           bool
+	Valid          bool
+	Value          T
+}
+
+func (e *Expected[T]) UnmarshalJSON(data []byte) error {
+	if string(data) == "null" {
+		*e = Expected[T]{Null: true, actualJSONType: "null"}
+		return nil
+	}
+	if json.Unmarshal(data, &e.Value) == nil {
+		e.Valid = true
+	}
+	switch data[0] {
+	case '"':
+		e.actualJSONType = "string"
+	case 't', 'f':
+		e.actualJSONType = "boolean"
+	case '[':
+		e.actualJSONType = "array"
+	case '{':
+		e.actualJSONType = "object"
+	default:
+		e.actualJSONType = "number"
+	}
+	return nil
+}
+
+func (e *Expected[T]) IsPresent() bool {
+	return e.actualJSONType != ""
+}
+
+func (e *Expected[T]) GetValue() (value T, ok bool) {
+	return e.Value, e.Valid
+}
+
+func (e *Expected[T]) IsValid() bool {
+	return e.Valid
+}
+
+func (e *Expected[T]) ExpectedJSONType() string {
+	switch reflect.TypeFor[T]().Kind() {
+	case reflect.String:
+		return "string"
+	case reflect.Bool:
+		return "boolean"
+	case reflect.Slice, reflect.Array:
+		return "array"
+	case reflect.Map:
+		return "object"
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return "number"
+	default:
+		return "unknown"
+	}
+}
+
+func (e *Expected[T]) ActualJSONType() string {
+	return e.actualJSONType
+}
+
+func ExpectedOf[T any](value T) Expected[T] {
+	return Expected[T]{Value: value, Valid: true, actualJSONType: (*Expected[T])(nil).ExpectedJSONType()}
+}