Be more careful about importing encoding/json

1 files changed, 48 insertions, 0 deletions

diff --git a/external.go b/external.go
new file mode 100644
index 0000000..c8a1f68
--- /dev/null
+++ b/external.go
@@ -0,0 +1,48 @@
+// Copyright (C) 2022-2023  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package lowmemjson
+
+import (
+	"encoding"
+	"encoding/json"
+	"reflect"
+)
+
+// A Number represents a JSON number value.  It is represented as a
+// string containing the raw JSON text; it is useful for preserving
+// number values with perfect fidelity, but isn't so useful for use as
+// a number value in a Go program.
+type Number = json.Number
+
+// A RawMessage is a raw encoded JSON value.  This saves time when
+// encoding or decoding, but does mean that the full text must be
+// buffered when decoding.
+type RawMessage = json.RawMessage
+
+type (
+	jsonMarshaler   = json.Marshaler
+	jsonUnmarshaler = json.Unmarshaler
+)
+
+var (
+	// common types.
+	numberType    = reflect.TypeOf(Number(""))
+	byteType      = reflect.TypeOf(byte(0))
+	byteSliceType = reflect.TypeOf(([]byte)(nil))
+
+	// encodable/marshaler types.
+	encodableType     = reflect.TypeOf((*Encodable)(nil)).Elem()
+	jsonMarshalerType = reflect.TypeOf((*json.Marshaler)(nil)).Elem()
+	textMarshalerType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
+
+	// decodable/unmarshaler types.
+	decodableType       = reflect.TypeOf((*Decodable)(nil)).Elem()
+	jsonUnmarshalerType = reflect.TypeOf((*json.Unmarshaler)(nil)).Elem()
+	textUnmarshalerType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
+
+	// other types used by Decoder.
+	rawMessagePtrType = reflect.TypeOf((*json.RawMessage)(nil))
+	float64Type       = reflect.TypeOf(float64(0))
+)