errors: move error variables to errors.go

Author: zchee

errors.go

@@ -0,0 +1,27 @@
+// Copyright 2021 The Go Language Server Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protocol
+
+import "go.lsp.dev/jsonrpc2"
+
+const (
+	// ContentModified is the state change that invalidates the result of a request in execution.
+	//
+	// Defined by the protocol.
+	CodeContentModified jsonrpc2.Code = -32801
+
+	// RequestCancelled is the cancellation error.
+	//
+	// Defined by the protocol.
+	CodeRequestCancelled jsonrpc2.Code = -32800
+)
+
+var (
+	// ErrContentModified should be used when a request is canceled early.
+	ErrContentModified = jsonrpc2.NewError(CodeContentModified, "cancelled JSON-RPC")
+
+	// ErrRequestCancelled should be used when a request is canceled early.
+	ErrRequestCancelled = jsonrpc2.NewError(CodeRequestCancelled, "cancelled JSON-RPC")
+)

handler.go

@@ -12,12 +12,6 @@ import (
 	"go.lsp.dev/pkg/xcontext"
 )
 
-// RequestCancelledCode cancel request code.
-const RequestCancelledCode jsonrpc2.Code = -32800
-
-// ErrRequestCancelled should be used when a request is canceled early.
-var ErrRequestCancelled = jsonrpc2.NewError(RequestCancelledCode, "cancelled JSON-RPC")
-
 // Handlers default jsonrpc2.Handler.
 func Handlers(handler jsonrpc2.Handler) jsonrpc2.Handler {
 	return CancelHandler(