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visitor.go
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visitor.go
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// Copyright 2023 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package migrator
import (
"io"
"github.com/bufbuild/protocompile/ast"
)
func New(cfg Config, fileNode *ast.FileNode, out io.Writer) ast.Visitor {
return &RootVisitor{
printer: NewPrinterVisitor(cfg, fileNode, out),
}
}
type RootVisitor struct {
ast.NoOpVisitor
printer PrinterVisitor
}
func (v *RootVisitor) VisitFileNode(node *ast.FileNode) error {
for _, decl := range node.Decls {
imp, ok := decl.(*ast.ImportNode)
if !ok {
continue
}
v.printer.HasPGV = v.printer.HasPGV || imp.Name.AsString() == v.printer.PGVImport
v.printer.HasPV = v.printer.HasPV || imp.Name.AsString() == v.printer.PVImport
}
switch {
case !v.printer.HasPGV:
// nothing to remove or replace
return v.printer.PrintNodes(true, node)
case v.printer.HasPV && !v.printer.RemovePGV && !v.printer.ReplacePV:
// not removing legacy and not replacing existing
return v.printer.PrintNodes(true, node)
default:
// in all other cases we have work to do
return ast.VisitChildren(node, &FileVisitor{PrinterVisitor: v.printer})
}
}
type element interface {
LeadingWhitespace() string
RawText() string
}
type nodeInfo interface {
element
LeadingComments() ast.Comments
TrailingComments() ast.Comments
}
type wrappedNode interface {
ToNodeInfo() nodeInfo
}
type replacementNode struct {
ast.Node
info replacementNodeInfo
}
func (r replacementNode) ToNodeInfo() nodeInfo {
return r.info
}
type replacementNodeInfo struct {
ast.NodeInfo
Replacement string
}
func (r replacementNodeInfo) RawText() string {
return r.Replacement
}
type unwrappedMessageLiteral struct {
*ast.MessageLiteralNode
}
func (u *unwrappedMessageLiteral) Children() []ast.Node {
allChildren := u.MessageLiteralNode.Children()
return allChildren[1 : len(allChildren)-1]
}