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// Extensions for Protocol Buffers to create more go like structures.
//
// Copyright (c) 2013, Vastech SA (PTY) LTD. All rights reserved.
// http://code.google.com/p/gogoprotobuf/gogoproto
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package fieldpath
import (
"code.google.com/p/gogoprotobuf/gogoproto"
descriptor "code.google.com/p/gogoprotobuf/protoc-gen-gogo/descriptor"
"fmt"
"strings"
)
type errUndefined struct {
rootPkg string
rootMsg string
path string
}
func (this *errUndefined) Error() string {
return fmt.Sprintf("undefined field %s.%s.%s", this.rootPkg, this.rootMsg, this.path)
}
//Expands a fieldpath as defined in go with possible implications for embedded structs to a normal proto fieldpath.
func Expand(rootPkg string, rootMsg string, path string, descriptorSet *descriptor.FileDescriptorSet) (string, error) {
msg := descriptorSet.GetMessage(rootPkg, rootMsg)
if msg == nil {
return "", &errUndefined{rootPkg, rootMsg, path}
}
paths := strings.Split(path, ".")
if len(paths) == 0 {
return "", &errUndefined{rootPkg, rootMsg, path}
}
for _, f := range msg.GetField() {
if f.IsMessage() {
newRootPkg, newRootMsg := descriptorSet.FindMessage(rootPkg, rootMsg, f.GetName())
if len(newRootPkg) == 0 || len(newRootMsg) == 0 {
return "", &errUndefined{rootPkg, rootMsg, path}
}
if gogoproto.IsEmbed(f) {
newPath, err := Expand(newRootPkg, newRootMsg, strings.Join(paths, "."), descriptorSet)
if err == nil {
return f.GetName() + "." + newPath, nil
}
} else if paths[0] == f.GetName() {
newPath, err := Expand(newRootPkg, newRootMsg, strings.Join(paths[1:], "."), descriptorSet)
if err != nil {
return "", err
}
return f.GetName() + "." + newPath, nil
}
} else if (len(paths) == 1) && (paths[0] == f.GetName()) {
return path, nil
}
}
if msg.IsExtendable() {
newRootPkg, f := descriptorSet.FindExtension(rootPkg, rootMsg, paths[0])
if f == nil {
return "", &errUndefined{rootPkg, rootMsg, path}
}
typeName := f.GetTypeName()
typeNames := strings.Split(typeName, ".")
newRootMsg := typeName
if len(typeNames) > 1 {
newRootMsg = typeNames[len(typeNames)-1]
}
if f.IsMessage() {
if gogoproto.IsEmbed(f) {
newPath, err := Expand(newRootPkg, newRootMsg, strings.Join(paths, "."), descriptorSet)
if err == nil {
return f.GetName() + "." + newPath, nil
}
} else {
newPath, err := Expand(newRootPkg, newRootMsg, strings.Join(paths[1:], "."), descriptorSet)
if err != nil {
return "", err
}
return f.GetName() + "." + newPath, nil
}
} else if (len(paths) == 1) && (paths[0] == f.GetName()) {
return path, nil
}
}
return "", &errUndefined{rootPkg, rootMsg, path}
}
//Collapses a proto fieldpath into a go fieldpath. They are different if some of the fields in the fieldpath have been embedded.
func Collapse(rootPkg string, rootMsg string, path string, descriptorSet *descriptor.FileDescriptorSet) (string, error) {
msg := descriptorSet.GetMessage(rootPkg, rootMsg)
if msg == nil {
return "", &errUndefined{rootPkg, rootMsg, path}
}
paths := strings.Split(path, ".")
if len(paths) == 0 {
return "", &errUndefined{rootPkg, rootMsg, path}
}
if len(paths) == 1 {
return path, nil
}
for _, f := range msg.GetField() {
if f.GetName() != paths[0] {
continue
}
if f.IsMessage() {
newRootPkg, newRootMsg := descriptorSet.FindMessage(rootPkg, rootMsg, f.GetName())
if len(newRootPkg) == 0 || len(newRootMsg) == 0 {
return "", &errUndefined{rootPkg, rootMsg, path}
}
newPath, err := Collapse(newRootPkg, newRootMsg, strings.Join(paths[1:], "."), descriptorSet)
if err != nil {
return "", err
}
if gogoproto.IsEmbed(f) {
return newPath, nil
} else {
return paths[0] + "." + newPath, nil
}
}
}
if msg.IsExtendable() {
newRootPkg, f := descriptorSet.FindExtension(rootPkg, rootMsg, paths[0])
if f == nil {
return "", &errUndefined{rootPkg, rootMsg, path}
}
typeName := f.GetTypeName()
typeNames := strings.Split(typeName, ".")
newRootMsg := typeName
if len(typeNames) > 1 {
newRootMsg = typeNames[len(typeNames)-1]
}
newPath, err := Collapse(newRootPkg, newRootMsg, strings.Join(paths[1:], "."), descriptorSet)
if err != nil {
return "", err
}
if gogoproto.IsEmbed(f) {
return newPath, nil
} else {
return paths[0] + "." + newPath, nil
}
}
return "", nil
}
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