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// Copyright 2020-2024 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 internal
import (
"bytes"
"unicode"
"unicode/utf8"
"google.golang.org/protobuf/reflect/protoreflect"
)
// JSONName returns the default JSON name for a field with the given name.
// This mirrors the algorithm in protoc:
//
// https://github.com/protocolbuffers/protobuf/blob/v21.3/src/google/protobuf/descriptor.cc#L95
func JSONName(name string) string {
var js []rune
nextUpper := false
for _, r := range name {
if r == '_' {
nextUpper = true
continue
}
if nextUpper {
nextUpper = false
js = append(js, unicode.ToUpper(r))
} else {
js = append(js, r)
}
}
return string(js)
}
// InitCap returns the given field name, but with the first letter capitalized.
func InitCap(name string) string {
r, sz := utf8.DecodeRuneInString(name)
return string(unicode.ToUpper(r)) + name[sz:]
}
// CreatePrefixList returns a list of package prefixes to search when resolving
// a symbol name. If the given package is blank, it returns only the empty
// string. If the given package contains only one token, e.g. "foo", it returns
// that token and the empty string, e.g. ["foo", ""]. Otherwise, it returns
// successively shorter prefixes of the package and then the empty string. For
// example, for a package named "foo.bar.baz" it will return the following list:
//
// ["foo.bar.baz", "foo.bar", "foo", ""]
func CreatePrefixList(pkg string) []string {
if pkg == "" {
return []string{""}
}
numDots := 0
// one pass to pre-allocate the returned slice
for i := 0; i < len(pkg); i++ {
if pkg[i] == '.' {
numDots++
}
}
if numDots == 0 {
return []string{pkg, ""}
}
prefixes := make([]string, numDots+2)
// second pass to fill in returned slice
for i := 0; i < len(pkg); i++ {
if pkg[i] == '.' {
prefixes[numDots] = pkg[:i]
numDots--
}
}
prefixes[0] = pkg
return prefixes
}
func WriteEscapedBytes(buf *bytes.Buffer, b []byte) {
// This uses the same algorithm as the protoc C++ code for escaping strings.
// The protoc C++ code in turn uses the abseil C++ library's CEscape function:
// https://github.com/abseil/abseil-cpp/blob/934f613818ffcb26c942dff4a80be9a4031c662c/absl/strings/escaping.cc#L406
for _, c := range b {
switch c {
case '\n':
buf.WriteString("\\n")
case '\r':
buf.WriteString("\\r")
case '\t':
buf.WriteString("\\t")
case '"':
buf.WriteString("\\\"")
case '\'':
buf.WriteString("\\'")
case '\\':
buf.WriteString("\\\\")
default:
if c >= 0x20 && c < 0x7f {
// simple printable characters
buf.WriteByte(c)
} else {
// use octal escape for all other values
buf.WriteRune('\\')
buf.WriteByte('0' + ((c >> 6) & 0x7))
buf.WriteByte('0' + ((c >> 3) & 0x7))
buf.WriteByte('0' + (c & 0x7))
}
}
}
}
// IsZeroLocation returns true if the given loc is a zero value
// (which is returned from queries that have no result).
func IsZeroLocation(loc protoreflect.SourceLocation) bool {
return loc.Path == nil &&
loc.StartLine == 0 &&
loc.StartColumn == 0 &&
loc.EndLine == 0 &&
loc.EndColumn == 0 &&
loc.LeadingDetachedComments == nil &&
loc.LeadingComments == "" &&
loc.TrailingComments == "" &&
loc.Next == 0
}
// ComputePath computes the source location path for the given descriptor.
// The boolean value indicates whether the result is valid. If the path
// cannot be computed for d, the function returns nil, false.
func ComputePath(d protoreflect.Descriptor) (protoreflect.SourcePath, bool) {
_, ok := d.(protoreflect.FileDescriptor)
if ok {
return nil, true
}
var path protoreflect.SourcePath
for {
p := d.Parent()
switch d := d.(type) {
case protoreflect.FileDescriptor:
return reverse(path), true
case protoreflect.MessageDescriptor:
path = append(path, int32(d.Index()))
switch p.(type) {
case protoreflect.FileDescriptor:
path = append(path, FileMessagesTag)
case protoreflect.MessageDescriptor:
path = append(path, MessageNestedMessagesTag)
default:
return nil, false
}
case protoreflect.FieldDescriptor:
path = append(path, int32(d.Index()))
switch p.(type) {
case protoreflect.FileDescriptor:
if d.IsExtension() {
path = append(path, FileExtensionsTag)
} else {
return nil, false
}
case protoreflect.MessageDescriptor:
if d.IsExtension() {
path = append(path, MessageExtensionsTag)
} else {
path = append(path, MessageFieldsTag)
}
default:
return nil, false
}
case protoreflect.OneofDescriptor:
path = append(path, int32(d.Index()))
if _, ok := p.(protoreflect.MessageDescriptor); ok {
path = append(path, MessageOneofsTag)
} else {
return nil, false
}
case protoreflect.EnumDescriptor:
path = append(path, int32(d.Index()))
switch p.(type) {
case protoreflect.FileDescriptor:
path = append(path, FileEnumsTag)
case protoreflect.MessageDescriptor:
path = append(path, MessageEnumsTag)
default:
return nil, false
}
case protoreflect.EnumValueDescriptor:
path = append(path, int32(d.Index()))
if _, ok := p.(protoreflect.EnumDescriptor); ok {
path = append(path, EnumValuesTag)
} else {
return nil, false
}
case protoreflect.ServiceDescriptor:
path = append(path, int32(d.Index()))
if _, ok := p.(protoreflect.FileDescriptor); ok {
path = append(path, FileServicesTag)
} else {
return nil, false
}
case protoreflect.MethodDescriptor:
path = append(path, int32(d.Index()))
if _, ok := p.(protoreflect.ServiceDescriptor); ok {
path = append(path, ServiceMethodsTag)
} else {
return nil, false
}
}
d = p
}
}
// CanPack returns true if a repeated field of the given kind
// can use packed encoding.
func CanPack(k protoreflect.Kind) bool {
switch k {
case protoreflect.MessageKind, protoreflect.GroupKind, protoreflect.StringKind, protoreflect.BytesKind:
return false
default:
return true
}
}
func ClonePath(path protoreflect.SourcePath) protoreflect.SourcePath {
clone := make(protoreflect.SourcePath, len(path))
copy(clone, path)
return clone
}
func reverse(p protoreflect.SourcePath) protoreflect.SourcePath {
for i, j := 0, len(p)-1; i < j; i, j = i+1, j-1 {
p[i], p[j] = p[j], p[i]
}
return p
}
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