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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// 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.
#ifndef GOOGLE_PROTOBUF_UTIL_CONVERTER_SNAKE2CAMEL_OBJECTWRITER_H__
#define GOOGLE_PROTOBUF_UTIL_CONVERTER_SNAKE2CAMEL_OBJECTWRITER_H__
#include <string>
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/stubs/stringpiece.h>
#include <google/protobuf/util/internal/object_writer.h>
#include <google/protobuf/util/internal/utility.h>
namespace google {
namespace protobuf {
namespace util {
namespace converter {
// Snake2CamelObjectWriter is an ObjectWriter than translates each field name
// from snake_case to camelCase. Typical usage is:
// ProtoStreamObjectSource psos(...);
// JsonObjectWriter jow(...);
// Snake2CamelObjectWriter snake_to_camel(&jow);
// psos.writeTo(&snake_to_camel);
class Snake2CamelObjectWriter : public ObjectWriter {
public:
explicit Snake2CamelObjectWriter(ObjectWriter* ow)
: ow_(ow), normalize_case_(true) {}
virtual ~Snake2CamelObjectWriter() {}
// ObjectWriter methods.
virtual Snake2CamelObjectWriter* StartObject(StringPiece name) {
ow_->StartObject(ShouldNormalizeCase(name)
? StringPiece(StringPiece(ToCamelCase(name)))
: name);
return this;
}
virtual Snake2CamelObjectWriter* EndObject() {
ow_->EndObject();
return this;
}
virtual Snake2CamelObjectWriter* StartList(StringPiece name) {
ow_->StartList(ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name))
: name);
return this;
}
virtual Snake2CamelObjectWriter* EndList() {
ow_->EndList();
return this;
}
virtual Snake2CamelObjectWriter* RenderBool(StringPiece name, bool value) {
ow_->RenderBool(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderInt32(StringPiece name, int32 value) {
ow_->RenderInt32(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderUint32(StringPiece name,
uint32 value) {
ow_->RenderUint32(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderInt64(StringPiece name, int64 value) {
ow_->RenderInt64(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderUint64(StringPiece name,
uint64 value) {
ow_->RenderUint64(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderDouble(StringPiece name,
double value) {
ow_->RenderDouble(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderFloat(StringPiece name, float value) {
ow_->RenderFloat(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderString(StringPiece name,
StringPiece value) {
ow_->RenderString(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderBytes(StringPiece name,
StringPiece value) {
ow_->RenderBytes(
ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name)) : name,
value);
return this;
}
virtual Snake2CamelObjectWriter* RenderNull(StringPiece name) {
ow_->RenderNull(ShouldNormalizeCase(name) ? StringPiece(ToCamelCase(name))
: name);
return this;
}
virtual Snake2CamelObjectWriter* DisableCaseNormalizationForNextKey() {
normalize_case_ = false;
return this;
}
private:
ObjectWriter* ow_;
bool normalize_case_;
bool ShouldNormalizeCase(StringPiece name) {
if (normalize_case_) {
return !IsCamel(name);
} else {
normalize_case_ = true;
return false;
}
}
bool IsCamel(StringPiece name) {
return name.empty() || (ascii_islower(name[0]) && !name.contains("_"));
}
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Snake2CamelObjectWriter);
};
} // namespace converter
} // namespace util
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_UTIL_CONVERTER_SNAKE2CAMEL_OBJECTWRITER_H__
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