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/*
* Open Chinese Convert
*
* Copyright 2010-2026 Carbo Kuo and contributors
*
* 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.
*/
#pragma once
#include <utility>
#include <vector>
#include "Converter.hpp"
namespace opencc {
/**
* A @c Converter that passes text through a sequence of @c Converter stages
* in order, feeding the output of each stage as input to the next.
*
* This enables multi-step conversion schemes where different segmentation
* strategies or dictionary sets are needed at each step. For example, the
* @c s2twp config first converts Simplified to Traditional (stage 1) and then
* applies Taiwan-specific phrase substitution (stage 2).
*
* @note @c GetConversionChain() always returns @c nullptr because a pipeline
* has no single chain. @c GetSegmentation() returns the last stage's
* segmentation as a best-effort representative.
*
* @ingroup opencc_cpp_api
*/
class OPENCC_EXPORT PipelineConverter : public Converter {
public:
/** @param stages Ordered list of converters to apply in sequence. */
explicit PipelineConverter(std::vector<ConverterPtr> stages)
: stages(std::move(stages)) {}
std::string Convert(std::string_view text) const override;
/**
* Returns an inspection result with @c input and @c output populated.
* Per-stage segment detail is not available at the pipeline level.
*/
ConversionInspectionResult Inspect(std::string_view text) const override;
/** Returns the last stage's segmentation, or @c nullptr for an empty pipeline. */
SegmentationPtr GetSegmentation() const override;
/** Always returns @c nullptr; a pipeline has no single conversion chain. */
ConversionChainPtr GetConversionChain() const override { return nullptr; }
private:
const std::vector<ConverterPtr> stages;
};
} // namespace opencc