fcb0ea001a
Introduce YamlParser as a helper to convert contents of a yaml file to a tree based structure for easier reading, and to avoid writing parser with raw yaml tokens. The class is based on libyaml, and only support reading but not writing a yaml file. The interface is inspired by Json::Value class from jsoncpp: http://jsoncpp.sourceforge.net/class_json_1_1_value.html Signed-off-by: Han-Lin Chen <hanlinchen@chromium.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
88 lines
1.6 KiB
C++
88 lines
1.6 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2022, Google Inc.
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*
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* yaml_parser.h - libcamera YAML parsing helper
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*/
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#pragma once
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#include <cstdio>
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#include <map>
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#include <string>
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#include <vector>
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#include <libcamera/base/class.h>
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#include <libcamera/geometry.h>
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namespace libcamera {
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class YamlParserContext;
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class YamlObject
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{
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public:
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YamlObject();
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~YamlObject();
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bool isValue() const
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{
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return type_ == Value;
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}
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bool isList() const
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{
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return type_ == List;
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}
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bool isDictionary() const
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{
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return type_ == Dictionary;
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}
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#ifndef __DOXYGEN__
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template<typename T,
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typename std::enable_if_t<
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std::is_same<bool, T>::value ||
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std::is_same<double, T>::value ||
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std::is_same<int32_t, T>::value ||
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std::is_same<uint32_t, T>::value ||
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std::is_same<std::string, T>::value ||
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std::is_same<Size, T>::value> * = nullptr>
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#else
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template<typename T>
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#endif
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T get(const T &defaultValue, bool *ok = nullptr) const;
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std::size_t size() const;
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const YamlObject &operator[](std::size_t index) const;
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bool contains(const std::string &key) const;
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const YamlObject &operator[](const std::string &key) const;
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std::vector<std::string> memberNames() const;
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private:
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LIBCAMERA_DISABLE_COPY_AND_MOVE(YamlObject)
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friend class YamlParserContext;
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enum Type {
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Dictionary,
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List,
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Value,
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};
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Type type_;
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std::string value_;
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std::vector<std::unique_ptr<YamlObject>> list_;
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std::map<const std::string, std::unique_ptr<YamlObject>> dictionary_;
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};
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class YamlParser final
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{
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public:
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static std::unique_ptr<YamlObject> parse(std::FILE *fh);
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};
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} /* namespace libcamera */
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