123 lines
3.3 KiB
C++
Executable file
123 lines
3.3 KiB
C++
Executable file
/*
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* Copyright (C) 2021 Duowan Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __X_PACK_YAML_DECODER_H
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#define __X_PACK_YAML_DECODER_H
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#include "yaml-cpp/yaml.h"
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#include "xdecoder.h"
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namespace xpack {
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class YamlNode {
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typedef XDecoder<YamlNode> decoder;
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public:
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typedef YAML::const_iterator Iterator;
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YamlNode(const YAML::Node& node):n(node),valid(true){}
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YamlNode():valid(false){}
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inline static const char * Name() {
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return "yaml";
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}
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operator bool() const {
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return valid;
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}
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bool IsNull() const {
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return valid && n.IsNull();
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}
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YamlNode Find(decoder&de, const char*key, const Extend *ext) const {
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(void)ext;
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if (n.IsNull()) {
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return YamlNode();
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} else if (!n.IsMap()) {
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de.decode_exception("not map", NULL);
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}
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return YamlNode(n[key]);
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}
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size_t Size(decoder&de) const {
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if (!n.IsSequence()) {
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de.decode_exception("not sequence", NULL);
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}
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return (size_t)n.size();
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}
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YamlNode At(size_t index) const { // no exception
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return YamlNode(n[index]);
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}
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YamlNode Next(decoder&de, const YamlNode&parent, Iterator&iter, std::string&key) const {
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if (parent.n.IsMap()) {
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if ((void*)this != (void*)(&parent)) {
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++iter;
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} else {
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iter = parent.n.begin();
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}
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if (iter != parent.n.end()) {
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key = iter->first.as<std::string>();
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return YamlNode(iter->second);
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}
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} else {
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de.decode_exception("not map", NULL);
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}
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return YamlNode();
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}
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template <class T>
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bool Get(decoder&de, T &val, const Extend*ext){
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(void)de;
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(void)ext;
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try {
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val = n.as<T>();
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return true;
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} catch (const std::exception&e) {
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de.decode_exception(e.what(), NULL);
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} catch (...) {
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de.decode_exception("type unmatch", NULL);
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}
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return false;
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}
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private:
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YAML::Node n;
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bool valid;
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};
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class YamlDecoder {
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public:
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template <class T>
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bool decode(const std::string&str, T&val) {
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YAML::Node n = YAML::Load(str);
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if (n) {
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YamlNode node(n);
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return XDecoder<YamlNode>(NULL, (const char*)NULL, node).decode(val, NULL);
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}
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return false;
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}
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template <class T>
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bool decode_file(const std::string&fname, T&val) {
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YAML::Node n = YAML::LoadFile(fname);
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if (n) {
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YamlNode node(n);
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return XDecoder<YamlNode>(NULL, (const char*)NULL, node).decode(val, NULL);
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}
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return false;
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}
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};
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}
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#endif
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