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YamlConfigurationFileParser.cs
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YamlConfigurationFileParser.cs
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using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using YamlDotNet.RepresentationModel;
namespace Orchard.Parser.Yaml
{
public class YamlConfigurationFileParser
{
private readonly IDictionary<string, string> _data = new SortedDictionary<string, string>(StringComparer.OrdinalIgnoreCase);
private readonly Stack<string> _context = new Stack<string>();
private string _currentPath;
public IDictionary<string, string> Parse(Stream stream)
{
var data = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
var yamlConfig = new YamlStream();
yamlConfig.Load(new StreamReader(stream));
var mapping =
(YamlMappingNode)yamlConfig.Documents[0].RootNode;
VisitYamlMappingNode(mapping);
return _data;
}
private void VisitYamlMappingNode(YamlMappingNode yamlNode)
{
foreach (var entry in yamlNode.Children)
{
VisitYamlNode(entry);
}
}
private void VisitYamlSequenceNode(YamlSequenceNode yamlNode)
{
foreach (var entry in yamlNode.Children)
{
if (entry is YamlMappingNode)
VisitYamlMappingNode((YamlMappingNode)entry);
}
}
private void VisitYamlNode(KeyValuePair<YamlNode, YamlNode> node)
{
if (node.Value is YamlScalarNode)
VisitYamlScalarNode((YamlScalarNode)node.Key, (YamlScalarNode)node.Value);
if (node.Value is YamlMappingNode)
VisitYamlMappingNode((YamlScalarNode)node.Key, (YamlMappingNode)node.Value);
if (node.Value is YamlSequenceNode)
VisitYamlSequenceNode((YamlScalarNode)node.Key, (YamlSequenceNode)node.Value);
}
private void VisitYamlMappingNode(YamlScalarNode yamlNodeKey, YamlMappingNode yamlNodeValue)
{
EnterContext(yamlNodeKey.Value);
VisitYamlMappingNode(yamlNodeValue);
ExitContext();
}
private void VisitYamlSequenceNode(YamlScalarNode yamlNodeKey, YamlSequenceNode yamlNodeValue)
{
EnterContext(yamlNodeKey.Value);
VisitYamlSequenceNode(yamlNodeValue);
ExitContext();
}
private void VisitYamlScalarNode(YamlScalarNode yamlNodeKey, YamlScalarNode yamlNodeValue)
{
EnterContext(yamlNodeKey.Value);
var key = _currentPath;
if (_data.ContainsKey(key))
{
throw new FormatException(string.Format("FormatError_KeyIsDuplicated({0})", key));
}
_data[key] = yamlNodeValue.Value;
ExitContext();
}
private void EnterContext(string context)
{
_context.Push(context);
_currentPath = string.Join(ConfigurationPath.KeyDelimiter, _context.Reverse());
}
private void ExitContext()
{
_context.Pop();
_currentPath = string.Join(ConfigurationPath.KeyDelimiter, _context.Reverse());
}
}
}