static void Main(string[] args)
{
using (TextReader input = File.OpenText(args[0]))
{
int indent = 0;
var parser = new Parser(input);
while(parser.MoveNext())
{
if (parser.Current is StreamEnd || parser.Current is DocumentEnd || parser.Current is SequenceEnd || parser.Current is SequenceEnd || parser.Current is MappingEnd)
{
--indent;
}
for(int i = 0; i < indent; ++i)
{
Console.Write(" ");
}
Console.WriteLine(parser.Current.ToString());
if (parser.Current is StreamStart || parser.Current is DocumentStart || parser.Current is SequenceStart || parser.Current is MappingStart)
{
++indent;
}
}
}
}
/// <summary>
/// Parse an entire YAML document as an instance of the given type.
/// Note that this method is not suitable to parse parts of a YAML document
/// because it throws an exception if the end of the stream has not been reached after parsing an instance of the given type.
/// </summary>
/// <typeparam name="T">The type to parse the YAML document as.</typeparam>
/// <param name="reader">A reader over the YAML data.</param>
/// <returns>The parsed instance.</returns>
public static T ParseDocument <T>(TextReader reader)
{
var parser = new SharpYaml.Parser(reader);
SkipStreamStart(parser);
var result = ObjectFromYaml <T>(parser);
CheckStreamEnd(parser);
return(result);
}
private static object FromYaml(string yamlText, bool expectOnlyFrontMatter, out TextPosition position)
{
position = new TextPosition();
if (yamlText == null)
{
return(null);
}
var parser = new Parser(new StringReader(yamlText));
var reader = new EventReader(parser);
if (!reader.Accept <StreamStart>())
{
return(null);
}
reader.Expect <StreamStart>();
var docStart = reader.Expect <DocumentStart>();
var hasDocumentStart = true;
object result = null;
ScriptArray objects = null;
// If we expect to read multiple documents, we will return an array of result
if (expectOnlyFrontMatter && docStart.IsImplicit)
{
return(null);
}
Mark endPosition;
while (true)
{
if (reader.Accept <StreamEnd>())
{
var evt = reader.Expect <StreamEnd>();
endPosition = evt.End;
break;
}
if (hasDocumentStart && reader.Accept <DocumentEnd>())
{
reader.Expect <DocumentEnd>();
hasDocumentStart = false;
if (expectOnlyFrontMatter)
{
reader.Accept <DocumentStart>();
var nextDocStart = reader.Expect <DocumentStart>();
endPosition = nextDocStart.End;
break;
}
continue;
}
if (reader.Accept <DocumentStart>())
{
reader.Expect <DocumentStart>();
hasDocumentStart = true;
}
var obj = ReadEvent(reader);
if (result == null)
{
result = obj;
}
else
{
if (objects == null)
{
objects = new ScriptArray {
result
};
result = objects;
}
objects.Add(obj);
}
}
position = new TextPosition(endPosition.Index, endPosition.Line, endPosition.Column);
return(result);
}
private static object FromYaml(string yamlText, string yamlFile, bool expectOnlyFrontMatter, out TextPosition position)
{
try
{
position = new TextPosition();
if (yamlText == null)
{
return(null);
}
var parser = new Parser(new StringReader(yamlText));
var reader = new EventReader(parser);
if (!reader.Accept <StreamStart>())
{
return(null);
}
reader.Expect <StreamStart>();
var docStart = reader.Expect <DocumentStart>();
var hasDocumentStart = true;
object result = null;
ScriptArray objects = null;
// If we expect to read multiple documents, we will return an array of result
if (expectOnlyFrontMatter && docStart.IsImplicit)
{
return(null);
}
Mark endPosition;
while (true)
{
if (reader.Accept <StreamEnd>())
{
var evt = reader.Expect <StreamEnd>();
endPosition = evt.End;
break;
}
if (hasDocumentStart && reader.Accept <DocumentEnd>())
{
reader.Expect <DocumentEnd>();
hasDocumentStart = false;
if (expectOnlyFrontMatter)
{
reader.Accept <DocumentStart>();
// Don't consume the token as the parser will try to parse
// the following characters and could hit non YAML syntax (in Markdown)
// and would throw a parser exception
var nextDocStart = reader.Peek <DocumentStart>();
endPosition = nextDocStart.End;
break;
}
continue;
}
if (reader.Accept <DocumentStart>())
{
reader.Expect <DocumentStart>();
hasDocumentStart = true;
}
var obj = ReadEvent(reader);
if (result == null)
{
result = obj;
}
else
{
if (objects == null)
{
objects = new ScriptArray {
result
};
result = objects;
}
objects.Add(obj);
}
}
position = new TextPosition(endPosition.Index, endPosition.Line, endPosition.Column);
return(result);
}
catch (Exception ex)
{
throw new LunetException($"Error while parsing {yamlFile}. {ex.Message}");
}
}